Fracturing Model Experiment of Fengxi Tight Oil Reservoir

In view of the morphology of pressure fracture network in Qaidam high stress carbonate reservoir, a small size true triaxial hydraulic fracturing system was used to carry out full-diameter downhole core fracturing test and evaluate the fracture propagation law. Considering the effects of horizontal stress difference, displacement, fluid viscosity and different lithology, 10 groups of control tests were designed to carry out fracturing physical simulation experiments on the core model samples prepared by full-diameter cores. Combined with the experimental results, the algal limestone of Fengxi reservoir adopts the method of high proportion and low viscosity liquid to create complex fracture network, and the laminated limestone reservoir adopts the technology of “rapid lifting to large displacement + high proportion and high viscosity liquid” to improve the effect of measures and realize the utilization of reservoir benefits.