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Abstract
Two successful field tests of streaming potential measurements in oil fields have been carried out: one in a horizontal oil production well and one in a vertical water injection well. Pressure transients were created and the streaming potentials generated by these transients were measured by arrays of permanent electrodes placed in the boreholes. The electrodes are partially insulated from the other completion components but nonetheless record high signal-to-noise ratio responses. These field experiments have demonstrated that the streaming potentials arising from pressure transients can be measured accurately under borehole conditions. Numerical methods have been developed to interpret these measurements to offer distributed characterization of matrix permeability at various depths of investigation and effective fracture transmissibility.
While streaming potentials have been observed in many laboratory rock experiments, we believe these are the first streaming potential transients to be measured in an oil field. The field experiment results, together with forward and inverse modeling studies, indicate many possible applications of transient streaming potentials in oil and gas fields for reservoir characterization and reservoir monitoring.
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