大位移井、水平井扭矩摩阻分析与三维建模  

Analysis and 3D Modeling of the Friction Torque for Large Deviated Wells and Horizontal Wells

作　　者：李智鹏 许京国 吴海燕 安秀娟 焦涛 姜思诚 

机构地区：[1]中国石油渤海钻探第三钻井公司

出　　处：《石油工业计算机应用》2015年第3期23-31,3,共9页Computer Applications Of Petroleum

摘　　要：定向钻井作业中,特别是复杂井、大位移井和水平井钻井过程中极度的钻柱扭矩和摩阻给钻井作业带来了极大的困难和挑战。为了监测钻井过程中可能出现的类似问题,作为一种预测和监测方法,扭矩摩阻模型可以在井的设计阶段和钻井过程中预测和分析此类问题。当今钻井业界广泛使用的扭矩摩阻模型大都基于20多年前推出的方程,这些方程至今没有多大改变。本文对钻井作业中有关扭矩摩阻的基本原理、导致扭矩摩阻大的因素、井眼轨迹、钻杆屈曲以及岩屑运移等问题做出一些阐述和分析,简要介绍了标准扭矩摩阻模型,同时,引入了一组最新推出的三维扭矩摩阻模型,并分别给出了不同井段的扭矩摩阻模型。最后,根据大位移井和水平井钻井扭矩和摩阻大的特点,给出了水平井降低扭矩摩阻的钻柱设计准则,目的在于有效传送井底钻压,减小钻柱屈曲,提高井身质量和钻井效率。Extreme drill string torque and friction bring great difficulties and challenges to drilling operation in oriental drilling especially in complex wells,large deviated wells and horizontal wells.To monitor the similar problems occurred in the process of drilling,the friction torque model as a forecasting and monitoring method can forecast and analyze such problems in the process of designing and drilling.The currently widely used friction torque model in drilling industry is mostly based on the equations introduced 20 years ago,which have not changed much.The basic principle of friction torque,factors of large torque friction,well track and drill string buckling and cuttings migration issues are formulated and analyzed in this paper.The standard torque friction model is briefly introduced.Some latest 3Dfriction torque models are introduced at the same time.The paper presents torque friction models of different intervals.Finally,according to the torque and friction characteristics of large deviate wells and horizontal wells,the drill string design criterion of friction torque reduction is given,which goal is to transfer downhole drilling pressure effectively and reduce the drill string buckling to improve the quality of well bore and drilling efficiency.

关 键 词：扭矩 摩阻 模型 井眼轨迹 大位移井 水平井 钻柱设计 

分 类 号：TE243[石油与天然气工程—油气井工程]