Patent ID: 6286594
Filing Date: 2001-09-11
Classification: E21B

Abstract:
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.