CN115491186A - Injection increasing agent for low-permeability strong water-sensitive stratum and application thereof - Google Patents
Injection increasing agent for low-permeability strong water-sensitive stratum and application thereof Download PDFInfo
- Publication number
- CN115491186A CN115491186A CN202110674995.XA CN202110674995A CN115491186A CN 115491186 A CN115491186 A CN 115491186A CN 202110674995 A CN202110674995 A CN 202110674995A CN 115491186 A CN115491186 A CN 115491186A
- Authority
- CN
- China
- Prior art keywords
- swelling
- agent
- water
- injection
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 123
- 238000002347 injection Methods 0.000 title claims abstract description 109
- 239000007924 injection Substances 0.000 title claims abstract description 109
- 230000001965 increasing effect Effects 0.000 title claims abstract description 35
- 230000002579 anti-swelling effect Effects 0.000 claims abstract description 156
- 239000002253 acid Substances 0.000 claims abstract description 105
- 239000004927 clay Substances 0.000 claims abstract description 80
- 239000007788 liquid Substances 0.000 claims abstract description 37
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 31
- 230000007797 corrosion Effects 0.000 claims abstract description 27
- 238000005260 corrosion Methods 0.000 claims abstract description 27
- 239000003112 inhibitor Substances 0.000 claims abstract description 16
- 150000001768 cations Chemical class 0.000 claims abstract description 15
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 15
- 239000002738 chelating agent Substances 0.000 claims abstract description 12
- 230000002265 prevention Effects 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 9
- 125000001153 fluoro group Chemical class F* 0.000 claims abstract 3
- -1 imidazoline quaternary ammonium salt Chemical class 0.000 claims description 10
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 claims description 8
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 8
- 230000002708 enhancing effect Effects 0.000 claims description 8
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 8
- 159000000000 sodium salts Chemical class 0.000 claims description 8
- 229920002125 Sokalan® Polymers 0.000 claims description 7
- 239000004584 polyacrylic acid Substances 0.000 claims description 6
- DZCAZXAJPZCSCU-UHFFFAOYSA-K sodium nitrilotriacetate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CC([O-])=O DZCAZXAJPZCSCU-UHFFFAOYSA-K 0.000 claims description 6
- 230000008961 swelling Effects 0.000 claims description 6
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 5
- QIVBCDIJIAJPQS-VIFPVBQESA-N L-tryptophane Chemical compound C1=CC=C2C(C[C@H](N)C(O)=O)=CNC2=C1 QIVBCDIJIAJPQS-VIFPVBQESA-N 0.000 claims description 4
- QIVBCDIJIAJPQS-UHFFFAOYSA-N Tryptophan Natural products C1=CC=C2C(CC(N)C(O)=O)=CNC2=C1 QIVBCDIJIAJPQS-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000020477 pH reduction Effects 0.000 abstract description 27
- 238000011161 development Methods 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 41
- 230000000694 effects Effects 0.000 description 39
- 150000001875 compounds Chemical class 0.000 description 22
- 239000000243 solution Substances 0.000 description 22
- 238000010276 construction Methods 0.000 description 19
- 238000005755 formation reaction Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 19
- 230000008901 benefit Effects 0.000 description 16
- 238000001556 precipitation Methods 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 238000004090 dissolution Methods 0.000 description 11
- 230000002411 adverse Effects 0.000 description 10
- 239000000440 bentonite Substances 0.000 description 8
- 229910000278 bentonite Inorganic materials 0.000 description 8
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 8
- 230000005764 inhibitory process Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 7
- 230000009471 action Effects 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
- 239000003381 stabilizer Substances 0.000 description 7
- 238000005303 weighing Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 6
- 150000002221 fluorine Chemical class 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910021645 metal ion Inorganic materials 0.000 description 6
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 150000007519 polyprotic acids Polymers 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000009991 scouring Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009920 chelation Effects 0.000 description 3
- 239000002734 clay mineral Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241000565675 Oncomelania Species 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000002120 nanofilm Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 150000002892 organic cations Chemical class 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000010517 secondary reaction Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- DCCWEYXHEXDZQW-BYPYZUCNSA-N (2s)-2-[bis(carboxymethyl)amino]butanedioic acid Chemical compound OC(=O)C[C@@H](C(O)=O)N(CC(O)=O)CC(O)=O DCCWEYXHEXDZQW-BYPYZUCNSA-N 0.000 description 1
- AOJJSUZBOXZQNB-VTZDEGQISA-N 4'-epidoxorubicin Chemical compound O([C@H]1C[C@@](O)(CC=2C(O)=C3C(=O)C=4C=CC=C(C=4C(=O)C3=C(O)C=21)OC)C(=O)CO)[C@H]1C[C@H](N)[C@@H](O)[C@H](C)O1 AOJJSUZBOXZQNB-VTZDEGQISA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides an injection increasing agent for a low-permeability strong water-sensitive stratum, belonging to the technical field of oil-gas field development, wherein the injection increasing agent comprises an acid liquid system and an anti-swelling system; the acid liquor system comprises the following components in percentage by mass: polybasic organic polymeric acid: 4-8%, hydrochloric acid: 5-10%, fluorine salt: 8-15%, corrosion inhibitor: 0.2-0.5%, clay anti-swelling agent: 0.5-0.9%, chelating agent: 0.5 to 1.0 percent of water, and the balance of water; the anti-swelling system comprises the following components in percentage by mass: organic small cation anti-swelling agent: 10-15%, inorganic salt anti-swelling agent: 8 to 12 percent of water, and the balance of water. The injection increasing agent can effectively remove clay from a near well, improve the formation permeability, and effectively prevent expansion of a far well, so that acidification and expansion prevention are effectively combined, and the dual purposes of integration of prevention and decomposition are realized. The invention also provides application of the injection increasing agent for the low-permeability strong water-sensitive stratum in injection increasing of the low-permeability strong water-sensitive stratum.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to an injection increasing agent for a low-permeability strong water-sensitive stratum and application thereof.
Background
And in order to supplement stratum energy as oil and gas exploitation enters the middle and later stages, the injection and production structure is changed on the basis of the original injection and production well group, the injection and production well pattern is further perfected, and the transfer injection is carried out on some low-yield wells or new drilled wells. In the process of transferring injection, because the clay content of the stratum is higher (more than 10%), and the water-sensitive minerals such as montmorillonite and illite contained in the stratum are more, the phenomena of hydration expansion and migration appear after the injected water with low mineralization enters the stratum and contacts with the clay minerals, so that the pores and the throat of the stratum are reduced, the permeability of the stratum is reduced, the pressure of a water injection well is increased, the phenomena of insufficient injection and non-injection are common, the energy of the stratum can not be supplemented, and the oil reservoir development effect is seriously influenced.
The problem is solved by adopting (1) anti-expansion water injection or continuous anti-expansion, adding an anti-expansion agent into the injected water to inhibit the expansion of clay minerals so as to slow down the rising speed of water injection pressure, and economically considering that the using concentration of the anti-expansion agent cannot be too high, and in addition, the anti-expansion agent has certain damage to the stratum, and the phenomena of under-injection and non-injection of a water injection well cannot be avoided in the long term. (2) And (4) acidizing and removing the blockage, namely injecting a certain amount of acidizing fluid into the water injection well to remove the damage caused by the blockage of the near well, wherein the effective period is short. The method is very urgent for the stable injection and augmented injection treatment of the low-permeability strong water-sensitive stratum transfer well.
CN102775980B discloses a acidizing blocking remover suitable for complex lithology. The method is prepared by adopting main acid, organic acid and additive according to a certain proportion, is suitable for plugging removal of water injection wells with larger difference of lithology and physical property of oil fields, and does not relate to a specific treatment method of low-permeability strong water-sensitive stratum.
CN104612650A discloses an oxidative complex acid deep acidizing plug removal method for acidizing plug removal of a water injection well. The method comprises the steps of sequentially injecting active water, acidic blockage removing liquid and main component acid liquid into a water injection well to be blocked, and then injecting the oxidized blockage removing agent liquid and the acidic blockage removing liquid into the water injection well to be blocked simultaneously by using two cement trucks to remove the blockage. The method is suitable for plugging a common water injection well, and a specific treatment method for a low-permeability strong water-sensitive stratum is not involved.
CN108517204A discloses a three-in-one acidification blocking remover for oil well blocking removal and an application method thereof. The blocking remover is prepared from polybasic organic acid, a precipitation inhibitor, an iron ion chelating agent, an anti-swelling agent, an acid sludge resistant agent, a corrosion inhibitor, hydrogen fluoride, a demulsifier and a waterproof locking agent. The method is suitable for inorganic scale and organic scale blockage of general oil wells, and a specific treatment method for low-permeability and strong water-sensitive formations is not involved.
CN104629712B discloses a deep acidizing acid liquid and a method for realizing deep acidizing of low-permeability sandstone reservoir, which is composed of hydrochloric acid, hydrofluoric acid, formic acid, acetic acid, a stabilizer, a corrosion inhibitor, an auxiliary discharging agent, an iron ion stabilizer, a thickening agent and a surfactant. The method is suitable for deep acidizing reconstruction of the low-permeability sandstone reservoir, the action distance of acid liquor in the stratum is prolonged mainly through the reaction time of the bedrock, and a specific treatment method of the low-permeability strong water-sensitive stratum is not involved.
Disclosure of Invention
In order to solve the problem of injection enhancement of a low-permeability strong water-sensitive stratum, the invention provides an injection enhancement agent for the low-permeability strong water-sensitive stratum, which can effectively remove clay from a near well, improve stratum permeability, effectively prevent expansion from a far well, effectively combine acidification and expansion prevention and realize the dual purposes of integration of prevention and solution.
The invention also provides application of the injection increasing agent for the low-permeability strong water-sensitive stratum in injection increasing of the low-permeability strong water-sensitive stratum.
The invention is realized by the following technical scheme:
the application provides an injection increasing agent for a low-permeability strong water-sensitive stratum, which comprises an acid liquor system and an anti-swelling system;
the acid liquor system comprises the following components in percentage by mass:
polybasic organic polymeric acid: 4-8%, hydrochloric acid: 5-10%, fluorine salt: 8-15%, corrosion inhibitor: 0.2-0.5%, clay anti-swelling agent: 0.5-0.9%, chelating agent: 0.5 to 1.0 percent of water, and the balance of water;
the anti-swelling system comprises the following components in percentage by mass:
organic small cation anti-swelling agent: 10-15%, inorganic salt anti-swelling agent: 8 to 12 percent of water, and the balance of water.
Optionally, the polybasic organic polymeric acid comprises polyacrylic acid and/or a polymeric polycarboxylic acid.
Optionally, the fluoride salt comprises ammonium fluoride and/or ammonium bifluoride.
Optionally, the corrosion inhibitor includes at least one of 2-mercaptobenzothiazole, cycloalkylimidazoline, and imidazoline quaternary ammonium salt.
Optionally, the clay anti-swelling agent includes HJZ-400 (a clay stabilizer model manufactured by Oncomelania Biotechnology Co., ltd.) and/or HJZ-100 (a clay stabilizer model manufactured by Oncomelania Biotechnology Co., ltd.).
Optionally, the chelating agent comprises sodium nitrilotriacetate and/or sodium salt of tryptophan diacetate.
Optionally, the organic small cation anti-swelling agent comprises H gamma-201 (anti-swelling agent model manufactured by Bin Huiyuan Petroleum technology, inc.) and/or HJZ-100.
Optionally, the inorganic salt anti-swelling agent comprises an inorganic potassium salt and/or an inorganic sodium salt.
Optionally, the mass concentration of the hydrochloric acid is 29-33%.
Optionally, the mass ratio of the acid liquid system to the anti-swelling system is (30-60) to (3-5).
Based on the same inventive concept, the application also provides application of the injection increasing agent for the hypotonic strong water-sensitive stratum in injection increasing of the hypotonic strong water-sensitive stratum.
Optionally, the application includes:
injecting the acid liquor system into the stratum, and then injecting the acid liquor system into the middle slug;
and injecting an anti-swelling system after the middle slug is injected.
Optionally, the total volume of the acid liquid system is 30-60 m 3 The total volume of the anti-swelling system is 3-5 m 3 。
Optionally, the total volume of the middle slug is 2-3 m 3 。
Optionally, the middle slug comprises water and an anti-swelling agent, and the mass fraction of the anti-swelling agent is 0.3-0.5%.
Optionally, the anti-swelling agent comprises HJZ-100 or HJZ-400.
Optionally, the formation is a hypotonic strong water sensitive formation.
One or more technical schemes in the invention at least have the following technical effects or advantages:
1. the invention relates to an injection increasing agent for a low-permeability strong water-sensitive stratum, which adopts a multielement organic polymeric acid-acid liquid system and a compound anti-swelling system to perform combined action, adopts the multielement organic polymeric acid-acid liquid system to inject into the stratum, can quickly remove clay in a near well zone of the stratum on the basis of avoiding secondary precipitation, improves the stratum structure, can inject a high-concentration compound anti-swelling system slug, continuously dilutes the high-concentration anti-swelling system in the subsequent water injection process to enter the deep part of the stratum to play an anti-swelling role on the clay in the deep part of the stratum, has slow flow rate when the injected water enters a far well zone, avoids the flushing of the injected water to the near well zone existing in the independent anti-swelling process, influences the anti-swelling effect, and achieves the effect of the anti-swelling of a near well for deblocking the far well.
2. The invention relates to an application of an injection increasing agent in the injection increasing of a low-permeability strong water-sensitive stratum, which comprises the steps of firstly injecting an acid liquor system into the stratum, quickly removing clay in a near wellbore zone of the stratum on the basis of avoiding secondary precipitation, improving the stratum structure, then injecting an intermediate slug, aiming at isolating the acid liquor system from a subsequently injected compound anti-expansion system, and finally injecting an anti-expansion system slug, wherein the high-concentration anti-expansion agent is continuously diluted in the subsequent water injection process and enters the deep part of the stratum to play an anti-expansion role on the clay in the deep part of the stratum, and the flow rate is slow when the injected water enters a far wellbore zone, so that the flushing of the near wellbore zone by the injected water existing in the independent anti-expansion process is avoided, the anti-expansion effect is influenced, the effect of the anti-expansion of the near well for deblocking the far well is achieved, the low-permeability strong water-sensitive stratum is treated, the permeability of the near wellbore zone is improved, and the anti-expansion effect of the far wellbore zone is enhanced.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of the application of an injection enhancement agent of the present invention in the injection enhancement of a hypotonic strong water-sensitive formation;
FIG. 2 is a water injection displacement pressure and displacement speed curve diagram of embodiment 1 of the invention;
FIG. 3 is a graph of the effect of acidizing radius on the production index ratio of an oil and gas well.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In order to solve the technical problems, the general idea is as follows:
according to an exemplary embodiment of the present invention, an injection enhancement agent for a hypotonic strong water-sensitive formation is provided, the injection enhancement agent comprising an acid system and an anti-swelling system;
the acid liquor system comprises the following components in percentage by mass:
polybasic organic polymeric acid: 4-8%, hydrochloric acid: 5-10%, fluorine salt: 8-15%, corrosion inhibitor: 0.2-0.5%, clay anti-swelling agent: 0.5-0.9%, chelating agent: 0.5 to 1.0 percent of water, and the balance of water;
the anti-swelling system comprises the following components in percentage by mass:
organic small cation anti-swelling agent: 10-15%, inorganic salt anti-swelling agent: 8 to 12 percent of water, and the balance of water.
The invention adopts a multielement organic polymeric acid-liquid system and a compound anti-swelling system to perform combined action, adopts the multielement organic polymeric acid-liquid system to inject into the stratum, can quickly remove clay in the near wellbore region of the stratum on the basis of avoiding secondary precipitation, improves the stratum structure, can inject a high-concentration compound anti-swelling system slug afterwards, continuously dilutes the high-concentration anti-swelling system to enter the deep part of the stratum in the subsequent water injection process, plays an anti-swelling role on the clay in the deep part of the stratum, has slow flow rate when the injected water enters the far wellbore region, avoids the scouring of the injected water to the near wellbore region existing in independent anti-swelling, influences the anti-swelling effect, and achieves the effects of unblocking and anti-swelling of the near wellbore.
The polybasic organic polymeric acid system has the advantages of strong dissolution loss of clay and less secondary precipitation, is different from the polybasic organic polymeric acid, the polybasic organic polymeric acid mainly plays a role in dissolving and losing stratum bedrock, an adsorption film can be formed on the surface of the clay after being injected into a stratum, and the reaction of the clay and the polybasic organic polymeric acid is inhibited, the polybasic organic polymeric acid mainly dissolves and loses the clay, and the capacity of inhibiting secondary precipitation is stronger than that of the polybasic organic polymeric acid, because the ionized H is generated during the reaction of the polybasic organic polymeric acid + More than the polyhydroic acid, ensures that the solution keeps a lower pH value in the reaction process, avoids the secondary reaction of the acid solution and the clay to generate the precipitates of silicate, caF and the like, and simultaneously adds the chelating agent to Ca 2+ 、Mg 2+ 、Fe 2+ 、Na + 、K + The metal ions have strong chelation, and NH is ionized from villaumite 4 + For Na + 、K + 、SiF 6 2- Has dispersing effect, and further avoids secondary precipitation.
The composite anti-swelling system has the characteristics that a stable molecular chain with a certain length, a large number of electropositive groups in molecules, a longer molecular film formed by the composite anti-swelling system and the like are adsorbed to a plurality of crystal layers and particles, and the longer adsorption chain enables the scouring resistance of the composite anti-swelling system to be stronger than that of a conventional anti-swelling agent.
In an acid liquor system:
the mass fraction of the polybasic organic polymer acid is 4-8%, within the concentration range, the dissolution loss of the formation clay with different clay contents is optimized, the increase of the concentration can cause cost increase and over acidification of the formation to form collapse, below the concentration range, the dissolution loss of the clay is small, the field requirement cannot be met, above the concentration range, the adverse effect is cost increase, and over acidification of the formation can also cause collapse.
The hydrochloric acid has the function of dissolving inorganic scale firstly after entering a stratum, so that waste of polybasic organic polymeric acid is avoided, the stratum is kept at a lower pH value, the advantage of 5-10% of mass fraction is that the inorganic scale is optimally treated in the concentration range, the adverse effect below the range is that the inorganic scale is incompletely treated in the stratum, so that the waste of the polybasic organic polymeric acid is caused, the dissolution and loss effects of the polybasic organic polymeric acid on clay are influenced, and the adverse effect above the range is that the inorganic scale in the stratum is not enough to react with acid liquor, so that the consumption is too large, so that the corrosion of a tubular column is increased while the acid liquor is wasted.
The advantage that the mass fraction of the fluorine salt is 8-15% is that the hydrofluoric acid generated by combining the fluorine salt with the polybasic organic polymeric acid in the concentration range can sufficiently react with the clay near the well zone, the adverse effect brought by the range below the range is that the hydrofluoric acid generated by combining the fluorine salt with the polybasic organic polymeric acid is insufficient, the treatment on the clay of the stratum is insufficient, the later effect is influenced, and the construction cost is increased and the medicament waste is caused when the range above the range is higher.
The corrosion inhibitor has the function of inhibiting corrosion of acid liquor on the pipe column, the advantage that the corrosion inhibitor has low corrosion inhibition capability on the pipe column in the concentration range is that the corrosion inhibitor meets the standard requirement of the acidification industry, the adverse effect brought below the range is that the corrosion inhibition capability of the acid liquor on the pipe column is not enough, the corrosion of the acid liquor on the pipe column is caused, the quality of the pipe column is influenced, the adverse effect brought above the range is that the corrosion inhibition effect on the pipe column is not greatly increased while the construction cost is improved.
The clay anti-swelling agent has the functions of protecting the formation clay and avoiding water-sensitive swelling and migration, and the mass fraction of the clay anti-swelling agent is 0.5-0.9 percent, so that the clay anti-swelling capacity is higher (more than 90 percent) in the concentration range, the adverse effect below the range is insufficient protection of the formation clay, the anti-swelling rate is lower, the construction effect is influenced, and the adverse effect above the range is not large in expansion-preventing rate increase of the clay while the construction cost is improved.
The mass fraction of the chelating agent is 0.5-1.0%, the chelating ability of an acid liquor system to metal ions can be met, the generation of precipitates is avoided, the chelating ability to the metal ions is low due to the adverse effect below the range, the acidification requirement is not met, the precipitates can be formed, and the chelating ability to the metal ions is not greatly increased when the adverse effect above the range is that the construction cost is increased.
In the anti-swelling system:
the organic small cation anti-swelling agent is adsorbed on the surface of clay particles to protect the clay and avoid water sensitivity, the mass fraction of 10-15% has the advantages that the anti-swelling agent is compounded with the inorganic salt anti-swelling agent in the concentration range, and the synergistic effect of the anti-swelling agent can be achieved only after the anti-swelling agent is continuously diluted by injected water, the anti-swelling rate is greater than the single use effect, the synergistic effect with the inorganic salt anti-swelling agent can not be achieved below the range, the compounding effect is lost, and the construction cost can be improved and the best effect can not be achieved when the anti-swelling agent is higher than the range.
As an alternative embodiment, the poly-organic polymeric acid comprises polyacrylic acid and/or polymeric polycarboxylic acid.
In the present application, the polybasic organic polymeric acids include polyacrylic acids and/or polymeric polybasic carboxylic acids capable of slowly ionizing more than 10H's in the formation + With F in solution - And the pH value of the solution is kept low, so that secondary precipitation caused by the reaction is avoided.
As an alternative embodiment, the fluoride salt comprises ammonium fluoride and/or ammonium bifluoride.
In the application, the fluorine salt adopts ammonium fluoride and/or ammonium bifluoride, and ionized fluorine ions and H ionized by polybasic organic polymeric acid + Combine to form HF, react with the formation, and ionize the resulting NH 4 + For Na + 、K + 、SiF 6 2- Has dispersing effect, and can furtherThe secondary precipitation is avoided.
As an alternative embodiment, the corrosion inhibitor includes at least one of 2-mercaptobenzothiazole, cycloalkylimidazoline, and imidazoline quaternary ammonium salt.
As an alternative embodiment, the clay antiswelling agent comprises HJZ-400 and/or HJZ-100.
In the application, the clay anti-swelling agent adopts HJZ-400 and/or HJZ-100, and has the advantages that the clay has a stabilizing effect on the formation clay by adding lower concentration, and the anti-swelling rate reaches more than 90%.
As an alternative embodiment, the chelating agent comprises sodium nitrilotriacetate and/or sodium salt of tryptophan diacetate.
In the application, the chelating agent adopts sodium nitrilotriacetate and/or sodium tryptophan diacetate, and can treat Ca 2+ 、Mg 2 + 、Fe 2+ 、Na + 、K + The metal ions have stronger chelation, and the generation of secondary precipitation is avoided or reduced.
As an alternative embodiment, the organic small cation anti-swelling agent comprises HY-201 and/or HJZ-100.
In the application, the organic small cation anti-swelling agent adopts HY-201 and/or HJZ-100, and has the advantages that the lower concentration can stabilize the stratum clay, the anti-swelling rate reaches more than 90%, and the principle of the organic small cation anti-swelling agent is that the organic small cation anti-swelling agent can be strongly adsorbed on exchange points of the clay in a network form through a plurality of cation groups on a molecular chain, and is firmly adsorbed on the surface of the clay through acting forces such as intermolecular force, hydrogen bond force and the like, so that the hydration expansion and the dispersion migration of clay minerals are ensured, the use concentration of the product is low, the scouring resistance is strong, and the performance is stable.
As an alternative embodiment, the inorganic salt antiswelling agent comprises an inorganic potassium salt and/or an inorganic sodium salt.
In this application, inorganic salt anti-swelling agent adopts inorganic potassium salt and/or inorganic sodium salt, and the benefit of bringing is the low price, can prevent swelling agent complex with organic, through the synergism, promotes the anti-swelling effect of anti-swelling system to clay.
In an alternative embodiment, the hydrochloric acid has a mass concentration of 29 to 33%.
In the present application, industrial hydrochloric acid may be used as the hydrochloric acid, and the concentration thereof is usually 29 to 33%.
As an alternative embodiment, the mass ratio of the acid liquid system to the anti-swelling system is (30-60):
(3～5)。
in the application, the mass ratio of the acid liquid system to the anti-swelling system is (30-60): (3-5), which is calculated according to the thickness, the porosity and the treatment radius of the actual stratum, and different mass ratios are selected according to the thickness, the porosity and the treatment radius of the specific stratum, thereby achieving the effect of effectively integrating acidification and anti-expansion. According to another exemplary embodiment of the present invention, there is provided a use of an injection enhancement agent for a hypotonic strong water sensitive formation for enhancing injection of a hypotonic strong water sensitive formation.
As an alternative embodiment, as shown in fig. 1, the application includes:
s1, injecting an acid liquor system into a stratum, and then injecting an intermediate slug;
and S2, injecting the intermediate slug into an anti-expansion system after the injection is finished.
According to the invention, firstly, an acid liquor system is injected into the stratum, so that clay in a near wellbore zone of the stratum can be rapidly removed on the basis of avoiding secondary precipitation, the stratum structure is improved, then an intermediate slug is injected, the purpose is to isolate the acid liquor system from a subsequently injected compound anti-swelling system, and finally the anti-swelling system slug is injected, in the subsequent water injection process, a high-concentration anti-swelling agent is continuously diluted and enters the deep part of the stratum, so that the anti-swelling effect on the clay in the deep part of the stratum is achieved, when the injected water enters a far wellbore zone, the flow rate is slow, so that the injected water existing in the independent anti-swelling process is prevented from scouring the near wellbore zone, the anti-swelling effect is influenced, the near well unblocking and far wellbore anti-swelling effect is achieved, the low-permeability strong water-sensitive stratum is treated, the permeability of the near wellbore zone is improved, and the anti-swelling effect of the far wellbore zone is enhanced.
As an alternative embodiment, the total volume of the acid system is 30-60 m 3 The total volume of the anti-swelling system is 3-5 m 3 。
In the application, the dosage of the acid liquor system and the anti-swelling system adopts the volume, the acidification radius is generally selected to be 1.0-1.5 m according to the relation between the index change curve of the liquid extraction before and after acidification and the acidification radius, the improvement of the permeability of the near well and the influence caused by the blockage of the near well zone are completely met, and the general design dosage is based on the thickness of the stratum
Calculated by the degree and the porosity, the thickness is about 30 to 60m 3 The concentration of a subsequent anti-expansion system is higher, about 18-27%, the design radius is about 0.2m generally, the design radius is increased by 36-54 times by considering the continuous dilution of subsequent water injection according to the calculation of the concentration of 0.5%, and the requirement of anti-expansion in a far well zone can be met sufficiently.
As an optional embodiment, the total volume of the middle section plug is 2-3 m 3 。
In the application, the advantage that the volume is adopted to the middle slug quantity is that enough separate the acid liquor system and the follow-up compound anti-expansion system in the stratum, the quantity is large and has no bad place, but the field construction time is long, resulting in higher construction cost.
As an optional embodiment, the middle slug comprises water and an anti-swelling agent, and the mass fraction of the anti-swelling agent is 0.3-0.5%.
In this application, the advantage that water and anti-swelling agent adopted above-mentioned mass ratio is in this quantity range, and is better to the anti-swelling effect of clay, reaches more than 90%, and use cost also can not be too high.
As an alternative embodiment, the anti-swelling agent comprises: HJZ-100 or HJZ-400.
In the application, the anti-swelling agent adopting the components has the advantages that the anti-swelling agent has a stabilizing effect on the formation clay by adding lower concentration, and the anti-swelling rate reaches more than 85 percent.
As an alternative embodiment, the formation is a hypotonic strong water sensitive formation.
The injection enhancing agent for hypotonic strong water-sensitive formation and the application thereof will be described in detail below with reference to examples and experimental data.
Example 1
The embodiment of the injection enhancement agent for the low-permeability strong water-sensitive stratum comprises the following steps:
(1) At room temperature, 163.4g of tap water is taken from a glass beaker, 1.0g of HJZ-100 anti-swelling agent, 1.0g of sodium nitrilotriacetate, 0.6g of imidazoline quaternary ammonium salt, 16g of ammonium bifluoride, 10g of hydrochloric acid and 8g of polyacrylic acid are sequentially added, and the mixture is uniformly stirred by a stirrer to prepare an acid liquid system;
(2) 164g of tap water is taken in a glass beaker, 20g of organic small cation HJZ-100 anti-swelling agent and 16g of inorganic salt anti-swelling agent potassium salt are sequentially stirred by a stirrer to be uniformly mixed, and an anti-swelling system is prepared.
And (4) related tests: under the temperature condition of 60 ℃,2 natural cores (the clay content is 12.8 wt%) with the size of 2.5cm multiplied by 10cm are used, one of the natural cores is subjected to displacement by adopting a special displacement experiment device for acidification, the flow rate is 0.5mL/min, firstly, an acid liquid system with the volume of 0.3PV (pore volume) is injected, after the injection, clear water with the weight of 0.05PV and an anti-swelling agent (0.5 wt%) is injected to serve as an isolation slug, and finally, a 0.1PV anti-swelling system is injected. And finally, performing water flooding on the 2 natural cores respectively at different injection speeds, and observing the change of injection pressure of water injection after independent water injection and injection agent treatment (namely, prevention and control integrated measures) are performed, wherein the result is shown in figure 2.
As shown in fig. 2, the core start pressure without treatment was higher, and the displacement pressure increased linearly as the displacement speed increased; the rock core subjected to the integrated anti-cracking treatment is low in starting pressure, the displacement pressure trend is gentle along with the increase of the displacement speed, and the rising speed is low and far lower than that of the rock core which is not treated.
Through detection, the acid solution system of the embodiment has a clay dissolution rate of 42.8%, a corrosion inhibition rate of 90.37% for the P110 steel sheet and an anti-swelling rate of 88.5%. When the compound anti-swelling system is diluted to 0.5%, the anti-swelling rate of the clay is 89.6%.
Example 2
The embodiment of the injection enhancement agent for the low-permeability strong water-sensitive stratum comprises the following steps:
(1) At room temperature, 129.2g of tap water is taken from a glass beaker, 1.8g of HJZ-400 anti-swelling agent, 2.0g of nitrilotriacetic acid, 1.0g of 2-mercaptobenzothiazole, 30g of ammonium bifluoride, 20g of hydrochloric acid and 16g of polymeric polycarboxylic acid are sequentially added, and an acid liquid system is prepared by uniformly stirring the materials by a stirrer;
(2) 146g of tap water is taken from a glass beaker, 30g of organic small cation HJZ-100 anti-swelling agent and 24g of inorganic salt anti-swelling agent potassium salt are sequentially stirred by a stirrer to be uniformly prepared into a compound anti-swelling system.
Through detection, the acid solution system solution of the embodiment has 54.8% of clay dissolution rate, 93.52% of corrosion inhibition rate and 91.6% of expansion prevention rate on the P110 steel sheet. When the compound anti-swelling system is diluted to 0.5%, the anti-swelling rate of the clay is 93.7%.
Example 3
The embodiment of the injection enhancement agent for the low-permeability strong water-sensitive stratum comprises the following steps:
(1) At room temperature, 139.4g of tap water is taken from a glass beaker, 1.6g of HJZ-400 anti-swelling agent, 2.0g of sodium salt of aspartic acid diacetate, 1.0g of cycloalkyl imidazoline, 24g of ammonium fluoride, 1 abalone hydrochloride and 16g of poly-polycarboxylic acid are sequentially added, and the mixture is uniformly stirred by a stirrer to prepare an acid liquid system;
(2) 156g of tap water is taken from a glass beaker, 24g of organic small cation HY-201 anti-swelling agent and 20g of inorganic salt anti-swelling agent potassium salt are sequentially stirred by a stirrer to be uniformly prepared into a compound anti-swelling system.
Through detection, the acid solution system of the embodiment has 49.5% of clay dissolution rate, 92.85% of corrosion inhibition rate and 90.12% of expansion prevention rate on the P110 steel sheet. When the compound anti-swelling system is diluted to 0.5%, the anti-swelling rate of the clay is 91.75%.
In examples 1-3, the relevant detection methods were as follows:
the clay dissolution rate of the acid liquor system is obtained by measuring the dissolution failure effect of the first-grade bentonite after the acid liquor system is added under the stratum condition, and the test is carried out according to the standard of Q/SY 5358-2010 reservoir sensitivity flow experiment evaluation method, and the specific test method comprises the following steps: drying primary bentonite to constant weight at 80 ℃ for later use; (2) Weighing two parts of bentonite on an electronic balance according to the solid-liquid ratio of 1.5g rock sample/10 mL acid liquid, wherein the volume of the acid liquid is not more than 30mL, placing the bentonite in a 50mL plastic centrifuge tube, and weighing the mass of the filter paper and the empty weighing bottle at the same time; (3) Adding acid liquor into the centrifuge tubes respectively, and covering to prevent the reaction liquid from volatilizing; (4) Putting the centrifugal tube into a thermostatic water bath for 1h, and then putting the centrifugal tube into a centrifuge to centrifuge for 5-10min at the speed of 3000 r/min; (5) Washing the separated filter residue with NaOH solution with the concentration of 0.1% to be nearly neutral, and washing the filter residue with distilled water to be neutral; (6) And filtering the reactant by using weighed filter paper, putting the filter residue and the filter paper together in a weighed weighing bottle, drying at 80 ℃ to constant weight, and calculating the mass of the filter residue. Erosion rate = (mass of clay before reaction-mass of residue after reaction)/mass of clay before reaction × 100%.
The corrosion inhibition rate of the acid liquor system on the pipe column steel is to measure the corrosion effect of the added acid liquor system on the P110 steel sheet under the stratum condition. The method is tested according to SY-T5405-1996 test method and evaluation index for the performance of the corrosion inhibitor for acidification, and the specific test method comprises the following steps: (1) Taking a steel sheet, measuring the size of the steel sheet by using a vernier caliper, tying a plastic wire in a hole on the steel sheet, taking the knotting number of the plastic wire as the serial number of the same group of test pieces, and recording the geometric size and the mass of the test pieces; (2) Pouring 20mL of acid liquor per square centimeter of surface area into a reaction container, then placing the reaction container into a water bath tank, and turning on a heating power supply to raise the temperature of the acid liquor in the reaction container to a specified temperature; (3) The steel sheet is hung singly, three sheets are combined, and the steel sheet is respectively put into two parts of parallel acid solution without or with corrosion inhibitor, all the surfaces of the test piece are ensured to be contacted with the acid solution, and the reaction time is recorded. (4) After the reaction reaches the preset time, stopping heating and taking out the steel sheet, observing the corrosion condition and recording in detail; (5) After observation, the test piece is washed by water, brushed by a soft brush, cut off plastic wires, simultaneously, the serial number is recorded on clean filter paper, finally, the test piece is washed piece by acetone and absolute ethyl alcohol, and the test piece is placed on the filter paper with the serial number. (6) Drying with cold air, drying in a drying oven for 20min, and weighing to 0.0001g. Corrosion inhibition rate = (mass of steel sheet before reaction-mass of steel sheet after reaction)/mass of steel sheet before reaction x 100%.
The anti-swelling rate of the clay is that under the stratum condition, the anti-swelling effect of the liquid added with the anti-swelling agent on the first-class bentonite is measured. Is evaluated according to SY-T5971-94 property evaluation of clay stabilizer for water injectionPrice method standard. The specific test method comprises the following steps: (1) Weighing 0.50g of bentonite powder (or rock sample), accurately weighing to 0.01g, placing into a 10mL centrifuge tube, adding 10mL of clay stabilizer solution, shaking thoroughly, storing at room temperature for 2h, placing into a centrifuge, centrifuging at 1500r/min for 15min, reading out the volume V of the swelled bentonite (rock sample) 1 . (2) The swelling volume V of the bentonite in water is then determined separately by replacing the clay stabilizer solution with 10mL of distilled water or kerosene, respectively 2 And expansion volume V in kerosene 0 . Anti-swelling rate = (V) 2 -V 1 )/(V 2 -V 0 )×100％。
Example 4
In the acidification process, the acidification radius plays a main role, the acidification radius is designed for effectively removing blockage, the aim of seeking the overlarge acidification radius is to ensure that the acidification injection multiplication ratio is not obviously increased, a relation graph of the liquid extraction index ratio and the acidification radius is drawn through analyzing the liquid extraction indexes before and after acidification, and the result is shown in figure 3.
In the above formula: j is a unit of a The index of the acidized fluid recovery is; j. the design is a square d The index of the liquid collection before acidification; x d The ratio of the permeability after injury to the permeability before injury; r is a Is the radius of acidification; r is a radical of hydrogen e Is the boundary radius; r is a radical of hydrogen w Is the wellbore radius.
From fig. 3 and the above formula, it can be seen that: as the acidizing radius increases, the oil well productivity gradually increases; the more serious the damage degree is, the larger the capacity recovery amplitude is; for a new transfer well, stratum damage is not serious, when the acidizing radius exceeds about 1.0m, the acidizing radius is continuously increased, the acidizing yield increase amplitude is slowed down, and therefore, the acidizing treatment radius of a low-permeability oil reservoir with high clay content is generally set to be 1.0-1.5 m.
In the embodiment, a Nei 1-69-50 well in a Neman oil area of a Liaohe oil field is taken as an example, the well belongs to a new transfer injection well, and in order to avoid the problems of too fast pressure rise and insufficient injection in the water injection process, an integrated injection increasing construction measure is directly adopted. The average clay content of the well is 17.8% through the data of the small layer, and the formula of an organic polymeric acid liquid system used in the construction is as follows through indoor research and analysis: (6% polyacrylic acid, 8% hydrochloric acid, 12% ammonium bifluoride, 0.5% imidazoline quaternary ammonium salt, 0.6% clay anti-swelling agent HJZ-400, 0.5% nitrilotriacetic acid sodium salt, and the balance of water); the formula of the anti-swelling system is as follows: (10% of small organic cation anti-swelling agent HJZ-100, 8% of inorganic salt anti-swelling agent sylvite and the balance of water).
The well implements a solution and prevention integrated injection increasing technical measure in 2019, 1 month and 20 days, and according to an index ratio change curve of the acidification radius to the oil and gas well liquid production index, the on-site acidification radius is 1.0m, and the dosage of an organic polymeric acid liquid system is 30m 3 The dosage of the compound anti-swelling system is 5.0m 3 。
The construction steps are as follows: firstly injecting an acid liquor system, then injecting clear water and an anti-swelling agent slug of 2.0m 3 The anti-swelling agent adopts HJZ-100 with the concentration of 0.4wt%, and is preferably injected into a compound anti-swelling system to replace clean water by 15m 3 。
And (3) construction results: in the process of acidizing construction, the construction pressure is reduced from 16.6MPa to 12.0MPa, and then clear water and an anti-swelling agent slug are injected for 2.0m 3 Injecting a compound anti-expansion system, keeping the pressure at 12.0MPa, and after the measures are finished, injecting water, wherein the initial injection pressure is 8.1MPa, and the injection amount is 20m 3 Daily water injection of 23m 3 Has obvious effect, and can be injected into the injection tube for 20m after the injection is stabilized 3 The pressure is 8.5MPa, and the stable injection is kept until 12 months and 31 days in 2020.
Example 5
In the embodiment, the Naegen 1-70-56 wells in the Naegen oil area of Liaohe oil field are taken as examples, the wells belong to old wells for layer supplement betting, continuous water injection and expansion prevention are carried out at the initial stage, and the injection allocation amount is 25m 3 Daily injection of 17.2m 3 The pressure is 13.4MPa; as the injection progresses, the pressure rises too fast to 16.5MPa, and the daily dose drops to 9.68m 3 And water filling time 130d. The water added with the anti-swelling agent is continuously injected into the stratum to ensure that the stratum clay is not subjected to water sensitivity, the mass fraction of the anti-swelling agent is controlled to be 0.2 percent in consideration of the cost problem, and the method has certain anti-swelling effect on the stratum at the initial stageThe effect is that because the using concentration is too low, the near-wellbore region anti-swelling agent is washed by water at high speed along with the water injection process, the anti-swelling agent adsorbed on the clay falls off, and meanwhile, the concentration of the anti-swelling agent in the solution is not high enough to be adsorbed on the surfaces of all the clays, so that the clay is expanded.
Indoor research and analysis shows that the water injection pressure is high and the water injection is insufficient due to the fact that the well is injected with water after continuous anti-swelling measures, the clay in the near wellbore zone is considered to be expanded and transported, the acid solution concentration and the radius need to be increased for plugging removal at this time, the clay in the near wellbore zone is removed to the maximum extent, in addition, the average clay content of the well is 26.5% through the data of a small layer, and the organic polymeric acid solution system used in the construction is as follows: (8% polyacrylic acid, 10% hydrochloric acid, 15% ammonium bifluoride, 0.5% imidazoline quaternary ammonium salt, 0.9% clay anti-swelling agent HJZ-400, 1.0% nitrilotriacetic acid, and the balance of water); the formula of the anti-swelling system is as follows: (15% of small organic cation anti-swelling agent HJZ-100, 12% of inorganic salt anti-swelling agent potassium salt and the balance of water).
The well implements a technical measure of preventing and releasing integrated injection increasing in 2019, 12 months and 02 days, and according to a curve of the change of the acidification radius to the oil and gas well liquid production index ratio, the on-site acidification radius is 1.5m, and the dosage of an organic polymeric acid liquid system is 45m 3 The dosage of the compound anti-swelling system is 5m 3 。
The construction steps are as follows: firstly, organic polymeric acid is injected, and then clear water and anti-swelling agent slug are injected for 2.0m 3 The anti-swelling agent adopts HJZ-100 with the concentration of 0.5wt%, and then is injected into a compound anti-swelling system to replace clean water by 15m 3 。
And (3) construction results: in the process of acidification construction, the construction pressure is reduced from 19.0MPa to 14.0MPa, and then clear water slug of 2.0m is injected 3 Injecting a compound anti-expansion system, increasing the pressure to 14.5MPa, and after the measures are finished, injecting water, wherein the initial injection pressure is 13.5MPa, and the injection amount is 20m 3 Daily water injection of 19.83m 3 Has obvious effect, and can be injected into the injection of 19.5m after the injection is stabilized 3 The pressure is 14.1MPa, and the stable injection is kept until 12 months and 31 days in 2020.
One or more technical solutions in the present application at least have the following technical effects or advantages:
(1) The invention relates to an injection increasing agent for a low-permeability strong water-sensitive stratum, which adopts a multielement organic polymeric acid liquid system and a compound anti-swelling system to perform combined action, adopts the multielement organic polymeric acid liquid system to inject into the stratum, can quickly remove clay in a near well zone of the stratum on the basis of avoiding secondary precipitation, improves the stratum structure, can inject a high-concentration compound anti-swelling system slug, continuously dilutes the high-concentration anti-swelling system to enter the deep part of the stratum in the subsequent water injection process to play an anti-swelling role on the clay in the deep part of the stratum, has slow flow rate when the injected water enters a far well zone, avoids the flushing of the injected water to the near well zone existing in the independent anti-swelling process to influence the anti-swelling effect and achieve the effect of unblocking the far well and preventing swelling of the near well.
(2) The invention relates to an injection increasing agent for a hypotonic strong water-sensitive stratum, a polybasic organic polymeric acid liquid system has the advantages of strong clay dissolution loss and less secondary precipitation, the acid liquid is different from polybasic acid, the polybasic acid mainly plays a role in dissolution loss of stratum bedrock, an adsorption film can be formed on the surface of clay after being injected into the stratum, and the reaction of the clay and the polybasic acid is inhibited, the polybasic organic polymeric acid mainly dissolves and loses the clay, and the capability of inhibiting secondary precipitation is stronger than that of the polybasic acid, because the H ionized from the polybasic organic polymeric acid during the reaction + More than the polyhydroic acid, ensures that the solution keeps a lower pH value in the reaction process, avoids the acid liquor and the clay from generating secondary reaction to generate precipitates such as silicate, caF and the like, and simultaneously, the added chelating agent is used for Ca 2+ 、Mg 2 + 、Fe 2+ 、Na + 、K + The metal ions have strong chelation, and NH is ionized from villaumite 4 + For Na + 、K + 、SiF 6 2- Has dispersing effect, and further avoids secondary precipitation.
(3) The utility model provides an injection agent for hypotonic strong water-sensitive stratum, compound anti-swelling system has the stable molecular chain of certain length, contain a large amount of electropositive groups in the molecule and form longer molecular film and adsorb characteristics such as a plurality of crystal layers and particle, because its longer adsorption chain for its resistance to washing is stronger than conventional anti-swelling agent, this solve and prevent integrative injection technique system is applicable to hypotonic strong water-sensitive new transfer well, the work progress is simple, the quantity is less, it is obvious to steadily annotate the injection effect, it has important effect to the high-efficient development of oil field.
(4) The application of the injection enhancing agent in the injection enhancement of the low-permeability strong-water-sensitive stratum comprises the steps of firstly injecting an acid liquor system into the stratum, quickly removing clay in a near wellbore zone of the stratum on the basis of avoiding secondary precipitation, improving the stratum structure, then injecting an intermediate slug, aiming at isolating the acid liquor system from a subsequently injected compound anti-expansion system, and finally injecting an anti-expansion system slug.
Finally, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (17)
1. An injection increasing agent for a low-permeability strong water-sensitive stratum, which is characterized by comprising an acid liquid system and an anti-swelling system;
the acid liquor system comprises the following components in percentage by mass:
polybasic organic polymeric acid: 4-8%, hydrochloric acid: 5-10%, fluorine salt: 8-15%, corrosion inhibitor: 0.2-0.5%, clay anti-swelling agent: 0.5-0.9%, chelating agent: 0.5 to 1.0 percent of water, and the balance of water;
the anti-swelling system comprises the following components in percentage by mass:
organic small cation anti-swelling agent: 10-15%, inorganic salt anti-swelling agent: 8 to 12 percent of water, and the balance of water.
2. The injection enhancing agent for a hypotonic strong water-sensitive formation according to claim 1, wherein the poly organic polymeric acid comprises polyacrylic acid and/or polymeric polycarboxylic acid.
3. The injection enhancing agent for the low-permeability strong water-sensitive formation and the application thereof according to claim 1, wherein the fluorine salt comprises ammonium fluoride and/or ammonium bifluoride.
4. The injection enhancing agent for a low permeability, strong water sensitive formation of claim 1 wherein the corrosion inhibitor comprises at least one of 2-mercaptobenzothiazole, cycloalkylimidazoline, and imidazoline quaternary ammonium salt.
5. The injection enhancement agent for a hypotonic strong water-sensitive formation according to claim 1, wherein the clay swelling prevention agent comprises HJZ-400 and/or HJZ-100.
6. The injection enhancing agent for a hypotonic strong water-sensitive formation according to claim 1, wherein the chelating agent comprises sodium nitrilotriacetate and/or sodium salt of tryptophan diacetate.
7. The injection enhancement agent for the low-permeability strong water-sensitive formation according to claim 1, wherein the organic small cation expansion prevention agent comprises HY-201 and/or HJZ-100.
8. The injection enhancement agent for a hypotonic strong water-sensitive formation according to claim 1, wherein the inorganic salt swelling inhibitor comprises an inorganic potassium salt and/or an inorganic sodium salt.
9. The injection enhancement agent for the hypotonic strong water-sensitive stratum according to claim 1, wherein the mass concentration of the hydrochloric acid is 29-33%.
10. The injection enhancement agent for the low-permeability strong water-sensitive formation as claimed in claim 1, wherein the mass ratio of the acid liquid system to the anti-swelling system is (30-60) to (3-5).
11. Use of the injection enhancement agent of any one of claims 1-10 for enhancing injection into a hypotonic, strongly water-sensitive formation.
12. The application according to claim 11, wherein the application comprises:
injecting the acid liquor system into the stratum, and then injecting the acid liquor system into the middle slug;
and after the injection of the middle slug is finished, injecting an anti-swelling system.
13. Use according to claim 12, wherein the total volume of the acid system is between 30 and 60m 3 The total volume of the anti-swelling system is 3-5 m 3 。
14. According to the claimsThe use according to claim 12, wherein the total volume of the intermediate slug is 2 to 3m 3 。
15. The use according to claim 12, characterized in that the composition of the intermediate slug comprises water and an anti-swelling agent, the mass fraction of which is between 0.3 and 0.5%.
16. The use of claim 12 wherein the anti-swelling agent comprises HJZ-100 or HJZ-400.
17. The use according to claim 12, wherein the formation is a hypotonic strong water-sensitive formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110674995.XA CN115491186A (en) | 2021-06-17 | 2021-06-17 | Injection increasing agent for low-permeability strong water-sensitive stratum and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110674995.XA CN115491186A (en) | 2021-06-17 | 2021-06-17 | Injection increasing agent for low-permeability strong water-sensitive stratum and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115491186A true CN115491186A (en) | 2022-12-20 |
Family
ID=84464787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110674995.XA Pending CN115491186A (en) | 2021-06-17 | 2021-06-17 | Injection increasing agent for low-permeability strong water-sensitive stratum and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115491186A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105482802A (en) * | 2015-12-21 | 2016-04-13 | 中国石油天然气股份有限公司 | On-line injection acidification acid fluid system for water injection well and preparation method of on-line injection acidification acid fluid system |
| CN105838341A (en) * | 2016-05-04 | 2016-08-10 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | Long-acting anti-swelling agent for fracturing and preparing method and application thereof |
| CN107325804A (en) * | 2017-07-13 | 2017-11-07 | 陕西省石油化工研究设计院 | A kind of pressure break antiswelling stabilizing agent |
| CN108467724A (en) * | 2018-03-12 | 2018-08-31 | 中国石油天然气股份有限公司 | A kind of online shunting acid and preparation method thereof that water injection well is continuously injected into |
| CN108517204A (en) * | 2018-04-11 | 2018-09-11 | 扬州润达油田化学剂有限公司 | A kind of three-in-one acidification blocking remover and its application process for de-plugging of well |
| CN112251214A (en) * | 2020-10-29 | 2021-01-22 | 四川中汇安达石油化工有限公司 | Stratum degradation acid and application thereof |
| CN112724949A (en) * | 2019-10-14 | 2021-04-30 | 中国石油天然气股份有限公司 | Lactic acidlike blocking remover for blocking removal of thick oil well and application thereof |
-
2021
- 2021-06-17 CN CN202110674995.XA patent/CN115491186A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105482802A (en) * | 2015-12-21 | 2016-04-13 | 中国石油天然气股份有限公司 | On-line injection acidification acid fluid system for water injection well and preparation method of on-line injection acidification acid fluid system |
| CN105838341A (en) * | 2016-05-04 | 2016-08-10 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | Long-acting anti-swelling agent for fracturing and preparing method and application thereof |
| CN107325804A (en) * | 2017-07-13 | 2017-11-07 | 陕西省石油化工研究设计院 | A kind of pressure break antiswelling stabilizing agent |
| CN108467724A (en) * | 2018-03-12 | 2018-08-31 | 中国石油天然气股份有限公司 | A kind of online shunting acid and preparation method thereof that water injection well is continuously injected into |
| CN108517204A (en) * | 2018-04-11 | 2018-09-11 | 扬州润达油田化学剂有限公司 | A kind of three-in-one acidification blocking remover and its application process for de-plugging of well |
| CN112724949A (en) * | 2019-10-14 | 2021-04-30 | 中国石油天然气股份有限公司 | Lactic acidlike blocking remover for blocking removal of thick oil well and application thereof |
| CN112251214A (en) * | 2020-10-29 | 2021-01-22 | 四川中汇安达石油化工有限公司 | Stratum degradation acid and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘柏良等: "段六拨低渗透油田酸压增注技术研究与应用", 《特种油气藏》, pages 67 - 69 * |
| 董法昌: "《海洋油气田采油工艺技术》", 31 March 2003, 石油大学出版社第1版, pages: 160 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4610795A (en) | Peroxygen breaker systems for well completion fluids | |
| US10087362B2 (en) | Treatment fluids comprising viscosifying agents and methods of using the same | |
| US20110220360A1 (en) | Application of alkaline fluids for post-flush or post-treatment of a stimulated sandstone matrix | |
| CN103436247B (en) | A kind of retarded acid acidizing fluid | |
| BRPI0409385B1 (en) | Aqueous fluid for oil field treatment, method of treating an underground sandstone formation, method of removing drilling mud from an oil well, and method of cleaning a seal | |
| CN110452680A (en) | The method for removing blockage of acidification blocking remover and its preparation method and application acidification blocking remover | |
| CN103074050A (en) | Anti-scaling multi-hydrogen retarded acid for highly argillaceous sandstone reservoir | |
| CN108865093B (en) | Infiltration-increasing blockage removing fluid for uranium mine and using method and application thereof | |
| EA018475B1 (en) | Organic corrosion inhibitor package for organic acids | |
| CN103333673A (en) | Deep low-damage acidizing fluid | |
| CN104612650A (en) | Oxidizing composite acid deep acidizing plugging removal method used for acidizing plugging removal of water injection well | |
| CN105368440A (en) | Novel environmental-friendly acidizing fluid suitable for acid-sensitive reservoir stratums, and preparation method thereof | |
| CN108559480A (en) | A kind of Reservoir Acidization augmented injection construction chelating agent and its preparation method and application | |
| CN111574981B (en) | Blocking remover for oil field and preparation method thereof | |
| CN112724949B (en) | Lactic acidlike blocking remover for blocking removal of thick oil well and application thereof | |
| CN108559481A (en) | A kind of low leak-off acidification oil well blockages relieving fluid and preparation method thereof | |
| US10961441B2 (en) | Acidizing solution for dissolution of clay mineral and preparation method thereof | |
| Templeton et al. | Self-generating mud acid | |
| CN103013489A (en) | Acidation blocking remover and preparation method thereof | |
| CN106507863B (en) | In in-situ leaching uranium, augmented injection method is taken out in the increasing of wellhole | |
| CN113249100A (en) | Nitrogen foam water control and plugging agent and use method thereof | |
| CN115491186A (en) | Injection increasing agent for low-permeability strong water-sensitive stratum and application thereof | |
| CN113292974B (en) | Chlorine dioxide polymer oxidation blocking remover | |
| CN115991988A (en) | Acidizing fracturing fluid for petroleum exploitation and preparation method and application thereof | |
| CN110982503B (en) | Dissolved polymer microsphere composite unblocking acid and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |