During a recent revisit (October 1999) to Duyong Field, Offshore Peninsular Malaysia, the operator Petronas Carigali Sdn Bhd (PCSB) was able to drill through the troublesome Terengganu Shale and successfully completed a well in the productive Tapis Gas Sands. The well, Duyong A-4 STR4D (DYA-4STR4D) was drilled and completed under approved budget with minimal lost time. DYA-4STR4D was the first 3-1/2" monobore completion by PCSB in Peninsular Malaysia, paving the way for future application of the technology especially for the development of marginal oil and gas fields. This paper will summarize the design, planning and execution of this milestone achievement for PCSB.

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