NGWA page 5
Could specific capacity be determined in sizing a well screen?
Yes, specific capacity (water yield per unit of drawdown) helps determine the
appropriate screen size to optimize flow and minimize drawdown.
What materials and method for placement of the materials are used in gravel
packed wells?
Materials: Gravel, typically well-sorted and clean.
Methods: Gravity placement, tremie pipe, or reverse circulation to place gravel
uniformly around the well screen.
Explain the difference between natural and artificial gravel packed wells.
Natural gravel pack: Utilizes the existing formation materials for filtration around the
well screen.
Artificial gravel pack: Involves adding specially selected gravel around the well screen
to enhance filtration and stability.
What information can be obtained from electric logging the well?
Electric logging provides information on formation resistivity, porosity, water quality,
and the location of water-bearing zones.
Why is it important to identify the boundaries of an aquifer?
It is important to estimate water supply, manage sustainable extraction, and
prevent over-pumping or contamination from adjacent formations.
What techniques are used to obtain good samples in mud rotary drilling in
unconsolidated formations?
Split-spoon sampling, core sampling, and continuous cuttings collection.
Could specific capacity be determined in sizing a well screen?
Yes, specific capacity (water yield per unit of drawdown) helps determine the
appropriate screen size to optimize flow and minimize drawdown.
What materials and method for placement of the materials are used in gravel
packed wells?
Materials: Gravel, typically well-sorted and clean.
Methods: Gravity placement, tremie pipe, or reverse circulation to place gravel
uniformly around the well screen.
Explain the difference between natural and artificial gravel packed wells.
Natural gravel pack: Utilizes the existing formation materials for filtration around the
well screen.
Artificial gravel pack: Involves adding specially selected gravel around the well screen
to enhance filtration and stability.
What information can be obtained from electric logging the well?
Electric logging provides information on formation resistivity, porosity, water quality,
and the location of water-bearing zones.
Why is it important to identify the boundaries of an aquifer?
It is important to estimate water supply, manage sustainable extraction, and
prevent over-pumping or contamination from adjacent formations.
What techniques are used to obtain good samples in mud rotary drilling in
unconsolidated formations?
Split-spoon sampling, core sampling, and continuous cuttings collection.
