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Emulsion 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 and salt resistance and anti-scouring performance, and increase the effect of water phase plugging

Active Publication Date: 2021-05-14
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 emulsion suspension polymer selective water blocking agent, which comprises the following steps:

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

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

[0038] (3) Adding a water-soluble initiator and an oil-soluble initiator to the emulsion in step (2), stirring and emulsifying sufficiently, raising the temperature and initiating polymerization to obtain a selective water shutoff agent for the emulsion suspension polymer.

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

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

Embodiment 1

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

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

[0057] (2) Weigh 6.0g of styrene, 1.5g of main emulsifier SDBS and 1.5g of co-emulsifier Span 20 into the above solution, and form a stable emulsion after fully stirring;

[0058] (3) Add 0.15g of 0.2% potassium persulfate aqueous solution, 0.1% sodium bisulfite aqueous solution 0.15g and oil-soluble initiator 0.6mg successively in the emulsion in the 2nd step, after fully stirring and emulsifying, rise to 40 ℃, Initiate polymerization for 6-8 hours to obtain polymer water blocking material DSJ1.

[0059] After testing, under the conditions of high temperature (90°C) and high salt (salinity: 50,000mg / L), the water shutoff rate of the...

Embodiment 2

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

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

[0063] (2) Weigh 15.0g styrene, 6.0g main emulsifier SBS and 3.0g co-emulsifier Span 40 and add them to the above solution, and form a stable emulsion after fully stirring;

[0064] (3) Add 0.2% potassium persulfate aqueous solution 3.75g, 0.1% sodium bisulfite aqueous solution 3.75g and oil-soluble initiator 7.5mg successively in the emulsion in the 2nd step, after fully stirring and emulsifying, rise to 45 ℃, 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°C) and high salt (salinity: 50,000mg / L), the water shutof...

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Abstract

The present invention relates to an emulsion suspension polymer selective water blocking agent, which comprises the following components: (1) an aqueous solution containing acrylamide and N,N-dimethylacrylamide, wherein acrylamide and N,N-dimethylacrylamide The total content of acrylamide is 0.5-15% by mass, preferably 1-10% by mass; (2) oil-soluble monomer styrene or octyl methacrylate, (3) emulsifier, (4) initiator, wherein Based on the total amount of components (1)-(3), the content of the oil-soluble monomer is 1.0-10% by mass, preferably 1.5-8% by mass. The invention also 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 water injection development results of oil and gas fields. The water layer and the oil layer in the formation are intertwined with each other, and the heterogeneity is serious. The existing construction technology is difficult to effectively isolate the two reservoirs. Considering the water content, higher requirements are put forward for water shutoff agents with high oil / water selectivity. Although the existing water-based, oil-based, polymer gel and other water-blocking systems have certain selectivity, they can both block water and oil. The rate is greater than 35%, and the temperature and salt resistance of the system is also poor, and the scope of popularization and application is relatively small. Although the water-soluble ...

Claims

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Application Information

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Patent Type & Authority Patents(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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