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Plugging agent for drilling fluids, and preparation method thereof

A drilling fluid and plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of poor compatibility of oil-based drilling fluids, poor matching of micropores and microfractures in special shale formations, and plugging. The problem of large particle size of the material can achieve the effect of small oil absorption multiple, good sealing and sealing effect, and improving the pressure bearing capacity of the formation.

Active Publication Date: 2019-12-20
中国石油集团川庆钻探工程有限公司钻井液技术服务公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a drilling method for the problem of large particle size of the plugging material in the prior art, poor compatibility with micropores and microfractures in special shale formations, and poor compatibility with oil-based drilling fluids. Liquid plugging agent and preparation method thereof

Method used

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  • Plugging agent for drilling fluids, and preparation method thereof
  • Plugging agent for drilling fluids, and preparation method thereof
  • Plugging agent for drilling fluids, and preparation method thereof

Examples

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Embodiment 1

[0033] A method for preparing a plugging agent for drilling fluid provided by a preferred embodiment of the present invention, the specific steps are as follows:

[0034] S1. First mix 15 parts by weight of glycidyl methacrylate, 15 parts by weight of hydroxyethyl methacrylate and 15 parts by weight of isopropyl alcohol, then add 0.3 parts by weight of epoxy resin, 1 part by weight of In the mixed solution of dibenzoyl peroxide and 10 parts by weight of isopropanol, after being warmed up to reflux temperature and reacted for 30 minutes, a reaction solution was obtained;

[0035] S2. ultrasonically dispersing silicon dioxide powder with a particle size of 0.0385 mm or less in isopropanol as a solvent to obtain a silicon dioxide dispersion;

[0036] S3. Mix 10 parts by weight of the reaction solution obtained in step S1 with 10 parts by weight of the silica dispersion obtained in step S2, and then slowly add 0.6 parts by weight of epoxy resin and 20 parts by weight of isopropano...

Embodiment 2

[0040] A method for preparing a plugging agent for drilling fluid provided by a preferred embodiment of the present invention, the specific steps are as follows:

[0041] S1. First mix 20 parts by weight of glycidyl methacrylate, 20 parts by weight of hydroxyethyl methacrylate and 20 parts by weight of isopropyl alcohol, then add 2 parts by weight of epoxy resin, 1 part by weight of In the mixed solution of dibenzoyl peroxide and 15 parts by weight of isopropanol, after being warmed up to reflux temperature and reacted for 30 minutes, a reaction solution was obtained;

[0042] S2. ultrasonically dispersing silicon dioxide powder with a particle size of 0.0385 mm or less in isopropanol as a solvent to obtain a silicon dioxide dispersion;

[0043] S3. Mix 15 parts by weight of the reaction solution obtained in step S1 and 10 parts by weight of the silica dispersion obtained in step S2, and then slowly add 4 parts by weight of epoxy resin and 25 parts by weight of isopropanol, an...

Embodiment 3

[0047] A method for preparing a plugging agent for drilling fluid provided by a preferred embodiment of the present invention, the specific steps are as follows:

[0048]S1. First mix 15 parts by weight of glycidyl methacrylate, 16 parts by weight of hydroxyethyl methacrylate and 15 parts by weight of isopropyl alcohol, then add 1.8 parts by weight of epoxy resin, 1 part by weight of In the mixed solution of dibenzoyl peroxide and 11 parts by weight of isopropanol, after being warmed up to reflux temperature for 30 minutes, a reaction solution was obtained;

[0049] S2. ultrasonically dispersing silicon dioxide powder with a particle size of 0.0385 mm or less in isopropanol as a solvent to obtain a silicon dioxide dispersion;

[0050] S3. Mix 10 parts by weight of the reaction solution obtained in step S1 with 10 parts by weight of the silica dispersion obtained in step S2, and then slowly add 2 parts by weight of epoxy resin and 22 parts by weight of isopropanol, and heat the...

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Abstract

The invention discloses a plugging agent for drilling fluids, and a preparation method thereof, wherein the plugging agent used for drilling fluids and having a modified waterborne acrylic resin as amiddle layer, silicon dioxide as a core inside and emulsified white oil as a shell outside is prepared. According to the present invention, the prepared plugging agent solves the problems of high hydrophilicity, large particle size and poor plugging effect on shale micro-crack stratums of the conventional plugging material; and the plugging agent of the invention has little influence on the performance of drilling fluids, easily reduces the filtration loss of drilling fluids and improve the stability of drilling fluids, and has good temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid plugging agents, and in particular relates to a drilling fluid plugging agent and a preparation method thereof. Background technique [0002] The increasingly complex geological conditions in the process of oil and gas exploration and development put forward higher requirements for the stability of the well wall. During the drilling process, the drilling fluid filtrate easily enters the formation through tiny pores under the action of the pressure difference. The transfer effect in the micro-fractures causes the development of fractures, which makes the stability of the wellbore wall worse, and in severe cases, it leads to drilling accidents such as wellbore collapse. [0003] Borehole wall instability is a major engineering problem that has plagued the drilling industry for many years and has yet to be solved. Well wall instability will lead to a series of downhole complex situations such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 陈智杨野于雅璐欧猛梁益谢显涛吴义张斌王姝蕾
Owner 中国石油集团川庆钻探工程有限公司钻井液技术服务公司