| 摘要 |
A wellbore is cleaned by inserting a conduit 10 into the wellbore, sealing off an annular portion of the wellbore with seals 20, 21, e.g. cup seals, and operating a jet pump 12 within the conduit to move debris located within the sealed area into the conduit for removal from the wellbore. The conduit is centred in the wellbore by a packer 15 and a swivel sub 16 is provided to isolate rotational movement between the two ends of the conduit. |
