CPA Well Control & Blowout Prevention 1 — Questions and Answers
Question 1: What is a 'kick' in well control terminology?
- A sudden increase in rotary speed
- An unwanted influx of formation fluid into the wellbore (Correct answer)
- The force applied when setting casing
- A type of drilling bit impact
Correct answer: An unwanted influx of formation fluid into the wellbore
A kick occurs when formation pressure exceeds the hydrostatic pressure of the drilling fluid, causing formation fluids (gas, oil, or water) to flow into the wellbore.
Question 2: What does BOP stand for in petroleum drilling operations?
- Bottom Outlet Port
- Blowout Preventer (Correct answer)
- Barrel Output Pressure
- Bore Opening Plug
Correct answer: Blowout Preventer
BOP stands for Blowout Preventer, which is a large specialized valve installed at the wellhead to seal, control, and monitor oil and gas wells.
Question 3: Which of the following is the PRIMARY early warning indicator of a kick while drilling?
- Increase in standpipe pressure
- Pit volume increase (Correct answer)
- Decrease in rotary torque
- Drop in pump stroke rate
Correct answer: Pit volume increase
An increase in pit volume (the total volume of drilling fluid in the surface pits) is the most reliable primary indicator of a kick because it shows formation fluid has entered the wellbore.
Question 4: What is the function of a blind ram (or blank ram) in a BOP stack?
- To seal around drill pipe of any diameter
- To completely seal the wellbore when no pipe is in the hole (Correct answer)
- To shear through the drill string and seal the well
- To allow fluid circulation while the well is shut in
Correct answer: To completely seal the wellbore when no pipe is in the hole
Blind rams are designed to close and seal the wellbore when no pipe or tools are across the BOP, providing a complete pressure seal on an open hole.
Question 5: What is 'overbalanced' drilling?
- When the drill string is heavier than the formation can support
- When hydrostatic pressure of the mud exceeds formation pressure (Correct answer)
- When rotary speed exceeds the formation's drilling rate
- When WOB is greater than the bit's rated load
Correct answer: When hydrostatic pressure of the mud exceeds formation pressure
Overbalanced drilling means the hydrostatic pressure exerted by the drilling fluid column is greater than the formation pore pressure, which prevents formation fluids from entering the wellbore.
Question 6: What is the FIRST action a driller should take upon detecting a well kick?
- Increase mud weight immediately
- Pick up off bottom and shut in the well (Correct answer)
- Call the company man and wait for instructions
- Increase circulation rate to circulate the kick out
Correct answer: Pick up off bottom and shut in the well
The first response to a detected kick is to pick up off bottom (to avoid getting stuck) and shut in the well using the BOP to prevent further influx of formation fluids.
Question 7: What is the primary purpose of drilling mud (drilling fluid) in relation to well control?
- To lubricate the drill bit and cool it during cutting
- To provide hydrostatic pressure that controls formation pressures (Correct answer)
- To carry drill cuttings to surface for geological analysis
- To prevent corrosion of the drill string
Correct answer: To provide hydrostatic pressure that controls formation pressures
Drilling mud provides hydrostatic pressure equal to or greater than formation pressure, which is the primary mechanical barrier preventing formation fluids from entering the wellbore.
CPA Well Control & Blowout Prevention 1
What is a 'kick' in well control terminology?