HYDRAULIC ANCHOR Russian patent published in 2003 - IPC

FIELD: oil and gas industry, facilities fixing equipment in well. SUBSTANCE: hydraulic anchor has body with longitudinal through conduit and lateral windows. Dies with cylindrical compression return springs are installed in windows. Dies have holes for flow of liquid from through longitudinal conduit of body and for its getting into space between dies. Dies are placed in pairs in diametrical opposition and are fitted with brackets of L-shaped cross-section placed inside. Compression return springs are positioned between brackets. Brackets enter into dies placed in opposition. Liquid gets into spaces between dies. Dies extend from windows of body under pressure of liquid and cut into internal surface of operating string. Spring compresses. On completion of work spring returns dies to initial position. EFFECT: increased reliability of fixing of anchor and of its return to initial position. 1 dwg