US20060108114A1 - Drilling method for maintaining productivity while eliminating perforating and gravel packing - Google Patents
Drilling method for maintaining productivity while eliminating perforating and gravel packing Download PDFInfo
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- US20060108114A1 US20060108114A1 US10/499,112 US49911204A US2006108114A1 US 20060108114 A1 US20060108114 A1 US 20060108114A1 US 49911204 A US49911204 A US 49911204A US 2006108114 A1 US2006108114 A1 US 2006108114A1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/082—Screens comprising porous materials, e.g. prepacked screens
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
Definitions
- This invention relates to a method of drilling and completing a well.
- this invention relates to a method for placing a means of communication between a productive formation and a well borehole without perforating and gravel packing the well borehole at sites of production.
- the method also relates to minimizing formation damage caused by conventional drilling, perforating, and gravel packing.
- the method combines and integrates elements of well drilling and construction with the well completion in a manner to reduce time, improve safety, and maximize productivity.
- One common method of well construction and completion is to drill a borehole with conventional drilling fluids, run casing into the borehole and cement the casing in place, displace the conventional drilling fluids with a clear brine, filter the brine and clean the borehole, run perforating guns in the well and perforate the casing, remove the perforating guns and re-clean the casing, re-filter to the clear brine fluids, run in the well with a gravel pack screen assembly, use high-pressure pumps place gravel pack sand between the gravel pack screen assembly into the perforation tunnels and against the formation face. This is a costly, time-consuming process.
- Formation damage is also a problem during conventional well construction and completion.
- Conventional drilling fluids can allow filtrate and solid particles to invade the formation causing restrictions in the productive pore spaces.
- Another source of formation damage is the shaped charges or explosives used in perforating. The energy from these explosives pushes the casing, cement, and formation aside when creating the perforation tunnel. This causes crushing of the formation matrix reducing the permeability and flow potential of the formation.
- Additional damage can come from the polymer gels used for controlling fluid losses after formation perforation.
- One method currently used to over come formation damage is hydraulic fracturing or frac packing. Frac packing is an attempt to use high-pressure pumping and hydraulic horse power to frac beyond any damage.
- Another method for formation damage mitigation uses acid stimulation to try and remove or dissolve formation damage caused by polymer gels or mud particle invasion. However, most mud weighting materials are solid mineral particles such as barite and bentonite that cannot be readily dissolved.
- the gravel pack assembly itself can serve as the restriction in the well borehole. This may cause unnecessary pressure drops which restrict production. Also, the gravel pack assembly may need to be removed for remedial operations. The process of removing an object from a well borehole is called fishing. These operations are costly and time consuming and not always successful resulting in a need to re-drill a portion of, or possibly the entire well.
- Drill-In-Fluids Another common method of well construction and completion is to drill a borehole and not run casing across the productive formation. This type of well construction is termed barefoot or openhole. Openhole completions are generally utilized after horizontal well construction. The most common practice is to run a screen assembly in the openhole section and not gravel pack on the outside of the screen between the screen and the formation. However, there has been an increasing number of openhole horizontal gravel packs performed. Formation damage is mitigated by the use of special drilling fluids termed “Drill-In-Fluids.” A common problem with this type of completion is the inability to isolate areas in the completion that produce water. Water production can increase to a point that limits hydrocarbon production rates.
- the screens run in the horizontal openhole generally contain a sand control filter media.
- the horizontal openhole section can act as a gravity separator during production. Because the unconsolidated formation material is not kept in place with gravel pack sand in the annulus between the screen and formation, it is free to move during production. The produced fluids having a certain velocity will carry smaller formation particles more easily and at a higher velocity than the larger formation particles.
- the filter media is usually designed on the midrange particle size based on the overall particle size distribution of the formation, the smaller formation particles tend to plug the screen's sand control filter media instead of bridging on the surface of the filter media with the larger formation particles. This plugging restricts the production potential of the well and may cause a workover or loss of hydrocarbon recovery from the reservoir.
- the present invention provides a method for drilling and completing a well, where the method achieves improved formation productivity without the need for well perforation and gravel packing.
- the present invention provides a method of well construction and completion including the steps of drilling an interval of a well into or into and through a productive formation in the presence of a fluid system adapted to control fluid loss, to be substantially non-damaging to the productive formation, and to form a filter cake having substantial flow back properties minimizing adverse affects on formation productivity.
- a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well.
- the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well.
- the members Once the members are deployed forming production conduits between an interior of the casing and the formation, the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- the present invention provides a method of well construction and completion including the steps of drilling an interval of a well into or into and through a productive formation in the presence of a fluid system characterized by having a hydrostatic pressure equal to or less than the formation pressure to minimize or eliminate the formation of a filter cake on the formation face, so called under balanced or near balanced drilling.
- a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well.
- the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well.
- the members Once the members are deployed forming production conduits between an interior of the casing and the formation, the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- the present invention provides a method of well construction and completion including the steps of drilling a first interval of a well through non-productive formations in the presence of a first fluid system.
- the first drilling fluid Prior to drilling into or into and through a productive formation, the first drilling fluid is replaced with a second fluid system adapted to control fluid loss, to be substantially non-damaging to the productive formation, and to form a filter cake having substantial flow back properties minimizing adverse affects on formation productivity.
- a second interval of the well is drilled into or into and through a productive formation in the presence of the second fluid system.
- a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well.
- the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well.
- the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- the present invention provides a method of well construction and completion including the steps of drilling a first interval of a well through non-productive formations in the presence of a first fluid system.
- the first drilling fluid Prior to drilling into or into and through a productive formation, the first drilling fluid is replaced with a second fluid system characterized by having a hydrostatic pressure equal to or less than the formation pressure to minimize or eliminate the formation of a filter cake on the formation face.
- a second interval of the well is drilled into or into and through a productive formation in the presence of the second fluid system, so called under balanced or near balanced drilling.
- a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well.
- the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well.
- the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- the methods of this invention can also include steps designed to remove or reduce the filter cake deposited on the formation face during the drilling operation by pumping a solvent into the well for a time sufficient to remove some or substantially all of the filter pack.
- the filter pack removal step can occur before or after member extension or before or after well cementing.
- the present invention further provides a completed well including a casing string including at least one and preferably a plurality of extended members having a sand control medium associated therewith, where the members extend out from the casing and contact sites in a productive formation forming production conduits through which formation fluid flow into an interior of the casing and out of the well.
- the member includes a casing fitting, an inner sleeve having inner sleeve stops and an outer sleeve having outer sleeve stops, where the sleeves are movable from a retracted state to an extended state when a sufficient hydraulic pressure is applied to the members.
- FIG. 1 is a schematic illustrating drilling a well to a point above the anticipated productive formations
- FIG. 2 depicts a schematic illustrating drilling through a productive formation with a “Drill-In Fluid” including a logging while drilling tool which can be used to determine the depth and length of productive formations;
- FIG. 3 depicts a schematic illustrating the benefits of using a “drill-in-fluid” drilling fluid vs. a conventional drilling fluid;
- FIG. 4 depicts a schematic illustrating running the extendable devices on the casing and positioning them across from the productive formation
- FIG. 5 depicts a schematic illustrating extending the devices to contact the formation face and centralize the casing
- FIG. 6 illustrates the casing been cemented into place
- FIG. 7 depicts a schematic illustrating the well in a producing mode.
- a casing including at least one, but preferably a plurality of extendable members adapted to form production conduits between a productive formation and an interior of the casing.
- the members are hydraulically extendable from a retracted stated to an intended state and include a casing fitting, an inner sleeve, inner sleeve stops, an outer sleeve and outer sleeve stops, where the sleeve are movable between the retracted state and the extended state to form a telescoping conduit.
- a distal end of the member is designed to contact a site on a face of a productive formation, where the contact is sufficient to allow fluid flow from the formation through an interior of the extended member and into an interior of the casing.
- This invention broadly relates to methods for drilling and completing a well including the step of drilling a productive interval of a well with a fluid system selected from the group consisting of a fluid system adapted to control fluid loss, to be substantially non-damaging to the productive formation, and to form a filter cake having substantial flow back properties minimizing adverse affects on formation productivity, a fluid system characterized by having a hydrostatic pressure equal to or less than the formation pressure to minimize or eliminate the formation of a filter cake on the formation face and mixtures or combinations thereof.
- casing including at least one and preferably a plurality of extendable members having a sand control medium associated therewith is run into the well so that the extendable members are positioned and aligned within the productive formation so that when extended the member form production conduits between sites of the productive formation and an interior of the casing.
- the member are extended hydraulically to form the conduits and the casing is cemented in place.
- cementing of the casing can proceed extending of the member to form permeable elements or production conduits.
- the present invention also broadly relates to a completed oil and/or gas well including a casing having at least one, but preferably a plurality of, extendable member formed within sections of the casing, where the sections of the casing are positioned in productive formation so that the extendable members can form production conduits or permeable elements at desired sites within the productive formation once extended.
- the present invention also broadly relates to a producing oil and/or gas well including a casing having at least one, but preferably a plurality of, extendable member formed within sections of the casing, where the sections of the casing are positioned in productive formation and where the extendable members are extended to form production conduits or permeable elements at desired sites within the productive formation.
- the extendable members include a casing fitting adapted to secure the member to a portion of the wall of a casing section, an inner sleeve, an inner sleeve stop, an outer sleeve, an outer sleeve stop and a sand control medium disposed in a distal section of an interior of the inner sleeve, where the sleeves are designed to move from a retracted state to an extended state to form a telescoping conduit and a distal end is designed to contact a site of a productive formation forming a production conduit with the sand control medium interposed between the formation and an inner of the casing.
- the productive formations can be identified during well construction by utilizing logging while drilling tools or openhole electric logs. These tools identify the productive formations depth and thickness of the productive formations.
- the extendable members which will replace the perforation and gravel pack completion are spaced out on the casing string to allow them to be aligned with the productive formations as determine by the well logs. Depending on the expected productivity of the formation generally between 1 and 12 extendable members per foot may be required to effectively drain a reservoir. In many cases 4 extendable members per foot will be adequate.
- the casing is then run into the borehole such that the extendable members are positioned opposite the productive formation.
- the extendable members are extended mechanically, or hydraulically or a combination of mechanical and hydraulic means. This allows the devices to come in contact with the filter cake and formation face.
- the devices will help centralize the casing in the borehole.
- the casing is then cemented.
- the production tubing/equipment is then run into the well.
- the well may be placed on production or solvents pumped to remove the filter cake. If the well has been drilled in an under balanced or near balanced condition, there should be little if any filter cake to remove.
- Suitable fluid systems for using in drilling the intervals of a well that penetration into or into and through a productive formation include, without limitation, any fluid system comprises a fluid carrier and particles, where the particles have a particle size distribution for forming a low permeability filter cake on a formation face as the well is drilled and where the particle size distribution is designed so that a majority of the particles in the filter cake flow back into the casing through a sand control filter medium associated with the extendable members and minimizing adverse affects on formation productivity.
- One such fluid system for drilling the productive formation is disclosed in U.S. Pat. No. 5,504,062 to Johnson, incorporated herein by reference. Those skilled in the art will recognize that these types of fluid systems have the ability to minimize filtrate and particle invasion into the formation.
- Pat. No. 5,504,062 also disclosed, a formulation of particle sizes that protect the formation and flow back through conventional gravel pack media with minimal damage to the production potential of a formation.
- These fluids have been designed for use in openhole well construction; more particularly they are used for openhole horizontal drilling.
- Other fluid systems are disclosed U.S. Pat. Nos. 4,620,596, 4,369,843; and 4,186,803 to Mondshine, incorporated herein by reference.
- the fluid system includes sized salt particles; which protect the formation during well construction and workover operations.
- the fluids disclosed by Mondshine have been applied as drilling fluids in horizontal openhole well construction.
- a subsea blowout preventer stack 3 may be positioned on an ocean floor 3 a in offshore application.
- the well casing string 45 includes a conductor elements 4 , a surface element 5 , and an intermediate element 6 .
- the casing string is placed in boreholes and then cemented in place.
- drilling of a well borehole 50 is continued to a target reservoir 16 .
- the drilling assembly 55 includes of a drill string 7 , logging while drilling formation evaluation sensors 8 , a drilling motor 9 , a drill string stabilizer 10 , and a drill bit 11 .
- the bottom hole assembly 12 includes the logging while drilling formation evaluation sensors 8 , the drilling motor 9 , the drill string stabilizer 10 , and the drill bit 11 .
- the bottom hole assembly 12 has intersected a marker formation 15 .
- the marker formation 5 is a selected geological indicator that is reached prior to the borehole 50 intersecting the target formation 16 .
- the marker formation 15 provides an indication of the additional drilling depth needed drill from a current bottom hole position 14 to the target formation 16 .
- conventional drilling mud is displaced with a “Drill-In Fluid” selected to protect the formation in the target reservoir 16 during drilling into or into and through the target formation 16 .
- the “Drill-In Fluid” displaces the conventional mud by pumping the “Drill-In Fluid” into the drill string 7 pushing the conventional drilling fluid out of the borehole 45 via return up an annulus space 13 .
- drilling of the borehole 50 is continued and extended into or into and through the target reservoir 16 using the “Drill-In Fluid”.
- the bottom of the well 14 is now shown extended through the target reservoir 16 .
- the target reservoir 16 has a formation matrix 27 including solid particles 18 and pore spaces 17 .
- the pore spaces 17 are the area in the formation that generally contains oil, gas, and/or water.
- FIG. 3B an example of what can happen to a formation matrix 28 is graphically depicted if a conventional drilling fluid is used to drill into and through the target reservoir or formation 16 .
- a filter cake 19 has been formed from on a face 28 a of the matrix 28 and mud filtrate and solid particles have invaded the pore spaces 17 which can cause a reduction in well productivity.
- a formation matrix 29 is shown depicting the use of a “Drill-In Fluid” for drilling within the target reservoir 16 , which forms a filter cake 20 with little or no invasion of particulate into the pore spaces 17 protecting the formation matrix 29 . This type of fluid will minimize any negative effects on productivity.
- the drill string 7 and bottom hole assembly 12 are pulled from the borehole 45 .
- Casing is run into the well.
- the casing will have extendable members positioned such that when the casing reaches the bottom of the borehole 14 the extendable members are positioned and aligned with sites in the target reservoir 16 .
- FIG. 4 a section 21 of the target formation or reservoir 16 is depicted showing an adjacent portion 22 a of a casing 22 having an extendable member 23 aligned adjacent a site 21 a of the section 21 of the target reservoir 16 .
- FIG. 4 shows only a single member 23
- a plurality of members 23 can be associated with sections of the casing in a spaced apart configuration to provide a plurality of production conduits within the target reservoir 16 depending on the production requirements of the reservoir 16 .
- four extendable members per foot of formation are used to provide an adequate number of production conduits for most formations within producing hydrocarbon reservoirs.
- lesser and greater number of extendable members can be used as well depending on the desired production level.
- the number of extendable members will be between 1 per foot of formation to about 20 per foot, with between 2 and 10 being preferred and between 3 and 8 being particularly preferred.
- an extendable member 23 is shown in its run position or retracted state.
- the extendable member 23 includes an inner sleeve 30 having an inner sleeve lip 31 , an interior 32 , a sand control medium 33 disposed in a distal end portion 34 of the interior 32 , an outer sleeve 35 having an inner sleeve stop 36 and an outer sleeve lip 37 and a fitting 38 having an outer sleeve stop 39 , where the fitting 38 is adapted to attach the member 23 to the casing 22 .
- the annulus 13 may be filled at this point with “Drill-In Fluid” or the “Drill-In Fluid” displaced with a solids free fluid.
- a filter cake 20 protects a face 21 b of the formation section 21 .
- the expendable member 23 is shown in its extended state, where hydraulic pressure has been used to force a distal end 40 of the member 23 in contact with a portion 25 of the filter cake 20 associated with the site 21 a of the section 21 of the formation 16 .
- the well is now ready to be cemented.
- the annulus 13 is shown filled with a cement 24 isolating the section 21 of the formation 16 , except for flow control points associated with the extendable members 23 . At this point production tubing/equipment is run into the well and the well made ready for production.
- the formation section 21 is shown producing through an interior 32 of the extendable member 23 .
- fluid 26 produced from formation section 21 has removed the portion 25 of the filter cake 20 in the area constrained by the extendable member 23 .
- the produce fluids 26 travel through the interior 32 of the extendable member 23 into an interior 22 b of the casing 22 .
- the produced fluids 26 continue up the casing 22 and eventually enter the production tubing. They produced fluids 26 which may contain oil, gas, and/or water flow to the surface via the production tubing for processing and/or sale. Should production not reach expected levels quickly enough a solvent may be used to facilitate filter cake removal.
Abstract
A method for well construction and completion is disclosed. First, a productive section of a well is drilled in the presence of a fluid system that controls fluid losses, is substantially non-damaging to the formation and includes particles in a particle size distribution sufficient to form a low permeability filter cake on a formation face and to allow the majority of the filter cake particles to flow back into the borehole after well completion. after drilling, a casing includes at least one and preferably a plurality of extendable permeable elements or member is run in the well so that the elements are positioned and aligned with sites in the producing formation and once extended form production conduits between the formation and an interior of the casing. A completed borehole is also disclosed including a casing having production conduits formed from the extendable members or elements.
Description
- 1. Field of the Invention
- This invention relates to a method of drilling and completing a well.
- More particularly, this invention relates to a method for placing a means of communication between a productive formation and a well borehole without perforating and gravel packing the well borehole at sites of production. The method also relates to minimizing formation damage caused by conventional drilling, perforating, and gravel packing. The method combines and integrates elements of well drilling and construction with the well completion in a manner to reduce time, improve safety, and maximize productivity.
- 2. Description of the Related Art
- The search for oil and gas reserves has taken the industry to remote sites including land, traditional offshore locations, and offshore deepwater. Historically the cost for exploring and developing hydrocarbons has been very high, and as the search for hydrocarbons continues in more remote areas costs are escalating because of the amount of equipment and personnel required in these areas. Because of the escalating cost it is important, that formation damage be minimized. Formation damage can negatively affect productivity of the resulting wells. Productivity needs to be as high as possible in order to ensure profitability. Also, it is important to seek ways to reduce the time spent on well construction and completion operations to minimize cost and if the number of personnel and the amount of equipment can be reduced safety inherently improves.
- Many hydrocarbon reservoirs are by their very nature unconsolidated rock and/or sandstone. These unconsolidated formations may produce sand particles and other debris which can cause well bore and surface facility problems as well as negatively affecting the productivity of the well. Therefore, means of preventing sand production have been developed throughout the years.
- One common method of well construction and completion is to drill a borehole with conventional drilling fluids, run casing into the borehole and cement the casing in place, displace the conventional drilling fluids with a clear brine, filter the brine and clean the borehole, run perforating guns in the well and perforate the casing, remove the perforating guns and re-clean the casing, re-filter to the clear brine fluids, run in the well with a gravel pack screen assembly, use high-pressure pumps place gravel pack sand between the gravel pack screen assembly into the perforation tunnels and against the formation face. This is a costly, time-consuming process.
- There are many disadvantages from the above procedure. These disadvantages can be broken into two categories; equipment and process reliability, and formation damage mitigation or removal. Fluid losses of the filtered brine can occur after perforating necessitating the need for a means of fluid loss control which generally entails pumping high viscosity polymer gel into the formation. There have been instances where leaks have caused perforating guns to low order detonate resulting in no or poor perforating performance and expensive fishing operations to remove the damaged perforating gun bodies. Also, gravel pack screens have failed during the high-pressure pumping operation causing additional fishing operations or worse the damage isn't discover until the well is placed on production necessitating a workover of the well.
- Formation damage is also a problem during conventional well construction and completion. Conventional drilling fluids can allow filtrate and solid particles to invade the formation causing restrictions in the productive pore spaces. Another source of formation damage is the shaped charges or explosives used in perforating. The energy from these explosives pushes the casing, cement, and formation aside when creating the perforation tunnel. This causes crushing of the formation matrix reducing the permeability and flow potential of the formation. Additional damage can come from the polymer gels used for controlling fluid losses after formation perforation. One method currently used to over come formation damage is hydraulic fracturing or frac packing. Frac packing is an attempt to use high-pressure pumping and hydraulic horse power to frac beyond any damage. Another method for formation damage mitigation uses acid stimulation to try and remove or dissolve formation damage caused by polymer gels or mud particle invasion. However, most mud weighting materials are solid mineral particles such as barite and bentonite that cannot be readily dissolved.
- The gravel pack assembly itself can serve as the restriction in the well borehole. This may cause unnecessary pressure drops which restrict production. Also, the gravel pack assembly may need to be removed for remedial operations. The process of removing an object from a well borehole is called fishing. These operations are costly and time consuming and not always successful resulting in a need to re-drill a portion of, or possibly the entire well.
- Another common method of well construction and completion is to drill a borehole and not run casing across the productive formation. This type of well construction is termed barefoot or openhole. Openhole completions are generally utilized after horizontal well construction. The most common practice is to run a screen assembly in the openhole section and not gravel pack on the outside of the screen between the screen and the formation. However, there has been an increasing number of openhole horizontal gravel packs performed. Formation damage is mitigated by the use of special drilling fluids termed “Drill-In-Fluids.” A common problem with this type of completion is the inability to isolate areas in the completion that produce water. Water production can increase to a point that limits hydrocarbon production rates. Isolating and stopping areas of water production is made extremely difficult due to not having cemented casing in-place to help control the flow of water in the annulus between the screen and the formation. Also, the screens run in the horizontal openhole generally contain a sand control filter media. The horizontal openhole section can act as a gravity separator during production. Because the unconsolidated formation material is not kept in place with gravel pack sand in the annulus between the screen and formation, it is free to move during production. The produced fluids having a certain velocity will carry smaller formation particles more easily and at a higher velocity than the larger formation particles. Because the filter media is usually designed on the midrange particle size based on the overall particle size distribution of the formation, the smaller formation particles tend to plug the screen's sand control filter media instead of bridging on the surface of the filter media with the larger formation particles. This plugging restricts the production potential of the well and may cause a workover or loss of hydrocarbon recovery from the reservoir.
- Attempts to introduce devices which eliminate perforating and gravel packing are not new and have been disclosed in the past. Zandmer in U.S. Pat. No. 3,347,317 disclosed an extendable duct with solid particles acting as a gravel pack medium. Johnson disclosed an extendable device in PCT application publication number WO9626350. These devices have not been widely used. These devices trap drilling mud filter cake between the sand control filter media and formation face which limit productivity due to plugging of the formation and filter media The drilling fluids used in the well construction process generally contain minerals such as barite, bentonite, and/or clays in the form of solid particles. These particles form a filter cake on the formation face as the well is drilled. These filter cakes have a leak off rate which allows filtrate and smaller particles to enter the pore spaces of the formation and can cause considerable damage to a formation's productivity. The same filter cake can plug the sand control filter media utilized in the devices described above. In another invention disclosed by Reinhardt in U.S. Pat. No. 5,425,424, no gravel pack median is used in these extendable ducts. However, productivity is maximized by performing a hydraulic fracture treatment after extending the perforation ducts. Hydraulic fracturing is a method of bypassing formation damage and/or improving conductivity between the productive formation and the well borehole.
- Therefore, there is a need for a method of well construction and completion that minimizes formation damage, maximizes well productivity, and provides a means of formation isolation. Further, there is a need for a method that minimizes time spent during well completion and that improves process reliability and safety. For cased and cemented wells, there is a further need to integrate well construction and completion processes eliminating well perforation and gravel packing operations, while maximizing formation productivity. The present invention answers these needs in a cross disciplined integration of well construction (drilling) and completion processes to maximize formation productivity.
- The present invention provides a method for drilling and completing a well, where the method achieves improved formation productivity without the need for well perforation and gravel packing.
- The present invention provides a method of well construction and completion including the steps of drilling an interval of a well into or into and through a productive formation in the presence of a fluid system adapted to control fluid loss, to be substantially non-damaging to the productive formation, and to form a filter cake having substantial flow back properties minimizing adverse affects on formation productivity. After the productive interval is drilled, a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well. After the casing has been properly run into the well, the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well. Once the members are deployed forming production conduits between an interior of the casing and the formation, the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- The present invention provides a method of well construction and completion including the steps of drilling an interval of a well into or into and through a productive formation in the presence of a fluid system characterized by having a hydrostatic pressure equal to or less than the formation pressure to minimize or eliminate the formation of a filter cake on the formation face, so called under balanced or near balanced drilling. After the productive interval is drilled, a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well. After the casing has been properly run into the well, the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well. Once the members are deployed forming production conduits between an interior of the casing and the formation, the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- The present invention provides a method of well construction and completion including the steps of drilling a first interval of a well through non-productive formations in the presence of a first fluid system. Prior to drilling into or into and through a productive formation, the first drilling fluid is replaced with a second fluid system adapted to control fluid loss, to be substantially non-damaging to the productive formation, and to form a filter cake having substantial flow back properties minimizing adverse affects on formation productivity. After fluid system replacement, a second interval of the well is drilled into or into and through a productive formation in the presence of the second fluid system. After the productive interval is drilled, a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well. After the casing has been properly run into the well, the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well. Once the members are deployed forming production conduits between an interior of the casing and the formation, the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- The present invention provides a method of well construction and completion including the steps of drilling a first interval of a well through non-productive formations in the presence of a first fluid system. Prior to drilling into or into and through a productive formation, the first drilling fluid is replaced with a second fluid system characterized by having a hydrostatic pressure equal to or less than the formation pressure to minimize or eliminate the formation of a filter cake on the formation face. After fluid system replacement, a second interval of the well is drilled into or into and through a productive formation in the presence of the second fluid system, so called under balanced or near balanced drilling. After the productive interval is drilled, a casing string including at least one and preferably a plurality of laterally extendable members having a sand control medium associated therewith is run into the well so that the members can be deployed to contact sites in the productive interval, i.e., the extendable members are positioned and aligned within the productive formation interval of the well. After the casing has been properly run into the well, the members are extended such that each member comes into contact with the filter cake and/or the productive formation at their associated sites, where the contacting in sufficient to allow productive formation fluids to flow through the member into the casing and out of the well. Once the members are deployed forming production conduits between an interior of the casing and the formation, the casing is cemented in place. After casing cementing, production tubing/equipment is run into the well borehole and the well is placed on production.
- The methods of this invention can also include steps designed to remove or reduce the filter cake deposited on the formation face during the drilling operation by pumping a solvent into the well for a time sufficient to remove some or substantially all of the filter pack. The filter pack removal step can occur before or after member extension or before or after well cementing.
- The present invention further provides a completed well including a casing string including at least one and preferably a plurality of extended members having a sand control medium associated therewith, where the members extend out from the casing and contact sites in a productive formation forming production conduits through which formation fluid flow into an interior of the casing and out of the well. The member includes a casing fitting, an inner sleeve having inner sleeve stops and an outer sleeve having outer sleeve stops, where the sleeves are movable from a retracted state to an extended state when a sufficient hydraulic pressure is applied to the members.
- The invention can be better understood with reference to the following detailed description together with the appended illustrative drawings in which like elements are numbered the same:
-
FIG. 1 is a schematic illustrating drilling a well to a point above the anticipated productive formations; -
FIG. 2 depicts a schematic illustrating drilling through a productive formation with a “Drill-In Fluid” including a logging while drilling tool which can be used to determine the depth and length of productive formations; -
FIG. 3 depicts a schematic illustrating the benefits of using a “drill-in-fluid” drilling fluid vs. a conventional drilling fluid; -
FIG. 4 depicts a schematic illustrating running the extendable devices on the casing and positioning them across from the productive formation; -
FIG. 5 depicts a schematic illustrating extending the devices to contact the formation face and centralize the casing; -
FIG. 6 illustrates the casing been cemented into place; and -
FIG. 7 depicts a schematic illustrating the well in a producing mode. - The inventor has found that an oil and/or gas well can be drilled and completed without the need for formation perforation and gravel packing using a casing including at least one, but preferably a plurality of extendable members adapted to form production conduits between a productive formation and an interior of the casing. The members are hydraulically extendable from a retracted stated to an intended state and include a casing fitting, an inner sleeve, inner sleeve stops, an outer sleeve and outer sleeve stops, where the sleeve are movable between the retracted state and the extended state to form a telescoping conduit. In the extended state a distal end of the member is designed to contact a site on a face of a productive formation, where the contact is sufficient to allow fluid flow from the formation through an interior of the extended member and into an interior of the casing.
- This invention broadly relates to methods for drilling and completing a well including the step of drilling a productive interval of a well with a fluid system selected from the group consisting of a fluid system adapted to control fluid loss, to be substantially non-damaging to the productive formation, and to form a filter cake having substantial flow back properties minimizing adverse affects on formation productivity, a fluid system characterized by having a hydrostatic pressure equal to or less than the formation pressure to minimize or eliminate the formation of a filter cake on the formation face and mixtures or combinations thereof. After drilling into or into and through the productive formation, casing including at least one and preferably a plurality of extendable members having a sand control medium associated therewith is run into the well so that the extendable members are positioned and aligned within the productive formation so that when extended the member form production conduits between sites of the productive formation and an interior of the casing. After proper casing positioning, the member are extended hydraulically to form the conduits and the casing is cemented in place. After cementing, the well can be placed on production. Alternatively, cementing of the casing can proceed extending of the member to form permeable elements or production conduits.
- The present invention also broadly relates to a completed oil and/or gas well including a casing having at least one, but preferably a plurality of, extendable member formed within sections of the casing, where the sections of the casing are positioned in productive formation so that the extendable members can form production conduits or permeable elements at desired sites within the productive formation once extended. The present invention also broadly relates to a producing oil and/or gas well including a casing having at least one, but preferably a plurality of, extendable member formed within sections of the casing, where the sections of the casing are positioned in productive formation and where the extendable members are extended to form production conduits or permeable elements at desired sites within the productive formation. The extendable members include a casing fitting adapted to secure the member to a portion of the wall of a casing section, an inner sleeve, an inner sleeve stop, an outer sleeve, an outer sleeve stop and a sand control medium disposed in a distal section of an interior of the inner sleeve, where the sleeves are designed to move from a retracted state to an extended state to form a telescoping conduit and a distal end is designed to contact a site of a productive formation forming a production conduit with the sand control medium interposed between the formation and an inner of the casing.
- The productive formations can be identified during well construction by utilizing logging while drilling tools or openhole electric logs. These tools identify the productive formations depth and thickness of the productive formations. The extendable members which will replace the perforation and gravel pack completion are spaced out on the casing string to allow them to be aligned with the productive formations as determine by the well logs. Depending on the expected productivity of the formation generally between 1 and 12 extendable members per foot may be required to effectively drain a reservoir. In
many cases 4 extendable members per foot will be adequate. The casing is then run into the borehole such that the extendable members are positioned opposite the productive formation. The extendable members are extended mechanically, or hydraulically or a combination of mechanical and hydraulic means. This allows the devices to come in contact with the filter cake and formation face. Also, the devices will help centralize the casing in the borehole. The casing is then cemented. The production tubing/equipment is then run into the well. Depending on the type of “Drill-In Fluid” used in the drilling process, the well may be placed on production or solvents pumped to remove the filter cake. If the well has been drilled in an under balanced or near balanced condition, there should be little if any filter cake to remove. - Suitable fluid systems for using in drilling the intervals of a well that penetration into or into and through a productive formation include, without limitation, any fluid system comprises a fluid carrier and particles, where the particles have a particle size distribution for forming a low permeability filter cake on a formation face as the well is drilled and where the particle size distribution is designed so that a majority of the particles in the filter cake flow back into the casing through a sand control filter medium associated with the extendable members and minimizing adverse affects on formation productivity. One such fluid system for drilling the productive formation is disclosed in U.S. Pat. No. 5,504,062 to Johnson, incorporated herein by reference. Those skilled in the art will recognize that these types of fluid systems have the ability to minimize filtrate and particle invasion into the formation. U.S. Pat. No. 5,504,062 also disclosed, a formulation of particle sizes that protect the formation and flow back through conventional gravel pack media with minimal damage to the production potential of a formation. These fluids have been designed for use in openhole well construction; more particularly they are used for openhole horizontal drilling. Other fluid systems are disclosed U.S. Pat. Nos. 4,620,596, 4,369,843; and 4,186,803 to Mondshine, incorporated herein by reference. The fluid system includes sized salt particles; which protect the formation during well construction and workover operations. The fluids disclosed by Mondshine have been applied as drilling fluids in horizontal openhole well construction. If the fluids disclosed by Mondshine are used in the present invention, a solvent would be required to reduce the filter cake particle sizes or completely dissolve the salt particles in the filter cake. These particular fluids are of interest in the invention because the solvent may come from conate water, water already present in the formation, which would dissolve the salt particles insitu and eliminate having to pump an acid or solvent into the well prior to production. While the use of the fluids mentioned above are preferred embodiments for the inventive method, the use of these fluid systems should not be interpreted as a limitation. As new polymers and fluid formulations are tested and become available in the market which protect the formation and have the ability to be dissolved or sufficiently flow back through the gravel pack filter medium to maximize productivity. These fluids, which are used in well construction for drilling openhole horizontal wells, are a class of drilling fluids known as “Drill-In Fluids.”
- Referring to
FIG. 1 , a drilling vessel orplatform 2 including a drilling rig 1. A subseablowout preventer stack 3 may be positioned on anocean floor 3 a in offshore application. Thewell casing string 45 includes aconductor elements 4, asurface element 5, and anintermediate element 6. As is well understood by those of ordinary skill in the art, the casing string is placed in boreholes and then cemented in place. As is shown inFIG. 1 , drilling of awell borehole 50 is continued to atarget reservoir 16. Thedrilling assembly 55 includes of adrill string 7, logging while drillingformation evaluation sensors 8, adrilling motor 9, adrill string stabilizer 10, and adrill bit 11. As is shown inFIG. 1 , thebottom hole assembly 12, includes the logging while drillingformation evaluation sensors 8, thedrilling motor 9, thedrill string stabilizer 10, and thedrill bit 11. - As shown in
FIG. 1 , thebottom hole assembly 12 has intersected amarker formation 15. Themarker formation 5 is a selected geological indicator that is reached prior to the borehole 50 intersecting thetarget formation 16. Themarker formation 15 provides an indication of the additional drilling depth needed drill from a currentbottom hole position 14 to thetarget formation 16. When thebottom hole position 14 is approximately 200 to 500 feet above thetarget formation 16, conventional drilling mud is displaced with a “Drill-In Fluid” selected to protect the formation in thetarget reservoir 16 during drilling into or into and through thetarget formation 16. The “Drill-In Fluid” displaces the conventional mud by pumping the “Drill-In Fluid” into thedrill string 7 pushing the conventional drilling fluid out of theborehole 45 via return up anannulus space 13. - Referring now to
FIG. 2 , drilling of theborehole 50 is continued and extended into or into and through thetarget reservoir 16 using the “Drill-In Fluid”. The bottom of the well 14 is now shown extended through thetarget reservoir 16. - Referring now to
FIG. 3 , thetarget reservoir 16 has aformation matrix 27 includingsolid particles 18 andpore spaces 17. Thepore spaces 17 are the area in the formation that generally contains oil, gas, and/or water. Looking atFIG. 3B , an example of what can happen to aformation matrix 28 is graphically depicted if a conventional drilling fluid is used to drill into and through the target reservoir orformation 16. As can be seen in theformation matrix 28, afilter cake 19 has been formed from on aface 28 a of thematrix 28 and mud filtrate and solid particles have invaded thepore spaces 17 which can cause a reduction in well productivity. Looking atFIG. 3C , aformation matrix 29 is shown depicting the use of a “Drill-In Fluid” for drilling within thetarget reservoir 16, which forms afilter cake 20 with little or no invasion of particulate into thepore spaces 17 protecting theformation matrix 29. This type of fluid will minimize any negative effects on productivity. - After reaching the
total depth 14 as shown inFIG. 2 , thedrill string 7 andbottom hole assembly 12 are pulled from theborehole 45. Casing is run into the well. The casing will have extendable members positioned such that when the casing reaches the bottom of the borehole 14 the extendable members are positioned and aligned with sites in thetarget reservoir 16. - Referring now to
FIG. 4 , asection 21 of the target formation orreservoir 16 is depicted showing anadjacent portion 22 a of acasing 22 having anextendable member 23 aligned adjacent asite 21 a of thesection 21 of thetarget reservoir 16. AlthoughFIG. 4 shows only asingle member 23, a plurality ofmembers 23 can be associated with sections of the casing in a spaced apart configuration to provide a plurality of production conduits within thetarget reservoir 16 depending on the production requirements of thereservoir 16. In one preferred arrangement, four extendable members per foot of formation are used to provide an adequate number of production conduits for most formations within producing hydrocarbon reservoirs. However, lesser and greater number of extendable members can be used as well depending on the desired production level. Generally, the number of extendable members will be between 1 per foot of formation to about 20 per foot, with between 2 and 10 being preferred and between 3 and 8 being particularly preferred. - Referring back to
FIG. 4 , anextendable member 23 is shown in its run position or retracted state. Theextendable member 23 includes aninner sleeve 30 having aninner sleeve lip 31, an interior 32, asand control medium 33 disposed in adistal end portion 34 of the interior 32, anouter sleeve 35 having aninner sleeve stop 36 and anouter sleeve lip 37 and a fitting 38 having anouter sleeve stop 39, where the fitting 38 is adapted to attach themember 23 to thecasing 22. Theannulus 13 may be filled at this point with “Drill-In Fluid” or the “Drill-In Fluid” displaced with a solids free fluid. Afilter cake 20 protects aface 21 b of theformation section 21. - Referring now to
FIG. 5 , theexpendable member 23 is shown in its extended state, where hydraulic pressure has been used to force adistal end 40 of themember 23 in contact with aportion 25 of thefilter cake 20 associated with thesite 21 a of thesection 21 of theformation 16. The well is now ready to be cemented. - Referring now to
FIG. 6 , theannulus 13 is shown filled with acement 24 isolating thesection 21 of theformation 16, except for flow control points associated with theextendable members 23. At this point production tubing/equipment is run into the well and the well made ready for production. - Referring now to
FIG. 7 , theformation section 21 is shown producing through an interior 32 of theextendable member 23. It should be noted thatfluid 26 produced fromformation section 21 has removed theportion 25 of thefilter cake 20 in the area constrained by theextendable member 23. Theproduce fluids 26 travel through the interior 32 of theextendable member 23 into an interior 22 b of thecasing 22. The producedfluids 26 continue up thecasing 22 and eventually enter the production tubing. They producedfluids 26 which may contain oil, gas, and/or water flow to the surface via the production tubing for processing and/or sale. Should production not reach expected levels quickly enough a solvent may be used to facilitate filter cake removal. - All references cited herein are incorporated by reference. The terms comprising, including and having are equivalent open ended claim terms and are used interchangeable to make the claims for understandable. While this invention has been described fully and completely, it should be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. Although the invention has been disclosed with reference to its preferred embodiments, from reading this description those of skill in the art may appreciate changes and modification that may be made which do not depart from the scope and spirit of the invention as described above and claimed hereafter.
Claims (56)
1. A method of well construction and completion comprising:
drilling a well with a fluid system into a target formation or reservoir, where the fluid system produces no filter cake or a minimal filter cake on a surface of the target formation;
inserting into the well a casing string including at least one extendable member so that the extendable member is positioned adjacent a site in the target formation or reservoir, where the extendable members have a sand control medium at their distal end, where the sand control medium is adapted to minimize formation damage and maximizing well productivity, while eliminating well perforation and gravel packing;
extending the member until the members contacts the site in target formation or reservoir; and
placing the well on production.
2. (canceled)
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13. (canceled)
14. (canceled)
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16. (canceled)
17. (canceled)
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19. (canceled)
20. (canceled)
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23. (canceled)
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27. (canceled)
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29. (canceled)
30. (canceled)
31. (canceled)
32. (canceled)
33. (canceled)
34. (canceled)
35. (canceled)
36. The method of claim 1 , wherein the fluid system is a “Drill-In Fluid.”
37. The method of claim 1 , wherein the fluid has a hydrostatic pressure that is less than or equal to the pressure of the target reservoir.
38. The method of claim 1 , further comprising the step of:
circulating a solvent through the well after the placing step, where the solvent is designed to remove portions of the filter cake from the surface of the target formation, where the portions are associated with the extendable members.
39. The method of claim 1 , further comprising the step of:
cementing the casing in place.
40. The method of claim 39 , further comprising the step of:
circulating a solvent through the well after the placing step, where the solvent is designed to remove portions of the filter cake from the surface of the target formation, where the portions are associated with the extendable members.
41. The method of claim 39 , wherein the extending step is after the cementing step.
42. The method of claim 39 , wherein the fluid system is a “Drill-In Fluid.”
43. The method of claim 42 , wherein the fluid has a hydrostatic pressure that is less than or equal to the pressure of the target reservoir.
44. A method of well construction and completion comprising:
drilling a well with a first fluid system to a point above a target reservoir;
displacing the first fluid system with a second fluid system, where the second fluid system produces no filter cake or a minimal filter cake on a surface of the target formation;
drilling a remaining portion of the well into the target reservoir;
inserting into the well a casing string including at least one extendable member so that the extendable member is positioned adjacent a site in the target formation or reservoir, where the extendable members have a sand control medium at their distal end, where the sand control medium is adapted to minimize formation damage and maximizing well productivity, while eliminating well perforation and gravel packing;
extending the member until the member contacts the site in target reservoir; and
placing the well on production.
45. The method of claim 44 , wherein the first fluid system is a conventional drilling fluid and the second fluid system is a “Drill-In Fluid.”
46. The method of claim 45 , wherein the second fluid system has a hydrostatic pressure that is less than or equal to the pressure of the target reservoir.
47. The method of claim 44 , further comprising the step of:
circulating a solvent through the well after the placing step, where the solvent is designed to remove portions of the filter cake from the surface of the target formation, where the portions are associated with the extendable members.
48. The method of claim 44 , further comprising the step of:
cementing the casing.
49. The method of claim 48 , further comprising the step of:
circulating a solvent through the well after the placing step, where the solvent is designed to remove portions of the filter cake from the surface of the target formation, where the portions are associated with the extendable members.
50. The method of claim 48 , wherein the extending step occurs after cementing step.
51. The method of claim 48 , wherein the first fluid system is a convention drilling fluid and the second fluid system is a “Drill-In Fluid.”
52. The method of claim 51 , wherein the second fluid system has a hydrostatic pressure that is less than or equal to the pressure of the target reservoir.
53. A well comprising a borehole and a casing inserted into the borehole, where the casing includes at least one extendable member having a retracted state and an extended state, where the casing is designed to be positioned in the well so that the at least one member is adjacent a site in a productive formation and when extended forms a production conduit between the formation at sites in a target formation having no filter cake or a minimal filter cake on a surface thereof and an interior of the casing, where the extendable members have a sand control medium at their distal end, where the sand control medium is adapted to minimize formation damage and maximizing well productivity, while eliminating well perforation and gravel packing.
54. The well of claim 53 , wherein the casing includes a plurality of extendable members, each of the members being positioned adjacent a site in the productive formation and each of the members designed to form a productive conduit between the productive formation and the interior of the casing.
55. The well of claim 53 , further comprising a cement layer between a formation face of the productive formation and an exterior surface of the casing.
56. The well of claim 54 , further comprising a cement layer between a formation face of the productive formation and an exterior surface of the casing.
Priority Applications (1)
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PCT/US2002/040696 WO2003052238A1 (en) | 2001-12-18 | 2002-12-18 | A drilling method for maintaining productivity while eliminating perforating and gravel packing |
US10/499,112 US20060108114A1 (en) | 2001-12-18 | 2002-12-18 | Drilling method for maintaining productivity while eliminating perforating and gravel packing |
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Also Published As
Publication number | Publication date |
---|---|
EP1461510A1 (en) | 2004-09-29 |
EP1461510B1 (en) | 2007-04-18 |
DE60219689T2 (en) | 2008-01-17 |
WO2003052238A1 (en) | 2003-06-26 |
AU2002361794A1 (en) | 2003-06-30 |
DE60219689D1 (en) | 2007-05-31 |
CA2471261A1 (en) | 2003-06-26 |
ATE360133T1 (en) | 2007-05-15 |
NO20042783L (en) | 2004-08-27 |
EP1772589A1 (en) | 2007-04-11 |
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