Question

Which ONE of the following CANNOT be obtained from pressure transient analysis in well testing?

• A. Formation damage
• B. Average reservoir pressure
• C. Solution gas-oil ratio
• D. Drainage pore volume

Hint:

Pressure transient analysis is powerful for determining reservoir properties like pressure, permeability, and drainage volume, but some properties like solution gas-oil ratio require fluid sampling.

Answer 1

The Correct Option is C

Pressure transient analysis in well testing is used to derive various reservoir characteristics. Let’s look at each option:
- Formation damage can be inferred from pressure transient analysis because it affects the permeability and pressure response.
- Average reservoir pressure is one of the most important outputs of pressure transient analysis, as it can be calculated using pressure data collected during well testing.
- Solution gas-oil ratio (SGR) is typically obtained from fluid sampling and laboratory analysis, not directly from pressure transient testing. SGR is a property that relates the volume of gas dissolved in the oil and requires sampling, not just pressure data.
- Drainage pore volume can be derived from the analysis of pressure data, as it provides information about the volume of the reservoir that contributes to the pressure response.
Thus, the quantity that cannot be obtained directly from pressure transient analysis is the solution gas-oil ratio, and the correct answer is option (C).