WATER WELL DRILLING 101 FOR GENERAL
EXAM QUESTIONS WITH 100% CORRECT
ANSWERS!!
Well construction is comprised of the following componets? Answer - drilling,
installation of casing, placing well screens, grouting, DEVELOPMENT
Minimum grouting distance? Answer - 10' is code
Artesian Well Answer - Artesian pressure is the result of gravity and the
confining Aquifer
Artesian Well Layers Answer - CONFINING Layer (top)
CONFINED AQUIFER (middle)
IMPERMEABLE Layer (bottom)
Types of drilling techniques Answer - Cable tool, Air rotary, Mud rotary,
Reverse circulation rotary, Jetting & Driving
GROUTING Answer - IS THE ACT OF INJECTING CERTAIN SUBSTANCES INTO
VOID SPACE TO REDUCE OR ELIMINATE THEIR PERMEABILITY, CONSOLIDATE OR
INCREASE THEIR STRENGTH.
(Filling space between the casing and bore hole with cement or clay)
Methods of Grouting include Answer - Tremie pipe outside casing,
Tremie pipe inside casing,
, Casing method or Halliburton method
Neat Cement Ratio Answer - Cement and Water, 5.5 to 6gal of h20 to 1 cubic
foot of Portland cement with 3% bentonite to prevent shrinkage
Tremie Pipe Outside Casing Answer - Grout placed through small pipe outside
casing,
Centering guides are placed along length of casing,
Lower end of casing has drillable plug,
Casing held down by rig so it doesn't float,
Shallow wells a positive displacement pump can be used.
Tremie Pipe Inside Casing Answer - Grout Pipe installed temporarily inside
casing,
Cement plug or float attached at the bottom of the casing,
Casing is filled with water and grout pumped through pipe,
Casing must be cleaned of all debris after grouting
Well Screens Answer - Filtering device allowing water while holding back sand,
.006 TO .250
Important Screen Functions Answer - EASILY DEVELOPED,
MINIMAL INCRUSTING TENDENCY,
LOW HEAD LOST THROUGH SCREEN,
CONTROLS SAND PUMPING IN MANY DIFFERENT AQUIFERS
EXAM QUESTIONS WITH 100% CORRECT
ANSWERS!!
Well construction is comprised of the following componets? Answer - drilling,
installation of casing, placing well screens, grouting, DEVELOPMENT
Minimum grouting distance? Answer - 10' is code
Artesian Well Answer - Artesian pressure is the result of gravity and the
confining Aquifer
Artesian Well Layers Answer - CONFINING Layer (top)
CONFINED AQUIFER (middle)
IMPERMEABLE Layer (bottom)
Types of drilling techniques Answer - Cable tool, Air rotary, Mud rotary,
Reverse circulation rotary, Jetting & Driving
GROUTING Answer - IS THE ACT OF INJECTING CERTAIN SUBSTANCES INTO
VOID SPACE TO REDUCE OR ELIMINATE THEIR PERMEABILITY, CONSOLIDATE OR
INCREASE THEIR STRENGTH.
(Filling space between the casing and bore hole with cement or clay)
Methods of Grouting include Answer - Tremie pipe outside casing,
Tremie pipe inside casing,
, Casing method or Halliburton method
Neat Cement Ratio Answer - Cement and Water, 5.5 to 6gal of h20 to 1 cubic
foot of Portland cement with 3% bentonite to prevent shrinkage
Tremie Pipe Outside Casing Answer - Grout placed through small pipe outside
casing,
Centering guides are placed along length of casing,
Lower end of casing has drillable plug,
Casing held down by rig so it doesn't float,
Shallow wells a positive displacement pump can be used.
Tremie Pipe Inside Casing Answer - Grout Pipe installed temporarily inside
casing,
Cement plug or float attached at the bottom of the casing,
Casing is filled with water and grout pumped through pipe,
Casing must be cleaned of all debris after grouting
Well Screens Answer - Filtering device allowing water while holding back sand,
.006 TO .250
Important Screen Functions Answer - EASILY DEVELOPED,
MINIMAL INCRUSTING TENDENCY,
LOW HEAD LOST THROUGH SCREEN,
CONTROLS SAND PUMPING IN MANY DIFFERENT AQUIFERS
