FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil and gas industry, in particular to devices for sealing the casing string and shutting off formations. The device for sealing the casing contains a patch in the form of a smooth metal pipe with elastic seals, a hydraulic setting tool with a hydraulic anchor and an expanding mandrel. An additional branch pipe is attached to the lower part of the patch, made with a smaller diameter and a length less than the working stroke of the landing tool. An additional self-adjusting punch with a gas tank is installed below the expanding mandrel. The landing tool is placed inside the patch and is equipped with sliding thrust plates. On the lower part of the patch there is a place for its stop when planting an additional branch pipe.
EFFECT: increased reliability, implementation of the possibility of accident-free installation of patches of any length at any depth of the well.
6 cl, 3 dwg
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