Predicted Flow

Gilbert & linear methods for predicting mass flowrate

This standard calculates the correlation of critical flow through a choke to predict liquid flowrates.

Gilbert Method


Symbol Description Units
Q Gross liquid rate bbl/day
A Gilbert Constant A : 0.1 -
B Gilbert Constant B : 1.89 -
C Gilbert Constant C : 0.546 -
PWH Pressure at the well head psi g
GLR Gas to liquid ratio MSCF/STB
S Maximum choke size (1/64)Inch

Linear Method


Symbol Description Units
Q Predicted mass flowrate kg/h
QPrev Previous mass flowrate kg/h
CPCurr Current choke position %
CPPrev Previous choke position %