Patent ID: 8061219
Filing Date: 2011-11-22
Classification: E21B,G01F

Abstract:
1. A flow rate device for measuring the flow rate of a fluid flowing through a wellbore, the flow rate device comprising: a differential pressure conduit locatable in the wellbore, the differential pressure conduit defining an internal bore and adapted to include a restriction to increase the velocity of fluid flowing through the differential pressure conduit to create a differential pressure, the differential pressure conduit defining first and second pressure measuring stations axially spaced along the differential pressure conduit, the restriction having a cross-sectional area; a flow restrictor insert located in the restriction to reduce the cross-sectional area of the restriction, the flow restrictor insert defining an internal bore having a cross-sectional area less than the cross-sectional area of the restriction, the flow restrictor insert having a pressure measuring port aligned with the second pressure measuring station; and a differential pressure measurement device having at least one pressure sensor for detecting the pressure at the first pressure station, and detecting the pressure at the second pressure station to generate a signal indicative of the flow rate of the fluid.