摘要
文中在常规的井壁岩石坚固程度判别式的基础上，导出适应各种地应力条件的井壁岩石坚固程度判别式，并认为它是确定欠平衡钻井最大生产压差的关键因素。在σＨ＞σＶ＞σｈ的地应力条件下，水平并比垂直井井壁更坚固；欠平衡钻井时，许用的生产压差也最大，这对现场欠平衡钻井作业具有较大的参考价值。
On the basis of discriminant of regular wellbore rock solidity, a wellbore rock solidity discriminantfor all kinds of stress conditions is induced. It is considered a key factor for determining maximum producing differential pressure for underbalanced drilling. When the earth stresses H>V>h， horizontal wellbore is more stable than vertical wellbore.and so permissible producing differential prssure is the highest, which has major reference value for on-site underbalanced drilling operations.
出处
《钻采工艺》
CAS
1999年第4期1-3,共3页
Drilling & Production Technology
关键词
欠平衡钻井
生产压差
钻井
产层坚固程度
underbalanced drilling, producing differential pressure, stress, analysis
