List of top Petroleum Engineering Questions on Reservoir Engineering

Oil is produced from an undersaturated oil reservoir that has no initial gas cap. The reservoir rock compressibility and connate water saturation effects are considered negligible. There is no water influx into the reservoir and no water production. The initial oil formation volume factor was 1.24 RB/STB. After producing the reservoir for a short period, while the reservoir pressure is still above the bubble point pressure, the oil formation volume factor changed to 1.25 RB/STB. The calculated oil recovery factor (in fraction, rounded to three decimal places) is ________.

One dimensional oil flow occurs in a horizontal porous medium of length 2000 ft, with a constant cross sectional area of 6000 ft\(^2\) and absolute permeability of 50 mD. The oil has a viscosity of 2 cP and flows along the length of the medium. The pressure at the inlet is 2500 psig and at the outlet is 2200 psig. Using Darcy's equation for single phase, linear flow, the flow rate of oil (in bbl/day, rounded to one decimal place) is _______. [1 bbl = 5.61 ft\(^3\)]

Real gas pseudo pressure is used to derive the diffusivity equation for a highly compressible fluid, for which viscosity \(\mu\) and gas compressibility factor \(Z\) are functions of pressure \(p\). Which of the following represents the partial derivative of the real gas pseudo pressure with respect to time \(t\)?

Pressure (p) as function of radius (r) and time (t) can be found from the analytical solution of radial diffusivity equation for homogenous and isotropic reservoir following Darcy law. For this solution, if dp/dt is treated as constant, which of the following correctly describe(s) the state(s) of pressure change?

For a single-phase dry gas reservoir having a well producing only dry gas, \(E\) represents gas expansion factor and \(B_g\) represents gas formation volume factor. Which of the following options is CORRECT?