摘要
陵水17-2气田开发生产平台——"深海一号"能源站,是国内首次应用钢悬链立管的深水半潜式生产平台,如何在南海恶劣海况条件下使立管满足总体强度指标和30年疲劳寿命要求是该气田采用半潜式生产平台开发模式成功实施的关键。开展了不同浮式平台和立管形式的可行性研究,论证了自由钢悬链立管回接至直角立柱深吃水半潜式生产平台开发模式的可行性。针对平台垂荡和偏移较大的问题,开展了精细化环境参数研究,波浪参数采用方向极值,风和流采用相应的条件极值,解决了大管径钢悬链立管触地段在极端海况下出现压缩的问题。基于平台储卸油特性和涡激运动显著的特点,采用不同吃水工况平台运动计算了立管强度和疲劳寿命,确保立管强度及疲劳寿命满足要求,并指出平台涡激运动和波浪对立管疲劳损伤存在较大影响,后续应重视对波浪数据、平台涡激运动监测数据以及外输立管监测数据的后评估。开展了立管泄漏对生活楼的定量风险评估,合理确定了立管布置位置,降低了立管泄漏对生活楼的损伤风险。陵水17-2气田已于2021年6月成功投产,充分说明了钢悬链立管在"深海一号"能源站的适用性,所采用的外输立管创造了同等水深半潜式平台钢悬链立管最大管径的应用记录,相关经验做法可为类似深水油气田开发工程钢悬链立管的设计提供参考。
The"Deep Sea No.1"energy station deployed for LS17-2 gas filed is the first deep water semi-submersible production platform using steel catenary riser in China.Under the severe sea conditions in the South China Sea,the key to the successful implementation of the development mode of semi-submersible production platform in the gas field is that the riser shall meet the requirements of overall strength index and 30-year fatigue life.Feasibility studies on different floating platforms and riser types are carried out,and the feasibility of the development mode of tying free steel catenary riser back to right angle column deep draft semi-submersible production platform is demonstrated.In view of the large heave and offset of the platform,refined environmental parameters are studied,and directional extremums are adopted for wave parameters and the corresponding conditional extremums are adopted for wind and flow,which solves the problem of compression in touch down zone of large-diameter steel catenary riser under extreme sea conditions.Based on the characteristics of oil storage and unloading of the platform and the remarkable characteristics of vortex induced motion,the strength and fatigue life of the riser are calculated by using the platform motion under different draft conditions to ensure that the strength and fatigue life of the riser meet the requirements.It is pointed out that vortex induced motion of the platform and waves have a great impact on the fatigue damage of the riser,and attention should be paid to the post evaluation of wave data,platform vortex induced motion monitoring data and export riser monitoring data.Quantitative risk assessment of riser leakage to the living quarter is carried out and the riser layout position is reasonably determined,reducing the damage risk of riser leakage to the living quarter.LS17-2 gas field was successfully put into production in June 2021,which fully illustrates the applicability of steel catenary riser in"Deep Sea No.1"energy station,and the adopted export riser has created an application record of the maximum diameter of steel catenary riser of semi-submersible platform in the same water depth.The relevant experience and practice can provide reference for the design of steel catenary riser in similar deep-water oil and gas field development projects.
作者
贾旭
贾鲁生
黄俊
刘毅
李达
李刚
易丛
JIA Xu;JIA Lusheng;HUANG Jun;LIU Yi;LI Da;LI Gang;YI Cong(CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第5期165-174,共10页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司综合科研项目“陵水半潜式生产平台研究专项(编号:LSZX 2020 HN 01)”
工业和信息化部“深水半潜式生产储卸油平台工程开发(编号:工信部装函【2019】360号)”部分研究成果。
关键词
陵水17-2气田
“深海一号”能源站
半潜式生产平台
钢悬链立管
立管强度
疲劳寿命
涡激运动
风险评估
LS17-2 gas filed
"Deep Sea No.1"energy station
semi-submersible production platform
steel catenary riser
riser strength
fatigue life
vortex induced motion
risk assessment
