Plugging agent for plugging cracks, and plugging method thereof

A technology of plugging agent and crack, which is applied in the field of plugging agent for plugging cracks, can solve the problem that the plugging agent cannot have both good plugging and good injectability, and achieve excellent injectability and good plugging performance, high plugging strength and washout resistance

Active Publication Date: 2019-12-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a plugging agent and a plugging method for plugging cracks, so as to solve the problem that existing plugging agents cannot have both good plugging properties and good injectability

Method used

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  • Plugging agent for plugging cracks, and plugging method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The composition of the deep plugging agent is:

[0047] The first component: 7 parts of acrylamide, 0.2 part of anionic polyacrylamide, 0.5 part of ammonium persulfate, and 0.001 part of N,N-dimethylbisacrylamide.

[0048] Second component: 0.5 parts of non-soluble solid particles (perlite particles) and 0.2 parts of anionic polyacrylamide.

[0049] The third component: 0.2 parts of anionic polyacrylamide.

[0050] Water: make up 100 parts according to the amount of the first component, the second component and the third component.

Embodiment 2

[0052] The composition of the deep plugging agent is:

[0053] The first component: 5 parts of acrylamide, 0.1 part of anionic polyacrylamide, 0.1 part of ammonium persulfate; 0.005 part of N, N-dimethylbisacrylamide, anionic polyacrylamide molecular weight 20 million, degree of hydrolysis 20%.

[0054] Second component: 0.1 part of insoluble solid particles (perlite particles) and 0.1 part of anionic polyacrylamide.

[0055] The third component: 0.1 part of anionic polyacrylamide.

[0056] Water: make up 100 parts according to the amount of the first component, the second component and the third component.

Embodiment 3

[0058] The composition of the deep plugging agent is:

[0059] The first component: 8 parts of acrylamide, 0.3 part of anionic polyacrylamide, 1.0 part of ammonium persulfate; 0.03 part of N,N-dimethylbisacrylamide, and the balance is water. The particles are rubber particles. The molecular weight of anionic polyacrylamide is 35 million, and the degree of hydrolysis is 30%.

[0060] Second component: 1 part of non-soluble solid particles (perlite particles) and 0.3 part of anionic polyacrylamide.

[0061] The third component: 0.3 parts of anionic polyacrylamide.

[0062] Water: make up 100 parts according to the amount of the first component, the second component and the third component.

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Abstract

The invention provides a plugging agent for plugging cracks, and a plugging method thereof, wherein the plugging agent comprises a first component and a second component, the first component comprisesa first reactive high polymer, a polymerization monomer, a cross-linking agent and an initiator, and the second component comprises insoluble solid particles and a polymer solution. According to theinvention, by using the plugging agent, oil reservoir cracks can be effectively plugged; the plugging agent has high plugging strength and scouring resistance based on the formation of an organic gel-particle three-dimensional network plugging system; and the first component and the second component have good injectivity before injection, so that the plugging agent of the invention has advantagesof good plugging performance and excellent injectivity.

Description

technical field [0001] The invention relates to the field of oil reservoir exploitation, in particular to a plugging agent for plugging cracks and a plugging method thereof. Background technique [0002] In the process of oil field development, the development of fractured reservoirs faces serious water channeling or agent channeling (such as polymer channeling, surfactant channeling, and jelly channeling, etc.), resulting in ineffective circulation of water injection, polymers or surfactants, Seriously affect the development effect, thereby affecting the recovery rate of the oil field. [0003] In order to solve the problem of channeling in fractured reservoirs, polymer jelly, inorganic gel, particulate matter or composite systems are currently used for plugging. The existing literature provides a plugging method. In this method, the superabsorbent resin is first carried by jelly, and then the acrylic system is injected as a sealing slug. Inorganic gels (such as cement) h...

Claims

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Application Information

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IPC IPC(8): C09K8/46C09K8/467C09K8/50
CPCC09K8/426C09K8/467C09K8/46C09K8/50
Inventor 罗强唐可原风刚白雷李明向小玲李凯王凤清袁恩来孟亚玲曹强
Owner PETROCHINA CO LTD
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