| 摘要 |
<p>Method for measuring the flow rate in a fluid flow (30), particularly a two-phase flow comprising oil, water and gas from a development well offshore. The fluid flow is shut off temporarily and transitorily by means of a valve (33), and the fluid pressure is recorded at a location (37) immediately upstream of the valve (33) from a time when the valve starts closing to a selected moment of time after the valve is fully closed, and opening the valve to reestablish the fluid flow. The fluid mass flux G is determined according to the ratio (I), where ς = fluid density, f = friction factor, d = pipe diameter, t* = a selected moment of time after closure of the valve, Δp*f is friction loss recorded at time t* and Δpa is pressure surge pressure represented by recorded pressure increase at the moment when the valve is fully closed.</p> |
