Study on the Fatigue Failure Law of Gas Storage Caprock Under Periodic Injection and Production

Whether qualitative or quantitative, whether macroscopic microscopic, Predecessors' research on the sealing ability of caprocks is concentrated static model caprock. A few scholars have also proposed sealability evaluations caprock dynamic evolution process, they are all aimed at geological historical periods, and there studies gas storage under periodic injection production. In this paper, characteristics stress strain alternating loads rock non-rock materials investigated experimentally studied to clarify law fatigue failure injection-production. The results show that it possible microcracks may develop propagate in after has experienced many injections productions, when far less than strength limit, And then a deformation formed. accumulated plastic will increase, rate gradually decrease, as number production increases.