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High-strength selective water-plugging profile-modifying agent for low-permeability reservoir and preparation method thereof

A water profile control agent, high-strength technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that the water profile control agent cannot be pumped to the reserved area, the curing time is difficult to control, and the water blocking Problems such as poor stability of profile control agent

Inactive Publication Date: 2016-02-17
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1) The water plugging and profile control agent has poor temperature and salt resistance and cannot be applied to high temperature deep wells
[0005] 2) The water plugging profile control agent has poor oil-water selectivity, high cost and difficult industrial production.
[0006] 3) The water plugging profile control agent has poor stability, short life in the formation, and low plugging efficiency
[0007] 4) The curing and gelling time is difficult to control, and the water plugging and profile control agent cannot be completely and accurately pumped to the reserved area

Method used

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  • High-strength selective water-plugging profile-modifying agent for low-permeability reservoir and preparation method thereof
  • High-strength selective water-plugging profile-modifying agent for low-permeability reservoir and preparation method thereof
  • High-strength selective water-plugging profile-modifying agent for low-permeability reservoir and preparation method thereof

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Embodiment Construction

[0025] The present invention is further described below in conjunction with specific implementation, but the present invention is not limited to the following examples.

[0026] The water plugging and profile control agent provided by the present invention is highly resistant to salt, and according to different formation temperatures, the amount of ammonium persulfate can be adjusted, the curing time can be controlled, and the water plugging and profile control agent can be configured, specifically, cyclodextrin is 3%, polyethylene Alcohol is 5%, formaldehyde is 30%, acrylamide is 2%, and the balance is high salinity salt water with a salinity of 10 5 mg / L. Correspondence between curing time and temperature, ammonium persulfate is shown in Table 1:

[0027]

[0028] It can be seen from the data in Table 1 that the water plugging and profile control agent provided by the present invention has the advantages of salt resistance and controllable curing time, and can effectivel...

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Abstract

The invention discloses a high-strength selective water-plugging profile-modifying agent for low-permeability reservoir and a preparation method thereof. The preparation method comprises dissolving cyclodextrin, polyvinyl alcohol, formaldehyde and acrylamide in water to form a zero-viscosity aqueous solution, then adding ammonium sulfate, injecting into underground, performing polymerization reaction under effect of stratum temperature, so as to form a high-strength white blocking substance. The prepared high-strength selective water-plugging profile-modifying agent for low-permeability reservoir possesses the characteristics of good injection property, efficient selectivity, controllable curing time and the like, is resistant to acid and alkali corrosion, and possesses long-term stability.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a high-intensity selective water shutoff and profile control agent for low-permeability oil reservoirs for enhanced crude oil recovery and a preparation method thereof. Background technique [0002] In the low-permeability oil reservoirs in my country, during the water injection development process, due to the serious heterogeneity of the reservoir, the injected water channeled along the high-permeable zone, resulting in poor sweeping effect of the injected water, and the water cut in the oil well production fluid rose rapidly. Technology has always been an effective technical means for oilfields to improve the effect of water injection development and achieve stable production of oil reservoirs. It can effectively control the impact of formation water and injected water on oil wells, reduce water cut in oil wells, improve the production degree of oil lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514C09K8/5045C09K8/5083
Inventor 任海晶刘世川王晓晖刘彦锋李俊莉张颖
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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