CN116064025A - Clean fracturing fluid thickener for low-permeability oil and gas field and preparation method thereof - Google Patents
Clean fracturing fluid thickener for low-permeability oil and gas field and preparation method thereof Download PDFInfo
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- salicylate
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- 239000012530 fluid Substances 0.000 title claims abstract description 52
- 239000002562 thickening agent Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000003112 inhibitor Substances 0.000 claims abstract description 49
- -1 ion salt Chemical class 0.000 claims abstract description 47
- 238000001179 sorption measurement Methods 0.000 claims abstract description 35
- 239000003085 diluting agent Substances 0.000 claims abstract description 19
- 230000002195 synergetic effect Effects 0.000 claims abstract description 19
- 239000003093 cationic surfactant Substances 0.000 claims abstract description 17
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 16
- 229960001860 salicylate Drugs 0.000 claims abstract description 12
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 25
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 24
- 235000019270 ammonium chloride Nutrition 0.000 claims description 19
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 13
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 230000035699 permeability Effects 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 claims description 6
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- BURBNIPKSRJAIQ-UHFFFAOYSA-N 2-azaniumyl-3-[3-(trifluoromethyl)phenyl]propanoate Chemical compound OC(=O)C(N)CC1=CC=CC(C(F)(F)F)=C1 BURBNIPKSRJAIQ-UHFFFAOYSA-N 0.000 claims description 4
- ABBQHOQBGMUPJH-UHFFFAOYSA-M Sodium salicylate Chemical compound [Na+].OC1=CC=CC=C1C([O-])=O ABBQHOQBGMUPJH-UHFFFAOYSA-M 0.000 claims description 4
- 229940063284 ammonium salicylate Drugs 0.000 claims description 4
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 claims description 4
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 claims description 4
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical compound [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 claims description 4
- 229960004025 sodium salicylate Drugs 0.000 claims description 4
- SZEMGTQCPRNXEG-UHFFFAOYSA-M trimethyl(octadecyl)azanium;bromide Chemical compound [Br-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C SZEMGTQCPRNXEG-UHFFFAOYSA-M 0.000 claims description 4
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims description 3
- 239000005695 Ammonium acetate Substances 0.000 claims description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 3
- DPUOLQHDNGRHBS-UHFFFAOYSA-N Brassidinsaeure Natural products CCCCCCCCC=CCCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-UHFFFAOYSA-N 0.000 claims description 3
- CXRFDZFCGOPDTD-UHFFFAOYSA-M Cetrimide Chemical compound [Br-].CCCCCCCCCCCCCC[N+](C)(C)C CXRFDZFCGOPDTD-UHFFFAOYSA-M 0.000 claims description 3
- URXZXNYJPAJJOQ-UHFFFAOYSA-N Erucic acid Natural products CCCCCCC=CCCCCCCCCCCCC(O)=O URXZXNYJPAJJOQ-UHFFFAOYSA-N 0.000 claims description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 3
- 235000019257 ammonium acetate Nutrition 0.000 claims description 3
- 229940043376 ammonium acetate Drugs 0.000 claims description 3
- 229960003237 betaine Drugs 0.000 claims description 3
- DPUOLQHDNGRHBS-KTKRTIGZSA-N erucic acid Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-KTKRTIGZSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- FRMWBRPWYBNAFB-UHFFFAOYSA-M potassium salicylate Chemical compound [K+].OC1=CC=CC=C1C([O-])=O FRMWBRPWYBNAFB-UHFFFAOYSA-M 0.000 claims description 3
- 229960003629 potassium salicylate Drugs 0.000 claims description 3
- CEYYIKYYFSTQRU-UHFFFAOYSA-M trimethyl(tetradecyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCC[N+](C)(C)C CEYYIKYYFSTQRU-UHFFFAOYSA-M 0.000 claims description 3
- RQKPEKWRVGXAPN-UHFFFAOYSA-N C(C=1C(O)=CC=CC1)(=O)[O-].[NH4+].C(C)O.C(C)O Chemical compound C(C=1C(O)=CC=CC1)(=O)[O-].[NH4+].C(C)O.C(C)O RQKPEKWRVGXAPN-UHFFFAOYSA-N 0.000 claims description 2
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 2
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 claims description 2
- 235000011056 potassium acetate Nutrition 0.000 claims description 2
- KJYRQFCLHZNIEP-UHFFFAOYSA-N [NH4+].C(C)O.C(C)O.C(C)O.C(C=1C(O)=CC=CC1)(=O)[O-] Chemical compound [NH4+].C(C)O.C(C)O.C(C)O.C(C=1C(O)=CC=CC1)(=O)[O-] KJYRQFCLHZNIEP-UHFFFAOYSA-N 0.000 claims 1
- 125000001453 quaternary ammonium group Chemical group 0.000 claims 1
- 239000004094 surface-active agent Substances 0.000 abstract description 43
- 230000006378 damage Effects 0.000 abstract description 27
- 238000004140 cleaning Methods 0.000 abstract description 12
- 239000003795 chemical substances by application Substances 0.000 abstract description 9
- 230000002401 inhibitory effect Effects 0.000 abstract description 8
- 239000012467 final product Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 8
- 238000011160 research Methods 0.000 description 4
- 239000000693 micelle Substances 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 230000003040 nociceptive effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000005320 surfactant adsorption Methods 0.000 description 2
- KBKGPMDADJLBEM-UHFFFAOYSA-N 1-(4-pentylphenyl)ethanone Chemical compound CCCCCC1=CC=C(C(C)=O)C=C1 KBKGPMDADJLBEM-UHFFFAOYSA-N 0.000 description 1
- 206010011416 Croup infectious Diseases 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 201000010549 croup Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 150000004668 long chain fatty acids Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
-
- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
-
- 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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Detergent Compositions (AREA)
Abstract
The invention relates to a clean fracturing fluid thickener for a low-permeability oil and gas field and a preparation method thereof. The thickener comprises a quaternary ammonium salt cationic surfactant, salicylate, inhibitor and diluent. The preparation method comprises the following steps: mixing a surfactant and a counter ion salt; adding adsorption inhibitor, synergistic inhibitor and diluent; mixing uniformly to obtain the final product. The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the cleaning fracturing fluid thickening agent, so that the damage rate is remarkably reduced compared with a cleaning fracturing fluid system without an adsorption inhibitor.
Description
Technical Field
The invention relates to the technical field of clean fracturing fluid preparation, in particular to a preparation method of a clean fracturing fluid thickener for a low-permeability oil and gas field.
Background
With the advancement of hydraulic fracturing technology, to achieve deep penetration of proppants away from the wellbore, high viscosity crosslinked fracturing fluids have been used abroad since the end of the 60 th 20 th century. Clean fracturing fluids containing viscoelastic surfactants (Viscoelastic Surfactant, VES for short) were developed abroad in the 90 s of the 20 th century. Generally, micelles formed by the surfactant in the aqueous solution are spherical and cannot thicken the solution, while micelles formed by the quaternary ammonium salt surfactant in the VES system are mainly earthworm-shaped or long round rod-shaped and are highly entangled with each other to form a reticular micelle, which is similar to a reticular structure formed by cross-linked long-chain polymers. Since the polymer is not contained in the slurry, the adsorption amount of residues on the proppant pack and the wall surface of the crack can be remarkably reduced, and the crack with high flow conductivity can be formed.
However, VES fracturing fluids are mainly composed of long-chain fatty amine derivative quaternary ammonium salt or long-chain fatty acid derivative quaternary ammonium salt surfactants, activators and electrolytes thereof, and the like. When the fracturing is finished, the clean fracturing fluid can be diluted by water or broken by oil, and the ground is reversely discharged after the broken gel. Because the quaternary ammonium salt with alkyl long chain is used in large amount, the quaternary ammonium salt can be chemically adsorbed with negative charges on the surface of the stratum hydration clay and adsorbed on the stratum, and the hydrophilicity of the quaternary ammonium salt is changed into lipophilicity, so that the Jack effect of the stratum mesoporous croup is enhanced, the diversion capacity of the bottom layer is reduced, and the permeability of the stratum is damaged. A great deal of researches show that the damage rate of the VES fracturing fluid system of the cationic surfactant is basically 10-20%, and the damage rate is reduced by more than half compared with that of the guanidine gum fracturing system, but the damage rate is still higher, so that the application of the VES fracturing fluid system of the cationic surfactant in low permeability oil and gas fields is limited. The basic principle of the injury is that the cationic surfactant is adsorbed on the surface of the reservoir rock, so that the wettability is changed, the porosity is reduced, and the flooding is not facilitated. Therefore, the invention introduces the cationic surfactant adsorption inhibitor into the VES fracturing fluid system of the traditional cationic surfactant, reduces the adsorption of the cationic surfactant adsorption inhibitor on the surface of the reservoir rock, and achieves the aim of reducing the damage to the permeability of the reservoir (research and application of the high-temperature resistant composite surfactant clean fracturing fluid system, construction and applicability research of the block oil and gas field, 2018, 25 (4): 537; VES-YF clean fracturing fluid, university school report of petrochemical industry, 2019, 32 (3): 66; research progress of the clean fracturing fluid ionic surfactant system, fine petrochemical industry progress, 2019, 13 (6): 38)
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a preparation method of a clean fracturing fluid thickening agent for a low-permeability oil and gas field, which further reduces the harmfulness of a cationic viscoelastic surfactant clean fracturing fluid system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the preparation method of the clean fracturing fluid thickener for the low-permeability oil and gas field comprises the following steps:
firstly, mixing a surfactant and a counter ion salt in a container according to the mass ratio of 2-3:1, wherein the surfactant is selected from industrial grade and above tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyl trimethylammonium chloride, tetradecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyl trimethylammonium bromide, erucic acid betaine and mixtures thereof, and the counter ion salt is selected from industrial grade and above sodium salicylate, potassium salicylate, ammonium salicylate, diethanol ammonium salicylate, triethanol ammonium sulfosalicylate and mixtures thereof;
secondly, adding an adsorption inhibitor which is 1-5% of the total mass of the surfactant and the counter ion salt into the container, wherein the adsorption inhibitor is selected from the group consisting of industrial-grade and above-purity polydimethyl-2-hydroxypropyl ammonium chloride, polydiethyl-2-hydroxypropyl ammonium chloride, polydiethoxy-2-hydroxypropyl ammonium chloride and mixtures thereof;
thirdly, adding a synergistic inhibitor which is 5-15% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is selected from industrial grade ammonium chloride, ammonium acetate, ammonium formate, potassium chloride, potassium acetate, potassium formate and mixtures thereof with purity above;
a fourth step of adding a diluent which is 50-100% of the total mass of the surfactant and the counter ion salt to the container, wherein the diluent is selected from isopropanol, ethanol, N-dimethylformamide and a mixture thereof with the purity of industrial grade or above;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the cleaning fracturing fluid thickening agent, the damage rate of 1.0-3.0% of the gel solution to the core after gel breaking is within 10%, and compared with a cleaning fracturing fluid system without the adsorption inhibitor, the damage rate is reduced by about half. The nociceptive properties were evaluated according to the fracturing fluid general purpose specifications (SYT 6376-2008).
Detailed Description
The invention is further illustrated by the following examples. It should be understood that the methods described in the examples of the present invention are only for illustrating the present invention, and not for limiting the present invention, and that simple modifications to the preparation methods of the present invention under the concept of the present invention are within the scope of the present invention as claimed.
Example 1:
firstly, mixing a surfactant and a counter ion salt in a container according to the mass ratio of 2:1, wherein the surfactant is a mixture of octadecyl trimethyl ammonium chloride and octadecyl trimethyl ammonium bromide which are chemically pure in the mass ratio of 1:1, and the counter ion salt is ammonium salicylate which is chemically pure;
a second step of adding an adsorption inhibitor, which is selected from industrial-grade polydimethyl-2-hydroxypropyl ammonium chloride, to the container in an amount of 1% by mass of the total of the surfactant and the counter ion salt;
thirdly, adding a synergistic inhibitor which is 15% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is selected from industrial ammonium chloride;
a fourth step of adding a diluent which is 50% of the total mass of the surfactant and the counter ion salt to the container, wherein the diluent is selected from industrial grade isopropanol;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the cleaning fracturing fluid thickening agent, the damage rate of 1.0% of the gel solution after gel breaking to the core is 7%, and compared with a cleaning fracturing fluid system without the adsorption inhibitor, the damage rate is reduced by 43%. The nociceptive properties were evaluated according to the fracturing fluid general purpose specifications (SYT 6376-2008).
Example 2:
firstly, mixing a surfactant and a counter ion salt in a container according to the mass ratio of 3:1, wherein the surfactant is a mixture of tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride and octadecyl trimethyl ammonium chloride with the mass ratio of 1:2:3 and the counter ion salt is a mixture of potassium salicylate and triethanolamine sulfosalicylate with the mass ratio of 3:1;
a second step of adding an adsorption inhibitor, which is selected from industrial-grade polydiethyl-2-hydroxypropyl ammonium chloride, to the container, wherein the adsorption inhibitor is 2% of the total mass of the surfactant and the counter ion salt;
thirdly, adding a synergistic inhibitor which is 15% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is selected from industrial grade ammonium acetate;
a fourth step of adding a diluent which is 80% of the total mass of the surfactant and the counter ion salt into the container, wherein the diluent is ethanol with chemical purity of industrial grade or above;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the thickener of the clean fracturing fluid, the damage rate of 2.0 percent of the gel solution to the core after gel breaking is 7.5 percent, the damage rate was reduced by 53% compared to a clean fracturing fluid system without adsorption inhibitor.
Example 3:
in the first step, surfactant and counter ion salt are mixed in a container according to the mass ratio of 2.5:1, the surfactant is a mixture of octadecyl trimethyl ammonium chloride and erucic acid betaine with a mass ratio of 5:1, and the counter ion salt is a mixture of sodium salicylate and triethanolamine salicylate with a mass ratio of 3:1;
a second step of adding an adsorption inhibitor which is 3% of the total mass of the surfactant and the counter ion salt to the container, wherein the adsorption inhibitor is selected from industrial grade polydiethoxy-2-hydroxypropyl ammonium chloride;
thirdly, adding a synergistic inhibitor which is 10% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is chemically pure potassium chloride;
fourth, adding 50% of the total mass of the surfactant and the counter ion salt into the container, wherein the diluent is analytically pure N, N-dimethylformamide;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the cleaning fracturing fluid thickening agent, the damage rate of the 3.0% of the gel solution to the core after gel breaking is 8.1%, and compared with a cleaning fracturing fluid system without the adsorption inhibitor, the damage rate is reduced by 44%.
Example 4:
firstly, mixing a surfactant and a counter ion salt in a container according to the mass ratio of 2.8:1, wherein the surfactant is a mixture of tetradecyl trimethyl ammonium bromide and octadecyl trimethyl ammonium bromide with the mass ratio of 1:3, and the counter ion salt is analytically pure diethanolammonium salicylate;
secondly, adding an adsorption inhibitor accounting for 5% of the total mass of the surfactant and the counter ion salt into the container, wherein the adsorption inhibitor is a mixture of polydimethyl-2-hydroxypropyl ammonium chloride and polydiethyl-2-hydroxypropyl ammonium chloride with the mass ratio of 1:1;
thirdly, adding a synergistic inhibitor which is 5% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is a mixture of industrial grade ammonium chloride and potassium chloride with the mass ratio of 5:1;
fourthly, adding a diluent which is 100 percent of the total mass of the surfactant and the counter ion salt into the container, wherein the diluent is a mixture of industrial grade isopropanol and N, N-dimethylformamide in a mass ratio of 1:1;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the cleaning fracturing fluid thickening agent, the damage rate of 1.5% of the gel solution after gel breaking to the core is 6.1%, and compared with a cleaning fracturing fluid system without the adsorption inhibitor, the damage rate is reduced by 55%.
Example 5:
firstly, mixing a surfactant and a counter ion salt in a container according to the mass ratio of 2.2:1, wherein the surfactant is chemically pure octadecyl trimethyl ammonium chloride, and the counter ion salt is chemically pure ammonium salicylate;
a second step of adding an adsorption inhibitor, which is selected from industrial-grade polydimethyl-2-hydroxypropyl ammonium chloride, to the container in an amount of 3% by mass of the total of the surfactant and the counter ion salt;
thirdly, adding a synergistic inhibitor which is 10% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is a mixture of industrial-grade ammonium chloride and potassium formate with the mass ratio of 1:3;
fourthly, adding a diluent which is 50% of the total mass of the surfactant and the counter ion salt into the container, wherein the diluent is industrial grade ethanol and N, N-dimethylformamide with the mass ratio of 1:3;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the thickener of the clean fracturing fluid, the damage rate of the gel solution after gel breaking of 2.0% of the agent to the core is 5.5%, and compared with the clean fracturing fluid system without the adsorption inhibitor, the damage rate is reduced by 63%.
Example 6:
firstly, mixing a surfactant and a counter ion salt in a container according to the mass ratio of 2.4:1, wherein the surfactant is selected from industrial-grade cetyltrimethylammonium chloride, and the counter ion salt is selected from industrial-grade sodium salicylate;
secondly, adding an adsorption inhibitor accounting for 2% of the total mass of the surfactant and the counter ion salt into the container, wherein the adsorption inhibitor is a mixture of polydimethyl-2-hydroxypropyl ammonium chloride and polydiethoxy-2-hydroxypropyl ammonium chloride with the mass ratio of 1:1;
thirdly, adding a synergistic inhibitor which is 10% of the total mass of the surfactant and the counter ion salt into the container, wherein the synergistic inhibitor is a mixture of chemically pure potassium chloride and potassium formate in a mass ratio of 1:3;
fourth, adding a diluent which is 100% of the total mass of the surfactant and the counter ion salt into the container, wherein the diluent is chemically pure isopropanol;
and fifthly, uniformly stirring and mixing the mixture to obtain the clean fracturing fluid thickening agent with the damage caused by the micro-damage.
The agent for inhibiting the adsorption of the long-chain alkyl quaternary ammonium salt is added into the cleaning fracturing fluid thickening agent, the damage rate of 1.5% of the gel solution after gel breaking to the core is 7.2%, and compared with a cleaning fracturing fluid system without the adsorption inhibitor, the damage rate is reduced by 40%.
Claims (8)
1. The clean fracturing fluid thickener for the low-permeability oil and gas field is characterized by comprising the following components: quaternary ammonium cationic surfactant, salicylate, inhibitor and diluent.
2. The clean fracturing fluid thickener for low permeability oil and gas fields of claim 1, wherein: wherein the quaternary ammonium salt cationic surfactant is selected from one or more of industrial grade and above pure tetradecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium bromide and erucic acid betaine; the salicylate is selected from one or more of sodium salicylate, potassium salicylate, ammonium salicylate, diethanol ammonium salicylate, triethanol ammonium salicylate and triethanol ammonium sulfosalicylate with the purity of the industrial grade or above; the inhibitors include adsorption inhibitors and synergistic inhibitors; the diluent is selected from one or more of industrial grade isopropanol, ethanol and N, N-dimethylformamide with purity above.
3. The clean fracturing fluid thickener for low permeability oil and gas fields of claim 2, wherein: the adsorption inhibitor is selected from one or more of industrial grade and above-purity polydimethyl-2-hydroxypropyl ammonium chloride, polydiethyl-2-hydroxypropyl ammonium chloride and polydiethoxy-2-hydroxypropyl ammonium chloride; the synergistic inhibitor is one or more selected from industrial grade ammonium chloride, ammonium acetate, ammonium formate, potassium chloride, potassium acetate and potassium formate with purity above.
4. A clean fracturing fluid thickener for low permeability oil and gas fields according to claim 1 or 2, characterized in that: the mass ratio of the quaternary ammonium salt cationic surfactant to the salicylate is 1:1-3:1; the adsorption inhibitor is 1-5% of the total mass of the quaternary ammonium salt cationic surfactant and salicylate; the synergistic inhibitor is 5-20% of the total mass of the quaternary ammonium salt cationic surfactant and salicylate; the diluent is 50-100% of the total mass of the quaternary ammonium salt cationic surfactant and the salicylate.
5. A method for preparing the clean fracturing fluid thickener for low permeability oil and gas fields as claimed in any one of claims 1 to 3, comprising the steps of:
1) Mixing quaternary ammonium salt cationic surfactant and salicylate in the mass ratio of 1-3 to 1 in the container;
2) Adding adsorption inhibitor of which the total mass is 1-5% of that of quaternary ammonium salt cationic surfactant and salicylate into the container;
3) Adding a synergistic inhibitor which is 5-20% of the total mass of the quaternary ammonium salt cationic surfactant and the salicylate into the container;
4) Adding a diluent which is 50-100% of the total mass of the quaternary ammonium salt cationic surfactant and the salicylate into the container;
5) And (3) uniformly stirring and mixing the mixture to obtain the damage-free clean fracturing fluid thickening agent.
6. The clean fracturing fluid thickener for the low-permeability oil and gas field is characterized in that: a method of claim 4.
7. Use of the clean fracturing fluid thickener for low permeability oil and gas fields as claimed in claims 1 to 3 or claim 6 in petrochemical industry.
8. Use according to claim 7, characterized in that: use in clean fracturing fluids for low permeability oil and gas fields.
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Citations (5)
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| CN101362943A (en) * | 2008-09-15 | 2009-02-11 | 青岛生物能源与过程所 | Preparation of novel thermal resistant and shearing resistant clean fracturing fluid thickener by long chain quaternary ammonium salt containing 18-40 carbon number |
| CN101775276A (en) * | 2010-02-02 | 2010-07-14 | 陕西科技大学 | Medium-temperature and high-temperature clean fracturing fluid and preparation method thereof |
| CN102031102A (en) * | 2010-11-18 | 2011-04-27 | 陕西延长石油(集团)有限责任公司研究院 | Preparation method and fracturing construction method of locally and continuously mixed clean fracturing fluid additive |
| CN104710974A (en) * | 2015-04-03 | 2015-06-17 | 杨县超 | Oligomer surfactant clean fracturing fluid and preparation method thereof |
| CN105419767A (en) * | 2014-09-23 | 2016-03-23 | 中国石油化工股份有限公司 | Novel cleaning fracturing fluid system and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101362943A (en) * | 2008-09-15 | 2009-02-11 | 青岛生物能源与过程所 | Preparation of novel thermal resistant and shearing resistant clean fracturing fluid thickener by long chain quaternary ammonium salt containing 18-40 carbon number |
| CN101775276A (en) * | 2010-02-02 | 2010-07-14 | 陕西科技大学 | Medium-temperature and high-temperature clean fracturing fluid and preparation method thereof |
| CN102031102A (en) * | 2010-11-18 | 2011-04-27 | 陕西延长石油(集团)有限责任公司研究院 | Preparation method and fracturing construction method of locally and continuously mixed clean fracturing fluid additive |
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