End face with a gap, no boss butt is refers to the upper and lower casing left a certain gap between the upper and lower main chord rod end face at the same time contact.
端面有间隙、无凸台对接是指在上、下套管之间留有一定间隙，上、下主弦杆端面同时接触对接。
Pull-out failure is the main damage form of round thread casing connections.
连接接头滑脱失效是圆螺纹套管损坏的主要形式。
Cement sheath are the main composites for cementing well and isolating the pay zone together with casing pipes.
水泥石是构成井下水泥环的主要材料，它和套管共同起到层间封隔的作用。
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