The SPRD will automatically open as the air pressure in the duct system increases, in order to prevent the reduction of air flow and excessive noise and velocity through the duct system.
当管道系统空气压力增加时，SPRD会自动开启，以防止管道系统中空气流动的减少和过度噪音和速度。
For volumetric gas reservoir, gas well absolute open flow (AOF) is reduced with the decrease of formation pressure.
对于定容气藏，气井的绝对无阻流量随地层压力的下降而降低。
Open flow potential will drop down with decline of formation pressure in a gas well.
随着气井地层压力的下降，其无阻流量相应降低。
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