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Which is the fastest method of drilling and especially useful in unconsolidated formations?

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+1 vote
in Irrigation Engineering by (75.2k points)
Which is the fastest method of drilling and especially useful in unconsolidated formations?

(a) Cable tool method

(b) Water-jet boring method

(c) Hydraulic Rotary method

(d) Reverse Rotary method

I got this question in a job interview.

Question is from Tube Well-1 topic in chapter Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

1 Answer

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by (106k points)
Right choice is (c) Hydraulic Rotary method

To explain I would say: Hydraulic rotary method can handle hard and soft foundations with ease and the danger of accidents is lesser. The rate of drilling by this method for consolidated rock formation may vary from 10 to 15 m per day and in unconsolidated formations 100 to 150 m per day.

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