Reverse out fluids produced during the test

The single-shot reversing valve operates by applying annulus pressure to burst a rupture disk. Once actuated, the reversing ports are locked open. The valve is typically opened at the completion of the drillstem test (DST) to reverse out fluids produced during the test.

A ratchet keeps the valve in the closed position until the disc is ruptured. When the rupture disc bursts, hydrostatic pressure is applied to the operator mandrel, moving it up against the atmospheric-pressured chamber. This uncovers eight large circulating ports for efficient well-killing operations. Once annulus pressure pushes the mandrel up, the same ratchet locks the mandrel in place to keep the tool open.

The single-shot reversing valve is available in standard, slimhole, and ultrahigh-pressure versions as well as for high-flow and long-duration tests.