Multicycle Tester Valve Model C
Controls and shuts in the well downhole to isolate the formation
from the tubing fluids for a buildup period
The Weatherford multicycle tester valve, Model C (MCTV-C) is an annular-pressure-controlled valve that manages wellbore pressure and fluids. The MCTV-C uses a ball valve to hold pressure from above for tubular pressure testing and also to hold pressure from below for measurement of downhole pressure buildup.
A coil spring and nitrogen pressure hold the ball valve in the default closed position. Application of a precalculated annular pressure opens the valve. After the annulus pressure bleeding, a ratchet mechanism maintains the valve in a lock-open position during every second pressure cycle.
During run-in, a referencing system within the valve assembly equalizes the pressure differential between the nitrogen-pressure system of the valve and the fluid hydrostatic pressure. Once the test packer is set, the rupture disk is sheared by a precalculated annulus pressure. This moves the reference piston, which isolates the valve nitrogen pressure from annular pressure. Upon another application of annular pressure, the ball valve opens.
- Drillstem testing
- Production testing
Features and Benefits
- The tester valve is rated for high-pressure, high-temperature (HPHT), and sour-service environments.
- Through application of annulus pressure, the tester valve can be opened and closed over multiple cycles, which provides operational flexibility during drillstem testing and perforating operations.
- The valve can be opened with differential pressure across the ball, which eliminates the time needed to equalize pressure before opening.
- The valve is configured with a lock-open feature for added intervention and well-kill utility.
- The fullbore inside diameter (ID) of the valve facilitates unrestricted flow and access for well interventions.
- The pressure-activated hydrostatic reference system enables using this tool whether the bottomhole assembly is in compression or tension.
- The high-accuracy rupture disk (±2% of nominal burst pressure) enables controlled hydrostatic pressure referencing, which reduces safety risks.