CWD Safety Standards & Practices 2

Question 1

When working near an energized power line during drilling operations, what is the minimum safe approach distance for equipment under 50 kV?

Accepted Answer

10 feet

Answer

OSHA requires a minimum 10-foot clearance from energized power lines up to 50 kV for equipment and workers.

Question 2

A confined space entry permit for a completed well vault must include which of the following?

Accepted Answer

Atmospheric testing results before and during entry

Answer

Atmospheric testing for oxygen, flammable gases, and toxic vapors must be documented before and monitored during confined space entry.

Question 3

Which type of fire extinguisher is appropriate for a Class C electrical fire on a drilling rig?

Accepted Answer

CO2 or dry chemical extinguisher

Answer

Class C fires involving energized electrical equipment require non-conductive extinguishing agents such as CO2 or dry chemical.

Question 4

What is the primary purpose of a Job Hazard Analysis (JHA) before beginning a well drilling project?

Accepted Answer

To identify and mitigate hazards associated with each task step

Answer

A JHA systematically breaks down job tasks to identify potential hazards and establish controls before work begins.

Question 5

Hydrogen sulfide (H2S) gas encountered during drilling is most dangerous because it:

Accepted Answer

Desensitizes the sense of smell at high concentrations, giving no warning

Answer

H2S paralyzes olfactory nerves at concentrations above 100 ppm, making the gas undetectable by smell at dangerous levels.

(CWD) Certified Well Driller Practice Test