Horizontal Directional Drilling
Horizontal Directional Drilling is a method of installing utility pipelines and conduits under a wide variety of surface obstacles. First developed in the 1970s, this technique combines those used in conventional road boring with those found in oil and gas directional drilling. This method is now very popular for oil, water, natural gas and waste water pipelines as well as conduits for power and fiber optic cables. The main benefit is the ability to install these services without using traditional trenching methods, avoiding unnecessary environmental impact and providing additional security.
Benefits
A single location area can be used to install different pipes.
Less invasive, protects the ecosystem and adjacent areas.
More secure than traditional open cut.
Weather will not impact directly on the process.
Limited disruption, ideal for sites such as roadways, railways, recreational facilities, waterways and areas of high population density.
Ability to drill beneath surface obstructions or ongoing site operations.

For most HDD applications, the drilling tools and rig equipment are individually designed for each job. Pipe selection is a critical part of this process. Superior Drillpipe manufactures a wide range of pipe suitable for most HDD projects. By offering 3 1/2" OD to 7 5/8" OD with connection configurations matching the design requirements, Superior Drillpipe is one of the largest suppliers to this specialized industry. Tungsten carbide hard-banding and non-standard lengths are available on request.
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Process

• SITE INVESTIGATION AND DESIGN – Includes the site survey, locations of existing pipelines and services, and a geological investigation. Placement and equipment are then determined.

• PILOT HOLE DRILLING – A Pilot hole is drilled from the entry point to the exit point along the pre-determined profile and direction.

• HOLE ENLARGEMENT – In most cases pilot hole enlarging, also known as "pre-reaming," will be necessary. This is required to provide a bore diameter large enough for the pipeline to be installed in the drilled crossing.

• PULLBACK – The pipeline is pre-assembled and placed on rollers. A reamer is then connected to the drill pipe to enlarge the bore. The drill pipe is pulled back to the entry point until the pipeline is completely installed.

Horizontal Directional Drilling
HDD Data
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