For gas reservoirs, the material balance concept can be applied to determine gas in place and expected gas reservoir reserve.
Gas Production = Expansion of Free Gas In Reservoir
Assumption:
Where;
Gp = gas production (std cu-ft)
Bg = gas formation volume factor (res cu-ft/std cu-ft)
G = gas in place (std cu-ft)
Bgi = initial formation volume factor (res cu-ft/std cu-ft)
Gas formation volume factor (Bg)
This article will demonstrate a material balance equation in a natural water drive mechanism. A full material balance equation is shown below:
Figure 1 – Full Material Balance Equation
Assumptions
Figure 2 – Material Balance Equation with Assumption for a Natural Water Drive Mechanism
This article will demonstrate a material balance equation in gas cap drive mechanism. First, we start with a full material balance equation.
Figure 1 – Full Material Balance Equation
Assumptions
Crude oil properties are important for us to understand what they mean and how they will affect us. The most commonly measured properties of crude oil are specific gravity or API gravity, viscosity, color, and odor.
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Material balance equation can be applied for any drive mechanism and this article demonstrates how to apply the material balance equation in a solution drive mechanism. For a solution drive mechanism, there are 2 cases. The first case is when reservoir pressure is above a bubble point and the second case is when reservoir pressure is below a bubble point.
Solution Gas above Bubble Point
Start with a full material balance equation.
Figure 1 – Full Material Balance Equation
Assumptions Continue reading
