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Environment-friendly plugging agent for drilling fluid based on modified basalt fiber powder, and preparation method thereof

A technology of basalt fiber and plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of inability to completely prevent filtrate, poor plugging effect of micro-cracks, clay mineral hydration, etc. Binding force and membrane efficiency, resistance to pressure transmission, good environmental compatibility

Inactive Publication Date: 2021-10-26
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of ultra-fine calcium carbonate is small, and it is mainly used to seal nano-micro pores below 20 μm, but the plugging effect on micro-cracks above 100 μm is poor; unidirectional pressure sealant has better sealing effect on leakage effect, but it has a certain impact on the performance of drilling fluid; asphalt materials have good deformation sealing ability, and have a good sealing effect on micropores, but in the current environment where environmental protection requirements are increasingly strict, its application is becoming more and more difficult. increasingly restricted
For shale formations with micro-pores and fractures, the filter cake formed by most drilling fluids has a poor plugging effect and cannot completely prevent the intrusion of filtrate. Instability, secondly, the intrusion of filtrate will also cause the pressure to increase, which will cause the expansion of the crack, and finally lead to the occurrence of induced leakage

Method used

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  • Environment-friendly plugging agent for drilling fluid based on modified basalt fiber powder, and preparation method thereof
  • Environment-friendly plugging agent for drilling fluid based on modified basalt fiber powder, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The parts by weight of basalt fiber powder are 50 parts, the parts by weight of nano silicon dioxide are 25 parts, the parts by weight of glyceride are 1 part, the parts by weight of silane coupling agent are 2 parts, 4 parts of ethanol, and more The parts by weight of polyfructose are 18 parts. The particle size of the basalt fiber powder is 500 mesh.

[0017] Its preparation method is as follows:

[0018] a) Put basalt mineral powder and nano silicon dioxide in a mixer, spray the mixed solution of silane coupling agent and ethanol while stirring, the weight ratio of silane coupling agent and ethanol is 1:2, stir well to make it evenly mixed ;

[0019] b) heat up to 55°C, and continue to add glyceride while stirring, and stir until uniform;

[0020] c) Control the temperature at 40°C, add polyfructose while continuing to stir, stir well and cool to room temperature to obtain the plugging agent product.

Embodiment 2

[0022] The parts by weight of basalt fiber powder are 70 parts, the parts by weight of nano silicon dioxide are 10 parts, the parts by weight of soybean lecithin are 3 parts, the parts by weight of silane coupling agent are 2 parts, 4 parts of ethanol, The parts by weight of sodium alginate are 11 parts. The particle size of the basalt fiber powder is 100 mesh.

[0023] Its preparation method is as follows:

[0024] a) Put basalt mineral powder and nano silicon dioxide in a mixer, spray the mixed solution of silane coupling agent and ethanol while stirring, the weight ratio of silane coupling agent and ethanol is 1:2, stir well to make it evenly mixed ;

[0025] b) heat up to 60°C, and continue to add soybean lecithin while stirring, fully stir until uniform;

[0026] c) Control the temperature at 50°C, add sodium alginate while continuing to stir, stir well and cool to room temperature to obtain the plugging agent product.

Embodiment 3

[0028] The parts by weight of basalt fiber powder are 60 parts, the parts by weight of nano silicon dioxide are 15 parts, the parts by weight of rhamnolipid are 1 part, the parts by weight of silane coupling agent are 3 parts, and the parts by weight of ethanol are 6 parts , the parts by weight of chitosan is 15 parts. The particle size of the basalt fiber powder is 200 mesh.

[0029] Its preparation method is as follows:

[0030] a) Put basalt mineral powder and nano silicon dioxide in a mixer, spray the mixed solution of silane coupling agent and ethanol while stirring, the weight ratio of silane coupling agent and ethanol is 1:2, stir well to make it evenly mixed ;

[0031] b) heat up to 60°C, and continue to add rhamnolipid while stirring, and stir until uniform;

[0032] c) Control the temperature at 50°C, add chitosan while continuing to stir, fully stir evenly and cool to room temperature to obtain the plugging agent product.

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Abstract

The invention discloses an environment-friendly drilling fluid plugging agent based on modified basalt fiber powder. The plugging agent is prepared from, by weight, 50 to 75 parts of basalt fiber powder, 10 to 25 parts of nano silicon dioxide, 1 to 3 parts of surfactant, 1 to 3 parts of silane coupling agent, 2 to 6 parts of ethanol and 10 to 20 parts of polysaccharide polymer, wherein the surfactant is selected from rhamnolipid, soya bean lecithin, sophorolipid or glyceride; the polysaccharide polymer is chitosan, polyfructose or sodium alginate; and the particle size of the basalt fiber powder is 100 to 500 meshes. The plugging agent is mainly used as a plugging agent and a bridging particle for drilling fluid while drilling, the mechanical strength and the compatibility with the drilling fluid are improved, the chemical binding force with the stratum and the membrane efficiency are improved, all the components are environment-friendly materials, the compatibility with the environment is good, and the current drilling environment-friendly requirement is met.

Description

technical field [0001] The invention relates to a drilling-while-drilling plugging material for petroleum drilling, in particular to an environmental-friendly drilling fluid plugging-while-drilling plugging agent modified by natural minerals for plugging nano-micro pores and fractures in formations. Background technique [0002] In recent years, with the development of oil and gas exploration and development, the number of deep wells and wells in complex formations has gradually increased; various complex accidents have occurred frequently during drilling construction, among which lost circulation and well collapse account for a much higher proportion of complex accidents than others. Especially in the large-scale development of shale oil and gas in recent years, the problem of well leakage and well collapse in mud shale formations with widely developed fractures has become more prominent, which not only caused huge economic losses, but also greatly delayed the exploration an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/467
CPCC09K8/03C09K8/467C09K8/426
Inventor 李公让唐洪林李炳太于雷刘振东李海斌李春光李卉王志伟明玉广黄元俊
Owner 中石化石油工程技术服务有限公司
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