CASING CENTRALIZER Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: split coupling slots are made through; die drive is made in the form of a flat spring positioned concentrically with segmented rings and engaged with dies at the point of intersection of their inclined surfaces with their upper end faces perpendicular to centralizer axis. This allows the centralizer to move along pipe body by distance limited by casing couplings. EFFECT: design simplified and reliability increased for casing centralization on borehole caved sections. 3 dwg