CN116103031A - High Wen Wenlun glue fracturing fluid and preparation method thereof - Google Patents
High Wen Wenlun glue fracturing fluid and preparation method thereof Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000003292 glue Substances 0.000 title claims abstract description 20
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003381 stabilizer Substances 0.000 claims abstract description 24
- 239000004927 clay Substances 0.000 claims abstract description 20
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 16
- 239000003899 bactericide agent Substances 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000006266 etherification reaction Methods 0.000 claims abstract description 5
- -1 0.3-0.5% Substances 0.000 claims abstract description 3
- 239000000654 additive Substances 0.000 claims abstract description 3
- 230000000996 additive effect Effects 0.000 claims abstract description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 36
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 20
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 12
- 229930195725 Mannitol Natural products 0.000 claims description 12
- 239000000594 mannitol Substances 0.000 claims description 12
- 235000010355 mannitol Nutrition 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims description 11
- 102000008186 Collagen Human genes 0.000 claims description 9
- 108010035532 Collagen Proteins 0.000 claims description 9
- 229920002310 Welan gum Polymers 0.000 claims description 9
- 229920001436 collagen Polymers 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000004971 Cross linker Substances 0.000 claims description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- BJAARRARQJZURR-UHFFFAOYSA-N trimethylazanium;hydroxide Chemical compound O.CN(C)C BJAARRARQJZURR-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- PUVAFTRIIUSGLK-UHFFFAOYSA-M trimethyl(oxiran-2-ylmethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1CO1 PUVAFTRIIUSGLK-UHFFFAOYSA-M 0.000 claims description 7
- JUXXCHAGQCBNTI-UHFFFAOYSA-N 1-n,1-n,2-n,2-n-tetramethylpropane-1,2-diamine Chemical compound CN(C)C(C)CN(C)C JUXXCHAGQCBNTI-UHFFFAOYSA-N 0.000 claims description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical group [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 6
- 229910021538 borax Inorganic materials 0.000 claims description 6
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 6
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000176 sodium gluconate Substances 0.000 claims description 6
- 229940005574 sodium gluconate Drugs 0.000 claims description 6
- 235000012207 sodium gluconate Nutrition 0.000 claims description 6
- 239000004328 sodium tetraborate Substances 0.000 claims description 6
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- YLOCGHYTXIINAI-XKUOMLDTSA-N (2s)-2-amino-3-(4-hydroxyphenyl)propanoic acid;(2s)-2-aminopentanedioic acid;(2s)-2-aminopropanoic acid;(2s)-2,6-diaminohexanoic acid Chemical compound C[C@H](N)C(O)=O.NCCCC[C@H](N)C(O)=O.OC(=O)[C@@H](N)CCC(O)=O.OC(=O)[C@@H](N)CC1=CC=C(O)C=C1 YLOCGHYTXIINAI-XKUOMLDTSA-N 0.000 claims description 4
- 102000016726 Coat Protein Complex I Human genes 0.000 claims description 4
- 108010092897 Coat Protein Complex I Proteins 0.000 claims description 4
- 229960000583 acetic acid Drugs 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 4
- 239000012362 glacial acetic acid Substances 0.000 claims description 4
- 235000011187 glycerol Nutrition 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 claims description 4
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 229920002907 Guar gum Polymers 0.000 abstract description 2
- 239000000665 guar gum Substances 0.000 abstract description 2
- 229960002154 guar gum Drugs 0.000 abstract description 2
- 235000010417 guar gum Nutrition 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 238000010008 shearing Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 2
- 239000003002 pH adjusting agent Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 150000002357 guanidines Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 238000004626 scanning electron microscopy Methods 0.000 description 1
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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
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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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
- C09K8/84—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
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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
- C09K8/84—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
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Jellies, Jams, And Syrups (AREA)
Abstract
The invention discloses a high Wen Wenlun glue fracturing fluid which comprises the following raw materials in percentage by weight as per 100 percent: modified Wen Lunjiao, 0.2-0.4%, bactericide, 0.05-0.2%, demulsification and cleanup additive, 0.3-0.5%, clay stabilizer, 0.3-0.5%, high-temperature cross-linking agent, 0.1-0.3% and the balance of water; the modified Wen Lunjiao is prepared by an alkalization reaction and an etherification reaction. Meanwhile, the invention also discloses a preparation method of the fracturing fluid. The high Wen Wenlun gum fracturing fluid provided by the invention solves the problems of poor temperature resistance, high cost and the like of the guar gum fracturing fluid in high-temperature reservoir reconstruction.
Description
Technical Field
The invention belongs to the technical field of petrochemical industry, and particularly relates to a high Wen Wenlun glue fracturing fluid and a preparation method thereof.
Background
In recent years, a batch of deep and ultra-deep hydrocarbon reservoirs are discovered and successively put into development in China, and are influenced by special geological conditions, and the hydrocarbon reservoirs are characterized by the reality that the reservoirs are deep in burial, high in stratum temperature, large in production layer thickness, serious in heterogeneity, low in natural casting rate and easy to cause reservoir damage, so that exploration and development difficulties are high, technical requirements are high, cost is high, and economic benefit is poor. By 2030, domestic unconventional oil and gas production is expected to be 20% and 50% of total oil and gas production, respectively.
The absence of reservoir reformation engineering technology has not come in the new era of unconventional oil and gas, and the reservoir reformation technology has become one of three key engineering technologies which are in combination with drilling and geophysical prospecting. The fracturing fluid is a working fluid in the hydraulic fracturing transformation process of the hydrocarbon reservoir, plays roles of transmitting pressure, making a joint and carrying propping agents into the joint, and the quality of the fracturing fluid is an important factor related to success and failure of fracturing construction and influencing the post-fracturing yield increasing effect, so that the improvement of the performance is a subject of the research. For deep hydrocarbon reservoirs, the fracturing well Duan Shen and the stratum are high in temperature, so that the fracturing fluid is required to have good temperature resistance, and the high-shear time is increased due to longer flowing pipelines, and the required fracturing fluid is required to have good viscosity recovery at high temperature and high shear, so that the joint making and sand carrying capacity is ensured. Chinese patent CN 109439310A discloses a high temperature guanidine gum fracturing fluid, which adopts modified guanidine gum, while meeting the reservoir reformation process requirement at 180 ℃, it must contain a temperature stabilizer and a pH adjuster, and when the temperature stabilizer is not contained, the fracturing fluid cannot meet the requirement of high temperature resistance.
Aiming at deep and ultra-deep oil and gas reservoirs, a fracturing fluid system with low friction, low fluid loss, good temperature resistance and shearing resistance, quick gel breaking, easy flowback, compatibility with stratum rock and fluid and low cost is urgently needed. The high-quality fracturing fluid system is a new 'force point' of reservoir reconstruction engineering technology, and is an important engineering technology tool for guaranteeing national oil and gas resource production bottom lines and guaranteeing firm-end energy rice bowls.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high Wen Wenlun gel fracturing fluid and a preparation method thereof, and aims to solve the problems of poor temperature resistance, large filtration loss, high risk and the like of the conventional guanidine gel fracturing fluid in reservoir reconstruction, and provide technical support for reservoir production increasing operation of deep wells and ultra-deep wells.
The high Wen Wenlun glue fracturing fluid consists of the following raw materials in percentage by weight as per 100 percent by weight: modified Wen Lunjiao, 0.2-0.4%, bactericide, 0.05-0.2%, demulsification and cleanup additive, 0.3-0.5%, clay stabilizer, 0.3-0.5%, high-temperature cross-linking agent, 0.1-0.3% and the balance of water;
the modified Wen Lunjiao is prepared by the following method:
(a) Alkalization reaction: mixing Wen Lun collagen powder, acetone, trimethylammonium hydroxide and silicon dioxide, and stirring at 30-40deg.C for 25-30min;
(b) Etherification reaction: adding 2, 3-epoxypropyl trimethyl ammonium chloride into the alkalified solution, etherifying for 5-6h at 45-50 ℃ under the condition of introducing nitrogen, taking out, cooling to room temperature, washing with ethanol, discharging, adding glacial acetic acid to adjust the pH to be neutral, centrifuging with ethanol, washing with the ethanol, drying in vacuum, and grinding to obtain the modified Wen Lunjiao.
Preferably, the mass ratio of the Wen Lun collagen powder to the acetone to the trimethylammonium hydroxide to the silicon dioxide is (5-10): (20-25): (2-5): (0.5-1); the mass ratio of the 2, 3-epoxypropyl trimethyl ammonium chloride to the alkalized solution is 8-12%.
Preferably, the high temperature crosslinking agent is prepared by the following method:
(A) Preparation of crosslinker A: mixing sodium tetraborate, glycerol, sodium hydroxide, sodium gluconate and water, reacting at 60-65 ℃ for 1.5-2 hours, adding mannitol, and continuously reacting at 70-80 ℃ for 5-6 hours to obtain a cross-linking agent A;
(B) Preparation of crosslinker B: zirconium dioxide, glycerol, citric acid, tetramethyl propylene diamine and water are mixed, reacted for 30-40min at 25 ℃, then sodium hydroxide is added, after 2-3h of reaction at 50-60 ℃, mannitol is added, and the reaction is continued for 5h at 70-80 ℃ to obtain a cross-linking agent B;
(C) Preparation of high-temperature cross-linking agent: the cross-linking agent A and the cross-linking agent B are uniformly mixed according to the mass ratio of (0.1-0.25) to 1 and react for 2-4 hours at 50-60 ℃ to obtain the high-temperature cross-linking agent.
Preferably, in the step (A), the mass ratio of sodium tetraborate, glycerol, sodium hydroxide, sodium gluconate, water and mannitol is 5:3:0.5:10:5: (5-10); in the step (B), the mass ratio of zirconium dioxide, glycerol, citric acid, tetramethyl propylene diamine, water, sodium hydroxide and mannitol is (0.5-1) to 2:2 (1-2) to (5-6): (2-5): (10-15).
Preferably, the bactericide is an aqueous solution of dodecyl dimethyl benzyl ammonium chloride.
Preferably, the mass concentration of the dodecyl dimethyl benzyl ammonium chloride aqueous solution is 5-8%.
Preferably, the demulsification and drainage aid is water, fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether and isopropanol according to the mass ratio of (85-92): (0.05-0.1): (3-5): (5-7) a mixture.
Preferably, the clay stabilizer is an organic clay stabilizer COP-1 produced by Chuanqing drilling.
The preparation method of the high Wen Wenlun glue fracturing fluid comprises the following steps:
(1) And (3) preparing a base solution: adding modified Wen Lunjiao into water under stirring, stirring for 15-20min, sequentially adding bactericide, demulsification and drainage aid and clay stabilizer, stirring for 2-3 hr to obtain fracturing fluid base solution, and standing at 30deg.C for 3 hr;
(2) Preparation of fracturing fluid: and adding the high-temperature cross-linking agent into the base solution after standing, and stirring for 1-3min to form the high Wen Wenlun glue fracturing fluid.
The invention has the advantages that:
1. the preparation method of the high Wen Wenlun glue fracturing fluid provided by the invention is simple, convenient and quick, and the comprehensive performance meets the reservoir reconstruction process requirement under the condition of 150 ℃ according to the SY/T5107-2016 water-based fracturing fluid evaluation method, and the system is at 150 ℃ for 170s -1 Continuously shearing for 90min, wherein the viscosity is more than 50mPa.s; the requirements of the high-temperature reservoir transformation process can be met without adding a temperature stabilizer and a pH regulator;
2. the high Wen Wenlun gum fracturing fluid solves the problems of poor temperature resistance, high cost and the like of the guar gum fracturing fluid in high-temperature reservoir reconstruction, fills up the blank of preparing polysaccharide gum in the high-temperature well fracturing fluid technology, realizes localization of the high Wen Wenlun gum fracturing fluid, and reduces the production cost;
3. the high Wen Wenlun glue fracturing fluid provided by the invention is suitable for the high-temperature deep well yield increase reconstruction of the reservoir temperature not less than 150 ℃, and along with the increase of the oil gas resource demand, the deep well and ultra-deep well reservoir reconstruction of each oil field is continuously and deeply performed, and the high Wen Wenlun glue fracturing fluid has a wide application prospect;
4. the trimethyl ammonium hydroxide, silicon dioxide and 2, 3-epoxypropyl trimethyl ammonium chloride added during the modification of Wen Lunjiao effectively change the network space structure of Wen Lunjiao, so that the prepared fracturing fluid has better temperature resistance.
Drawings
FIG. 1 is a scanning electron microscope image of a base solution obtained by unmodified Wen Lunjiao;
FIG. 2 is a scanning electron microscope image of the base liquid obtained by modification Wen Lunjiao;
FIG. 3 is a scanning electron microscope image of a crosslinked fracturing fluid;
FIG. 4 is a graph showing the temperature and shear resistance of the high temperature welan gum fracturing fluid of example 1;
FIG. 5 is a graph showing the temperature and shear resistance of the high temperature welan gum fracturing fluid of example 2;
FIG. 6 is a comparison of the temperature and shear resistance of the fracturing fluids of comparative example 1 and example 5 Wen Lunjiao;
FIG. 7 is a graph showing the temperature and shear resistance of the fracturing fluid of comparative example 2;
FIG. 8 is a graph showing the temperature and shear resistance of the fracturing fluid of comparative example 3.
Detailed Description
Example 1
1. The high Wen Wenlun glue fracturing fluid consists of the following raw materials in percentage by weight as per 100 percent by weight: modified Wen Lunjiao 0.25.25%, bactericide 0.1%, demulsification and drainage aid 0.3%, clay stabilizer 0.3%, high-temperature cross-linking agent 0.2% and the balance of water;
wherein the modification Wen Lunjiao is prepared by the following method:
(a) Alkalization reaction: mixing Wen Lun collagen powder, acetone, trimethylammonium hydroxide and silicon dioxide according to a ratio of 5:20:2:0.5, and stirring for 30min at 30 ℃ at a stirring rate of 1000 r/min;
(b) Etherification reaction: adding 2, 3-epoxypropyl trimethyl ammonium chloride accounting for 8 percent of the weight of the alkalified solution into the alkalified solution, etherifying for 5 hours at 45 ℃ under the condition of introducing nitrogen, taking out, cooling to room temperature, washing and discharging with 80 percent ethanol, adding glacial acetic acid to adjust the pH value to be neutral, centrifuging and washing with 80 percent ethanol, drying in vacuum at 50 ℃ and grinding to obtain modified Wen Lunjiao;
the high-temperature cross-linking agent is prepared by the following method:
(A) Preparation of crosslinker A: mixing 5 parts of sodium tetraborate, 3 parts of glycerol, 0.5 part of sodium hydroxide, 10 parts of sodium gluconate and 5 parts of water according to parts by weight, reacting for 2 hours at 60 ℃, adding 5 parts of mannitol, and continuously reacting for 5 hours at 80 ℃ to obtain a cross-linking agent A;
(B) Preparation of crosslinker B: mixing 0.5 part of zirconium dioxide, 2 parts of glycerol, 2 parts of citric acid, 1 part of tetramethyl propylene diamine and 5 parts of water according to parts by weight, reacting for 30min at 25 ℃, adding 2 parts of sodium hydroxide, reacting for 2h at 60 ℃, adding 10 parts of mannitol, and continuing to react for 5h at 80 ℃ to obtain a cross-linking agent B;
(C) Preparation of high-temperature cross-linking agent: uniformly mixing the cross-linking agent A and the cross-linking agent B according to the mass ratio of 0.1:1, and reacting for 4 hours at 50 ℃ to obtain the high-temperature cross-linking agent;
the bactericide is 5wt% of dodecyl dimethyl benzyl ammonium chloride aqueous solution;
the demulsification and drainage assisting agent is water, fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether and isopropanol, and the mass ratio is 85:0.05:3: 5.
The clay stabilizer is organic clay stabilizer COP-1 produced by Chuanqing drilling;
2. the preparation method of the high Wen Wenlun glue fracturing fluid comprises the following steps:
(1) And (3) preparing a base solution: adding modified Wen Lunjiao into water under stirring, stirring for 15min, sequentially adding bactericide, demulsification and drainage aid and clay stabilizer, stirring for 2.5h to obtain fracturing fluid base fluid, and standing at 30deg.C for 3h;
(2) Preparation of fracturing fluid: and adding a high-temperature cross-linking agent into the base solution after standing, and stirring for 3min to form the high Wen Wenlun glue fracturing fluid which can be hung.
Example 2
The high Wen Wenlun glue fracturing fluid consists of the following raw materials in percentage by weight as per 100 percent by weight: modified Wen Lunjiao 0.25.25%, bactericide 0.1%, demulsification and drainage aid 0.3%, clay stabilizer 0.3%, high-temperature cross-linking agent 0.3% and the balance of water;
otherwise, the same as in example 1 was conducted.
Example 3
1. The high Wen Wenlun glue fracturing fluid consists of the following raw materials in percentage by weight as per 100 percent by weight: modified Wen Lunjiao 0.2.2%, bactericide 0.05%, demulsification and drainage aid 0.4%, clay stabilizer 0.4%, high-temperature cross-linking agent 0.1% and the balance of water;
otherwise, the same as in example 1 was conducted.
Example 4
1. The high Wen Wenlun glue fracturing fluid consists of the following raw materials in percentage by weight as per 100 percent by weight: modified Wen Lunjiao 0.4.4%, bactericide 0.2%, demulsification and drainage aid 0.5%, clay stabilizer 0.5%, high-temperature cross-linking agent 0.1% and the balance of water;
wherein the modification Wen Lunjiao is prepared by the following method:
(a) Alkalization reaction: mixing Wen Lun collagen powder, acetone, trimethylammonium hydroxide and silicon dioxide according to a ratio of 10:25:5:1, and stirring at 40 ℃ for 25min at a stirring rate of 1000 r/min;
(b) Etherification reaction: adding 2, 3-epoxypropyl trimethyl ammonium chloride accounting for 12 percent of the weight of the alkalified solution into the alkalified solution, etherifying for 6 hours at 50 ℃ under the condition of introducing nitrogen, taking out, cooling to room temperature, washing and discharging with 80 percent ethanol, adding glacial acetic acid to adjust the pH value to be neutral, centrifuging and washing with 80 percent ethanol, drying in vacuum at 50 ℃ and grinding to obtain modified Wen Lunjiao;
the high-temperature cross-linking agent is prepared by the following method:
(A) Preparation of crosslinker A: mixing 5 parts of sodium tetraborate, 3 parts of glycerol, 0.5 part of sodium hydroxide, 10 parts of sodium gluconate and 5 parts of water according to parts by weight, reacting for 1.5 hours at 65 ℃, adding 10 parts of mannitol, and continuously reacting for 6 hours at 70 ℃ to obtain a cross-linking agent A;
(B) Preparation of crosslinker B: mixing 1 part of zirconium dioxide, 2 parts of glycerol, 2 parts of citric acid, 2 parts of tetramethyl propylene diamine and 6 parts of water according to parts by weight, reacting for 40min at 25 ℃, adding 5 parts of sodium hydroxide, reacting for 3h at 50 ℃, adding 15 parts of mannitol, and continuously reacting for 5h at 70 ℃ to obtain a cross-linking agent B;
(C) Preparation of high-temperature cross-linking agent: uniformly mixing the cross-linking agent A and the cross-linking agent B according to the mass ratio of 0.25:1, and reacting for 2 hours at 60 ℃ to obtain the high-temperature cross-linking agent;
the bactericide is 8wt% of dodecyl dimethyl benzyl ammonium chloride aqueous solution;
the demulsification and drainage assisting agent is water, fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether and isopropanol according to the mass ratio of 92:0.1:5: 7.
The clay stabilizer is organic clay stabilizer COP-1 produced by Chuanqing drilling;
2. the preparation method of the high Wen Wenlun glue fracturing fluid comprises the following steps:
(1) And (3) preparing a base solution: adding modified Wen Lunjiao into water under stirring, stirring for 20min, sequentially adding bactericide, demulsification and drainage aid and clay stabilizer, stirring for 3h to obtain fracturing fluid base fluid, and standing at 30deg.C for 3h;
(2) Preparation of fracturing fluid: and adding a high-temperature cross-linking agent into the base solution after standing, and stirring for 1min to form the high Wen Wenlun glue fracturing fluid which can be hung.
Example 5
The high Wen Wenlun glue fracturing fluid consists of the following raw materials in percentage by weight as per 100 percent by weight: modified Wen Lunjiao 0.2.2%, bactericide 0.1%, demulsification and drainage aid 0.3%, clay stabilizer 0.3%, high-temperature cross-linking agent 0.2% and the balance of water;
otherwise, the same as in example 1 was conducted.
Comparative example 1
Wen Lunjiao is unmodified and otherwise corresponds to example 5.
Comparative example 2
The procedure of example 5 was repeated except that no silica was added during the modification Wen Lunjiao.
Comparative example 3
No temperature stabilizer or pH adjuster was added based on example 1 of patent CN 109439310A.
Performance detection
1. Scanning electron microscope
Scanning electron microscopy was performed on the base fluid obtained in step (1) in comparative example 1 (i.e., the base fluid obtained in unmodified Wen Lunjiao), the base fluid obtained in step (1) in example 5, and the fracturing fluid obtained in step (2) in example 5, respectively, and the results are shown in fig. 1, fig. 2, and fig. 3, respectively.
1-2, the microstructure of the base liquid obtained by unmodified Wen Lunjiao shows a loose small framework structure, and the surface roughness is uneven; the microstructure of the base liquid prepared by the modified Wen Lunjiao is obviously wrapped with a large framework structure, and the surfaces of the structures are uniformly and internally connected in a staggered manner in a sheet-shaped network.
As can be seen from fig. 3, the space structure of Yu Yuanji solution, in which the whole space of the cavity is small, in the network structure of the fracturing fluid after the crosslinking agent is added, proves that the crosslinking agent lengthens the crosslinking distance and strengthens the crosslinking capability.
2. Temperature-resistant and shear-resistant performance detection
The temperature and shear resistance of the gel fracturing fluid is measured by using a Haake RS6000 rotational rheometer, and the specific steps are as follows:
2.1 The fracturing fluid prepared in example 1 was used at 30-150℃for 170s -1 The relationship between the shear time and viscosity of Wen Lunjiao fracturing fluid was examined below and is shown in fig. 4. As can be seen from fig. 4, the shearing time is 40 minutes, the shearing viscosity of the fracturing fluid is 500mpa.s at 150 ℃, the shearing viscosity is basically maintained at 50mpa.s after Wen Lunjiao shearing along with the prolongation of the shearing time after 150 ℃, and the modified Wen Lunjiao as the high-temperature well fracturing fluid thickening agent can completely meet the requirement of the fracturing construction on the viscosity.
2.2 Using the fracturing fluid prepared in example 2, when the Cross-linking ratio was changed, the temperature was between 30℃and 160℃for 170s -1 The relationship between the shear time and viscosity of Wen Lunjiao fracturing fluid was examined below and shown in fig. 5. As shown in fig. 5, the shearing time is 20 minutes, the shearing viscosity of the fracturing fluid is 600mpa.s at 120 ℃, and the viscosity of the fracturing fluid is 100mpa.s after being sheared at the temperature of Wen Lunjiao at 40 minutes and 150 ℃ along with the prolonged shearing time, which indicates that the modified Wen Lunjiao serving as the high-temperature well fracturing fluid thickening agent can completely meet the requirement of the fracturing construction on the viscosity.
2.3 fracturing fluids prepared in example 5 and comparative example 1, comparative example 2 and comparative example 3 were used for 170s at different simulated reservoir temperatures -1 The viscosity was measured by continuous shear using a Haake RS6000 rotational rheometer.
The results of the tests of example 5 and comparative example 1 are shown in FIG. 6. As can be seen from FIG. 6, after the modified Wen Lunjiao provided by the invention is added into the fracturing fluid, the fracturing fluid is used for 170s at 150 DEG C -1 The viscosity was maintained at 50mPa.S or more at continuous shearing for 90min, which is the viscosity of comparative example 1 (fracturing fluid without modification Wen Lunjiao) under the same experimental conditionsAnd 2 times, the quality index of the fracturing fluid is met.
The results of the test of comparative example 2 are shown in FIG. 7. As can be seen from FIG. 7, if silica is not added during the modification, the resulting fracturing fluid is at 150℃for 170s -1 The viscosity at continuous shear for 90min was essentially 25mPa.S, which is less than the viscosity of example 5 of the invention under comparable test conditions.
The results of the test of comparative example 3 are shown in FIG. 8. As can be seen from FIG. 8, the resulting fracturing fluid was prepared at 140℃for 170s -1 The viscosity is basically 25mPa.S when continuously sheared for 90min, and the temperature and shearing resistance is far smaller than that of the invention.
Claims (9)
1. A high Wen Wenlun gum fracturing fluid, which is characterized in that: the material consists of the following raw materials in percentage by weight, calculated as 100 percent by weight: modified Wen Lunjiao, 0.2-0.4%, bactericide, 0.05-0.2%, demulsification and cleanup additive, 0.3-0.5%, clay stabilizer, 0.3-0.5%, high-temperature cross-linking agent, 0.1-0.3% and the balance of water;
the modified Wen Lunjiao is prepared by the following method:
(a) Alkalization reaction: mixing Wen Lun collagen powder, acetone, trimethylammonium hydroxide and silicon dioxide, and stirring at 30-40deg.C for 25-30min;
(b) Etherification reaction: adding 2, 3-epoxypropyl trimethyl ammonium chloride into the alkalified solution, etherifying for 5-6h at 45-50 ℃ under the condition of introducing nitrogen, taking out, cooling to room temperature, washing with ethanol, discharging, adding glacial acetic acid to adjust the pH to be neutral, centrifuging with ethanol, washing with the ethanol, drying in vacuum, and grinding to obtain the modified Wen Lunjiao.
2. The high temperature welan fracturing fluid of claim 1, wherein: the mass ratio of the Wen Lun collagen powder to the acetone to the trimethylammonium hydroxide to the silicon dioxide is (5-10), the mass ratio of the collagen powder to the acetone to the trimethylammonium hydroxide to the silicon dioxide is (20-25), the mass ratio of the collagen powder to the silicon dioxide to the acetone to the silicon dioxide is (2-5), and the mass ratio of the collagen powder to the silicon dioxide is (0.5-1); the mass ratio of the 2, 3-epoxypropyl trimethyl ammonium chloride to the alkalized solution is 8-12%.
3. The high temperature welan fracturing fluid according to claim 1 or 2, characterized in that: the high-temperature cross-linking agent is prepared by the following method:
(A) Preparation of crosslinker A: mixing sodium tetraborate, glycerol, sodium hydroxide, sodium gluconate and water, reacting at 60-65 ℃ for 1.5-2 hours, adding mannitol, and continuously reacting at 70-80 ℃ for 5-6 hours to obtain a cross-linking agent A;
(B) Preparation of crosslinker B: zirconium dioxide, glycerol, citric acid, tetramethyl propylene diamine and water are mixed, reacted for 30-40min at 25 ℃, then sodium hydroxide is added, after 2-3h of reaction at 50-60 ℃, mannitol is added, and the reaction is continued for 5h at 70-80 ℃ to obtain a cross-linking agent B;
(C) Preparation of high-temperature cross-linking agent: the cross-linking agent A and the cross-linking agent B are uniformly mixed according to the mass ratio of (0.1-0.25) to 1 and react for 2-4 hours at 50-60 ℃ to obtain the high-temperature cross-linking agent.
4. A high temperature welan fracturing fluid according to claim 3, characterized in that: in the step (A), the mass ratio of sodium tetraborate, glycerol, sodium hydroxide, sodium gluconate, water and mannitol is 5:3:0.5:10:5: (5-10); in the step (B), the mass ratio of zirconium dioxide, glycerol, citric acid, tetramethyl propylene diamine, water, sodium hydroxide and mannitol is (0.5-1) to 2:2 (1-2) to (5-6): (2-5): (10-15).
5. The high temperature welan fracturing fluid according to claim 1 or 2, characterized in that: the bactericide is dodecyl dimethyl benzyl ammonium chloride aqueous solution.
6. The high temperature welan fracturing fluid of claim 5, wherein: the mass concentration of the dodecyl dimethyl benzyl ammonium chloride aqueous solution is 5-8%.
7. The high temperature welan fracturing fluid according to claim 1 or 2, characterized in that: the demulsification and drainage assisting agent is water, fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether and isopropanol according to the mass ratio of (85-92): (0.05-0.1): (3-5): (5-7) a mixture.
8. The method for preparing the high-temperature welan fracturing fluid according to claim 1 or 2, which is characterized in that: the clay stabilizer is organic clay stabilizer COP-1 produced by Chuanqing drilling.
9. The method for preparing the high Wen Wenlun gum fracturing fluid according to claim 1, which is characterized in that: the method comprises the following steps:
(1) And (3) preparing a base solution: adding modified Wen Lunjiao into water under stirring, stirring for 15-20min, sequentially adding bactericide, demulsification and drainage aid and clay stabilizer, stirring for 2-3 hr to obtain fracturing fluid base solution, and standing at 30deg.C for 3 hr;
(2) Preparation of fracturing fluid: and adding the high-temperature cross-linking agent into the base solution after standing, and stirring for 1-3min to form the high Wen Wenlun glue fracturing fluid.
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