CASING PIPE CENTRALISER Russian patent published in 2012 - IPC E21B17/10 

FIELD: mining.

SUBSTANCE: casing pipe centraliser comprises centralising metal plates fixed on rings and a stop ring for fixation of a centraliser on a casing string. On the inner surface of centralising plates there are hollow elements fixed, made of an elastic semipermeable material, the inner cavity of which is filled with a water-swellable polymer, at the same time the stop ring is arranged with rounded edges.

EFFECT: minimum diametre of a centraliser as a string is lowered into a well and maximum diametre after its lowering, and when cementing an inclined or horizontal borehole, efficient centralising of a casing string, reduced risk of centraliser damage in process of lowering.

2 dwg