基于SPH法的套管冲蚀特性及结构优化研究  

SPH-Based Research on Erosion Characteristics and Structural Optimization of Casing

作　　者：张磊[1] 王晨锐 Zhang Lei;Wang Chenrui(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing))

机构地区：[1]中国石油大学(北京)机械与储运工程学院

出　　处：《石油机械》2025年第1期89-97,共9页China Petroleum Machinery

基　　金：中国石油天然气股份有限公司科研项目“可开关固井滑套压裂起裂机理及结构优化研究”(21GJ-FW-010)。

摘　　要：针对固井滑套压裂中冲蚀特性及结构优化等问题,基于光滑粒子动力学方法(SPH)建立球形砂粒冲击金属表面的SPH数值模型,模拟多个砂粒冲击套管材料42CrMo的微观过程,分析砂粒的撞击行为与冲蚀之间的关系;同时利用CFD模拟方法与Oka冲蚀模型结合现场实际工况,对不同端口特性的套管内壁进行冲蚀磨损的数值计算。研究结果表明:SPH法能较好地表现出砂粒在撞击套管材料时的微观变形,有助于研究微观下材料的变形影响因素,且由SPH法模拟得到的无量纲冲蚀速率随冲击角度变化的模拟数据与Oka冲蚀公式中冲击角函数趋势相符。端口特性参数对套管内壁的冲蚀有着较大的影响,具体表现在:随着端口数量、端口面积的增加,平均冲蚀速率均有一定程度的减小,但存在着边际递减效应;在研究的4种端口形状中,胶囊形端口的平均冲蚀速率最小。研究结果可为套管端口优化设计提供参考。For purpose of erosion characteristic research and structural optimization in cementing sliding sleeve fracturing,based on smoothed particle hydrodynamics(SPH),a SPH numerical model of spherical sand particle impacting metal surface was built.The micro process of multiple sand particles impacting casing material 42CrMo was simulated,and the relationship between sand particle impact behavior and erosion was analyzed.Meanwhile,combined with field conditions,the computational fluid dynamics(CFD)simulation method and the Oka erosion model were used for numerical calculation on the erosion wear of casing inwall with different port characteristics.The research results show that the SPH method can effectively reflect the microscopic deformation of sand particles when impacting casing materials,which is helpful for studying the factors affecting material deformation at the microscopic level.The simulation data of variation of dimensionless erosion rate with impact angle obtained by SPH method is consistent with the trend of impact angle function in the Oka erosion formula.The port characteristic parameters have a great influence on the erosion of casing inwall.As the number and area of ports increase,the average erosion rate decreases to some extent,but there is a marginal decline effect.Among the four port shapes studied,the capsule shaped port has the lowest average erosion rate.The research results provide references for the optimum design of casing port.

关 键 词：水力压裂 光滑粒子流体动力学 微观冲击模型 套管冲蚀 端口特性参数 

分 类 号：TE28[石油与天然气工程—油气井工程]