1. We have a reservoir which is 400 acres and 40 ft thick. The porosity is 18% a
ID: 286755 • Letter: 1
Question
1. We have a reservoir which is 400 acres and 40 ft thick. The porosity is 18% and the water saturation is 23%. There is oil but no gas. The Oil Formation Volume Factor is (B) 1.12 RBL/STE a. Calculate i. Bulk Volume (BBL) ii. Pore Volume (BBL) iii. HCPV (Hydrocarbon Pore Volume) (BBL) iiii. OOIP (original Oil in Place) 1. In RBL (barrels at reservoir condition) 2. In STB (stock tank barrels) v. Amount of water in reservoir. b. If we determine in a lab test that the residual oil saturation to a waterflood is 10%, calculate: i. The recovery factor RF (oil to be produced/oil present) ii. The STB of oil to be produced.Explanation / Answer
1. Given, Area (A) = 400 acre, thickness (h) = 40 ft
Porosity(n) = 0.18 , Water saturation (Sw) = 0.23
Oil Formation Volume Factor(B0) = 1.12 RBL/STB
a. i. Bulk volume (V) = A * h = 400 * 40 * 7758 BBL (7758 conversion factor of acre-ft to BBL)
= 124,128,000 BBL
ii. Pore volume = V * n = 124,128,000 * 0.18
= 22,343,040 BBL
iii. HCPV = V * n (1- Sw) = 22,343,040 * (1-0.23)
= 17,204,140.8 BBL
iv. Original Oil in Place (OOIP) = A *h * n * (1-Sw) * 7758 / B0
= 400 * 40 * 0.18 * (1- 0.23) * 7758 / 1.12
= 15,360,840 RBL
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.