WO2005119003A1 - Compositions and methods of stabilizing subterranean formations containing reactive shales - Google Patents
Compositions and methods of stabilizing subterranean formations containing reactive shales Download PDFInfo
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- WO2005119003A1 WO2005119003A1 PCT/GB2005/001594 GB2005001594W WO2005119003A1 WO 2005119003 A1 WO2005119003 A1 WO 2005119003A1 GB 2005001594 W GB2005001594 W GB 2005001594W WO 2005119003 A1 WO2005119003 A1 WO 2005119003A1
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- shale
- polymer
- hydrophilic
- treatment fluid
- hydrophobically modified
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/607—Compositions for stimulating production by acting on the underground formation specially adapted for clay formations
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/60—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing nitrogen in addition to the carbonamido nitrogen
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Definitions
- a treatment fluid may be used in a subterranean formation in a variety of ways.
- a fluid may be used to drill a well bore in a subterranean formation, to stimulate a well bore in a subterranean formation, or to complete a well bore in a subterranean formation, as well as or for a number of other purposes.
- the process of drilling a well typically requires the use of a drilling fluid.
- a drilling fluid used in connection with drilling a well in a subterranean formation may comprise a number of fluids (gaseous or liquid) and mixtures of fluids and solids (e.g., as solid suspensions, mixtures and/or emulsions of liquids, gases and solids) used in operations to drill well bores into subterranean formations.
- Drilling fluids are used, inter alia, to cool the drill bit, to lubricate the rotating drill pipe to prevent it from sticking to the walls of the well bore, to prevent blowouts by serving as a hydrostatic head to counteract the sudden entrance into the well bore of high pressure formation fluids, and to remove drill cuttings from the well bore.
- shale will be understood to mean materials such as certain types of clays (e.g., bentonite) and related subterranean materials that may "swell,” or increase in volume, when exposed to water.
- the shale may be problematic during drilling operations because, inter alia, of its tendency to swell when exposed to aqueous media, such as aqueous-based drilling fluids. Shale swelling may result in undesirable drilling conditions and undesirable interference with the drilling fluid.
- shale swelling may impede the removal of drill cuttings from beneath the drill bit, increase the friction between the drill string and the sides of the well bore, and inhibit the formation of a desirable filter cake on the formation.
- Shale swelling also may result in other problems, such as the loss of drilling fluid circulation or stuck pipe that may result in undesirable delays and expenses.
- shale swelling also may substantially decrease the stability of the well bore, which may cause irregularities in the diameter of the well bore, e.g., the diameter of some portions of the well bore may be either smaller or greater than optimally desired. In an extreme case, shale swelling may decrease the stability of the well bore to such an extent that the well bore may collapse.
- shale-inhibiting component refers to a compound that demonstrates a propensity for inhibiting the tendency of shales to swell by absorbing water. Salts, such as potassium chloride, are one example of a conventional shale-inhibiting component.
- salts may reduce the tendency of shales to swell, they also may flocculate the shale, resulting in undesirable fluid loss and a loss of thixotropy. Furthermore, an increase in salinity may result in a decrease in the functional characteristics of drilling fluid additives.
- conventional shale-inhibiting components include, but are not limited to, amphoteric materials, polyglycols, partially hydrolyzed polyacrylamides, combinations of thickeners such as a copolymer and a polysaccharide, and polymers with a hydrophilic group and a hydrophobic group.
- the present invention relates to well bore stabilization and, more particularly, to treatment fluids that may reduce the tendency of shales to swell and associated methods.
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polyvinylamine, or a poly(vinylamine/vinyl alcohol).
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer formed from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the hydrophilic monomer comprises N,N-dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl methacrylate; dimethylaminopropylmethacrylamide; vinyl amine; vinyl acetate; trimethylammoniumethyl methacrylate chloride; hydroxyethyl acrylate; vinyl sulfonic acid; vinyl phosphonic acid; vinyl caprolactam; N-vinylformamide; N,N-diallylacetamide; dimethyldiallyl ammonium halide; styrene sulfonic acid; or a quaternary salt derivative of acrylamide.
- the hydrophilic monomer comprises N,N-di
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophilically modified polymer.
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polyvinylamine, or a poly(vinylamine/vinyl alcohol).
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer formed from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the hydrophilic monomer comprises N,N- dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl methacrylate; dimethylaminopropylmethacrylamide; vinyl amine; vinyl acetate; trimethylammoniumethyl methacrylate chloride; hydroxyethyl acrylate; vinyl sulfonic acid; vinyl phosphonic acid; vinyl caprolactam; N-vinylformamide; N,N-diallylacetamide; dimethyldiallyl ammonium halide; styrene sulfonic acid; or a quaternary salt derivative of acrylamide.
- the hydrophilic monomer comprises N,N- dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl
- the present invention provides a shale-inhibiting component that comprises a hydrophilically modified polymer.
- a shale-inhibiting component that comprises a hydrophilically modified polymer.
- the methods of the present invention are useful in conjunction with a wide variety of treatment fluids (e.g., drilling fluids, completion fluids, stimulation fluids, and remedial fluids, and the like) when it is desired to stabilize the subterranean formation (e.g., by controlling the tendency of shale to swell), they are particularly useful with drilling fluids.
- the treatment fluids of the present invention generally comprise a base fluid and a hydrophobically modified polymer.
- hydrophobically modified refers to the incorporation into the hydrophilic polymer structure of hydrophobic groups, wherein the alkyl chain length is from about 4 to about 22 carbons.
- the treatment fluids of the present invention generally comprise a base fluid and a hydrophilically modified polymer.
- hydrophilically modified refers to the incorporation into the hydrophilic polymer structure of hydrophilic groups.
- the hydrophobically modified polymers and hydrophilically modified polymers of the present invention may stabilize subterranean formations containing shale, inter alia, by inhibiting the tendency of shales to swell by absorbing water.
- the base fluid utilized in the treatment fluids of the present invention may be aqueous-based, or oil-based, or mixtures thereof.
- the water utilized may be fresh water, saltwater (e.g., water containing one or more salts dissolved therein), brine (e.g., saturated saltwater), or seawater.
- the water may be from any source, provided that it does not contain an excess of compounds that may adversely affect other components in the drilling fluid.
- suitable oils include, but are not limited to, mineral oils, synthetic oils, esters, and the like.
- any oil that can be emulsified is suitable for use as a base fluid in the treatment fluids of the present invention.
- oil-based treatment fluids e.g., oil-based drilling fluids
- oil-based treatment fluids may comprise an emulsified aqueous phase.
- the emulsification of the aqueous phase allows the water-soluble shale-inhibiting component to be incorporated into the oil-based treatment fluids without or with limited undesirable interactions between the aqueous phase and the water-soluble shale-inhibiting component.
- the treatment fluids of the present invention comprise a hydrophobically modified polymer.
- the shale-inhibiting components of the present invention comprise a hydrophobically modified polymer.
- the hydrophobically modified polymers of the present invention typically have a molecular weight in the range of from about 100,000 to about 10,000,000.
- the hydrophobically modified polymers are water-soluble.
- water-soluble refers to at least 0.01 weight percent soluble in distilled water.
- a mole ratio of a hydrophilic monomer to the hydrophobic compound in the hydrophobically modified polymer is in the range of from about 99.98:0.02 to about 90:10, wherein the hydrophilic monomer is a calculated amount present in the hydrophilic polymer.
- the hydrophobically modified polymers may comprise a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- the polar heteroatoms present within the polymer backbone of the hydrophobically modified polymers include, but are not limited to, oxygen, nitrogen, sulfur, or phosphorous.
- the hydrophobically modified polymers may be a reaction product of a hydrophilic polymer and a hydrophobic compound.
- the hydrophilic polymers suitable for forming the hydrophobically modified polymers used in the present invention should be capable of reacting with hydrophobic compounds.
- Suitable hydrophilic polymers include, homo-, co-, or terpolymers such as, but not limited to, polyacrylamides, polyvinylamines, poly(vinylamines/vinyl alcohols), and alkyl acrylate polymers in general.
- alkyl acrylate polymers include, but are not limited to, polydimethylaminoethyl methacrylate, polydimethylaminopropyl methacrylamide, poly(acrylamide/dimethylaminoethyl methacrylate), poly(methacrylic acid dimethylaminoethyl methacrylate), poly(acrylamide/dimethylaminopropyl methacrylamide), ⁇ oly(2-acrylamido-2-methyl propane sulfonic acid/dimethylaminoethyl methacrylate), poly (acrylic acid/dimethylaminopropyl methacrylamide), and poly(methacrylic acid/dimethylaminopropyl methacrylamide).
- the hydrophilic polymers contain reactive amino groups in the polymer backbone or as pendant groups, which are capable of reacting with hydrophobic compounds.
- the hydrophilic polymers comprise dialkyl amino pendant groups.
- the hydrophilic polymers comprise a dimethyl amino pendant group and at least one monomer comprising dimethylaminoethyl methacrylate or dimethylaminopropyl methacrylamide.
- the hydrophilic polymers comprise a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the polar heteroatoms present within the polymer backbone of the hydrophilic polymers include, but are not limited to, oxygen, nitrogen, sulfur, or phosphorous.
- Suitable hydrophilic polymers that comprise polar heteroatoms within the polymer backbone include homo-, co-, or terpolymers, such as, but not limited to, celluloses, chitosans, polyamides, polyetheramines, polyethyleneirnines, polyhydroxyetheramines, polylysines, polysulfones, gums, and starches, and derivatives thereof.
- the starch is a cationic starch.
- a suitable cationic starch may be formed by reacting a starch, such as corn, maize, waxy maize, potato, and tapioca, and the like, with the reaction product of epichlorohydrin and trialkylamine.
- the hydrophobic compounds that are capable of reacting with the hydrophilic polymers of the present invention include, but are not limited to, alkyl halides, sulfonates, sulfates, and organic acid derivatives.
- suitable organic acid derivatives include, but are not limited to, octenyl succinic acid; dodecenyl succinic acid; and anhydrides, esters, and amides of octenyl succinic acid or dodecenyl succinic acid.
- the hydrophobic compounds may have an alkyl chain length of from about 4 to about 22 carbons.
- the reaction between the hydrophobic compound and hydrophilic polymer may result in the quaternization of at least some of the hydrophilic polymer amino groups with an alkyl halide, wherein the alkyl chain length is from about 4 to about 22 carbons.
- the hydrophobically modified polymers used in the present invention may be prepared from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer. Examples of suitable methods of their preparation are described in U.S. Patent No. 6,476,169, the relevant disclosure of which is incorporated herein by reference.
- hydrophilic monomers may be used to form the hydrophobically modified polymers useful in the present invention.
- suitable hydrophilic monomers include, but are not limited to homo-, co-, and te ⁇ olymers of acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, N,N-dimethylacrylamide, vinyl pyrrolidone, dimethylaminoethyl methacrylate, acrylic acid, dimethylaminopropylmethacrylamide, vinyl amine, vinyl acetate, trimethylammoniumethyl methacrylate chloride, methacrylamide, hydroxyethyl acrylate, vinyl sulfonic acid, vinyl phosphonic acid, methacrylic acid, vinyl caprolactam, N-vinylformamide, N,N- diallylacetamide, dimethyldiallyl ammonium halide, itaconic acid, styrene sulfonic acid, methacrylamidoethyltrimethyl ammonium halide, it
- hydrophobically modified hydrophilic monomers also may be used to form the hydrophobically modified polymers useful in the present invention.
- suitable hydrophobically modified hydrophilic monomers include, but are not limited to, alkyl acrylates, alkyl methacrylates, alkyl acrylamides, alkyl methacrylamides alkyl dimethylammoniumethyl methacrylate halides, and alkyl dimethylammoniumpropyl methacrylamide halides, wherein the alkyl groups have from about 4 to about 22 carbon atoms.
- the hydrophobically modified hydrophilic monomer comprises octadecyldimethylammoniumethyl methacrylate bromide, hexadecyldimethylammoniumethyl methacrylate bromide, hexadecyldimethylammomumpropyl methacrylamide bromide, 2-ethylhexyl methacrylate, or hexadecyl methacrylamide.
- the hydrophobically modified polymers formed from the above-described polymerization reaction may have estimated molecular weights in the range of from about 100,000 to about 10,000,000 and mole ratios of the hydrophilic monomer(s) to the hydrophobically modified hydrophilic monomer(s) in the range of from about 99.98:0.02 to about 90:10.
- Suitable hydrophobically modified polymers having molecular weights and mole ratios in the ranges set forth above include, but are not limited to, acrylamide/octadecyldimethylammoniumethyl methacrylate bromide copolymer, dimethylaminoethyl methacrylate/hexadecyldimethylammoniumethyl methacrylate bromide copolymer, dimethylaminoethyl methacrylate/vinyl pyrrolidone/hexadecyldimethylammoniumethyl methacrylate bromide te ⁇ olymer and acrylamide/2-acrylamido-2-methyl propane sulfonic acid 2-ethylhexyl methacrylate te ⁇ olymer.
- the hydrophobically modified polymers of the present invention may be present in the treatment fluids in an amount sufficient to provide the desired level of inhibition of shale swelling. Even further, in some embodiments, the hydrophobically modified polymers may be present in the treatment fluids of the present invention in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid. Even further, in certain exemplary embodiments, the hydrophobically modified polymers may be present in the treatment fluids of the present invention in an amount in the range of from about 0.05% to about 1% by weight of the treatment fluid. In some embodiments, the treatment fluids of the present invention comprise a hydrophilically modified polymer.
- the shale-inhibiting components of the present invention comprise a hydrophilically modified polymer.
- the hydrophilically modified polymers used in the present invention typically have a molecular weight in the range of from about 100,000 to about 10,000,000.
- the hydrophilically modified polymers are water-soluble.
- the hydrophilically modified polymers comprise a polymer backbone, the polymer backbone comprising polar heteroatoms.
- the polar heteroatoms present within the polymer backbone of the hydrophilically modified polymers include, but are not limited to, oxygen, nitrogen, sulfur, or phosphorous.
- the hydrophilically modified polymers may be a reaction product of a hydrophilic polymer and a hydrophilic compound.
- hydrophilic polymers suitable for forming the hydrophilically modified polymers used in the present invention should be capable of reacting with hydrophilic compounds.
- suitable hydrophilic polymers include homo-, co-, or te ⁇ olymers, such as, but not limited to, polyacrylamides, polyvinylamines, poly(vinylamines/vinyl alcohols), and alkyl acrylate polymers in general.
- alkyl acrylate polymers include, but are not limited to, polydimethylaminoethyl methacrylate, polydimethylaminopropyl methacrylamide, poly(acrylamide/dimethylaminoethyl methacrylate), poly(methacrylic acid/dimethylaminoethyl methacrylate), poly(2-acrylamido-2-methyl propane sulfonic acid/dimethylaminoethyl methacrylate), poly(acrylamide/dimethylaminopropyl methacrylamide), poly (acrylic acid/dimethylaminopropyl methacrylamide), and poly(methacrylic acid/dimethylaminopropyl methacrylamide).
- the hydrophilic polymers contain reactive amino groups in the polymer backbone or as pendant groups, which are capable of reacting with hydrophilic compounds.
- the hydrophilic polymers comprise dialkyl amino pendant groups.
- the hydrophilic polymers comprise a dimethyl amino pendant group and at least one monomer comprising dimethylaminoethyl methacrylate or dimethylamuiopropyl methacrylamide.
- the hydrophilic polymers comprise a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the polar heteroatoms present within, the polymer backbone of the hydrophilic polymers include, but are not limited to, oxygen, nitrogen, sulfur, or phosphorous.
- Suitable hydrophilic polymers comprising polar heteroatoms within the polymer backbone include homo-, co-, or te ⁇ olymers such as, but not limited to, celluloses, chitosans, polyamides, polyetheramines, polyethyleneimines, polyhydroxyetheramines, polylysines, polysulfones, gums, and starches, and derivatives thereof.
- the starch is a cationic starch.
- a suitable cationic starch may be formed by reacting a starch, such as corn, maize, waxy maize, potato, and tapioca, and the like, with the reaction product of epichlorohydrin and trialkylamine.
- the hydrophilic compounds suitable for reaction with the hydrophilic polymers include, but are not limited to, polyethers comprising a halogens, sulfonates, sulfates, and organic acid derivatives.
- suitable polyethers include, but are not limited to, polyethylene oxides, polypropylene oxides, and polybutylene oxides, and copolymers, te ⁇ olymers, and mixtures thereof.
- the polyether comprises an epichlorohydrin-terminated polyethylene oxide methyl ether.
- the hydrophilically modified polymers formed from the reaction of a hydrophilic polymer and a hydrophilic compound may have estimated molecular weights in the range of from about 100,000 to about 10,000,000 and may have weight ratios of the hydrophilic polymers to the hydrophilic compounds in the range of from about 1:1 to about 10:1.
- Suitable hydrophilically modified polymers having molecular weights and weight ratios in the ranges set forth above include, but are not limited to, the reaction product of polydimethylaminoethyl methacrylate with epichlorohydrin-terminated polyethyleneoxide methyl ether; the reaction product of polydimethylaminopropyl methacrylamide with epichlorohydrin-terminated polyethyleneoxide methyl ether; and the reaction product of poly(acrylamide/dimethylaminopropyl methacrylamide) with epichlorohydrin-terminated polyethyleneoxide methyl ether.
- the hydrophilically modified polymers comprise the reaction product of a polydimethylaminoethyl methacrylate with epichlorohydrin-terminated polyethyleneoxide methyl ether having a weight ratio of polydimethylaminoethyl methacrylate to epichlorohydrin-terminated polyethyleneoxide methyl ether of 3:1.
- the hydrophilically modified polymers of the present invention generally may be present in the treatment fluids in an amount sufficient to provide the desired level of inhibition of shale swelling. Even further, in some embodiments, the hydrophilically modified polymers may be present in the treatment fluids of the present invention in an amount in the range of from about 0.02% to about 10% by weight of the treatment fluid.
- the hydrophilically modified polymers may be present in the treatment fluids of the present invention in an amount in the range of from about 0.05% to about 1% by weight of the treatment fluid.
- Additional additives may be added to the treatment fluids of the present invention as deemed appropriate by one skilled in the art for improving the performance of the treatment fluid with respect to one or more properties. Examples of such additives include, but are not limited to, emulsif ⁇ ers, viscosifying agents, fluid loss control additives, salts, and weighting agents, and numerous other additives suitable for use in subterranean operations.
- the treatment fluids of the present invention may be utilized for carrying out a variety of subterranean well treatments, including, but not limited to, drilling and completion operations.
- Treating a subterranean formation containing shales may include drilling a well bore in or near a portion of the subterranean formation.
- a drilling fluid that comprises a base fluid and a shale-inhibiting component of the present invention may be circulated into a well bore through the inside of a drill string, out through the drill bit, and up to the surface through the annulus between the drill string and the well bore.
- the hydrophobically modified polymers and/or hydrophilically modified polymers may be added to a treatment fluid, inter alia, to reduce the tendency of shales to swell when exposed to the treatment fluid.
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polyvinylamine, or a poly(vinylamine/vinyl alcohol).
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophobically modified polymer formed from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the hydrophilic monomer comprises N,N-dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl methacrylate; dimethylaminopropylmethacrylamide; vinyl amine; vinyl acetate; trimethylammoniumethyl methacrylate chloride; hydroxyethyl acrylate; vinyl sulfonic acid; vinyl phosphonic acid; vinyl caprolactam; N-vinylformamide; N,N-diallylacetamide; dimethyldiallyl ammonium halide; styrene sulfonic acid; or a quaternary salt derivative of acrylamide.
- the hydrophilic monomer comprises N,N-di
- the present invention provides a method of stabilizing a subterranean formation that comprises a shale.
- the method comprises contacting the subterranean formation that comprises the shale with a treatment fluid, the treatment fluid comprising a base fluid, and a hydrophilically modified polymer.
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer that comprises a polymer backbone, the polymer backbone comprising polar heteroatoms, wherein the hydrophobically modified polymer does not comprise polyoxyethylene.
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polyvinylamine, or a poly(vinylamine/vinyl alcohol).
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer formed from a reaction of a hydrophilic polymer and a hydrophobic compound, wherein the hydrophilic polymer comprises a polymer backbone and contains reactive amino groups as pendant groups or in the polymer backbone.
- the present invention provides a shale-inhibiting component that comprises a hydrophobically modified polymer formed from the polymerization reaction of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the hydrophilic monomer comprises N,N- dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl methacrylate; dimethylaminopropylmethacrylamide; vinyl amine; vinyl acetate; trimethylammoniumethyl methacrylate chloride; hydroxyethyl acrylate; vinyl sulfonic acid; vinyl phosphonic acid; vinyl caprolactam; N-vinylformamide; N,N-diallylacetamide; dimethyldiallyl ammonium halide; styrene sulfonic acid; or a quaternary salt derivative of acrylamide.
- the hydrophilic monomer comprises N,N- dimethylacrylamide; vinyl pyrrolidone; dimethylaminoethyl
- the present invention provides a shale-inhibiting component that comprises a hydrophilically modified polymer.
- a shale-inhibiting component that comprises a hydrophilically modified polymer.
- Fluid Sample No. 1 comprised 100% deionized water.
- the shale erosion was 100%.
- Fluid Sample No. 2 comprised deionized water and 1% of a hydrophilically modified polymer by weight of the deionized water.
- the hydrophilically modified polymer used was the reaction product of a polydimethylaminoethyl methacrylate with epichlorohydrin-terminated polyethyleneoxide methyl ether having a weight ratio of polydimethylaminoethyl methacrylate to epichlorohydrin-terminated polyethyleneoxide methyl ether of 3:1.
- the shale erosion was 33%.
- this example indicates, inter alia, that Fluid Sample No.
Abstract
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Applications Claiming Priority (2)
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CN106520085A (en) * | 2016-11-03 | 2017-03-22 | 中国石油大学(华东) | Dendritic polyether clay shale inhibitor and preparation method and application thereof |
CN106520085B (en) * | 2016-11-03 | 2018-06-26 | 中国石油大学(华东) | A kind of dendritic polyether shale inhibitor and preparation method and application |
CN110408371A (en) * | 2018-08-13 | 2019-11-05 | 中国地质大学(北京) | Application of the polyethyleneimine as shale control agent |
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US20040220058A1 (en) | 2004-11-04 |
US7741251B2 (en) | 2010-06-22 |
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