Pseudo Steady State
Definition - What does Pseudo Steady State mean?
Pseudo Steady State is the period in which hydrocarbons in a reservoir flow in a steady state into the well. It can also be referred to as the “stabilized” flow condition from a bounded drainage area. In a Pseudo Steady flow, the pressure at various locations in the reservoir linearly declines as a function of time and remains constant at every point.
Petropedia explains Pseudo Steady State
A Pseudo Steady state flow condition can be expressed mathematically in the following formula:
This means that the change in the rate of pressure with respect to time at every point in a reservoir is constant.
In a constant production rate, the difference between the pressure created by the fluid flowing in a wellbore and reservoir pressure in the drainage area remains constant. This results in a uniform slope when plotted on a Cartesian plot.
There are three types of flow regimes which describes the behavior of fluid flow through a reservoir
- Steady state flow
- Semi steady state flow
- Unsteady state flow
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