Managing Structural Integrity for Ageing Platform
- Nigel Wayne Nichols (Petronas Carigali Sdn Bhd) | T.K. Goh (Petronas Research & Scientific Services Sdn Bhd) | Hazlan Bahar (Petronas Carigali Sdn Bhd)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil & Gas Conference and Exhibition, 11-13 September, Adelaide, Australia
- Publication Date
- Document Type
- Conference Paper
- 2006. Society of Petroleum Engineers
- 5.1.5 Geologic Modeling, 3 Production and Well Operations, 4.6 Natural Gas, 4.5 Offshore Facilities and Subsea Systems, 4.2.3 Materials and Corrosion, 2.4.3 Sand/Solids Control, 4.3.4 Scale
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Petronas Carigali Sdn Bhd (PCSB) is currently operating in excess of 150 Platforms. Of these over 60% have been in operation for more than 20yrs, 20% of platforms have already exceeded 30yrs with several others in the very near future reaching their initial design life (20-25yrs).
Increasing demand to extend the life of these platforms due to further oil/gas discoveries can result in the platform being subjected to higher loading due to required modifications/ upgrading and work-over demands for which the platform may not have been originally designed for. Furthermore, the need to undertake more frequent detail inspections due to long-term fatigue phenomena also requires managing.
In addition to the above PCSB platforms may also be faced with other challenges/events such as more onerous code requirements, increase in environmental metocean loading, presence of shallow gas and seismic/earthquake loading for which again the structure may have not been initially designed for. As such PCSB must be able to manage these events and justify the on going integrity and fitness for purpose of its platforms.
This paper describes the challenges and solutions faced in managing the ongoing long-term structural integrity of its ageing platforms. Several key assessment procedures, tools and technology initiative improvement programs will be covered in detailed to highlight their importance in managing the long-term integrity of the structures. In addition the implementation of such assessment procedures, tools and technology improvements are being used to assist in the ongoing development of a Carigali Structural Integrity Management System (CSIMS). The process adopted (as described in this paper) is to be inline with the recent development of a standalone Recommended Practice (RP) API RP 2SIM, for the Structural Integrity Management of existing structures (currently applicable to Gulf of Mexico), to extend its applicability to Non-US Waters. As such PCSB has recently joined a JIP (Joint Industry Project) initiative involving a number of Non-US Oil/Gas Operators to extend the applicability of the RP 2SIM to Non-US Waters.
Petronas Carigali SND BHD (PCSB) currently operates in the domestic waters of Malaysia namely Penisular Malaysia Operations (PMO), Sarawak Operations (SKO) and Sabah Operations (SBO) over 150 Platforms respectively. The number of facilities for each of the regions by platform operation years is shown in Table 1. It can be seen from Table 1 that several of these platforms have been in operation for more than their original intended design life of 20/25 yrs and 20% have been operating beyond 30 yrs. In particular the largest number of facilities and oldest platforms are located in SKO region as shown in Fig. 1 with over 50% greater than 25yrs and 30% exceeding 30yrs.
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