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Gel plugging agent as well as preparation method and application thereof

A technology of plugging agent and jelly, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor injection performance, increased injection pressure, high viscosity of gelling liquid, etc., to achieve improved injection performance, Effects of lower injection pressure and lower viscosity

Inactive Publication Date: 2020-08-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the molecular weight of polymers used in traditional jelly plugging agents is generally 1000×10 4 Above, due to the high viscosity of the gelling liquid, the injection pressure of the gel system will increase after injection into the low-permeability reservoir, and the injection performance will deteriorate, and even block the formation in severe cases.

Method used

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  • Gel plugging agent as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First weigh 0.5g of 200×10 4 Partially hydrolyzed polyacrylamide particles with molecular weight were added with 19.5 g of tap water to prepare 20 g of partially hydrolyzed polyacrylamide mother liquor with a mass fraction of 2.5%. Add 20g of the above-mentioned partially hydrolyzed polyacrylamide mother liquor, 0.5g of chromium acetate, 0.01g of malonic acid, 0.2g of nano-silica sol into the beaker, add 79.29g of tap water to make up the mixed solution to 100g, stir well and evenly to obtain gel liquid, the viscosity of the gelling liquid is 23.62mPa·s, and the gelling time is 48h at 40°C, and the jelly blocking agent of the present invention is obtained, and the gelling strength of the blocking agent is 15.1Pa.

Embodiment 2

[0025] First weigh 0.6g of 200×10 4 Partially hydrolyzed polyacrylamide particles with molecular weight were added with 23.4 g of tap water to prepare 24 g of partially hydrolyzed polyacrylamide mother liquor with a mass fraction of 2.5%. Add 24g of the above-mentioned partially hydrolyzed polyacrylamide mother liquor, 0.3g of chromium acetate, 0.01g of malonic acid, 0.2g of nano-silica sol, and add 75.49g of tap water to make up the mixed solution to 100g. The glue, the viscosity of the glue to be formed is 35.8mPa·s, the gelling time is 48h at 40°C, and the gelling strength of the plugging agent is 16.3Pa.

Embodiment 3

[0027] First weigh 0.7g of 200×10 4 Partially hydrolyzed polyacrylamide particles with molecular weight were added with 27.3 g of tap water to prepare 28 g of partially hydrolyzed polyacrylamide mother liquor with a mass fraction of 2.5%. Add 28g of the above-mentioned partially hydrolyzed polyacrylamide mother liquor, 0.4g of chromium acetate, 0.02g of malonic acid, 0.2g of nano-silica sol into a beaker, add 71.38g of tap water to make up the mixed solution to 100g, and stir well to obtain the finished product. Glue, the viscosity of the glue to be formed is 48.9mPa·s, the gelling time is 36h at 40°C, and the gelling strength of the plugging agent is 18.5Pa.

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Abstract

The invention discloses a gel plugging agent as well as a preparation method and application thereof. The invention belongs to the technical field of oilfield chemistry. The gel plugging agent comprises the following components in percentage by mass: 0.5%-0.7% of partially hydrolyzed polyacrylamide, 0.3%-0.5% of chromium acetate, 0.01%-0.02% of malonic acid, 0.1%-0.3% of a stabilizer and the balance of water, totaling 100%. The partially hydrolyzed polyacrylamide is a low-molecular polymer, the relative molecular mass of the partially hydrolyzed polyacrylamide is 200*10<4> to 300*10<4>, and the hydrolysis degree of the partially hydrolyzed polyacrylamide is 4%-20%. The viscosity of the gel forming liquid provided by the invention is lower than 80mPa. S, the gel plugging rate in a flue gasenvironment can reach 97% or above, and the gel forming liquid can be used as a plugging agent for a low-permeability flue gas drive oil reservoir.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a jelly plugging agent, a preparation method and an application thereof. Background technique [0002] Gas injection production is one of the important ways to improve the recovery of low-permeability reservoirs (50-200mD). Flue gas is the product of organic matter such as natural gas, crude oil or coal after complete combustion, and its main component is N 2 (80%~85%) and CO 2 (15% to 20%) and a small amount of carbon monoxide, hydrogen sulfide, nitrogen oxides, etc. Using flue gas for oil flooding in low-permeability reservoirs can not only achieve CO 2 , carbon monoxide, and nitrogen oxides can also be stored underground, which can also solve the problem of "no water injection and no oil production" in low-permeability oil fields. Due to the low flow rate of flue gas, gas channeling is very easy to occur during flue gas injection, which greatly reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/88C08J3/24C08L33/26
CPCC09K8/512C09K8/5083C09K8/887C09K8/882C08J3/24C09K2208/10C08J2333/26
Inventor 张贵才乔文丽葛际江李建达蒋平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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