CWD Risk Assessment & Management 3

Question 1

A well driller discovers H2S gas during drilling. Which action should be taken FIRST?

Accepted Answer

Immediately evacuate personnel upwind and monitor air quality

Answer

H2S is immediately dangerous to life and health (IDLH) at 100 ppm; immediate upwind evacuation and air monitoring are the required first responses.

Question 2

What risk management technique involves transferring financial liability for a drilling project's environmental damage to a third party?

Accepted Answer

Risk transfer via insurance

Answer

Purchasing environmental liability or contractor's pollution liability insurance transfers the financial risk of environmental damage to the insurer.

Question 3

When assessing risk from drilling near a septic system, the primary concern is:

Accepted Answer

Microbial contamination of the aquifer from wastewater

Answer

Septic systems release pathogens and nitrates that can migrate into the aquifer if minimum setback distances are not maintained.

Question 4

In a risk matrix, a hazard rated as 'high likelihood, high severity' should be:

Accepted Answer

Immediately controlled or work halted until controls are in place

Answer

High likelihood combined with high severity places a hazard in the unacceptable risk zone, requiring immediate corrective controls before work proceeds.

Question 5

Which condition on a drilling site most increases the risk of cave-in or borehole instability in unconsolidated formations?

Accepted Answer

Presence of saturated fine sand or silt (running sand conditions)

Answer

Saturated fine-grained soils lose their structural strength and flow into the borehole, creating running sand conditions that risk borehole collapse.

(CWD) Certified Well Driller Practice Test

(CWD) Certified Well Driller Practice Test

CWD Risk Assessment & Management 3