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深水钻井送入管柱的载荷计算与强度分析
管志川, 李敬皎, 韩超, 张波, 赵效锋, 腾学清, 孙宝江1,2
1. 中国石油大学石油工程学院, 山东青岛 266580;2. 中国石油塔里木油田分公司油气工程研究院, 新疆库尔勒 841000
摘要:
在海底浅部地层导管段和表层套管段的深水钻井过程中,裸露在海水中的送入管柱承受各种复杂载荷,有失效的风险。基于Euler-Bernoulli梁理论,建立无隔水管环境下送入管柱的准静态载荷计算模型,应用加权余量法进行求解,分析海洋环境载荷、钻井船偏移运动及底部套管柱重力等因素对送入管柱受力、变形和强度安全的影响。结果表明:海流载荷对管柱横向变形作用显著,波浪载荷对管柱顶部弯矩有较大影响;底部套管柱重力是影响送入管柱强度设计的关键因素;在不同作业阶段,钻井船适当的负向偏移有助于导管垂直安装,而钻井船适当的正向偏移能有效减小管柱顶部弯矩;由于弯曲正应力造成Mises应力在管柱顶部和底部出现突增,可基于轴向复合应力进行送入管柱的强度设计,并给出了管柱结构优化方案。
关键词:  深水钻井  送入管柱  准静态分析  载荷计算  强度分析
DOI:10.3969/j.issn.1673-5005.2018.02.008
分类号:TE21
基金项目:国家自然科学基金项目(51574275);教育创新团队发展计划项目(IRT_14R58)
Loads calculation and strength analysis of landing string during deepwater drilling
GUAN Zhichuan, LI Jingjiao, HAN Chao, ZHANG Bo, ZHAO Xiaofeng, TENG Xueqing, SUN Baojiang1,2
1. School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2. Research Institute of Oil and Gas Engineering, Tarim Oilfield, PetroChina, Korla 841000, China
Abstract:
In conductor and casing running operations during deepwater drilling, the exposed landing string in seawater can object very complicated loads with a risk of failure. A quasi-static mechanical model of the landing string in deepwater drilling without risers was established based on the Euler-Bernoulli theory. It was solved by a weighted residual method to analyze the effects of marine environmental loads, drilling vessel offset movement and the weight of casing strings on the deformation and strength safety of the landing string. The research results demonstrate that ocean currents and waves have a great effect on the lateral deformation and top bending moment of the landing string. The weight of the casing strings is a key factor on the strength design of the landing string. In different operations, the drilling vessel offset towards the negative direction of the ocean current is beneficial to the vertical jetting operation of the conductor, and the vessel offset towards the positive direction of the ocean current can decrease the top bending moment of the landing string efficiently. The Mises stresses at the top and bottom of the landing string can increase suddenly due to the effect of bending normal stress. A strength design method of the landing string based on the axial composite stress is proposed.
Key words:  deepwater drilling  landing string  quasi-static analysis  loads calculation  strength analysis
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