... 粗抽时间roughing time 抽气时间pump-down time 真空系统时间常数time constant of a vacuum system ...
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Shorter pump down time increases productivity.
减少抽气时间，效率更高。
Testing instrument was installed in sampler at heel of hydraulic pump, put into down-hole with pump, and it can examine water cut of formation fluid, save history curves in real time by data memory.
测试仪器安装在水力活塞泵泵芯尾部取样器内，随泵芯投入井下进行测试，可实时检测地层液的含水率情况，利用数据存储器实时保存历史曲线，提供了全天候观测生产过程的手段。
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