The Moda Reservoir is producing oil and, currently, under waterflooding scheme. Below some data available from this reservoir.
1. Find the saturation functions for both imbibition and drainage processes using:
(a) Johnson Saturation Function
(b) Cuddy et al. Saturation Function
2. Compare the two saturation functions for imbibition and drainage and comment on their accuracies.
3. If we check Leverett and Skelt saturation functions against the given data, which one of the four gives the best fit in estimating reserves?
SW kro kr w plm pcDr 0.06000 1.00000 0.00000 100.000 100.000 0.08000 0.92000 0.00000 49.900 49.000 0.12000 0.77000 0.00001 20.000 33.400 0.14000 0.70000 0.00004 13.800 27.800 0.16000 0.63500 0.00020 9.600 20.800 0.20000 0.51500 0.00100 4.800 18.000 0.24000 0.40700 0.00500 2.200 16.000 0.28000 0.31300 0.02400 0.700 14.100 0.32000 0.22500 0.07000 – 0.100 12.900 0.36000 0.15600 0.10200 – 0.800 12.000 0.40000 0.10000 0.13300 – 1.300 10.100 0.44000 0.05600 0.16500 – 1,800 9.200 0.48000 0.03000 0.19800 – 2.200 8.300 0.52000 0.01580 0.23000 – 2.600 7.500 0.56000 0.00800 0.26400 – 3.000 6.600 0.60000 0.00390 0.30000 – 3.500 6.000 0.64000 0.00190 0.33200 – 4.000 4.800 0.68000 0.00090 0.36400 – 4.600 3.700 0.72000 0.00050 0.39600 – 5.600 2.800 0.76000 0.00020 0.42800 – 7.200 2.100 0.80000 0.00010 0.46000 – 10.000 1.800 0.82000 0 0.47000 – 12.400 1.600 0.84000 0 0.49200 – 40.000 1.200
Fluid Properties (PVT Functions)
Pressure (psi) Bo
Bw
Oi I Water
1,000.00000 1.38300 1.00390 0.55000 0.40000 4,000.00000 1.35300 0.99490 0.55000 , 0.40000 7,000.00000 1.32300 0.98590 0.55000 0.40000 10,000.00000 1.29300 0.97690 0.55000 0.40000 13,000.00000 1.26300 0.96790 0.55000 0.40000 Water density (standard conditions) = 1.0 gm/cc Oil density (standard conditions) = 0.95078 gm/cc
