CWD Data Analysis & Reporting 2

Question 1

When plotting a well driller's log, which scale is most appropriate for representing formation depths accurately?

Accepted Answer

Linear depth scale

Answer

A linear depth scale provides uniform spacing per unit depth, making it the standard for driller's logs to accurately represent formation thicknesses.

Question 2

A pumping test shows drawdown stabilizes at 45 feet after 4 hours. What does this indicate?

Accepted Answer

Steady-state conditions have been reached

Answer

When drawdown stabilizes, it indicates that the rate of water removed equals the rate of recharge, meaning steady-state conditions have been reached.

Question 3

Which of the following best describes the purpose of a specific capacity calculation?

Accepted Answer

Evaluates well yield per unit of drawdown

Answer

Specific capacity (gpm/ft of drawdown) is used to evaluate how efficiently a well produces water relative to the head loss imposed during pumping.

Question 4

What does an E-log (electric log) primarily measure in a borehole?

Accepted Answer

Electrical resistivity and spontaneous potential of formations

Answer

Electric logs measure the resistivity and spontaneous potential of subsurface formations, helping drillers identify lithology and fluid-bearing zones.

Question 5

On a well completion report, the term 'static water level' refers to:

Accepted Answer

Water level after the pump is shut off and equilibrium is restored

Answer

Static water level (SWL) is the depth to water measured when the well is not being pumped and pressure has fully equilibrated.

(CWD) Certified Well Driller Practice Test

(CWD) Certified Well Driller Practice Test

CWD Data Analysis & Reporting 2