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CN-121759177-B - Clay stabilizer and preparation method thereof

CN121759177BCN 121759177 BCN121759177 BCN 121759177BCN-121759177-B

Abstract

The invention belongs to the technical field of clay stabilizer preparation, and particularly relates to a clay stabilizer and a preparation method thereof. The clay stabilizer consists of 1-ethyl-3-vinyl imidazolium bromide, [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium methyl sulfate salt, 3- { (dimethyl (3-trimethoxy silicon based) propyl) ammonium } propane-1-sulfonate, polyallylamine hydrochloride, glycerophosphorylcholine, laurinol polyoxyethylene polyoxypropylene ether, glacial acetic acid and the balance of deionized water. The clay stabilizer disclosed by the invention has excellent permeability and anti-swelling rate due to the synergistic effect of the raw materials.

Inventors

  • SONG XIAOLONG
  • Men Guangtao
  • ZHAI SITONG
  • WEI MAOWEI
  • WANG YISHUN
  • ZHANG SHUN

Assignees

  • 胜利方圆实业集团有限公司综合福利厂

Dates

Publication Date
20260508
Application Date
20260302

Claims (7)

  1. 1. A clay stabilizer is characterized by comprising, by mass, 14-16% of 1-ethyl-3-vinyl imidazolium bromide, 23-25% of [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium sulfate, 11-13% of 3- { (dimethyl (3-trimethoxysilyl) propyl) ammonium } propane-1-sulfonate, 7-9% of polyacrylamide hydrochloride, 7-9% of glycerophosphorylcholine, 9-11% of laurinol polyoxyethylene polyoxypropylene ether, 0.15-0.17% of glacial acetic acid and the balance of deionized water.
  2. 2. The clay stabilizer according to claim 1, wherein the weight average molecular weight of the polyacrylamide hydrochloride is 15000.
  3. 3. A method for preparing a clay stabilizer according to claim 1, wherein the method comprises the following steps: (1) Adding deionized water into a reaction container, heating to 40-45 ℃ under stirring, adding glacial acetic acid, adding polyacrylamide hydrochloride, stirring for dissolving, adding [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium methyl sulfate, stirring for dissolving, cooling to 25-30 ℃, adding 1-ethyl-3-vinyl imidazolium bromide, glycerophosphorylcholine and laurinol polyoxyethylene polyoxypropylene ether, and stirring uniformly; (2) Adding 3- { (dimethyl (3-trimethoxy silicon based) propyl) ammonium } propane-1-sulfonate into the mixed system prepared in the step (1), and stirring uniformly; (3) Shearing the system prepared in the step (2) to prepare the clay stabilizer.
  4. 4. The method of claim 3, wherein the stirring speed in the step (1) is 250r/min.
  5. 5. The method for preparing clay stabilizer according to claim 3, wherein in the step (1), polyacrylamide hydrochloride is added, stirred and dissolved for 20-25min, methyl [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium sulfate is added, stirred and dissolved for 15-20min, 1-ethyl-3-vinyl imidazolium bromide is added, stirred for 6-8min after the temperature is reduced to 25-30 ℃, glycerophosphorylcholine is added, stirred for 6-8min, and finally laurinol polyoxyethylene polyoxypropylene ether is added, and stirred for 6-8min.
  6. 6. The method for preparing a clay stabilizer according to claim 3, wherein 3- { (dimethyl (3-trimethoxysilyl) propyl) ammonium } propane-1-sulfonate is added in step (2) and stirred for 13-15 minutes, wherein the stirring temperature is 20-25 ℃, and the stirring speed is 250r/min.
  7. 7. The method of producing a clay stabilizer according to claim 3, wherein the rotational speed of shearing in the step (3) is 1000r/min, the shearing time is 10 to 12min, and the shearing temperature is 30 to 35 ℃.

Description

Clay stabilizer and preparation method thereof Technical Field The invention belongs to the technical field of clay stabilizer preparation, and particularly relates to a clay stabilizer and a preparation method thereof. Background Oil and gas field reservoirs all contain a certain amount of clay minerals (e.g. kaolin, montmorillonite, illite, chlorite, illite) which swell and migrate during water-based fracturing modification of the reservoir. During expansion, the clay absorbs water into the crystal structure, causing an increase in the volume of the clay, thereby blocking the pores of the formation, and during migration, clay material is dispersed by extraneous liquid or carried by the produced fluid, forming a bridge or choke point at the pore throat of the capillary, which then causes a decrease in the permeability of the formation. In order to reduce the hydration swelling of clay minerals, clay stabilizers must be added. With development of oil fields, clay stabilizers are widely applied, and are mainly classified into four categories according to different chemical compositions, namely, a first category is inorganic salt and inorganic alkali, the stabilizers have the advantages of low price, simple use method and short anti-swelling effective period and poor effect on inhibiting particle migration, a second category is inorganic polymer, the stabilizers have the advantages of low price and longer effective period than common inorganic salt, are still unsuitable for carbonate strata and are only used under weak acid conditions, so that the application range of the stabilizers is greatly limited, a third category is cationic surfactants, the stabilizers have the advantages of strong adsorption effect and water flushing resistance, but still have the defects of converting the strata into lipophilicity and reducing the permeability of oil gas phase, and a fourth category is organic cationic polymers, the stabilizers have the advantages of wide use range, good stabilizing effect, long effective time, strong acid, alkali, oil and water flushing resistance, but poor high-temperature flushing resistance and high-temperature resistance. All the four clay stabilizers are based on a physical adsorption mechanism, do not form chemical bonds with the clay surface, and are easy to analyze under the condition of long-term flushing of formation water or high temperature. The patent CN 106147739A discloses a clay stabilizer for fracturing, which comprises, by weight, 35-50 parts of choline chloride, 3-8 parts of calcium chloride, 40-50 parts of water, 5-10 parts of methanol and l-5 parts of alcohol ether solvents. The choline chloride is a small molecular quaternary ammonium salt, and forms weak electrostatic adsorption with clay, and has no long-chain hydrophobic barrier and chemical crosslinking. In view of the foregoing, it is necessary to explore a novel clay stabilizer. Disclosure of Invention The invention aims to provide a clay stabilizer which has excellent anti-swelling rate, and also provides a preparation method thereof. The clay stabilizer consists of the following raw materials, by mass, 14-16% of 1-ethyl-3-vinyl imidazolium bromide, 23-25% of [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium sulfate, 11-13% of 3- { (dimethyl (3-trimethoxysilyl) propyl) ammonium } propane-1-sulfonate, 7-9% of polyacrylamide hydrochloride, 7-9% of glycerophosphorylcholine, 9-11% of laurinol polyoxyethylene polyoxypropylene ether, 0.15-0.17% of glacial acetic acid and the balance of deionized water. Wherein the CAS number of the [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium methyl sulfate salt is 18602-17-0. 3- { (Dimethyl (3-trimethoxysilyl) propyl) ammonio } propane-1-sulfonate has a CAS number of 151778-80-2. The weight average molecular weight of the polyacrylamide hydrochloride was 15000. The preparation method of the clay stabilizer provided by the invention comprises the following steps: (1) Adding deionized water into a reaction container, heating to 40-45 ℃ under stirring, adding glacial acetic acid, adding polyacrylamide hydrochloride, stirring for dissolving, adding [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium methyl sulfate, stirring for dissolving, cooling to 25-30 ℃, adding 1-ethyl-3-vinyl imidazolium bromide, glycerophosphorylcholine and laurinol polyoxyethylene polyoxypropylene ether, and stirring uniformly; (2) Adding 3- { (dimethyl (3-trimethoxy silicon based) propyl) ammonium } propane-1-sulfonate into the mixed system prepared in the step (1), and stirring uniformly; (3) Shearing the system prepared in the step (2) to prepare the clay stabilizer. Wherein the stirring rotating speed in the step (1) is 250r/min. Adding polyacrylamide hydrochloride into the step (1), stirring and dissolving for 20-25min, adding [3- (dodecyloxy) -2-hydroxypropyl ] di (2-hydroxyethyl) methyl ammonium methyl sulfate, stirring and dissolving for 15-20mi