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Akiet 7in HSCT Comparison Sheet and in 4000m Vertical Hole

Bob Harskamp
Bob Harskamp

This document compares the specifications of a 7-inch high strength composite tubular (HSCT) to a conventional 7-inch steel casing. It provides the mechanical properties, load ratings, and dimensions of the HSCT, noting that its burst and collapse ratings are significantly higher than the steel casing despite having a smaller diameter and wall thickness. The document also shows the reduced hook load of installing a 7-inch HSCT using enhanced composite casing installation compared to conventional steel casing in a 4,000 meter well, noting the buoyancy benefit from the HSCT's lower specific weight.

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High Strength Composite Tubular 7 comparison sheet & 7 in 4000m vertical hole May 2016
downhole composite pipes High Strength Composite Tubular HSCT Loads are designed as strong as specific application requirements: Composite Properties: o Young Modulus Hoop 21-25 GPa (depend on configuration) o Young Modulus Axial 18-21 GPa (depend on configuration) o Poisson Ratio is 0.30 The HSCT values are modelled at ambient temperature with Abaqus and FEM analysis and validated by 7 HSCT test results The HSCT values in the tables do not include any safety factor The required safety margins are determined for each project individually, dependent on each load case specific (e.g. running conditions, temperature range and life cycle requirements)
downhole composite pipes 7 Comparison Sheet HSCT loads are designed as strong as specific application requirements 7 inch systems 7 K55 35ppf VamTop Regular 7 HSCT 9.2ppf slender glued connection Pipe body OD 7.000 7.000 Pipe body ID 6.004 6.000 Connection OD 7.787 7.800 Connection ID 6.161 6.000 Drift diameter 5.879 5.875 Burst 472 bar 275 bar Collapse 501 bar 207 bar Tension 2486 kN 1255 kN Compression 1491 kN 400 kN Torsional (minimal) 14700 Nm 16700 Nm Note: values above are an example for a specific project. HSCT are Ultimate Values
downhole composite pipes Enhanced Composite Casing Installation (ECCI) Load for 4000m well with 7 casing: Conventional rig Super single rig Material Specific Weight Buoyancy in mud (1.10 sg) Hook load (tonne) Steel casing 35.0ppf 0.85 180 5 drill pipe 19.5 ppf 0.85 100 HSCC / ECCI 9.2 ppf 0.45 25 Mini rig

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Akiet 7in HSCT Comparison Sheet and in 4000m Vertical Hole

  • 1. High Strength Composite Tubular 7 comparison sheet & 7 in 4000m vertical hole May 2016
  • 2. downhole composite pipes High Strength Composite Tubular HSCT Loads are designed as strong as specific application requirements: Composite Properties: o Young Modulus Hoop 21-25 GPa (depend on configuration) o Young Modulus Axial 18-21 GPa (depend on configuration) o Poisson Ratio is 0.30 The HSCT values are modelled at ambient temperature with Abaqus and FEM analysis and validated by 7 HSCT test results The HSCT values in the tables do not include any safety factor The required safety margins are determined for each project individually, dependent on each load case specific (e.g. running conditions, temperature range and life cycle requirements)
  • 3. downhole composite pipes 7 Comparison Sheet HSCT loads are designed as strong as specific application requirements 7 inch systems 7 K55 35ppf VamTop Regular 7 HSCT 9.2ppf slender glued connection Pipe body OD 7.000 7.000 Pipe body ID 6.004 6.000 Connection OD 7.787 7.800 Connection ID 6.161 6.000 Drift diameter 5.879 5.875 Burst 472 bar 275 bar Collapse 501 bar 207 bar Tension 2486 kN 1255 kN Compression 1491 kN 400 kN Torsional (minimal) 14700 Nm 16700 Nm Note: values above are an example for a specific project. HSCT are Ultimate Values
  • 4. downhole composite pipes Enhanced Composite Casing Installation (ECCI) Load for 4000m well with 7 casing: Conventional rig Super single rig Material Specific Weight Buoyancy in mud (1.10 sg) Hook load (tonne) Steel casing 35.0ppf 0.85 180 5 drill pipe 19.5 ppf 0.85 100 HSCC / ECCI 9.2 ppf 0.45 25 Mini rig