Abstract
This paper reviews application of borehole flowmeters in granular and fractured rocks. Basic data obtained in the field are the ambient flow log and the pumping-induced flow log. These basic logs may then be used to calculate other quantities of interest. The paper describes the applications of the Tennessee Valley Authority (TVA) electromagnetic (EM) flowmeter in a granular medium. In an attempt to ascertain the effect of formation disturbance on flowmeter readings, test wells were subjected to repeated periods of development using air lifting. Between the development periods, flowmeter tests were run. The results indicated that flowmeter data are not highly sensitive to formation disturbance in the near vicinity of a test well. Evidence of changes in the natural (ambient) flow in the test well was attributed to high, variable rates of pumping by nearby chemical plants. In fractured media, flowmeters may be used to detect flow to or from individual fractures or fracture zones. In these applications, additional information in the form of caliper, televiewer and resistivity logs are useful. Further studies of the type described herein are warranted.
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