| 主权项 |
1. A multi-phase flow meter having a flow conduit leading from an inlet to an outlet and comprising:
a variable inlet restriction and a variable outlet restriction for controlling the flow of fluid from the inlet, through the inlet restriction and then through the outlet restriction and to exit the multi-phase flow meter from the outlet, a pressure sensor and a flow meter, located between the variable inlet restriction and the variable outlet restriction, the flow meter further comprising a controller adapted to receive data from the pressure sensor and the flow meter, and to adjust the variable inlet restriction and the variable outlet restriction in accordance with at least one program; wherein in accordance with the at least one program the controller is arranged to adjust one of the variable inlet restriction and the variable outlet restriction such that the fluid pressure between them adopts a first pressure, then to further adjust the restriction such that the fluid pressure between the restrictions adopts a second and different pressure, and to record the first pressure, the second pressure, and the fluid flow rates at the first pressure and at the second pressure; whilst adjusting the other of the variable inlet restriction and the variable outlet restriction so that the total flow restriction imposed by the inlet and outlet restrictions is maintained at a substantially constant level. |
