气藏工程气藏工程气藏工程 (10).pdf
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1、Radial Flow of Radial Flow of Compressible GasesCompressible GasesRadial Flow of Compressible GasesThe basic differential form of Darcys Law for a horizontal laminarflow is valid for describing the flow of both gas and liquid systems.For a radial gas flow,the Darcys equation takes the form:The gas f
2、low rate is usually expressed in scf/day.Referring to the gasflow rate at standard condition as Qg,the gas flow rate qgrunderpressure and temperature can be converted to that of standard conditionby applying the real gas equation-of-state to both conditions,ororCombining the above equations,integrat
3、ing and rearranging,givesDefine,It is called the real gas potential or real gas pseudopressure.The above equation can be written in terms of the real gas potential togive:ORThe flow rate is given exactly byIn the particular case when r=re,then:The gas flow rate is commonly expressed in Mscf/day,orwh
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