HYDRAULIC ANCHOR Russian patent published in 2009 - IPC E21B23/06 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, and namely to devices used for fixing the equipment, for example packers, borehole jacks, etc. in the wall. Hydraulic anchor consists of a casing with a longitudinal through channel and transverse windows interconnected therewith. In windows there are dies with return springs installed, which are made in the form of hollow pistons. End surfaces of the dies are cylindrical and smooth, and are equipped with diametric protrusions, at that transverse diameters of smooth surfaces of the dies are equal to pipe bore, and diameters of protrusions are larger than that diameter. Hydraulic anchor, owing to cylindrical planes on the edges of the dies with diametric protrusions located in the plane perpendicular to the pipe axis, when being installed in pipes made from ductile material, does not deform the main body of the pipe, improves its carrying capacity thus forming stiffeners, and improves anchor mounting reliability.

EFFECT: improving carrying capacity of pipe thus forming stiffeners, and improving anchor mounting reliability.

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