侧钻井弯曲段套管抗挤强度研究及应用
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摘要
为了确保侧钻井造斜段套管抗挤强度能够满足钻井作业过程中的安全要求,建立了套管在受到弯曲载荷状态下的力学模型,对其进行理论分析,并利用ANSYS有限元软件模拟验证,研究套管抗挤强度与弯曲曲率、径厚比及轴向载荷之间的关系。研究结果表明:套管的抗挤强度随套管弯曲率的增加而降低,且管壁越薄下降速度越快,当套管弯曲率到达套管极限时,套管抗挤强度几乎相等;在一定的曲率条件下,套管抗挤强度随着径厚比的增加而降低;同一套管规格和尺寸条件下,外径小的抗挤强度随径厚比下降速度趋势远大于外径较大的套管;随着曲率的增加,径厚比与套管抗挤强度关系变的越来越平缓,因此,径厚比对抗挤强度的影响不是固定的。在弯曲条件下,同时考虑弯曲载荷和综合轴向载荷时,随着套管弯曲率的增加,轴向载荷对套管抗挤强度的影响在逐渐减少。研究成果可以为侧钻井造斜段套管的抗挤强度的设计提供参考。
In order to guarantee the casing collapsing strength at the drilling deflection measurement section's satisfaction of the safety requirements during drilling operation,the casing under bending load condition of mechanical force model was established and the theoretical analysis was carried out.The ANSYS finite element software simulation validation was applied on the casing collapsing strength,bending curvature,diameter-thick ratio and the relationship between the axial load.The results show that the casing compressive strength decreases exponentially with the increase of casing bending rate.The compressive strength of casing pipe with thinner wall decreases obviously compares with the thicker wall.when the bending rate reaches a certain degree,the compressive strength of casing pipe is almost equal.Under certain curvature conditions,the casing extrusion strength decreases with the increase of the diameter to thickness ratio.With the same casing size and specification,the decreasing speed of the compressive strength with small diameter is much greater than that with large diameter.With the increase of curvature,the relationship between the diameter-thickness ratio and the casing extrusion strength becomes more and more gentle and the effect of the diameter-thickness ratio on the extrusion strength is not fixed.With the increase of casing bending rate,the effect of axial load on casing extrusion strength decreases gradually under bending condition.
In order to guarantee the casing collapsing strength at the drilling deflection measurement section's satisfaction of the safety requirements during drilling operation,the casing under bending load condition of mechanical force model was established and the theoretical analysis was carried out.The ANSYS finite element software simulation validation was applied on the casing collapsing strength,bending curvature,diameter-thick ratio and the relationship between the axial load.The results show that the casing compressive strength decreases exponentially with the increase of casing bending rate.The compressive strength of casing pipe with thinner wall decreases obviously compares with the thicker wall.when the bending rate reaches a certain degree,the compressive strength of casing pipe is almost equal.Under certain curvature conditions,the casing extrusion strength decreases with the increase of the diameter to thickness ratio.With the same casing size and specification,the decreasing speed of the compressive strength with small diameter is much greater than that with large diameter.With the increase of curvature,the relationship between the diameter-thickness ratio and the casing extrusion strength becomes more and more gentle and the effect of the diameter-thickness ratio on the extrusion strength is not fixed.With the increase of casing bending rate,the effect of axial load on casing extrusion strength decreases gradually under bending condition.
引文
[1]贾宗文,刘书杰,耿亚楠,等.弯曲井段套管抗挤强度理论及试验研究[J].石油机械,2018,46(9):100-105.
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[3]王同涛,闫相祯,杨秀娟,等.中短半径水平井弯曲段套管剩余抗挤强度分析[J].石油矿场机械,2009,38(9):28-32.
[4]徐德奎,任虎彪,李明飞,等.考虑弯矩和剪切影响的造斜段套管抗挤强度分析[J].石油机械,2016,44(9):11-14.
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[6]郑洋,薛超,邓宽海,等.非均匀载荷作用下套管弹塑性变形分析[J].科学技术与工程,2014,14(20):210-214.
[7]窦益华,张福祥.高温高压深井试油井下套管力学分析及其应用[J].钻采工艺,2007,30(5):17-20.
[8]王军.侧钻水平井弯曲段套管抗挤强度研究[J].石油机械,2011,39(7):37-41.
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[11]DENG K H,LIN Y H,QIANG H,et al.New high collapse model to calculate collapse strength for casing[J].Engineering Failure Analysis,2015(58):295-306.
[12]于洋洋,梁东亮,高翔,等.抽油杆断脱对抽油机井管柱设计的影响[J].内蒙古石油化工,2010(21):54-56.
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[14]YUKIHISA K,YASUSHI T.Effect of wear and bending on casing collapse strength[R].SPE 24597,1994.
[15]吴怀志,翟晓鹏,姬辉,等.砂岩储层出沙段套管强度分析[J].科学技术与工程,2013,13(10):2662-2665.
[16]魏玲,林元华,杜仁德,等.月牙形磨损缺陷套管的抗内压强度研究[J].机械科学与技术,2010,4(4):476-479.
[17]范森,陈顶峰,冯雷,等.基于KT模型的椭圆度对套管抗挤强度的影响[J].断块油气田,2017,24(5):426-429.
[18]林元华,曾德智,施太和,等.非均匀载荷下磨损套管抗挤强度研究[J].机械科学与技术,2006(5):557-559.
[19]张波,盛和太.ANSYS有限元数值分析与工程应用[M].北京:清华大学出版社,2005:190-192.
[20]王钊,付健红,周伟,等.膨胀套管的力学行为对抗挤强度的影响[J].西部钻探工程,2015(3):79-82.
[21]杨桂通.弹性力学[M].北京:高等教育出版社,1998:64-67.
[22]WEI L,LIN Y H,DU R D,et al.Study on internal pressure strength of crescent wear defect casing[J].Mechanical Science and Technology,2010,4(4):476-479.
[23]覃成锦,徐秉业,高德利,等.套管磨损后剩余抗挤强度的数值分析[J].石油钻采工艺,2000,22(1):6-8.
[2]蒋官澄,胡冬亮,许发宾.弯曲套管抗挤强度有限元ANSYS分析方法[J].断块油气田,2009,16(4):134-136.
[3]王同涛,闫相祯,杨秀娟,等.中短半径水平井弯曲段套管剩余抗挤强度分析[J].石油矿场机械,2009,38(9):28-32.
[4]徐德奎,任虎彪,李明飞,等.考虑弯矩和剪切影响的造斜段套管抗挤强度分析[J].石油机械,2016,44(9):11-14.
[5]TONG H,GUO D Q,ZHU X H.Application of multiphysics coupling FEM on open wellbore shrinkage and casing remaining strength in an incomplete borehole in deep salt formation[J]Mathematical Problems in Engineering,2015(4):1-9.
[6]郑洋,薛超,邓宽海,等.非均匀载荷作用下套管弹塑性变形分析[J].科学技术与工程,2014,14(20):210-214.
[7]窦益华,张福祥.高温高压深井试油井下套管力学分析及其应用[J].钻采工艺,2007,30(5):17-20.
[8]王军.侧钻水平井弯曲段套管抗挤强度研究[J].石油机械,2011,39(7):37-41.
[9]HUANG W J,GAO D L.A theoretical study of the critical external pressure for casing collapse[J].Journal of Natural Gas Science and Engineering,2015(27):290-297.
[10]LIN Y H,DENG K H,ZENG D Z,et al.Theoretical and experimental analyses of casing collapsing strength under non-uniform loading[J].Journal of Central South University,2014,21(9):3470-3478.
[11]DENG K H,LIN Y H,QIANG H,et al.New high collapse model to calculate collapse strength for casing[J].Engineering Failure Analysis,2015(58):295-306.
[12]于洋洋,梁东亮,高翔,等.抽油杆断脱对抽油机井管柱设计的影响[J].内蒙古石油化工,2010(21):54-56.
[13]贾宗文.考虑磨损的弯曲套管抗挤强度研究及应用[J].石油机械,2018,46(12):1-7.
[14]YUKIHISA K,YASUSHI T.Effect of wear and bending on casing collapse strength[R].SPE 24597,1994.
[15]吴怀志,翟晓鹏,姬辉,等.砂岩储层出沙段套管强度分析[J].科学技术与工程,2013,13(10):2662-2665.
[16]魏玲,林元华,杜仁德,等.月牙形磨损缺陷套管的抗内压强度研究[J].机械科学与技术,2010,4(4):476-479.
[17]范森,陈顶峰,冯雷,等.基于KT模型的椭圆度对套管抗挤强度的影响[J].断块油气田,2017,24(5):426-429.
[18]林元华,曾德智,施太和,等.非均匀载荷下磨损套管抗挤强度研究[J].机械科学与技术,2006(5):557-559.
[19]张波,盛和太.ANSYS有限元数值分析与工程应用[M].北京:清华大学出版社,2005:190-192.
[20]王钊,付健红,周伟,等.膨胀套管的力学行为对抗挤强度的影响[J].西部钻探工程,2015(3):79-82.
[21]杨桂通.弹性力学[M].北京:高等教育出版社,1998:64-67.
[22]WEI L,LIN Y H,DU R D,et al.Study on internal pressure strength of crescent wear defect casing[J].Mechanical Science and Technology,2010,4(4):476-479.
[23]覃成锦,徐秉业,高德利,等.套管磨损后剩余抗挤强度的数值分析[J].石油钻采工艺,2000,22(1):6-8.