The pilot process can take several days, depending on the condition of the soil and may require changing of the drill stem or drill head. The drill fluid is then recycled and re-injected into the drill stem. The drill fluid lubricates the drill stem and carries out the cutting to the surface. The end of the Drill Pipe is to core the pilot hole. Drilling fluid is pumped through the drill pipe to the drill head at which time it is jetted through or pumped through a drill motor. The typical pilot hole on most large rigs is 9 7/8 but can vary depending on the soil conditions and rig size. Depending on the condition of the soil the pilot is drilled along a pre-determined alignment in which the path is selected by traditional methods. The Pilot hole is achieved either by excavation by jetting or by a down hole motor. The pilot hole is the beginning of the Directional Drill crossing. In some cases, Directional Drilling can cost a lot less then most other construction methods and procedures. By Directional Drilling you are able to be a great deal of depth below the obstacle, providing minimal maintenance cost and up keeping maximum protection. The reason being that Directional Drilling can be installed without any disturbance to natural habitats.ĭirectional Drilling has the least environmental impact of any method of construction. Horizontal Directional Drilling Since 1971, after Martin Cherrington successfully drilled the first directional river crossing, the industry has been moving forward.ĭirectional Drilling has seemed to be the most preferred method for pipeline construction as of late.
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