| 摘要 |
A method of running a downhole apparatus into a wellbore is provided. A swivel sub 10 is located between a workstring and a downhole apparatus, and the workstring is run into the wellbore whilst being rotated. A pressure differential is created in the swivel sub to switch between a first position, in which the workstring rotates relative to the downhole apparatus and a second position (fig 2) in which the workstring and at least a portion of the downhole apparatus rotate together. The downhole apparatus may be a liner or screen assembly. The swivel may comprise a sliding sleeve 48 and interlocking teeth 46 (56, fig 3). |
