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High-temperature and high-pressure oil-based mud system

An oil-based mud, high-temperature and high-pressure technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem that the dispersibility and gel formation rate of organic soils have not been significantly improved, and the performance of oil-based mud cannot be improved. It can improve the lipophilic performance, good film-forming performance and improve the dispersibility of the problem of low utilization rate of the agent.

Active Publication Date: 2021-06-04
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic soils in the prior art generally have the technical defects of poor dispersion and low gelation rate in the oil-based mud system. For this reason, scholars at home and abroad have conducted a lot of research on the modification of organic soils, and most of them use long-chain quaternary Ammonium salts are used to modify organic soil, but the effect is not ideal, the utilization rate of modifier is low, the reaction process is complicated, the dispersion and gelation rate of organic soil have not been significantly improved, and the oil base cannot be improved. mud properties

Method used

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  • High-temperature and high-pressure oil-based mud system

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Effect test

Embodiment 1a

[0029] The invention provides a high-temperature and high-pressure oil-based mud system, which includes the following raw materials in parts by weight: 70 parts of white oil, 7 parts of calcium chloride brine, 2 parts of modified organic soil, and 3 parts of coconut oil fatty acid Ethanolamide, 1 part of wetting agent, 3 parts of limestone powder, 4 parts of humic acid-based graft copolymer and 350 parts of weighting material; the weighting material has a density of 4.2g / cm 3 barite;

[0030] The preparation method of described modified organic soil is:

[0031] In parts by weight, weigh 3 parts of chitosan and 0.8 parts of vinyltriethoxysilane and add it to 50 parts of distilled water, stir evenly and heat to 75°C, stop heating after stirring for 120 minutes, and let it stand for cooling to room temperature, remove the supernatant, collect the first filter residue in the lower part, wash, dry, grind and pulverize until the particle size is less than 100nm to obtain modified ...

Embodiment 1b

[0034] The invention provides a high-temperature and high-pressure oil-based mud system, which includes the following raw materials in parts by weight: 80 parts of mineral oil, 10 parts of calcium chloride brine, 6 parts of modified organic soil, and 8 parts of coconut oil fatty acid two Ethanolamide, 3 parts of wetting agent, 3 parts of limestone powder, 7 parts of humic acid-based graft copolymer and 400 parts of weighting material; the weighting material has a density of 4.4g / cm 3 barite;

[0035] The preparation method of described modified organic soil is:

[0036] In parts by weight, weigh 5 parts of chitosan and 1.2 parts of vinyltriethoxysilane into 60 parts of distilled water, stir evenly and heat to 85°C, stop heating after stirring for 150 minutes, and let it stand for cooling to room temperature, remove the supernatant, collect the first filter residue in the lower part, wash, dry, grind and pulverize until the particle size is less than 100nm to obtain modified c...

Embodiment 1c

[0039] The invention provides a high-temperature and high-pressure oil-based mud system, which includes the following raw materials in parts by weight: 75 parts of white oil, 9 parts of calcium chloride brine, 4 parts of modified organic soil, 6 parts of coconut oil fatty acid two Ethanolamide, 2 parts of wetting agent, 3 parts of limestone powder, 6 parts of humic acid-based graft copolymer and 375 parts of weighting material; the weighting material has a density of 4.3g / cm 3 barite;

[0040] The preparation method of described modified organic soil is:

[0041] In parts by weight, weigh 4 parts of chitosan and 1.0 part of vinyltriethoxysilane into 55 parts of distilled water, stir evenly and heat to 80°C, stop heating after stirring for 135 minutes, and let it stand for cooling to room temperature, remove the supernatant, collect the first filter residue in the lower part, wash, dry, grind and pulverize until the particle size is less than 100nm to obtain modified chitosan;...

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Abstract

The invention discloses high-temperature and high-pressure oil-based mud and a preparation method thereof. The high-temperature and high-pressure oil-based mud comprises the following raw materials by weight: 70-80 parts of base oil, 7-10 parts of calcium chloride brine, 2-6 parts of modified organic soil, 3-8 parts of an emulsifier, 1-3 parts of a wetting agent, 3-4 parts of limestone powder, 4-7 parts of a filtrate reducer and 350-400 parts of a weighting material. The bentonite is modified with vinyltriethoxysilane through an intercalation reaction of the bentonite and chitosan, so that the oil dispersibility, suspension property and colloid property of the organic soil in the oil-based mud are improved, and the high temperature resistance and filtrate loss reduction property of the oil-based mud are further improved.

Description

technical field [0001] The invention relates to the technical field of mud used for oil field drilling. More specifically, the present invention relates to a high temperature and high pressure oil-based mud system. Background technique [0002] Drilling fluid includes water-based mud and oil-based mud. Oil-based mud is a mud system with oil as the continuous phase. Compared with water-based mud, oil-based mud has good lubricity, thermal stability, and shale formation. Stability and outstanding oil layer protection features are gradually widely used in drilling large-position wells, deep wells, and complex wells. [0003] Organic soil is the most basic lipophilic colloid in oil-based mud. In oil-based mud, organic soil is an indispensable additive. Organic soil can not only increase the viscosity and shear force of the mud, but also reduce the fluid loss of the oil-based mud. . The organic soils in the prior art generally have the technical defects of poor dispersion and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C09K8/03
CPCC09K8/32C09K8/03
Inventor 孟虎吴骏峰谷团杨涛贾振甲张晓东王鑫鑫陈玉东
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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