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Super-amphiphobic agent for high-temperature-resistant water-based drilling fluid

A super-amphiphobic and amphiphobic agent technology, applied in the direction of drilling composition, inorganic chemistry, fibrous fillers, etc., can solve the problems of increasing the overall cost of drilling fluid treatment agents, difficulty in large-scale application, lost circulation, etc., to achieve Important practical value and economic benefits, the effect of safe and efficient drilling promotion

Active Publication Date: 2021-11-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Blocking and stuck drill
[0009] (3) Lost circulation
However, in the process of drilling unconventional oil and gas, it is difficult for conventional plugging materials to seal nano-micron pores and fractures, which will still lead to the loss of drilling fluid into the reservoir.
[0011] At present, the functions of water-based drilling fluid treatment agents developed at home and abroad are relatively single. They all develop corresponding treatment agents for a single problem to solve complex downhole problems. It is difficult to use one agent for multiple purposes and solve multiple problems. The overall cost of drilling fluid treatment agent is difficult to apply on a large scale, etc.

Method used

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preparation example Construction

[0036] The second aspect of the present invention provides the preparation method of above-mentioned super amphoteric agent, wherein, this method comprises:

[0037] (1) carbon nanotubes are carried out carboxylation treatment in acidic solution;

[0038] (2) carrying out the first contact reaction with the carbon nanotube after carboxylation treatment and the silane coupling agent containing unsaturated carbon-carbon double bond;

[0039] (3) Introducing the formula R into the product after the first contact reaction 1 SO 2 The perfluorosulfonyl halide represented by X and represented by the formula R 3 Si(OR 2 ) 3 Represented siloxane for the second contact reaction.

[0040] Preferably, the acid-containing solution is a mixed solution of a strong acid (selected from concentrated sulfuric acid or concentrated nitric acid) and hydrogen peroxide. Wherein, the sulfuric acid concentration of the concentrated sulfuric acid may be above 70% by weight, especially above 90% by...

Embodiment 5

[0071] Example 5: Single-walled carbon nanotubes are replaced by equimolar multi-walled carbon nanotubes purchased from Beijing Deke Daojin Technology Co., Ltd., with an inner diameter of 10 nm, an outer diameter of 15 nm, and a length of 20,000 nm , After the whole reaction, the final reaction product is the super amphiphobic agent SA-5.

Embodiment 6

[0072] Example 6: Replace KH570 with vinyltrimethoxysilane in an equimolar amount. After the whole reaction, the reaction product finally obtained is the superamphiphobic agent SA-6.

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Abstract

The invention relates to the field of oilfield chemistry in the petroleum industry, in particular to a super-amphiphobic agent for high-temperature-resistant water-based drilling fluid. The super-amphiphobic agent is a modified carbon nanotube with modifying groups on the surface, and the modifying groups comprise modifying groups provided by a silane coupling agent containing unsaturated carbon-carbon double bonds, perfluorosulfonyl halide represented by a formula R1SO2X and siloxane represented by a formula R3Si(OR2)3; wherein R1 is a perfluoro-substituted C4-C12 alkyl group, and X represents halogen; R3 is selected from C1-C6 alkyl and C1-C6 alkoxy, and R2 is selected from C1-C6 alkyl. The super-amphiphobic agent provided by the invention can effectively improve the surface wettability of rock debris and improve the rheological effect of a system, and the super-amphiphobic agent can effectively improve the drilling speed of a well with a complex structure.

Description

technical field [0001] The invention relates to the field of oilfield chemistry in the petroleum industry, in particular to a superamphiphobic agent for high-temperature resistant water-based drilling fluid. Background technique [0002] The amount of unconventional and complex oil and gas resources in my country is huge, ranking second in the world. It is an important replacement resource to ensure the security of my country's energy strategy. Unconventional and complex oil and gas have gradually become the main battlefield of my country's exploration and development, and have become research hotspots in the world. and exploration and development focus. [0003] Under the background that the reservoir conditions for the exploration and development of unconventional and complex oil and gas reservoirs are becoming more and more harsh, and unconventional complex structure wells such as deep wells and horizontal wells are increasingly becoming the development method of unconvent...

Claims

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Application Information

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IPC IPC(8): C09C1/44C09C3/12C09C3/08C01B32/168C07F7/18C09K8/03C09K8/04
CPCC09C1/44C09C3/12C09C3/08C09C3/006C01B32/168C07F7/1896C09K8/03C09K8/04C07B2200/11C09K2208/34
Inventor 蒋官澄倪晓骁贺垠博杨丽丽董腾飞崔凯潇骆小虎罗健生史赫张建国冯雷虞海法邱爱民谭天宇贾东民
Owner CHINA UNIV OF PETROLEUM (BEIJING)