Horizontal Directional Drilling may be a method for trenchless installed in the underground pipelines, and cables. This includes employing a directional drill and electronic equipment to drill exactly along the chosen drill path and back the desired pipe.

 Why Use Horizontal Directional Drilling?

Underground pipelines will be constructed within the supply corridors in rural areas. Typically, units clear approved routes, dig specially prepared trenches, lower the welded section of the pipeline to trenches, and punctiliously removed soil for a recovery process.

This method is usually recommended for open space installations and may be performed in sensitive areas with a technique that minimizes the impact on the environment. During the Horizontal Directional Drilling activity, the land around the entrance and exit of the drill is disturbed but returns to the state before drilling.

Benefits Of Horizontal Directional Drilling:

  • This can be a fast and accurate drilling process that enables operators to realize excellent accuracy even at complex intersections.
  • Continuous monitoring and control during operation allows operators to maneuver between existing utility lines in tight spaces. They can use such drilling machines in a restricted area.
  • To altogether bypass the prevailing supply route, the borehole may be drilled at a deeper depth. Only the beginning shaft at the doorway point and, therefore, the receiving shaft at the exit point are required.

The Horizontal Directional Drilling Process Consists Of 4 Stages

Horizontal drill Diagonal drilling of pilot holes 

  • Stage 1-Excavation of pilot holes
  • Stage 2-Pre-drilling of horizontal holes
  • Stage 3-Pull-in operation
  • Stage 4-Installation of lines

Stage 1-Prepared Holes Within the Horizontal Drilling Process 

Drilling the primary step in an exceedingly successful horizontal drilling process is drilling a pilot hole. Pilot holes are drilled horizontally and continue below and above obstacles along a predetermined construction path. The electronic transmitter is housed during housing just behind the directional drill head. Directional drills can use the knowledge sent to orient the drill path in any direction.

Stage 2-Horizontal Drilling Process 2-Horizontal Drilling Pre-Drilling Directional Drilling Pre-Drilling Directional Drilling Pre-Drilling

Once the pilot hole is complete, the bore should be widened to the acceptable diameter for the merchandise. This can be achieved by “pre-drilling” the horizontal holes to an oversized diameter continuously within the second stage of the horizontal drilling process. Mud is pumped into directionally drilled boreholes to take care of the holes integrity and wash away shavings.

Stage 3 Of The Horizontal Drilling Process Is A Pullback

Once the directional borehole is enlarged, the pipe may be pulled out. The pipeline is prefabricated at the top of the wall opposite the oil rig. The reamer is attached to the drill string and connected to the merchandise via a pull head and swivel joint.

The swivel joint allows you to rotate the reamer without rotating the merchandise. The tilted drill rig begins the retreat process, rotating and pulling the drill string to circulate the drilling mud. The withdrawal continues until the reamer follows the drilling path through the directional drill, and therefore the pipeline is installed.

Stage 4-Installation of Lines in the Horizontal Drilling Process 

If a horizontally drilled line supports power lines, fiber optic cables, or other products, the aircraft cable is inserted into the pipe before being pulled into place.


Horizontal directional drilling could be a flexible, inexpensive, and environmentally friendly alternative to the typical drilling method. It is the best and accurate method for drilling. Once the pipe is installed, use a directional drill to put the merchandise on the pipe. For this, See the directional drilling techniques.