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Amphoteric graphene oxide as well as preparation method and application thereof

A graphene, amphoteric technology, applied in chemical instruments and methods, earthmoving, wellbore/well components, etc., can solve problems such as limited application occasions, short duration of plugging efficiency, and limited temperature resistance

Active Publication Date: 2020-07-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome that the plugging and anti-slumping agent in the prior art is a single physical plugging and cannot be tightly adsorbed on the shale surface. The duration of the plugging effect is short, which is not conducive to underground construction, and is limited by the temperature resistance. Disadvantages of limited application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0026] The polymerizable siloxane modifier is a combination of vinyltriethoxysilane and vinyltrimethoxysilane in a weight ratio of 1:(1-2).

specific Embodiment approach 2

[0028] The polymerizable siloxane modifier is a combination of methylvinyldiethoxysilane and methylvinyldimethoxysilane in a weight ratio of 1:(1-2).

[0029] Preferably, in step (1), the double bond-containing reactive monomer is selected from at least one of methyl methacrylate, methyl acrylate and tert-butyl acrylate.

[0030] Preferably, in step (1), the template agent is polystyrene; preferably, the polystyrene is microspherical particles with an average particle diameter of 500 nm. The average particle diameter of polystyrene in the microspherical particles of the present invention is determined by a particle size analyzer.

[0031] Preferably, relative to the amount of graphene oxide, the template agent is used in excess, for example, the weight ratio of the template agent to the graphene oxide is 1-4:1, preferably 1-2.5:1.

[0032] Preferably, in step (1), the conditions of the contact reaction include: a temperature of 5-40° C. and a time of 10-60 min.

[0033] Pref...

specific Embodiment approach 3

[0041] Based on the total weight of the solvent, the templating agent, the polymerizable siloxane modifier, the double bond-containing reactive monomer and the material B, the polymerizable siloxane modified The dosage of the agent is 1-20% by weight, and the dosage of the reactive monomer containing double bond is 1-10% by weight.

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PUM

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Abstract

The invention relates to the field of oilfield chemistry, in particular to amphoteric graphene oxide as well as a preparation method and application thereof. The preparation method of the amphoteric graphene oxide comprises the following steps: (1) in the presence of a solvent, carrying out a contact reaction on a template agent, a polymerizable siloxane modifier and a double bond-containing reaction monomer to obtain a material A, the double bond-containing reaction monomer being an acrylate monomer; (2) in the presence of an initiator, carrying out a polymerization reaction on the material Aand a material B containing graphene oxide to obtain a material C; and (3) removing the template agent from the material C. The provided amphoteric graphene oxide tightly blocks the surface of shale,the duration of the blocking efficiency is long, the temperature resistance is strong, and the purpose of long-term blocking can be achieved.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a method for preparing amphoteric graphene oxide, the amphoteric graphene oxide prepared by the method and its application in water-based drilling fluid plugging and anti-collapse agents. Background technique [0002] In recent years, with the increasing number of deep wells and ultra-deep wells, the downhole situation has become more and more complex, and the problem of wellbore instability in complex formation environments of deep wells has become particularly prominent. Wellbore instability problems are mainly concentrated in shale formations and fractured formations. The hydration inhibition ability and effective plugging ability of the existing drilling fluid treatment agents and systems are far from meeting the requirements. The suppression and plugging performance of drilling fluid puts forward higher requirements. [0003] The pore throat size of mud shale is less than ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/44E21B33/13
CPCC09K8/035C09K8/44E21B33/13
Inventor 吕开河沈浩坤孙金声黄贤斌白英睿刘敬平王金堂金佳峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)