Define instantaneous gas oil ratio.

PE4511 Name Class Id
⦁ Short answers (3 pts each)
⦁ Please define instantaneous gas oil ratio
⦁ Please define the production gas oil ratio
⦁ Please specify the reasons for the need to adjust oil saturation for gravity drainage drive reservoirs
⦁ Please briefly specify the procedure to adjust oil saturation for water drive reservoirs
⦁ (10 pts) Please plot the solution gas oil ratio and instantaneous gas oil ratio with pressure relations, and explain the changes alone the instantaneous GOR plot.
⦁ (15 pts) A saturated oil reservoir has a bubble point pressure of 2100 psi at 175F. The initial reservoir pressure is 2400 psi, original oil in place is 10 MMSTB, connate water saturation is 15%, porosity is 20%, cw=3.2*10-6 1/psi, cf=3.1*10-6 1/psi. The PVT data is listed in table 1 and relative permeability information is listed in table 2. Please calculate the following:
⦁ The oil compressibility at different pressure using oil formation volume factors
⦁ Cumulative oil and gas production when pressure decreases to 2100 psi, 1800 psi, and 1500 psi.