4.5: Field Performance of Oil Reservoirs

To this point in the lesson, we have focused on the performance of individual wells. As reservoir engineers, we are also interested in the overall performance of the reservoir. It is important to note that we cannot simply sum the rates of the individual wells to determine the performance of the reservoir in its entirety. This is because Well Interference (interaction between wells) often occurs in the reservoir, which is not properly accounted for in our individual well analyses. This well interference occurs when the pressure disturbance caused by production from one well travels and comes into contact with the pressure disturbance caused by another well.

4.5: Field Performance of Oil Reservoirs section of this lesson will cover the following topics:

• 4.5.1: Field and Well Performance of Oil Reservoirs by Material Balance
  • 4.5.1.1: Volumetric, Undersaturated Oil Reservoirs
    • 4.5.1.1.1: Material Balance Method for Estimating the Stock Tank Oil Originally In-Place
    • 4.5.1.1.2: Material Balance Method for Making Future Reservoir Predictions
  • 4.5.1.2: Non-Volumetric, Undersaturated Oil Reservoirs
• 4.5.2: Field and Well Performance of Oil Reservoirs by Decline Curve Analysis
  • 4.5.2.1: Field and Well Performance with Arps Decline Curves
    • 4.5.2.1.1: Exponential Decline (b=0)
    • 4.5.2.1.2: Hyperbolic Decline (0<b<1)
    • 4.5.2.1.3: Harmonic Decline (b=1)

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