地面喷射引流器结构参数优化及工作性能模拟  

Structural Parameter Optimization and Working Performance Simulation of Surface Jet Drainage System

作　　者：王志彬 阿布大双 冯春宇 孙风景 马辉运 Wang Zhibin;ABU Dashuang;Feng Chunyu;Sun Fengjing;Ma Huiyun(National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University;Engineering Technology Research Institute,PetroChina Southwest Oil&Gas Field Company)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]中国石油西南油气田公司工程技术研究院

出　　处：《石油机械》2024年第5期124-131,共8页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司西南油气田公司科研项目“喷射气举工艺影响因素及设计方法优化研究”(JS2022-66J)。

摘　　要：为了解决地面喷射引流器的结构参数及工作参数对其工作性能影响规律性认识的问题,以及地面喷射引流工艺效果不显著的问题,以四川某井组为例,利用气动力函数法初步设计了喷射器的结构参数;采用数值模拟方法,以引射系数为性能指标参数,分析了气相喷射器的内部流场;同时对气相喷射器的结构进行了优化,得到了结构尺寸参数和运行工况参数对引射系数的影响规律及喷射器最佳结构尺寸。研究结果表明,在设计工况下喷嘴出口倒角对引射性能的影响较小,角度在3.5°~5.0°均能较好工作,喷嘴距的长度与喷嘴喉部直径比为1.5,混合管截面段与喷嘴喉部最佳直径比为1.64。壅塞状态(临界流)下,增大引射压力能够提升引射系数,降低出口压力并不能提高引射系数;非壅塞状态下,增大工作压力、引射压力和减小出口压力均能提升引射系数。研究结果可为地面喷射引流效果的因素及规律提供新的认识,并为喷射器结构参数优化设计提供重要理论依据。The impacts of structural parameters and working parameters of the surface jet drainage system on its working performance are unknown,and the process effect of the system is not significant.Taking a well group in Sichuan as an example,the structural parameters of the gas ejector were preliminarily designed by using the aerodynamic function method.Then,the internal flow field of the gas ejector was analyzed through numerical simulation with the ejector coefficient as the performance index parameter.Furthermore,the structure of the gas ejector was optimized.Finally,the impacts of two parameters(structure size and operating condition)on the ejector coefficient and the optimal structure size of the ejector were determined.The results show that under the designed conditions,the nozzle outlet chamfer has little impact on the ejection performance,and the nozzle can work well at the chamfer angle of 3.5°~5.5°.The ratio of the nozzle distance to the nozzle throat diameter is 1.5,and the optimum diameter ratio between the section of the mixing tube and the nozzle throat is 1.64.In choked(critical flow)state,increasing the ejection pressure can improve the ejection coefficient,but decreasing the outlet pressure cannot elevate the ejection coefficient.In unchoked state,the ejection coefficient can be improved by increasing the working pressure and ejection pressure and decreasing the outlet pressure.The research provides new insights on the effect of surface jet drainage and also valuable basis for optimizing the structural parameters of the ejector.

关 键 词：喷射器 数值模拟 结构优化 引射系数 壅塞现象 激波 

分 类 号：TE242[石油与天然气工程—油气井工程]