HW 8 Solutions - 1 PGE 312 Physical and chemical Behavior...

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1 PGE 312 Physical and chemical Behavior of Fluids Home Work 8 Solutions Problem 10-4 Gas –oil ratio at separator and stock tank conditions are calculated as follows. Separator gas-oil ratio = = 541.6 Stock tank gas-oil ratio = = 176.75 Gas-oil ratio is now calculated based on stock tank oil at standard conditions. Separator gas-oil ratio = = 602.25 Separator gas-oil ratio = = 177.99 Formation volume factor of oil = = = 1.483 Separator and stock tank shrinkage factors are now calculated Separator volume factor = = 1.112 Stock tank volume factor = = 1.007 The stock tank liquid specific gravity in o API is o API --- (1) Specific gravity of stock-tank oil γ o = 0.823 Substituting γ o into equation (1), we get API gravity = 40.43 o API
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2 Separator Pressure, psig Separator Temperature o F Gas-oil ratio (1 * ) Gas-oil ratio (2 * ) Stock tank gravity o API Formation Volume factor (3 * ) Separator Volume factor (4 * ) Specific gravity of flashed gas 200 to 0 75 541.6 602.25 1.112 0.732 75 176.75 177.99 40.43 1.483 1.007 1.329 Σ 780.24 *Please refer to page 265 for details Problem 10-6 Formation volume factor of oil at bubble point using separator conditions of 200 psig and 75 o F 1.483 from Page #:265 Status of the well at the time of sampling Shut in 72 hours Mole fraction of nitrogen in separator gas for 100 psig , 75 o F 0.0032 from Page #:267 Gravity ( o API) of the stock tank oil from the 100 psig, 75 o F 40.7 from Page #:267 Gravity ( o API) of the residual oil from the differential vaporization 35.1 o API from Page #:263 Gross heating value of the gas from the 200 psig separator 1236 BTU from Page #:268 Molecular weight of the heptanes plus fraction of the reservoir liquid 218 from Page #: 260 Coefficient of isothermal compressibility of the reservoir liquid at 220 o F and 4500 psig 13.48 x 10 -6 psi -1 from Page #: 261 Separator temperature actually occurring in the field 75 o F from Page #: 259
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HW 8 Solutions - 1 PGE 312 Physical and chemical Behavior...

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