FIELD: construction.
SUBSTANCE: invention relates to the construction of pipeline crossings through natural and artificial obstacles by directed drilling in loose soils. According to the method, the wellbore zone is treated with a drilling fluid at a dynamic shear stress of at least 300 dPa and a plasticity coefficient of at least 800 s-1. Ratio of the particle size of the drilling mud to the diameter of the permeable channel is at least 6.
EFFECT: increase in the strength of the borehole wall, necessary for dragging the pipeline in the zone of occurrence of unconsolidated soils.
1 cl, 3 tbl, 1 dwg
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