气藏工程气藏工程气藏工程 (20).pdf

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1、 3.7 Material Balance methodFor Volumetric Geopressured Gas Reservoir for abnormally or geopressured reservoir:the changes in rock and water compressibility may be important and should be considered in material-balance calculations.Volume changing of:p gasp rockp water1 Volumetric Geopressured Gas R

2、eservoir2 Physical modelfwpgiVVBGGGBgIncrease in pore volume occupied by connate waterIncrease in pore volume occupied by reservoir rocks3 Material Balance MethodpVVpVVcwwiTwww11ppVcpVcViwiwwiwwgiGBwiS1wiS=wiVwigiwiiwwSGBSppcV1pVcVpifpTppfpVVc1pVVcppif1ippp)1(wigipiSGBVfwigiifpVSGBppcV1)(wigiiffSGBp

3、pcV13 Material Balance MethodfwpgiVVBGGGBgwigiifwigiwiiwgpgiSGBppcSGBSppcBGGGB11fwiwwigiigpgicScSGBppBGGGB13 Material Balance MethodggiwiifwiwpBBSppcScGGG11zppzBBiiggiGGzpzpSppcSczppiiiiwiifwiw113 Material Balance Methodslope:Gzpiiintercept:iizpp/z=0,Gp=GGGzpzpSppcSczppiiiiwiifwiw113 Material Balanc

4、e Method For the following data taken from a abnormally pressured reservoir,estimate the original gas in place using the material-balance equation.In addition,use the material balance equation for a normally pressured gas reservoir,and compare the initial gas estimated from these two equations.(After Lee et al)1616105.1924.0102.39507psicSpsicpsiapfwiwi4 Example4 Example4 ExampleThank you for your attention!