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Simple Material Balance

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1. Generating a Simple Material Balance

In this module, recovery factors for both oil (\(RF_{oil}\)) and gas (\(RF_{gas}\)) can be calculated with readily available data. The data required for calculating recovery factors is:

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  1. Reservoir Fluid Composition:

    • Choose an Initial reservoir fluid composition (generated with any of the available methods)
    • Input an initial reservoir pressure
    • Input a Reservoir temperature

  2. Surface Process:

    • Edit the surface process associated to the well (used to generate the black oil table)
  3. Material Balance Input:
    • Input an abandonment pressure (\(p_{a}\)) (must be between standard pressure and initial reservoir pressure).
    • Input a Cumulative produced GOR (\(\frac{G_p}{N_p}\)) (has to be higher than the initial GOR of the reservoir fluid, and less than the solution GOR of the equilibrium gas at abandonment conditions).
How is cumulative produced GOR (\(\frac{G_p}{N_p}\)) estimated?

From type curves, numerical simulation or guessing.

2. Recovery Factors

Recovery factor for oil (\(RF_{oil}\)) is defined as produced surface volume of oil (N) divided by original oil in place (N), i.e. \(RF_{oil} = \frac{N_p}{N}\). Recovery factor for gas \(RF_{gas}\) is defined as produced surface volume of gas (G) divided by original gas in place (G), i.e. \(RF_{gas} = \frac{G_p}{G}\).