液氮旋转射流流场结构特性研究OA北大核心CSTPCD

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.