Horizontal directional drilling
The technology of the horizontal directional drilling (HDD) allows VIS-MOS to build oil/gas pipelines, water lines and telecommunication systems through the natural and artificial obstacles such as rivers, lakes, roads, railway lines and dams – simply crossing under them.
There are three stages in the process of pipeline construction:
- 1 - Pilot hole drilling;
- 2 - a consecutive widening of borehole;
- 3 - pulling through of a pipeline.
The horizontal directional drilling (HDD) method is an alternative to the traditional trench method and it represents the technology in which serious resource-saving reserve is included. Its application is economically beneficial and these benefits are short-term and long-term that can be obviously proven by the comparative analysis of two methods of pipeline construction.
Comparison table:
| Trench method | Horizontal directional drilling method |
| Work content Finance Terms | |
| Large volume of excavation
Involving heavy machines and special water transport Great number of labor force | A single drilling complex
A single team of workers |
| Considerable financial expenses | Financial expenses reduction up to 30% |
| Long construction period | Reduction of construction period from 2 to 20 times |
| Additional expenses | |
| Costs for accidents elimination and their consequences | The risk of accident emergence is brought to naught |
| Operating costs for control and repairs | The guarantee of long-term preservation of pipelines
Lack of operating costs |
| Construction of a reserve run of pipeline | A chance to reject a reserve run of pipeline |
| Environment and Man | |
| The Nature suffers from non-recoverable damage | Ecology and landscape remain virginal |
| - Navigation dependence
Traffic conditions interruption | Navigation, road and railway traffic is not interrupted |
| Paving is damaged
Tempo of life is disturbed | Paving is not damaged
People are not disturbed |
| Long-term preparation and confirmation of conciliatory documents with the environmental organizations | Minimum coordination with environmental organizations |