35
Relative advantages of percussion method of drilling are
(A) . Collection of more precise data
(B) . Detection of thin and weak water bearing zones
(C) . Facility of testing quality and quantity of water as drilling proceeds
(D) . Requires much less water for drilling as compared to direct rotary
Choose the correct answer from the options given below:
EXPLANATION
Water Well Drilling & Construction
- Advantages of Percussion (Cable-Tool) Well Drilling:
- Percussion drilling breaks rock via the reciprocating impact of a heavy chisel bit suspended from a cable:
- Precise lithologic sampling: Cuttings are bailed directly without contamination from drilling mud additives, yielding accurate geologic logs.
- Detection of low-yield aquifers: Because no heavy bentonite drilling mud is used to plaster borehole walls, even thin, low-pressure water-bearing strata are immediately detected.
- Ongoing yield and water quality testing: The bailer permits rapid drawdown and water sampling at successive depths during drilling.
- Low water consumption: Requires only enough water to form a slurry for bailing, unlike direct rotary drilling requiring continuous circulation.
- Conclusion: (A), (B), (C) and (D) (Option 3).
Correct option: (3) (A), (B), (C) and (D).
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