井口处连续油管最大允许轴向载荷分析  

Analysis of Maximum Allowable Axial Load of Coiled Tubing at Wellhead

作　　者：王飞文 杨斌[1] 张迪盛 许红林[1] 付焘 宋洪奇 WANG Feiwen;YANG Bin;ZHANG Disheng;XU Honglin;FU Tao;SONG Hongqi(School of Petroleum and Natural Gas Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;Chuandong Drilling Company,China National PetroleumCorporation Chuanqing Drilling Engineering Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]重庆科技学院石油与天然气工程学院,重庆401331 [2]中国石油集团川庆钻探工程有限公司川东钻探公司,重庆401120

出　　处：《石油矿场机械》2020年第1期1-5,共5页Oil Field Equipment

基　　金：国家自然科学基金项目“基于超弹性本构模型的实体膨胀套管悬挂橡胶桶锚定作用力学机理研究”(51401048);国家自然科学基金项目“高温接触应力松弛对特殊螺纹微观动态泄漏的影响机理研究”(51804060);重庆市研究生科研创新项目“连续油管下井作业时井口处力学特性分析与疲劳寿命预测研究”(CYS18341)

摘　　要：针对井口处的连续油管,考虑残余曲率,通过梁弯曲理论推导出连续油管的形态方程和挠度方程,建立了连续油管截面应力模型和最大允许轴向载荷模型。研究表明,连续油管易在凹侧外表面产生过大压应力,发生强度失效;连续油管最大允许轴向载荷随着井口处长度增大而减小,随着连续油管壁厚增大而增大。井口处长度对最大允许轴向载荷起主要作用,在实际应用过程中应尽可能缩短注入头下端和井口位置上端之间的长度。For the coiled tubing at the wellhead,considering the residual curvature,the morphological equation and deflection equation of the coiled tubing were derived by the beam bending theory,and the coiled tubing section stress model and the maximum allowable axial load model were established.The research shows that the coiled tubing is prone to excessive compressive stress on the outer surface of the concave side,and the strength failure occurs.The maximum allowable axial load of the coiled tubing decreases with the length of the wellhead,and increases with the increase of the wall thickness of the coiled tubing.The length at the wellhead plays a major role in the maximum allowable axial load.Therefore,the length between the lower end of the injection head and the upper end of the wellhead position should be as short as possible in practical applications.

关 键 词：连续油管 注入头 井口 截面应力 轴向载荷 

分 类 号：TE933.303[石油与天然气工程—石油机械设备]