What Is Directional Digging and How Does It Work?

A trenchless method for constructing underground cables, pipes, and service conduits is called horizontal directional drilling (HDD). It entails precisely drilling along the selected bore path and back reaming the necessary pipe using a directional drilling machine and related equipment.

Drilling a pilot hole with a small diameter is the first step. High-pressure jets and the drill bit will grind the soils ahead of the drill stem as drilling fluid is fed through the drill pipe to the drill bit. The drilling fluid will also transport the drilling waste back to the drill rig’s entrance pit.


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Directional drillers are following this process strictly because this involves pipes and more expenses might occur if not done correctly.

Depending on the size and complexity of the shot, there are various methods for tracking the pilot hole. A walkover guidance system is used for smaller pictures while a wireline magnetics type system is used for larger, more intricate shots. In all cases, the drill stem’s precise coordinates are communicated to the location engineer via a transmitter or steering tool that is placed close to the drill head. Continuous readings are taken to monitor the drill head’s depth, alignment, and % slope.

The operator and locator will make adjustments to keep the pilot hole on the planned bore path.

Know more about directional drillers by watching this video.
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