113Water Production Logging for the Cost Effectively Boost Declining Production


Abstract:

Production logging is one of the most important characteristics of managing oil production. It provides understanding into the type and rates of fluid flow in the reservoir which is critical to optimizing the well’s lifetime. In petroleum industry, production logging refers to a series of measurement tasks of a working well with multiphase flow such as; oil/gas, oil/water or oil/gas/water in oilfield. The problems of a successful denotation of water production, requires identification of the specific influx zones. The challenge facing in this study was to cost-effectively boost the declining production of an offshore field in Iran. The field has been prolific historically but the production has fallen by 59% recently. An extensive program of horizontal reentry drilling and work-overs to shut off water entry and recover bypassed oil was proposed. A program of PS platform logging was also carried out. This resulted in a successful shift from single to multilateral reentry wells, results in production increase ranging between 9 and 24%. A comprehensive work-over of existing wells was undertaken to shut off water entry and recover oil bypassed by the water front in the upper reservoir wells, and to recomplete the lower wells into the upper reservoir. This production enhancement campaign was conducted largely from a self-propelled, multipurpose service vessel. The results indicate that each horizontal lateral reentry hole in the drilling program would yield an average of 6000 B/D. This outcome has provided a benchmark  measuring field development performance.

Keywords: Production logging, horizontal well, PS platform, multipurpose service vessel.

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