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NGWA EXAM QUESTIONS WITH CORRECT ANSWERS

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Exam (elaborations)

NGWA EXAM QUESTIONS WITH CORRECT ANSWERS

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62 pages

2025/2026

Institution NGWA - General Drilling

Course NGWA - General Drilling

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NGWA EXAM QUESTIONS WITH CORRECT ANSWERS

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NGW A /

EXAM
/ /

QUESTIONS
/ /

W ITH CORRECT ANSW ERS
/ // // //

Water well defined
// //

Drilled, /

cored,
/ /

bored,
/ /

washed,
/ /

dug,
/ /

driven,
/ /

jetted
/ /

excavation, constructed for extracting groundwater.
/ // // // //

Cable tool drill string
// // //

Socket, jars, stem, and drill bit.
// // // // //

Drill String
//

Entire /

column
/ /

,/ of/

/ string /

/ or/

/ drill /

/ pipe,drill /

/ collars, /

/ and /

/ accessories /

/ that /

/ transmit /

/ fluid /

/ and/or /

/ rotational /

/ power /

/ from Kelly(top head drive) to the drill collars and bit.
// // // // // // // // //

Rotary Drill string // //

Drill bit, Drill collar (stabilizer), Drill pipe, Kelly (top head)
// // // // // // // // //

Porosity
The /

percentage
/ /

of
/ /

void
/ /

spaces
/ /

,/ or /

/ holes /

/ in /

/ geologic /

/ formation. The amount of connected pore spaces // // // // // //

Barite
barium /

sulfate
/ /

(BaSO4),
/ //

a /

mineral
/ /

used
/ /

to
/ /

increase
/ /

the weight of drilling fluid (mud); its specific gravity is 4.2
/ // // // // // // // // // //

Air Rotary Drilling
// //

a /

method
/ /

of
/ /

rotary
/ /

drilling
/ /

that
/ /

uses
/ /

, / compressed /

/ air /

/ as /

/ the /

/ circulating /

/ medium; /

/ compressed /

/ air at high uphole velocity removes the cuttings
// // // // // // //

Surfactants
Improve flushing of cuttings from bit. Used in air-
// // // // // // // //

based /

drilling
/ /

to
/ /

produce
/ /

foam
/ /

during
/ /

well drilling, also well development to disaggregate clays
/ // // // // // // //

2.31
Unit /

of
/ /

energy
/ /

constant
/ /

to
/ /

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Uploaded on: February 2, 2026
Number of pages: 62
Written in: 2025/2026
Type: Exam (elaborations)
Contains: Questions & answers

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