Application of Subsea Structure Scouring Incipient Assessment Based on FLUENT in Indonesia Subsea Pipeline Project

Abstract

Abstract:

Many subsea pipelines have been failed during their service period caused by scouring of pipeline support structure. When a submarine pipeline or submarine structure is laid on a sediment bed, and is subject to a current, the pressure difference between the upstream and the downstream of the pipeline or the structure may induce a scour underneath the pipe and submarine structure. According to this problem, the subsea pipeline support structure scouring assessment is studied to forecast the scouring occurrence. Firstly, the sediment incipient velocity is calculated based on scouring theoretical analysis, and then a two-dimensional geometry model is built in FLUENT software, and the actual seabed current velocity is obtained based on numerical simulation by FLUENT software. Through the comparison between these two velocities, the scouring occurrence could be assessed. This method is validated in Indonesia subsea pipeline project.

Key words: subsea pipeline, FLUENT software, subsea support structure, scouring incipience, scouring assessment, numerical simulation

CLC Number:

P742

Zi-peng ZHOU, Wen-jun ZHONG, Mei-zhen ZHOU, Guo-min SUN, Le-qin WANG, Chun-hong HU. Application of Subsea Structure Scouring Incipient Assessment Based on FLUENT in Indonesia Subsea Pipeline Project[J]. Ocean Engineering Equipment and Technology, 2015, 2(1): 45-49.

Figures/Tables 8

Table 1

Table 2

Fig.3

Table 3

Fig.4

Fig.5

References 7

[1]	马良. 海底油气管道工程[M].北京:海洋出版社,1987.
[2]	吴钰骅, 金伟良, 毛根海, 等.海底输油管道底砂床冲刷机理研究[J].海洋工程,2006, 24(4):43. doi: 10.3969/j.issn.1005-9865.2006.04.008 URL
[3]	孙宁松, 孙永福, 宋玉鹏.海洋平台桩基冲刷及影响因素分析[J]. 海岸工程,2004, 23(4):38. doi: 10.3969/j.issn.1002-3682.2004.04.006 URL
[4]	Bai Y, Ng C, Shen H, et al.Rheological properties and incipient motion of cohesive sediment in the Haihe Estuary of China[J]. China Ocean Engineering, 2002, 16(4) :483-498 doi: 10.3321/j.issn:0890-5487.2002.04.005 URL
[5]	钱宁, 万兆惠.泥沙运动力学[M] . 北京: 科学出版社,2003.
[6]	孙建伟, 耿红, 孙昭晨.海底管道周围局部冲刷数值模拟分析[J]. 海洋技术,2010, 29(1):51. doi: 10.3969/j.issn.1003-2029.2010.01.011 URL
[7]	黄莹, 佘昌莲, 严仁军.海洋平台桩基的冲刷机理[J]. 船海工程,2006 (5):85.

海底管道支撑结构	支撑结构底板尺寸	支撑结构高度
混凝土支撑(3和4)	3×14	1.5
混凝土支撑(2和5)	3×9	1.2
混凝土支撑(1和6)	3×6	0.6
水泥垫块	5.2×2.05	0.18

海床地质信息	参数值
水深/m	30
中粒径值/mm	0.001
海床土壤空隙比	4.23
海流粘性系数/(cm²·s^-1)	0.01
海床土壤特征比重	2.39
海水密度/(g·cm^-3)	1.033

[1]	HUANG Fu-xiang, WU Chang-nan, LI Xiang, LI Xin-fei, LI Li-hui, YIN Bing-gang. Research on Inter-propeller Interference of Dynamic Positioning Vessel [J]. Ocean Engineering Equipment and Technology, 2019, 6(2): 536-543.
[2]	YANG Yi-fan, LI Xin, WU Bo, LI Jian-xing, SHENG Nan. Research on Resistance Performance of Drillship with Different Recessing Type Moonpools [J]. Ocean Engineering Equipment and Technology, 2019, 6(1): 470-477.
[3]	LUO Shi-yong, WANG De-jun, LIU Xiao-xia, HUANG Jun. Application of Flexible Pipe in Deepwater Subsea Pipeline [J]. Ocean Engineering Equipment and Technology, 2018, 5(增刊): 53-56.
[4]	WANG Chao. Small Groove SMAW Process Experiment Investigation in Deepwater Subsea Pipeline Welding [J]. Ocean Engineering Equipment and Technology, 2018, 5(增刊): 65-68.
[5]	WEI Xu-min, ZHANG Chuan-rong, ZHANG En-ming, GUO Hong, WU Wen-long, ZHANG Jing-ke. The Optimal Design of Conveying Frame Based on Ansys Software [J]. Ocean Engineering Equipment and Technology, 2018, 5(增刊): 149-153.
[6]	WEI Wei, WANG Xin-liang, TANG Ping-peng, CHEN Hong. Sink-Stability Analysis for the Underwater Walking & Swimming Robot [J]. Ocean Engineering Equipment and Technology, 2018, 5(增刊): 305-308.
[7]	SUN Guo-min, ZHANG Jie, Xü Zhi-hui. Damage Assessment of In-Service Subsea Pipeline [J]. Ocean Engineering Equipment and Technology, 2018, 5(6): 400-404.
[8]	XING Guang-kuo, WANG Chang-tao, WANG Feng-yun, ZHANG Mei-rong, ZHANG Peng-fei. Installation Analysis of S-Lay Pipeline End Termination [J]. Ocean Engineering Equipment and Technology, 2018, 5(2): 129-132.
[9]	WANG Meng, ZHAO Dong-yan. Strength Assessment on Corroded Subsea Pipeline Based on the Code of DNV-RP-F101 [J]. Ocean Engineering Equipment and Technology, 2017, 4(5): 276-280.
[10]	HUANG Yu, BAO Jia. Development in Deepwater Pipe Laying [J]. Ocean Engineering Equipment and Technology, 2017, 4(5): 281-286.
[11]	LIU You-li, XIONG Rui, YUAN Ju-yang, HONG Sen. Application of New Field Joint Coating Process to Subsea Pipeline Laying [J]. Ocean Engineering Equipment and Technology, 2017, 4(3): 168-172.
[12]	YANG Lian-feng, ZHANG Xiao-jian. Application of Wet Recovery Technology in the Process of Subsea Pipeline Repairing [J]. Ocean Engineering Equipment and Technology, 2016, 3(4): 217-221.
[13]	XU Shan-hui, DU Qing-gui, YIN Bao-rui, ZHUANG Hong-chang, WANG Cheng-lin. Study on the Current Force on the Columns with Different Fillet Radii of a Floating Platform [J]. Ocean Engineering Equipment and Technology, 2016, 3(2): 111-115.
[14]	CHEN Shi-wen, YANG Zhi-xun, RUAN Shi-lun, ZHOU Mao-fu, YUE Qian-jin. Dimension Sensitivity Analysis of Octagon Tank on Sloshing-Induced Slamming Load Based on Simulation [J]. Ocean Engineering Equipment and Technology, 2016, 3(1): 39-45.
[15]	JIA Zhen. Development of an Auto On-Off Pouring Mold Used in Field Joint Installation of GSPU Thermal Insulation Pipe [J]. Ocean Engineering Equipment and Technology, 2016, 3(1): 52-57.