Coiled tubing (CT) is defined by its diameter ranging from 0.75 to 4 inches and reel lengths of 4,000 to 25,000 feet, evolving from its first fully functional unit in the 1960s. Key components include the reel, injector head, and control cabin, with applications ranging from sand washing and scale removal to drilling and wireline logging. Advantages include high efficiency and versatility, while disadvantages focus on fatigue life limits and pressure tensions.

1. Coiled Tubing
Structure & Applications

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Introduction
• What is Coiled Tubing?
• Definition
• CT diameter; 0.75 – 4”
• Raw material
• Reel length; 4,000 – 25,000’
• History of Coiled Tubing
• 1944….”PLUTO”
• 1960’s…. first fully functional CT unit
• 1970’s -1985…. CT developed, 8,500’ ,¾”

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Key Elements of a CT Unit
• Reel
• Injector Head
• Control Cabin
• Power Pack

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Coiled
Tubing
Tubing
Reel
Control
Cabin
Power
Pack
Injector
Head

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Well Control Equipment
• BOP topped with a stripper
• BOP rams
• Blind ram
• Shear ram
• Slip ram
• Pipe ram
• BOP types
• Single
• Double
• Quad

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Pressure port
Kill port
Blind rams
Shear rams
Slip rams
Pipe rams
Quad BOP – Components

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Technical Challenges
• three technical challenges had to be
overcome:
• CT string…
• injector head…
• stripper or packoff device….

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Field Applications of Coiled Tubing

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Common Applications
• Washing Sand and Fill
• Scale Removal
• Unloading with Nitrogen
• Stimulation and Chemical Treatments
• Remedial Cementing
• Fishing

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Less Common Applications
• Drilling
• Wireline Logging
• Completions

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1. Washing Sand and Fill
• Removal of sand particles
from the wellbore
• Proppant flowback or
fracture operation screenout
• Gravel-pack failures

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2. Scale Removal
• Efficiently remove
downhole scale deposits
• Cleanout gaslift
mandrels, nipple profiles
and perforations
• Effective on iron sulfide,
barium sulfate, calcium
carbonate, silicates,
calcium sulfate, sludges,
paraffins, and coke tar

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3. Unloading with Nitrogen
• A quick and cost-
effective method
• Displacement of
wellbore fluid

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4. Stimulation and Chemical
Treatments
• Precise placement of
treating fluids
• Reduce exposure of
completion tubulars to
treating chemicals and
pressures
• Live well treatments
• Smaller treating volumes

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5. Remedial Cementing
• Perforation squeeze and
plugbacks
• Zonal isolations or
abandonment
• Casing leak repairs
• Plugging for abandonment

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6. Fishing
• Effective in highly deviated and
horizontal wells
• Perform circulating, jarring and
pulling operations concurrently
• No need to kill well

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1. Drilling
• New and deepening wells
• Slimhole applications
• Over and under balanced conditions
• No drilling rig required
• Compact size
• Decreased drilling times
• Environmentally friendly

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2. Wireline Logging
• Service highly deviated and
horizontal wells
• Continuous circulation of
fluids or gases
• Safe logging on live wells
• Fast trip times with
uniform speeds
• Accurate tool placement

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3. Completions
• New primary completions
• Re-completion
• Reduce number of
connections
• Reduce installation time
• Eliminate need for rig
• Live well completions

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Advantages of CT
• Overall Process Efficiency
• Live Well Service
• Ability to Push / Pull in Deviated Hole
• Performance - Speed In and Out of Hole
• Cost may be significantly reduced
• Versatility
➢Broad Spectrum of Applications
➢Sizes, Grades, and Lengths
• Small footprint
• Readily mobilization

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Small Footprint

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Moving

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Disadvantages of CT
• Fatigue life limit (cycles)
• Pressure and tension

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Summary
• What is Coiled Tubing?
• History of Coiled Tubing
• Key Elements of Coiled Tubing Unit
• Well Control Equipment
• Field Application of Coiled Tubing
– Common application
– Less common application
• Advantages and Disadvantages

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