CN110872508B - Non-crosslinked fracturing fluid and preparation method and application thereof - Google Patents
Non-crosslinked fracturing fluid and preparation method and application thereof Download PDFInfo
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- CN110872508B CN110872508B CN201811488241.XA CN201811488241A CN110872508B CN 110872508 B CN110872508 B CN 110872508B CN 201811488241 A CN201811488241 A CN 201811488241A CN 110872508 B CN110872508 B CN 110872508B
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- 239000012530 fluid Substances 0.000 title claims abstract description 188
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002562 thickening agent Substances 0.000 claims abstract description 37
- 239000011973 solid acid Substances 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 31
- 238000005260 corrosion Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003112 inhibitor Substances 0.000 claims abstract description 27
- VYGSFTVYZHNGBU-UHFFFAOYSA-N trichloromethanesulfonic acid Chemical compound OS(=O)(=O)C(Cl)(Cl)Cl VYGSFTVYZHNGBU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004927 clay Substances 0.000 claims abstract description 14
- 239000003381 stabilizer Substances 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims description 50
- 239000000203 mixture Substances 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 33
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 31
- 229920002866 paraformaldehyde Polymers 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 26
- 239000013543 active substance Substances 0.000 claims description 25
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 25
- 239000004576 sand Substances 0.000 claims description 23
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 17
- 241000779819 Syncarpia glomulifera Species 0.000 claims description 16
- 239000001739 pinus spp. Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 16
- 229940036248 turpentine Drugs 0.000 claims description 16
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims description 14
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- 235000010493 xanthan gum Nutrition 0.000 claims description 13
- 229940082509 xanthan gum Drugs 0.000 claims description 13
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 11
- YFSUTJLHUFNCNZ-UHFFFAOYSA-N perfluorooctane-1-sulfonic acid Chemical group OS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YFSUTJLHUFNCNZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 230000000844 anti-bacterial effect Effects 0.000 claims description 6
- 239000003899 bactericide agent Substances 0.000 claims description 6
- 125000002091 cationic group Chemical group 0.000 claims description 5
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 239000003945 anionic surfactant Substances 0.000 claims description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- 239000003093 cationic surfactant Substances 0.000 claims description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 3
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 3
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000002736 nonionic surfactant Substances 0.000 claims description 3
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 claims description 3
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- NLYWAVWCHOCYRL-UHFFFAOYSA-N 1-chloro-2,2,2-trifluoroethanesulfonic acid Chemical compound OS(=O)(=O)C(Cl)C(F)(F)F NLYWAVWCHOCYRL-UHFFFAOYSA-N 0.000 claims 2
- 230000003115 biocidal effect Effects 0.000 claims 1
- 239000003139 biocide Substances 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000843 powder Substances 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 description 21
- 208000010392 Bone Fractures Diseases 0.000 description 16
- 238000003756 stirring Methods 0.000 description 14
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 12
- 238000010276 construction Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 239000011435 rock Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229920002907 Guar gum Polymers 0.000 description 5
- 239000003814 drug Substances 0.000 description 5
- 239000000665 guar gum Substances 0.000 description 5
- 235000010417 guar gum Nutrition 0.000 description 5
- 229960002154 guar gum Drugs 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 150000004676 glycans Chemical class 0.000 description 4
- 229920001282 polysaccharide Polymers 0.000 description 4
- 239000005017 polysaccharide Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- -1 trichloromethanesulfonyl Chemical group 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
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- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 208000013201 Stress fracture Diseases 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- WQZGKKKJIJFFOK-SVZMEOIVSA-N (+)-Galactose Chemical compound OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@H]1O WQZGKKKJIJFFOK-SVZMEOIVSA-N 0.000 description 1
- WQZGKKKJIJFFOK-QTVWNMPRSA-N D-mannopyranose Chemical compound OC[C@H]1OC(O)[C@@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-QTVWNMPRSA-N 0.000 description 1
- 125000003436 D-mannopyranosyl group Chemical group [H]OC([H])([H])[C@@]1([H])OC([H])(*)[C@@]([H])(O[H])[C@@]([H])(O[H])[C@]1([H])O[H] 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910002567 K2S2O8 Inorganic materials 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 229940107816 ammonium iodide Drugs 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical group 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- CEEPSRBIVIQHSF-UHFFFAOYSA-N butyl trichloromethanesulfonate Chemical compound CCCCOS(=O)(=O)C(Cl)(Cl)Cl CEEPSRBIVIQHSF-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 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
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229960003082 galactose Drugs 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 125000000311 mannosyl group Chemical group C1([C@@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000005007 perfluorooctyl group Chemical group FC(C(C(C(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)* 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
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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
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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
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Organic Chemistry (AREA)
- Geology (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a non-crosslinked fracturing fluid and a preparation method and application thereof, wherein the non-crosslinked fracturing fluid comprises the following components by taking the total mass of the non-crosslinked fracturing fluid as a reference: 3-30% by mass of a solid acid; 0.02-8% by mass of a non-crosslinked fracturing fluid thickener; 0.0002-0.1 percent of cleanup additive by mass; 0.01-0.1 mass% of a clay stabilizer; 0.001-0.1 mass% of corrosion inhibitor; the balance of solvent; wherein the solid acid is trichloromethane sulfonate. The solid acid is added into the fracturing fluid, on one hand, the solid acid is a powder preparation, is conventional in packaging and storage, has extremely high stability and good safety, does not need a special transportation tank car or a special warehouse, and is comparable to industrial hydrochloric acid in performance and use; on the other hand, the solid acid is added into the fracturing fluid, so that the problems that the solid acid is not completely dissolved when the solid acid prepared by water is metered or has high concentration, a pipeline is easily blocked in site operation, and the injection friction is high are solved.
Description
Technical Field
The invention belongs to the field of petroleum engineering and chemical engineering, relates to a fracturing fluid for reservoir modification of an oil and gas field, and particularly relates to a non-crosslinked fracturing fluid as well as a preparation method and application thereof.
Background
Unconventional natural gas is produced or extracted using techniques other than conventional oil well methods. As regular oil reserves become more scarce, the extraction of unconventional natural gas becomes more and more important.
Carbonate reservoirs are one of the most abundant hydrocarbon resources in the world, with currently about 50% of the hydrocarbon reserves and production from such reservoirs. However, carbonate reservoirs are usually buried deeply, have compact lithology and strong heterogeneity, have the characteristics of low porosity and low permeability, and can be developed and utilized only by reservoir modification.
In addition, unconventional natural gas is also found in reservoirs such as tight sand, shale gas, shale oil, coal bed gas, tight carbonate and natural gas hydrate reservoirs. Typically, these reservoirs are largely impermeable to water and are very dense.
At present, the production increase of oil and gas wells is mainly realized by acid fracturing modification of the unconventional reservoirs, and a means of combining acid fracturing and sand fracturing is adopted in a part of blocks by combining the characteristics of the oil and gas reservoirs. The conventional acid fracturing modification mainly realizes the deep penetration of the manufactured long crack by controlling the filtration loss of acid liquor and delaying the reaction speed of acid rock, but the rock on the wall surface of the crack can be softened and creep after the carbonate rock reservoir is contacted with the acid liquor, so that the flow conductivity of the acid-etched crack is reduced. Meanwhile, the natural micro-fracture system of the carbonate reservoir develops well, the acid liquor filtration is serious in the acid fracturing modification process, a long fracture system is difficult to form, and the acid fracturing modification effect is not ideal. The sand fracturing can form a longer artificial fracture in the carbonate reservoir transformation, and meanwhile, the propping agent in the fracture can effectively support the wall surface of the fracture, so that the fracture is prevented from being closed, and the fracture is promoted to form higher flow conductivity. However, the rock modulus of a carbonate reservoir is generally high, the fracture pressure is high, the construction difficulty is high in the sand adding stage, and meanwhile, construction liquid does not react with the carbonate and is difficult to communicate with a micro-fracture system in the reservoir, so that the gas supply volume after sand adding fracturing modification is limited, and continuous high and stable production is difficult. In order to compound acid fracturing and sand fracturing technologies, a cross-linked acid sand-carrying acid fracturing process appears at home and abroad, namely, a cross-linked acid system is adopted for carrying sand acid fracturing, but the cross-linked acid is usually ground cross-linked, the friction resistance of acid liquid gel after cross-linking is far greater than that of fracturing liquid gel, so that the construction pressure is higher, and meanwhile, the cross-linked acid is a macromolecular polymer, so that the gel breaking difficulty after cross-linking is high, and the damage to a reservoir stratum is serious.
Chinese patent CN103089228 discloses a argillaceous dolomite ground cross-linked acid sand-carrying acid fracturing method, which mainly aims at reducing the flow conductivity of fractures after argillaceous dolomite acid fracturing and adopts cross-linked acid sand-carrying to fill the fractures, but in the method, an acid liquid system is ground cross-linked acid, the wellbore friction resistance is large, the construction pressure is high, and meanwhile, the cross-linked acid system is difficult to realize high sand ratio construction (average sand ratio is 11.2%), so that the sand laying concentration is too low, and the flow conductivity of acid-etched fractures is insufficient.
Chinese patent CN105257272A discloses a high-conductivity acid fracturing method for a carbonate rock reservoir, belonging to the technical field of reservoir transformation. The method combines and applies an acid fracturing process for acid liquor corrosion fracture and a water fracturing process for filling fracture by adding sand, firstly, non-reactive front liquid is adopted to make fracture in a carbonate reservoir, and the temperature around the wall surface of the fracture is reduced; then injecting a high-concentration acid system to erode the wall surface of the artificial crack, eroding the wall surface of the crack to form a non-uniform groove, and providing a certain flow conductivity after the crack is closed; and finally, carrying a propping agent by using a high-viscosity sand carrying fluid to enter a fracture system to fill the fracture, so that the flow conductivity of the fracture is further increased. Although the method can form a high-conductivity fracture system combining acid-etched fractures and supporting fractures, the used acid is liquid hydrochloric acid, and the industrial liquid hydrochloric acid belongs to dangerous chemicals and is difficult to ensure safety in storage, transportation and environmental protection; in addition, in order to increase the viscosity of the acid solution, a cross-linking agent is added into the acid solution.
Crosslinking, although increasing the viscosity of the system, entails the following negative effects: the fracturing fluid preparation process is complex, has high requirement on water quality, long swelling time of the medicament, low fluid preparation efficiency, various types of the prepared fluid medicament and complicated processes of metering and adding the medicament; the gel breaking of the crosslinked polymer is incomplete, and water-insoluble crosslinked fragments are another important factor causing damage to the flow conductivity of cracks; the chemical cross-linked gel is not shear-resistant, so the fracturing fluid is not suitable for large fracturing requiring a system to resist long-time shearing or small pipe columns, continuous oil pipes and jet fracturing with high shearing rate; after a system is crosslinked, the friction resistance of the fracturing fluid can be greatly increased, the energy provided by a ground fracturing pump is inevitably consumed when the friction resistance of the fracturing fluid is increased, in the fracturing of a deep well and a continuous oil pipe, because the friction resistance is too large, the pressure consumed in a pipe column is too large, the energy applied to a stratum is insufficient, the utilization rate of fracturing energy is reduced, the capability of creating cracks is weakened, and even the stratum cannot be pressed open, although the traditional fracturing fluid also adopts the measure of reducing the friction resistance, a method for increasing the fracturing fluid and increasing the hydrostatic pressure in the pipe column to make up the loss of the friction resistance is adopted, the friction resistance of the fracturing fluid is increased, the drainage capability of the fracturing fluid is reduced, and the loss is not compensated; the gel breaking is difficult under the condition of a reservoir at low temperature (less than or equal to 50 ℃), the gel breaking time is long, the residue content after gel breaking is high, the damage to the reservoir is serious, the performance of the cross-linked colloid is unstable under the condition of the reservoir at high temperature (more than or equal to 100 ℃), particularly the sand carrying performance is poor, and the sand removal and sand blocking accidents are easy to happen; in addition, in order to improve the temperature resistance and the biological stability of the guanidine gum fracturing fluid, the crosslinking technology needs to be continuously improved and improved, the component formula is more and more complex, the cost of the working fluid is increased, and the technical instability is increased. These have become bottlenecks in the development of current water-based fracturing fluid technologies.
Therefore, the development of new fracturing fluids and thickening agents thereof with higher and better temperature resistance, salt resistance, shear resistance, low friction resistance and low damage characteristics applicable to tight rock formations is the main trend of the development of the current fracturing fluid technology.
Disclosure of Invention
The invention mainly aims to provide a non-crosslinked fracturing fluid, a preparation method and application thereof, so as to overcome various defects caused by carrying sand by a crosslinked acid in the prior art.
In order to achieve the above object, the present invention provides a non-crosslinked fracturing fluid, which comprises the following components, based on the total mass of the non-crosslinked fracturing fluid:
wherein the solid acid is trichloromethane sulfonate.
The non-crosslinked fracturing fluid disclosed by the invention preferably comprises the following components by taking the total mass of the non-crosslinked fracturing fluid as a reference:
the non-crosslinked fracturing fluid provided by the invention is characterized in that the chemical formula of the trichloromethane sulfonate is CCl3SO3OR, wherein R is preferably a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, OR a hexyl group, and more preferably an n-butyl group.
The non-crosslinked fracturing fluid comprises the following components by taking the total mass of the non-crosslinked fracturing fluid thickening agent as a reference:
the non-crosslinked fracturing fluid of the invention, wherein the non-crosslinked fracturing fluid thickener preferably comprises the following components by taking the total mass of the non-crosslinked fracturing fluid thickener as a reference:
the non-crosslinked fracturing fluid of the invention, wherein the bactericide is preferably paraformaldehyde; the gel breaker is preferably potassium persulfate; the fluorocarbon active agent is preferably FC-95 fluorocarbon active agent.
The non-crosslinked fracturing fluid provided by the invention is characterized in that the cleanup additive is preferably an FC-911 fluorocarbon active agent; the clay stabilizer is preferably a cationic, anionic or nonionic surfactant; the solvent is preferably water.
The non-crosslinked fracturing fluid provided by the invention is characterized in that the corrosion inhibitor is preferably one or more of a group consisting of paraformaldehyde, urotropin and chlorinated turpentine.
The non-crosslinked fracturing fluid is characterized in that the corrosion inhibitor is further preferably a mixture consisting of paraformaldehyde, urotropine and chlorinated turpentine, and the corrosion inhibitor comprises 0.01-3 parts by mass of paraformaldehyde, 10-40 parts by mass of urotropine and 5-70 parts by mass of chlorinated turpentine based on the total mass of the mixture.
In order to achieve the aim, the preparation method of the non-crosslinked fracturing fluid is also provided, and the non-crosslinked fracturing fluid containing the solid acid is obtained by uniformly mixing the solid acid, the non-crosslinked fracturing fluid thickening agent, the cleanup additive, the clay stabilizer and the corrosion inhibitor, then adding the solvent and uniformly stirring.
The preparation method of the non-crosslinked fracturing fluid is preferably as follows:
step 1, mixing a bactericide and a gel breaker;
step 2, mixing xanthan gum and hydroxypropyl guar gum;
and 3, mixing the mixture obtained in the step 1 and the step 2 with a fluorocarbon active agent to obtain the non-crosslinked fracturing fluid thickening agent.
In order to achieve the above purpose, the present invention further provides the application of the non-crosslinked fracturing fluid in a fracturing process, wherein the non-crosslinked fracturing fluid is used as an "acid solution", "pad fluid", "sand carrier fluid" or "displacement fluid" in an acid fracturing process, or is used as a large amount of "slippery water" in a fracturing process.
The invention has the beneficial effects that:
1. the solid acid is added into the fracturing fluid, on one hand, the solid acid is a powder preparation, is conventional in packaging and storage, has extremely high stability and good safety, does not need a special transportation tank car or a special warehouse, and is comparable to industrial hydrochloric acid in performance and use; on the other hand, the solid acid is added into the fracturing fluid, so that the problems that the solid acid is not completely dissolved when the solid acid prepared by water is metered or has high concentration, a pipeline is easily blocked in site operation, and the injection friction is high are solved.
2. The fracturing fluid has the acid etching characteristic of acid fracturing fluid and the water conservancy fracturing characteristic of filling cracks with sand, and can be used for fracturing tight rock stratums such as carbonate reservoirs and sandstone reservoirs.
3. According to the invention, the xanthan gum and the hydroxypropyl guar gum are used cooperatively, so that the viscosity of the fracturing fluid is improved, the cost is reduced, and the gel breaking speed of the fracturing fluid is also enhanced.
Detailed Description
The following examples illustrate the invention in detail: the present example is carried out on the premise of the technical scheme of the present invention, and detailed embodiments and processes are given, but the scope of the present invention is not limited to the following examples, and the experimental methods without specific conditions noted in the following examples are generally performed according to conventional conditions.
The invention provides a non-crosslinked fracturing fluid containing solid acid, which comprises the following components by taking the total mass of the non-crosslinked fracturing fluid as a reference:
wherein the solid acid is trichloromethane sulfonate.
Preferably, the non-crosslinked fracturing fluid comprises the following components (based on the total mass of the non-crosslinked fracturing fluid):
wherein the solid acid comprises Trichloromethane sulfonate (English name: Trichloromethyl sulfonate solid acid), and the chemical formula of the Trichloromethane sulfonate is CCl3SO3OR of CCl3SO3-a functional group, which is often also abbreviated to-OTCl, since it contains trichloromethanesulfonyl. WhereinR is methyl, ethyl, propyl, butyl, pentyl or hexyl, more preferably n-butyl, and specifically, the trichloromethanesulfonate may be n-butyl (CH) trichloromethanesulfonate3CH2CH2CH2OTCl) and trichloromethane sulfonic acid n-butyl ester are strong acid anhydride, and hydrochloric acid automatically released after meeting water can obtain equivalent generated acid concentration. The mass content of the solid acid is 3-30%, preferably 5-24% based on the total mass of the non-crosslinked fracturing fluid.
The cleanup additive is FC-911 fluorocarbon active agent, FC-911 belongs to one of cationic fluorine surfactants, is called perfluoro octyl sulfonic acid quaternary ammonium iodide, and because all hydrogen in octyl is replaced by fluorine atoms, perfluoro octyl is formed, thus endowing the fluorine surfactant with various special properties, and being particularly suitable for serving as Powder cleanup additive (Powder removal for solid acid acidized acid at high temperature reservoir). The content of the cleanup additive is 0.0002% to 0.1%, preferably 0.0005% to 0.07%, and more preferably 0.0005% to 0.008%, by mass, based on the total mass of the non-crosslinked fracturing fluid.
Wherein, the clay stabilizer is cationic, anionic or nonionic surfactant, such as cationic polyacrylamide and polyquaternary ammonium salt; the quaternary ammonium salt surfactant can be a cationic polymer mainly comprising methacryl dimethyl amido ethyl ester and allyl dimethyl ammonium chloride polymer. The clay stabilizer is contained in an amount of 0.01 to 0.1% by mass, preferably 0.01 to 0.08% by mass, and more preferably 0.01 to 0.05% by mass, based on the total mass of the non-crosslinked fracturing fluid.
The corrosion inhibitor is one or more of a group consisting of paraformaldehyde, urotropine and chlorinated turpentine, preferably a mixture consisting of paraformaldehyde, urotropine and chlorinated turpentine, and the corrosion inhibitor comprises 0.01-3 parts by mass of paraformaldehyde, 10-40 parts by mass of urotropine and 5-70 parts by mass of chlorinated turpentine based on the total mass of the mixture. Wherein, Paraformaldehyde (Paraformaldehyde; Polyoxymethylene) is linear polymer of formaldehyde, and the molecular formula is HO- (CH)2O)n-H, n-10-100; black-bone black teaLotropin (English name: hexamethynetramine), molecular formula: c6H12N4(ii) a Chlorinated turpentine (English name: Terpene polychlorinates) with molecular formula of C10H17Cl。
The technical scheme of the invention has low requirement on the quality of the fracturing fluid solvent, and oil layer water, high salinity water, coal bed water, seawater and fracturing fluid construction return water can be used for preparing the fracturing fluid, thereby being beneficial to the reutilization of water resources, and being economic and environment-friendly.
Wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
more preferably comprises the following components:
wherein, Xanthan gum (English: Xanthan gum, transliteration is Xanthan gum) has the chemical molecular formula: c35H49O29The xanthan gum is 0 to 90 parts by mass, preferably 30 to 60 parts by mass, based on the total mass of the fracturing fluid thickener.
Hydroxypropyl guar gum (English name is 'hydroxypropyl guar') has a molecular structure of a nonionic polysaccharide, and polymannan is used as a molecular main chain, and D-mannopyranose units are connected by beta (1-4) glycosidic bonds. And D-galactopyranose is linked to the polymannan backbone by an alpha (1-6) linkage. The molar ratio of mannose to galactose units in guar gum is 2: 1, i.e. every other mannose unit is linked to a galactose branch. The molecular weight of guar gum is reported in the literature to be around 220000. The biggest characteristic of guar molecules, and the greatest advantage, is their close similarity to cellulose structure, which makes them strongly substantive to cellulose, called substantivity. The hydroxypropyl guar gum is 90-0 parts by mass, preferably 60-30 parts by mass, based on the total mass of the fracturing fluid thickener.
According to the application, xanthan gum and hydroxypropyl guar gum are compounded according to a specific proportion, the xanthan gum is polysaccharide, belongs to a non-polar substance, has strong salt resistance and viscosity increasing performance, and is weak in dissolution and dispersion after being added into water. The hydroxypropyl guar gum is prepared by chemically modifying polysaccharide guar gum, increasing the chemical polarity of the modified guar gum and improving the dispersibility of the modified guar gum in water; because the original polysaccharide material characteristic of the xanthan gum can be mutually soluble with the xanthan gum, the water dispersibility of the xanthan gum is improved. Therefore, the matching of the two components not only can exert respective characteristics, but also can play a role in synergistic cooperation, the viscosity of the fracturing fluid is improved, the cost is reduced, and the gel breaking speed of the fracturing fluid is also enhanced.
Wherein the bactericide is Paraformaldehyde (such as Paraformaldehyde, Polyoxymethylene) with molecular formula HO- (CH)2O)n-H, n is 10-100, and the bactericide is 0.001-0.015 parts by mass based on the total mass of the fracturing fluid thickening agent.
Wherein the gel breaker is ammonium persulfate or potassium persulfate and the like; potassium persulfate (English name Potassium persulfate), molecular formula K2S2O8The mass of the gel breaker is 6.985-9.899 parts by mass based on the total mass of the fracturing fluid thickening agent.
Wherein the Fluorocarbon active agent is FC-95 Fluorocarbon active agent (English: fluoronates Surfactant/fluorocarbonate Surfactant), and the Fluorocarbon active agent accounts for 0.1-3.0 parts by mass based on the total mass of the fracturing fluid thickening agent.
The invention also provides a preparation method of the non-crosslinked fracturing fluid containing the solid acid, which comprises the steps of uniformly mixing the solid acid, the non-crosslinked fracturing fluid thickening agent, the cleanup additive, the clay stabilizer and the corrosion inhibitor, then adding the solvent and uniformly stirring to obtain the non-crosslinked fracturing fluid containing the solid acid.
The fracturing fluid densifier is a compounded dry powder medicament, and all components in the dry powder medicament can be compounded when a manufacturer leaves a factory, then solid acid and other auxiliaries are added when the fracturing fluid densifier is used on site, and then the fracturing fluid densifier is mixed with a solvent uniformly for use.
The fracturing fluid thickening agent can also be purchased from different manufacturers, and the thickening agent is compounded on site, wherein the preferable sequence of compounding is as follows:
step 1, mixing a bactericide and a gel breaker;
step 2, mixing xanthan gum and hydroxypropyl guar gum;
and 3, mixing the mixture obtained in the step 1 and the step 2 with a fluorocarbon active agent to obtain the non-crosslinked fracturing fluid thickening agent.
The invention further provides the application of the non-crosslinked fracturing fluid containing the solid acid in a fracturing process, and the non-crosslinked fracturing fluid containing the solid acid can be used as an acid solution, a pre-fracturing fluid, a sand carrying fluid or a displacing fluid in an acid fracturing process or used as a large amount of slippery water in the acid fracturing process.
The technical scheme of the invention is further illustrated by the following specific examples, and the raw materials used in the invention are all commercial products unless otherwise specified.
Example 1
In this embodiment, based on the total mass of the non-crosslinked fracturing fluid, the non-crosslinked fracturing fluid includes the following components:
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
the corrosion inhibitor is a mixture consisting of paraformaldehyde, urotropine and chlorinated turpentine, and the corrosion inhibitor comprises 0.01 part by mass of paraformaldehyde, 30 parts by mass of urotropine and 25 parts by mass of chlorinated turpentine based on the total mass of the mixture.
Mixing reduced gum and hydroxypropyl guar gum according to the formula of the fracturing fluid densifier to obtain a mixture 1, mixing paraformaldehyde and potassium persulfate to obtain a mixture 2, mixing the mixtures 1 and 2 with an FC-95 fluorocarbon active agent, and uniformly stirring to obtain the fracturing fluid densifier.
And then uniformly mixing the trichloromethane sulfonate, the fracturing fluid densifier, the FC-911 fluorocarbon active agent, the clay stabilizer and the corrosion inhibitor according to the formula proportion of the fracturing fluid, adding water, and uniformly stirring again to obtain the non-crosslinked fracturing fluid.
Example 2
In this embodiment, based on the total mass of the non-crosslinked fracturing fluid, the non-crosslinked fracturing fluid includes the following components:
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
the corrosion inhibitor is a mixture consisting of 3 parts by mass of paraformaldehyde, 22 parts by mass of urotropine and 65 parts by mass of chlorinated turpentine, based on the total mass of the mixture.
Mixing reduced gum and hydroxypropyl guar gum according to the formula of the fracturing fluid densifier to obtain a mixture 1, mixing paraformaldehyde and potassium persulfate to obtain a mixture 2, mixing the mixtures 1 and 2 with an FC-95 fluorocarbon active agent, and uniformly stirring to obtain the fracturing fluid densifier.
And then uniformly mixing the trichloromethane sulfonate, the fracturing fluid densifier, the FC-911 fluorocarbon active agent, the clay stabilizer and the corrosion inhibitor according to the formula proportion of the fracturing fluid, adding water, and uniformly stirring again to obtain the non-crosslinked fracturing fluid.
Example 3
In this embodiment, based on the total mass of the non-crosslinked fracturing fluid, the non-crosslinked fracturing fluid includes the following components:
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
the corrosion inhibitor is a mixture consisting of paraformaldehyde, urotropine and chlorinated turpentine, and based on the total mass of the mixture, the mass of the paraformaldehyde in the corrosion inhibitor is 1.5 parts, the mass of the urotropine in the corrosion inhibitor is 10 parts, and the mass of the chlorinated turpentine is 70 parts.
Mixing reduced gum and hydroxypropyl guar gum according to the formula of the fracturing fluid densifier to obtain a mixture 1, mixing paraformaldehyde and potassium persulfate to obtain a mixture 2, mixing the mixtures 1 and 2 with an FC-95 fluorocarbon active agent, and uniformly stirring to obtain the fracturing fluid densifier.
And then uniformly mixing the trichloromethane sulfonate, the fracturing fluid densifier, the FC-911 fluorocarbon active agent, the clay stabilizer and the corrosion inhibitor according to the formula proportion of the fracturing fluid, adding water, and uniformly stirring again to obtain the non-crosslinked fracturing fluid.
Example 4
In this embodiment, based on the total mass of the non-crosslinked fracturing fluid, the non-crosslinked fracturing fluid includes the following components:
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
the corrosion inhibitor is a mixture consisting of 3 parts by mass of paraformaldehyde, 40 parts by mass of urotropine and 5 parts by mass of chlorinated turpentine, based on the total mass of the mixture.
Mixing reduced gum and hydroxypropyl guar gum according to the formula of the fracturing fluid densifier to obtain a mixture 1, mixing paraformaldehyde and potassium persulfate to obtain a mixture 2, mixing the mixtures 1 and 2 with an FC-95 fluorocarbon active agent, and uniformly stirring to obtain the fracturing fluid densifier.
And then uniformly mixing the trichloromethane sulfonate, the fracturing fluid densifier, the FC-911 fluorocarbon active agent, the clay stabilizer and the corrosion inhibitor according to the formula proportion of the fracturing fluid, adding water, and uniformly stirring again to obtain the non-crosslinked fracturing fluid.
Example 5
In this embodiment, based on the total mass of the non-crosslinked fracturing fluid, the non-crosslinked fracturing fluid includes the following components:
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
the corrosion inhibitor is a mixture consisting of paraformaldehyde and urotropine, wherein the mass of the mixture is taken as a reference, the mass of the paraformaldehyde is 3 parts, and the mass of the urotropine is 40 parts.
Mixing reduced gum and hydroxypropyl guar gum according to the formula of the fracturing fluid densifier to obtain a mixture 1, mixing paraformaldehyde and potassium persulfate to obtain a mixture 2, mixing the mixtures 1 and 2 with an FC-95 fluorocarbon active agent, and uniformly stirring to obtain the fracturing fluid densifier.
And then uniformly mixing the trichloromethane sulfonate, the fracturing fluid densifier, the FC-911 fluorocarbon active agent, the clay stabilizer and the corrosion inhibitor according to the formula proportion of the fracturing fluid, adding water, and uniformly stirring again to obtain the non-crosslinked fracturing fluid.
Example 6
In this embodiment, based on the total mass of the non-crosslinked fracturing fluid, the non-crosslinked fracturing fluid includes the following components:
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components (based on the total mass of the non-crosslinked fracturing fluid thickening agent):
wherein the corrosion inhibitor is chlorinated pine knot.
Mixing the reduced gum, the hydroxypropyl guar gum, the paraformaldehyde, the potassium persulfate and the FC-95 fluorocarbon active agent according to the formula of the fracturing fluid thickening agent, and uniformly stirring to obtain the fracturing fluid thickening agent.
And then uniformly mixing the trichloromethane sulfonate, the fracturing fluid densifier, the FC-911 fluorocarbon active agent, the clay stabilizer and the corrosion inhibitor according to the formula proportion of the fracturing fluid, adding water, and uniformly stirring again to obtain the non-crosslinked fracturing fluid.
And (3) performance measurement:
1. reference trade mark for non-crosslinked fracturing fluids obtained in examples 1-6The 6.6 fracturing fluid temperature and shear resistant capacity determination part in the Standard SY/T5107 & 2005 water-based fracturing fluid Performance evaluation method adopts an Anton Paar rheometer to perform determination under the determination condition of 170s-1The fracturing fluids of examples 1 to 6 were measured to have viscosities of more than 60 mPas at 40 ℃ and were subjected to continuous shearing for 90min, so that the viscosity of the fracturing fluid was hardly lowered.
2. With reference to the 6.13 fracturing fluid gel breaking performance determination part in SY/T5107 + 2005 water-based fracturing fluid performance evaluation method in the industry standard, the viscosity and the surface/interface tension of the fracturing fluid gel breaking liquid obtained in examples 1-6 at 40 ℃ are determined by a black viscometer, a TX-500 rotary drop type interface tensiometer and a full-automatic surface tensiometer, and the results are as follows: the gel breaking time is 2-4 hours, the surface tension of the gel breaking liquid is less than or equal to 20mN/m, and the interfacial tension is less than or equal to 1 mN/m; the residue content is less than or equal to 100 mg/l.
3. According to 6.13.1 indoor drag reduction rate test part in SYT 6376-2008 fracturing fluid general technical conditions in the industry standard, a fracturing fluid friction resistance test pipeline is adopted, and the shear rate is 40s at 40 DEG C-1Under the condition, the pressure difference of the fracturing fluid systems of examples 1 to 6 flowing through two ends of a pipeline is tested, the resistance reduction rate of the fracturing fluid systems is calculated, and the average resistance reduction rates of the fracturing fluid systems of examples 1 to 6 are all larger than or equal to 75%.
4. According to the 6.9 static fluid loss measurement part in SY/T5107 + 2005 water-based fracturing fluid performance evaluation method in the industry standard, a high-temperature high-pressure static fluid loss instrument is adopted to measure the accumulated fluid loss of the fracturing fluid system at 40 ℃ and under the condition that the test pressure difference is 3.5MPa and at different times, and the fluid loss rate and the fluid loss coefficient of the system at 40 ℃ are calculated according to the calculation method given in the industry standard. Examples 1-6 fracturing fluid systems having fluid loss coefficients of less than 9.0X 10-4m/min1/2Fluid loss rate of less than 1.5X 10-4m/min。
The invention has the beneficial effects that:
1. the non-crosslinked fracturing fluid containing the solid acid has low friction, high crack forming efficiency and strong sand carrying performance, and the maximum sand carrying concentration is less than or equal to 1000kg/m3The liquid preparation speed can reach 20m3Min, can be simultaneously mixed and continuously constructed with solid acid powder on site, and is suitable for liquid preparation construction with any dosage and scale。
2. The fracturing fluid containing the solid acid has low concentration, avoids the problems that the solid acid is not completely dissolved when the solid acid prepared by water is metered or has high concentration, the pipeline is easy to block in site construction and the injection friction is high, and does not generate acid mist in the construction process.
3. The fracturing fluid disclosed by the invention has the characteristics of acid corrosion and sand carrying and seam making, can effectively carry out acid corrosion on a reservoir with high carbonate rock content to reduce the reservoir fracture pressure, can simultaneously remove inorganic and organic plugs, is suitable for acidification and acid fracturing operation construction at the temperature of 20-180 ℃, and achieves the purposes of increasing yield and increasing injection.
4. The fracturing fluid has the characteristic of slowly releasing acid, increases the depth of an acid-etched reservoir, has better transformation effect, good compatibility with the reservoir and other acid liquor, does not generate secondary precipitation, has low damage to the reservoir, has small corrosion to construction equipment, pipelines and underground pipe columns, and is safe and reliable to use.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The non-crosslinked fracturing fluid is characterized by comprising the following components by taking the total mass of the non-crosslinked fracturing fluid as a reference:
wherein the solid acid is trichloromethane sulfonate; the cleanup additive is FC-911 fluorocarbon active agent; the clay stabilizer is a cationic, anionic or nonionic surfactant; the corrosion inhibitor is one or more of a group consisting of paraformaldehyde, urotropine and chlorinated turpentine;
wherein the non-crosslinked fracturing fluid thickening agent comprises the following components by taking the total mass of the non-crosslinked fracturing fluid thickening agent as a reference:
2. the non-crosslinked fracturing fluid of claim 1, wherein the non-crosslinked fracturing fluid comprises, based on the total mass of the non-crosslinked fracturing fluid:
3. the non-crosslinked fracturing fluid of claim 1 or 2, wherein the chlorotrifluoroethanesulfonate has the chemical formula CCl3SO3OR, wherein R is methyl, ethyl, propyl, butyl, pentyl OR hexyl.
4. The non-crosslinked fracturing fluid of claim 3, wherein the chlorotrifluoroethanesulfonate has the chemical formula CCl3SO3R in OR is n-butyl.
5. The non-crosslinked fracturing fluid of claim 1, wherein the biocide is paraformaldehyde; the gel breaker is potassium persulfate; the fluorocarbon active agent is FC-95 fluorocarbon active agent.
6. The non-crosslinked fracturing fluid of claim 1, wherein the solvent is water.
7. The non-crosslinked fracturing fluid of claim 1, wherein the corrosion inhibitor is a mixture of paraformaldehyde, urotropin and chlorinated turpentine, and based on the total mass of the mixture, the corrosion inhibitor comprises 0.01-3 parts by mass of paraformaldehyde, 10-40 parts by mass of urotropin and 5-70 parts by mass of chlorinated turpentine.
8. The preparation method of the non-crosslinked fracturing fluid of any one of claims 1 to 7, characterized in that the solid acid, the non-crosslinked fracturing fluid thickening agent, the cleanup additive, the clay stabilizer and the corrosion inhibitor are mixed uniformly, and then the solvent is added and stirred uniformly to obtain the non-crosslinked fracturing fluid containing the solid acid.
9. The method for preparing the non-crosslinked fracturing fluid of claim 8, wherein the method for preparing the non-crosslinked fracturing fluid thickener comprises:
step 1, mixing a bactericide and a gel breaker;
step 2, mixing xanthan gum and hydroxypropyl guar gum;
and 3, mixing the mixture obtained in the step 1 and the step 2 with a fluorocarbon active agent to obtain the non-crosslinked fracturing fluid thickening agent.
10. The use of the non-crosslinked fracturing fluid of any one of claims 1 to 7 in a fracturing process, wherein the non-crosslinked fracturing fluid is used as an "acid fluid", "pad fluid", "sand carrier fluid" or "displacement fluid" in an acid fracturing process, or as a large amount of "slick water" in an acid fracturing process.
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| CN103590803A (en) * | 2012-08-13 | 2014-02-19 | 中国石油天然气股份有限公司 | Solid acid fracturing process method |
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