This paper describes the integration of openhole well logs and memory production logging data to aid the evaluation and remediation of a horizontal well by understanding reservoir fluid contact. This paper includes a case study of the techniques used to acquire and interpret three-phase flow in a North Slope horizontal well, procedures used to remediate the well, and their results. The example well was shut in as a result of the high gas production rate and uncompetitive gas/oil ratio (GOR) shortly after completion. The production logging data acquired with memory was utilized in combination with openhole log data to refine the reservoir fluid contact estimates. A refinement of the near-wellbore fluid picture (gas/oil/water) reduced the risk involved with the various remediation options enough to proceed. The remediation action chosen was a program to add perforations. This program was economically successful and resulted in the well being placed back on production as a competitive full-time producer with substantially reduced GOR and increased oil rates. To fully evaluate the downhole flow contribution of the various zones within the reservoir, it was necessary to evaluate the three-phase flow in this horizontal well. Traditionally, this had been accomplished with coiled electric line. In the wells described in this case study, memory production sensors recorded both gas holdup (through optical probes) and distributed water holdup. These measurements allowed accurate identification of entry points of all three phases. The techniques described in this paper have wide application for remediation of horizontal wells in mature fields.
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