Smart-Horizontal-Well Drilling and Completion for Thin-Oil-Rim Reservoirs in Malaysia

Fig. 2—Subtle balance of driving forces in oil-rim reservoirs is critical to keep the oil rim in original place.

For thin-oil-rim reservoirs, well placement, type and path, and well-completion methods, should be evaluated with close integration of key reservoir- and production-engineering considerations. This process involves maximizing reservoir-fluid contact and drainage, optimizing well productivity, and optimizing the production profile along the wellbore. Field-implementation cases in Malaysia have demonstrated that this integrated approach to horizontal wells can significantly minimize well count, enhance well performance, and improve ultimate recovery per well in thin-oil-rim reservoirs with varying reservoir complexities and uncertainties.


Development of oil-rim reservoirs in Malaysia has improved progressively through a series of reservoir-engineering studies and successful field implementations. Although typical oil-rim reservoirs are characteristically wedged between a gas cap and an underlying aquifer, they can be structurally complicated by faults and flow boundaries, featuring various dips and saddles. Oil-rim reservoirs of various sand thickness can also be stacked and compartmentalized. Aquifer support can vary from one reservoir sector to another, resulting in uneven pressure depletion and fluid-contact change. Fig. 1 shows such a vast oil-rim reservoir in peninsular Malaysia.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 17753, “Smart Horizontal-Well Drilling and Completion for Effective Development of Thin-Oil-Rim Reservoirs in Malaysia,” by Keng Seng Chan, Rahim Masoudi, Hooman Karkooti, Ridzuan Shaedin, and Mohamad B. Othman,Petronas, prepared for the 2014 International Petroleum Technology Conference, Kuala Lumpur, 10–12 December. The paper has not been peer reviewed. Copyright 2014 International Petroleum Technology Conference. Reproduced by permission.
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Smart-Horizontal-Well Drilling and Completion for Thin-Oil-Rim Reservoirs in Malaysia

01 May 2015

Volume: 67 | Issue: 5


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