1.18 Experiments were made on a bottom-hole sample of the reservoir liquid taken from the LaSalle Oil Field to determine the solution gas and the formation volume factor as function of pressure. The...

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Extracted text: 1.18 Experiments were made on a bottom-hole sample of the reservoir liquid taken from the LaSalle Oil Field to determine the solution gas and the formation volume factor as function of pressure. The initial bottom-hole pressure of the reservoir was 3600 psia, and bottom-hole temperature was 160 °F; so all measurements in the laboratory were made at 160 °F. The following data, converted to practical units, were obtained from the measurements: Solution gas [SCF/STB at Formation Volume Factor Pressure [psia] 14.7 psia and 60 °F] Bbl/STB 3600 567 1.310 3200 567 1.317 2800 567 1.325 2500 $67 1.333 2400 554 1.310 1800 436 1.263 1200 337 1.210 600 223 1.140 200 143 1.070 a) What factors affect the solubility of gas in crude oil? b) Plot the gas in solution versus pressure. c) Was the reservoir initially saturated or undersaturated? Explain d) Does the reservoir have an initial gas cap? e) In the region of 200 to 2500 psia, determine the solubility of the gas from your graph in SCF/STB/psi. n Suppose 1000 SCF of gas had accumulated with each stock tank barrel of oil in this reservoir instead of 567 SCF. Estimate how much gas would have been in solution at 3600 psia. Would the reservoir oil then be called saturated or undersaturated?