Assignment Help With The material Balance Method

The material Balance Method

If enough production-pressure history is available for a gas reservoir, the initial gas in place G, the initial reservoir pressure pi, and the gas reserves can be calculated without knowing A, h, f, or Sw. This is accomplished by forming a mass or mole balance on the gas as:

np = ni - nf

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np = moles of gas produced

ni = moles of gas initially in the reservoir

nf = moles of gas remaining in the reservoir.

Using gas equation in above equation:

the material balance method


Pi = initial reservoir pressure

Gp = cumulative gas production, scf

P = current reservoir pressure

V = original gas volume, ft3

zi = gas deviation factor at pi

z = gas deviation factor at p

T = temperature, °R

We = cumulative water influx, ft3

Wp = cumulative water production, ft3

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