HOMEWORK# 8 SOLUTION KEY 10-4. First calculate gas oil ratio at separator and stock-tank conditions. Separator gas-oil ratio 60.51383 scf(150.833)(6.2910bbl/cc)x−== 541.6 scf/ SP bbl Stock-tank gas-oil ratio 60.15186 scf(136.591)(6.2910bbl/cc)x−== 176.75 scf/ ST bbl Second, calculate gas-oil ratio based on stock-tank oil at standard conditions. Separation gas-oil ratio 60.51383 scf(135.641)(6.2910bbl/cc)x−== 602.25 scf/ STB Stock tank gas-oil ratio 60.15186 scf(135.641)(6.2910bbl/cc)x−== 177.99 scf/ STB Third, calculate formation volume factor of oil. osbvolume of liquid expelled from the cellBvolume of liquid arriving in the stock tank=osb201.156 res ccB135.641 ST cc== 1.483 res bbl/STB Fourth, calculate separator and stock-tank shrinkage factors. Separator shrinkage factor 150.833 res cc135.641 ST cc== 1.112 SP bblSTBStock-tank shrinkage factor = 136.591 cc135.641 cc= 1.007ST bblSTBFifth, convert specific gravity of stock –tank oil ºAPI ºAPI = 0141.5131.5γ−ºAPI = 141.5131.50.823−= 40.432
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