| 摘要 |
Downhole apparatus (10) for mounting on a string (12) for location in a drilled hole is provided, the apparatus comprising: a tubular body (14) defining a bore; a packer (16) mounted on the body (14) for sealing the annulus between the body (14) and the wall of the hole; a plug or valve (18) for closing the body bore (14) below the packer (16); a fluid actuated valve (20) in the body between the bore closing valve (18) and the packer (16) for permitting selective fluid communication between the body bore and the exterior of the body, and an arrangement (22) for transferring fluid pressure from above the packer (16) to the valve (20), whereby fluid pressure applied to the annulus above the packer (16) may be used to operate the valve (20). |
