Gel particle plugging agent and preparation method and application thereof

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: 2019-08-09
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 gel particle plugging agent and its preparation method and application in order to overcome the problems of poor high temperature res

Method used

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  • Gel particle plugging agent and preparation method and application thereof
  • Gel particle plugging agent and preparation method and application thereof
  • Gel particle plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0073] According to the present invention, the preparation method of the gel particles includes the following steps:

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

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

[0076] (3) Add alginate to mixed liquid b, stir until completely dissolved, to obtain mixed liquid c;

[0077] (4) Add the filler particles to the mixed liquid c, add the dispersing aid, and stir until completely dissolved to 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) Add the initiator to the deionized water and stir until it is completely dissolved to obtain solution f;

[0080] (7) Drop the solution f into the mixed solution e, and after the first reaction, let it stand for the first time to obtain th...

Example Embodiment

[0123] Preparation Example 1

[0124] Preparation of gel particles

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

[0126] (2) Add the non-ionic monomer and the cross-linking agent to the deionized water, stir until completely dissolved to obtain the mixed solution b;

[0127] (3) Add alginate to mixed liquid b, stir until completely dissolved, to obtain mixed liquid c;

[0128] (4) Add the filler particles to the mixed liquid c, add the dispersing aid, and stir until completely dissolved to 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) Add the initiator to the deionized water and stir until it is completely dissolved to obtain solution f;

[0131] (7) Drop the solution f into the mixed solution e, and after the first reaction, let it stand for the first time to obtain the microemulsion g;

[0132] (8) The calcium chloride...

Example Embodiment

[0134] Preparation Example 2

[0135] Preparation of gel particle plugging agent

[0136] (a) Heating the thermoplastic resin to completely melt to obtain a molten thermoplastic resin;

[0137] (b) After the gel particles and the thermoplastic resin melt are stirred and mixed uniformly, the temperature is lowered to obtain a solid phase mixture;

[0138] (c) Grinding the solid phase mixture into powder to prepare 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 leaking stoppage and discloses a gel particle plugging agent and a preparation method and application thereof. The gel particle plugging agent is of a nucleus-shell structure, the nucleus is made from gel particles, and the shell is made from thermoplastic resin; the gel particles are prepared through a reaction of a nonionic monomer, a crosslinking agent, an initiator, alginate, filling particles and water. The gel particle plugging agent has excellent high temperature resistance and has an excellent blocking effect on the high-temperaturedropping stratum.

Description

technical field [0001] The invention relates to the field of drilling fluid plugging, in particular to a 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 composite multifunctional gel is relatively high, bu...

Claims

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Application Information

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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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