Directional Drilling is a non invasive technique to install conduits underground that will eventually be utilised for phone, gas, Tv, electric or water .

Initially directional drilling developed by the oil industry in the United States, directional drilling these days is widely used for just about all pressure pipes below major obstacles such as freeways, huge rivers, airport runways for example. A steerable drill bit of 90mm diameter is launched through the surface at 10′ -15′ and provides a pilot hole. This is followed by a 125mm washover pipe. After completion, the pilot string is extracted and a rotating barrel reamer travels back along the washover pipe. Subsequent reaming continues until eventually the actual required diameter is actually completed. Drives of more than 1000 metres and upward to one metre in diameter have also been carried out.

Trenchless Pipe Laying is actually done with the help of a viscous fluid referred to as drilling fluid. It is a combination of water and, commonly, bentonite or polymer continually pumped to the cutting head or drill bit to facilitate the removal of cuttings, strengthen the bore hole, cool the cutting head, and lubricate the passage of the product pipe. Directional drilling will involve the installation of a pilot rod directly into virgin ground, that is steered from above ground using a tracking system. Typically the head of the pilot rod is eccentrically loaded, so that rotational steering will be able to take place.