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Preparation method of while-drilling plugging fluid for oil-based drilling fluid

An oil-based drilling fluid and plugging agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor compatibility and failure to meet the deformation and plugging of micron-scale pores and fractures, and achieve easy promotion and reduction The effect of drilling operation cost and ease of use

Active Publication Date: 2015-03-25
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the poor compatibility between existing LWD materials and oil-based drilling fluids, which cannot meet the technical problems of deformation and plugging of micron-scale pores and cracks, and provide a preparation of LWD plugging agents for oil-based drilling fluids method

Method used

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  • Preparation method of while-drilling plugging fluid for oil-based drilling fluid
  • Preparation method of while-drilling plugging fluid for oil-based drilling fluid
  • Preparation method of while-drilling plugging fluid for oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Add 10.4g of AMPS to 80g of water, adjust the pH value to 9-11 with sodium hydroxide, then add 3.55g of AM, 0.15g of N,N-methylenebisacrylamide, and add 16.8g of bentonite, 8.4 1 g of silicon powder forms a uniformly dispersed aqueous solution; 8.4 g of sorbitol fatty acid ester and 3.6 g of alkylphenol polyoxyethylene ether are added in 160 g of white oil. Form a uniformly dispersed suspension system; heat the above system in a water bath at 40°C, add 10 mL of an aqueous solution of 0.17 g of ammonium persulfate and 10 mL of an aqueous solution of 0.17 g of sodium bisulfite under stirring, and the reaction is completed within 3 minutes to obtain the oil Lost circulation agent while drilling for base drilling fluid, its structural formula is:

[0019]

Embodiment 2

[0020] Example 2: Add 12.42g AMPS and 2.84g AA to 66g water, adjust the pH value to 7-11 with sodium hydroxide, then add 7.11g AM, 0.77g N, N-methylenebisacrylamide, fully dissolve and add 21.6 g of bentonite and 10.8g of silicon powder form a uniformly dispersed aqueous solution; add 8.4g of sorbitol fatty acid ester and 3.6g of alkylphenol polyoxyethylene ether into 80g of white oil; In the oil phase, a uniformly dispersed suspension system is formed; heat the above system in a water bath at 40°C, add 10mL aqueous solution of 0.4g ammonium persulfate and 10mL aqueous solution of 1.53g sodium bisulfite under stirring, and the reaction is completed within 3 minutes , to obtain the lost circulation agent while drilling for the oil-based drilling fluid, its structural formula is:

[0021]

Embodiment 3

[0022] Example 3: Add 7.2g of AA to 80g of water, adjust the pH value to 7-11 with sodium hydroxide, then add 7.2g of AM, 1.54g of N,N-methylenebisacrylamide, fully dissolve and add 20g of bluestone powder to form Uniformly dispersed aqueous solution; add 8.4g polyoxyethylene sorbitan monooleate and 4.5g sorbitan monooleate to 148g white oil, after completely dissolving, add the above aqueous solution to the oil phase, a uniformly dispersed suspension system is formed; the above system is heated in a water bath at 40°C, and a 10mL aqueous solution of 0.72g ammonium persulfate and a 10mL aqueous solution of 0.72g sodium bisulfite are added under stirring, and the reaction is completed within 3min to obtain The oil-based drilling fluid is used for plugging while drilling, and its structural formula is:

[0023]

[0024] Product of the present invention is evaluated, and result is as follows:

[0025] (1) Particle size analysis

[0026] The LWD plugging agent obtained in Exa...

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Abstract

The invention relates to a preparation method of a while-drilling plugging fluid for oil-based drilling fluid, belonging to the technical field of drilling fluid treatment in petroleum drilling projects. The preparation method of the while-drilling plugging fluid for oil-based drilling fluid comprises the following steps: dropwise adding an aqueous phase which contains a propylene water-soluble organic monomer A, a water-soluble crosslinking agent B and a powder-like organic material C into oil D which contains a dispersing agent E; and after emulsification, initiating by using an oxidation-reduction initiating system to obtain a stable suspension plugging agent. According to the while-drilling plugging fluid, a deformation function is realized, the fluid has good compatibility with the oil-based drilling fluid, and can resist the temperature which reaches 150 DEG C, the particle size is 1 micron-100 microns, and the permeable loss of the nano-micron-grade cracks and pores in oil-based sludge drilling can be rapidly and effectively blocked, so that the drilling operation cost is reduced; and according to the oil-based while-drilling plugging agent prepared through the method, drying and granulation are not needed, and the agent can be directly used for while-drilling plugging in the oil-based drilling fluid, and is convenient to use and easy to popularize.

Description

technical field [0001] The invention relates to a preparation method of a plugging agent while drilling for oil-based drilling fluid, and belongs to the technical field of drilling fluid treatment agents in petroleum drilling engineering. Background technique [0002] With the deepening of exploration and development of complex formations, domestic unconventional oil and gas resources demand more and more oil-based drilling fluids. As a supporting technology for oil-based drilling fluid, the development and application of oil-based drilling fluid leakage prevention and plugging technology is not mature enough. Since conventional leak-proof and plugging materials are mostly hydrophilic and oleophobic, while oil-based drilling fluids use oil as the continuous phase, the non-wetting properties of leak-proof and plugging materials in oil-based drilling fluids make them compatible with oil-based drilling fluids. Poor properties lead to poor rheological properties of drilling flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/56C08F222/38C08F220/06C08F2/32C08F2/44C09K8/32C09K8/035
Inventor 刘文堂刘昱彤姜雪清耿晓慧郑志军杨海万龙
Owner CHINA PETROCHEMICAL CORP
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