Question

Match List-I with List-II

List-I	List-II
(A) Cable tool method	(I) crab winch
(B) Hand boring set	(II) hydraulic jack
(C) Anchor bolt method	(III) large size holes
(D) Reverse circulation rotary drilling	(IV) drilling in boulders

Choose the correct answer from the options given below

• (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (I), (B) - (IV), (C) - (II), (D) - (III)
• (A) - (IV), (B) - (I), (C) - (III), (D) - (II)

Hint:

To remember reverse circulation (RC):
In regular rotary drilling, mud goes down the pipe and up the annulus.
In reverse rotary drilling, mud goes down the annulus and up the drill pipe, which is ideal for large-diameter wells.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Constructing deep water wells requires selecting the appropriate drilling method and supporting equipment based on the sub-surface geology, well depth, and desired well diameter.

Step 2: Detailed Explanation:
Let us analyze each pair:
1.Cable tool method (A): This method drills by repeatedly raising and dropping a heavy chisel-shaped bit suspended on a cable.
The high-impact hammering action is highly effective at fracturing hard rock formations and drilling through consolidated gravels and boulder formations (IV) where rotary drilling bits often slip or fail.
Thus, (A) matches with (IV).
2.Hand boring set (B): Hand boring is a manual drilling method used for shallow wells in soft soils.
It uses a manual or motor-assisted crab winch (I) to lift and lower the heavy auger assemblies and casing pipes.
Thus, (B) matches with (I).
3.Anchor bolt method (C): This is a technique used in structural foundations or well-sinking operations.
Anchor bolts are tensioned and tested using high-capacity hydraulic jacks (II) to secure structures or pull casings.
Thus, (C) matches with (II).
4.Reverse circulation rotary drilling (D): In this method, the drilling fluid flows down the annular space between the borehole wall and the drill pipe, carrying drill cuttings up through the inside of the hollow drill pipe.
It uses high flow velocities, making it highly effective for drilling large-diameter holes (III) in unconsolidated formations without borehole wall collapse.
Thus, (D) matches with (III).
Combining these matches:
\[ \text{(A)-(IV), (B)-(I), (C)-(II), (D)-(III)} \]

Step 3: Final Answer:
The correct matching sequence is (A) - (IV), (B) - (I), (C) - (II), (D) - (III).