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Integrated-Technology Approach Enables Successful Prospect Evaluations in Malaysia

The central Luconia gas province located offshore Sarawak houses numerous carbonate reservoirs (Fig. 1). Some of these reservoirs are characterized by the presence of karsts and fractures, contributing to total mud losses. Implementing the variant of managed-pressure-drilling technology called pressurized mud-cap drilling (PMCD) allowed targeted total depths (TDs) to be reached on several wells. However, reaching TD alone is insufficient for conclusive evaluation. Integration of technology applications is paramount in increasing the success rate of data delivery.

Introduction 

Well-known for highly varying formation properties even within small sections of reservoir, the recently discovered Malaysian carbonate formations present a risk of drilling-fluid losses. Conventionally, these wells were drilled with overbalanced mud and losses were cured with lost-circulation materials (LCMs) or cement plugs to enable restoration of overbalanced condition for future drilling. Drilling a multiple total-losses zone conventionally proved to be highly uneconomical and likely to jeopardize the safety of the operation. To mitigate this inefficiency and associated safety risks, the PMCD technique was implemented and made ready for all of the operator’s carbonate drilling operations. Since 2010, PMCD equipment and personnel have been mobilized for 11 wells, but have been used only in six wells.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 164576, “Integrated-Technology Approach To Explore Carbonate Reservoirs in Malaysia Enhances PMCD Potential and Enables Successful Prospect Evaluations,” by M. Noreffendy Jayah, SPE, Intan Azian A. Aziz, SPE, Zulhilmi Drus, SPE, Thanavathy Patma Nesan, Wong Han Sze, SPE, Abdel Aziz Ali Hassan, and Pungut Luntar, Petronas, prepared for the 2013 IADC/SPE Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition, San Antonio, Texas, USA, 17–18 April. The paper has not been peer reviewed.
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Integrated-Technology Approach Enables Successful Prospect Evaluations in Malaysia

01 September 2013

Volume: 65 | Issue: 9

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