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CN-121975505-A - Blocking remover for powder and preparation method thereof

CN121975505ACN 121975505 ACN121975505 ACN 121975505ACN-121975505-A

Abstract

The invention discloses a blocking remover for powder and a preparation method thereof, wherein the blocking remover is prepared from tetrazole quaternary ammonium acetate, carboxylate-sulfonate-acrylate terpolymer, organic alcohol solvent, surfactant, clay stabilizer, pH regulator, synergist and water through mixing and stirring, wherein the cationic part of the tetrazole quaternary ammonium acetate contains C 4 ～C 8 alkyl hydrophobic chain, the hydrophobic chain is convenient for penetrating powder blocking objects wrapped by an oil film, the blocking removing efficiency is better improved, and the tetrazole quaternary ammonium acetate is in the carboxylate-sulfonate-acrylate terpolymer comb-shaped structure, and the side chain contains 2-4 ethylene oxide units, so that electrostatic adsorption and Van der Waals force between the powder can be better destroyed, a space hydration layer can be formed, the powder secondary aggregation is prevented, and the dispersing efficiency is improved.

Inventors

  • LIN XINGYU

Assignees

  • 陕西庆华石油建设有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. The blocking remover for the powder is characterized by comprising, by weight, 10-15 parts of tetrazole acetic acid quaternary ammonium salt, 2-3 parts of a terpolymer, 5-8 parts of an organic alcohol solvent, 0.5-1 part of a surfactant, 0.5-1 part of a clay stabilizer, 2-3 parts of a pH regulator, 0.3-0.5 part of a synergist and 70-80 parts of water.
  2. 2. The blocking remover for powder as set forth in claim 1, wherein the cationic moiety of the quaternary ammonium tetrazolylacetate contains a C 4 ～C 8 alkyl hydrophobic chain.
  3. 3. The blocking remover for powder as claimed in claim 1, wherein the terpolymer is a carboxylate-sulfonate-acrylate terpolymer in a comb structure, and the side chain contains 2-4 ethylene oxide units.
  4. 4. The blocking remover for powder as claimed in claim 1, wherein the quaternary ammonium tetrazoleacetate is prepared by the following steps: S1, synthesizing alkylated tetrazole, namely dissolving 1H-tetrazole and bromoalkane (C 4 ～C 8 ) in acetonitrile according to a molar ratio of 1:1.1-1.2, adding potassium carbonate (1.5 times of molar weight), carrying out reflux reaction for 8 hours at 65-75 ℃, filtering to remove salt, and concentrating to obtain the alkyl tetrazole (the yield is more than or equal to 90 percent); s2, quaternization-hydrolysis reaction, namely mixing the alkyl tetrazole prepared in the step S1 with vinyl chloroacetate according to a molar ratio of 1:1.05, and reacting for 4 hours at 50 ℃ under the protection of nitrogen to generate a quaternary ammonium salt intermediate; s3, adding 10% NaOH solution, hydrolyzing ester groups, preserving heat for 2 hours at 60 ℃, adjusting pH to 6.5-7.0, and crystallizing to obtain a target product.
  5. 5. The blocking remover for powder as claimed in claim 1, wherein the synergist is thiourea derivative.
  6. 6. The blocking remover for powder as claimed in claim 1, wherein the synergist is prepared by the following steps: S1, synthesizing bis (thiourea) ethane, namely dissolving thiourea and dibromoethane in an ethanol-water mixed solvent (volume ratio is 1:1) according to a molar ratio of 2.05-2.1:1, adding NaOH to adjust pH to 9-10, and carrying out reflux reaction for 4 hours at 65-70 ℃, cooling, carrying out suction filtration, and washing precipitate with glacial ethanol to obtain white crystal bis (thiourea) ethane; S2, preparing an aluminum citrate solution, namely dissolving citric acid and aluminum sulfate in water at 60 ℃ according to a molar ratio of 3:1, and regulating the pH value to 4.0+/-0.2 by using ammonia water to generate a transparent aluminum citrate complex solution; And S3, coupling the synergist, namely mixing the bis-thioureido ethane obtained in the step S1 with the aluminum citrate solution in the step II according to the molar ratio of thioureido to Al 3+ =3:1, reacting for 30 minutes at 50 ℃ under the assistance of ultrasonic waves, and spray drying to obtain the synergist powder.
  7. 7. The blocking remover for powder as claimed in claim 1, wherein the organic alcohol solvent is ethylene glycol monobutyl ether or diethylene glycol monomethyl ether.
  8. 8. The blocking remover for powder as claimed in claim 1, wherein the carboxylate-sulfonate-acrylate terpolymer has a molecular weight of 8000-15000 Da and a sulfonic acid group content of 15-25%.
  9. 9. The blocking remover for powder as claimed in claim 1, wherein the clay stabilizer is epichlorohydrin-dimethylamine copolymer with a molecular weight of 3000-5000 Da.
  10. 10. The preparation method of the blocking remover for the powder is characterized by comprising the following steps of: s1, synthesizing tetrazole acetic acid quaternary ammonium salt; s2, synthesizing a synergistic agent; And S3, preparing a blocking remover, namely heating water to 40-50 ℃, sequentially adding an organic alcohol solvent, quaternary ammonium tetrazole acetate, a terpolymer and water, stirring for 20 minutes at 800-1200 r/min, and then stirring for 2 hours at 800-1200 r/min to obtain the blocking remover.

Description

Blocking remover for powder and preparation method thereof Technical Field The invention relates to the technical field of preparation of blocking remover, in particular to a blocking remover for powder and a preparation method thereof. Background In the petroleum exploitation and transportation process, the blockage of the pipeline can greatly slow down the whole oil extraction speed, affect the speed and increase the cost of oil extraction, and the scaling of calcium carbonate (CaCO 3) and barium sulfate (BaSO 4) is a core problem of causing the blockage of near-wellbore zones, downhole tools and oil pipelines. Such scale layers are mainly derived from: 1. Formation water is not ion-compatible with injected water (e.g., ca 2+ binds CO 32-/SO42-); 2. inorganic salt precipitation is caused by temperature and pressure changes (the solubility of calcium carbonate is reduced along with the temperature rise, and the sulfuric acid is easy to form anhydrite at the temperature of more than 80 ℃); 3. And (3) secondary scaling after CO 2 oil displacement or acidification and plugging removal. The hard calcium scale can block the oil gas seepage channel, so that the yield is suddenly reduced by 20-50%, and even the pipe column is blocked, so that the well repairing cost is increased. Aiming at the problems, a blocking remover for powder and a preparation method thereof are provided. Disclosure of Invention (1) Technical problem to be solved The invention aims to provide a blocking remover for powder and a preparation method thereof, which solve the technical problems of poor blocking removing effect of the existing blocking remover on petroleum pipelines and the like. (2) Technical proposal The blocking remover for the powder comprises, by weight, 10-15 parts of tetrazole quaternary ammonium acetate, 2-3 parts of a terpolymer, 5-8 parts of an organic alcohol solvent, 0.5-1 part of a surfactant, 0.5-1 part of a clay stabilizer, 2-3 parts of a pH regulator, 0.3-0.5 part of a synergist and 70-80 parts of water. Further, the terpolymer is a carboxylate-sulfonate-acrylate terpolymer with a comb-shaped structure, and the side chain of the terpolymer contains 2-4 ethylene oxide units. Further, the tetrazolium acetic acid quaternary ammonium salt is prepared by the following steps: S1, synthesizing alkylated tetrazole: dissolving 1H-tetrazole and bromoalkane (C 4～C8) in acetonitrile according to a molar ratio of 1:1.1-1.2, adding potassium carbonate (the molar weight is 1.5 times), carrying out reflux reaction for 8 hours at 65-75 ℃, filtering to remove salt, and concentrating to obtain the alkyl tetrazole (the yield is more than or equal to 90%). S2, quaternization-hydrolysis reaction: Mixing the alkyl tetrazole prepared in the step S1 with vinyl chloroacetate according to a molar ratio of 1:1.05, and reacting for 4 hours at 50 ℃ under the protection of nitrogen to generate a quaternary ammonium salt intermediate; And S3, adding 10% NaOH solution, hydrolyzing ester groups, preserving heat for 2 hours at 60 ℃, adjusting the pH value to 6.5-7.0, and crystallizing to obtain a target product. Further, the synergist is thiourea derivative. Further, the synergist is prepared by the following steps: S1, synthesis of bis (thioureido) ethane: dissolving thiourea and dibromoethane in an ethanol-water mixed solvent (volume ratio is 1:1) according to a molar ratio of 2.05-2.1:1, adding NaOH to adjust pH to 9-10, and carrying out reflux reaction for 4 hours at 65-70 ℃; Cooling, filtering, washing the precipitate with ice-ethanol to obtain white crystal bis-thioureido ethane. S2, preparing an aluminum citrate solution: Dissolving citric acid and aluminum sulfate in water at a temperature of 60 ℃ according to a molar ratio of 3:1, and regulating the pH value to 4.0+/-0.2 by using ammonia water to generate a transparent aluminum citrate complex solution; S3, coupling a synergistic agent: The bis-thiourea ethane obtained in the step S1 is mixed with the aluminum citrate solution in the step S1 according to the molar ratio of thiourea group to Al 3+ =3:1, and reacts for 30 minutes at 50 ℃ under the assistance of ultrasonic waves (40 kHz), and the synergist powder is obtained through spray drying. Further, the organic alcohol solvent is ethylene glycol monobutyl ether or diethylene glycol monomethyl ether, and is used for improving low-temperature permeability. Further, the molecular weight of the carboxylate-sulfonate-acrylate terpolymer is 8000-15000 Da, and the sulfonic acid group accounts for 15-25%. Further, the clay stabilizer is an epichlorohydrin-dimethylamine copolymer with a molecular weight of 3000-5000 Da. Further, the preparation method of the blocking remover for powder comprises the following steps: s1, synthesizing tetrazole acetic acid quaternary ammonium salt; s2, synthesizing a synergistic agent; s3, preparing a blocking remover: Heating water to 40-50 ℃, sequentially adding an organic alcohol solvent, tetrazole acetic acid