| 摘要 |
FIELD: oil-and-gas industry.SUBSTANCE: impermeable shell is lowered on string or cable to leaky thread or through damage to make it tightly abut on pipe wall perimeter. Said shell is composed og coiled sheet metal. 2-3 mm-thick sheet metal is made from spring steel, e.g. 60C2 or 65"?" and riveted in the coil by two low-strength rivets. Rivets are cut at the burst of charge arranged inside said coil opposite leaky joint. Then, metal sheet is forced by inner elasticity to uncoil and to be pressed against casing pipe inner surface. Metal sheet outer surface is pre-coated with soft deformable material, for example, rubber, or gasket of the same material is fitted on coil outer side to be deformed by elasticity to seal the space between metal sheet and casing pipe inner wall.EFFECT: efficient and reliable sealing.1 cl, 2 dwg |
