Reservoir pressure can be divided into normal pressure, abnormal high pressure and abnormal lowpressure in terms of the ratio between formation pressure and hydrostatic pressure.
根据地层压力与静水压力的比值大小，可将地层压力分为异常高压、异常低压和正常压力三种压力状态。
2
Ratio, servo hydraulic pressure technology, low power pneumatic control valve, production of stuffing.
比例、伺服液压技术，低功率气动控制阀，填料密封生产。
3
The results show that , the ratio of the output power of vaneless counter-rotating turbine can reduce 2.6% at the same turbine efficiency when the lowpressure rotor curves positive.