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针对煤粉颗粒沉积在煤层气井底部导致埋泵等问题,提出利用射流泵的负压吸附原理和双层同心管柱结构,设计的负压射流快速排煤粉装置,能够快速清除井底煤粉.基于射流泵理论和能量守恒定律,采用洛伦兹混合损失模型,推导出该排煤粉装置的基本性能方程,并综合举升最小压力比,气蚀最大流量比以及效率最优面积比3种约束条件,对装置的具体性能进行了研究.研究结果表明:井深1 000m以上的煤层气井要求举升最小压力比达到0.75以上;面积比和动力液压力越小,井底压力越大,气蚀最大流量比就越大;效率最优面积比为0.27,面积比越大最优流量比越小.最后根据不同井况,在给定动力液压力和流量条件下,设计了喷嘴和喉管尺寸组合.
Aimed at the problems of coal particles deposition at the bottom of coalbed methane wells and the like, it is proposed that the negative pressure jet jet pulverizer can be used to remove pulverized coal quickly by utilizing the negative pressure adsorption principle of jet pump and the double-layer concentric column structure. Based on the theory of jet pump and the law of conservation of energy, the Lorentz mixing loss model is used to derive the basic performance equation of the pulverized coal discharge unit, and comprehensively raise the minimum pressure ratio, the maximum flow ratio of cavitation and the optimal area ratio 3 The results show that the CBM wells with a depth of 1000m or more require that the minimum lifting pressure ratio be more than 0.75; the smaller the area ratio and the hydrodynamic pressure, the larger the bottom hole pressure, and the higher the bottom hole pressure The greater the ratio of the maximum flow rate of erosion is, the ratio of the optimal efficiency area is 0.27, and the larger the area ratio is, the smaller the optimal flow rate is. Finally, according to different well conditions, under the given dynamic hydraulic pressure and flow conditions, Size combinations.