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Carboxyl-modified graphene graft polymer as well as preparation method and application thereof

A technique of grafting polymers and carboxyl modification, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of insufficient temperature and salt resistance, inability to have both temperature and salt resistance, and achieve excellent Salt resistance, excellent fluid loss reduction effect, excellent temperature resistance effect

Active Publication Date: 2021-03-30
CHINA UNIV OF GEOSCIENCES (BEIJING)
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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 provide a carboxyl-modified graphene graft polymerization solution for the existing fluid loss control agents that have insufficient temperature and salt resistance and in many cases cannot have good temperature and salt resistance. substances and their preparation methods and applications

Method used

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  • Carboxyl-modified graphene graft polymer as well as preparation method and application thereof
  • Carboxyl-modified graphene graft polymer as well as preparation method and application thereof
  • Carboxyl-modified graphene graft polymer as well as preparation method and application thereof

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preparation example Construction

[0024] The first aspect of the present invention provides a kind of preparation method of carboxy-modified graphene graft polymer, and the method comprises:

[0025] (1) dissolving acrylamide, benzenesulfonic acid, and N-vinylpyrrolidone in water, then adding carboxy-modified graphene, and adjusting the pH value of the obtained mixture, adding the first emulsifier to obtain an aqueous phase system; The second emulsifier is dissolved in the oil phase to obtain an oil phase system;

[0026] (2) mixing the water phase system with the oil phase system to obtain an inverse emulsion system;

[0027] (3) adding the first initiator to the inverse emulsion system to carry out the first polymerization reaction to obtain an intermediate product system; adding the second initiator to the described intermediate product system to carry out the second polymerization reaction to obtain a pre-product;

[0028] (4) purifying the pre-product, drying and pulverizing to obtain carboxyl-modified g...

Embodiment 1

[0062] (1) Dissolve acrylamide, benzenesulfonic acid and N-vinylpyrrolidone (the total monomer concentration is 40wt%) in deionized water with a monomer mass ratio of 2:3:3, and then add the monomer Carboxyl-modified graphene G1 with a mass of 0.5 wt%, adjust the pH value of the obtained mixture to 7 with sodium hydroxide, add Triton X-100 with a monomer mass of 0.35 wt%, to obtain an aqueous phase system; Span 80 Dissolve in liquid paraffin and keep stirring to obtain an oil phase system; wherein, the mass ratio of Triton X-100:Span 80 is 0.11:1, and the volume ratio of water phase system:oil phase system is 1:1 ;

[0063] (2) Add the water phase system dropwise to the oil phase system for mixing, and at the same time use a high-speed shear emulsification mixer to stir at 6000 rpm, the mixing temperature is 25°C, and the mixing time is 0.5h to obtain a uniform and stable inverse emulsion system;

[0064] (3) Put the inverse emulsion system in the reaction bottle, continue t...

Embodiment 2

[0067] (1) Dissolve acrylamide, benzenesulfonic acid and N-vinylpyrrolidone (the total monomer concentration is 40wt%) in deionized water with a monomer mass ratio of 2:3:3, and then add the monomer Carboxyl-modified graphene G2 with a mass of 1 wt%, adjust the pH value of the obtained mixture to 7.5 with sodium hydroxide, add Triton X-100 with a monomer mass of 0.7 wt%, to obtain an aqueous phase system; put Span 80 in Dissolve in liquid paraffin, and continue to stir to obtain an oil phase system; wherein, the mass ratio of Triton X-100:Span 80 is 0.2:1, and the volume ratio of water phase system:oil phase system is 1:1;

[0068] (2) Add the water phase system dropwise to the oil phase system for mixing, and at the same time use a high-speed shear emulsification mixer to stir at 5500 rpm, the mixing temperature is 25°C, and the mixing time is 0.5h to obtain a uniform and stable inverse emulsion system;

[0069] (3) Put the inverse emulsion system in the reaction bottle, con...

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Abstract

The invention relates to the field of oil exploitation, and discloses a carboxyl-modified graphene graft polymer as well as a preparation method and application thereof. The method comprises the following steps: (1) dissolving acrylamide, benzenesulfonic acid and N-vinyl pyrrolidone in water, adding carboxyl-modified graphene, adding a first emulsifier to prepare an aqueous phase system, and dissolving a second emulsifier in an oil phase to prepare an oil phase system; (2) preparing an inverse emulsion system from the aqueous phase system and the oil phase system; (3) carrying out a first polymerization reaction on the inverse emulsion system to obtain an intermediate product system, and carrying out a second polymerization reaction on the intermediate product system to obtain a pre-product; (4) purifying, drying and crushing the pre-product to obtain the carboxyl-modified graphene graft polymer, wherein the content of the oxygen element in an XPS test result of the carboxyl-modified graphene is not lower than 26 wt%. The polymer provided by the invention is used as a drilling fluid filtrate reducer and has excellent temperature resistance and salt resistance.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a carboxyl-modified graphene graft polymer and its preparation method and application. Background technique [0002] Drilling fluid is a circulating fluid with multiple functions in drilling operations. It promotes the drilling process by suspending cutting, cleaning the borehole, cooling the drill bit, maintaining effective lubrication between the wellbore and drilling equipment, and maintaining proper pressure. During the drilling operation, the liquid phase in the drilling fluid invades the porous formation not only will pollute the formation, but also block the oil and gas outlet flow path of the reservoir or cause the formation to collapse, thus damaging the reservoir and reducing productivity. Therefore, it is necessary to add a fluid loss reducer to the drilling fluid to control the loss of the liquid phase, so as to optimize the quality of the filter cake and reduce the fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F226/10C08F2/32C09K8/03
CPCC08F2/32C08F292/00C09K8/03C08F220/56C08F226/10
Inventor 马京缘安玉秀庞少聪张泽南张仁杰
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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