Preliminary Investigation on Monitoring Methods for Deepwater Risers
Bao-jun LI1, Xin DENG2, Xiao-hong SHEN1, Ni LI2, Ke HE1, Zhe JIANG1, Hai-yan WANG1
1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China 2. Survey & Design Company, CONHW, Zhanjiang, Guangdong 524057, China
Marine riser is the key but the most brittle assembly in deepwater oil exploration and production. The fatigue and fracture accident of deepwater risers, which are caused by factors such as vortex-induced vibration(VIV), offset of platform and so on, not only lead to huge economic loss, but also bring out marine ecological disaster and even create international political problems. The deepwater riser monitoring technology, starting from the fatigue and fracture accident the risers encountered, is the important guaranty for them to run safely during service and plays a vital role in the evaluation of structural fatigue damage and early warning of fracture accident. The advanced fatigue monitoring technologies are required urgently to meet the new journey of deepwater exploration and production industry that our country has embarked on. The why and how on fatigue monitoring of deep water riser is reviewed. The key parameters to monitor, the detecting methods and the manners of data transmission for their fatigue monitoring are introduced, and more attention is paid to the latter two. At last, the states of the art of fatigue monitoring methods in China and the test in South China Sea are discussed. Some suggestions on deepwater riser monitoring are given to support exploration and operation of deepwater oil and gas industry in a safe and environmentally responsible manner.
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