Water-based drilling fluid plugging agent

A technology of water-based drilling fluid and plugging agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as poor fluidity, easy to clump, and too light specific gravity, and achieve good hydrophilicity and excellent preparation technology The effect of simple, good suspension stability

Inactive Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When plugging directly with plant fibers such as cottonseed hulls, due to the inherent characteristics of these

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 15% wood fiber, 10% walnut shell, 20% acrylamide and sodium acrylate copolymer particles, and 55% polystyrene-polyacrylamide core-shell microspheres to a kneader at normal temperature and pressure, and mix evenly to obtain A lost circulation agent for water-based drilling fluid.

Embodiment 2

[0020] Add 20% bamboo fiber, 15% walnut shell, 25% acrylamide and sodium acrylate copolymer particles, and 40% polystyrene-polyacrylamide core-shell microspheres to a kneader at normal temperature and pressure, and mix evenly to obtain A lost circulation agent for water-based drilling fluid.

Embodiment 3

[0022] Add 15% glass fiber, 20% walnut shell, 20% vinyl alcohol and acrylic acid copolymer particles, and 45% polystyrene-polyacrylamide core-shell microspheres to a kneader at normal temperature and pressure, and mix evenly to obtain a A plugging agent for water-based drilling fluid.

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PUM

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Abstract

The invention relates to a water-based drilling fluid plugging agent. The water-based drilling fluid plugging agent comprises, by mass, 10% to 20% of fibers, 15% to 25% of walnut shells, 20% to 45% of water-absorbent polymer particles, and 40% to 55% of core-shell polymer microspheres. The water-based drilling fluid plugging agent is prepared through uniformly mixing the above raw materials in a content ratio at the normal temperature under normal pressure. The plugging agent is prepared through simple processes, and has good hydrophilicity, good suspension stability, good expansion performance and good plugging effects.

Description

technical field [0001] The invention relates to a plugging agent for water-based drilling fluid. The plugging agent for water-based drilling fluid prepared by the invention is suitable for the technical field of oil field drilling engineering. Background technique [0002] Lost circulation is a complex problem in the process of drilling, cementing, logging, and workover. It can cause drilling fluid to leak from the wellbore into the lost channel, which not only consumes a lot of mud and plugging materials, but also may cause well collapse and jamming. Drilling, blowout, and even lead to major accidents such as wellbore scrapping, resulting in huge economic losses. The plugging material used for drilling is essential in the leak prevention process of drilling, and the success rate of leak prevention and plugging in drilling directly depends on the performance of the plugging material. Therefore, it is of great significance to study the plugging materials. [0003] At presen...

Claims

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Application Information

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IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08C09K2208/10C09K2208/18
Inventor 徐冬梅袁俊秀封心领逯贵广
Owner CHINA PETROLEUM & CHEM CORP
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