Tubing Well Control Certification Exam

IADC WellSharp Well Servicing – Coiled Tubing Well Control Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a coiled tubing well control system?

a) To circulate drilling mud

b) To maintain wellbore pressure within safe limits

c) To increase pump efficiency

d) To improve production rates

Rationale: Maintaining wellbore pressure ensures safe operations and

prevents kicks or blowouts.

• What is the function of the stripper in coiled tubing operations?

a) To support the injector head

b) To seal around the coiled tubing during movement

c) To prevent tubing collapse 1 / 4

d) To control flow rate

Rationale: The stripper provides a dynamic seal around the coiled tubing,

maintaining pressure control while the tubing moves.

3. The injector head is used in coiled tubing operations primarily to:

a) Pump fluid into the annulus

b) Monitor downhole pressure

c) Push or pull the coiled tubing in and out of the well

d) Rotate the coiled tubing

Rationale: The injector head provides the necessary mechanical force to

move the coiled tubing string.

• Which of the following is the most common well control method used in

coiled tubing operations?

a) Driller’s method

b) Wait and weight method

c) Volumetric method

d) Reverse circulation method

Rationale: The volumetric method is often used because coiled tubing units

lack a conventional rig pump and choke system.

• / 4

• What is the main function of the coiled tubing BOP stack?

a) To measure tubing diameter

b) To control well pressure and provide well shut-in capability

c) To support tubing weight

d) To lubricate moving parts

Rationale: The BOP stack ensures pressure control and allows safe shut-in

during a well control event.

• What is the most reliable indicator of a kick during coiled tubing

operations?

a) Increased pump rate

b) Unexpected increase in return flow rate

c) Drop in standpipe pressure

d) Tubing fatigue

Rationale: Increased returns indicate that formation fluids are entering the

wellbore.

• What is the primary function of the check valve in coiled tubing

operations?

a) To control injection rate

b) To release trapped gas

c) To prevent backflow from the well into the coiled tubing

d) To equalize pressure 3 / 4

Rationale: Check valves are designed to prevent reverse flow that could

lead to a kick up the tubing.

• What component provides the initial pressure barrier between the well

and the atmosphere in a coiled tubing stack?

a) Injector head

b) Annular BOP

c) Stripper

d) Tubing hanger

Rationale: The stripper seals around the tubing during movement, serving

as the primary pressure barrier.

• What should be done first if a kick is suspected during coiled tubing

operations?

a) Continue pumping

b) Pull out of hole

c) Stop movement and shut in the well

d) Increase nitrogen injection

Rationale: The first response is to stop operations and secure the well to

prevent escalation.

• / 4