## The following PVT and production history data are available on an oil reservoir in UMAT: Original oil in place = 10 MMSTB Initial water saturation = 22% Initial reservoir pressure = 2496 psi Bubble-point pressure = 2496 psi Pressure B. R, BE Ho GOR (psi) (bbl/STB) (scf/STB) (bbl/scf) (cp) (cp) (scf/STB) 2496 1.325 0.000796 0.906 0.016 650 1498 1.250 486 0.001335 1.373 0.015 1360 1302 1.233 450 0.001616 1.437 0.014 2080 650 Given that the oil production at 1498 psi and 1302 psi are 1.38 MMSTB and 2.26 MMSTB respectively, Calculate: i. Pore volume ii. Oil and gas saturations at 1498 and 1302 psi Volume of gas produced at 1498 and 1302 psi iv. Relative permeability ratio (kg/ko) at 1302 psi (9 marks)

EXPERT ANSWER All the equations used in this answer are taken from Advanced Reservoir Engineering by Tarek Ahmed (Chapter 5) i) Pore Volume = NBoi/(1-Swi) N = 10 MM STB Boi = 1.325 bbl/STB Swi = 0.22 Therefore, applying these values in the equation, we finally get, Pore Volume = 16.987 MM bbl ii) So = (1 – …