Directional Drilling

Directional Drilling

Underground Horizontal Directional Drilling

Directional Drilling is used to provide the efficient installation of service products under surface structures such as roads, railways, and runways - all without rerouting traffic.

Directional Drilling can be used to do installations under rivers, streams and canals.

Directional Drilling - The Process

Using the Navigator navigation equipment, obstacles are located and a path identified. A transmitter in the drill head provides depth, position and pitch information to an above-ground receiver (locater). The locating device displays this information to the user enabling him to make any changes necessary.

Specialised fluids are pumped through the drill rod and head to lubricate and seal the drill path. Drill fluids cool the transmitter and suspend the drill path cuttings, creating a liquid slurry.

The angled drill bit and flexible rod can be steered under, over and around underground obstacles. To change the direction of the pilot bore, the rod is pushed without rotation. When no direction change is needed, the rod is pushed and rotated simultaneously

After a rod is inserted into the ground another rod is connected to it at the machine to form the drill string. The drill strings bend in response to commands from the Navigator operator, allowing the drill head to move in any direction within the drill rods bending ability.

Directional Drilling - Installing Underground Utilities with the Navigator

After completing the pilot bore, the operator removes the drill head and attaches a backreamer which is pulled and rotated to enlarge the drill path. The product is then pulled into place behind the backreamer.

As with the pilot bore, fluid is introduced through the backreamer and mixed with the drill path cuttings, to create a liquid slurry which is displaced by the product being installed in the drill path. The backreamer is sized slightly larger than the product being installed, allowing the slurry in the drill path to flow freely around it. A swivel allows multiple styles and sizes of pipe or cable to be attached to the backreamer.

Directional Drilling Image Gallery

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