| 摘要 |
A multi-phase flow meter, for example at a wellhead, includes a flow conduit leading from an inlet 2 to an outlet 3 and comprising a variable inlet restriction, a variable outlet restriction, a pressure sensor and a volumetric flow meter 18 such as a Doppler meter, located between the variable inlet restriction and the variable outlet restriction. The flow meter further comprises a controller adapted to receive data from the pressure sensor and the volumetric flow meter, and to adjust the variable inlet restriction and the variable outlet restriction in accordance with at least one program which causes the controller to adjust one of the variable inlet restriction and the variable outlet restriction so that the total flow restriction imposed by the two restrictions is maintained at a substantially constant level. Thus, the control arrangement can vary the flow restrictions in concert so as to control or maintain the pressures in surrounding flowlines while varying the pressure in the flow conduit between the restrictions. |
