Multifunctional reversed-phase suspension resistance reducing agent system for shale gas factory-like sand fracturing fluid

Abstract

The invention relates to the technical field of resistance reducing agents, and discloses a multifunctional reversed-phase suspension resistance reducing agent system for shale gas factory-like sand fracturing fluid, which comprises an oil phase, a water-soluble monomer, a suspending agent, an initiator, a surfactant A, a surfactant B, a cleanup additive, an anti-swelling agent and clear water, the surfactant A is one or a composition of more of nonylphenol polyoxyethylene ether, span 80 and Tween; the surfactant B is one or a composition of more of alkylaryl polyoxyethylene ether and 12-hydroxystearic acid-polyoxyethylene ether; the surfactant B is one or a composition of more of alkylaryl polyoxyethylene ether and 12-hydroxystearic acid-polyoxyethylene ether; the discharge aiding agent is organic fluorocarbon; the anti-swelling agent is hexamethylenetetramine ammonium chloride. The scheme has the beneficial effects that the resistance reducing agent prepared by adopting a reversed-phase suspension polymerization method is quick in dispersion and dissolution time in water, high in viscosity and low in friction resistance, and can effectively reduce the friction resistance of fracturing construction, reduce the pumping pressure of construction and reduce the safety risk of construction at the same time; the system has discharge aiding and anti-swelling performance, and a discharge aiding agent and an anti-swelling agent do not need to be additionally pumped through a fracturing blender truck during construction.

Description

technical field [0001] The invention relates to the technical field of drag-reducing agents, in particular to a multifunctional reversed-phase suspension drag-reducing agent system for shale gas industrialized sand fracturing fluid. Background technique [0002] As an important unconventional natural gas resource, shale gas development has developed rapidly in my country in recent years, attracting extensive attention from all walks of life. [0003] In the process of shale gas exploitation, it is necessary to reform the reservoir volume by fracturing to generate complex fracture network diversion, thereby improving the recovery rate. The shale gas reserves in the Sichuan-Chongqing region are very rich. At present, the shale gas in the Sichuan-Chongqing region has entered the stage of large-scale exploration and development, and the shale gas slick water and sand fracturing reservoir reconstruction is the current shale gas in the Sichuan-Chongqing region. An important means...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the drag reducers commonly used in China are prepared by dispersion polymerization, which is produced by the copolymerization of one or more different monomers such as polyacrylamide. During construction, it is necessary to pump additional drainage aid and anti-swelling agent through the sand mixer, which increases the construction process and production cost

[0005] Moreover, the commonly used drag reducing agents in China have a long dissolution and dispersion time in water, and slow viscous time. When the addition amount is 0.1%, the kinematic viscosity is 1-1.65mm2 / s, the viscosity is low, and the drag reduction rate is generally 65%~ Between 70%, the effect of reducing friction can not be achieved in the on-site sand fracturing operation, resulting in high construction pump pressure and increasing construction safety risks