FIELD: oil and gas industry.
SUBSTANCE: system includes lower, upper and intermediate plasters connected in series with each other by means of a conical thread in the form of thin-walled pipes of the same geometry having elastic sealing rings outside. The lower plaster is installed in contact with bridge packer or artificial well bottom. An expansion unit has a pair of mandrels rigidly fixed on a tubular rod connected with a hoist, the conical parts of which are directed with their tops towards each other. The upper and lower plasters each have a pre-expanded funnel-shaped section in which a similar mandrel is arranged. When the assembled system is lowered, the string of plasters abuts the bridge packer or the artificial well bottom. The expansion unit proceeds downwards, and its upper mandrel expanding the upper plaster provides anchoring of the system. At that the upper mandrel does not enter the area of threaded connection of the patches to prevent scuffings and axial deformations of the latter.
EFFECT: increased reliability and operation efficiency of elimination system for non-tightness of casing strings.
3 cl, 4 dwg
