CN112251214A - Stratum degradation acid and application thereof - Google Patents
Stratum degradation acid and application thereof Download PDFInfo
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- CN112251214A CN112251214A CN202011180808.4A CN202011180808A CN112251214A CN 112251214 A CN112251214 A CN 112251214A CN 202011180808 A CN202011180808 A CN 202011180808A CN 112251214 A CN112251214 A CN 112251214A
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- 239000002253 acid Substances 0.000 title claims abstract description 53
- 230000015556 catabolic process Effects 0.000 title claims abstract description 36
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 36
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 69
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003381 stabilizer Substances 0.000 claims abstract description 24
- 239000004094 surface-active agent Substances 0.000 claims abstract description 20
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 19
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 19
- 239000004927 clay Substances 0.000 claims abstract description 15
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 claims abstract description 13
- 239000003112 inhibitor Substances 0.000 claims abstract description 12
- 230000020477 pH reduction Effects 0.000 claims abstract description 12
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 24
- 229960004106 citric acid Drugs 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000004310 lactic acid Substances 0.000 claims description 12
- 235000014655 lactic acid Nutrition 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- FLHWLBNLXDWNJC-UHFFFAOYSA-N 4,5-dihydroimidazole-1-sulfonic acid Chemical compound OS(=O)(=O)N1CCN=C1 FLHWLBNLXDWNJC-UHFFFAOYSA-N 0.000 claims description 9
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 9
- 229920000570 polyether Polymers 0.000 claims description 9
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 9
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 9
- 239000003784 tall oil Substances 0.000 claims description 9
- 239000003129 oil well Substances 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- -1 alcohol ether carboxylate Chemical class 0.000 claims description 7
- 150000001408 amides Chemical class 0.000 claims description 6
- 230000002579 anti-swelling effect Effects 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 229920002553 poly(2-methacrylolyloxyethyltrimethylammonium chloride) polymer Polymers 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 229960004543 anhydrous citric acid Drugs 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 claims description 2
- 125000002636 imidazolinyl group Chemical group 0.000 claims description 2
- 230000005012 migration Effects 0.000 claims description 2
- 238000013508 migration Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 230000008961 swelling Effects 0.000 claims description 2
- 150000001342 alkaline earth metals Chemical class 0.000 claims 1
- 238000011109 contamination Methods 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 abstract description 9
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 abstract description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 235000019253 formic acid Nutrition 0.000 abstract description 3
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 150000007524 organic acids Chemical class 0.000 abstract description 2
- KEQGZUUPPQEDPF-UHFFFAOYSA-N 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione Chemical compound CC1(C)N(Cl)C(=O)N(Cl)C1=O KEQGZUUPPQEDPF-UHFFFAOYSA-N 0.000 abstract 1
- 238000006065 biodegradation reaction Methods 0.000 abstract 1
- XTHPWXDJESJLNJ-UHFFFAOYSA-N chlorosulfonic acid Substances OS(Cl)(=O)=O XTHPWXDJESJLNJ-UHFFFAOYSA-N 0.000 abstract 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 abstract 1
- 231100000989 no adverse effect Toxicity 0.000 abstract 1
- 238000003756 stirring Methods 0.000 description 33
- 238000002360 preparation method Methods 0.000 description 13
- 239000003921 oil Substances 0.000 description 8
- 230000032683 aging Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920002545 silicone oil Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229920000289 Polyquaternium Polymers 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical class [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 150000003863 ammonium salts Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003124 biologic agent Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/725—Compositions containing polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—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
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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
- 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
-
- 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
- C09K2208/32—Anticorrosion additives
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses a safe and environment-friendly stratum degradation acid which is mainly applied to acidification and blockage removal during oil extraction and comprises the following components in percentage by weight: 10% -25% of citric acid; 1% -5% of polyacrylic acid; 5% -20% of dodecyl benzene sulfonic acid; 1% -5% of a surfactant; 1% -3% of high-temperature corrosion inhibitor; 1% -5% of iron stabilizer; 1% -3% of clay stabilizer; 1% -3% of an intelligent agent; the balance being water. The stratum degradation acid disclosed by the invention has the advantages of good acidification effect, long duration, easiness in biodegradation, safety, environmental friendliness and no adverse effect on the stratum, and does not contain inorganic strong acid commonly used in the traditional acidification, such as hydrochloric acid, hydrofluoric acid, nitric acid, organic acid formic acid, acetic acid, sulfamic acid, chlorosulfonic acid and the like.
Description
Technical Field
The invention belongs to the field of petroleum additives, and particularly relates to a formation degradation acid and a preparation method and application thereof.
Background
With the rapid increase of global economy, the dependence of petroleum resources is getting more and more serious, although researchers have systematically researched and gained favorable results in other energy sources, such as solar energy, wind energy, nuclear energy and other fields, at present, 90% of energy required by transportation in the world still needs to be acquired by petroleum, and the downstream industry chain of petroleum still has irreplaceable effect in the whole industry.
Due to the lack of protection consciousness and excessive exploitation of human beings, the reserves of global petroleum resources are less and less, and with the increasing shortage of world energy supply, how to improve the recovery ratio of crude oil and obtain the highest economic benefit on the premise of low cost and stratum protection is an urgent problem faced by the oil field industry at present.
Oil extraction is a very complex process, whether physical oil extraction or chemical oil extraction, or other methods, the solid phase deposition phenomenon faced by oil extraction seriously affects the development of the oil industry, and especially in recent years, heavy oil is extracted in large quantities, and the blockage of a heavy oil well is particularly serious.
At present, acidification is a common technology for oil well blockage removal, a conventional acidification blockage removal agent mainly comprises hydrochloric acid, nitric acid, formic acid, acetic acid and other auxiliary agents, but with the increasing requirement on environmental protection, a large amount of residual acid discharged after conventional acidification blockage removal is difficult to perform post-treatment, acid neutralization treatment needs to be performed on site, and meanwhile, acidification flowback liquid cannot enter a production flow so as to increase the requirement on discharge treatment.
Disclosure of Invention
The invention aims to provide a safe and environment-friendly stratum degradation acid which is mainly used for acidification and blockage removal in oil exploitation, does not contain conventional hydrochloric acid, nitric acid, formic acid and acetic acid, and eliminates a series of problems of residual acid treatment and the like in conventional acidification and blockage removal.
In order to achieve the purpose, the invention discloses the following technical contents:
the safe and environment-friendly stratum degradation acid is characterized by comprising the following raw materials in percentage by weight:
10% -25% of citric acid;
1% -5% of polyacrylic acid;
5% -20% of dodecyl benzene sulfonic acid;
1% -5% of a surfactant;
1% -3% of high-temperature corrosion inhibitor;
1% -5% of iron stabilizer;
1% -3% of clay stabilizer;
1% -3% of an intelligent agent;
the balance of water;
the surfactant refers to alcohol ether carboxylate AEC-9H or gemini surfactant;
wherein the gemini surfactant is degradable amide gemini quaternary ammonium salt;
the high-temperature corrosion inhibitor refers to imidazoline IS-129 or tall oil imidazoline sulfonate;
the iron stabilizer refers to lactic acid;
the clay stabilizer refers to polyacrylamide or polyquaternium-37;
the intelligent agent is amino polyether organic silicon.
The weight percentage of the citric acid is 15-20%; the citric acid is anhydrous citric acid or citric acid with crystal water; the weight percentage of the polyacrylic acid is 1-3%, and the molecular weight is 2000-5000-. The weight percentage of the dodecyl benzene sulfonic acid is 5% -10%; the surfactant is alcohol ether carboxylate AEC-9H or gemini quaternary ammonium salt, and the weight percentage of the surfactant is 1-3%; the high-temperature corrosion inhibitor IS imidazoline IS-129 or tall oil imidazoline sulfonate, and the weight percentage of the high-temperature corrosion inhibitor IS 1-2%; the iron stabilizer is lactic acid, and the weight percentage of the iron stabilizer is 1-3%; the clay stabilizer is polyacrylamide or polyquaternium-37, and the weight percentage of the clay stabilizer is 1-2%; the intelligent agent is amino polyether organic silicon, and the weight percentage of the intelligent agent is 1-2%.
The invention further discloses application of the safe and environment-friendly stratum degradation acid in effectively relieving stratum pollution of an oil well. Wherein, the stratum pollution of the oil well is effectively relieved and comprises iron and ferrous iron scale, carbonic acid alkaline earth metal scale, stratum particle migration blockage and organic blockage.
The invention also discloses application of the safe and environment-friendly stratum degradation acid in the aspects of anti-swelling and sand stabilizing during acidification and blockage removal. The method mainly comprises the following steps: the inorganic scale precipitation is removed, the generation of secondary acidification precipitation is prevented and removed, the clay volume expansion is prevented, and the stratum blockage is reduced.
The invention is described in more detail below:
the invention relates to a safe and environment-friendly stratum degradation acid which is a multifunctional compound composition, and the main components of the safe and environment-friendly stratum degradation acid comprise the following components: 10% -25% of citric acid; 1% -5% of polyacrylic acid; 5% -20% of dodecyl benzene sulfonic acid; 1% -5% of a surfactant; 1% -3% of high-temperature corrosion inhibitor; 1% -5% of iron stabilizer; 1% -3% of clay stabilizer; 1% -3% of an intelligent agent; the balance being water.
The weight percentage of the citric acid in the safe and environment-friendly stratum degradation acid is 10-25%, and the preferable weight percentage is 15-20%. The citric acid can be anhydrous citric acid or citric acid with crystal water, and only the required amount of citric acid is converted when the degradation acid is prepared.
The polyacrylic acid in the safe and environment-friendly stratum degradation acid is 1-5 wt%, and the preferable wt% is 1-3%. The polyacrylic acid has a molecular weight of 2000-.
The weight percentage of the dodecylbenzene sulfonic acid in the safe and environment-friendly formation degradation acid is 5-20%, and the preferable weight percentage is 5-10%.
The surfactant in the safe and environment-friendly formation degradation acid is alcohol ether carboxylate AEC-9H or gemini quaternary ammonium salt, and the weight percentage of the surfactant is 1-5%, and the preferable weight percentage is 1-3%. Wherein the gemini surfactant is a novel degradable amide gemini quaternary ammonium salt.
The high-temperature corrosion inhibitor in the safe and environment-friendly formation degradation acid IS imidazoline IS-129 or tall oil imidazoline sulfonate, and the weight percentage of the high-temperature corrosion inhibitor IS 1-3%, and the preferable weight percentage IS 1-2%.
The iron stabilizer in the safe and environment-friendly stratum degradation acid is lactic acid, and the weight percentage of the iron stabilizer is 1-5%, and the preferable weight percentage is 1-3%.
The clay stabilizer in the safe and environment-friendly stratum degradation acid is polyacrylamide or polyquaternium-37, and the weight percentage of the clay stabilizer is 1-3%, preferably 1-2%.
The intelligent agent in the safe and environment-friendly stratum degradation acid is amino polyether organic silicon, and the weight percentage of the intelligent agent is 1-3%, and the preferable weight percentage is 1-2%.
The invention mainly solves the problem that the traditional inorganic strong-acid blocking remover damages the stratum and equipment, and the organic acid with relatively mild acidity is adopted for replacing the traditional inorganic strong-acid blocking remover, so that the blocking removing effect of the stratum degrading acid is mainly considered under the safety and environmental protection premise.
The technical indexes of the stratum degradation acid prepared by the invention are as follows:
the technical indexes of the prepared stratum degradation acid are as follows: the product index is colorless transparent liquid and slightly sour. The technical index corrosion rate is more than 20 percent; the crude oil cleaning rate is more than 65 percent; corrosion rate: less than 5%; the dynamic displacement is close to 3: 1.
The invention further discloses application of the safe and environment-friendly stratum degradation acid in effectively relieving stratum pollution of an oil well. In particular to the application of anti-swelling and sand stabilizing when the anti-swelling agent is used for acidizing and plugging removal. The experimental result shows that the anti-swelling effect is as follows: the anti-swelling rate is more than 90 percent; water washing resistance: the water washing resistance rate is more than 95 percent; high core permeability retention: > 90%; no organic chlorine is contained: no damage to subsequent crude oil dehydration treatment equipment; the compatibility with various acid solutions is good: the additive has good compatibility with acid liquor such as hydrochloric acid, hydrofluoric acid, citric acid and the like, is suitable for various blockage removal process measures, is particularly suitable for removing blockage caused by clay particles, and is a good additive for 'three-sensitive' oil reservoir construction.
When the environment-friendly stratum degradation acid disclosed by the invention is used for acidizing and deblocking, the environment-friendly stratum degradation acid has good combination stability, does not need to adopt a biological agent, can play a good role in preventing swelling and stabilizing sand, and does not have the problems of easy framework damage to the stratum, stratum collapse and easy sand production caused by conventional acidizing. In addition, the environment-friendly stratum degradation acid disclosed by the invention can effectively remove stratum pollution of an oil well when being used for acidizing and deblocking, does not cause secondary sedimentation damage of a reservoir layer, has the characteristics of waterproof lock, no corrosion to a pipe column, water sensitivity inhibition and the like, can realize efficient and rapid acidizing and deblocking field construction when being used, and is beneficial to reducing the environmental pollution risk and the construction cost in the construction.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications in the components and amounts of the materials used in these embodiments can be made without departing from the spirit and scope of the invention. The raw materials of alcohol ether carboxylate, AEC-9H, imidazoline IS-129, tall oil imidazoline sulfonate, lactic acid, polyacrylamide, polyquaternary ammonium salt-37, degradable amide gemini quaternary ammonium salt, amino polyether organic silicon and the like used in the invention are all sold in the market. The invention takes the example of configuring 1000 grams of environment-friendly formation-degrading acid.
Example 1
The preparation method of the environment-friendly type stratum degradation acid in the embodiment 1 is as follows: firstly adding 790 g of water into a batching container, heating to 75 ℃, firstly weighing 10 g of polyacrylic acid, adding the polyacrylic acid into the water, stirring for 1 hour by using a high-speed homogenizer, adding 100 g of citric acid and 50 g of dodecylbenzene sulfonic acid into the batching container after uniformly stirring, continuously stirring uniformly, and sequentially adding 10 g of AEC-9H, 10 g of IS-12910, 10 g of lactic acid, 10 g of polyacrylamide and 10 g of aminopolyether organic silicon into the batching container under the condition of keeping stirring after the system IS uniformly dispersed. Stirring at high speed for 2 hours, stopping stirring, naturally cooling, and aging for 24 hours to finish the preparation. The content of effective components is 21%.
Example 2
The preparation method of the environment-friendly type stratum degradation acid in the embodiment 2 is as follows: adding 310 g of water into a batching container, heating to 75 ℃, firstly weighing 50 g of polyacrylic acid, adding the polyacrylic acid into the water, stirring for 1 hour by using a high-speed homogenizer, adding 250 g of citric acid and 200 g of dodecylbenzene sulfonic acid into the batching container after uniformly stirring, continuously stirring uniformly, and sequentially adding 50 g of gemini surfactant, 30 g of tall oil imidazoline sulfonate, 50 g of lactic acid, 3730 g of polyquaternary ammonium salt and 30 g of aminopolyether organic silicon into the batching container under the condition of keeping stirring after the system is uniformly dispersed. Stirring at high speed for 2 hours, stopping stirring, naturally cooling, and aging for 24 hours to finish the preparation. The content of effective substance is 69%, and the effective substance refers to chemical components except water.
Example 3
The preparation method of the environment-friendly formation degradation acid in the embodiment 3 comprises the following steps: 740 g of water IS firstly added into a batching container, the water IS heated to 75 ℃, 10 g of polyacrylic acid IS firstly weighed and added into the water, the mixture IS stirred for 1 hour by a high-speed homogenizer, 150 g of citric acid and 50 g of dodecylbenzene sulfonic acid are added into the batching container after the mixture IS uniformly stirred, and then the mixture IS continuously stirred uniformly, after the system IS uniformly dispersed, 10 g of AEC-9H, 10 g of IS-12910, 10 g of lactic acid, 10 g of polyacrylamide and 10 g of amino polyether silicone oil are sequentially added into the batching container under the condition of stirring. Stirring at high speed for 2 hours, stopping stirring, naturally cooling, and aging for 24 hours to finish the preparation. The content of effective components is 26%.
Example 4
The preparation method of the environment-friendly formation degradation acid in the embodiment 4 comprises the following steps: adding 550 g of water into a batching container, heating to 75 ℃, firstly weighing 30 g of polyacrylic acid, adding the polyacrylic acid into the water, stirring for 1 hour by using a high-speed homogenizer, adding 200 g of citric acid and 100 g of dodecylbenzene sulfonic acid into the batching container after uniformly stirring, continuously stirring uniformly, and sequentially adding 30 g of gemini surfactant (degradable amide gemini quaternary ammonium salt), 30 g of IS-12920 g of lactic acid, 20 g of polyacrylamide and 20 g of amino polyether silicone oil into the batching container under the condition of keeping stirring after the system IS uniformly dispersed. Stirring at high speed for 2 hours, stopping stirring, naturally cooling, and aging for 24 hours to finish the preparation. The content of effective components is 45%.
Example 5
The preparation method of the environment-friendly formation degradation acid in the embodiment 5 comprises the following steps: adding 650 g of water into a batching container, heating to 75 ℃, firstly weighing 50 g of polyacrylic acid, adding the polyacrylic acid into the water, stirring for 1 hour by using a high-speed homogenizer, adding 100 g of citric acid and 50 g of dodecylbenzene sulfonic acid into the batching container after uniformly stirring, continuously stirring uniformly, and sequentially adding 50 g of AEC-9H, 10 g of tall oil imidazoline sulfonate, 50 g of lactic acid, 3710 g of polyquaternium and 30 g of aminopolyether silicone oil into the batching container under the condition of keeping stirring after the system is uniformly dispersed. Stirring at high speed for 2 hours, stopping stirring, naturally cooling, and aging for 24 hours to finish the preparation. The content of effective components is 35%.
Example 6
The preparation method of the environment-friendly type stratum degradation acid in the embodiment 6 is as follows: adding 450 g of water into a batching container, heating to 75 ℃, firstly weighing 10 g of polyacrylic acid, adding the polyacrylic acid into the water, stirring for 1 hour by using a high-speed homogenizer, adding 250 g of citric acid and 200 g of dodecylbenzene sulfonic acid into the batching container after uniformly stirring, continuously stirring uniformly, and sequentially adding 10 g of gemini surfactant (degradable amide gemini quaternary ammonium salt), 30 g of tall oil imidazoline sulfonate, 10 g of lactic acid, 30 g of polyacrylamide and 10 g of amino polyether silicone oil into the batching container under the condition of keeping stirring after the system is uniformly dispersed. Stirring at high speed for 2 hours, stopping stirring, naturally cooling, and aging for 24 hours to finish the preparation. The content of effective components is 55%.
Example 7
In the comparative experiment for effectively removing the stratum pollution of the oil well, the stratum degradation acid invented in the example 1 is compared with the traditional strong acid blocking remover (hydrochloric acid + fluoboric acid system), and the experimental results are as follows:
| type (B) | Expansion prevention rate | Water resistance rate | Permeability retention |
| Example 1 | 90.2% | 98.7% | 92.5% |
| Traditional acid | 88.1% | 91.0% | 86.0% |
Experimental data show that the effect of the formation degradation acid provided by the invention is obviously improved compared with that of the traditional strong acid product, and the formation degradation acid has excellent market value.
Claims (7)
1. The safe and environment-friendly stratum degradation acid is characterized by comprising the following raw materials in percentage by weight:
10% -25% of citric acid;
1% -5% of polyacrylic acid;
5% -20% of dodecyl benzene sulfonic acid;
1% -5% of a surfactant;
1% -3% of high-temperature corrosion inhibitor;
1% -5% of iron stabilizer;
1% -3% of clay stabilizer;
1% -3% of an intelligent agent;
the balance of water;
the surfactant refers to alcohol ether carboxylate AEC-9H or gemini surfactant;
wherein the gemini surfactant is degradable amide gemini quaternary ammonium salt;
the high-temperature corrosion inhibitor refers to imidazoline IS-129 or tall oil imidazoline sulfonate;
the iron stabilizer refers to lactic acid;
the clay stabilizer refers to polyacrylamide or polyquaternium-37;
the intelligent agent is amino polyether organic silicon.
2. The safe and environmentally friendly formation degrading acid of claim 1 wherein the weight percent of citric acid is 15% to 20%; the citric acid is anhydrous citric acid or citric acid with crystal water; the weight percentage of the polyacrylic acid is 1-3%, and the molecular weight is 2000-5000-.
3. The safe and environment-friendly formation-degrading acid of claim 1 wherein the dodecylbenzene sulfonic acid is present in an amount of 5% to 10% by weight; the surfactant is alcohol ether carboxylate AEC-9H or gemini quaternary ammonium salt, and the weight percentage of the surfactant is 1-3%; the high-temperature corrosion inhibitor IS imidazoline IS-129 or tall oil imidazoline sulfonate, and the weight percentage of the high-temperature corrosion inhibitor IS 1-2%; the iron stabilizer is lactic acid, and the weight percentage of the iron stabilizer is 1-3%; the clay stabilizer is polyacrylamide or polyquaternium-37, and the weight percentage of the clay stabilizer is 1-2%; the intelligent agent is amino polyether organic silicon, and the weight percentage of the intelligent agent is 1-2%.
4. Use of the safe and environment-friendly formation-degrading acid of claim 1 for effectively decontaminating a formation of an oil well.
5. The use as claimed in claim 4, wherein the formation contamination effective for relieving oil wells comprises iron and ferrous iron scale, carbonic alkaline earth metal scale, formation particulate migration plugging and organic plugging.
6. The use of the safe and environment-friendly formation-degrading acid of claim 1 for the prevention of swelling and stabilizing sand during acidizing and plug removal.
7. The use of claim 6, wherein the anti-swelling sand stabilizing means for acidizing and plugging removal: the inorganic scale precipitation is removed, the generation of secondary acidification precipitation is prevented and removed, the clay volume expansion is prevented, and the stratum blockage is reduced.
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