基于CFD的排屑管路弯头局部冲蚀磨损研究  

CFD-based Research on the Local Erosion and Abrasion of Cutting-conveying Pipeline Elbow

作　　者：黄勇[1] 王雪东[2] 王京印[1] 张锐[1] 

机构地区：[1]中国石油大学(华东)石油工程学院 [2]辽宁工程技术大学矿业学院

出　　处：《石油机械》2014年第2期6-9,共4页China Petroleum Machinery

基　　金：国家863计划项目"海上大位移井钻完井关键技术开发与集成"(SQ2011AAJY3058);国家科技重大专项"深水流动安全保障与水合物风险控制技术"(2011ZX05026-004-08);中央高校基本科研业务费专项资金资助项目"纳米颗粒封堵页岩孔喉仿真模拟研究"(14CX02040A)

摘　　要：排屑管路弯头磨损失效是气体钻井中的常见问题,严重影响钻进效率.为深入研究弯头磨损机理,采用计算流体动力学CFD软件对弯头内气固两相流场进行了数值模拟研究.研究结果表明,高速气流携带岩屑经过弯头时,受惯性力作用,岩屑颗粒在外壁面一侧汇聚,造成管壁冲蚀磨损,磨损区域位于弯头30° ～ 60°转角位置,弯管磨损速率的最大值远高于其平均值,说明弯管局部刺漏要远早于弯管的整体磨损失效.根据弯头磨损分布特点,对排屑管路弯头进行结构改进,在壁面主要磨损位置设置挡板.现场试验结果表明,连续钻进80 m,弯管没有刺漏,钻进效果显著提高.The elbow abrasion failure of cutting-conveying pipeline is a common problem in gas drilling, which seriously affects drilling efficiency. To conduct an in-depth study of elbow abrasion mechanism, the CFD software was used to make a numerical simulation study of gas-solid phase flow field within elbow. The research findings show that, when high-velocity air current carries cuttings to pass through elbow, cutting particles gather on one side of the external wall due to the effect of inertial force, resulting in the erosion and abrasion of pipeline wall. The ab- rasion zone is located in the 30~ ~ 60~ comer position of elbow. The maximum value of elbow abrasion rate is far lar- ger than its average value. This indicates that elbow＇ s local piercing-caused leakage is much earlier than its global abrasion failure. According to the distribution feature of elbow abrasion, the structural modification of cutting-conve- ying pipeline elbow was conducted. The baffle was designed in the main abrasion position of wall surface. The field test was carried out, with a continuous 80-meter drilling. No piercing-caused leakage happens to elbow. The drilling effect is improved remarkably.

关 键 词：排屑管路 弯头 气固两相流 磨损 结构优化 CFD 

分 类 号：TE926[石油与天然气工程—石油机械设备]