Question

Which of the following option(s) is/are CORRECT for well testing analysis of a reservoir?

• A. Permeability, skin and reservoir geometry are calculated using data from pseudo steady state.
• B. Permeability, skin and reservoir geometry are calculated using data from transient state.
• C. Reservoir geometry is calculated using data from pseudo steady state.
• D. Absolute open flow potential is calculated from back pressure test for a gas well.

Hint:

In well testing analysis, pseudo steady state is useful for estimating reservoir geometry and skin, whereas transient state data is used for calculating permeability. For gas wells, back pressure tests are essential for estimating absolute open flow potential.

Answer 1

The Correct Option is C, D

- Option (A): Permeability, skin, and reservoir geometry are commonly calculated using data from the transient state, not pseudo steady state. The transient state provides dynamic data useful for these calculations.
- Option (B): This is incorrect because the pseudo steady state is typically used to calculate reservoir parameters like permeability, skin, and geometry.
- Option (C): Reservoir geometry can be calculated using data from the pseudo steady state, as it provides a stable pressure profile, which helps to evaluate the geometry of the reservoir. This is the correct approach.
- Option (D): The absolute open flow potential is determined from a back pressure test for a gas well. This is the correct method for estimating the flow potential of a gas well.
Thus, the correct answers are (C) and (D).