蒸汽热采水平井管柱受力稳定性分析研究
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摘要
针对热采管柱设计时未充分考虑作业过程中管柱的受力变化的情况,考虑蒸汽热采井井下复杂工况,研究复杂约束条件对完井管柱的稳定性影响。推导并建立复杂约束条件下管柱受力计算模型,以实际热采水平井B05-P2井为例,分析井身结构、高温蒸汽注入等复杂工况对完井管柱的稳定性影响。结果表明,管柱下入过程井身弯曲段对管柱受力状态影响最大;注蒸汽阶段套管柱因热胀效应产生的位移无法释放,易引起水平段破坏,失效形式主要是失稳破坏;将现场所用补偿距离与理论所需最小补偿能力对比,证实该约束条件下管柱受力分析方法具有良好的适用性,建议在完井时根据实际工况增加适当规格的补偿器或预留部分空间。
Considering the complex conditions in the thermal production wells with steam injection and the stress variation of the casing strings during the operation which is not fully taken into account in strings design,a study on mechanical stability of strings with complex constraints in well completion was conducted. A stress computing model for the strings under the complex constraints was deduced and built. Making the real horizontal-thermal well B05-P2 as an example,the effects of the intricate conditions including well structure and high temperature steam on the stability of the pipe string were studied. The results show that the the bending section of well B05-P2 effects the stresses of the strings most significantly in the well completion process. The displacements of the casing string due to the thermal expansion effect can not be released,resulting in instability of the horizontal section of the casing strings.As a result,the horizontal section of the casing string is more likely to fail in the form of bucking failure. By comparing the compensated distance used in filed with the theoretical minimum compensated capacity,the well applicability of the method proposed in this paper was proved. It is suggested to increasing some appropriate compensators or reserving some distance in the well completion process.
Considering the complex conditions in the thermal production wells with steam injection and the stress variation of the casing strings during the operation which is not fully taken into account in strings design,a study on mechanical stability of strings with complex constraints in well completion was conducted. A stress computing model for the strings under the complex constraints was deduced and built. Making the real horizontal-thermal well B05-P2 as an example,the effects of the intricate conditions including well structure and high temperature steam on the stability of the pipe string were studied. The results show that the the bending section of well B05-P2 effects the stresses of the strings most significantly in the well completion process. The displacements of the casing string due to the thermal expansion effect can not be released,resulting in instability of the horizontal section of the casing strings.As a result,the horizontal section of the casing string is more likely to fail in the form of bucking failure. By comparing the compensated distance used in filed with the theoretical minimum compensated capacity,the well applicability of the method proposed in this paper was proved. It is suggested to increasing some appropriate compensators or reserving some distance in the well completion process.
引文
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[13]闫相祯,杨恒林,杨秀娟.泥岩蠕变导致套管变形损坏机理分析[J].钻采工艺,2003,26(3):65-68.
[14]宋根才.复杂井况水平井套管损坏机理及预防技术研究[D].中国石油大学,2010.
[15]李子丰,李敬元,马兴瑞,黄文虎.油气井杆管柱动力学基本方程及应用[J].石油学报,1999,(3):95-98+7-8.
[16]姜士湖,闫相祯,张玉兰.侧钻水平井完井管柱及配套工具研究[J].石油矿场机械,2003,32(5):10-12.
[17]闫怡飞,等.CO2和H2S共存酸性环境OCTG材料选用研究[J].中国石油大学学报(自然科学版),2015,39(4):159-164.
[2]杨沛鑫,刘强,李彦龙,姜歌.热采水平井复合筛管热应力及变形规律分析[J].石油机械,2016,(3):93-97.
[3]M E Chenevert,C Gatlin.Mechanical anisotropies of laminated sedimentary rocks[J].SPE Journal,1965,5(1):67-77.
[4]B S Aadnoy.Modeling of the stability of highly inclined boreholes in anisotropic rock formations[J].SPE Drilling Engineering,1988,3(3):259-268.
[5]M B Dusseault,K E Gray.Mechanisms of stress-induced wellbore damage[C].1992 SPE International.1992:SPE 23825.
[6]米寿荣,李振坤,张兴光,周红贵.稠油热采井套管HYP110H的开发[J].中国石油和化工标准与质量,2013,(11):171-172.
[7]S Ong,J C Roegiers.Fracture initiation from inclined wellbores in anisotropic formations[C].1995 SPE International,1995:SPE 29993
[8]郭黎明.长春岭热采产出稠油乳状液稳定性及失稳研究[C].中国化学会.中国化学会第十二届胶体与界面化学会议论文
[9]李子丰.内外压力对油井管柱等效轴向力及稳定性的影响[J].中国石油大学学报(自然科学版),2011,35(1):65-67.
[10]杨沛鑫,刘强,李彦龙,姜歌.热采水平井复合筛管热应力及变形规律分析[J].石油机械,2016,44(03):93-97.
[11]P D Patillo.Efect of Non-Uniform Loading on Conventional Casing Collapse Resistance.SPE/IADC79871-PA.
[12]李彦龙,董长银,阿雪庆,陈新安,张清华,许拓拓.热采水平井近井地应力分布及影响因素分析[J].石油天然气学报,2014,(11):168-173,10.
[13]闫相祯,杨恒林,杨秀娟.泥岩蠕变导致套管变形损坏机理分析[J].钻采工艺,2003,26(3):65-68.
[14]宋根才.复杂井况水平井套管损坏机理及预防技术研究[D].中国石油大学,2010.
[15]李子丰,李敬元,马兴瑞,黄文虎.油气井杆管柱动力学基本方程及应用[J].石油学报,1999,(3):95-98+7-8.
[16]姜士湖,闫相祯,张玉兰.侧钻水平井完井管柱及配套工具研究[J].石油矿场机械,2003,32(5):10-12.
[17]闫怡飞,等.CO2和H2S共存酸性环境OCTG材料选用研究[J].中国石油大学学报(自然科学版),2015,39(4):159-164.