Pig lift method with U-shape double strings is easy to be limited by size of casing and very complicated in construction operation process. Thus, the large restrictions exist in the field application.
球塞气举方式采用U型双管柱易受套管尺寸限制，且施工作业较为复杂，其应用受到较大限制。
The outer portions of the guide shoe are made from steel, generally matching the casing in size and threads, if not steel grade.
引鞋的外部由钢制成，一般与套管的尺寸和螺纹匹配，如果钢级不匹配的话。
The outer portions of the float shoe are made of steel and generally match the casing size and threads, although not necessarily the casing grade.
浮鞋的外壁由钢制成，且一般与套管的尺寸和丝扣匹配，然而浮鞋的钢级不一定要与套管钢级一致。
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