钻井过程中井眼的精确深度是一个不容忽视的问题,为减小随钻测量的井深误差,避免井眼轨迹的不确定性,利用建立的钻井液循环状态下非稳态传热模型,分析了钻井过程中井眼温度分布对井深测量数据的影响。在此基础上,采用摩阻扭矩力学模型,对钻柱在拉压状态下变形引起的井深误差展开探讨。实例分析表明,此方法得到的井深数据误差椭球体积减小,测深误差总修正比为40.7%,对大位移井和救援井井深的精确计算有一定参考价值。

In order to accurately measure the well depth, reduce the well depth error during the measurement while drilling, and reduce the uncertainty of the wellbore trajectory, the unsteady heat transfer model of the drilling fluid circulation state is established according to the basic principle of heat transfer,and the drilling process is analyzed.The wellbore temperature distribution is analyzed and calculated for the well depth error caused by the deformation of the drill string affected by the temperature effect.Based on the frictional torque mechanics model, the error of the well depth caused by the deformation of the drill string under tension and compression is discussed.The error of the research well was corrected by the combined temperature and the influence of tension and pressure on the well depth error. The volume of the error ellipsoid was reduced by 40.7%. Finally, a case analysis using the proposed correction method can provide a theoretical reference for accurate well depth calculation in large displacement wells and rescue wells.