DeepStar Accomplishments in Continued-Service Realm
- Chris Carpenter (JPT Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 2018
- Document Type
- Journal Paper
- 51 - 53
- 2017. Offshore Technology Conference
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- 20 since 2007
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 27840, “Collective Summary of DeepStar Accomplishments Within Continued Service,” by Joseph Gomes, DeepStar, and Greg Kusinski, Chevron, prepared for the 2017 Offshore Technology Conference, Houston, 1–4 May. The paper has not been peer reviewed. Copyright 2017 Offshore Technology Conference. Reproduced by permission.
Offshore operators must grapple with ways to keep aging floating facilities on station beyond their original design life. DeepStar is an operator-funded research-and-development joint-industry consortium that includes members of the oil community such as oil and gas companies, vendors, regulators, and academic and research institutes working in multidisciplinary technology areas. The complete paper highlights successes of the consortium in the realm of continuous service.
Mooring-Integrity Management (MIM)
Moorings on floating production systems (FPSs) are safety-critical systems, but recent research indicates that there is an imbalance between the critical nature of mooring systems and the attention that they receive. Although they are meticulously engineered against a considerable array of known factors that could accelerate standard wear and tear, there have been numerous underlying causes of mooring-system failures historically. In addition to the complex technical consequences of a mooring-leg failure, one must consider the significant financial burdens posed by support, replacement-part, and lost-production costs. Because mooring systems are designed for a single-leg-failure scenario, production might be limited by reduced operating conditions while replacement mooring-leg components are procured, and any subsequent or concurrent shutdown period might affect production negatively while the repairs are made. Should the mooring-leg failure occur at a key structural connection of the mooring leg to the floating unit, then the repairs can be compounded further and, in some instances, might require removal of the system from the field.
After this issue was brought to the consortium committee’s attention, the riser-integrity-management (RIM) project was initiated, with the primary goal of developing MIM guidelines for permanent mooring systems. These guidelines are intended to serve as the foundation for future work within the industry for risk-based inspection planning for mooring systems.
A more-comprehensive, risk-based design of an MIM program can improve the safety performance of an operating asset significantly, with the added benefit of extending the longevity of its use as practically as possible while in the field. At the same time, application of a risk-based inspection program can be used to reduce costs further by targeting inspection activities to high-risk areas or components, acting as an early-warning sys-tem through early detection of changes that precede line failure.
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