摘要
井口吸力桩表层建井技术在天然气水合物开采、边际油田开发、军事航道区水下开发等领域具有良好应用前景,但在井口吸力桩安装过程中存在贯入不到位导致水下井口出泥过高引发钻井工况复杂载荷下水下井口失稳难题,有必要开展极限贯入深度研究。基于井口吸力桩贯入阶段力学模型,考虑沉贯阻力和极限吸力,建立了井口吸力桩极限贯入深度模型。结合南海西部X井位工程实例,开展了井口吸力桩表层建井设计,计算了直径为6 m的井口吸力桩贯入过程中的阻力,给出了井口吸力桩极限吸力设计参数。计算结果表明:在南海西部X井位安装井口吸力桩,其极限吸力的主要限制因素为临界吸力和水泵吸力;极限贯入深度主要受土质类型和强度、临界吸力的影响,强度高和渗透性好的土体会导致极限贯入深度减小;X井位井口吸力桩极限贯入深度为26.75 m。本文极限贯入深度的计算分析可为井口吸力桩的设计和现场施工提供技术参考。
The conductor suction pile technology has promising applications in various fields such as natural gas hydrate development,marginal oilfield development,and subsea development in military channel zones.However,during the installation of conductor suction piles,there is a challenge of incomplete penetration leading to the subsea wellhead being excessively elevated above the mudline,which leads to instability under complex drilling conditions and loads.Therefore,it is necessary to conduct research on the ultimate penetration depth.Based on the mechanical model of conductor suction pile penetration stage,a ultimate penetration depth model of conductor suction pile is established,taking into account the penetration resistance and ultimate suction force.The conductor suction pile surface construction design is carried out with the background of the Well X project in the western of the South China Sea.The resistance during penetration of 6 m diameter conductor suction pile is calculated,and the design parameters of ultimate suction force of conductor suction pile are provided.The calculation results indicate that the main limiting factors for the ultimate suction force of the conductor suction pile at this wellhead X are the critical suction force and pump suction force.The ultimate penetration depth is mainly influenced by the soil type,strength and critical suction force.Soil with high strength and high permeability will cause a decrease in the ultimate penetration depth.The ultimate penetration depth of 26.75 m is obtained after calculation and analysis.The calculation of the ultimate penetration depth can provide an essential technical reference for the design and on-site construction of conductor suction piles.
作者
李舒展
杨进
朱国倞
黄熠
张珣
万宏宇
LI Shuzhan;YANG Jin;ZHU Guojing;HUANG Yi;ZHANG Xun;WAN Hongyu(School of Safety and Marine Engineering,China University of Petroleum,Beijing,Beijing 102249,China;CNOOC South China Sea Oil&Gas Energy Academician Workstation,Haikou,Hainan 570312,China;CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 524000,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2024年第2期185-194,共10页
China Offshore Oil and Gas
基金
国家自然科学基金企业创新发展联合基金重点支持项目“深水含水合物海洋土与水下桩基耦合作用及失稳机理研究(编号:U22B20126)”
国家重点研发计划项目“深水生产系统泄漏检测及应急处置技术与装备(编号:2022YFC2806100)”
国家工业和信息化部高技术船舶科研项目“水下油气生产系统全生命周期可靠性保障技术体系研究”子课题“水下油气生产系统集成可靠性研究与应用(编号:2018GXB-01-03-005)”
海南省重大科技计划项目“天然气水合物钻井关键技术研究(项目编号:ZDKJ2020011)”部分研究成果。
关键词
水下
井口吸力桩
贯入深度
极限吸力
subsea
conductor suction pile
penetration depth
ultimate suction
