The gas drilling technology is increasingly applied these days due to its high ROP, effective prevention of the cave-in of water-sensitive shales and the capability to eliminate lost circulations.
气体钻井由于其机械钻速快,能有效防止水敏性泥页岩坍塌,杜绝井漏。
The Study of Borehole Sloughing Period in Shale Formation of Shahejie of North Dagang Oilfield
北大港油田沙河街泥页岩井壁坍塌周期研究
If the rock above gives way,
如果上方的岩石坍塌或是断裂，
A place where a cave-in has occurred.
坍陷处出现塌陷的地方
When did the roof cave in?
屋顶是什么时候坍塌的？
His fences were continually falling to pieces.
他的篱笆总是坍塌。
The roof of the tunnel caved in (on the workmen).
隧道顶坍塌（压住工人）.
The walls caved in during the earthquake.
墙壁在地震中坍塌了
The roof threatened to fall in.
屋顶有坍塌的危险。
The bridge caved in above the mine
那矿上面的桥梁坍塌了。
The walls blew in because of the pressure.
墙因压力而向内坍塌。
The bridge broke down in an earthquake.
桥在一次地震中坍塌了。
state of being decayed,collapsed or destroyed
破败、坍塌或毁坏的状态
The floor buckled up under the weight of too many people.
由于人太多楼板坍塌了。
the mouldering ruins of an old castle
古堡逐渐坍塌的遗迹.
The bridge broke down under the great pressure
桥在重压下坍塌了。
A collapse, as of a tunnel or structure.
坍陷坍陷，如隧道或建筑的塌陷
RESEARCH ON BOREHOLE COLLAPSE CYCLE IN QINGXI BLOCK OF YUMEN OILFIELD
玉门油田青西区块易坍地层井眼坍塌周期研究