FIELD: drilling equipment, particularly drill cores for rotary drilling large-size shallow wells in soft rocks with solid spots.
SUBSTANCE: drill core comprises shaft with borer having cutters arranged on borer end for advance well drilling. Conveyer belts forming cylindrical part of auger are installed around shaft. Shaft additionally includes conical part of auger having conveyer belt edges reinforced with cutters. Borer advances conical part of auger and forms advance cylindrical well.
EFFECT: increased efficiency of drilling in formation with solid spots.
2 dwg
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