Coiled Tubing Calculator
Calculate burst pressure, collapse pressure, tubing weight (air and fluid), buoyed weight, and fluid volume for coiled tubing operations.
CT Properties
Burst (Barlow) = 2 * Sy * t / OD
Collapse = 2 * Sy * (t/OD) / (1 + t/OD)
Wall thickness t = (OD - ID) / 2
Results
Burst Pressure (Barlow)
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Collapse Pressure
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Wall Thickness
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Weight in Air
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Buoyed Weight in Fluid
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Fluid Volume Inside CT
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Detailed Summary
How this was calculated
Burst pressure (Barlow): P_burst = 2 * Sy * t / OD. This is the internal pressure at which the tube wall reaches yield stress.
Collapse pressure: P_collapse = 2 * Sy * (t/OD) / (1 + t/OD). Conservative estimate for thin-wall CT.
Weight in air: Steel area = pi/4 * (OD^2 - ID^2). Weight/ft = area * steel_density / 144.
Buoyed weight: BF = 1 - (fluid_density_lb_ft3 / steel_density). Fluid ppg * 7.48 = lb/ft3.
Fluid volume: V = pi/4 * ID^2 * Length / 144. Convert ft3 to bbl (1 bbl = 5.615 ft3).
Need help with coiled tubing design, wellbore intervention planning, or fatigue life analysis?
Book a free strategy call →Understanding Coiled Tubing Calculations
Coiled tubing (CT) is a continuous length of steel tubing wound on a reel, used for well intervention, drilling, cleanout, and stimulation operations. Accurate calculation of burst pressure, collapse pressure, and string weight is critical for safe and efficient CT operations.
The Barlow formula gives the maximum internal pressure before the tube wall reaches yield stress. For CT, this is important during stimulation and acidizing jobs. A safety factor of 80% is commonly applied.
Knowing the buoyed string weight determines if the CT can reach target depth under its own weight, or if sinker bars are needed. The fluid volume determines pump displacement requirements and chemical volumes.
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