| 摘要 |
<p>A downhole valve assembly (12; 812) is operable to control production fluid flow around an obstruction (10) in a production tubing string (22). The obstruction may be caused by another valve or valve assembly (10) located in the production tubing string (22), where the valve (10) is closed and as such blocks flow through the production tubing (22). The downhole valve assembly (12; 812) comprises a tubular body (300) that includes an axial passage (320) extending through the body (300) and one or more ports (380) extending substantially radially through the body. The downhole valve assembly (12; 812) also includes one or more actuating members (420, 470) that are operable to move relative to the body (300). Movement of the actuating members (420, 470) selectively opens the ports (380) such that a fluid flow path (400, 401) through the ports is defined between an annulus region (23) outside of the valve assembly (12; 812) and the axial passage (320) such that the blockage can be bypassed.</p> |
