| 摘要 |
There is disclosed a tubing severing tool for use in severing a wellbore tubular. There is also disclosed a well shut-off device and a wellhead comprising such a tubing severing tool. One disclosed tubing severing tool (12) comprises a main housing (14), which can be provided integrally with, for example, a BOP (10), or separately and coupled to the BOP. The tool (12) also comprises a body (16) mounted for rotation relative to the housing (14), and a plurality of tubing severing devices (18). The tubing severing devices (18) are arranged to sever, for example, a casing (3) when the body (16) is rotated relative to the housing (14), and each comprise a tubing severing element (20) and a mounting member (22) for the tubing severing element. The mounting members (22) are mounted for movement relative to the body (16), to urge the tubing severing elements (20) into contact with the casing (3) which is to be severed. The tubing severing elements (20) are each mounted on their respective mounting members (22) in such a way that movement of the tubing severing elements in an axial direction relative to the body, as indicated by arrow (24), is permitted. |
