Research and development on thickener for fracturing fluid prepared by coalbed methane flowback water and application

In order to realize a recycling utilization of the fracturing flowback water in the mining process of the coalbed methane well, the Gemini surfactant GM wit h benzene ring was designed and synthesized. The quality concentration of the Gemini surfactant GM affected to the system viscosity, heat resistance and shear resist ance performances and bactericidal performances were investigated. The test results showed that when the quality concentration of the GM reached 2%, the viscosity C ould be 114 m Pa.s.Under the shearing rate condition of49.0 s-1, the crosslinked gel formed would have a shearing of 500 s and the viscosity would be kept stable at 8 0 m Pa.s. When the quality concentration of the Gemini surfactant GM was 0.05%，the bactericidal rate would be over 98%. The Gemini surfactant GM would have a go od compatibility to the other additives. The gel-breaking would be complete and a less harm would be occurred to the reservoir.