FIELD: drilling soil or rock.
SUBSTANCE: group of inventions relates to controlled directional drilling. Apparatus for controlling the direction of drilling a borehole comprises an outer shell having an uneven rigidity, and an inner casing located at least partially inside the outer casing, rotationally independent of it and having uneven rigidity, and a drive shaft located at least partially inside the inner casing.
EFFECT: simplified control of the direction of the wellbore.
21 cl, 8 dwg
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