A Thermal Study of the Subsea Bundled Pipelines for Offshore Marginal Oilfields
- Wenguang Wang (Tianjin Branch of CNOOC Ltd.) | Yufei Wan (Tianjin Branch of CNOOC Ltd.) | Ming Hao (Tianjin Branch of CNOOC Ltd.) | Zhaoguang Qu (Tianjin Branch of CNOOC Ltd.) | Xin Qian (Tianjin Branch of CNOOC Ltd.)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- marginal oilfield, shutdown, heat transfer, thermal calculation, bundled pipeline
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- 31 since 2007
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Simplified unmanned platforms are commonly used to develop offshore marginal oilfields, which are unable to be developed profitably by conventional technology and platform. Diesel, water or chemicals needed on the unmanned platform can be transported from nearby manned platforms by subsea pipelines. However, these pipelines are normally small-sized, which is unstable on the seabed. Besides, laying the pipe individually will increase the cost. The subsea bundled- pipeline is a good solution to these problems. A set of bundled pipelines in the Bohai Bay of China is studied in this paper. Different conditions such as normally running, shutdown and blending water are simulated. The temperatures of the fluid and the surrounding soil under these conditions are calculated. The thermal feature of subsea bundled pipelines is summarized, which is of significance to the development of offshore marginal oilfield, especially for high condensation point or high viscosity crude oil.
Simplified unmanned platforms are commonly used to develop offshore marginal oilfields in Bohai Bay of China (Qu, Wang and Ding, 2007; Han, Yu and Liu, 2011; Du, Yu and Tan, 2010). Crude oil treatment, utilities and electricity of the unmanned platform should depend on the nearby oilfields or platforms because of the simpler process and structure of these platforms. Thus, utilities such as diesel, water and chemicals are transported by subsea pipeline from the depended platform, rather than being stored on the unmanned platform (Xie, Tan and Wang, 2017; Yue, Lu and Du, 1998). However, the diameters of these pipe are normally small, which means it is uneconomical to lay them separately. Besides, the small-sized pipe without additional layers is unstable in the subsea circumstance.
Bundled pipeline that main pipe and secondary pipe are tied together is a good solution to the problem. Bundled pipes are laid simultaneously which can enhance the stability of the small-sized pipe and reduce the construction period and cost. With bundled pipe, less equipment is needed on the unmanned platform, the scale and the investment of the platform can be reduced.
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