PROBLEM 3 AND PROBLEM 4

EQUATION 5.43

QUESTION

If the porosity = 0.16 and permeability = 0.120 darcy for the core in Problem 4, calculate the J-function vs. saturation for the system, and show the graph.

3. Assume that the following data were obtained by injection of mercury [0 = 465 x 103 N/m] into a core having a total pore volume of 2.8 cm3 at 20C: Sw Pc (psi) 3 4 7 11 19 36 56 78 1.00 0.88 0.70 0.58 0.40 0.25 0.19 0.19 (a) What is the value of the threshold pressure, the maximum pore size, and the minimum pore size that can conduct a fluid? (b) Determine the pore size distribution and show all graphs used. 4. If the capillary pressure data given in Problem 3 was obtained from oil displacing water in a centrifuge, where Pc is the core inlet pressure and Sw is the average water saturation, calculate the following: (a) The core inlet saturation vs. the inlet capillary pressure, using Equation 5.43. (b) Plot Pci vs. S; and determine the threshold pressure. (c) Compute the vertical saturation profile if the water-oil contact occurred at 2,000 feet (Pw - po = 0.180 g/cm3). (d) What is the meaning of cavitation when used with respect to centrifuge determination of capillary pressure? ds Si =d[d(Pc) * 5 * (P)] = 5 x (P); X = (5.43) d(PC)