초록 ▼

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 clo

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).

대표청구항 ▼

[ What is claimed is:] [1.]1. Downhole apparatus for mounting on a string for location in a drilled hole, the apparatus comprising:a tubular body defining a bore, the body adapted for location in larger diameter drilled hole such that there is an annulus defined between the body and the hole wall;a

[ What is claimed is:] [1.]1. Downhole apparatus for mounting on a string for location in a drilled hole, the apparatus comprising:a tubular body defining a bore, the body adapted for location in larger diameter drilled hole such that there is an annulus defined between the body and the hole wall;a packer mounted on said body for sealing the annulus between said body and the wall of the hole;means for closing the body bore below said packer;a fluid actuated valve in the body between said closing means and said packer, the valve being movable between a closed position and an open position for permitting selective fluid communication between the body bore and the exterior of the body, said tubular body being full bore when the valve is in the open position; anda means for transferring fluid pressure from above said packer to said valve, whereby fluid pressure applied to the annulus above said packer may be utilised to operate said valve.