The Influence of Wellbore Inflow on Electromagnetic Borehole Flowmeter Measurements |
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| Authors: | by Tom Clemo Warren Barrash Edward C Reboulet Timothy C Johnson Carsten Leven |
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| Institution: | Center for the Investigation of the Shallow Subsurface, Boise State University, 1910 University Dr., Boise, ID 83725-1536;Kansas Geological Survey, 1930 Constant Ave., Lawrence, KS 66047-3726;Idaho National Laboratory, P.O. Box 1625, Idaho Falls, ID 83415-2107;The Helmholtz Centre for Environmental Research—UFZ, Permoserstraße 15, 04318 Leipzig, Germany |
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| 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. |
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