| 摘要 |
A swivel sub (10) for connection in a work string between a workstring and a downhole apparatus is disclosed. The sub has a first substantially cylindrical body (12), including a sleeve portion (22) having one or more teeth (46) and a second - substantially cylindrical body (28) being partially located within the sleeve portion. The bodies are arranged to rotate relative to each other. A sliding sleeve (48), having one or more teeth (56) arranged mutually engage with the first teeth is axially moveable between disengaged and engaged positions, in one embodiment by a pressure differential being created in the sub. Methods of running the tool are described, with particular application to setting and hanging of liners and screens. The invention also offers advantages for drilling applications. |
