Question

Three different pressure profiles are shown in the figure. CSD is Casing Setting Depth.
Match the entries in GROUP I with the entries in GROUP II. 

 

• A. P – I; Q – II; R – III
• B. P – II; Q – III; R – I
• C. P – III; Q – I; R – II
• D. P – II; Q – I; R – III

Hint:

When analyzing pressure profiles, consider the trends in burst pressure, casing pressure, and formation strength. These help in identifying potential risks to the wellbore and understanding the conditions affecting the casing.

Answer 1

The Correct Option is C

The three pressure profiles in the given diagram correspond to different wellbore integrity conditions. Let's analyze the profiles based on the pressure trends shown in the figure:
- Profile 1 has the highest burst pressure and exhibits full wellbore integrity, indicating no significant risk of casing or formation failure. Thus, Profile 1 corresponds to option III, "Full wellbore integrity".
- Profile 2 shows a lower burst pressure and reflects the impact of a weak formation, meaning the casing could be affected by formation instability, corresponding to option I, "Reduced wellbore integrity due to weak formation".
- Profile 3 shows an even lower burst pressure and appears to be affected by a weaker casing, suggesting reduced integrity due to casing failure, corresponding to option II, "Reduced wellbore integrity due to weak casing".
Thus, the matching between the profiles and conditions is:
P – III; Q – I; R – II.