轴向约束非均匀载荷下蒸汽热采井套管屈曲研究
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摘要
针对蒸汽热采井套管屈曲失稳,从材料、套管服役特征角度,采用室内试验和数值模拟,研究了轴向约束非均匀载荷下套管屈曲机理。四十臂井径仪、水泥胶结/密度仪测井结果表明:3轮次注-采作业后,固井质量合格的套管柱结构完整,固井质量不合格的套管柱局部屈曲变形。室内试验表明:注-采作业过程套管材料表现出应变强化、应力松弛及低周疲劳,服役套管处于热弹-塑性应力状态。基于能量原理的有限元数值模拟结果证实,套管-水泥环第一界面横向位移是套管屈曲变形的主要原因。
The mechanism of casing buckling was studied in view of service behavior for both material and casing using laboratory test and numerical simulation,which aimed at structural instability due to casing buckling for steam thermal well. Based on multi-finger image tool( MIT) and eight sector cement bond/density( RCB/RCD) device,structural integrity was observed for thermal casing string when cement sheath qualified. Otherwise the buckling occurred. Laboratory test results indicated that service behavior of material characterized with strain strengthening,stress relaxation and low cycle fatigue,and then casing became thermal elastic-plastic stage. Finite element numerical simulation based on energy principle showed that the casing buckling can be attributed to lateral displacement in the first interface between casing and cement sheath.
The mechanism of casing buckling was studied in view of service behavior for both material and casing using laboratory test and numerical simulation,which aimed at structural instability due to casing buckling for steam thermal well. Based on multi-finger image tool( MIT) and eight sector cement bond/density( RCB/RCD) device,structural integrity was observed for thermal casing string when cement sheath qualified. Otherwise the buckling occurred. Laboratory test results indicated that service behavior of material characterized with strain strengthening,stress relaxation and low cycle fatigue,and then casing became thermal elastic-plastic stage. Finite element numerical simulation based on energy principle showed that the casing buckling can be attributed to lateral displacement in the first interface between casing and cement sheath.
引文
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[7]林元华,邓宽海,曾德智,等.非均匀挤毁测试研究C110套管的变形规律[J].机械科学与技术,2015,34(2):315-319.
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[10]宋明,杨凤香,宋胜利,等.固井水泥环对套管承载能力的影响规律[J].石油钻采工艺,2002,24(4):7-9.
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[12]赵增新,高德利.高温斜直热采井管柱热屈曲探讨[J].钻采工艺,2008,31(6):98-101.
[13]NOWINMA J,KAISER T,LEPPER B. Strain-based design of tubular for extreme-service wells(SPE 105717)[C]//SPE/LADC Drilling Conference&Exhibition,20-22 February,2007,Amsterdam. SPE,2007.
[14]XIE J. Casing design and analysis for heavy oil wells[C]//First World Heavy Oil Conference,Beijing,China,November 2006.
[2]邓金根,田红,王治中,等.非均匀外载作用下油井套管强度特征的实验研究[J].岩土力学,2005,26(6):855-858.
[3]邹灵战,邓金根,曾义金,等.深井盐层套管非均匀载荷计算与套管设计方法研究[J].石油钻探技术,2008,36(1):23-27
[4]PATTILLO P D,LAST N C,ASBILL W T. Effect of non-uniform loading on conventional casing collapse resistance[J].Journal of SPE Drilling&Completion,2004,19(3):156-163
[5]殷有泉,李平恩.非均匀载荷下套管强度的计算[J].石油学报,2007,28(6):138-146.
[6]高德利,郑传奎,覃成锦.蠕变地层中含缺陷套管外挤压力分布的数值模拟[J].中国石油大学学报(自然科学版),2007,31(1):56-62.
[7]林元华,邓宽海,曾德智,等.非均匀挤毁测试研究C110套管的变形规律[J].机械科学与技术,2015,34(2):315-319.
[8]房军,岳伯谦,赵怀文,等.非均匀地应力作用下套管和水泥环表面受力特性分析[J].石油大学学报(自然科学版),1997,21(1):46-48.
[9]陈朝伟,殷有泉.水泥环对套管载荷影响的理论研究[J].石油学报,2007,28(3):41-44.
[10]宋明,杨凤香,宋胜利,等.固井水泥环对套管承载能力的影响规律[J].石油钻采工艺,2002,24(4):7-9.
[11]高德利,高宝奎.水平井段管柱屈曲与磨阻分析[J].石油大学学报(自然科学版),2000,24(2):1-4.
[12]赵增新,高德利.高温斜直热采井管柱热屈曲探讨[J].钻采工艺,2008,31(6):98-101.
[13]NOWINMA J,KAISER T,LEPPER B. Strain-based design of tubular for extreme-service wells(SPE 105717)[C]//SPE/LADC Drilling Conference&Exhibition,20-22 February,2007,Amsterdam. SPE,2007.
[14]XIE J. Casing design and analysis for heavy oil wells[C]//First World Heavy Oil Conference,Beijing,China,November 2006.