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A polymer for high temperature resistant acid fracturing and its preparation method

An acid fracturing and polymer technology, applied in the field of drilling, which can solve the problems of slow water solubility and acid solubility, uncontrolled cross-linked acid, high viscosity, and inability to meet the requirements.

Active Publication Date: 2020-11-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The cross-linked acid formed by the action of the existing acid thickener and cross-linking agent can basically meet the needs of acid fracturing technology within 150°C. The viscosity of the acid gradually decreases, and the cross-linked acid loses the ability to control the higher viscosity, sometimes even has no viscosity, and cannot play a good retarding effect, showing the characteristics of poor temperature resistance and acid resistance, and there are water-soluble and acid-soluble speeds. Phenomena such as slowness, unable to meet the requirements of acid fracturing construction at temperatures above 160°C in the Shunnan block in Northwest my country

Method used

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  • A polymer for high temperature resistant acid fracturing and its preparation method
  • A polymer for high temperature resistant acid fracturing and its preparation method
  • A polymer for high temperature resistant acid fracturing and its preparation method

Examples

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Effect test

Embodiment 1

[0036] 20g of acrylamide, 4g of methacrylamide, 5g of 75% solution of methacryloyloxyethyltrimethylammonium chloride, 28g of temperature-resistant and salt-resistant monomer (2-methacryloyloxybutylsulfonic acid) Stirring at 300r / min, add 160ml of water into the reactor placed in a constant temperature water bath, stir well, add 0.05g of molecular weight modifier polyoxyethylene diacrylate, adjust the polymerization system with 20% sodium hydroxide aqueous solution The pH value is 7. Stir for about 30 minutes by blowing nitrogen to deoxygenate, raise the temperature of the polymerization solution to 45°C, then add 0.06 g of potassium persulfate and sodium sulfite respectively to initiate polymerization, and continue to keep blowing nitrogen for about 20 minutes; polymerize at a constant temperature in a constant temperature water bath After 8 hours, take out and shear granulate, dry and pulverize to obtain the polymer for high temperature resistant acidification fracturing.

Embodiment 2

[0038] 30g of acrylamide, 6g of methacrylamide, 8g of acryloyloxyethyltrimethylammonium chloride 75% solution, 20g of temperature-resistant and salt-resistant monomer (2-acryloyloxybutylsulfonic acid) at 300r / min Add 175ml of water successively to a reactor placed in a constant temperature water bath under stirring at a rotating speed. After stirring evenly, add 0.035g of molecular weight regulator ethylene glycol diacrylate, and adjust the pH of the polymerization system to 8 with 20% potassium hydroxide aqueous solution. , and stirred for about 25 minutes by blowing nitrogen to deoxygenate, raising the temperature of the polymerization solution to 35°C, then adding 0.12 g of potassium persulfate and sodium sulfite respectively to initiate polymerization, and continuing to keep blowing nitrogen for about 25 minutes; Cutting and granulating, drying and pulverizing to obtain the high-temperature-resistant polymer for acidification and fracturing.

Embodiment 3

[0040] 13g of acrylamide, 8g of methacrylamide, 8g of dimethyl diallyl ammonium chloride 70% solution, 32g of temperature-resistant and salt-resistant monomer (2-acryloyloxy isopentenyl sulfonic acid) at 300r / Add 180ml of water successively to the reactor placed in a constant temperature water bath under stirring at min speed, stir evenly, add 0.28g of molecular weight regulator butanediol diacrylate, adjust the pH of the polymerization system with 20% sodium hydroxide aqueous solution 9. Stir for about 30 minutes with nitrogen gas to deoxygenate, raise the temperature of the polymerization solution to 50°C, then add 0.23 g each of potassium persulfate and sodium sulfite to initiate polymerization, and continue to maintain nitrogen gas for about 20 minutes; keep the constant temperature polymerization reaction in a constant temperature water bath for 10 hours, take out Shear granulation, drying, crushing to obtain high temperature resistant polymer for acidification fracturing...

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Abstract

The invention discloses a high-temperature-resistant polymer for acidizing fracturing and a preparation method of the polymer. The polymer is prepared by polymerizing raw materials comprising the following components: acrylamide, methacrylamide, a cationic monomer, a temperature-resistant salt-resistant monomer, a molecular weight regulator, an initiator and water; wherein the total mass of all components except water is taken as 100%, the mass percent of the components are as follows: 20%-65% of the acrylamide, 5%-15% of the methacrylamide, 5-18% of the cationic monomer, 15%-55% of the temperature-resistant and salt-resistant monomer, 0.01%-0.5% of the molecular weight regulator, and 0.1-0.5% of the initiator, and the total mass concentration of all components except water is 20-35%. Thepolymer disclosed by the invention has good water solubility, acid solubility, instant dissolution, temperature resistance, shearing resistance and excellent thickening effect, and can be applied to the fields of acidizing fracturing construction, reinforced oil production operation and the like in oil exploitation at a temperature of 160 DEG C or above.

Description

technical field [0001] The invention relates to the field of well drilling, in particular to a high-temperature-resistant polymer for acidification fracturing and a preparation method thereof. Background technique [0002] Acid fracturing technology is one of the main measures for increasing production of oil and gas wells and increasing injection of water injection wells. In order to remove blockage near the wellbore of oil and gas wells in carbonate reservoirs and sandstone reservoirs, expand or extend oil and gas flow channels, restore or increase formation permeability, and increase productivity, it is often used to inject oil into the formation under conditions lower than the fracture pressure of the reservoir. Inject acid. Acid fracturing is to press open the formation with a large displacement to form long fractures under the condition of higher than the fracture pressure of the reservoir or the fracture extension pressure, or expand the natural fractures in the bott...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/38C08F220/56C08F220/34C08F226/02C08F220/40C08F2/38C09K8/588C09K8/74
CPCC08F2/38C08F220/38C08F220/382C08F220/40C08F220/56C09K8/588C09K8/74C08F226/02C08F220/34
Inventor 杨小华曾义金林永学董晓强姚奕明王琳杨帆
Owner CHINA PETROLEUM & CHEM CORP
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