Simulated calculation of well killing by additional flow rate method

Additional flow rate method is a new effective well killing method in deep water. Based on the characteristics of deep water well control, multi -phase flowing control equations of well killing progress for additional flow rate method were established, and the solution method was given. The simulation results show that when the additional flow rate method is used in certain circulation rate, the choke line friction, well head back pressure and drilling fluid equivalent circulating density of well bottom pressure decrease and choke line pressure increases. But the method is not suitable with the circulation rate and additional flow rate ratio increasing. Therefore, the suitable circulation rate and additional flow rate ratio should be chosen by simulated calculation before using the method in order to accomplish well killing successfully.