Stage 1 – is the drilling of a pilot bore with a drill rod with a cutter attached to it. The main circumstance for the successful implementation of crossing by directional drilling is the constant monitoring and, if necessary, adjustment of the pipeline’s route under the ground.Īll the process of directional drilling may be divided on to tree main phases: Then at last the pipe bundle is put into the prepared borehole. Then, special equipment (reamers) gradually enlarge the borehole up to the diameter of the pipeline and the walls are strengthened. According to the project documentation, the pilot drilling along a pre-defined pipeline route must be carried out. The point of directional drilling technology is the use of specialised drilling equipment, which consist of a drilling rig, reamers and other utilities, located at the point where the pipeline must enters in the ground. The method not only helps to save on additional costs, also it is environmentally friendly for coastal and aquatic resources, protects automobile and railways from the damaging effects of construction processes. The using of directional drilling eliminates the need for expensive underwater operations involving divers and other specialists, as well as shore protection works. ![]() ![]() As a trenchless pipelaying method, directional drilling has a number of advantages over other technologies. The work of directional drilling equipment has a high level of complexity and requires detailed engineering preparation of the construction site. Directional drilling (DD or HDD meaning horizontal directional drilling) for preparing boreholes for pipe-laying is one of the most advanced technologies for trenchless construction of the pipeline crossing and repairing them.ĭirectional drilling technology is successfully used in the construction of closed crossings of main pipelines through water, roads, mountains and other types of natural and artificial obstacles.
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