Graphene modified ultralow-density propping agent and preparation method thereof

A graphene modification and ultra-low density technology, applied in chemical instruments and methods, earth drilling, mining fluids, etc., can solve problems such as limiting performance, achieve enhanced interface interaction, facilitate heat loss, and avoid brittleness Fracture effect

Inactive Publication Date: 2017-06-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degree of dispersion of graphene in composite materials and its interfacial interaction with the matrix have always been problems that limit its performance from being fully utilized.

Method used

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  • Graphene modified ultralow-density propping agent and preparation method thereof
  • Graphene modified ultralow-density propping agent and preparation method thereof
  • Graphene modified ultralow-density propping agent and preparation method thereof

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Embodiment 1

[0025] The graphene-modified ultra-low density proppant described in this embodiment is prepared by the following method:

[0026] (1) 0.05g graphene (the lateral dimension is 5 μm, and the number of layers is 4 layers) is added to 30g styrene, 3g divinylbenzene, in the mixed solution of 0.3g benzoyl peroxide, stirs 30min to obtain graphene and Styrene and divinylbenzene form a monomer mixture of π-π assembly;

[0027] (2) Add the above-mentioned monomer mixture into 60 g of water in which 3 g of gelatin is dissolved, react under stirring conditions at 48°C for 45 minutes, at 78°C for 3 hours, and at 98°C for 45 minutes to obtain microsphere precipitation, filter, wash, and dry to obtain graphene-modified Ultra-low density proppant.

[0028] The control sample was polymer microspheres obtained without adding graphene under the same conditions.

Embodiment 2

[0030] The graphene-modified ultra-low density proppant described in this embodiment is prepared by the following method:

[0031] (1) Add 0.01g graphene (horizontal size is 0.3μm, the number of layers is 1 layer) to 20g styrene, 0.5g divinylbenzene, 0.1g benzoyl peroxide mixed solution, ultrasonic 15min to get graphite A monomer mixture in which olefin forms π-π assembly with styrene and divinylbenzene;

[0032] (2) Add the above monomer mixture into 40g of water in which 0.5g of gelatin is dissolved, and react under stirring conditions at 45°C for 0.5h, at 75°C for 2h, and at 95°C for 0.5h to obtain microsphere precipitates, which are obtained after filtration, washing and drying Graphene modified ultra-low density proppants.

Embodiment 3

[0034] The graphene-modified ultra-low density proppant described in this embodiment is prepared by the following method:

[0035] (1) 0.1g graphene (the transverse dimension is 50 μm, and the number of layers is 10 layers) is added to 40g styrene, 5g divinylbenzene, in the mixed solution of 0.5g benzoyl peroxide, stirs 60min to obtain graphene and Styrene and divinylbenzene form a monomer mixture of π-π assembly;

[0036] (2) Add the above monomer mixture to 80 g of water in which 5 g of gelatin is dissolved, react under stirring conditions at 50°C for 0.5h, at 80°C for 4h, and at 100°C for 1h to obtain microsphere precipitation, filter, wash, and dry to obtain graphene Modified ultra-low density proppants.

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Abstract

The invention belongs to the field of petroleum and gas fracturing extraction and in particular relates to a graphene modified ultralow-density propping agent and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing graphene, an olefin monomer, a cross-linking agent (divinyl benzene) and an initiator under ultrasonic or stirring conditions so as to obtain a monomer mixture in which a Pi-Pi assembly effect is achieved between graphene and aromatic ring components; adding the monomer mixture into an aqueous solution of dispersing agents, performing the processes of balling, cross-linking and curing under the heating condition so as to obtain a microsphere precipitate; and filtering, washing and drying, thereby obtaining the graphene modified ultralow-density propping agent. According to the method disclosed by the invention, the organic polymer microsphere has low density, while the graphene has the performances of ultrahigh strength, high thermal conductivity and high temperature resistance, and then the composite material has ultralow density as well as the characteristics of high strength and high temperature resistance, so that the deep-well hydraulic fracturing requirement is met.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas fracturing exploitation, and in particular relates to a graphene-modified ultra-low density proppant and a preparation method thereof. Background technique [0002] The fracturing fluid used in the current oil and natural gas fracturing production process is generally a polymer solution, which has a high density and high cost, which will cause damage to the geological core, reduce the ability of the core to flow back, and cause pollution to the environment. To solve these problems, more and more attention has been paid to clean water fracturing technology. Clear water fracturing refers to the hydraulic fracturing operation in which drag reducers, active agents, anti-swelling agents, etc. are added to clean water as working fluids in the transformation of oil and gas fields. In the process of clear water fracturing, proppants with ultra-low density (close to the density of water) are requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80C08F212/08C08F212/36C08F2/44C08F2/20C08K3/04C08F220/14
CPCC09K8/80C08F2/20C08F2/44C08F212/08C08F220/14C08K3/04C08F212/36
Inventor 马睿暴峰高洁陈凯悦胡盼徐莉范金旭
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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