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Introduction to Directional Drilling

Introduction to Directional Drilling. Khalifah Al-Amri Senior Drilling & Workover Engineer. Outline . Definition What Are Directional Wells ? Directional Well Types Why Drill Directionally? Planning A Directional Well Path How To Drill Directionally? Horizontal Drilling Complex Wells.

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Introduction to Directional Drilling

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  1. Introduction to Directional Drilling Khalifah Al-Amri Senior Drilling & Workover Engineer

  2. Outline • Definition • What Are Directional Wells ? • Directional Well Types • Why Drill Directionally? • Planning A Directional Well Path • How To Drill Directionally? • Horizontal Drilling • Complex Wells

  3. Definition • Directional drilling is the science of deviating a well bore along a planned course to a subsurface target whose location is a given lateral distance and direction from the vertical.

  4. What Are Directional Wells ? • Directional wells are deviated from vertical (straight) • Directional wells are drilled with intentional control to hit a pre-determined target: • inclination (angle) • azimuth (direction). • Think 3-D when directional

  5. Slant (J) Type Vertical Type “S” Type Horizontal Type Directional Well Types

  6. Inaccessible Locations Salt Dome Drilling Fault Controlling Why Drill Directionally? Sidetracking

  7. Why Drill Directionally?

  8. Dir 0 N KOP Inc MD EOW TVD HD Planning A Directional Well Path • Kick Off Point • Build Up Rate • Azimuthal Direction • Inclination Angle • True Vertical Depth • Measured Depth • Horizontal Displacement

  9. Slide & Rotate Mode Downhole Motor Bent Sub Fixed Adjustable Surveying Tool Media of Transmission How To Drill Directionally?

  10. Horizontal Drilling • Types of Horizontal Wells: • Long Radius (2°-8°/100’) • Medium Radius (8°-30°/100’) • Short Radius (30°-60°/100’) • Ultra Short Radius (60°-200°/100’)

  11. Horizontal Drilling • Applications: • Gas and Water Coning: • Longer horizontal drain hole increases the exposure of the pay-zone • Allows a higher production rate at lower drawdown pressure resulting in less coning Horizontal Wells Gas Vertical Wells Oil Water Water Coning Gas Coning

  12. Horizontal Drilling Other Major Applications: • Maximum reservoir exposure • Naturally fractured tight reservoirs • Thin dry reservoirs • Less wells needed to develop a field

  13. Complex Wells • Stacked Laterals

  14. Complex Wells • Fishbone Wells

  15. Complex Wells • Stacked Fishbone Wells

  16. Complex Wells • Multiple-Branch Multilateral Wells

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