致密砂岩油层改造压力作用下双筒液压封隔器弹塑性承载能力三维数值分析
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摘要
采用三维弹塑性有限元法,对双筒液压封隔器在油层改造压裂液压力作用下的变形行为进行计算和分析,得到在给定的工作压力下封隔器心轴各处的应力分布和塑性应变分布.主要的结论有:(1)在给定的95 MPa(13 775 psi)的压力下,最大等效应力达到102 MPa(14 800 psi),远远超过初始塑性屈服极限,表明结构中部分材料点进入塑性变形状态.(2)等效塑性应变的最大值为1.6%,分布在螺纹沟槽的底部.穿压孔两侧有明显的塑性变形区.(3)当载荷达到额定工作压力95MPa(13 775 psi)的60%时,应力开始达到初始塑性屈服极限,塑性应变开始出现,其出现的区域部位处于螺纹沟槽底部,环向位置大致在2个穿压孔中间位置上.该数值分析结果可为封隔器液压承载能力的确定提供参考.
With 3D elastoplastic finite element method,the numerical analysis is performed for mandrel of dual piston hydraulic packer under reservoir stimulation pressure for tight sand. The stress distribution and the plastic strain distribution within the structure are obtained and visualized. The major conclusions are:( 1) With the given hydraulic pressure loading of 95 MPa( 13 775 psi),the maximum value of von Mises stress can be as high as 102 MPa( 14 800 psi),which is obviously higher than the initial plastic yielding threshold of P110 steel;( 2) The maximum value of equivalent plastic strain can reach the value of 1. 6%,and it occurs at the root of screw tooth. The plastic strain also occurs at the neighborhood of hydraulic hole;( 3) The plastic strain starts to appear at the root of screw tooth as the hydraulic pressure loading reaches 60% of the regular working pressure value,which indicates that the elastic bearing capacity of packer's mandrel is 57 MPa( 8 265 psi). The numerical analysis results can provide reference for the design of dual piston hydraulic packer.
With 3D elastoplastic finite element method,the numerical analysis is performed for mandrel of dual piston hydraulic packer under reservoir stimulation pressure for tight sand. The stress distribution and the plastic strain distribution within the structure are obtained and visualized. The major conclusions are:( 1) With the given hydraulic pressure loading of 95 MPa( 13 775 psi),the maximum value of von Mises stress can be as high as 102 MPa( 14 800 psi),which is obviously higher than the initial plastic yielding threshold of P110 steel;( 2) The maximum value of equivalent plastic strain can reach the value of 1. 6%,and it occurs at the root of screw tooth. The plastic strain also occurs at the neighborhood of hydraulic hole;( 3) The plastic strain starts to appear at the root of screw tooth as the hydraulic pressure loading reaches 60% of the regular working pressure value,which indicates that the elastic bearing capacity of packer's mandrel is 57 MPa( 8 265 psi). The numerical analysis results can provide reference for the design of dual piston hydraulic packer.
引文
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[2]尹飞,高宝奎,金磊.压缩式封隔器坐封力学有限元分析[J].石油机械,2012,40(2):39-41.
[3]李永革.基于Abaqus的裸眼压裂封隔器应力分析[J].机电产品开发与创新,2011,24(3):108-109.
[4]步玉环,马明新,李建华,等.封隔器的密封性判据及结构设计方法研究[J].润滑与密封,2011,36(11):75-77.
[5]宋祖厂,盖旭波,刘扬,等.HRP液压封隔器性能参数数值模拟研究[J].石油机械,2011,39(5):41-44.
[6]陈健,田播源,刘玉文.压缩式封隔器胶筒失效因素分析及措施[J].科技资讯,2010(31):80-83.
[7]杨东,窦益华,许爱荣.温高压深井酸压封隔器失封原因及对策[J].石油机械,2008,36(9):129-131.
[8]KOTHIYAL M D,PARASHER A,QUTOB A H,et al.Through-tubing inflatable straddle packer assembly enables selective treatment of multiple zones and improves productivity[C]//SPE 163901-MS.2013 SPE/ICoTA Coiled Tubing&Well Intervention Conf&Exhibition.Woodlands,2013.
[9]TAYLOR D.Packer and safety valve development for ultra high pressure high temperature test and production wells[C]//SPE 23627-MS.Offshore Technol Conf.Houston,Texas,2012.
[10]WHALEY K,PRICE-SMITH C,MCNERLIN B,et al.The development and field performance of a novel openhole packer system for deepwater,high rate,water injection wells with downhole flow control:a deepwater field case history[C]//SPE 157712-MS.SPE Annu Tech Conf&Exhibition.San Antonio,2012.
[11]KESSLER C,HILL J,HOUSDEN R.Case histories of a new family of setting tools for ultra deep and high temperature well condition[C]//SPE128123-MS.North Africa Tech Conf&Exhibition.Cairo,2010.
[12]张国正,窦益华.5"RTTS封隔器断裂失效分析[J].理化检验,2005(S1):328-332.