Journal
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Volume 117, Issue -, Pages 483-497Publisher
ELSEVIER
DOI: 10.1016/j.psep.2018.05.021
Keywords
Deepwater drilling riser; Risk assessment; Fuzzy petri net; Fuzzy reasoning algorithm; Combination weighting method
Categories
Funding
- National Key Basic Research and Development Program [2015CB251203]
- Program for CHANGJIANG Scholars and Innovative Research Team in University [IRT14R58]
- Major National Science and Technology Program [2016ZX05057011]
- National High-Technology Research and Development Program of China [2013AA09A222]
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Drilling risers are the critical connection of subsea wellhead and the floating drilling unit. With exploration and development of oil and gas resources moving into deepwater, drilling riser operations have been characterized with high safety risk and occurrence rate of accidents causing high drilling downtime and drilling cost. In the present study, a Fuzzy Petri Net (FPN) methodology is proposed to evaluate the comprehensive risk of deepwater drilling risers. A risk index evaluation system was established based on analyses of drilling riser accidents and identification of risk factors, and the AHP-EM method was used to determine the weights of them. A 9-tuple set was defined to model drilling riser risks according to the FPN theories, and by using the fuzzy reasoning algorithm, risk values of risk factors at different levels and the integrated system were gained by iteration of state matrix. A specific case study of deepwater drilling risers of NANHAI-8 drilling unit in Liuhua oilfield in South China Sea is presented to illustrate the application of proposed approach, and some suggestions drawn from the investigation are presented to further mitigate the risk of drilling riser operations. The case study showed that FPN is a practical and reliable method in comprehensive risk evaluation of deepwater drilling riser system. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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