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Multiport Selector Valve MSV – New Innovative Automatic Port Leak Detection System Delivers Accurate Well Testing


 A key production measurement is the periodic well testing for both fiscal and reservoir management requirements and a key element is the use of a multiport selector valve (MSV) upstream of a multiphase flow metering (MPFM) system.
 Typically, an MSV can connect to 7-wells (total of 8 ports, one spare) where the valve isolates the flow from one of the wells and connect it to the MPFM system. The production flow of the other wells is mixed inside the valve body cavity and is directed to a common header. This process is repeated for each well to measure all wells periodically and the key requirement for the valve is absolutely no leak from all wells flow into the well port connected to the MPFM. However, leakages through the valve ports seals occur, even to new equipment, and as a result, the well measurements are inaccurate.
 An Innovative automatic port leak detection had been developed to eliminate the disadvantages of conventional multiport selector valves. Thus, preventing seal leakage, avoid valve operation when there is a leakage, inform personnel in case of a leak and replace seals in time and avoid any damage to valve internals.
 The automatic leak detection is based on exploiting the use of a multi-function seat process and pressure switches measurements. In the case some particles (physical impurities or debris) are trapped between the port seals, the automatic leak detection system will automatically perform a cleansing procedure by retracting and pushing the valve piston back to the seat port, allowing well fluid inside the valve to flush away any kind of solids. If the problem remains a leakage alarm signal can be sent to the operator desk from the valve control panel thus ensuring total integrity of the connection between the well and the metering line connected to the MPFM for accurate well test measurements.
 An accurate well test measurement using MPFM systems for multi-wells can be achieved only if there are no leakages from wells into the wells port seal being measured and this will guarantee confident measurements as wells operational benefits such as detecting valve malfunction, a substantial reduction of maintenance and major repair costs and ultimately extending the multiport port valve operational life.