Patent ID: 9200509
Filing Date: 2015-12-01
Classification: E21B,G01F,G01P

Abstract:
1. A method for determining a fluid flow rate from a fluid producing subterranean wellbore where a pump is provided to remove fluid from the wellbore, comprising the steps of: providing a mechanism for measuring a depth of a top of a column of fluid in an annulus of a subterranean wellbore; determining an annular area of at least a fluid containing portion of the wellbore as a function of depth; measuring a depth of a fluid level in the annulus over time while the pump is not operating; calculating an annular build-up flow rate; determining a standing valve leak rate; calculating a reservoir flow rate; measuring the depth of the fluid level in the annulus over time while the pump is operating; calculating an annular drawn-down flow rate; and, calculating a pump flow rate.