Water-based drilling fluid plugging material and preparation method thereof

A technology of water-based drilling fluid and plugging materials, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor plugging effect, weak pressure bearing capacity, and limitations of large fracture plugging capabilities, etc. Achieve the effects of safe construction, simple preparation and wide particle size distribution

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

In view of the problems of poor plugging effect, weak pressure bearing capacity and limited plugging ability of large fractures at present, the development of a high-efficiency plugging material has great practical significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 10% polyvinyl alcohol, 30% polyacrylamide; 10% chromium acetate; 5% sodium phosphate; 5% 50-100 mesh pine sawdust, 10% 150-200 mesh pine sawdust, 10% 200-300 mesh pine sawdust; 200-400 mesh calcium carbonate 20%, mixed and stirred evenly under normal temperature and pressure to obtain water-based drilling fluid plugging material.

[0029] The experimental results show that the water-based drilling fluid plugging material has good dispersion performance in oil-based drilling fluid, and can effectively seal fractures with a fracture width of 1-2 mm. It is compact and can quickly seal cracks, with a pressure bearing capacity of 7.5MPa.

Embodiment 2

[0031] Polyphenolic resin 20%, acrylic resin 20%; chromium acetate 8%; sodium phosphate 7%; 50~100 mesh pine sawdust 10%, 150-200 mesh pine sawdust 5%, 200~300 mesh pine sawdust 10%; ~400 mesh calcium carbonate 20%, mixed and stirred evenly under normal temperature and pressure to obtain water-based drilling fluid plugging material.

[0032] The experimental results show that the water-based drilling fluid plugging material has good dispersion performance in oil-based drilling fluid, and can effectively seal fractures with a fracture width of 2-3mm. It is compact and can quickly seal cracks, with a pressure bearing capacity of 8MPa.

Embodiment 3

[0034] Polyvinyl alcohol 10%, urea-formaldehyde resin 30%; borax 5%, chromium propionate 5%; EDTA 5%; 50-100 mesh pine sawdust 5%, 150-200 mesh pine sawdust 5%, 200-300 mesh pine sawdust 10% %; 200~400 mesh calcium carbonate 25%, mixed and stirred evenly under normal temperature and pressure to obtain water-based drilling fluid plugging material.

[0035] The experimental results show that the water-based drilling fluid plugging material has good dispersion performance in oil-based drilling fluid, and can effectively seal fractures with a fracture width of 1-2mm. It is compact and can quickly seal cracks, with a pressure bearing capacity of 8.5MPa.

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PUM

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Abstract

The invention discloses a water-based drilling fluid plugging material and a preparation method thereof, and relates to the technical field of water-based drilling fluid plugging materials. The water-based drilling fluid plugging material is characterized by comprising, by mass, 20-50% of water-soluble expansion materials, 5-15% of a cross-linking agent, 5-10% of a retarder, 10-25% of modified fibers and 10-30% of calcium carbonate. The water-based drilling fluid plugging material has the advantages of being large in plugging coverage, high in pressure bearing capacity, good in plugging effect, simple in site configuration process and the like, and can achieve the purposes of reducing the well leakage loss and reducing the composite cost.

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 water-based drilling fluid 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 pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08C09K2208/18
Inventor 逯贵广朱魁庞雨微
Owner CHINA PETROLEUM & CHEM CORP
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