1. 461 PE Reservoir Engineering
10/11/1439 AG
461 PE Reservoir Engineering
Instructor
Dr. Ahmed Gawish
461 PE

2. GMBE Initial Oil in Place = NBoi bbl Gas in Place = mNBoi bbl
Remaining Oil = (N-NP)Bo bbl
Gas Cap Vol. at Pr = (mNBoi)(Bg/Bgi) bbl
Evolved gas vol. = ( NRsi-NpRp-(N-Np)RsBg bbl
Net Water Influx = (We-WpBw) bbl
Total Change in Pore Volume =
NBoi (1+m){(Swi Cw +cf)/(1-Swi)} P bbl
Injection Gas = Ginj Bging bbl
Injected Water = Wing Bw bbl

3. GMBE

4. MBE as f(Bt)
Where

5. Driving Indexes

6. Type of Oil Reservoirs 1- Volumetric Undersaturated Oil Reservoirs Or
2- Volumetric Saturated Oil Reservoirs
3- Gas-Cap-Drive Reservoirs
a- Unknown N, Known m:
b- Known N, unknown m:
c- N and m are Unknown :
4- Water-Drive Reservoirs

7. Water-Drive Reservoirs
1-The Pot-Aquifer Model in the MBE
Where:

8. Water-Drive Reservoirs
2- The Steady-State Model in the MBE

9. Water-Drive Reservoirs
3-The Unsteady-State Model in the MBE

10. Tracy’s Form of the Material Balance Equation

11. The MBE as an Equation of a Straight Line (Havlena &Odeh)
Underground Withdrawal
The Expansion of oil and gas
The Expansion of gas cap
The Expansion of water and formation
Havlena &Odeh MBE as Straight line