DEVICE FOR REPAIR OF CASING STRING Russian patent published in 2000 - IPC

FIELD: oil and gas-producing industry; applicable in major repairs of producing and injection wells. SUBSTANCE: device has drive with rod, expandable branch pipe and expanding cones. They are hollow and their outer surface has cuts. Diameter of cuts are increasing from cone vertex. Ends of expandable branch pipe are easily deformable. Ends have sealing material on their outer side. Lower expandable cone is engageable with drive body via pressure bushing. Internal diameter of expandable cones and expandable branch pipe are similar. The device allows producing of lower ends in operating expandable branch pipes to reduce labor input and ensuring trouble-free operations with high quality of sealing of repaired section. EFFECT: higher efficiency. 2 cl, 2 dwg