Question

Four curves designated as I, II, III, and IV are shown in the figure. \( q_f \) is the bottomhole oil flow rate, \( q_s \) is the surface oil flow rate, and \( B_o \) is the oil formation volume factor. Which ONE of the following curves depicts the minimum wellbore storage effect? 

• A. I
• B. II
• C. III
• D. IV

Hint:

When analyzing production curves, the curve showing the least deviation from a straight line typically indicates the minimum wellbore storage effect, representing more efficient flow.

Answer 1

The Correct Option is D

The wellbore storage effect is the temporary accumulation or storage of fluid in the wellbore during production. The minimum wellbore storage effect is typically represented by the curve that exhibits the least deviation from a straight line when the time progresses. The curves shown in the figure represent different behaviors of the flow rate over time with respect to wellbore storage.
- Curve I shows the highest deviation, indicating a significant wellbore storage effect.
- Curve II and Curve III show less deviation, indicating reduced storage effects but still noticeable.
- Curve IV shows the least deviation, indicating the minimum wellbore storage effect. This curve represents the condition where the fluid storage in the wellbore is minimized and the flow is closest to ideal behavior. Thus, the correct option is IV, as it depicts the minimum wellbore storage effect.