Abstract

Abstract A key factor in managing mature fields is to identify adequate surveillance in each phase of its life. The complexity increases when the field is developed with horizontal wells. Differences in data quality and resolution should be taken into consideration when planning such surveillance. Current uncertainties in Harding relate to unreliable well conformance data using conventional production logs and assumptions in the reservoir description which are sub seismic resolution. We describe the learning from a horizontal well in the Harding Field, where appropriate surveillance enhanced reservoir understanding and quality of decision making. Based on the initial understanding from the reservoir model, an insert string well work option was proposed to reduce water cut. Historically in this field, conventional production logging provided unreliable well conformance data in horizontal multiphase flow. To improve the characterization at the well scale, an array production log was deployed for the first time on this field. The flowing results revealed that the insert string solution was inappropriate and would result in lost oil production. The shut in data identified cross flow between two zones separated by a shale section. In the initial model this shale was mapped only at local level. Post surveillance it was remapped on seismic as an extensive baffle having an impact on an area with more mobile oil to recover. There is potential upside with a new infill target being identified towards the toe of this well. Most of the initial decisions about the insert string were based on seismic and modeling work. The new array production log data brought additional information into the model increasing confidence in the results. Data resolution at the well level matters and this highlights the need to take more production log measurements to calibrate the seismic response and improve the reservoir model.

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