Downhole apparatus having a rotating valve member

摘要

A downhole apparatus (10) adapted to be run on a workstring in a well bore. The apparatus has a body (12) including ports (42) and a valve (26) which is rotatable to open and close the ports to selectively allow fluid flow through the body between regions of a well bore above and below the apparatus. The valve is rotated via a gearbox (28) and motor (30) in the apparatus. A sealing arrangement between the valve and body is also described. A method of running the apparatus in a well bore and monitoring pressure above the apparatus in order to control opening and closing of the valve under predetermined conditions is presented.

主权项

1. A downhole tool, comprising:
a housing that comprises one or more ports that define a fluid pathway between a bore that extends through at least a portion of the housing and an annulus of a wellbore; a valve assembly that comprises a body and one or more apertures that define a fluid pathway between a throughbore of the body and the one or more ports, the body moveable between a first position that aligns the one or more apertures and the one or more ports to permit fluid communication between the bore and the annulus and a second position that misaligns the one or more apertures and the one or more ports to prevent fluid communication between the bore and the annulus; a drive assembly operatively coupled to the valve assembly and configured to move the body between the first and second positions; and a seal assembly positioned adjacent the one or more ports and comprising a seal member that forms a metal-to-metal seal between the one or more ports and the body when the body is in the second position to prevent fluid communication between the bore and the annulus, the seal member radially moveable relative to the body.