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Novel Torque and Drag Model for Drilling Two-Dimensional High-Angle Wells.

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A new, simple model accurately predicts torque and drag (T&D) in high-angle wells, helping prevent drilling problems. This rig-friendly tool aids in managing friction forces and optimizing drilling operations.

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Area of Science:

  • Petroleum Engineering
  • Drilling Mechanics
  • Wellbore Modeling

Background:

  • High-angle well planning requires effective torque and drag (T&D) management to avoid drilling complications.
  • Existing T&D modeling is often complex and time-consuming for rig-site application.
  • Uncontrolled T&D can lead to drill string failures, stuck pipes, and stalled drilling progress.

Purpose of the Study:

  • To develop a novel, simple, and rig-friendly model for predicting T&D in high-angle wells.
  • To account for overlooked torque components, including top drive friction and drilling fluid viscosity.
  • To provide a practical tool for mitigating friction forces and improving drilling efficiency.

Main Methods:

  • Developed a soft-string concept model assuming the drill string acts as a chain on the wellbore's lower side.
  • Incorporated top drive system friction and drilling fluid torque using a reversed viscometer concept.
  • Validated the model using field data from the Western Desert, Egypt, with statistical analysis.

Main Results:

  • The model demonstrated practical reliability for two-dimensional wellbores, offering quick field application.
  • Achieved negligible error for drag prediction and an average of 10% error for torque prediction.
  • Quantified the impact of drilling parameters and survey station distance on T&D.

Conclusions:

  • The developed model effectively bridges the gap between theoretical T&D prediction and practical rig-site application.
  • Identified dominant factors influencing wellbore friction and their extent of impact.
  • Provided insights into best practices for T&D management derived from field data analysis.