深水司钻压井法安全压力余量及循环流量计算

eepwater driller’s method is a suitable well killing method for deep water well control. In response to the characteristics of deep water drilling and well control, the method is studied in detail in the article. And the solution method of dynamic safety margin is deduced and the recommended value of static safety margin is given. Based on these, solution method of circulation rate is developed. The conclusions can be drawn through the computation: When well depth and mud weight window are constant, dynamic safety margin increases with well depth increasing and decreases with pit gain rising. When size of choke line is not variable, the first and second circulation rate increases with well depth increasing. When well depth is constant, both circulation rate declines with the size of choke line getting smaller. The first circulation rate declines with the pit gain decreasing, but the second circulation rate has nothing to do with pit gain. The choke line friction loss increases duo to low temperature in deep water. And with the temperature decreasing, the first and second circulation rate decreases.