HDD can be traced back to the early 1900s when it was discovered that the seemingly vertical wellbores were deviating at their own will with inclinations up to 50 degrees to the vertical.
#HORIZONTAL DIRECTIONAL DRILLING INSTALL#
With advanced HDD steering technology, it is also now possible to install pipelines under busy city streets without disrupting the flow of traffic and affecting businesses. Horizontal directional drilling is ideal for use where trenching needs to be avoided such as under a railroad, an embankment, highway, and beneath lakes and rivers. Traffic control and disruption are also reduced, as there is less above ground disruption, making horizontal directional drilling an ideal drilling solution for built up urban areas.Trenchlesspedia Explains Horizontal Directional Drilling (HDD).As the soil is kept underground and not surfaced, contamination is reduced. Reduced soil contamination as soil is pushed to the side rather than excavated in traditional drilling methods.This allows for new drilling locations that previously were inoperable or projects that were too expensive. Drilling flexibility as previous obstacles can now be manoeuvred around.Less disruption of the landscape as less soil is displaced in the horizontal drilling process.Post drilling, there is also less dirt to remove and rebury saving additional time. Faster installation of the conduit as the process doesn’t require a borehole to be dug vertically then horizontally like in traditional open cut drilling.Horizontal directional drilling has become the favoured drilling method for underground pipeline or cabling installation due to the significant cost savings that come with it. Once the reamer reaches the entry of the hole, the pipeline is now in place to lay the conduit.Īdvantages of Horizontal Directional Drilling The drill rod and reamer are attached to a swivel, reducing torsion stress transferred from the drill to the product pipe. The prefabricated pipeline is attached to a reamer at the exit point and pulled back through the directionally drilled borehole. Now that drill hole has been widened, the conduit is ready to be laid. Like in the first stage of the HDD process, a slurry is fed to assist in clearing cuttings while also keeping the borehole stable. The reamer is usually attached to the drill string on the exit side of the hole and pulled pack (pre-reaming). A reamer is operated to enlarge the diameter of the horizontal boring. The pilot hole has been drilled, however the drilling hole must be widened to allow room to lay the required cable or piping. The slurry created as a result of the horizontal directional drilling is fed back to the entrance site, ensuring the pilot hole is kept clear. Simultaneously, drilling fluid is pumped to the cutting head and combined with high pressure water to assist the cutting head in breaking down the soil ahead. Horizontal drilling continues along the design path and is expertly steered with the aid of a beacon behind the cutting head. Once the site has been safely setup, drilling of the pilot hole begins at the entry of the design path. Stage 1 – Horizontal drilling the pilot bore To discuss how we can help with your horizontal directional drilling project, contact us on 1300 926 112 or submit an inquiry now. Total Underground Solutions have more than two decades of experience in horizontal directional boring across Melbourne. Our horizontal directional drilling machine pre-reaming a borehole Choose the Horizontal Directional Drilling Experts Horizontal directional drilling is suitable for many different soil types and applications that go well beyond simple drilling under roads or boring under driveways. The pilot bore is tracked by the operator with a beacon and so can avoid common obstacles including roads, footpaths, railroads, driveways or rivers. This trenchless technology also allows for connections to be made that are not necessarily in a straight line. Often referred to as horizontal boring, horizontal directional drilling (HDD) is a surface to surface drilling method of laying cables or pipes underground whilst avoiding any obstacles that would usually prevent drilling to occur.
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