FIELD: well drilling. SUBSTANCE: drill bit has rock breaking members, and a casing with flush passage. Blade guide unit is placed in the passage. The drill is provided with a rod installed in the flush passage of the casing. Rod axis agree with passage axis. Blades of the guide unit are installed at an angle with respect to the plane perpendicular to casing lengthwise axis within 40 - 15 degrees. The angle comes smaller, as it goes from passage inlet to outlet. EFFECT: higher efficiency. 2 dwg
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