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Copolymer and its application and oil-based drilling fluid stabilizer and its preparation method and oil-based drilling fluid

A technology of oil-based drilling fluid and copolymer, which is applied in the field of oil-based drilling fluid, can solve the problems of poor stability of oil-based drilling fluid, etc., and achieve the effects of cleaning the wellbore, improving the stability of the settlement, and improving the stability of the emulsion

Active Publication Date: 2020-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of poor stability of oil-based drilling fluid in the prior art under high temperature conditions, to provide a copolymer and its application, oil-based drilling fluid stabilizer and its preparation method and oil-based drilling fluid liquid

Method used

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  • Copolymer and its application and oil-based drilling fluid stabilizer and its preparation method and oil-based drilling fluid
  • Copolymer and its application and oil-based drilling fluid stabilizer and its preparation method and oil-based drilling fluid
  • Copolymer and its application and oil-based drilling fluid stabilizer and its preparation method and oil-based drilling fluid

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preparation example Construction

[0026] The fourth aspect of the present invention provides a kind of preparation method of oil-based drilling fluid stabilizer, wherein, the preparation method comprises:

[0027] (1) fatty acid and fatty acid polymer are mixed and dissolved;

[0028] (2) performing the first reaction at 150-200° C. after mixing the mixture obtained in step (1) with the polyamine compound;

[0029] (3) Cool the reaction product obtained in step (2) to 20-35°C and mix it with diacid and / or dianhydride, and then carry out the second reaction at 150-200°C;

[0030] And optionally, after cooling the reaction product of the second reaction to 50-70° C., it is mixed with unsaturated fatty acid for dilution.

[0031] In the present invention, preferably, the molar ratio of fatty acid, fatty acid polymer, polyamine compound, diacid and / or dianhydride is 1:1-3:0.1-0.5::0.03-0.1, preferably 1:2 -2.5: 0.2-0.4: 0.03-0.05.

[0032] In the present invention, in order to further improve the performance ef...

Embodiment 1

[0044] (1) Mix oleic acid and dimerized fatty acid (purchased from Shanghai Zhipu Chemical Co., Ltd., trade mark is DMA-1080) to fully dissolve the dimerized fatty acid;

[0045](2) Mix the mixture obtained in step (1) with tetraethylenepentamine, react for 6 hours under the condition of an oil bath at 170°C, and remove the moisture generated by the reaction during the reaction;

[0046] (3) After the above reaction is completed, cool the system to 20°C, add adipic acid, raise the temperature to 170°C at a rate of 10°C / min, and react for 4 hours.

[0047] (4) After the reaction is finished, the reaction product is cooled to 60° C., and the same volume of oleic acid as the product is added for dilution.

[0048] Among them, the molar ratio of oleic acid, dimer fatty acid, tetraethylenepentamine and adipic acid is 1:2.5:0.3:0.05. Stabilizer A1 was obtained.

Embodiment 2

[0050] (1) Mix linolenic acid and dimerized fatty acid (purchased from Shanghai Zhipu Chemical Co., Ltd., brand name is DMA-1080) to fully dissolve the dimerized fatty acid;

[0051] (2) Mix the mixture obtained in step (1) with triethylenediamine, and react for 8 hours under the condition of an oil bath at 150° C., and remove the moisture generated by the reaction during the reaction;

[0052] (3) After the above reaction is completed, cool the system to 30°C, add maleic anhydride, raise the temperature to 150°C at a rate of 15°C / min, and react for 3 hours.

[0053] (4) After the reaction is finished, the reaction product is cooled to 60° C., and the same volume of oleic acid as the product is added for dilution.

[0054] Among them, the molar ratio of oleic acid, dimer fatty acid, triethylenediamine and maleic anhydride is 1:2:0.2:0.03. Stabilizer A2 is obtained.

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Abstract

The invention relates to the technical field of oilfield chemistry, and discloses a copolymer and application thereof, an oil-based drilling fluid stabilizer and a preparation method thereof, and an oil-based drilling fluid, and the copolymer comprises a structural unit provided by a fatty acid, a structural unit provided by a fatty acid polymer, a structural unit provided by a polyamine compound,and a structural unit provided by a diacid and / or an acid anhydride. The oil-based drilling fluid stabilizer containing the copolymer is added to the oil-based drilling fluid to improve the emulsionstability and sedimentation stability of the oil-based drilling fluid, and has good high temperature resistance, and the purpose of safe drilling can be achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a copolymer and its application, an oil-based drilling fluid stabilizer, a preparation method thereof, and an oil-based drilling fluid. Background technique [0002] With the development of oil and gas exploration and development towards deeper and more complex formations, more and more difficulties are faced in the drilling process. Oil-based drilling fluid has been widely used in deep wells, ultra-deep wells, horizontal wells, extended-reach wells and complex formation conditions due to its superior performance in temperature resistance, inhibition, lubrication, and protection of oil and gas layers compared with water-based drilling fluids. Oil-based drilling fluid is a kind of drilling fluid based on water-in-oil emulsion. The main components are: oil phase (diesel oil, mineral oil, etc.), brine, emulsifier, fluid loss control agent, organic soil, and weighting mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/34C09K8/035C09K8/32
CPCC08G69/34C09K8/035C09K8/32
Inventor 黄贤斌孙金声吕开河刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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