The standard procedure of a horizontal drilling can be divided into three main steps:

  • Pilot drilling
  • Reaming
  • Pullback


Step 1: Pilot Drilling

The pilot drilling is carried out along a two or three dimensionally bended target drill line between an entry point (in front of the drilling rig) and an exit point on the other side of the obstacle.



Step 2: Reaming

The second step in the realisation of a horizontal drilling consists in upsizing the borehole up to the diameter requiered for pulling in the pipe.


Step 3: Pullback

The last step of  a horiziontal directional drilling consists in pulling back the product pipe that has been prepared at the exit point of the drilling into the expanded borehole (pull back).





Drilling Contractors Association (DCA)
Charlottenburger Allee 39
D-52068 Aachen

Phone: +49 - 241 / 9019290
Fax: +49 - 241 / 9019299

Technical Guidlines

In order to ensure a high quality standard in the implementation of HDD projects, the DCA has issued a technical guideline, which is now available in its 4th edition in three languages, German, English and French.


DCA Sponsorship Award

The Drilling Contractors Association (DCA-Europe) aims to promote the new generation of academics in the field of Horizontal Directional Drilling.




in cooperation with 


 logo bohrmeisterschule 2017


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