High temperature resistance water swelling body with high degree of mineralization, preparation method and application thereof

A technology with high salinity and high temperature resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of dehydration and hardening, and cannot meet the requirements of plugging strength and stability, so as to increase water absorption capacity, Good elasticity, good strength and elastic effect

Active Publication Date: 2018-10-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the defect that the existing jelly system cannot meet the requirements for plugging strength and stability at high temperature and high salinity during oilfield development, and the existing water swelling system cannot meet the conditions of high temperature and high salinity formations resulting in insufficient dehydration and hardening

Method used

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  • High temperature resistance water swelling body with high degree of mineralization, preparation method and application thereof
  • High temperature resistance water swelling body with high degree of mineralization, preparation method and application thereof
  • High temperature resistance water swelling body with high degree of mineralization, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In 37.5g clay mother liquor, add 30g monomer (molar ratio N,N-dimethylacrylamide and sodium p-vinylbenzenesulfonate=4:6), 5.31g MBA solution, 4g azobisisobutylamidine hydrochloride After salt, 6g sodium persulfate solution, stir evenly, then add salinity to the mixed solution and be the sodium chloride aqueous solution of 1000mg / L to make up 100g of solution. The above-mentioned obtained solution is mixed uniformly, placed in a jar, placed in a water bath at 50° C. and heated over water to obtain the water-swollen body of the present invention.

[0035] The gelling time of the water-swellable body obtained in this example is 4 hours, placed at 130°C, and the degree of salinity is 22×10 4 mg / L Tahe water aged for 117 days without carbonization, and still has good strength and elasticity, and the final water absorption multiple of about 117 days is 1.97.

Embodiment 2

[0037] In 37.5g clay mother liquor, add 30g monomer (molar ratio N,N-dimethylacrylamide and sodium p-vinylbenzenesulfonate=5:5), 5.31g MBA solution, 4g azobisisobutylamidine hydrochloride After salt, 6g sodium persulfate solution, stir evenly, then add salinity to the mixed solution and be the sodium chloride aqueous solution of 1000mg / L to make up 100g of solution. The above-mentioned obtained solution is mixed uniformly, placed in a jar, placed in a water bath at 50° C. and heated over water to obtain the water-swollen body of the present invention.

[0038] The gelling time of the water-swellable body obtained in this example is 4.5h, placed at 130°C, and the degree of salinity is 22×10 4 mg / L Tahe water aged for 117 days without carbonization, and still has good strength and elasticity, and the final water absorption multiple of about 117 days is 2.49.

Embodiment 3

[0040] In 37.5g clay mother liquor, add 30g monomer (molar ratio N,N-dimethylacrylamide and sodium p-vinylbenzenesulfonate=6:4), 5.31g MBA solution, 4g azobisisobutylamidine hydrochloride After saline solution, 6g sodium persulfate solution, stir evenly, then add the sodium chloride aqueous solution that salinity is 1000mg / L to the mixed solution and make up 100g of solution. The above-mentioned obtained solution is mixed uniformly, placed in a jar, placed in a water bath at 50° C. and heated over water to obtain the water-swollen body of the present invention.

[0041] The gelling time of the water-swelling body obtained in this example is 6 hours, placed at 130° C., and the degree of salinity is 22×10 4 mg / L Tahe water aged for 117 days without carbonization, and still has good strength and elasticity, and the final water absorption multiple of about 117 days is 3.32.

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Abstract

The invention relates to a high temperature resistance water swelling body with high degree of mineralization, a preparation method and application thereof. The water swelling body comprises the following components in percent by mass: 20 to 30 percent of a main agent, 0.04 to 0.08 percent of a cross-linking agent, 3 percent of a filler, 0.06 to 0.14 percent of an initiator, and water for the surplus, wherein the sum of the mass percent of all the components is 100 percent. The main agent is formed by compounding N, N-dimethylacrylamide and p-vinyl sodium benzenesulfonate according to a certain ratio; the cross-linking agent adopts N, N-methylene bisacrylamide; the filler adopts clay / silica sol; the initiator is formed by compounding sodium persulfate and 2, 2'-azobis (2-methylpropionamide) dihydrochloride according to a mole ratio being 1:1. The water swelling body is formed by performing polymerization reaction in 50 DEG C, is excellent in temperature resistance, and can achieve effective blocking effect on large-pore reservoirs in severe conditions that the temperature is 130 DEG C and the degree of mineralization is 22*104mg / L.

Description

Technical field: [0001] The invention relates to a high-temperature-resistant high-salinity water-swelling body, which belongs to the technical field of oil field chemistry. Background technique: [0002] Due to the presence of micro-fractures and large pores in some reservoirs, serious water channeling occurs in the process of water flooding and polymer flooding, which leads to a low sweep coefficient in the process of oil flooding, which in turn reduces the recovery factor. Many oil wells have very low production value in the later stage of production. In response to this phenomenon, profile control technology is usually used to block large pores and micro-fractures, so that the displacement medium can enter the small pores that cannot enter before, and increase the area affected by the oil washing agent, thereby reducing the remaining oil saturation in the reservoir. Get more economic benefits. The conventionally used water-swelling plugging agent is generally formed by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F212/14C08F2/44C08K3/34C08K3/36C09K8/512
CPCC08F2/44C08F212/14C08F220/54C08K3/346C08K3/36C09K8/5083C09K8/512
Inventor 葛际江宋龙飞张雯张宇豪吴千慧孙翔宇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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