The horizontal directional drilling technology represents a rotating hydrodynamic drilling system, controlled and based on three main technological principles:

  • Using a drilling hack in the shape of a borer with spear-like tool.
  • Advancing on the horizontal in a rotating system and by ground crumbling based on high pressure injections of special drilling fluid, based on bentonite clay (because of the thixotropic properties of this type of clay, the drilling mud also has the role of fixing the drilling hole and greasing agent).
  • Controlled operation from the surface of the poles and drilling device, by remote control, with the help of an electromagnetic wave transmitter placed inside the hack, that constantly sends parameters, as well as the depth the hack is at, the hack’s bend in % and orientation of the hack’s head in time table system.

Main technological stages:

  • Creating the pilot borehole by advancing the dirigible head in the ground
  • Successive enlargements depending on the diameter of the pipeline being installed
  • Installing the pipeline by pulling it through the created tunnel

The advantages of horizontal directional drilling:

  • The accuracy of the works by monitoring the whole process from the surface.
  • Work performed through horizontal directional drilling method does not cause discomfort to road or rail traffic and does not jeopardize safety.
  • Shorter execution time compared to other technologies.
  • Occupying a smaller land for equipment setup and work execution.
  • The reliability of undercrossing works through the horizontal directional drilling technology is the same as the lifetime of the buried pipelines.
  • Horizontal directional drilling can be performed in almost any type of ground.