在革掉套管接箍和圆扣套管的前提下，建议采用无接箍、特殊扣型套管，以提高深井的套管强度。
On the premise of abrogating the casing collars and the casings with round thread. the casings with special thread and without collar are recommended to be used. in order…
圆型基板外圆周面上通过一框架抱箍固定设置至少二滚轮。
The external circular surface of the circular type base plate is fixedly provided with at least two rolling wheels by a frame anchor ear.
圆型基板外圆周面上通过一框架抱箍固定设置至少二滚轮。
The external circular surface of the circular type base plate is fixedly provided with at least two rolling wheels by a frame anchor ear.
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