自升式平台桩腿强度对弦管间距敏感性分析  

Sensitivity of self-elevating unit leg strength to different chord space

作　　者：朱亚洲[1] 孙承猛 张晓宇 戚欣 秦洪德[1] 姜滨[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院 [2]中国石油集团渤海装备辽河重工有限公司

出　　处：《石油勘探与开发》2015年第5期656-661,共6页Petroleum Exploration and Development

基　　金：中国石油装备制造分公司科技统筹项目"CP-375自升式钻井平台设计及关键部件研制"(Y-14M000003)

摘　　要：以自升式平台桁架式桩腿结构形式优化为目标,进行了桩腿强度对弦管间距敏感性分析,给出了桩腿弦管间距优选值。分析平台所受环境载荷,通过风洞实验获取风暴条件下风载荷数据,通过理论计算得到波浪载荷和海流载荷数据。通过特征值分析得到平台自振周期和一阶偏移值,进而获取计及水动力放大效应的惯性载荷和计及几何非线性效应的惯性矩,分析发现:波流角一定的情况下,计及水动力放大效应的惯性载荷对弦管间距较敏感,随着弦管间距增大基本呈递减趋势;随着弦管间距增大,计及几何非线性效应的惯性矩减小。结合环境载荷计算结果,对不同弦管间距下的桩腿各结构进行了强度校核,对比了各结构强度对弦管间距的敏感性,在此基础上给出了所研究的3种作业水深平台的桩腿弦管间距优选值。Aiming to optimize the truss leg structure of self-elevating unit, the sensitivity of leg strength to different chord space was analyzed, and the optimal value of chord space for legs was presented. The wind load under storm condition was obtained by wind tunnel test, and the wave and current loads were calculated based on theoretical and numerical methods. The natural vibration period and first order offset value were obtained by eigenvalue analysis, thus the inertial load considering the dynamic amplification factor and the inertial moment considering the geometric nonlinearity were obtained. It is found out through analysis that： the inertial load considering the dynamic amplification factor is more sensitive to chord space under a certain wave and current angle, and decreases with the increase of chord space in general; the inertial moment considering the geometric nonlinearity also decreases with the increase of chord space. According to the environment load, the strength of leg structures at different chord spaces were checked and the sensitivity of the strucatre strength to chord space was compared. Based on this, the optimal values of chord space for legs at three water depths were presented.

关 键 词：自升式平台 环境载荷 桩腿强度 弦管间距 

分 类 号：TE53[石油与天然气工程—油气田开发工程]