CASING STRING CENTRALISER WITH VARIED GEOMETRY Russian patent published in 2013 - IPC E21B17/10 

FIELD: mining.

SUBSTANCE: in a casing string centraliser with varied geometry, comprising a vessel and centralising elements from elastic material rigidly fixed on the vessel, having an inner cavity, arranged along a spiral on the vessel surface. The inner cavity of the centralising elements is filled with a water-swellable polymer, and external side faces of the elastic centralising element are arranged as semi-permeable.

EFFECT: development of a centraliser with varied geometry for a casing string, having minimum diametre for lowering of a string into a well and maximum after its lowering and when cementing an inclined or a horizontal shaft.

11 dwg