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Emission suspension polymer selective water blocking agent and preparation method thereof

A polymer and selective technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing oil phase permeability, restricting oil well water plugging, poor selectivity, etc., to achieve the reduction of water phase permeability, Increase temperature resistance and salt resistance performance and anti-scouring performance, and increase the effect of water phase plugging effect

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the selective plugging agents used in oil well water plugging are water-soluble polymers such as polyacrylamide and its derivatives to generate gel or jelly in the formation to block the formation water, or use oil-based plugging agents to block formation water. Water gels or solidifies to block water channeling, but due to its poor selectivity, it will greatly reduce the oil phase permeability while blocking water, resulting in low liquid after plugging, which restricts the application of oil well water plugging technology

Method used

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preparation example Construction

[0035] Another aspect of the present invention provides the preparation method of the described emulsion suspension polymer selective water blocking agent, which comprises the following steps:

[0036] (1) Weigh acrylamide and N,N-dimethylacrylamide to form an aqueous solution, and adjust the pH value of the aqueous solution to 6-10;

[0037] (2) adding the oil-soluble monomer and the emulsifier to the above-mentioned solution, and forming a stable emulsion after fully stirring;

[0038] (3) adding a water-soluble initiator and an oil-soluble initiator to the emulsion in step (2), fully stirring and emulsification, heating up and initiating polymerization to obtain a selective water blocking agent for emulsion suspension polymer.

[0039] In a preferred embodiment, in step (3), the temperature is raised to 40-60° C., and polymerization is initiated for more than 6 hours, for example, 6-8 hours.

[0040] In a preferred embodiment, in step (3), the water-soluble initiator is us...

Embodiment 1

[0055] The preparation of emulsion suspension polymer selective water blocking agent of the present invention:

[0056] (1) Weigh 2.9g acrylamide and 0.6g N,N-dimethylacrylamide and add them to 300mL of water and stir to fully dissolve, adjust the pH value of the aqueous solution with an alkali to 6.0 to obtain a stable aqueous solution;

[0057] (2) take by weighing 6.0g styrene, 1.5g main emulsifier SDBS and 1.5g co-emulsifier Span 20 and join in above-mentioned solution, form stable emulsion after fully stirring;

[0058] (3) Add 0.2% potassium persulfate aqueous solution 0.15g, 0.1% sodium bisulfite aqueous solution 0.15g and oil-soluble initiator 0.6mg to the emulsion in the second step in turn, and after fully stirring and emulsification, the temperature is raised to 40°C, The polymerization was initiated for 6-8 hours to obtain the polymer water blocking material DSJ1.

[0059] After testing, under the conditions of high temperature (90℃) and high salt (salinity of 50,...

Embodiment 2

[0061] The preparation of emulsion suspension polymer selective water blocking agent of the present invention:

[0062] (1) Weigh 9.0g acrylamide and 6.0g N,N-dimethylacrylamide and add them to 300mL of water and stir to dissolve fully, adjust the pH value of the aqueous solution with an alkali to 7.0 to obtain a stable aqueous solution;

[0063] (2) take by weighing 15.0g styrene, 6.0g main emulsifier SBS and 3.0g co-emulsifier Span 40 and join in above-mentioned solution, form stable emulsion after fully stirring;

[0064] (3) Add 0.2% potassium persulfate aqueous solution 3.75g, 0.1% sodium hydrogen sulfite aqueous solution 3.75g and oil-soluble initiator 7.5mg to the emulsion in the second step in turn, and after fully stirring and emulsification, the temperature is raised to 45°C, The polymerization was initiated for 7 hours to obtain the polymer water blocking material DSJ2.

[0065] After testing, under the conditions of high temperature (90℃) and high salt (salinity o...

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Abstract

The invention relates to an emission suspension polymer selective water blocking agent which comprises the following components: (1) a solution of acrylamide and N,N-dimethyl acrylamide, wherein the total content of the acrylamide and the N,N-dimethyl acrylamide is 0.5-15% by mass, and preferably 1-10% by mass, (2) an oil-soluble monomer, namely styrene or octyl methacrylate, (3) an emulsifier, (4) an initiator, wherein the content of the oil-soluble monomer is 1.0-10% by mass of the total mass of the components (1) to (3), and preferably 1.5-8% by mass. The invention further relates to a preparation method of the selective water blocking agent.

Description

technical field [0001] The invention relates to an emulsion suspension polymer selective water blocking agent and a preparation method thereof. Background technique [0002] Oil well water plugging technology is a key technology to optimize the development results of water injection in oil and gas fields. The water layer and the oil layer in the stratum are intertwined with each other, and the heterogeneity is serious. It is difficult to effectively isolate the two reservoirs with the existing construction technology. Comprehensive water content, for this reason, put forward higher requirements for water plugging agents with high oil / water selectivity. The existing water-based, oil-based, polymer gel and other water blocking systems have certain selectivity, but they block both water and oil. The rate of the system is more than 35%, and the temperature and salt resistance of the system is also poor, and the scope of popularization and application is relatively small. Alth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C08F212/08C08F220/18C08F220/56C08F220/54C08F2/26C08F2/30
CPCC08F2/26C08F2/30C08F212/08C08F220/18C09K8/508C09K8/882C08F220/1808C08F220/56C08F220/54
Inventor 王涛靳彦欣王昊史树彬宋岱锋韦雪陈伟衣哲胡秋平朱妍婷
Owner CHINA PETROLEUM & CHEM CORP
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