Question:
Three different pressure profiles are shown in the figure. CSD is the Casing Setting Depth.
Match the entries in GROUP I with the entries in GROUP II.
\begin{tabular}{|c|c|}
\hline
GROUP I & GROUP II
\hline
(P) Profile 1 & (I) Reduced wellbore integrity due to weak formation
(Q) Profile 2 & (II) Reduced wellbore integrity due to weak casing
(R) Profile 3 & (III) Full wellbore integrity
\hline
\end{tabular}
\begin{center}
\includegraphics[width=0.7\textwidth]{06.jpeg}
\end{center}
Three different pressure profiles are shown in the figure. CSD is the Casing Setting Depth.
Match the entries in GROUP I with the entries in GROUP II.
\begin{tabular}{|c|c|}
\hline
GROUP I & GROUP II
\hline (P) Profile 1 & (I) Reduced wellbore integrity due to weak formation
(Q) Profile 2 & (II) Reduced wellbore integrity due to weak casing
(R) Profile 3 & (III) Full wellbore integrity
\hline \end{tabular} \begin{center} \includegraphics[width=0.7\textwidth]{06.jpeg} \end{center}
\hline (P) Profile 1 & (I) Reduced wellbore integrity due to weak formation
(Q) Profile 2 & (II) Reduced wellbore integrity due to weak casing
(R) Profile 3 & (III) Full wellbore integrity
\hline \end{tabular} \begin{center} \includegraphics[width=0.7\textwidth]{06.jpeg} \end{center}
Show Hint
When comparing pressure profiles:
- Crossing fracture strength line → weak formation.
- Crossing casing burst line → weak casing.
- Staying within safe limits → full wellbore integrity.
Updated On: Aug 24, 2025
- P – I; Q – II; R – III
- P – II; Q – III; R – I
- P – III; Q – I; R – II
- P – II; Q – I; R – III
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The Correct Option is A
Solution and Explanation
Step 1: Recall what each curve represents.
- \(C1\): Resulting burst pressure (solid line with dots). - \(C2\): Pressure inside casing/open hole. - \(C3\): Burst strength of casing (dotted line). - \(C4\): Fracture strength (dashed line). For wellbore integrity: - The pressure profile must remain within casing strength (C3) and fracture limit (C4). - Any crossing/violation indicates reduced integrity. Step 2: Profile 1 analysis.
In Profile 1, the operating pressure line approaches and exceeds fracture strength line (C4). This means the formation cannot hold pressure → failure due to weak formation. \[ \Rightarrow \text{Profile 1 → Reduced wellbore integrity (weak formation)}. \] Step 3: Profile 2 analysis.
In Profile 2, the operating pressure line approaches the casing burst strength (C3). This means casing fails before the formation → failure due to weak casing. \[ \Rightarrow \text{Profile 2 → Reduced wellbore integrity (weak casing)}. \] Step 4: Profile 3 analysis.
In Profile 3, the operating pressure lies safely between casing strength (C3) and fracture strength (C4). This indicates that both casing and formation are safe → full wellbore integrity. \[ \Rightarrow \text{Profile 3 → Full wellbore integrity}. \] Step 5: Match results.
- P (Profile 1) → I (weak formation). - Q (Profile 2) → II (weak casing). - R (Profile 3) → III (full integrity). Final Answer: \[ \boxed{\text{(A) P – I; Q – II; R – III}} \]
- \(C1\): Resulting burst pressure (solid line with dots). - \(C2\): Pressure inside casing/open hole. - \(C3\): Burst strength of casing (dotted line). - \(C4\): Fracture strength (dashed line). For wellbore integrity: - The pressure profile must remain within casing strength (C3) and fracture limit (C4). - Any crossing/violation indicates reduced integrity. Step 2: Profile 1 analysis.
In Profile 1, the operating pressure line approaches and exceeds fracture strength line (C4). This means the formation cannot hold pressure → failure due to weak formation. \[ \Rightarrow \text{Profile 1 → Reduced wellbore integrity (weak formation)}. \] Step 3: Profile 2 analysis.
In Profile 2, the operating pressure line approaches the casing burst strength (C3). This means casing fails before the formation → failure due to weak casing. \[ \Rightarrow \text{Profile 2 → Reduced wellbore integrity (weak casing)}. \] Step 4: Profile 3 analysis.
In Profile 3, the operating pressure lies safely between casing strength (C3) and fracture strength (C4). This indicates that both casing and formation are safe → full wellbore integrity. \[ \Rightarrow \text{Profile 3 → Full wellbore integrity}. \] Step 5: Match results.
- P (Profile 1) → I (weak formation). - Q (Profile 2) → II (weak casing). - R (Profile 3) → III (full integrity). Final Answer: \[ \boxed{\text{(A) P – I; Q – II; R – III}} \]
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