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: Associate each well-drilling term in LIST I with its corresponding description in LIST II.
- A. Cable tool drilling: This is a percussion drilling method that utilizes a heavy drill bit dropped repeatedly to break apart the formation. The resulting crushed material (cuttings) is removed from the borehole using a II. Bailer.
- B. Well development: This process cleans the area surrounding the well screen post-drilling to eliminate fine particles and enhance water inflow. IV. Surging, which involves alternately pushing and pulling water through the screen, is a typical well development technique.
- C. Cavity well: Constructed in unconsolidated aquifers beneath a dense, impermeable layer, these wells feature a cavity formed in the aquifer material at the well's base, which then collects water. Typically, these wells are cased to the cavity and omit a screen or strainer, aligning with I. No strainer.
- D. Gravel pack: This involves surrounding the well screen with a layer of uniformly sized coarse gravel or sand. This filtering material prevents aquifer fines from entering the well and improves the well's hydraulic efficiency, contributing to a larger III. Effective well diameter.
Step 2: Consolidate the correct pairings.
- A \(\rightarrow\) II
- B \(\rightarrow\) IV
- C \(\rightarrow\) I
- D \(\rightarrow\) III
This combination matches option (C).