液氮旋转射流流场结构特性研究  

Study on structure characteristics of liquid nitrogen swirling jet field

作　　者：李嘉文 杨睿月 黄中伟[1] 陈健翔 秦小舟 LI Jiawen;YANG Ruiyue;HUANG Zhongwei;CHEN Jianxiang;QIN Xiaozhou(State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]油气资源与工程全国重点实验室中国石油大学(北京),北京102249

出　　处：《流体机械》2024年第12期47-56,共10页Fluid Machinery

基　　金：国家重点研发计划项目(2021YFA0719101);国家自然科学基金面上项目(52274014);北京市自然科学基金项目(3222039)。

摘　　要：针对传统水力喷射技术中储层伤害和井筒坍塌等问题,提出将液氮旋转磨料射流喷射造穴技术作为一种新型无水完井方法,重点研究了液氮旋转磨料射流的流场结构特性及关键影响因素。结果表明,在相同条件下,相较于水射流,液氮旋转磨料射流展现出更高的速度,冲蚀速率为旋转磨料水射流的1.12倍,携带颗粒的速度比旋转磨料水射流提高11.4%;当压降从10 MPa提升至25 MPa时,液氮最大流速增加56.4%;温度从100 K升高到130 K,最大射流速度增加5.7%;质量流量从0.04 kg/s增加到0.10 kg/s时,冲蚀强度提升60.7%。研究结果可为煤层气液氮射流喷射造穴完井技术提供理论基础。To address the problems of reservoir damage and shaft collapse associated with conventional hydraulic jet technology,swirling abrasive liquid nitrogen jet cavitation technology was proposed as a novel waterless well completion method with focus on the flow field structural characteristics and key influencing factors of swirling abrasive liquid nitrogen jet.The results indicate that under the same conditions,the swirling abrasive liquid nitrogen jet exhibits higher velocity than that of swirling abrasive water jet.The erosion rate of the swirling abrasive liquid nitrogen jet is about 1.12 times that of the swirling abrasive water jet,with an 11.4%increase in particle-carrying velocity.When the pressure drop increases from 10 MPa to 25 MPa,the maximum liquid nitrogen flow velocity increases by 56.4%.As temperature rises from 100 K to 130 K,the maximum jet velocity increases by 5.7%.When mass flow rate increases from 0.04 kg/s to 0.10 kg/s,the erosion rate increases by 60.7%.The research results can provide theoretical basis for the liquid nitrogen jet cavitation and well completion technology in coalbed methane wells.

关 键 词：液氮 旋转射流 流场分析 计算流体力学 

分 类 号：TH137[机械工程—机械制造及自动化] TP69[自动化与计算机技术—控制理论与控制工程]