氮气钻井多功能四通冲蚀磨损计算与预测  

Erosive Wear Calculation and Prediction of Multifunctional Cross Joint for Nitrogen Drilling

作　　者：张宏伟[1,2] 汪爽[1,3] 柴希军 陶云 柴希伟 孟璋稢 

机构地区：[1]西南石油大学 [2]大港油田工程研究院 [3]公安部四川消防研究所 [4]中石油川庆钻探工程公司

出　　处：《石油机械》2014年第9期35-39,104,共6页China Petroleum Machinery

基　　金：中石油2011年塔里木油田重点项目"工艺安全与钻完井工程基础研究"之子课题"井口装置"(TLMYT-2011-GC-007)

摘　　要：高产储层在采用氮气钻井时,由于气体流量大、携岩能力强、作业时间长,从井底返回的高压、高速和高携岩量气固两相流极易使多功能四通产生冲蚀。应用流体动力学与冲蚀磨损模型耦合计算方法,计算了实际放喷工况下多功能四通的流体特征和冲蚀磨损情况,并将计算结果与四通的实际冲蚀损伤检测结果进行对比;依据多功能四通的冲蚀磨损深度与工作时间的关系曲线,结合实际的主要冲蚀区域分布,对作业过程中的多功能四通冲蚀磨损情况进行了提前预测。分析结果表明,多功能四通的旁通冲蚀损伤最为严重,旁通的损伤主要是在放喷工况下造成;冲蚀磨损计算结果与实际冲蚀检测结果吻合,说明冲蚀磨损计算能准确地揭示放喷工况下高速、高压、高携岩量气固两相流对多功能四通的磨损情况。For nitrogen drilling in high yield reservoir, the multifunctional cross joint is prone to erosive wear due to high pressure, high speed and high cutting volume two phase （gas-solid） flow, as a result of high gas flow rate, great cutting carry capacity and long operation time. Based on the coupled fluid dynamics and erosion model, the flow features and erosive wear of multifunctional cross joint in actual blow out condition are calculated and then compared with the inspected results. On the basis of relation curve of erosive wear depth and the erosion time, and combining the actual distribution of major erosion area, the erosive wear of multifunctional cross joint in operation is predicted. The results show that the bypass of multifunctional cross joint has the most serious erosion damage, which is mainly caused at the blowout conditions. The calculation results match well with the actual erosion results, demonstrating that erosive wear calculation can accurately reveal the erosion damage caused by high pressure, high speed and high cutting volume two phase flow at blowout conditions.

关 键 词：氮气钻井 多功能四通 气固两相流 冲蚀磨损 旁通 放喷 

分 类 号：TE921[石油与天然气工程—石油机械设备]