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The Influence of Wellbore Inflow on Electromagnetic Borehole Flowmeter Measurements
Author(s) -
Clemo Tom,
Barrash Warren,
Reboulet Edward C.,
Johnson Timothy C.,
Leven Carsten
Publication year - 2009
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.2008.00559.x
Subject(s) - wellbore , borehole , inflow , flow measurement , geology , petroleum engineering , mechanics , geotechnical engineering , physics , oceanography
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.