Polymer gel particle for profile control and water plugging of deep parts as well as preparation method thereof

A technology of gel particles and deep profile control, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve the problems of slow expansion and low plugging strength

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that in the prior art, the profile control and water shutoff agent expands rapidly in the early stage, expands slowly in the later stage, and has low plugging strength in large pores. A polymer for deep profile control and water shutoff is provided. Gel particles, by introducing cellulose to form a double interpenetrating network in the polyacrylamide gel, to ensure the strength of the polymer gel particles at the initial stage of expansion, and at the same time to achieve post-swelling of the gel particles through the degradation of cellulose in water accelerated effect

Method used

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  • Polymer gel particle for profile control and water plugging of deep parts as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First add 650g of deionized water to the polymerization kettle, add 100g of acrylamide, 10g of methacrylamide, 1.5g of hydroxymethyl cellulose, 0.001g of N,N'-methylenebisacrylamide, stir until completely dissolved, and use Adjust the pH value to 9 with NaOH, and start to pass high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 15°C, and then the free radical polymerization composite initiator system was added, and the nitrogen gas was continued to flow for 30 minutes before sealing. After 1 hour, the reaction temperature was gradually raised to 45°C. After 3 hours of reaction, a water-containing gel-like polymer product was obtained. After cutting the glue, it was blown and dried at 90°C for 1.5 hours, crushed with a pulverizer, and sieved out from microns to millimeters. grade particles to obtain polymer gel particles for deep profile control and water plugging.

[0037] The sample obtained in Example 1 was dispersed in cyclohexane...

Embodiment 2

[0040] First add 650g deionized water to the polymerization kettle, add 100g acrylamide, 60g acrylic acid, 3g hydroxyethyl cellulose, 0.01g polyethylene glycol diacrylate, stir until completely dissolved, adjust the pH value to 9 with NaOH, and Start to pass high-purity nitrogen gas, and after 30 minutes, lower the temperature in the kettle to 15°C, then add a free radical polymerization composite initiator system, continue to pass nitrogen gas for 30 minutes, and then seal it. After 1 hour, the reaction temperature was gradually raised to 45°C. After 3 hours of reaction, a water-containing gel-like polymer product was obtained. After cutting the glue, it was blown and dried at 90°C for 1.5 hours, crushed with a pulverizer, and sieved out from microns to millimeters. grade particles to obtain polymer gel particles for deep profile control and water plugging.

[0041]The sample obtained in Example 2 was dispersed in cyclohexane, stirred for 1 hour, and its particle size was mea...

Embodiment 3

[0044] First add 650g of deionized water to the polymerization kettle, add 100g of acrylamide, 40g of methacryloyloxyethyl trimethylammonium chloride, 6g of hydroxymethyl cellulose, 0.1g of N,N'-m-phenylene bisma Stir the imide until it is completely dissolved, adjust the pH value to 9 with NaOH, and start feeding high-purity nitrogen gas. After 30 minutes, lower the temperature in the kettle to 15°C, then add the free radical polymerization composite initiator system, and continue nitrogen gas flow Seal after 30 minutes. After 1 hour, the reaction temperature was gradually raised to 45°C. After 3 hours of reaction, a water-containing gel-like polymer product was obtained. After cutting the glue, it was blown and dried at 90°C for 1.5 hours, crushed with a pulverizer, and sieved out from microns to millimeters. grade particles to obtain polymer gel particles for deep profile control and water plugging.

[0045] The sample obtained in Example 3 was dispersed in cyclohexane, st...

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Abstract

The invention relates to a polymer gel particle for profile control and water plugging of deep parts as well as a preparation method thereof. The particle mainly solves the problems of rapid expansion in the early stage and slow expansion in the later stage, low plugging strength in large channels and the like of profile control and water plugging agents in the prior art. The polymer gel particle for profile control and water plugging of deep parts is used, and is prepared by polymerization of a mixture shown in the following in parts by mass: (1) 100 parts of acrylamide; (2) 0-60 parts of a comonomer; (3) 0.1-15 parts of modified cellulose; (4) 0.001-0.5 parts of a cross-linking agent; (5) 200-2000 parts of water. The technical scheme can better solve the problem, and can be applied to traditional profile control and water plugging technology in the prior art.

Description

technical field [0001] The invention relates to a polymer gel particle for deep profile control and water plugging and a preparation method thereof, in particular to a cellulose composite polymer gel particle with a size from micron to millimeter, which can be used as deep profile control and plugging in tertiary oil recovery Aqueous use. Background technique [0002] Petroleum is known as the "blood of industry" and is one of the most important energy sources of modern industry. However, my country's dependence on foreign oil remains high, which is very detrimental to the country's long-term energy strategic security. my country's oilfields are mainly continental sedimentary oilfields with serious heterogeneity. In addition, all major oilfields have entered the stage of tertiary oil recovery. A large amount of water injection in the early stage of oil recovery has led to high water content in the reservoir and serious heterogeneity. Cause the injection fluid to escape from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/54C08F222/38C08F220/06C08F220/34C08F222/40C08F226/02C08F222/20C08J3/075C08L33/26C08L1/28C09K8/512
Inventor 蔡红夏燕敏苏智青宋晓芳王兰
Owner CHINA PETROLEUM & CHEM CORP
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