HYDRAULIC ANCHOR FOR FIXING TUBINGS IN WELLS WITH ROD PUMPS (VARIANTS) Russian patent published in 2021 - IPC E21B23/02 

FIELD: oil-producing industry.

SUBSTANCE: invention relates to the oil-producing industry, in particular to devices for fixing a tubing (TS) string in a casing string (CS) during oil extraction by well rod pumping units. The hydraulic anchor for fixing tubings in wells with rod pumps comprises a body with a longitudinal through channel and a hydraulic chamber communicating to it with fixing elements which are actuated by a pressure differential. The fixing elements are designed in the form of an elastic element of an inflatable packer or radial piston flaps which are spring-loaded with a return spring. The hydraulic chamber is connected to the cavity of the TS by a pipe via a channel in the upper part of the body and is insulated from the longitudinal through channel of the body.

EFFECT: technical result consists in increased reliability of the anchor extraction and simplified work for mounting said anchor and tensioning the TS string.

4 cl, 4 dwg