Question

Match LIST I with LIST II
\[ \begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \hline A. \ \text{Cable tool drilling} & I. \ \text{No strainer} \\ B. \ \text{Well development} & II. \ \text{Bailer} \\ C. \ \text{Cavity well} & III. \ \text{Effective well diameter} \\ D. \ \text{Gravel pack} & IV. \ \text{Surging} \\ \hline \end{array} \]
Choose the correct answer from the options given below:

• A. A-I, B-III, C-II, D-IV
• B. A-III, B-IV, C-I, D-II
• C. A-II, B-IV, C-I, D-III
• D. A-II, B-I, C-III, D-IV

Hint:

Link well construction concepts: - Cable tool uses a \textbf{Bailer}. - Development is done by \textbf{Surging}. - Cavity wells don't need a \textbf{strainer}. - Gravel pack increases the \textbf{effective diameter}.

Answer 1

The Correct Option is C

Step 1: Match each well-drilling term in LIST I with its correct association in LIST II.
- A. Cable tool drilling: This is a percussion drilling method where a heavy drill bit is repeatedly lifted and dropped to crush the formation. The crushed material (cuttings) is removed from the borehole using a II. Bailer.
- B. Well development: This is the process of cleaning the area around the well screen after drilling to remove fine particles and improve water flow into the well. IV. Surging (forcing water to flow in and out of the screen) is a common technique for well development.
- C. Cavity well: This type of well is constructed in unconsolidated aquifers that are overlain by a hard, impermeable layer. A cavity is created in the aquifer material at the bottom of the well, which then fills with water. These wells are often cased down to the cavity and do not use a screen or strainer. They are associated with I. No strainer.
- D. Gravel pack: This involves placing a layer of coarse, uniform gravel or sand around the well screen. This filter material prevents fine particles from the aquifer from entering the well and also increases the hydraulic efficiency of the well, creating a larger III. Effective well diameter.
Step 2: Compile the correct pairings.
- A \(\rightarrow\) II
- B \(\rightarrow\) IV
- C \(\rightarrow\) I
- D \(\rightarrow\) III
This combination corresponds to option (C).