CWD Project Planning & Execution 3 — Questions and Answers
Question 1: A driller is asked to drill a municipal supply well. Compared to a residential well, what additional planning consideration is MOST important?
- Using a smaller diameter casing
- Conducting a detailed hydrogeological study and yield testing per municipal standards (Correct answer)
- Reducing the drilling depth to save costs
- Skipping the grouting step to speed up the project
Correct answer: Conducting a detailed hydrogeological study and yield testing per municipal standards
Municipal wells require comprehensive hydrogeological studies and rigorous yield testing to ensure adequate and safe public water supply.
Question 2: What does a drilling mud program specify during project planning?
- The color codes for the drill crew's safety vests
- The type, weight, and viscosity of drilling fluid to use in each formation (Correct answer)
- The daily lunch schedule for the drill crew
- The brand of drill bits to purchase
Correct answer: The type, weight, and viscosity of drilling fluid to use in each formation
A drilling mud program specifies fluid properties to maintain borehole stability and control formation pressures during drilling.
Question 3: Which factor is MOST likely to cause a project schedule overrun during well drilling?
- Arriving at the site 30 minutes late on the first day
- Encountering unexpected hard rock formations that require bit changes and slower penetration rates (Correct answer)
- Using a slightly older model drilling rig
- Having extra crew members on site
Correct answer: Encountering unexpected hard rock formations that require bit changes and slower penetration rates
Unexpected hard rock or difficult geology is the most common cause of drilling schedule delays and cost overruns.
Question 4: When planning casing depth for a new well, which geologic condition would require setting the casing deeper?
- Presence of competent bedrock near the surface
- Shallow zones of contaminated groundwater or unstable unconsolidated sediments (Correct answer)
- Dry, stable sandy soils in the upper 10 feet
- Clay confining layers at great depth
Correct answer: Shallow zones of contaminated groundwater or unstable unconsolidated sediments
Contaminated or unstable shallow zones require the casing to be extended through them to protect the well and the water supply.
Question 5: During project execution, a driller encounters a zone of artesian pressure causing water to flow uncontrolled from the borehole. What is the correct immediate action?
- Continue drilling to the target depth as planned
- Install and seal the surface casing to control the flow before proceeding (Correct answer)
- Abandon the borehole and move to a new location
- Reduce the drilling fluid weight to stop the flow
Correct answer: Install and seal the surface casing to control the flow before proceeding
Artesian flow must be controlled by installing and sealing casing before drilling continues to prevent resource waste and potential hazards.
Question 6: Which document is typically required BEFORE a driller can legally pull a permit for a new water well in most US states?
- A signed contract from the pump installer
- Proof of the driller's state license or certification (Correct answer)
- A manufacturer's warranty for the drill rig
- A soil boring log from a previous unrelated project
Correct answer: Proof of the driller's state license or certification
Most states require drillers to hold a valid state license or certification before permits can be issued for well construction.
Question 7: What is the purpose of a pre-job safety meeting (tailgate meeting) before drilling begins?
- To review the client's payment history
- To discuss site-specific hazards, emergency procedures, and crew responsibilities (Correct answer)
- To negotiate the final project price
- To inspect the client's property for future business opportunities
Correct answer: To discuss site-specific hazards, emergency procedures, and crew responsibilities
Pre-job safety meetings ensure all crew members are aware of site-specific hazards and know their roles in emergency situations.
CWD Project Planning & Execution 3
A driller is asked to drill a municipal supply well.
Compared to a residential well, what additional planning consideration is MOST important?