The Influence of Wellbore Inflow on Electromagnetic Borehole Flowmeter Measurements

Abstract

This paper describes a combined field, laboratory, and numerical study of electromagnetic borehole flowmeter measurements acquired without the use of a packer or skirt to block bypass flow around the flowmeter. The most significant finding is that inflow through the wellbore screen changes the ratio of flow through the flowmeter to wellbore flow. Experiments reveal up to a factor of two differences in this ratio for conditions with and without inflow through the wellbore screen. Standard practice is to assume the ratio is constant. A numerical model has been developed to simulate the effect of inflow on the flowmeter. The model is formulated using momentum conservation within the borehole and around the flowmeter. The model is embedded in the MODFLOW-2000 ground water flow code.

A Mathematical Model of the Thermo-Anemometric Flowmeter

“…The criteria for the E grille induction flowmeter are grounded. In [ 4 ] the results of an experimental study on an electromagnetic flowmeter are given. The methods for this study are described and a final result processing algorithm is proposed.…”