DEVICE FOR PICKING DIRECTIONAL CENTER MARK FROM THE WELL Russian patent published in 2004 - IPC

FIELD: well-boring equipment. SUBSTANCE: device has core barrel, center mark extractor, directing means and marking cutter. Adapter is screwed into the upper end of core barrel. Boring means is screwed into the lower end of core barrel. Device also has a butyric pencil. Center mark extractor has hollow bosses on its body. Directing means has boss enclosures for storing electrolyte solution and metallic plates. Butyric pencil and marking cutter are fixed on the inner side of bosses. Supporting ring made from antifriction material is placed on center mark extractor. In operating condition boss enclosures are covered by protective covers made from antifriction material. EFFECT: increased reliability of measurement of inclination angle and well apsidal plane direction. 3 dwg