Sequencing Valve
The flow-activated sequencing valve is designed to actuate downhole coiled tubing tools at a predetermined pressure and to operate as a controlled bleed valve when bleeding down internal coil pressure.
The flow-activated sequencing valve is a normally open valve that allows circulation through the tool to the annulus while running into the well. Once a predetermined differential pressure is exceeded, the flow path to the annulus is closed and diverted into the internal bore of the tool string, thereby enabling hydraulic activation of any tools in the lower and upper ends of the tool string.
When pulling a tool string out of the well, a sequencing valve can be used to safely bleed off internal coil pressure. When the coil pressure is decreased to a predetermined pressure, the sequencing valve opens and allows bleed through its bypass ports. Therefore, during bleed-down the internal/external pressures are balanced, eliminating the possibility of prematurely releasing flow-activated manipulation tools in the lubricator.
The closing differential pressure of the sequencing valve can be field adjusted to between 500 to 2,000 psi.
When ordering sequencing valves, please specify size and thread connection
Features/Benefits
- Normally open, allowing circulation to the annulus while running into wellbore
- Flow activated; no drop ball required
- Simple field adjustment of closing differential pressure
- Quick to dump internal coil pressure at the tool
- Eliminates the possibility of dropping tools in the lubricator
- Suitable for fluid and gas applications