Trenchless Training FR
Courses Horizontal directional drilling (HDD)

ST01G-FHD FREN

Horizontal Directional Drilling

Principle, equipment, the three drilling stages, the role of soils and bentonite, guidance and design.

Directional drill rig and drill rods on a job site

Module preview

4 of 46 slides, as they appear in the module.

  • Slide 1 Horizontal directional drilling

  • Slide 7 A directional drilling job site

  • Slide 15 The three stages, animated

  • Slide 21 Handling and connection on site

Horizontal directional drilling (HDD) is used to cross a watercourse, a road or a highway, and to install long lengths of pipe in a single pull. This module presents the principle, the equipment and the method, then focuses on what makes a bore succeed or fail: soil conditions, guidance and drilling fluids.

It draws on site photos and specifies what the designer must study and require from the contractor.

Objectives

By the end of the module, you will be able to:

  • Define horizontal directional drilling and recognize when it is the right choice
  • Describe the equipment and the criteria for selecting a directional drill rig
  • Explain the three stages: pilot hole, reaming, pullback
  • Identify the limits of the technique and the decisive role of soils
  • Distinguish between guidance systems
  • Explain the role of bentonite and the plans to require from the contractor

Outline

  1. Definition and field of application
  2. Equipment: the drill rig and selection criteria
  3. The three stages: pilot hole, reaming, pullback
  4. Limits and conditions for success: soil conditions
  5. Guidance systems
  6. Drilling fluids (bentonite) and the plans to require
  7. Engineering and design

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