NGWA - Study Questions - General Drilling Exam
questions with verified answers
(T/F) A drilling fluid should do all of the following:
1. Cool the bit.
2. Promote longevity.
3. Remove cuttings from the bit surface.
4. Transport cuttings to the surface.
5. Plug lost circulation zones.
6. Promote hole stability. Ans✓✓✓ True.
(T/F) A well may be used as sewage disposal site only if it is cased to the
bottom of the borehole. Ans✓✓✓ False.
(T/F) A well which is finished completely underground, for example a
pitless adaptor, does not need a sanitary surface seal. Ans✓✓✓ False.
(T/F) Aquifer development is not an effective way to increase yields
substantially. Ans✓✓✓ False.
(T/F) Cable tool rigs are advantageous for the following reasons:
1. Straightness of well.
2. Minimum maintenance.
3. Economical Use. Ans✓✓✓ True.
, (T/F) Drilling mud viscosity can be accurately estimated by visual
inspection. Ans✓✓✓ False.
(T/F) Dry cement may be mixed with water in the annulus to form an
acceptable surface seal. Ans✓✓✓ False.
(T/F) Gravel-packed wells should be sealed at the top of the gravel pack
as well as in the annulus. Ans✓✓✓ True.
(T/F) Ground water, like surface water, has a tendency to flow downhill.
Ans✓✓✓ True.
(T/F) More than 90% of our nation's fresh water is underground?
Ans✓✓✓ True.
(T/F) State or federal laws dictate the minimum length of grout
required for various casing diameters for certain types of wells.
Ans✓✓✓ True.
(T/F) The size of annular space required for grouting depends on how
the well was drilled. Ans✓✓✓ True.
questions with verified answers
(T/F) A drilling fluid should do all of the following:
1. Cool the bit.
2. Promote longevity.
3. Remove cuttings from the bit surface.
4. Transport cuttings to the surface.
5. Plug lost circulation zones.
6. Promote hole stability. Ans✓✓✓ True.
(T/F) A well may be used as sewage disposal site only if it is cased to the
bottom of the borehole. Ans✓✓✓ False.
(T/F) A well which is finished completely underground, for example a
pitless adaptor, does not need a sanitary surface seal. Ans✓✓✓ False.
(T/F) Aquifer development is not an effective way to increase yields
substantially. Ans✓✓✓ False.
(T/F) Cable tool rigs are advantageous for the following reasons:
1. Straightness of well.
2. Minimum maintenance.
3. Economical Use. Ans✓✓✓ True.
, (T/F) Drilling mud viscosity can be accurately estimated by visual
inspection. Ans✓✓✓ False.
(T/F) Dry cement may be mixed with water in the annulus to form an
acceptable surface seal. Ans✓✓✓ False.
(T/F) Gravel-packed wells should be sealed at the top of the gravel pack
as well as in the annulus. Ans✓✓✓ True.
(T/F) Ground water, like surface water, has a tendency to flow downhill.
Ans✓✓✓ True.
(T/F) More than 90% of our nation's fresh water is underground?
Ans✓✓✓ True.
(T/F) State or federal laws dictate the minimum length of grout
required for various casing diameters for certain types of wells.
Ans✓✓✓ True.
(T/F) The size of annular space required for grouting depends on how
the well was drilled. Ans✓✓✓ True.
