Anti-high temperature "core/shell" structure gel particle plugging agent and its preparation method and application

A gel particle and plugging agent technology, which is applied in the field of drilling fluid plugging, can solve the problems of poor high temperature resistance and low plugging effect of lost channels, and achieve good plugging effect

Active Publication Date: 2020-05-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high temperature resistant "core / shell" structure high temperature gel particle plugging agent in order to overcome the problems of poor high temperature resistance and low plugging effect on leakage channels in the prior art. and its preparation method and application, the gel particle plugging agent has excellent high temperature resistance, and has an excellent plugging effect on high temperature leakage formations

Method used

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  • Anti-high temperature "core/shell" structure gel particle plugging agent and its preparation method and application
  • Anti-high temperature "core/shell" structure gel particle plugging agent and its preparation method and application
  • Anti-high temperature "core/shell" structure gel particle plugging agent and its preparation method and application

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preparation example Construction

[0073] According to the present invention, the preparation method of described gel particle comprises the following steps:

[0074] (1) stirring the lipophilic emulsifier, the hydrophilic emulsifier and the oil phase solvent evenly to obtain solution a;

[0075] (2) adding the non-ionic monomer and the cross-linking agent into the deionized water, stirring until completely dissolved, to obtain the mixed solution b;

[0076] (3) Add alginate into the mixed solution b, stir until completely dissolved, and obtain the mixed solution c;

[0077] (4) Add the filling particles into the mixed liquid c, add a dispersing aid, stir until completely dissolved, and obtain the mixed liquid d;

[0078] (5) Slowly add the mixed solution d to the solution a, and stir to obtain the mixed solution e;

[0079] (6) The initiator is added into deionized water, and stirred until completely dissolved to obtain solution f;

[0080] (7) solution f is added dropwise in mixed solution e, after carryin...

preparation example 1

[0124] Preparation of gel particles

[0125] (1) stirring the lipophilic emulsifier, the hydrophilic emulsifier and the oil phase solvent evenly to obtain solution a;

[0126] (2) adding the non-ionic monomer and the cross-linking agent into the deionized water, stirring until completely dissolved, to obtain the mixed liquid b;

[0127] (3) Add alginate into the mixed solution b, stir until completely dissolved, and obtain the mixed solution c;

[0128] (4) Add the filling particles into the mixed liquid c, add a dispersing aid, stir until completely dissolved, and obtain the mixed liquid d;

[0129] (5) Slowly add the mixed solution d to the solution a, and stir to obtain the mixed solution e;

[0130] (6) The initiator is added into deionized water, and stirred until completely dissolved to obtain solution f;

[0131] (7) solution f is added dropwise in mixed solution e, after carrying out first reaction, carry out stand still for the first time, obtain microemulsion g; ...

preparation example 2

[0135] Preparation of gel particle plugging agent

[0136] (a) heating the thermoplastic resin until it is completely melted to obtain a molten thermoplastic resin;

[0137] (b) stirring and mixing the gel particles and the melted thermoplastic resin evenly, and then performing cooling treatment to obtain a solid phase mixture;

[0138] (c) Grinding the solid phase mixture to make a gel particle plugging agent.

[0139] In order to ensure that the basic conditions of the examples and comparative examples are consistent, in the following examples and comparative examples, the particle size of the gel particle plugging agent with a "core / shell" structure is selected to be 500 μm.

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Abstract

The invention relates to the field of drilling fluid plugging, and discloses a gel particle plugging agent, a preparation method and application thereof. The gel particle plugging agent has a core-shell structure, wherein the core is a gel particle and the shell is a thermoplastic resin; the gel particle is filled with non-ionic monomers, crosslinking agents, initiators, alginates, and Particles react with water. The gel particle lost circulation agent has excellent high temperature resistance and excellent plugging effect on high temperature lost formations.

Description

technical field [0001] The invention relates to the field of drilling fluid plugging, in particular to a high-temperature resistant "core / shell" structure gel particle plugging agent and its preparation method and application. Background technique [0002] Lost circulation is one of the most common downhole complex problems in the current drilling process. It is an accident that seriously affects the safety of drilling engineering. It will not only prolong the drilling cycle, but also bring unnecessary losses to the construction unit. It has a great negative impact on the exploration of underground oil and gas reservoir resources. Therefore, the leakage prevention and plugging of drilling fluid has always been a hot issue in the field of petroleum engineering at home and abroad. Cross-linked polymer gels are commonly used plugging materials to deal with malignant leakage. The mechanical strength of simple polymer gel is relatively low, and the mechanical strength of new co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44
CPCC09K8/426C09K8/44
Inventor 白英睿孙金声吕开河刘敬平黄贤斌王金堂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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