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Abstract

This paper illustrates an example of integrated multi-disciplinary approach in planning an infill well to drain the oil in the 1-10 reservoir in the Central fault Block of Guntong field. The 1-10 is one of the major reservoirs in the EMEPMI-operated Guntong Field in the Malay basin. The 1-10 consists of low to high energy tidal deposits in the form of subtidal bars and flats. The reservoir is driven mainly by water injection, with occasional gas injection updip. A 3D geologic model has been built and upscaled for simulation in 2001. The well was planned to be a very high angle well that is strata-parallel to the reservoir. The challenge was to stay within 4-5 m from the top of 1-10 for approximately 500 m to target the best part of this reservoir. The main risks associated with the <br>well were the location of the injected water front, the possibility and extent of gas streaking down through the high permeability layers ane reservoir quality at the heel section of the well. An integrated team consisting of geoscientists, a reservoir engineer and a drilling engineer worked closely to optimise the location and well design. Seismic impedence, AVO respose and time-lapse analysis were integrated with sequence stratigraphy, production performance data and reservoir simulation to finalize the target location and to fully describe this infill opportunity, inculding the associated risks. Several iterations and scenarios were developed to choose the best location to ensure the well is economically robust. A process chart was also developed collectively to lay down the plans while drilling, including fallback actions. Communication among the multi-disciplinary well planning team and the field personnel were also vital in ensuring that all parties were aware of the drilling plans. The well was successfully drilled in May 2004 and encountered oil in 1-10 reservoir with minor gas streaks. Total net completion length is about 400MD and the well flows at about 10000 b/d of oil.

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/content/papers/10.3997/2214-4609-pdb.259.17
2004-12-15
2024-03-28
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