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Bionic shale inhibitor and preparation method thereof and drilling fluid and application thereof

A shale inhibitor and drilling fluid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of unsatisfactory performance of shale inhibitors, environmental hazards of shale inhibitors, etc. Wall instability, good environmental performance, high positive charge density effect

Active Publication Date: 2015-07-22
CHINA UNIV OF PETROLEUM (BEIJING) +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 defect that the shale inhibitor performance of the existing drilling fluid is not ideal and the shale inhibitor contained in it is environmentally harmful, and provide a bionic shale inhibitor with high shale inhibitor performance and environmental protection Agent and preparation method thereof, and drilling fluid containing the biomimetic shale inhibitor and application thereof

Method used

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  • Bionic shale inhibitor and preparation method thereof and drilling fluid and application thereof
  • Bionic shale inhibitor and preparation method thereof and drilling fluid and application thereof

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preparation example Construction

[0023] The present invention also provides a method for preparing a bionic shale inhibitor, wherein the method comprises: in the presence of an inorganic acid catalyst, performing a condensation reaction of arginine and lysine; the arginine and lysine The molar ratio of the amount used is 0.2-6:1; the condensation reaction conditions make the weight average molecular weight of the obtained polymer 800-4000g / mol.

[0024] According to the present invention, the above-mentioned arginine can be L-form, D-form or a mixture of the two, and the above-mentioned lysine can be L-form, D-form or a mixture of the two. Preferably L-arginine and L-lysine are used.

[0025] According to the present invention, the amount of the arginine and lysine is not particularly limited, as long as the weight average molecular weight of the product of the condensation reaction is 800-4000 g / mol, preferably, the arginine The molar ratio of amino acid and lysine is 0.3-0.5:1, preferably 1-5:1, preferably...

Embodiment 1

[0052] This example is used to illustrate the biomimetic shale inhibitor of the present invention and its preparation method.

[0053] At 195°C, stir and mix 0.5mol (87.1g) of L-arginine and 0.2mol (29.2g) of L-lysine, and add 1.75mol (171.5g) of phosphoric acid (85% by weight of phosphoric acid aqueous solution), and reacted at 195°C for 16h. After the reaction was completed, when the temperature dropped to about 120° C., 200 g of water was added thereto, and the stirring was continued for 20 minutes until the product was completely dissolved in water. Then, the aqueous solution of the reaction product is taken out and dried at about 120° C. to obtain a solid, which is dissolved in dimethyl sulfoxide, and the insoluble matter is separated from the solution by suction filtration. Then the solution was evaporated to dryness by rotary evaporation to obtain 91.8 g of the biomimetic shale inhibitor of the present invention. Measure its weight-average molecular weight M by gel pe...

Embodiment 2

[0055] This example is used to illustrate the biomimetic shale inhibitor of the present invention and its preparation method.

[0056] At 200°C, stir and mix 0.8mol (139.4g) of L-arginine and 0.2mol (29.2g) of L-lysine, and add 0.35mol (34.3g) of phosphoric acid (85% by weight of phosphoric acid aqueous solution), and reacted at 200°C for 8.5h. After the reaction was completed, when the temperature dropped to about 120° C., 200 g of water was added thereto, and the stirring was continued for 20 minutes until the product was completely dissolved in water. Then, the aqueous solution of the reaction product is taken out and dried at about 120° C. to obtain a solid, which is dissolved in dimethyl sulfoxide, and the insoluble matter is separated from the solution by suction filtration. Then the solution was evaporated to dryness by rotary evaporation to obtain 145.8 g of the biomimetic shale inhibitor of the present invention. Measure its weight-average molecular weight M by gel ...

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Abstract

The invention discloses a bionic shale inhibitor, comprising a structure unit shown in formula (1) and a structure unit shown in formula (2), the molar ratio of the structure unit shown in the formula (1) to the structure unit shown in the formula (2) is 0.26:1; and the shale inhibitor weight-average molecular weight is 800-4000g / mol. The invention also provides a preparation method of the bionic shale inhibitor, and the bionic shale inhibitor prepared by the method. The invention also provides a drilling fluid containing the bionic shale inhibitor and application thereof. The bionic shale inhibitor has high shale inhibition performance, environmental friendliness and no pollution.

Description

technical field [0001] The invention relates to a bionic shale inhibitor, a preparation method thereof, a drilling fluid and an application thereof. Background technique [0002] The problem of maintaining the stability of the drilling well wall is a worldwide problem in the drilling industry. This problem exists in many oil fields in the world and has not been well resolved. As my country's oil and gas exploration and development targets are further oriented toward deep oil and gas resources buried in very complex geological conditions and unconventional resources such as coalbed methane and shale gas, wellbore stability problems are often encountered during the drilling process, which will lead to complex deep wells and shale gas. The slow drilling speed of gas horizontal wells, many complex accidents, long drilling cycle and high cost have seriously affected the exploration and development process of important replacement areas of oil and gas resources in my country. Espe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C08G69/10
CPCC08G69/10C09K8/035C09K8/24C09K2208/12C09K8/04
Inventor 蒋官澄宣扬伍贤柱宋然然陈俊斌王玺欧阳伟罗淘淘王兰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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