Flowmeter analysis for asymmetric wells illustrated by logs from Mokai 3

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Syms, M.C. 1984 Flowmeter analysis for asymmetric wells illustrated by logs from Mokai 3. [s.l.]: [s.n.]. Report / Geophysics Division 195 49 p

Abstract: The downhole flowmeter designed at Wairakei, New Zealand, has now been in operation for several years. Calibration data, which are used to interpret the logs, were determined experimentally using measurements made in many wells. Consistent results have been obtained, indicating that the interpretation method is valid. However for very enlarged wells, especially those of elliptical cross-section, where the downhole tool is contained to one side of the hole by gravity or slotted liner in the well, the normal calibration does not apply. In fact a theoretical calculation shows worst-case errors in flow rate of 50% result from using this calibration. Well Mokai 3 contains the most extreme example of enlarged and asymmetric well conditions encountered so far. Data taken from one 100 m length of the well indicated flowrates up to 40% less than the actual value. When cool water was injected into Mokai 3 at 7 l/s, permeable zones above 1100 m depth provided inflows of water into the well and those below this depth were outflow zones. At an injection rate of 39 l/s flow was lot to all permeable zones