The difference of well control between UBD and conventionaldrilling;
欠平衡钻井井控与常规钻井井控差异及施工原则;
2
Air drilling is one of the effective means to increase drilling ROP, able to reach an ROP several times that of a conventionaldrilling.
采用空气钻井技术提高钻井机械钻速非常有效,钻速是常规钻井机械的数倍。
3
The rate of penetration of the negative pulse jet assisted drilling can increase from 0.7 to 3.0 in in-house simulation drilling compared to conventionaldrilling.