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Well logging apparatus with pad-mounted vertical electrode array for measuring the resistivity of the flushed zone
Well logging apparatus with pad-mounted vertical electrode array for measuring the resistivity of the flushed zone
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机译:具有垫式垂直电极阵列的测井设备,用于测量冲洗区的电阻率
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摘要
In accordance with an illustrative embodiment of the present invention, a well logging apparatus uses a narrow wall-engaging pad equipped with an array of long vertical electrodes. The width of the pad is between 2 and 4 inches, and the length-to-width ratio of the array is between 3 and 5. Circuits are connected to the electrodes for propagating a focused current primarily through the zone of the adjacent formation likely to be flushed by the borehole fluid. This current and the associated potential difference are measured to produce a signal representative of the resistivity of the flushed zone.
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