The ability to calculate the performance of a gas producing system, including the reservoir and the piping system, requires knowledge of many gas properties at various temperatures & pressures. If the natural gas is in contact with liquids, such as condensate or water, the effect of the liquids on gas properties must be evaluated.
The understanding of the behavior of gases with respect to pressure and temperature changes is made clearer by first considering the behavior of gases at conditions near normal conditions of pressure and temperature, that is:
1 psia = 6894,757 Pa
SPE – society of petroleum engineers
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