Graphene resistance-reducing agent for fracturing fluid

Abstract

The invention discloses a graphene resistance-reducing agent for a fracturing fluid. The graphene resistance-reducing agent comprises the following raw materials by weight: 1 to 50 parts of graphene, 5 to 60 parts of a surfactant and 1 to 60 parts of a wetting agent, wherein the surfactant is a nonionic surfactant or anionic surfactant and is one or more selected from a group consisting of alkylphenol polyoxyethylene ether, stearyl alcohol polyoxyethylene polyoxypropylene ether, polyether phosphate, dodecylbenzene sulfonic acid and fatty alcohol ether sodium sulfate-AES. The graphene resistance-reducing agent has the advantages of good resistance-reducing performance, few components, small filtration loss, high viscosity, environment friendliness and good compatibility; through addition of graphene or modified graphene, a lubrication coefficient can be effectively decreased, frictional resistance between the fracturing fluid and a crack wall is lowered and filtration loss is reduced; thus, construction pressure in the process of fracture is reduced, and the graphene resistance-reducing agent is applicable to large-scale large-discharge volume fracture technology. The graphene or modified graphene resistance-reducing agent has good compatibility with a reservoir in the process of fracture and acidification, does not contain mineral oil and poses no pollution to the reservoir and environment.

Description

technical field [0001] The invention relates to a drag reducing agent for fracturing fluid, in particular to a graphene drag reducing agent for fracturing fluid. Background technique [0002] Fracturing and acidizing are the main production stimulation measures for oil and gas field development. The fracturing fluid is the working fluid in the fracturing process. The fracturing fluid is a fluid ore (gas, steam, oil, fresh water, brine, hot water, etc.) in the mining process, in order to obtain high yield and borrow the liquid conduction force (such as hydraulic power, etc.) Fluids used in fracturing operations. The process of hydraulic fracturing of oil and gas layers is to use high-pressure and large-displacement pumps on the ground, and use the principle of liquid pressure transmission to inject fracturing fluid with a certain viscosity into the oil layer at a pressure greater than the absorption capacity of the oil layer, and gradually increase the pressure in the wellbo...

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Problems solved by technology

[0007] In the above disclosed patents, the lubricity of the fracturing fluid can be increased, but the first two drag reducers are oil-based drag reducers, which have high production costs and are easy to pollute the environment; although the latter is not an oil-based drag reducer, However, the resistance reduction performance of polyethylene oxide is not good enough, and it cannot meet the technical requirements in hydraulic fracturing of large-scale and large-displacement oil and gas wells.

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