海洋双井口吸力桩井口间距设计方法  

Design method for the spacing between the suction piles at the double well mouth of the ocean

作　　者：罗鸣 刘书杰 李文拓 李清平 周思琦 曾春珉 Luo Ming;Liu Shujie;Li Wentuo;Li Qingping;Zhou Siqi;Zeng Chunmin(CNOOC Hainan Energy Co.,Ltd,Haikou 570100;CNOOC Research Institute Co.,Ltd,Beijing 100028;Hainan Branch of CNOOC(China)Co.,Ltd,Haikou 570100;Hainan Province key Laboratory of Deep Sea Energy Engineering,Haikou 570100)

机构地区：[1]中海油海南能源有限公司,海南海口570100 [2]中海油研究总院有限责任公司,北京100028 [3]中海石油(中国)有限公司海南分公司,海南海口570100 [4]海南省深海深层能源工程重点实验室,海南海口570100

出　　处：《石化技术》2024年第11期127-129,共3页Petrochemical Industry Technology

基　　金：国家重点研发计划课题“多气合采复杂结构井钻井技术及装备”(课题编号:2021YFC2800904)。

摘　　要：海洋双井口吸力桩作为一种海上钻井结构,其井筒对称分布于桩体中轴线两侧。在钻完井及后续测试作业中,由于一侧井口承载较大的载荷,导致对吸力桩基础产生偏心载荷作用,影响结构稳定性。基于目标靶区土质情况及井口载荷,对外径为2~4 m的双井口吸力桩井口间距进行了设计分析。通过倾覆失稳理论,考虑了小位移失稳和大位移倾覆两种失稳模式,分析了环境载荷对结构稳定性的影响,并根据API相关规范选取了环境参数和安全系数。通过参数敏感性分析,确定了桩体高度、贯入深度和井口间距对倾覆性能的影响,并推荐了设计井间距为3.5 m,以确保结构的稳定性和防止井口设备互相干涉。The ocean dual-borehole suction pile,with its boreholes symmetrically distributed on both sides of the pile's central axis,is subject to significant eccentric load effects during the drilling and subsequent testing operations due to the asymmetrical loading of one borehole.This study,based on the soil conditions of the target area and borehole loading,conducts a design analysis of the dual-borehole suction pile’s borehole spacing,specifically for an outer diameter of 2~4 meters.By applying the overturning instability theory,which encompasses two modes of instability—small displacement instability and large displacement overturning—the study examines the impact of environmental loads on structural stability.Environmental parameters and safety factors are selected in accordance with API standards.A sensitivity analysis of the pile Height,penetration depth,and borehole spacing parameters is performed to determine their effects on the pile’s overturning performance.The study recommends a borehole spacing of 3.5 meters to ensure structural stability and prevent interference between borehole equipment.

关 键 词：井口吸力桩 井口间距 倾覆失稳 环境载荷 参数敏感性性 

分 类 号：TE52[石油与天然气工程—油气田开发工程]