| 摘要 |
<p>A pressure test and bypass valve for use in well testing has a housing (60) defining a central opening (62) therein and a mandrel (126) slidably disposed in the central opening. A ball valve (102) allows fluid flow through the central opening (62) when in an open position and prevents fluid flow therethrough when in a closed position. A sleeve valve (150) allows communication between the central opening (62) and a well annulus when in an open position and prevents communication between the central opening (62) and the well annulus when in a closed position. The ball valve (102) and sleeve valve (150) are actuated substantially simultaneously in response to well annulus pressure. A rupture disc (186) is ruptured due to differential pressure thereacross. This allows well annulus pressure to act across a differential area on the mandrel (126) such that the mandrel is moved relative to the housing (60), thereby actuating the valves (102,150). <IMAGE></p> |
