Research on Key Technical Issues of Bundle Submarine Cables for Marginal Oilfield Development

doi:10.11985/2021.01.018

Abstract

Abstract:

With the in-depth development of the Bohai Oilfield, the proportion of marginal oilfield development projects has gradually increased. More and more marginal oilfields with low productivity and poor efficiency need to be put in service. The use of frequency converters to remotely control submarine wellhead electric submersible pumps is an effective way to upgrade the yield and adapt to the annual production allocation. It is necessary for marginal oilfields to build a new platform to control the power transmission of several surrounding wellheads due to their large dispersion ranges and long distances. The traditional three-core submarine cable connecting the supporting platform and the newly built platform can no longer meet the variable frequency drive requirements among the wellheads. At present, the commissioning of the multi-core wet structure bundle submarine cable is an effective way to realize the application of unmanned platforms, concentrate on the development of multiple oil wells, reduce construction costs, and decrease environmental pollution. The feasibility of localization of bundle submarine cables in terms of system composition, key technologies and solutions, accessory design, production technology and comprehensive testing are elaborated, and suggestions and considerations are proposed for the wider application of bundle submarine cables in offshore oil and gas development in the future.

Key words: Marginal oilfields, bundle submarine cable, noise emissions, TR-XLPE, voltage reflection

CLC Number:

TM247

JIN Qiu, DAI Guohua, WANG Wanxu, CHEN Fengbo, GAO Yang, WANG Haitao. Research on Key Technical Issues of Bundle Submarine Cables for Marginal Oilfield Development[J]. Journal of Electrical Engineering, 2021, 16(1): 141-148.

Figures/Tables 10

References 19

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项目	分相铅套	单回路统包铅套	湿式结构
外径/mm	180	155	154
空气中重量/(kg/m)	71.0	46.0	34.5
轴向刚度/MN	501	450	431
弯曲刚度/(kN·m²)	17.2	11.0	7.5
扭转刚度/(kN·m²)	175	147	117
最小弯曲半径/mm	3 600	3 100	3 000
最小破断力/kN	1 100	950	900
安全工作载荷/kN	650	450	380

序号	测试项目	测试目的
1	成缆试验	验证生产工艺可行性,设备适用性,生产流转通道是否可行
2	拉伸扭转平衡测试	两端旋转固定拉伸：提取拉伸刚度;一端旋转固定,一端自由拉伸：提取扭转刚度;提取集束海缆拉伸过程中自旋角度;验证集束海缆的安全工作载荷和破断力。评价指标还包含电性能和光性能变化
3	弯曲刚度测试	提取集束海缆在层间黏滞/滑移状态下的弯曲刚度值
4	终端强度测试	验证集束海缆锚固与缆本体连接强度和长期加载下蠕变效应
5	拉伸弯曲组合测试	验证集束海缆在指定轴向拉力作用,过小弯曲半径滑轮后性能变化,通常测试导体电阻、绝缘电阻和光纤衰减
6	集束海缆紧握/挤压测试	测试技术海缆在四相和两相压板挤压下,外径变化,并提取极限承载能力。评价指标还包含电性能和光性能变化。压板可根据使用设备进行材料和外形选型
7	内外摩擦因数评估	测试集束海缆在不同侧向挤压力作用下,压板和外护层,铠装层和内护层之间的摩擦因数
8	集束海缆冲击测试	验证集束海缆在不同冲击物撞击下的承载能力,测试地基包括砂石地质和坚硬地质。评价指标还包含电性能和光性能变化
9	自由溢流测试	验证集束海缆内护套内部,缆芯之间缝隙在不同水压力作用下的流速变化
10	全尺寸疲劳测试	验证动态海缆在长期动态疲劳载荷作用,功能单元和防护层的承载能力。载荷施加形式为拉-弯组合,测试次数为150万~200万次,测试周期通常为3~4个月
11	出厂验收测试(FAT)	测试集束海缆在发货状态下的电气和光纤衰减变化。发货状态包括存储在铁盘和托盘内