Abstract: The theoretical models for hydraulic parameters of fluidics downhole boost compressor were set up with the fluid mechanics network method on the basis of structure and work principle of the first generation of downhole boost compressor.According to the hydraulic models,the flow rate and pressure of the first generation of boost compressor were computed and analyzed.Some innovative approaches were presented to resolve the problem existing in the first generation of boost compressor by increasing the flow area of fluidics nozzle to decrease pressure drop and erosion attack,adding a new flow path in order to improve boosting effect of the second piston bore,connecting a bypass valve in parallel with throttle valve to set a partial flow and regulate pressure drop.The above innovative approaches are the theoretical base of the second generation of boost compressor and have important roles on decreasing the pressure drop and increasing work performance of boost compressor.

Key words: fluidics downhole boost compressor, hydraulic parameter, network analytic method, throttle valve, annular flow path, model machine, theoretical model

摘要： 基于射流式井底增压器第一代样机结构和工作原理,运用流体力学网络分析方法,建立了射流式井底增压器的水力参数理论模型。利用该模型对第一代样机各部件流量和压力等流动参数进行了计算和分析。针对第一代样机存在的问题,提出了改进措施:①增加射流元件喷嘴过流面积来降低压耗和冲蚀破坏;②在射流元件输出道与二级活塞缸之间增加新流道,提高二级活塞缸增压效果;③在节流阀位置并联旁通阀进行分流稳压。这些改进措施为射流式井底增压器第二代样机的设计定型提供了理论支持,减少了射流式井底增压器压降,改善了射流式井底增压器的工作性能。

关键词: 射流式井底增压器, 水力参数, 网络分析方法, 节流阀, 环形流道, 样机设计, 理论模型