Research on the Reuse Performance of Flowback Fluid From Shale Oil Fracturing

Summary Aiming at the problems of year-on-year increase of shale oil fracturing fluid discharge and transportation difficulties, this paper researches how to specifically remove the characteristic pollutants in the fracturing fluid discharge, thereby laying a theoretical foundation for subsequent further blending and usage. From the results of the water quality analysis of fracturing drainback fluid, it is known that Ca2+ and Mg2+ ions have a greater impact on fracturing fluid blending. The fracturing drainback fluid generated at the site can not be directly blended back into the use of the fracturing drainback fluid, so that the treatment of fracturing drainback fluid is carried out by mesoporous silica, which is strong in adsorption capacity and stable in performance. By confirming the optimal adsorption conditions, the divalent metal ions affecting the fracturing performance can be effectively removed from the return fluid. Compared with the pretreatment, the viscosity of the fracturing return fluid treated with mesoporous silica was significantly improved when it was blended back with the fracturing fluid to meet the construction requirements, which not only guarantees the high-resource treatment of the shale oil fracturing return fluid but also supports the green development of shale oil on a large scale.