中文摘要：

在 build 节的中间的 casings 服从于严重在扩大活动范围的钻穿。这篇论文为在中间的 casing 上预言一条 wear 沟的深度论述一个新方法。根据精力，原则和 casing 的动态累积由工具关节穿，一个模型被建立在 casing 的内部墙上计算 wear 区域。在 wear 沟深度和区域之间的关系功能基于在 drillstring 和 wear 节和假设之间的几何学关系被获得 casing 穿沟是新月形的。casing 的变化在不同尺寸的 drillstrings 下面穿沟深度对钻的英尺数也被讨论。一个机械模型为预言 casing 被建议穿地点，它基于井轨道和 drillstring 运动。casing 穿一口计划的井的沟深度与 casing 的倒置被预言从钻的井穿因素并且必然修订了为钻的井和计划的井之间的差别改进预言精确性。为预言 casing 的方法在扩大活动范围的钻穿通过实际案例研究被验证。casing 上的 drillstring 尺寸的效果穿应该在 casing 被考虑穿预言。

英文摘要：

Intermediate casings in the build sections are subject to severe wear in extended-reach drilling. This paper presents a new method for predicting the depth of a wear groove on the intermediate casing. According to energy principle and dynamic accumulation of casing wear by tool joints, a model is established to calculate the wear area on the inner wall of the casing. The relationship functions between the wear groove depth and area are obtained based on the geometry relationship between the drillstring and the wear section and the assumption that the casing wear groove is crescent-shaped. The change of casing wear groove depth versus drilling footage under different-sized drillstrings is also discussed. A mechanical model is proposed for predicting casing wear location, which is based on the well trajectory and drillstring movement. The casing wear groove depth of a planned well is predicted with inversion of the casing wear factor from the drilled well and necessarily revised to improve the prediction accuracy for differences between the drilled well and the planned well. The method for predicting casing wear in extended-reach drilling is verified through actual case study. The effect of drillstring size on casing wear should be taken into account in casing wear prediction.