Conventional connector for casing string can't meet the demand of seal and connection in solid expandable tubular and presented a new thread structure for an expandable casing connector.
传统的套管接头不能满足连接与密封要求，并设计出了一种新型的膨胀连接螺纹结构。
2
PW, PWF mainly by the pump cover, pump casing, impeller, shaft seal, shaft, and bracket the composition of such components.
PWF主要由泵盖、泵壳、叶轮、轴封、轴、和托架等零部件组成。
3
A device used on the outside of the casing of a well to seal off formations or to protect certain zones.