连续油管下入作业力学特性研究

Study on Mechanical Properties of Coiled Tubing Setting Operation

摘要: 连续油管在作业过程中，井下液体内外压及油管失稳弯曲等因素对连续油管造成极大影响。基于钻机作业下的井深坐标参数，建立井眼轨迹几何模型，采用复化辛普森求积公式的数值积分方法计算出井眼轴坐标参数；求解出的坐标参数，分别对连续油管的环空压力、轴向力及弯矩等连续油管力学特性进行分析计算。该研究为连续油管提供了力学分析基础。

Abstract: During the operation of coiled tubings, great influence would be induced because of the internal and external pressure of downhole fluid, tubing instability and bending as well as other factors. Based on the well depth coordinate parameters of drilling rig, the geometric model of well trajectory was established, and the numerical integration method of Simpson quadrature formula was used to calculate the well shaft coordinate parameters. Based on the obtained coordinate parameters, the mechanical properties of coiled tubing, such as annulus pressure, axial force and bending moment, were analyzed and calculated respectively. Based on the actual borehole trajectory parameters, the mechanical properties were analyzed with each equation. It provides a basis for analyzing the mechanical properties of coiled tubings.