US20070051521A1 - Retrievable frac packer - Google Patents
Retrievable frac packer Download PDFInfo
- Publication number
- US20070051521A1 US20070051521A1 US11/222,356 US22235605A US2007051521A1 US 20070051521 A1 US20070051521 A1 US 20070051521A1 US 22235605 A US22235605 A US 22235605A US 2007051521 A1 US2007051521 A1 US 2007051521A1
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- US
- United States
- Prior art keywords
- frac
- packer
- frac packer
- selectively
- latch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for setting packers
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1294—Packers; Plugs with mechanical slips for hooking into the casing characterised by a valve, e.g. a by-pass valve
Definitions
- the invention relates to frac packers which can be used in downhole environments, retrieved, and reconditioned for further use rather than requiring the time and expense to drill out, and thus destroy, the tool after use.
- frac a well involves the introduction of media, typically containing a proppant, into a zone surrounding the wellbore to create flow conduits in the surrounding earth.
- media typically containing a proppant
- Another approach is to use a packer in combination with a separate, retrievable bridge plug, with the two tools straddling the frac zone.
- a separate, retrievable bridge plug with the two tools straddling the frac zone.
- such an approach requires two separate tools to perform a single task, adding cost and complexity to the process. Accordingly, it is desirable to provide a single, retrievable frac packer tool, which can be reconditioned and reused rather than being used once and being destroyed.
- frac tool which provides bi-directional flow control, thereby providing the capability of not only sealing off the well down-hole of the packer from pressure from above during the frac operation, but also allowing flow from below to be selectively closed off. It is further desirable to provide such tools with flagging media, such as dyes, so that tools used in different frac zones may contain differentiating markings within the flagging media, and thus provide the surface operators with confirmation of the existence of production flow at different levels in the wellbore.
- flagging media such as dyes
- the invention is a frac packer that comprises an annular body comprising a circumferential seal that can be set by compression. When the tool is run downhole, the seal is in the “un-set” position, allowing clearance between the tool and the surrounding casing. A check valve is provided within the annular body to preclude downhole flow of fluid through the tool once the tool is set in the desired position.
- the tool is set by wireline control, hydraulic pressure, mechanical means, or a combination of these techniques to compress and engage the circumferential seal with the inner wall of the surrounding casing.
- Compression pressure is applied to the seals by an upper compression member in slidable engagement with the annular body of the tool, and by a lower compression member in slidable engagement with the annular body of the tool.
- Downward travel of the lower compression member may be resisted by mechanical stops.
- the lower compression member is biased upward by mechanical means, such as a spring, to provide improved sealing force and to assist in the release of the tool after the frac operation. If the tool is to be utilized in wells in which multiple tools will be retrieved simultaneously, such a mechanical biasing is necessary to insure that the tools will release properly and move further down the wellbore to retrieve a deeper set frac packer, and retrieve properly.
- a slip is preferably present in slideable engagement with the annular body of the tool on the downhole side of the seal, so that the compression setting of the tool also activates the slip into locking engagement with the casing in the wellbore, thus securing the tool against slippage within the casing before, during, or after the frac operation.
- a selectively releasable latch such as a ratcheting mechanism, so that the seal is held in sealing engagement with the well casing during the frac operation.
- Release of the latch is preferably accomplished by mechanical means, such as a shear means, like studs or screws, so that the tool may be released from its sealing engagement with the well casing by a jarring effect or other mechanical force controllable from the surface.
- a first check valve is positioned inside the annulus of the annular body of the tool to allow fluid flow from the downhole end of the tool upward, but not from the uphole end of the tool downward.
- flow can be allowed through the tool from below if necessary, while simultaneously sealing the environment downhole of the tool from pressure above the tool during the frac operation.
- the tool may also be configured with a second check valve positioned in opposed configuration to and uphole of the first check valve, creating a region within the annulus of the tool through which no flow may occur.
- This second check valve preferably comprises a degradable ball seal, which will degrade at a calculated time to allow upwardly-directed flow through the tool, or a mechanically releasable seal which will open when frac pressure reaches the tool.
- the tool may be configured with a flagging media, such as a dye package, so that when flow begins through the tool the flagging media will be released to flow to the surface.
- a flagging media such as a dye package
- multiple tools with differently-marked flagging media may be used in multiple commingled production zones to provide confirmation at the surface of which of the commingled zones are flowing.
- the downhole end of the annular body of the tool is provided with a grip capable of latching onto the uphole end of another of such tools.
- FIG. 1A is a sectional view of one embodiment of the retrievable frac packer of the present invention in the run-in position.
- FIG. 1B is a sectional view of the embodiment depicted in FIG. 1A , with an optional flagging media package added.
- FIG. 1C is a sectional view of the embodiment depicted in FIG. 1A , with a second check valve incorporated.
- FIG. 2A is sectional view of an alternative embodiment of the retrievable frac packer depicted in FIG. 1A , with the first check valve replaced with an alternative sliding sleeve and sealing ball valve.
- FIG. 2B is an expanded sectional view of the alternative check valve of FIG. 2A , with the sliding sleeve of the valve in its initial position.
- FIG. 2C is an expanded sectional view of the alternative check valve of FIG. 2A , with the sliding sleeve of the valve in its final position.
- FIG. 3A is a sectional view of the retrievable frac packer of FIG. 1C , shown in the set position.
- FIG. 3B is a sectional view of the retrievable frac packer of FIG. 3A , shown with the degradable ball having dissolved and with flow occurring through the tool.
- the retrievable frac packer 10 comprises an annular body 12 , which can be run-in to an appropriate position in a well casing 14 .
- Compressible seal 16 is positioned to be placed into sealing engagement with the inner wall 18 of the well casing 14 .
- Upper compression member 20 is moveable by wireline control, hydraulic setting means, or a combination of hydraulic and mechanical means (not shown) to force upper linkage 22 downward against the compressible seal 16 .
- First check valve 42 allows the retrievable frac packer 10 to protect the region below from hydraulic pressures above so that frac operations may proceed. However, first check valve 42 also allows flow testing of the well to occur without removing the retrievable frac packer 10 from the well. For such purposes, a flagging media such as dye pack 44 may be carried downhole within the annulur body of the retrievable frac packer 10 . In a multiple production zone well, multiple retrievable frac packers 10 may be inserted into different production zones with uniquely-marked flagging media, providing confirmation on the surface of which zones are flowing.
- second check valve 46 incorporates a degradable ball 48 , allowing the retrievable frac packer 10 to be run in to the well as a bridge plug. After a calculated time in the well environment, the degradable ball 48 will dissolve, allowing the retrievable frac packer 10 to operate as described above.
- FIG. 2 an alternative embodiment of the retrievable frac packer 10 of FIGS. 1A-1C is shown.
- First check valve 42 of FIG. 1 is replaced by a sliding sleeve valve 242 .
- sliding sleeve valve 242 seals in both directions, and allows retrievable frac packer 210 to be run-in as a bridge plug.
- hydraulic pressure may be applied, for example, at the same time frac operations are conducted above the retrievable frac packer 210 , sliding sleeve 250 into an open position 252 and allowing sliding sleeve valve 242 to function in the same manner as first check valve 42 of FIG. 1 .
- retrievable frac packer 310 is shown in the set position.
- Upper compression member 320 has been moved downward relative to the annular body 312 of retrievable frac packer 310 .
- Compressible seal 316 is in sealing contact with the inner wall 318 of the well casing 314 .
- Latch 330 is set by the interlocking of ratchet arm 332 with ratchet base 334 , preventing loss of compression force against compressible seal 316 .
- Slip 328 is also forced outward into mechanical engagement with the inner wall 318 of well casing 314 , resulting from the downward movement of lower compression member 324 relative to the annular body 312 of retrievable frac packer 310 .
- the initial setting of retrievable frac packer 310 allows frac operations to proceed.
- First check valve 342 and compressible seal 316 prevent fluid flow downhole of the retrievable frac packer 310 during frac operations.
- second check valve 346 “opens,” and flow may be tested prior to removal of the retrievable frac packer 310 , as shown in FIG. 3B .
- Upward flow pressure opens first check valve 342 , allowing test production flow to proceed up the wellbore.
Abstract
A retrievable frac packer is provided which allows frac operations to be conducted with a single, retrievable tool, with the capability of providing positive zone production indications during production testing.
Description
- The invention relates to frac packers which can be used in downhole environments, retrieved, and reconditioned for further use rather than requiring the time and expense to drill out, and thus destroy, the tool after use.
- To “frac” a well involves the introduction of media, typically containing a proppant, into a zone surrounding the wellbore to create flow conduits in the surrounding earth. In the interest of cost reduction, it is desirable to carry out such an operation as quickly as possible, and with as few trips up and down the wellbore as possible. For frac operations, it is necessary to introduce a seal in the wellbore to prevent the frac fluid from travelling further downhole than the desired frac zone.
- However, wells often have multiple production zones as well as multiple zones where performing the frac operation is desirable. Therefore, the seal which is introduced into the wellbore must be, or is certainly preferably, removable to allow free communication with the wellbore below. Various combinations of devices have been used to accomplish these goals. For example, drillable frac packers are used which allow a single tool to perform the needed tasks. However, these tools require expensive surface support equipment in order to be drilled out after the frac operation is completed. Drilling out such tools is time consuming, and therefore expensive, and can result in undesirable damage to the inside of the wellbore. Further, tool cost using this approach is driven up because the tools themselves must be considered as expendable.
- Another approach is to use a packer in combination with a separate, retrievable bridge plug, with the two tools straddling the frac zone. However, such an approach requires two separate tools to perform a single task, adding cost and complexity to the process. Accordingly, it is desirable to provide a single, retrievable frac packer tool, which can be reconditioned and reused rather than being used once and being destroyed.
- Further, because these tools are often used in wells with multiple frac zones, it is desirable to provide a frac tool which provides bi-directional flow control, thereby providing the capability of not only sealing off the well down-hole of the packer from pressure from above during the frac operation, but also allowing flow from below to be selectively closed off. It is further desirable to provide such tools with flagging media, such as dyes, so that tools used in different frac zones may contain differentiating markings within the flagging media, and thus provide the surface operators with confirmation of the existence of production flow at different levels in the wellbore.
- The interests of keeping costs down additionally makes it desirable to provide a retrievable frac packer which is sufficiently compact and lightweight to allow it to be run-in on wireline, coiled tubing, or other deployment methods and which has the flexibility to be settable either by wireline, hydraulic pressure, or other setting methods, including combinations of hydraulic and mechanical methods.
- Accordingly, it is an object of the invention to provide a retrievable frac packer which provides a single-tool capable of allowing the frac operation to proceed, but which may be retrieved and reconditioned for repeated use.
- It is a further object of the invention to provide such a tool that can also be retrieved in groups of two or more tools at a time, reducing the number of downhole trips required to retrieve the tools when there are multiple frac zones in a well.
- It is another object of the invention to provide a retrievable frac packer that provides bidirectional flow control.
- It is yet another object of the invention to provide a retrievable frac packer that can provide confirmation to surface operators of the downhole level or levels which are producing product flow.
- It is still a further object of the invention to provide a retrievable frac packer which can be run-in on wireline, coiled tubing, or another type of tool string, and which can be set by either wireline, hydraulic methods, or other setting methods.
- The invention is a frac packer that comprises an annular body comprising a circumferential seal that can be set by compression. When the tool is run downhole, the seal is in the “un-set” position, allowing clearance between the tool and the surrounding casing. A check valve is provided within the annular body to preclude downhole flow of fluid through the tool once the tool is set in the desired position.
- At the desired depth, the tool is set by wireline control, hydraulic pressure, mechanical means, or a combination of these techniques to compress and engage the circumferential seal with the inner wall of the surrounding casing. Compression pressure is applied to the seals by an upper compression member in slidable engagement with the annular body of the tool, and by a lower compression member in slidable engagement with the annular body of the tool. Downward travel of the lower compression member may be resisted by mechanical stops. However, in the preferred embodiment, the lower compression member is biased upward by mechanical means, such as a spring, to provide improved sealing force and to assist in the release of the tool after the frac operation. If the tool is to be utilized in wells in which multiple tools will be retrieved simultaneously, such a mechanical biasing is necessary to insure that the tools will release properly and move further down the wellbore to retrieve a deeper set frac packer, and retrieve properly.
- A slip is preferably present in slideable engagement with the annular body of the tool on the downhole side of the seal, so that the compression setting of the tool also activates the slip into locking engagement with the casing in the wellbore, thus securing the tool against slippage within the casing before, during, or after the frac operation.
- Once compressed into sealing engagement with the well casing, the position of the upper compression member relative to the annular body of the tool is locked by a selectively releasable latch, such as a ratcheting mechanism, so that the seal is held in sealing engagement with the well casing during the frac operation. Release of the latch is preferably accomplished by mechanical means, such as a shear means, like studs or screws, so that the tool may be released from its sealing engagement with the well casing by a jarring effect or other mechanical force controllable from the surface.
- Inside the annulus of the annular body of the tool, a first check valve is positioned to allow fluid flow from the downhole end of the tool upward, but not from the uphole end of the tool downward. Thus, flow can be allowed through the tool from below if necessary, while simultaneously sealing the environment downhole of the tool from pressure above the tool during the frac operation.
- The tool may also be configured with a second check valve positioned in opposed configuration to and uphole of the first check valve, creating a region within the annulus of the tool through which no flow may occur. This second check valve preferably comprises a degradable ball seal, which will degrade at a calculated time to allow upwardly-directed flow through the tool, or a mechanically releasable seal which will open when frac pressure reaches the tool.
- In conjunction with such a second check valve, the tool may be configured with a flagging media, such as a dye package, so that when flow begins through the tool the flagging media will be released to flow to the surface. In this configuration, multiple tools with differently-marked flagging media may be used in multiple commingled production zones to provide confirmation at the surface of which of the commingled zones are flowing.
- In the preferred embodiment, the downhole end of the annular body of the tool is provided with a grip capable of latching onto the uphole end of another of such tools. Thus, when frac operations are completed in a wellbore with multiple zones, each tool may be released in turn, then moved downhole to latch onto and release the next lower tool. In this way, multiple tools may be retrieved simultaneously, reducing the number of trips required to clear the tools from the wellbore.
-
FIG. 1A is a sectional view of one embodiment of the retrievable frac packer of the present invention in the run-in position. -
FIG. 1B is a sectional view of the embodiment depicted inFIG. 1A , with an optional flagging media package added. -
FIG. 1C is a sectional view of the embodiment depicted inFIG. 1A , with a second check valve incorporated. -
FIG. 2A is sectional view of an alternative embodiment of the retrievable frac packer depicted inFIG. 1A , with the first check valve replaced with an alternative sliding sleeve and sealing ball valve. -
FIG. 2B is an expanded sectional view of the alternative check valve ofFIG. 2A , with the sliding sleeve of the valve in its initial position. -
FIG. 2C is an expanded sectional view of the alternative check valve ofFIG. 2A , with the sliding sleeve of the valve in its final position. -
FIG. 3A is a sectional view of the retrievable frac packer ofFIG. 1C , shown in the set position. -
FIG. 3B is a sectional view of the retrievable frac packer ofFIG. 3A , shown with the degradable ball having dissolved and with flow occurring through the tool. - Referring to
FIGS. 1A and 1B , one embodiment of the retrievable frac packer of the present invention is shown. Theretrievable frac packer 10 comprises anannular body 12, which can be run-in to an appropriate position in awell casing 14.Compressible seal 16 is positioned to be placed into sealing engagement with theinner wall 18 of thewell casing 14.Upper compression member 20 is moveable by wireline control, hydraulic setting means, or a combination of hydraulic and mechanical means (not shown) to forceupper linkage 22 downward against thecompressible seal 16. - Such movement will also force
lower compression member 24 downward, compressingmechanical biasing spring 26, and applying upward force againstcompressible seal 16. The downward movement oflower compression member 24 also will forceslip 28 outward into mechanical engagement with theinner wall 18 of thewell casing 14. - Downward movement of
upper compression member 20 also engageslatch 30 into a locking position by movingratchet arm 32 into locking engagement withratchet base 34.Spring 36 applies biasing force to aid in holdingratchet arm 32 into a locked position once set. Slidingpush sleeve 37 allows the downward force to be transmitted to sealbase sleeve 39 through a path other than through shear means 38, protecting shear means 38 from excessive force during the setting operation. - When release of the
retrievable frac packer 10 from its set position is desired, an upward jar may be applied, shearing shear means 38. This in turn will allow the upward movement ofupper linkage 22, which interlocks withratchet arm 32, thus releasinglatch 30 and allowingupper compression member 20 to move upward. Bias force fromcompression spring 26 further assists in this upward movement, relieving pressure againstcompressible seal 16 and allowingslip 28 to release its mechanical engagement with theinner wall 18 ofwell casing 14. -
First check valve 42 allows theretrievable frac packer 10 to protect the region below from hydraulic pressures above so that frac operations may proceed. However,first check valve 42 also allows flow testing of the well to occur without removing theretrievable frac packer 10 from the well. For such purposes, a flagging media such asdye pack 44 may be carried downhole within the annulur body of theretrievable frac packer 10. In a multiple production zone well, multiple retrievablefrac packers 10 may be inserted into different production zones with uniquely-marked flagging media, providing confirmation on the surface of which zones are flowing. - Referring to
FIG. 1C , an alternative embodiment of theretrievable frac packer 10 is shown incorporating asecond check valve 46. In this embodiment,second check valve 46 incorporates adegradable ball 48, allowing theretrievable frac packer 10 to be run in to the well as a bridge plug. After a calculated time in the well environment, thedegradable ball 48 will dissolve, allowing theretrievable frac packer 10 to operate as described above. - Referring to
FIG. 2 , an alternative embodiment of theretrievable frac packer 10 ofFIGS. 1A-1C is shown.First check valve 42 ofFIG. 1 is replaced by a slidingsleeve valve 242. For run-in, slidingsleeve valve 242 seals in both directions, and allows retrievablefrac packer 210 to be run-in as a bridge plug. Once in position, hydraulic pressure may be applied, for example, at the same time frac operations are conducted above theretrievable frac packer 210, slidingsleeve 250 into anopen position 252 and allowing slidingsleeve valve 242 to function in the same manner asfirst check valve 42 ofFIG. 1 . - Referring now to
FIGS. 3A and 3B , retrievablefrac packer 310 is shown in the set position.Upper compression member 320 has been moved downward relative to theannular body 312 of retrievablefrac packer 310.Compressible seal 316 is in sealing contact with theinner wall 318 of thewell casing 314.Latch 330 is set by the interlocking ofratchet arm 332 withratchet base 334, preventing loss of compression force againstcompressible seal 316. Slip 328 is also forced outward into mechanical engagement with theinner wall 318 ofwell casing 314, resulting from the downward movement oflower compression member 324 relative to theannular body 312 of retrievablefrac packer 310. - As shown in
FIG. 3A , the initial setting of retrievablefrac packer 310 allows frac operations to proceed.First check valve 342 andcompressible seal 316 prevent fluid flow downhole of theretrievable frac packer 310 during frac operations. After thedegradable ball 348 has dissolved,second check valve 346 “opens,” and flow may be tested prior to removal of theretrievable frac packer 310, as shown inFIG. 3B . Upward flow pressure opensfirst check valve 342, allowing test production flow to proceed up the wellbore. - The above examples are included for demonstration purposes only and not as limitations on the scope of the invention. Other variations in the construction of the invention may be made without departing from the spirit of the invention, and those of skill in the art will recognize that these descriptions are provide by way of example only.
Claims (21)
1. A selectively settable and retrievable frac packer for use inside an annular tube having an inner surface, comprising
an annular body comprising a selectively settable and releasable circumferential seal,
a selectively settable and releasable latch, wherein said latch has a latched position which restrains said circumferential seal in sealing engagement with the inner surface of the annular tube and an unlatched position which releases said seal, and
a first valve which selectively controls fluid flow through the annulus of said annular body.
2. The frac packer of claim 1 , wherein said latch is wireline settable.
3. The frac packer of claim 1 , wherein said latch is hydraulically settable.
4. The frac packer of claim 1 , wherein said latch is settable by tubing-conveyed means.
5. The frac packer of claim 1 , wherein said latch is mechanically settable.
6. The frac packer of claim 1 , wherein said latch is settable by a combination of hydraulic and mechanical action.
7. The frac packer of claim 1 , additionally comprising selectively settable and releasable frictional contact between said annular body and the inner surface of the annular tube.
8. The frac packer of claim 7 , wherein said frictional contact comprises a slip.
9. The frac packer of claim 7 , wherein the position of said latch additionally controls the position of said frictional contact.
10. The frac packer of claim 1 , additionally comprising a mechanical bias device to assist in releasing said circumferential seal when said latch is moved from its latched position to its unlatched position.
11. The frac packer of claim 7 , additionally comprising a mechanical bias device to assist in releasing said circumferential seal and said frictional contact when said latch is moved from its latched position to its unlatched position.
12. The frac packer of claim 10 , wherein said mechanical bias device is a spring.
13. The frac packer of claim 11 , wherein said mechanical bias device is a spring.
14. The frac packer of claim 1 , additionally comprising a second valve which selectively controls fluid flow through the annulus of said annular body.
15. The frac packer of claim 1 , additionally comprising a selectively releasable flagging media within the annulus of said annular body.
16. The frac packer of claim 1 , additionally comprising a connector capable of selectively engaging a second frac packer for simultaneous retrieval of both said frac packer and said second frac packer.
17. A method of using a frac packer in a wellbore, comprising
lowering said frac packer to the desired depth,
selectively setting seals on said frac packer to isolate the wellbore above said frac packer from the wellbore below said frac packer,
selectively controlling fluid flow through said frac packer,
selectively releasing said seals, and
retrieving said frac packer from the wellbore.
18. The method of claim 17 , additionally comprising the step of selectively allowing flow in one direction through said frac packer.
19. The method of claim 17 , wherein the step of retrieving said frac packer additionally comprises the step of retrieving a second frac packer from the wellbore on the same tool string.
20. The method of claim 17 , wherein the step of retrieving said frac packer additionally comprises the step of retrieving multiple additional frac packers from the wellbore on the same tool string.
21. The method of claim 17 , additionally comprising the step of selectively releasing a flagging media from said frac packer.
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US11/222,356 US20070051521A1 (en) | 2005-09-08 | 2005-09-08 | Retrievable frac packer |
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US11/222,356 US20070051521A1 (en) | 2005-09-08 | 2005-09-08 | Retrievable frac packer |
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Owner name: EAGLE DOWNHOLE SOLUTIONS, LLC, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FIKE, JASON;TRAHAN, KEVIN O.;TRAHAN, JABIAN P.;REEL/FRAME:016969/0267;SIGNING DATES FROM 20050907 TO 20050908 |
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