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
Key words
liquid nitrogen/swirling jet/flow field analysis/computational fluid mechanics
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