Adequate Fatigue Design for HPHT
- Harish Patel (ABS) | Jing Ji (ABS) | Satya Meruva (ABS) | Jessie Lin (ABS)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 1-4 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2017. Offshore Technology Conference
- 1.7 Pressure Management, 1.6 Drilling Operations, 3 Production and Well Operations, 6.3 Safety
- Independent Third Party, Fatigue Design, BSEE, I3P, HPHT, Well Control, Pressure Vessels
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- 167 since 2007
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Recent experiences with manufacturers, operators, rig contractors, and industry committees will be shared to provide a broad, high-level overview of a design concept that is new to many segments of our industry. The paper is intended to initiate further discussions while providing insights for the future design of high-pressure, high-temperature (HP/HT) equipment. Current gaps in equipment codes and design standards along with a fundamental shift in design methods have created unique challenges with a need for modification. Guidance documents available to the designers and manufacturers of HP/HT equipment are limited with respect to prescriptive requirements, and more work is required.
This paper addresses the application of the American Society of Mechanical Engineers (ASME) codes and standards, (or a functional equivalent,) for HP/HT oil field equipment in proposed subsea environments that include exposure to harsh fluids. It will also discuss what is required to adequately evaluate fatigue design concepts. Further dialogue is needed to appropriately address the concerns of regulators, manufacturers, and operators regarding the optimum method to achieve a safe fatigue-sensitive designs. The United States Bureau of Safety and Environmental Enforcement (BSEE) requirements for fatigue-sensitive applications require a detailed verification and validation of equipment designs, materials selection, and the manufacturing process.
Criticality of key components in an HP/HT system and their impact on fatigue design and safety margins for fatigue design will be discussed. In addition, suitability of using engineering codes written for pressure vessels for the design of HP/HT well control equipment will be deliberated. Restrictions on elastomers in the operating or working temperature ranges will be examined. The paper will consider whether the API codes being written currently receive adequate input to address all the appropriate failure modes and if there is sufficient levels of industry representation to define and publish new API standards. Lastly, as new regulations are developed, feasibility for companies to implement HP/HT drilling and production systems are to be discussed.
The conclusions outlined in this paper are not intended to define the HP/HT processes and procedures. The intent is to discuss the issues examined collectively and perhaps to help establish some guidelines for future considerations.
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