... The article is devoted to the study of the problems of changing the trajectory of the wellbore at the boundary of the change in the physical and mechanical properties of the drilled soils during the construction of the main pipelines by the method of directional drilling. The article discusses the interaction of the rock cutting tool with the extensionof the pilot well with the drillable soils and describes the mechanism of formation of the ledges in the borehole that change theeffective diameter ...

... mechanics and reaming techniques. Engineering challenges arising from the use of various cutting tools for reaming are also highlighted. Materials and methods Comparative method of correlation of geotechnical construction conditions as applicable to directional drilling. Results Thus, ineffective soil drilling, poor cleaning of the bottomhole and the drill string, i.e. settling of cuttings in the hole, and well caving in slow down the rate of penetration on certain drilling intervals. Eventually,...

... направленного бурения при строительстве подводных переходов и находить технические решения по их предотвращению. The paper presents engineering solutions utilized in directional drilling as well as the impact they have on construction of underwater passages. This is exemplified by an accident development scenario of passing through gravel and cobble soils. Following the model of stress-strain state of soils composing ...

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