反喷牵引直旋混合射流钻头自进力的实验测试与数值分析  

Experimental Study and Numerical Analysis on the Pulling Force of Self-Propelled Straight-Swirling Integrated Jet Bit

作　　者：吴德松[1,2] 廖华林[1] 贾夏 牛继磊[1] 李耀华 WU De-Song LIAO Hua-Lin JIA Xia NIU Ji-Lei LI Yao-Hua(School of Petroleum Engineering ,China University of Petroleum （East China ）, Qingdao 266580, China SINOPEC Qingdao Safety Engineering Institute ,Qingdao 266071 ,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油化工股份有限公司青岛安全工程研究院,山东青岛266071

出　　处：《高压物理学报》2016年第5期419-426,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(51274235);中央高校基本科研业务费专项资金

摘　　要：为探究径向侧钻微小井眼反喷牵引射流钻头自进力的主要影响因素,以反喷牵引直旋混合射流钻头的结构为基础,采用实验研究与数值模拟相结合的方法,研究了入口流量、井筒直径、正向喷距等因素对射流钻头自进力的影响规律。结果表明:反喷牵引直旋混合射流钻头的自进力大小受入口流量、井筒直径、实际正反流量比、返流强度等多种因素的综合影响;增大入口流量,增强射流钻头正、反向射流卷吸降压效果,有利于增大自进力;随着井筒直径的增加,反向射流的封隔效果减弱,返流干扰降低,自进力先增大后减小,并且在给定的流量下,存在获得最大自进力的井径范围。研究结果可为径向水平井射流钻头参数的优化设计与选取提供依据。In order to investigate the main factors influencing the pulling force of a self-propelled straight-swirling integrated jet bit,we studied the effects of the inlet flow rate,wellbore diameter,and spray distance on the pulling force by combining experimental measurements and numerical simula- tions. The results show that the pulling force of the jet bit is influenced by the inlet flow rate,the well diameter, the flow rate ratio of forward and backward flows and the return flow in the wellbore. As the inlet flow rate increases,the pressure-reducing effects of the forward and backward jet rise,which is beneficial to the increase of the pulling force~ when the wellhore diameter increases,the iet-sealing effects and the backflow interference will be weakened,leading to the pulling force increasing at first and then decreasing. At a designated inlet flow rate, an optimal wellbore diameter range can be obtained with the maximum pulling force. This work provides a significant reference for optimizing the design of jet bit parameters in radial horizontal wells.

关 键 词：高压射流 自进力 反喷牵引射流钻头 微小井眼 

分 类 号：O358[理学—流体力学] TD231[理学—力学]