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Efficient leak-stopping material for drilling, and preparation method thereof

A plugging material and high-efficiency technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult size control, poor plugging effect, easy crossing, etc., and achieve a wide range of particle size distribution and safe construction , the preparation of a simple effect

Active Publication Date: 2016-04-13
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 fibers: too light specific gravity, difficult to control the size, easy to knot, poor fluidity and other factors, the plugging effect is poor during use and the pressure bearing capacity is weak; while particles or The plugging ability of powdery plugging materials for large cracks has limitations; when using bridging plugging materials, there are phenomena of "sealing the door" (the plugging material cannot enter the leaky layer) and "regurgitation" (leaking after plugging)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 20-50 mesh modified pine sawdust 3%, 80-100 mesh modified pine sawdust 10%, 150-250 mesh modified pine sawdust 10%; shell powder 40%; acrylamide, methacryloyloxyethyl 15% of elastic particles copolymerized with dimethyl benzyl ammonium chloride, vinyl tris(2-methoxyethoxy) silane and dimethyl diallyl ammonium chloride; 22% of 100-400 mesh calcium carbonate, Mix and stir evenly under normal temperature and pressure to obtain a high-efficiency plugging material.

[0024] The experimental results show that the high-efficiency plugging material used for drilling can effectively plug the fractures with a fracture width of 1-2mm. During the plugging process, its own fluid loss is very small, and the cracks are densely cemented, which can quickly plug the fractures. Up to 7MPa or more.

Embodiment 2

[0026] 20-50 mesh modified pine sawdust 10%, 80-100 mesh modified pine sawdust 5%, 150-250 mesh modified pine sawdust 15%; shell powder 30%; sodium acrylate, acryloyloxyethyl dimethyl 25% of elastic particles copolymerized with benzyl ammonium chloride, vinyltriethoxysilane, and N,N-methylene bisacrylamide; 15% of calcium carbonate of 100-400 mesh, mixed and stirred evenly at normal temperature and pressure That is, high-efficiency plugging materials are obtained.

[0027] The experimental results show that the high-efficiency plugging material used for drilling can effectively plug the fractures with a fracture width of 2-4mm. During the plugging process, its own fluid loss is very small, and the cracks are densely cemented, which can quickly plug the fractures. Up to 7MPa or more.

Embodiment 3

[0029] 20-50 mesh modified pine sawdust 5%, 80-100 mesh modified pine sawdust 10%, 150-250 mesh modified pine sawdust 15%; shell powder 30%; sodium acrylate, acryloyloxyethyl dimethyl 25% of elastic particles copolymerized with benzyl ammonium chloride, vinyltriethoxysilane, and N,N-methylene bisacrylamide; 15% of calcium carbonate of 100-400 mesh, mixed and stirred evenly at normal temperature and pressure That is, high-efficiency plugging materials are obtained.

[0030] The experimental results show that the high-efficiency plugging material used for drilling can effectively plug the fractures with a fracture width of 1-3mm. During the plugging process, its own fluid loss is very small, and the cracks are densely cemented, which can quickly plug the fractures. Up to 7MPa or more.

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PUM

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Abstract

The present invention discloses an efficient leak-stopping material for drilling, and a preparation method thereof, and relates to the technical field of oil and gas field drilling, wherein the efficient leak-stopping material is characterized by comprising by mass: 10-30% of sawdust, 30-50% of shell powder, 10-30% of elastic particles, and 10-20% of calcium carbonate, wherein the substances are mixed and uniformly stirred at a normal temperature under a normal pressure according to the ratio so as to obtain the efficient leak-stopping material for drilling. According to the present invention, the efficient leak-stopping material has characteristics of high pressure bearing capability, good blocking effect, simple on-site configuration process, safe and reliable construction, and the like.

Description

technical field [0001] The invention relates to a plugging material in the drilling process of oil and gas fields and a preparation method thereof, in particular to a fast and efficient plugging material and a preparation method thereof. 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, Drill sticking, blowout, and even lead to major accidents such as wellbore scrapping, resulting in huge economic losses. The plugging material used for drilling is an indispensable material in the process of drilling leak prevention. The success rate of drilling leak prevention and plugging directly depends on the performance of the plugging material. Therefore, it is of great significance to study the plugging materials. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C08F220/56C08F220/06C08F220/34C08F230/08C08F226/02C08F222/38
Inventor 逯贵广袁俊秀朱魁封心领庞雨微
Owner CHINA PETROLEUM & CHEM CORP
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