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IWCF Coiled Tubing Well Intervention Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf
- What is the primary purpose of coiled tubing in well intervention
- Drilling new wells
- Performing well maintenance and intervention without removing
- Transporting oil from well to refinery
- Cementing casing
operations?
the tubing
Rationale: Coiled tubing allows well intervention and maintenance
tasks to be carried out without pulling the tubing, which reduces downtime and costs. 1 / 4
- Which type of coiled tubing is most commonly used in intervention
- Carbon steel
- Low-alloy steel
- Stainless steel
- Aluminum
operations?
Rationale: Low-alloy steel coiled tubing provides a balance of
strength, flexibility, and resistance to fatigue, suitable for intervention operations.
- What is the main function of a BOP (Blowout Preventer) in coiled
- Pump fluid into the formation
- Measure downhole pressure
- Prevent uncontrolled flow from the well
- Cool the coiled tubing
tubing operations?
Rationale: The BOP is a critical safety device designed to contain well
pressure and prevent blowouts during intervention operations.
- Which of the following is a common risk during coiled tubing
- Excessive torque
- Gas hydrate formation
- Stuck coiled tubing
- Low mud weight 2 / 4
operations?
Rationale: Stuck coiled tubing is a frequent operational risk due to
differential sticking, mechanical failure, or wellbore obstructions.
- What is the significance of the neutral buoyancy point in coiled tubing
- Maximum pull capacity
- The depth at which tubing weight is balanced by buoyant force of
- Point of maximum tension
- Minimum torque location
operations?
fluid
Rationale: The neutral buoyancy point reduces the effective weight
of the coiled tubing in the wellbore, minimizing stress and risk of buckling.
- Which fluid property has the greatest effect on coiled tubing
- Color
- Density (mud weight)
- Viscosity only
- pH
performance?
Rationale: Fluid density affects hydrostatic pressure, tubing stress,
and potential for well control issues.
- What is the correct procedure if coiled tubing becomes stuck in the
- Pull harder 3 / 4
well?
- Reverse circulation
- Apply tension, circulation, and follow stuck-pulling procedures
- Abandon the tubing immediately
Rationale: Controlled procedures are required to free stuck tubing
without causing damage or well control issues.
- Which of the following is NOT a typical coiled tubing intervention?
- Well cleanout
- Perforating
- Horizontal drilling
- Stimulation
Rationale: Coiled tubing is used mainly for interventions, not for
drilling horizontal wells.
- What is the purpose of the injector head in coiled tubing operations?
- Measure downhole temperature
- Pump mud
- Feed and retrieve coiled tubing while controlling tension
- Close the well
Rationale: The injector head controls coiled tubing movement,
provides traction, and ensures safe deployment and retrieval.
- Which of the following can cause coiled tubing fatigue?
- Single continuous deployment
- Low wellbore pressure
- Repeated bending over sheaves and reels
- / 4
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