CN117903779A - Sandstone retarded acid and application thereof - Google Patents
Sandstone retarded acid and application thereof Download PDFInfo
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- CN117903779A CN117903779A CN202211234804.9A CN202211234804A CN117903779A CN 117903779 A CN117903779 A CN 117903779A CN 202211234804 A CN202211234804 A CN 202211234804A CN 117903779 A CN117903779 A CN 117903779A
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- 239000002253 acid Substances 0.000 title claims abstract description 77
- 239000002738 chelating agent Substances 0.000 claims abstract description 79
- 150000001413 amino acids Chemical class 0.000 claims abstract description 69
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 238000011161 development Methods 0.000 claims abstract description 10
- 235000001014 amino acid Nutrition 0.000 claims description 67
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 66
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 50
- 229920000805 Polyaspartic acid Polymers 0.000 claims description 28
- 108010064470 polyaspartate Proteins 0.000 claims description 28
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 24
- 229920000642 polymer Polymers 0.000 claims description 24
- 239000000176 sodium gluconate Substances 0.000 claims description 24
- 229940005574 sodium gluconate Drugs 0.000 claims description 24
- 235000012207 sodium gluconate Nutrition 0.000 claims description 24
- 230000007797 corrosion Effects 0.000 claims description 19
- 238000005260 corrosion Methods 0.000 claims description 19
- 239000003112 inhibitor Substances 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000006116 polymerization reaction Methods 0.000 claims description 8
- -1 quinoline quaternary ammonium compounds Chemical class 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- KDXKERNSBIXSRK-UHFFFAOYSA-N lysine Chemical compound NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 claims description 7
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 5
- 235000013922 glutamic acid Nutrition 0.000 claims description 5
- 239000004220 glutamic acid Substances 0.000 claims description 5
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-N 0.000 claims description 4
- 239000004472 Lysine Substances 0.000 claims description 4
- 235000003704 aspartic acid Nutrition 0.000 claims description 4
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 claims description 4
- 235000018977 lysine Nutrition 0.000 claims description 4
- RREANTFLPGEWEN-MBLPBCRHSA-N 7-[4-[[(3z)-3-[4-amino-5-[(3,4,5-trimethoxyphenyl)methyl]pyrimidin-2-yl]imino-5-fluoro-2-oxoindol-1-yl]methyl]piperazin-1-yl]-1-cyclopropyl-6-fluoro-4-oxoquinoline-3-carboxylic acid Chemical group COC1=C(OC)C(OC)=CC(CC=2C(=NC(\N=C/3C4=CC(F)=CC=C4N(CN4CCN(CC4)C=4C(=CC=5C(=O)C(C(O)=O)=CN(C=5C=4)C4CC4)F)C\3=O)=NC=2)N)=C1 RREANTFLPGEWEN-MBLPBCRHSA-N 0.000 claims description 3
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 claims description 3
- 108010020346 Polyglutamic Acid Proteins 0.000 claims description 3
- 108010039918 Polylysine Proteins 0.000 claims description 3
- SMWDFEZZVXVKRB-UHFFFAOYSA-N anhydrous quinoline Natural products N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 claims description 3
- MSJMDZAOKORVFC-UAIGNFCESA-L disodium maleate Chemical compound [Na+].[Na+].[O-]C(=O)\C=C/C([O-])=O MSJMDZAOKORVFC-UAIGNFCESA-L 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 235000010755 mineral Nutrition 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 229920002643 polyglutamic acid Polymers 0.000 claims description 3
- 229920000656 polylysine Polymers 0.000 claims description 3
- 239000001509 sodium citrate Substances 0.000 claims description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 3
- 230000000979 retarding effect Effects 0.000 abstract description 38
- 229910021645 metal ion Inorganic materials 0.000 abstract description 23
- 238000001556 precipitation Methods 0.000 abstract description 23
- 230000020477 pH reduction Effects 0.000 abstract description 21
- 230000035699 permeability Effects 0.000 abstract description 21
- 239000013522 chelant Substances 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 17
- 239000002244 precipitate Substances 0.000 abstract description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract description 3
- 239000011591 potassium Substances 0.000 abstract description 3
- 229910052700 potassium Inorganic materials 0.000 abstract description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 21
- 239000011435 rock Substances 0.000 description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 10
- 230000003628 erosive effect Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 7
- 238000004090 dissolution Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000002401 inhibitory effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- 230000009920 chelation Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 4
- 229910001424 calcium ion Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 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 2
- 230000000903 blocking effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010931 ester hydrolysis Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 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 description 1
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical compound NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- WDLRUFUQRNWCPK-UHFFFAOYSA-N Tetraxetan Chemical class OC(=O)CN1CCN(CC(O)=O)CCN(CC(O)=O)CCN(CC(O)=O)CC1 WDLRUFUQRNWCPK-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000000184 acid digestion Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 125000000291 glutamic acid group Chemical group N[C@@H](CCC(O)=O)C(=O)* 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 125000003588 lysine group Chemical group [H]N([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])(N([H])[H])C(*)=O 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- UZVUJVFQFNHRSY-OUTKXMMCSA-J tetrasodium;(2s)-2-[bis(carboxylatomethyl)amino]pentanedioate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CC[C@@H](C([O-])=O)N(CC([O-])=O)CC([O-])=O UZVUJVFQFNHRSY-OUTKXMMCSA-J 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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Abstract
The application provides sandstone retarded acid and application thereof. The sandstone retarded acid comprises the following components in parts by weight: 5-15 parts of amino acid chelating agent, 1-10 parts of hydroxycarboxylic acid chelating agent, 2-8 parts of inorganic acid and 65-90 parts of solvent. The sandstone retarding acid provided by the application has both retarding effect and metal ion chelating effect, and can be applied to the technical field of oil and gas field development to improve the core permeability after acidification and inhibit the generation of secondary precipitates such as calcium fluoride, potassium fluosilicate, silicic acid and the like. The weight portions of the amino acid chelating agent, the hydroxycarboxylic acid chelating agent, the inorganic acid and the solvent are limited in the range, so that the chelating reaction efficiency is improved, the chelate generation rate is improved, the core permeability after acidification is improved, and the secondary precipitation generation is inhibited.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to sandstone retarded acid and application thereof.
Background
For low-permeability sandstone oil and gas reservoirs or near-well zones with serious pollution, the acid-digestion, blockage removal and yield increase are required. The conventional sandstone unblocking acid liquor is earth acid, and is formed by mixing hydrochloric acid and hydrofluoric acid according to different proportions. When the earth acid system is used for acidizing construction, as the reaction speed of the earth acid system and rock is too high, the acid liquor is excessively consumed in a near-well zone, so that the acid liquor has short acting distance and limited blocking removing distance, the transformation task cannot be met frequently, and after the hydrofluoric acid in the earth acid is reacted, anions and cations in the solution react to generate secondary precipitates such as calcium fluoride, potassium fluosilicate, silicic acid and the like, so that the effect of acidizing transformation is severely restricted.
The sandstone acidification slowing has a large influence on the acidification effect, so that the sandstone acidification slowing research is very important. At present, researchers perform sandstone acidification retarding research by utilizing the principles of multistage ionization of phosphoric acid, ester hydrolysis and the like. The prior document (publication No. CN 101712864A) discloses a multi-hydrogen acid injection enhancer for sandstone oil fields, which has a main component of phosphoric acid and has a certain retarding effect by utilizing multistage ionization of the phosphoric acid. The prior document (publication No. CN 1524922A) discloses a sandstone thin oil layer composite acid blocking remover which consists of hydrochloric acid, citric acid, acetic acid, organic phosphoric acid, ammonium bifluoride, sodium dodecyl benzene sulfonate and ethanol, and organic quaternary ammonium salt CT-3, and the dosage proportion of the agent is limited. The prior document (publication No. CN 105295886A) discloses a compound retarded acid, wherein the main component of the compound retarded acid is methyl formate, formic acid is obtained by hydrolysis reaction, and the formic acid reacts with ammonium fluoride to generate required hydrofluoric acid, so that the effect of retarding the reaction rate between acid rocks is achieved.
For the problem of secondary precipitation generated by sandstone acidification, a plurality of scholars use chelating agents to chelate metal ions, so that the metal ions generated in the stratum are chelated into chelate, and the damage of secondary precipitation is reduced. The prior document (publication No. CN 108373911A) discloses a chelating and unblocking liquid applied to a medium-high permeability sandstone reservoir, the components of the chelating and unblocking liquid take DOTA derivatives as main components, so that the defect of conventional acidification can be avoided, and the problem that a common chelating agent cannot erode clay can be solved. Prior document (publication No. CN103261364 a) discloses a method and fluid for increasing the permeability of a sandstone formation using a chelating agent, wherein the method of treating the sandstone formation comprises introducing a fluid comprising glutamic acid N, N-diacetic acid or a salt thereof, and having a pH of 1-14, into the formation. In the method, the GLDA chelating agent can be used for effectively improving the permeability of the sandstone stratum.
The existing sandstone retarded acid mostly improves the acid liquor retarding effect in the aspects of improving the acid liquor viscosity, utilizing phosphoric acid multilevel ionization, ester hydrolysis and the like, but the thickening agent is used for improving the acid liquor concentration to cause polymer injury, pollute a reservoir, the phosphoric acid retarded acid pollutes the environment, is difficult to degrade biologically, and the ester retarded acid does not have the performance of inhibiting secondary precipitation and the like.
From the foregoing, it can be seen that the sandstone acidizing fluid has a wide variety of types, but the following problems still remain: (1) The acid liquor system can not achieve the effects of retarding and chelating metal ions at the same time; (2) The acid liquor additive has poor biological environmental protection, such as phosphoric acid chelating agent can cause eutrophication of water body, and the amino carboxylic acid chelating agent has poor biodegradability and poor environmental protection.
As such, it is necessary to research and develop a sandstone retarder that is environmentally friendly and simultaneously satisfies the retarding effect and the effect of chelating metal ions, thereby inhibiting secondary precipitation.
Disclosure of Invention
The invention mainly aims to provide sandstone retarded acid and application thereof, so as to solve the problem that the sandstone retarded acid in the prior art cannot simultaneously meet the retarding effect and chelate metal ions, thereby inhibiting secondary precipitation.
In order to achieve the above purpose, the present invention provides, in one aspect, a sandstone retarder comprising, in parts by weight: 5-15 parts of amino acid chelating agent, 1-10 parts of hydroxycarboxylic acid chelating agent, 2-8 parts of inorganic acid and 65-90 parts of solvent.
Further, the amino acid chelating agent is selected from amino acids and/or amino acid polymers.
Further, the amino acid is selected from one or more of the group consisting of aspartic acid, lysine and glutamic acid; the amino acid polymer is selected from one or more of the group consisting of polyaspartic acid, polylysine and polyglutamic acid; preferably, the number average molecular weight of the amino acid polymer is 1.3 to 130 tens of thousands, or the polymerization degree of the amino acid polymer is 100 to 10000; the number average molecular weight of the amino acid polymer is more preferably 1.3 to 13 tens of thousands, or the polymerization degree of the amino acid polymer is more preferably 100 to 1000.
Further, the weight ratio of the amino acid chelating agent to the hydroxycarboxylic acid chelating agent is (7-10): 5-8.
Further, the hydroxycarboxylic acid chelating agent is selected from one or more of the group consisting of sodium gluconate, sodium citrate and sodium maleate; preferably, the hydroxycarboxylic acid chelating agent is selected from sodium gluconate; more preferably, when the amino acid chelating agent is selected from polyaspartic acid, the hydroxycarboxylic acid chelating agent is selected from sodium gluconate, the weight ratio of polyaspartic acid to sodium gluconate is (7-9): 7-8.
Further, the inorganic acid is selected from hydrofluoric acid, or a mixture of hydrochloric acid and hydrofluoric acid; preferably, the inorganic acid comprises a mixture of hydrochloric acid and hydrofluoric acid, and the weight ratio of the hydrochloric acid to the hydrofluoric acid is (1-5): 1-3.
Further, the sandstone retarded acid also comprises the following components in parts by weight: 0.5-1 part of corrosion inhibitor; preferably, the corrosion inhibitor is selected from Mannich bases and/or quinoline quaternary ammonium compounds.
Further, the solvent is selected from one or more of water and methanol with a weight concentration of 1-5%.
Further, the sandstone retarded acid comprises the following components in parts by weight: 7-9 parts of amino acid chelating agent, 7-8 parts of hydroxycarboxylic acid chelating agent, 3-5 parts of hydrochloric acid, 2-3 parts of hydrofluoric acid, 0.5-1 part of corrosion inhibitor and 74-80.5 parts of solvent.
In order to achieve the purpose, the application also provides an application of the sandstone retarded acid in the technical field of oil and gas field development.
By applying the technical scheme of the invention, the amino acid chelating agent has amino and carboxyl groups at the same time, can generate multi-stage ionization, has retarding property, and can generate chelating reaction with metal ions (such as calcium ions and iron ions) in an oil layer to form chelates, so that the amino acid chelating agent can be applied to the development process of oil and gas fields to increase the reaction distance of acid rocks and improve the acidification effect; meanwhile, the generation of sandstone acidification secondary precipitation can be reduced; in addition, the amino acid chelating agent is environment-friendly and degradable, and is harmless to a reservoir in the development process of an oil-gas field. The carboxyl carboxylic acid chelating agent has hydroxyl and carboxyl, can generate multistage ionization, has retarding property, and can chelate metal ions (such as calcium ions and iron ions) in an oil layer to form chelate, thereby playing a role in descaling. The amino acid chelating agent and the carboxyl carboxylic acid chelating agent can play a synergistic effect of the amino acid chelating agent and the carboxyl carboxylic acid chelating agent, and can play a retarding effect of sandstone retarding acid and an effect of chelating metal ions better, so that secondary precipitation is inhibited.
The weight portions of the amino acid chelating agent, the hydroxycarboxylic acid chelating agent, the inorganic acid and the solvent are limited in the range, so that the chelating reaction efficiency is improved, the chelate generation rate is improved, the core permeability after acidification is improved, and the secondary precipitation generation is inhibited.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The present application will be described in detail with reference to examples.
As described in the background art, the existing sandstone retarded acid has the problem that the retarded action and the chelation of metal ions can not be simultaneously satisfied, thereby inhibiting secondary precipitation. In order to solve the technical problems, the application provides sandstone retarded acid, which comprises the following components in parts by weight: 5-15 parts of amino acid chelating agent, 1-10 parts of hydroxycarboxylic acid chelating agent, 2-8 parts of inorganic acid and 65-90 parts of solvent.
The amino acid chelating agent has amino and carboxyl groups, can generate multi-stage ionization, has retarding property, and can generate chelating reaction with metal ions (such as calcium ions and iron ions) in an oil layer to form chelate, so that the amino acid chelating agent can increase the acid rock reaction distance and improve the acidification effect when applied to the development process of oil and gas fields; meanwhile, the generation of sandstone acidification secondary precipitation can be reduced; in addition, the amino acid chelating agent is environment-friendly and degradable, and is harmless to a reservoir in the development process of an oil-gas field. The carboxyl carboxylic acid chelating agent has hydroxyl and carboxyl, can generate multistage ionization, has retarding property, and can chelate metal ions (such as calcium ions and iron ions) in an oil layer to form chelate, thereby playing a role in descaling. The amino acid chelating agent and the carboxyl carboxylic acid chelating agent can play a synergistic effect of the amino acid chelating agent and the carboxyl carboxylic acid chelating agent, and can play a retarding effect of sandstone retarding acid and an effect of chelating metal ions better, so that secondary precipitation is inhibited.
The weight portions of the amino acid chelating agent, the hydroxycarboxylic acid chelating agent, the inorganic acid and the solvent are limited in the range, so that the chelating reaction efficiency is improved, the chelate generation rate is improved, the core permeability after acidification is improved, and the secondary precipitation generation is inhibited.
In the present application, the reaction distance of the acid rock means: the distance travelled by sandstone retarded acid from fresh acid to residual acid.
Amino acids are organic compounds containing basic amino groups and acidic carboxyl groups. In a preferred embodiment, the amino acid chelating agent includes, but is not limited to, amino acids and/or amino acid polymers.
In a preferred embodiment, the amino acids include, but are not limited to, one or more of the group consisting of aspartic acid, lysine, and glutamic acid; the amino acid polymer includes, but is not limited to, one or more of the group consisting of polyaspartic acid, polylysine, and polyglutamic acid. Compared with other types, the amino acid and/or amino acid polymer of the preferred type is beneficial to further playing the chelating role, improving the chelating efficiency, further improving the core permeability and inhibiting the generation of secondary precipitation.
In order to further improve the chelating ability of the amino acid polymer, thereby further improving the chelating efficiency and core permeability of the sandstone retarded acid, it is preferable that the number average molecular weight of the amino acid polymer is 1.3 to 130 tens of thousands, or the polymerization degree of the amino acid polymer is 100 to 10000. More preferably, the number average molecular weight of the amino acid polymer is 1.3 to 13 tens of thousands, and the polymerization degree of the amino acid polymer is 100 to 1000. For example, polyaspartic acid having a degree of polymerization of 200, 300 or 500 may be used.
In a preferred embodiment, the weight ratio of amino acid chelating agent to hydroxycarboxylic acid chelating agent is (7-10): 5-8. The weight ratio of the amino acid chelating agent to the hydroxycarboxylic acid chelating agent comprises but is not limited to the above range, and the limitation of the weight ratio in the above range is beneficial to better exert the synergistic effect of the amino acid chelating agent and the hydroxycarboxylic acid chelating agent, further improving the chelating reaction efficiency and improving the chelate generation rate; meanwhile, the core permeability after acidification is further improved, and the generation of secondary precipitation is further restrained.
In a preferred embodiment, the hydroxycarboxylic acid chelating agent includes, but is not limited to, one or more of the group consisting of sodium gluconate, sodium citrate, and sodium maleate. Compared with other types, the hydroxycarboxylic acid chelating agent of the type is beneficial to improving the effect of chelating divalent and/or trivalent metal ions, further plays a role in descaling, and is beneficial to further reducing the generation of secondary precipitation. To further perform the descaling function, the formation of secondary precipitates is reduced even further, preferably hydroxycarboxylic acid chelating agents including, but not limited to, sodium gluconate.
In a preferred embodiment, when the amino acid chelating agent includes, but is not limited to, polyaspartic acid, the hydroxycarboxylic acid chelating agent includes, but is not limited to, sodium gluconate, the weight ratio of polyaspartic acid to sodium gluconate is (7-9): 7-8. The weight ratio of the polyaspartic acid to the sodium gluconate comprises but is not limited to the range, and the polyaspartic acid is limited to the range, so that the chelating reaction efficiency is further improved, and the chelate generation rate is improved; meanwhile, the core permeability after acidification is further improved, and the generation of secondary precipitation is further restrained.
The inorganic acid may be a weak acid commonly used in the art, or a combination of a weak acid and a strong acid. In a preferred embodiment, the mineral acid includes, but is not limited to, hydrofluoric acid, or a mixture of hydrochloric acid and hydrofluoric acid. Compared with the adoption of a strong acid system, the adoption of the incompletely ionized inorganic acid is beneficial to further enhancing the retarding characteristic of sandstone retarding acid.
In a preferred embodiment, the mineral acid includes, but is not limited to, a mixture of hydrochloric acid and hydrofluoric acid, and the weight ratio of hydrochloric acid to hydrofluoric acid is (1-5): (1-3). The weight ratio of the hydrochloric acid to the hydrofluoric acid comprises but is not limited to the range, and the weight ratio is limited to the range, so that the retarder is favorable for further playing the retarding characteristic of sandstone retarder, and has better retarding and metal ion chelating effects.
In a preferred embodiment, the sandstone retarding acid further comprises, in parts by weight: 0.5 to 1 part of corrosion inhibitor. Preferably, the corrosion inhibitors include, but are not limited to, mannich bases and/or quinoline quaternary ammonium compounds. The corrosion inhibitor with the weight parts is beneficial to forming a more complete hydrophobic protective film on the surface of the shaft steel, and further is beneficial to inhibiting corrosion of sandstone retarded acid to rock stratum. For example, DCA-6, KMS-6 (Beijing family Maishi oilfield chemical technologies Co., ltd.) may be used.
In a preferred embodiment, the solvent includes, but is not limited to, one or more of the group consisting of water, 1% to 5% methanol by weight.
In a preferred embodiment, the sandstone retarding acid comprises, in parts by weight: 7-9 parts of amino acid chelating agent, 7-8 parts of hydroxycarboxylic acid chelating agent, 3-5 parts of hydrochloric acid, 2-3 parts of hydrofluoric acid, 0.5-1 part of corrosion inhibitor and 74-80.5 parts of solvent. Compared with other ranges, the dosage of each component in the sandstone retarded acid is limited in the range, so that the chelating reaction efficiency is further improved, the chelate generation rate is further improved, the core permeability after acidification is further improved, and the generation of secondary precipitation is further inhibited.
The second aspect of the application also provides an application of the sandstone retarded acid in the technical field of oil and gas field development.
The sandstone retarding acid provided by the application has both retarding effect and metal ion chelating effect, and can be applied to the technical field of oil and gas field development to improve the core permeability after acidification and inhibit the generation of secondary precipitates such as calcium fluoride, potassium fluosilicate, silicic acid and the like.
The application is described in further detail below in connection with specific examples which are not to be construed as limiting the scope of the application as claimed.
Example 1
The sandstone retarded acid comprises the following components in parts by weight: 5 parts of polyaspartic acid, 1 part of sodium gluconate, 1 part of corrosion inhibitor (DCA-6, beijing family Maishi oilfield chemical technology Co., ltd.), 3 parts of hydrofluoric acid and 90 parts of water, and are shown in Table 1. Wherein the polymerization degree of the polyaspartic acid is 200.
(1) Mixing 30mL of sandstone retarded acid to be tested with 1.5g of rock powder (purple mud spring subgroup, granularity range is 0.27-0.55 mm), stirring at 90 ℃ for reaction, finishing the reaction after 1h or 4h, rapidly cooling with water, filtering the reaction solution, drying, weighing the weight of the residual rock powder, recording the weight percentage of the corrosion part of the rock powder to the weight of the original rock powder as the corrosion rate, and calculating to obtain the 1h corrosion rate and the 4h corrosion rate.
(2) Preparing a mixed dispersion liquid of polyaspartic acid and sodium gluconate with the concentration of 1mol/L for later use (the weight ratio of polyaspartic acid to sodium gluconate is 5:1); placing V 1 =5 mL of the mixed dispersion liquid into a conical flask, adding 7.5mL of 5% hydrofluoric acid solution to enable the concentration of hydrofluoric acid in the mixed system to be 3%, adjusting the pH value of the mixed system to be 3-4 by using hydrochloric acid solution or sodium hydroxide solution (simulating an acidic environment), titrating by using FeCl 3 or CaCl 2 solution with the concentration of 1mol/L (chelation reaction occurs in the process), keeping the pH value of the process to be 3-4 all the time until precipitation is generated and does not disappear, recording the using amount V 2 of the FeCl 3 or CaCl 2 solution, calculating the chelation value C (weight of metal ions, weight of mg/pure chelant, g) according to the following formula, repeating the test for 3 times, and taking an average value.
Wherein, C is the chelation value, mg.g -1;V1 is the volume of the chelating agent solution and mL; v 2 is the volume of the solution of the consumed metal ions for titration, and mL; m 1 is the molecular weight of metal ions, g/mol; m 2 is the molecular weight of the chelating agent, g/mol.
(3) The permeability of the core before and after acidification was measured with the aid of a core flowmeter using formation water and the percentage increase in permeability (noted core permeability/%) was calculated.
Example 2
The sandstone retarded acid comprises the following components in parts by weight: 5 parts of polyaspartic acid, 5 parts of sodium gluconate, 1 part of corrosion inhibitor (DCA-6, beijing family Maishi oilfield chemical technology Co., ltd.), 3 parts of hydrofluoric acid and 86 parts of water, and are shown in Table 1.
In this example, the test conditions were the same as in example 1.
TABLE 1
Example 3
The sandstone retarded acid comprises the following components in parts by weight: 5 parts of polyaspartic acid, 5 parts of sodium gluconate, 1 part of corrosion inhibitor (DCA-6, beijing family Maishi oilfield chemical technology Co., ltd.), 3 parts of hydrofluoric acid, 5 parts of hydrochloric acid and 71 parts of water, and are shown in Table 2. Wherein the inorganic acid is a mixture of hydrofluoric acid and hydrochloric acid, and the weight ratio of the hydrochloric acid to the hydrofluoric acid is 5:3.
In this example, the test conditions were the same as in example 1.
Example 4
The difference from example 3 is that: the mixture of hydrochloric acid and hydrofluoric acid is 1:1.
In this example, the test conditions were the same as in example 3.
Example 5
The difference from example 3 is that: the weight ratio of hydrochloric acid to hydrofluoric acid is 10:3.
In this example, the test conditions were the same as in example 3.
Example 6
The difference from example 1 is that: the inorganic acid is a mixture of hydrofluoric acid and hydrochloric acid, and the weight ratio of the hydrofluoric acid to the hydrochloric acid is 3:10, and the details are shown in table 2.
In this example, the test conditions were the same as in example 1.
TABLE 2
Example 7
The difference from example 1 is that: the amounts of the components in the sandstone retarder are different, and are shown in Table 3.
In this example, the test conditions were the same as in example 1.
Example 8
The difference from example 1 is that: the amounts of the components in the sandstone retarder are different, and are shown in Table 3.
In this example, the test conditions were the same as in example 1.
TABLE 3 Table 3
Example 9
The difference from example 1 is that: the number average molecular weight of the polyaspartic acid is 1.3 ten thousand.
In this example, the test conditions were the same as in example 1.
Example 10
The difference from example 1 is that: the number average molecular weight of the polyaspartic acid is 13 ten thousand.
In this example, the test conditions were the same as in example 1.
Example 11
The difference from example 1 is that: the number average molecular weight of the polyaspartic acid is 1 ten thousand.
In this example, the test conditions were the same as in example 1.
Example 12
The difference from example 1 is that: the weight ratio of the polyaspartic acid to the sodium gluconate is 7:8.
In this example, the test conditions were the same as in example 1.
Example 13
The difference from example 1 is that: the weight ratio of the polyaspartic acid to the sodium gluconate is 10:8.
Example 14
The difference from example 1 is that: the weight ratio of the polyaspartic acid to the sodium gluconate is 9:7.
In this example, the test conditions were the same as in example 1.
Example 15
The difference from example 1 is that: the amino acid chelating agent is aspartic acid.
In this example, the test conditions were the same as in example 1.
Example 16
The difference from example 1 is that: the amino acid chelating agent is lysine.
In this example, the test conditions were the same as in example 1.
Example 17
The difference from example 1 is that: the amino acid chelating agent is glutamic acid.
In this example, the test conditions were the same as in example 1.
Comparative example 1
The difference from example 1 is that: the sandstone retarder acid does not contain sodium gluconate.
The sandstone retarded acid chelated metal ion performance test method prepared in comparative example 1 is as follows:
Preparing polyaspartic acid dispersion liquid with the concentration of 1mol/L, putting 5mL into a conical flask, adding 7.5mL of hydrofluoric acid solution with the concentration of 5% to enable the concentration of hydrofluoric acid in a mixed system to reach 3%, adjusting the pH value to be 3-4 by using hydrochloric acid solution or sodium hydroxide solution (simulating an acidic environment), titrating by using FeCl 3 or CaCl 2 solution with the concentration of 1mol/L, keeping the pH value of the process to be 3-4 all the time until precipitation is generated and does not disappear, and calculating a chelation value (the calculation method is the same as that of example 4).
The retarding performance test conditions of the sandstone retarding acid prepared in comparative example 1 were the same as those of example 1.
Comparative example 2
The difference from example 1 is that: the sandstone retarder contains no polyaspartic acid component, and the rest components and the dosage are the same as those in the example 1.
Each test condition in this comparative example 2 was the same as in example 1.
The sandstone retarder prepared in examples 1 to 17 and the sandstone retarder prepared in comparative examples above were subjected to retarder performance tests (including rock powder dissolution rates of 1h and 4h and dissolution rate change rates) using the same test method as in example 1, and the test results are summarized in table 4, wherein the dissolution rate change rates refer to: the difference between the erosion rate of the rock powder for 4h and the erosion rate of the rock powder for 1h accounts for the percentage (%) of the erosion rate of the rock powder for 1 h;
The sandstone retarder acid prepared in examples 1 to 17 and the sandstone retarder acid prepared in comparative example above were subjected to the chelate metal ion property test (Ca 2+ chelate value, fe 3+ chelate value) and the core permeability test using the same test method as in example 1, and the test results are summarized in table 5.
TABLE 4 Table 4
| 1H erosion Rate (%) | 4H erosion Rate (%) | Corrosion rate change rate (%), 90 ℃ C.) for 1-4 h period | |
| Example 1 | 12.4 | 23.9 | 92.74 |
| Example 2 | 11.3 | 24.4 | 83.46 |
| Example 3 | 15.2 | 30.5 | 100.66 |
| Example 4 | 13.6 | 28.5 | 109.56 |
| Example 5 | 15.9 | 31.0 | 87.88 |
| Example 6 | 16.3 | 32.3 | 98.16 |
| Example 7 | 12.1 | 24.6 | 103.31 |
| Example 8 | 13.5 | 28.7 | 100.70 |
| Example 9 | 12.5 | 24.4 | 95.20 |
| Example 10 | 12.2 | 25.4 | 111.67 |
| Example 11 | 12.4 | 26.0 | 120.34 |
| Example 12 | 10.7 | 22.5 | 110.28 |
| Example 13 | 10.3 | 22.4 | 117.48 |
| Example 14 | 10.9 | 22.8 | 117.14 |
| Example 15 | 13.1 | 23.8 | 81.68 |
| Example 16 | 11.9 | 23.5 | 97.48 |
| Example 17 | 12.6 | 24.1 | 91.27 |
| Comparative example 1 | 14.3 | 24.4 | 21.35 |
| Comparative example 2 | 19.2 | 23.3 | 92.74 |
TABLE 5
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
Comparing examples 1 and 2, 7 and 8 and comparative examples 1 and 2, the rock dust of comparative examples 1 and 2 has a 1h erosion rate greater than that of examples 1, 2, 7 and 8, which indicates that the retarding performance of the sandstone retarder prepared in examples 1 and 2, 7 and 8 is superior to that of comparative examples 1 and 2 at an initial stage (0 to 1h at 90 ℃). The amino acid chelating agent and the carboxyl carboxylic acid chelating agent are compounded for use, so that the synergistic effect of the amino acid chelating agent and the carboxyl carboxylic acid chelating agent can be brought into play, the retarding effect of sandstone retarding acid and the effect of chelating metal ions can be better brought into play, secondary precipitation is restrained, and the amino acid chelating agent, the hydroxyl carboxylic acid chelating agent, the inorganic acid and the solvent are limited in the preferred range of the application, so that the chelating reaction efficiency is favorably improved, the chelate generation rate is improved, the core permeability after acidification is favorably improved, and the secondary precipitation generation is favorably restrained. It should be noted that the rock dust dissolution rates in examples 1 and 2 and comparative examples 1 and 2 were substantially the same for 4 hours, because the inorganic acid component in the sandstone retarded acid was almost completely consumed at 4 hours, that is, the dissolution of the rock dust by the sandstone retarded acid was already complete.
The 1h erosion rates of examples 3 and 4 were 15.2% and 13.6%, respectively, while the 1h erosion rate of the rock powder in example 5 was higher than that of examples 3 and 4 and was 15.9%. It is clear that the retarding performance of the sandstone retarding acid prepared in example 5 is inferior to that of examples 3 and 4 in the initial stage (0 to 1h at 90 ℃). Similarly, comparing examples 1 and 6, the 1h erosion rate of the rock powder in example 6 is as high as 16.3%, which is significantly higher than that in example 1. Therefore, the weight ratio of the hydrochloric acid to the hydrofluoric acid comprises but is not limited to the preferred range of the application, and the preferred range of the application is limited to be favorable for further playing the retarding characteristic of sandstone retarding acid, so that the sandstone retarding acid has better effect of retarding and chelating metal ions. It should be noted that, after 4 hours, the dissolution of the rock powder by the sandstone retarder in examples 3 to 5 was maximized, and the inorganic acid component in the sandstone retarder was almost completely consumed, so that the dissolution rate change rate of the examples 5 in the period of 1 hour to 4 hours was greater than that of examples 3 and 4, respectively, in table 4, which is a normal phenomenon.
Comparing examples 1, 9 to 11, it is clear that the sandstone retarder prepared in examples 1, 9 to 11 does not differ much in terms of retarder properties at the initial stage (at 90 ℃ C., 0 to 1 h) but only at the second stage (at 90 ℃ C., 1h to 4 h). From the data in table 4 it is evident that the retarding performance of the sandstone retarding acids prepared in examples 1, 9 and 10 is better than that of example 12. The number average molecular weight of the amino acid polymer comprises but is not limited to the preferred range of the application, and limiting the number average molecular weight to the preferred range of the application is beneficial to further improving the chelating ability of the amino acid polymer, thereby further improving the chelating efficiency and core permeability of sandstone retarded acid.
Comparing examples 1, 12 and 13, it is known that the weight ratio of polyaspartic acid to sodium gluconate includes, but is not limited to, the preferred range of the present application, and limiting the weight ratio to the preferred range of the present application is beneficial to better exert the synergistic effect of the polyaspartic acid and sodium gluconate, and is beneficial to further improving the chelating reaction efficiency and the chelate generation rate; meanwhile, the core permeability after acidification is further improved, and the generation of secondary precipitation is further restrained.
As is clear from comparison of examples 1, 15 to 17, the amino acid or amino acid polymer of the preferred species of the present application is advantageous in further exerting its chelating effect, in improving the chelating efficiency, in turn, in improving the core permeability and in suppressing the formation of secondary precipitates, as compared with other species.
It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The sandstone retarder is characterized by comprising the following components in parts by weight: 5-15 parts of amino acid chelating agent, 1-10 parts of hydroxycarboxylic acid chelating agent, 2-8 parts of inorganic acid and 65-90 parts of solvent.
2. Sandstone retarder acid according to claim 1, wherein the amino acid chelating agent is selected from amino acids and/or amino acid polymers.
3. Sandstone retarder acid according to claim 1 or 2, wherein the amino acid is selected from one or more of the group consisting of aspartic acid, lysine and glutamic acid; the amino acid polymer is selected from one or more of the group consisting of polyaspartic acid, polylysine and polyglutamic acid;
Preferably, the number average molecular weight of the amino acid polymer is 1.3 to 130 tens of thousands, or the polymerization degree of the amino acid polymer is 100 to 10000; the number average molecular weight of the amino acid polymer is more preferably 1.3 to 13 tens of thousands, or the polymerization degree of the amino acid polymer is more preferably 100 to 1000.
4. A sandstone retarder acid according to any of claims 1 to 3, wherein the weight ratio of the amino acid chelating agent to the hydroxycarboxylic acid chelating agent is (7-10): 5-8.
5. The sandstone retarder of claim 4, wherein said hydroxycarboxylic acid chelating agent is selected from one or more of the group consisting of sodium gluconate, sodium citrate and sodium maleate;
preferably, the hydroxycarboxylic acid chelating agent is selected from sodium gluconate;
More preferably, when the amino acid chelating agent is selected from polyaspartic acid, the hydroxycarboxylic acid chelating agent is selected from sodium gluconate, and the weight ratio of polyaspartic acid to sodium gluconate is (7-9): 7-8.
6. Sandstone retarder acid according to claim 1, wherein the mineral acid is selected from hydrofluoric acid, or a mixture of hydrochloric acid and hydrofluoric acid; preferably, the inorganic acid comprises a mixture of hydrochloric acid and hydrofluoric acid, and the weight ratio of the hydrochloric acid to the hydrofluoric acid is (1-5): 1-3.
7. The sandstone retarder of claim 6, wherein the sandstone retarder further comprises, in parts by weight: 0.5-1 part of corrosion inhibitor;
preferably, the corrosion inhibitor is selected from Mannich bases and/or quinoline quaternary ammonium compounds.
8. Sandstone retarder according to claim 7, wherein the solvent is selected from one or more of the group consisting of water, 1-5% methanol by weight.
9. The sandstone retarder of claim 8, wherein the sandstone retarder comprises, in parts by weight: 7-9 parts of the amino acid chelating agent, 7-8 parts of the hydroxycarboxylic acid chelating agent, 3-5 parts of the hydrochloric acid, 2-3 parts of the hydrofluoric acid, 0.5-1 part of the corrosion inhibitor and 74-80.5 parts of the solvent.
10. Use of sandstone retarder of any of claims 1 to 9 in the field of oil and gas field development technology.
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