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Emulsifier, preparation method thereof and oil-based drilling fluid

An emulsifier, amine-based technology, applied in the field of drilling fluid, can solve the problems of electrical stability and thermal stability of oil-based drilling fluid system, barite precipitation, affecting the overall performance of the system, etc., to achieve good emulsion stability and Stability rate, improve fluidity and demulsification voltage, and meet the needs of on-site construction

Inactive Publication Date: 2018-04-17
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Emulsifiers are key components in oil-based drilling fluids. However, most emulsifiers in the prior art will be thermally decomposed and hydrolyzed when the temperature is higher than 180°C, and the HLB value will change. The electrical stability and thermal stability of the oil-based drilling fluid system are greatly reduced, and the emulsion breaks the oil-water layer, resulting in the precipitation of barite, which seriously affects the overall performance of the system

Method used

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  • Emulsifier, preparation method thereof and oil-based drilling fluid
  • Emulsifier, preparation method thereof and oil-based drilling fluid
  • Emulsifier, preparation method thereof and oil-based drilling fluid

Examples

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preparation example Construction

[0033] The invention provides a kind of preparation method of emulsifier, comprising:

[0034] Reaction of amino-containing carboxylic acid with 4 to 10 carbon atoms, dibasic acid with 2 to 10 carbon atoms, aliphatic amine with 3 to 18 carbon atoms and monobasic acid with 12 to 18 carbon atoms , to obtain an emulsifier.

[0035] In the present invention, the preparation method of the emulsifier specifically includes the following steps:

[0036] (1) reacting an amino-containing carboxylic acid with 4 to 10 carbon atoms to obtain a reaction product;

[0037] (2) reacting the reaction product obtained in step (1), the aliphatic amine with 3 to 18 carbon atoms and a part of the dibasic acid with 2 to 10 carbon atoms to obtain a reaction product;

[0038] (3) reacting the reaction product obtained in step (2) with a monobasic acid with 12 to 18 carbon atoms to obtain a reaction product;

[0039] (4) reacting the reaction product obtained in step (3) with a dibasic acid whose ca...

Embodiment 1

[0067] Copolymerize 1.0 mol of aminobutyric acid at 150°C for 3 hours, then add 1.0 mol of oleic acid and 1 mol of tetradecylamine, perform copolymerization at 150°C for 3 hours, then add 1.0 mol of adipic acid Copolymerize at 155°C for 3 hours, finally add 4.0 mol of oleic acid, react at 155°C for 3 hours, and cool naturally to obtain an emulsifier.

[0068] The emulsifier prepared in Example 1 of the present invention is detected by infrared spectroscopy, and the detection results are as follows: figure 1 as shown, figure 1 For the infrared spectrogram of the emulsifier prepared in Example 1 of the present invention, by figure 1 It can be seen that the 1780cm in the picture -1 (C=O), 1710cm -1 (C=O) and 1460cm -1 (C-N) is the characteristic peak of imide, illustrates that amidation reaction has taken place in emulsifying agent synthetic process, and the emulsifying agent that the embodiment of the present invention prepares 1 has following formula structure:

[0069] ...

Embodiment 2

[0077] Copolymerize 1.0 mol of aminocaproic acid at 170°C for 4 hours, then add 1.0 mol of pentadecanoic acid and 1 mol of octadecylamine, perform copolymerization at 170°C for 4 hours, then add 1.0 mol of glutaric acid Copolymerize at 170°C for 4 hours, finally add 4.0 mol of pentadecanoic acid, react at 170°C for 3 hours, and obtain an emulsifier after natural cooling.

[0078] The emulsifier prepared in Example 2 of the present invention is detected by infrared spectroscopy, and the test result is that the emulsifier prepared in Example 2 of the present invention has the following structure:

[0079]

[0080] in,

[0081] R 1 for -HN(CH 2 ) 6 COO-;R 2 for -CH 2 (CH 2 ) 17 -NH 2 ;

[0082] R 3 for -CH 2 (CH 2 ) 13 -COOH;R 4 for -COO-(CH 2 ) 3 -COO-;

[0083] R 5 for -CH 2 (CH 2 ) 4 -.

[0084] According to the method described in the above technical solution, the density and HLB value of the emulsifier prepared in Example 2 of the present invention w...

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Abstract

The invention provides a preparation method of an emulsifier. The emulsifier is prepared from C4-C10 amino-containing carboxylic acid, C2-C10 dibasic acid, C3-C18 aliphatic amine and C12-C18 monobasicacid through a reaction. The emulsifier with a dendritical structure is prepared from the specific raw materials, the heat resisting property of the emulsifier can reach 220 DEG C, the emulsifier hasbetter emulsion stability and stability ratio, flowability of a drilling fluid can be improved by the emulsifier, demulsification voltage can be increased, and site operation demands can be met better. The invention further provides the emulsifier prepared with the method and an oil-based drilling fluid containing the emulsifier.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to an emulsifier, a preparation method thereof and an oil-based drilling fluid. Background technique [0002] With the deepening of petroleum exploration and development, the number of drilling high-temperature deep wells and ultra-deep wells is gradually increasing, such as the piedmont structure in Xinjiang, where the bottom hole temperature is greater than 180°C. While the formation temperature is rising, the stability of the borehole wall is still the key to the success of drilling, and higher requirements are put forward for the drilling fluid system and performance. High temperature resistant oil-based drilling fluid is one of the main technical measures to solve the problem of safe and smooth drilling of high temperature deep wells. Improving the high temperature resistance of oil-based drilling fluid is a technical difficulty, and the choice of emulsifier is the pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/32C08G69/08C08G69/36C08G69/48
CPCC08G69/08C08G69/36C08G69/48C09K8/035C09K8/32
Inventor 刘明华胡小燕黄桂春张滨国安平李文博
Owner 中石化石油工程技术服务有限公司
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