基于仿真的复合冲击破岩流固热耦合场分析  

Analysis on Fluid-Solid-Thermal Coupling Field in Rock Breaking Under Composite Impact Loads Based on Simulation Model

作　　者：曹继飞[1,2] 邹德永 李成[2] 王旱祥 车家琪[1] 张伟强[2] 黄哲 Cao Jifei;Zou Deyong;Li Cheng;Wang Hanxiang;Che Jiaqi;Zhang Weiqiang;Huang Zhe(China University of Petroleum(East China);Drilling Technology Research Institute,Sinopec Shengli Petroleum Engineering Co.,Ltd.)

机构地区：[1]中国石油大学(华东) [2]中石化胜利石油工程有限公司钻井工艺研究院

出　　处：《石油机械》2024年第8期61-69,共9页China Petroleum Machinery

基　　金：中国石油化工集团有限公司重点实验室项目“全尺寸PDC钻头破岩机理与优化设计研究”(KLJP23022);山东省博士后创新项目“难钻地层多维载荷破岩井底耦合动态研究”(KLJP23022);中石化石油工程技术服务有限公司青年创新项目“PDC钻头井底多场耦合动态仿真研究”(SG23-06Q)。

摘　　要：为了揭示复合冲击载荷下全尺寸PDC钻头破岩机理,以温度为纽带,通过迭代算法建立复合冲击载荷下PDC钻头破岩流固热耦合仿真分析模型,同时以PDC钻头切削齿温度为评价指标验证仿真模型;从动态破岩过程、力学变化行为、温度演化规律和流场分布特征等4个方面完成复合冲击载荷下全尺寸PDC钻头破岩工作特性分析。分析结果表明:PDC钻头破岩流固热耦合仿真分析模型误差在10%以内,满足工程分析精度需求;PDC钻头破岩过程分为单齿破岩、平面破岩和深度破岩3个阶段,增加复合冲击载荷后PDC钻头最大扭矩增大66.3%,平均扭矩增大28.0%;PDC钻头的高温区域分布在钻头最底部切削齿表面,最高温度达到166.9℃;钻井液在PDC钻头刀翼外侧切削齿产生高压区域,最大压力达到107.9 kPa;钻井液在喷嘴出口处流速最大,达到6.1 m/s。研究结果可为揭示复合冲击破岩机理、开发高效PDC钻头提供理论指导和技术支持。In order to reveal the rock-breaking mechanism of full-size PDC bit under composite impact loads,from the perspective of temperature,a simulation model of fluid-solid-thermal coupling in rock breaking of PDC bit under composite impact loads was built using iterative algorithm,and verified by taking the temperature of cutter of PDC bit as the evaluation indicator.Moreover,the rock-breaking performances of full-size PDC bit under composite impact loads were analyzed from 4 aspects(dynamic rock-breaking process,mechanical change behavior,temperature evolution law,and flow field distribution).The analysis results show that the error of the simulation model is below 10%,meeting the required accuracy in engineering analysis.The rock-breaking process of PDC bit is divided into 3 stages:rock breaking of single cutter,rock breaking on plane and rock breaking in depth.After having increased the composite impact loads,the maximum torque of PDC bit is increased by 66.3%,and the average torque is increased by 27.5%.The high-temperature area of PDC bit is distributed on the surface of the cutter at the bottom of the bit,with a maximum temperature coming to 166.9℃.The drilling fluid creates a high-pressure area on the cutter on the outer side of blade of the PDC bit,with a maximum pressure coming to 107.9 kPa.The drilling fluid has the highest flow rate at the nozzle exit,reaching 6.1 m/s.The research results provide theoretical guidance and technical support for revealing the mechanism of composite percussive rock breaking and developing efficient PDC bits.

关 键 词：PDC钻头 复合冲击 全尺寸 破岩 流固热耦合 

分 类 号：TE921[石油与天然气工程—石油机械设备]