The paper introduces a data transmission method for wireless testing of oilwell underpit parameters (pressure and temperature) and low power consuming control circuits of underpit emission devices.
介绍一种油井井下参数（压力、温度）无线测试的数据信息传输方法及井下发射装置低功耗控制电路。
The pneumatic-hydraulic composite transmission system with two-step output liquid pressure automatic switchover from low pressure and mass flow to high pressure and little flow.
具有双级液体压力输出的气—液复合传动系统，能实现低压大流量到高压小流量的自动切换。
The pneumatic-hydraulic composite transmission system with two-step output liquid pressure automatic switchover from low pressure and mass flow to high pressure and little flow.
具有双级液体压力输出的气—液复合传动系统，能实现低压大流量到高压小流量的自动切换。
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