IDEA #771Y5N BOP isolation test tool

A test tool having a body, a mandrel, a ball valve with an actuating mechanism and a bore is lowered on a string of drill pipe and landed in a wellhead housing. A retainer ring with internal threads is carried by the mandrel and engages threads on the body. The retainer ring has a slot which is engaged by a tab on the mandrel, causing the retainer ring and the mandrel to rotate together. The ball valve engages a drive plate which couples with a clutch so that the drive plate may rotate relative to the clutch. A rocker arm engages the drive plate and the mandrel to open and close the ball valve in response to rotation of the mandrel. The test tool is lowered through a riser into a wellhead on pipe below a blowout preventer. The blowout preventer closes around the pipe to form a seal and fluid is pumped down a line to test the blowout preventer. After this test, rotation of the mandrel closes the ball valve automatically. As the mandrel rotates, the retainer ring disengages the body, so that the mandrel and the pipe may be lifted above the BOP. The blowout preventer is moved to a fully closed position and fluid is once again pumped down to test the blowout preventer. https://app.acclaimip.com/pdf/VyMuNlundE3SIy5Tvqd0QblZOTcpOOfCMcPp6FY/US5890541