Performance Evaluation and Optimization of Temporary Plugging Agent Used in Diverting Fracturing

Temporary plugging and diverting fracturing is an important method for oil and gas reservoirs stimulation, in which the temporary plugging agent (TPA) plays a vital role. The degradability and plugging performance of JRS-1 fiber TPA and QXD-1 granular TPA were evaluated by the self-designed experimental device. Meanwhile, the fiber TPA and the granular TPA were mixed into a new type of composite TPA. The mixing ratio of fiber and granule was further optimized according to the plugging performance. The results show that the fiber and granule both can be degraded more than 95%, the degradation speed meets the construction requirements, and the damage to reservoir is small. Both the fiber and granular TPA can block the simulated fracture. When the fiber and granule in the composite TPA account for 35–45 wt% and 55–65 wt%, respectively, the plugging effect is better than that of the fiber or granule used alone. When the ratio of the fiber and granule is 40 and 60 wt%, respectively, its plugging performance is the best, and the composite temporary plugging layer can stand the pressure up to 7 MPa above. The results can provide reference for improving the diverting fracturing effect.