System and methods for testing petroleum wells

Systems and methods for testing petroleum wells utilize a fluidic system to receive multiphase fluid output from the wells. A metering system measures the flow rate of oil, water, and gas through the fluidic system. The metering system can be operated in a first mode in which the metering system measures the flow rates over longer intervals of time, for example, providing measurements of the total flow or average flow rate over certain time intervals. A control system selectively and sequentially routes the output of the wells to perform a series of well tests on the wells and causes the metering system to switch between the first and second modes in response to a change in operating conditions