Numerical simulation damage analysis of pipe-cement-rock combination due to the underwater explosion

Electrical explosion of wire (EEW) has been used in the petroleum industry to improve oil recovery because it can generate a controllable and stable shock wave. The pipe-cement-rock combination model has been established to avoid the destruction of integrity between the casing pipe and cement sheath while it is treating the formation to increase oil and gas recovery. The propagation law of shock wave in the combination is simulated by nonlinear dynamics analysis code AUTODYN. What is more, the damage of combination caused by a single explosion and multiple explosions is also studied. The results show that the shock wave attenuates greatly through the casing pipe and cement sheath, but the shock wave propagating in a perforation hole can keep higher pressure, and the multiple explosions will cause cumulative damage to the combination.