NGWA questions with verified answers
National Groundwater Assocation Ans✔✔✔-
Water well defined Ans✔✔✔-Drilled, cored, bored, washed, dug, driven, jetted
excavation, constructed for extracting groundwater.
Cable tool drill string Ans✔✔✔-Socket, jars, stem, and drill bit.
Drill String Ans✔✔✔-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 Ans✔✔✔-Drill bit, Drill collar (stabilizer), Drill pipe, Kelly (top
head)
Porosity Ans✔✔✔-The percentage of void spaces or holes in geologic formation.
The amount of connected pore spaces
Barite Ans✔✔✔-barium sulfate (BaSO4), a mineral used to increase the weight of
drilling fluid (mud); its specific gravity is 4.2
Air Rotary Drilling Ans✔✔✔-a method of rotary drilling that uses compressed air
as the circulating medium; compressed air at high uphole velocity removes the
cuttings
, Surfactants Ans✔✔✔-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 Ans✔✔✔-Unit of energy constant to overcome gravity. Head calculation
2.31 X 40psi = 92.4' of lift. 600' / 2.31 = 260psi
Well Development Ans✔✔✔-a procedure to facilitate the removal of fine solids
and materials from the water-bearing zone of a water well to optimize production
Well Development Methods Ans✔✔✔-Chemical, Over pumping, Rawhiding
(Washing and backwashing), Mechanical Surging, Jetting, Air surging.
Over Pumping Ans✔✔✔-Well Development method; involves pumping well at a
much higher rate than it will be pumped during well evacuation or sampling.
Rawhiding (washing and back washing) Ans✔✔✔-Well Development method,
involves pumping water to the top of the well then allowing it to flow back
through the intake of the pump, breaking up the bridge of sediments only around
the pump intake.
Mechanical Surging Ans✔✔✔-Well Development method, involves attaching a
surging block to the drill rod that fits well inside diameter, then dropping the
block rapidly, forcing the water back up into the surrounding aquifer. In the
recovery stroke water is lifted back into the well allowing fine sediments to flow
from the aquifer.
National Groundwater Assocation Ans✔✔✔-
Water well defined Ans✔✔✔-Drilled, cored, bored, washed, dug, driven, jetted
excavation, constructed for extracting groundwater.
Cable tool drill string Ans✔✔✔-Socket, jars, stem, and drill bit.
Drill String Ans✔✔✔-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 Ans✔✔✔-Drill bit, Drill collar (stabilizer), Drill pipe, Kelly (top
head)
Porosity Ans✔✔✔-The percentage of void spaces or holes in geologic formation.
The amount of connected pore spaces
Barite Ans✔✔✔-barium sulfate (BaSO4), a mineral used to increase the weight of
drilling fluid (mud); its specific gravity is 4.2
Air Rotary Drilling Ans✔✔✔-a method of rotary drilling that uses compressed air
as the circulating medium; compressed air at high uphole velocity removes the
cuttings
, Surfactants Ans✔✔✔-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 Ans✔✔✔-Unit of energy constant to overcome gravity. Head calculation
2.31 X 40psi = 92.4' of lift. 600' / 2.31 = 260psi
Well Development Ans✔✔✔-a procedure to facilitate the removal of fine solids
and materials from the water-bearing zone of a water well to optimize production
Well Development Methods Ans✔✔✔-Chemical, Over pumping, Rawhiding
(Washing and backwashing), Mechanical Surging, Jetting, Air surging.
Over Pumping Ans✔✔✔-Well Development method; involves pumping well at a
much higher rate than it will be pumped during well evacuation or sampling.
Rawhiding (washing and back washing) Ans✔✔✔-Well Development method,
involves pumping water to the top of the well then allowing it to flow back
through the intake of the pump, breaking up the bridge of sediments only around
the pump intake.
Mechanical Surging Ans✔✔✔-Well Development method, involves attaching a
surging block to the drill rod that fits well inside diameter, then dropping the
block rapidly, forcing the water back up into the surrounding aquifer. In the
recovery stroke water is lifted back into the well allowing fine sediments to flow
from the aquifer.
