第38参第5期 2016年9月
石油钻采工艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号：10007393(2016)05-065007
DOI: 10.13639/j.odpt.2016.05.020
连续油管井下弯曲段沿程压降计算方法
姚利明何俊才？刘巨保】兰乘宇！刘玉喜”张宇
Vol. 38 No. 5 Sept. 2016
1.东北石油大学机城科学与工程学院；2.中国石油大庆钻探工程公司钻井二公司；3.中国石油大庆油田井下作业分公司
弓用格式：姚利明，何位才，刘巨保，兰豪宇，刘玉喜，张宇，连续油管并下弯曲段治程压降计算方法「J」·石油钻采工艺， 2016,38(5):650-656.
摘要：随着压裂技术的发展，压裂工艺和管柱结构日益复杂，特剂是并下事曲段管柱曲率半径由儿米到儿千米不等。采用数值模拟的方法，结合连续油管儿何待征，建立直管、弯管数值仿真模型，计算不同工况下沿程压降，数值仿真结果与理论计算结果对比，弯管误差小于5%，直管误差小于6%，验证了数值模型的准确性。计算了再率率径为1.25~1280m的弯管活程压降，数值仿真结与事管理论计算结果对比表明，弯管由率半径小于某一临界值时（该临界值与流体介质和排量有关)，数值仿真与弯管理论计算结果吻合较好，当曲率半径大于这一临界值时，弯管理论计算结果偏小，甚至小于直管压降。为此，依据数值仿真
关键词：连续油管；弯管；曲率半径；压降；数值仿真
中图分类号：TE357.1
文献标识码：A
Calculation methods for pressure drop along downhole bending section of coiled tubing
YAO Liming , HE Juncai', LIU Jubao', LAN Chengyu', LIU Yuxi', ZHANG Yu
1. College of Mechanical Science and Engineering, Northeast Petroleam University, Daging, Heilong/iang 163000, China; 2. No.2 Drilling Compay,Daqing Drilling Engineering Corporation, CVPC, Daqing, Heilongjiang 163318, Chind; 3. Dowmhole Operation Company, PebroChina Daging Oifield Compay, Daqing, Heilong/iang 163453, China
Citation: YAO Liming, HE Juncai, LIU Jubao, LAN Chengyu, LIU Yuxi, ZHANG Yu. Calculation methods for pressure drop along downhole bending section of coiled tubing [ J J . Oil Drilling & Production Technology, 2016, 38(5): 650-656.
Abstract: With the development of fracturing technologies, fracturing process and string structures become more and more com-plicated, especially the curvature radius of pipe string in downhole bending section is varying from a few meters to thousands of meters The numerical simulation model for straight pipes and bends was established by means of numerical simulation based on the geometric characteristics of coiled tubing. Then, the on-way pressure drop in different working conditions was calculated and compared with the theoretical calculation result. It is verified that the numerical model is accurate with the error of bend and straight pipe lower than 5% and 6% respectively. The pressure drop along the bend with curvature radius of 1.25-1 280 m was calculated and then compared with the numerical simulation result. It is shown that the numerical simulation result coincides well with the theoretical calculation result when the curvature radius of bend is shorter than a certain critical value which is related to fluid medium and displacement. When the curvature radius of bend is longer than the certain critical value, the theoretical calculation result of bend is lower, and even lower than the pressure drop of straight pipe. Finally, the theoretical pressure drop formula of bend was corrected according to the numerical simulation results. It broadens the calculation range of pressure drop calculation formula of bends, and provides the reliable calculation formula for thc
基金项目：国家白然科学基金“流致管求振动与避撞机理的构合动力学特性研究"（编号：11272085)；东北石油大学研究生科技创新
项目“要案油气减压裂管柱输逐流体机理研究"（编号：YJSCX2015-023NEPU)
第一作者：姚利明（1991-),油气田机械工程专业在续博士研究生，从事压裂管柱、并下工具等方面的研究。通讯地址(163000)黑龙江省
大庆市高新技术开发区发展路199号。E-mail：327603785@qq-com
通讯作者：刘巨保（1963-),博士生争师，教投，从事压裂管柱、并下工具等方面的科研与教学工作。通试地址：(163000)黑龙江省大庆市
高新技术开发区发展路199号。E-mail：jslx2000@163.com
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