CASING PIPE CENTRALIZER Russian patent published in 2018 - IPC E21B17/10 

FIELD: mining.

SUBSTANCE: casing pipe centralizer includes centering metal plates fixed evenly along the perimeter on rings, retaining rings, fixed on the casing pipe, and cavities filled with water-swellable polymer. Retaining rings are installed at the top and bottom of the centralizer. Cavities for water-swellable polymer are made in the form of circular internal samples in retaining rings, directed towards the centralizer rings inserted into the retaining ring recesses with an ability of longitudinal displacement under the influence the expanding water-swellable polymer.

EFFECT: unimpeded release of the casing pipe into the well and its centering during casing pipe cementing.

2 dwg