Abstract

The West Qarun development concession is located in the Abu Gharadig basin of the Western Desert, approximately 200 km SW of Cairo City. The block comprises a gross area of 46.2 km2 and contains the producing West Qarun oil field. Oil production commenced in October 1994 from four wells with initial production rate 1200 BOPD. The field showed constant production for the last ten years before SOG acquired the concession at a level of ±500 BOPD. The cumulative oil production amounted to 6 MMSTB of 40 deg API non-sulfurous, slightly low gas-oil-ratio paraffinic crude mainly from the Abu Roash ‘G’ and Upper Bahariya reservoirs through fifteen wells.

SOG after acquiring the concession, in 2009, conducted 3D seismic survey in order to reveal the uncertainties concerning field structure and its interpretation opened new chances by indicating higher OOIP and new promising locations for drilling. The results of new drilled wells WQ-7, WQ-9, and WQ-10 proved the new interpretation and gave more confidence in the resulted figures.

The Abu Roash "G" producing sands are characterized by formation tightness. So applying of hydraulic fracturing technique to enhance the existing wells productivity showed excellent results. Also tight formations need large shut-in time to obtain accurate pressure measurements. Therefore a pilot test was conducted to study the effect of shut-in time on the pressure measurements which will be illustrated thereafter.

Based on the studies, a complete development plan was prepared and the application of the first stage resulted in increasing the production five times (from 500 to 2500 BOPD) and tripling the proven remaining reserves as well (from 6.3 MMSTB to 19.5 MMSTB).

This paper will illustrate the approaches applied for the rejuvenation of West Qarun field and emphasizes the role of reservoir characterization and reservoir management in maximizing the field value.

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