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Superamphiphobic composites and their applications as inhibitors, lubricants and reservoir protectants in water-based drilling fluids

A water-based drilling fluid and composite material technology, applied in the field of oil and gas drilling, can solve the problems of difficult large-scale application, complex synthesis process, poor high temperature resistance, etc., and achieve low toxicity, strong hydrophobicity, strong resistance and viscosity reduction Effect

Active Publication Date: 2018-12-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the water-based drilling fluid inhibitors, lubricants, and oil and gas layer protection agents developed at home and abroad all have problems such as complex synthesis process, poor high temperature resistance, and difficulty in large-scale application.

Method used

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  • Superamphiphobic composites and their applications as inhibitors, lubricants and reservoir protectants in water-based drilling fluids
  • Superamphiphobic composites and their applications as inhibitors, lubricants and reservoir protectants in water-based drilling fluids
  • Superamphiphobic composites and their applications as inhibitors, lubricants and reservoir protectants in water-based drilling fluids

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preparation example Construction

[0014] One aspect of the present invention provides a method for preparing an amphobic composite material, the method comprising:

[0015] Under alkaline conditions, in a mixed solvent of alcohol and water, nano-TiO 2 and nano-SiO 2 Perform the first mixing to obtain nano-TiO 2 and nano-SiO 2 The dispersion liquid; Then the fluorine-containing silicon coupling agent is introduced into the nano-TiO 2 and nano-SiO 2 in the dispersion liquid and carry out the second mixing;

[0016] Among them, TiO 2 , SiO 2 The molar ratio of the fluorine-containing silicon coupling agent is 1:0.5-5:0.01-0.5, and the nano-TiO 2 The particle size is 50-500nm, the nano-SiO 2 The particle size is 50-500nm.

[0017] The amphiphobic composite material prepared by the method of the present invention can be used as an amphiphobic inhibitor, a lubricant, and an oil and gas layer protection agent in water-based drilling fluids. A layer of adsorption layer with hydrophobic and oleophobic propert...

Embodiment 1

[0039] This example is used to illustrate the amphobic composite material of the present invention and its preparation method.

[0040] TiO with a total weight of 5 g 2 Nanoparticles (TiO with a particle size of 100nm 2 nanospheres) and SiO 2 Nanoparticles (SiO with a particle size of 100nm 2 nanospheres) (wherein, TiO 2 and SiO 2 molar ratio of 1:1) was added to 50mL of ethanol and water mixed solvent (ethanol / water volume ratio of 1:2), and the pH value of the system was adjusted to 8 with ammonia water, and then ultrasonically dispersed at 25°C for 20min to obtain Dispersion liquid; Then dodecafluoroheptyltrimethoxysilane (its consumption makes TiO 2 The molar ratio of dodecafluoroheptyltrimethoxysilane to dodecafluoroheptyltrimethoxysilane is 1:0.1) was added to the dispersion, and stirred at 500rpm at 60°C for 12h, the resulting product was centrifuged, the solid phase was washed with water, and heated at 80°C Under drying, the amphiphobic composite material AN-1 ca...

Embodiment 2

[0042] This example is used to illustrate the amphobic composite material of the present invention and its preparation method.

[0043] TiO with a total weight of 5 g 2 Nanoparticles (TiO with a particle size of 100nm 2 nanospheres) and SiO 2 Nanoparticles (SiO with a particle size of 100nm 2 nanospheres) (wherein, TiO 2 and SiO 2 The molar ratio is 1:1.5) was added to 50mL methanol and water mixed solvent (methanol / water volume ratio is 1:5), and the pH value of the system was adjusted to 8.5 with ammonia water, and then ultrasonically dispersed at 25°C for 15min to obtain Dispersion liquid; Then dodecafluoroheptyltrimethoxysilane (its consumption makes TiO 2 The molar ratio of dodecafluoroheptyltrimethoxysilane to dodecafluoroheptyltrimethoxysilane is 1:0.15) was added to the dispersion liquid, and stirred at 450rpm at 65°C for 12h, the obtained product was centrifuged, the solid phase was washed with water, and heated at 80°C Under drying, the amphiphobic composite ma...

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Abstract

The invention relates to the field of oil and gas drilling, in particular to a super-hydrophobic composite material, and application of the super-hydrophobic composite material used as an inhibitor, alubricant and a hydrocarbon reservoir protective agent in water-based drilling fluid. A preparation method of an amphiphobic composite material comprises the steps of under an alkaline condition, inan ethanol-water mixture solvent, mixing nanometer TiO2 and nanometer SiO2 for the first time, and obtaining dispersion liquid of the nanometer TiO2 and the nanometer SiO2; then introducing a fluorine-containing silicon coupling agent into the dispersion liquid of the nanometer TiO2 and the nanometer SiO2, and mixing for the second time. The amphiphobic composite material provided by the inventioncan be used in the water-based drilling fluid, has the effect of strongly inhibiting hydrous disintegration, is low in toxicity and good in compatibility, can effectively solve the problems of wellbore instability, drill jamming, reservoir damage and the like, further promotes development and application of high-difficulty wells such as extra-deep wells, horizontal wells and large displacement wells in a clay shale-containing formation, and has long-term practical value and economic benefit.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a super-hydrophobic composite material and its application in water-based drilling fluid as an inhibitor, a lubricant and an oil and gas layer protection agent. Background technique [0002] With the increasing development of drilling technology, difficult wells such as ultra-deep wells, horizontal wells, and extended-reach wells have increasingly become the main direction of oil and gas drilling. However, in the development process of these well types, it is easy to encounter problems such as tripping resistance, low ROP, pipe sticking, wellbore instability, and reservoir damage. These problems are largely due to the mud shale formation encountered during the drilling process. The mud shale hydrates and swells and disperses when encountering traditional drilling fluids, which makes it difficult to drill effective oil and gas layers in some areas, and at the same time causes r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/10C09K2208/12C09K2208/34
Inventor 蒋官澄倪晓骁高德利马光长伍贤柱杨丽丽王玺孙金声蒲晓林王凯邓正强刘凡贺垠博李新亮
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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