水平井井筒清洁临界流速简化模型  

SIMPLIFIED MODEL OF CRITICAL FLUID VELOCITY FOR HOLE CLEANING OF HORIZONTAL WELL

作　　者：张好林[1] 李根生[1] 王伟[2] 黄中伟[1] 田守嶒[1] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室 [2]中国石油集团钻井工程技术研究院

出　　处：《钻采工艺》2014年第4期5-8,1,共4页Drilling & Production Technology

基　　金：国家重点基础研究发展计划(973计划)“深井复杂地层安全高效钻井基础研究”(No.2010CB226700)资助

摘　　要：石油钻井作业中井筒岩屑运移影响钻井成本、时间及成井质量，井筒岩屑运移问题已经成为钻井作业中亟待解决的问题。不论在水平井中的直井段还是水平段，流体拖曳力对于岩屑颗粒运移的作用超越其他作用力占据主导地位，井筒清洁临界流速计算的关键是确定拖曳系数计算的经验公式。根据拖曳系数与雷诺数关系的实验数据，对拖曳系数经验计算方法进行优选对比发现Turton的经验公式与实验数据平均误差最小，仅为3．06％；在优选对比拖曳系数的基础上，对岩屑颗粒进行微观受力分析，推导了岩屑颗粒运移临界流速，研究了井斜角对于岩屑颗粒临界运移流速的影响，计算结果发现在50°-70°之间临界运移流速最大，并对建立的数学模型进行了现场应用验证。Cuttings transport in wellbore affects the drilling cost,drilling time and well quality,and it has become the problem to be solved in drilling field. Drag force is mostly superior over other forces during cuttings transportation in vertical,horizontal sections of horizontal wells. Optimization of drag coefficient empirical equation is the key point to study the critical velocity that keeps hole cleaning. Based on experimental data of drag coefficient and Reynolds Number,the Turton's method has the minimum mean error of 3. 06% compared with experimental data. Through optimizing drag coefficient,the microscopic stress analysis of cuttings was conducted and the mathematical formula of cuttings critical transport velocity was derived,the effects of hole angle on cuttings critical transport velocity was studied and the result indicated that critical velocity came to maximum between 50°and 70°. At last,the mathematical model was verified with field data.

关 键 词：水平井 井筒清洁 岩屑运移 临界流速 固液两相流 

分 类 号：TE243[石油与天然气工程—油气井工程]