But for the permeable formation, it is not easy to determine the depth on working site.
而对渗透性漏失地层，其深度在现场往往不容易判断。
The use of air as a circulating medium for drilling is the best way for the development of low pressure and low permeable formation.
空气钻井采用空气作为循环介质，最适低压和低渗透储层的开采。
The chang 61 low permeable reservoir in Yanchang Formation in the Upper Triassic is the main oil layer in Wuqi area.
吴旗地区主力油层为上三叠统延长组长61，属于特低渗储层。
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