Evaluation of plugging performance of functional inorganic fillers

Abstract In order to improve the long-lasting plugging performance of deep filling in fractured reservoirs, this paper evaluates the plugging performance of different filling materials by using the fracture inflow capacity and sand-filled tube drive method. The experimental results show that when the closure pressure is 5MPa, the fracture inflow capacity of quartz sand filling body is about 11μm 2 cm, while the fracture inflow capacity of filling body with inorganic filler particles is 0.1μm 2 cm, the fracture inflow capacity of quartz sand + 9% dual-control temporary plugging agent is about 2.89μm 2 cm, and the fracture inflow capacity of filling body formed by the solidified material after 80°C maintenances for 8h is 0.19μm 2 cm. The experiment of sand-filled tube shows that the permeability of the sand-filled tube formed by the above filling materials is reduced by more than 71.43% compared with that of quartz sand. It can be seen that different types of functional inorganic particles can greatly reduce the permeability of quartz sand filling body, which can reduce the speed of fracture water runoff and realize the requirement of long-lasting plugging of oil and water wells with water runoff fracture.