FIELD: well drilling. SUBSTANCE: drill head is assembled of a set of blades different in functional application. The first function is coarse annular well drilling out of the well bottom. The second function is well wall calibration, core roll calibration and cutting the core so as to apply minimum axial load, keep diameter of the well and core. As this takes place, tubular cutters with holes open to drill string-borehole annulus. EFFECT: higher efficiency. 6 cl, 4 dwg
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Authors
Dates
1997-04-20—Published
1992-12-11—Filed