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Grafted polymer microspheres for oil displacement modification and preparation method thereof

A technology of polymer microspheres and components, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor performance and low strength, and achieve low manufacturing cost, good high temperature and salt resistance, good Effect of Penetration vs. Plugging Performance

Inactive Publication Date: 2017-05-31
CNPC GREATWALL DRILLING ENG
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Problems solved by technology

It overcomes the shortcomings of the existing plugging modifiers, such as low strength, poor performance, degradation, and inability to penetrate deep into the reservoir under the conditions of high temperature and high salt

Method used

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  • Grafted polymer microspheres for oil displacement modification and preparation method thereof

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Embodiment Construction

[0019] A kind of grafted polymer microspheres for regulating and flooding, the components of the polymer microspheres and their mass ratios are: etherified starch: acrylamide: N, N-methylenebisacrylamide: ammonium persulfate = 1 ~2: 0.5~1.5: 0.04~0.2: 0.1~0.5.

[0020] A preparation method of grafted polymer microspheres for regulating and driving, the method steps are as follows:

[0021] 1. Preparation of aqueous phase solution: Take 1-2 parts by mass of etherified starch, add deionized water, adjust the pH value to 8, gelatinize in a constant temperature water bath at 80°C for 0.5h, and weigh 0.5-1.5 parts by mass Add acrylamide into the gelatinized solution in a constant temperature water bath, adjust the volume of the aqueous phase solution to n, so that the concentration of etherified starch in the aqueous phase solution is 50,000-100,000 mg / L, and the concentration of acrylamide in the aqueous phase solution is 25,000- 75000mg / L;

[0022] 2. Preparation of oil phase s...

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Abstract

The invention relates to a profile modifying / water plugging agent for an oil well, in particular to grafted polymer microspheres for oil displacement modification and a preparation method thereof. The grafted polymer microspheres are prepared from etherified starch, acrylamide, N,N-methylene bisacrylamide and ammonium persulfate in the mass ratio of (1-2) to (0.5-1.5) to (0.04-0.2) to (0.1-0.5). The polymer microspheres have the advantages of controllable particle size, high homogeneity, high temperature resistance, high salt resistance, wide raw material source and low manufacturing cost, is not hydrolyzed in a severe saline environment, and is non-degradable; starch microspheres can further go deep into an oil reservoir after being swelled by absorbing water; meanwhile, the polymer microspheres have the rigid characteristic of starch micro molecules and the flexible changeability characteristic of the acrylamide, have high deepening and blocking performance, and are environmentally friendly; by adopting the grafted polymer microspheres, the non-homogeneity of a rock stratum is lowered, and the crude oil recovery factor is increased.

Description

[0001] Technical field: [0002] The invention relates to a profile control and water shutoff agent for oil wells, in particular to a graft polymer microsphere for control and flooding and a preparation method thereof. [0003] Background technique: [0004] In the middle and late stages of oilfield development, due to the existence of stratum heterogeneity, the water flooding development process is not uniform in the plane or in the vertical direction. In addition, the clay swelling and particle migration caused by long-term water flow erosion, etc., further lead to Heterogeneity deteriorates, and large pores or even super-large pores are formed in some oil layers, causing premature water flooding in high-permeability layers between injection and production wells, reducing the sweeping degree of injected water to low-permeability layers, and causing water in surrounding oil wells Rise, or even water flooding, resulting in the failure of oil production in some low-permeability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F222/38C09K8/508C09K8/516
CPCC08F251/00C09K8/5086C09K8/516C08F220/56
Inventor 董家峰彭勃郑观辉张志良乞迎安汪晓多王涛吴捷刘延
Owner CNPC GREATWALL DRILLING ENG
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