The TCO Multi Cycle Valve (MCV) reduces costs and operational risk, providing a unique combination of security and flexibility for oil and gas field operators performing completion operations. When the MCV is installed above the TDP glass barrier plug, the tubing string fills automatically as the completion is run in hole. The MCV also enables the operator to displace well fluids in both directions, and provides the assurance of a permanent seal after final closing. The MCV is based on TCO's patented Venturi Effect Closing System.
As its name suggests, the Multi Cycle Valve (MCV) features a multi-cycle function. It allows circulation from the annulus to the tubing and from the tubing to the annulus, and enables the operator to repeatedly displace heavy fluid to a lighter packer fluid. The MCV is finally closed by increasing the tubing to annulus circulation rate to above the pre-set closing rate, which causes the MCV sleeve to seal off permanently. In contrast, a conventional single cycle valve will immediately seal off the first time the well is pressured up.
The MCV makes use of an internally activated lockout sleeve. Once the shear pin value is exceeded, the sleeve shifts position to permanently close the valve. Pump rates of up to 2 barrels per minute will not activate the MCV. At rates of 3-4 barrels per minute, the valve's temporary closing function is activated. Further increasing the pressure locks an additional closing sleeve into place, ensuring that the MCV is permanently closed.
The MCV may be qualified in accordance with the ISO 14310 V0 standard upon request. The valve only closes during pumping from the tubing to annulus, and also features a contingency closing option in which the MCV can be closed with a shifting tool on wireline.