天然气引射器流场特性及有效工作区间研究  

Research on flow field characteristics and effective working range of natural gas ejector

作　　者：吴奇霖 刘硕[2] 许晶禹[2,3] WU Qilin;LIU Shuo;XU Jingyu(Shenzhen Branch of CNOOC,Ltd.,Shenzhen 518000,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100149,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000 [2]中国科学院力学研究所,北京100190 [3]中国科学院大学工程科学学院,北京100149

出　　处：《流体机械》2023年第1期85-91,共7页Fluid Machinery

基　　金：国家自然科学基金青年基金项目(12102436);中海石油(中国)深圳分公司基金项目(CCL2021SZPS0332)。

摘　　要：为了降低天然气开采成本,探索天然气引射器重复使用的可行性,对不同工况下天然气引射器的内部流场开展分析,探究流场特性和有效工作区间,并通过现场生产数据对数值模拟方法进行了验证。研究表明,引射器喷嘴附近出现压力、温度和速度极值点;固定出口压力5 MPa,当高压井压力从6 MPa提升至13 MPa时,可携带的低压井压力可从5 MPa降至3.5 MPa,期间,引射器内部负压区压力降低,速度峰值提高,且峰值附近温度降低;有效工作区间内,通过匹配入口条件可改善引射效果,提高被引射井开发效率,即在该参数范围内可重复使用引射器。In order to investigate the feasibility of natural gas ejector reuse and reduce the cost of natural gas extraction,the internal flow field of the natural gas ejector under different working conditions was analyzed through systematic numerical simulation,the flow field characteristics and effective working range were investigated and the numerical simulation method was verified through the field production data.Research shows that there are extreme points of pressure,temperature and velocity near the ejector nozzle.When the outlet pressure is fixed at 5 MPa and the high pressure well pressure is increased from 6 MPa to 13 MPa,the portable low-pressure well pressure can be reduced from 5 MPa to 3.5 MPa,accompanied with pressure decrease in low pressure zone,increase of velocity peak value and decrease of temperature thereby.In the effective working range,properly matched boundary condition can help enhance ejection performance and improve development efficiency of the ejector well,that is,the ejector can be re-used in the range of this parameter.

关 键 词：天然气引射器 压力 流量 引射效果 工作区间 

分 类 号：TH48[机械工程—机械制造及自动化]