HYDRAULIC DEVICE AND METHOD OF DETECTION AND SEALING OF HOLES OR CRACKS IN OIL WELL TUBING Russian patent published in 2020 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to sealing of holes, cracks or points of leaks through connections at the point of damage in underground tubing string. Device is assembled along 4 sections with total length within 2.00 m to 3.00 m and diameter ranging from 70 mm to 80 mm, and comprises upper section, which comprises one upper cylinder and upper means for movement, an extension section, which comprises upper piston, upper sealing means located in upper part of upper piston, one extension pipe, to upper part of which upper piston is attached by means of two mounting bolts, and lower part of which is connected to central section, and one lower adapter, connecting lower part of extension section with central section. Central section comprises central cylinder, lower means for displacement. Lower part of the central section is connected to the case of the lower piston. Lower section comprises lower piston housing, lower part of which contains two mounting bolts, one lower cylinder, one lower piston, lower sealing means, one sliding cone and attachment means, which contain one body and two wedges.

EFFECT: simplified sealing technology, increased safety, reduced time costs.

19 cl, 6 dwg