Oil well or pipeline sealing device for petroleum industry, has fibrous annular structure with fibers, having high mechanical resistance, helically wounding around inner membrane to reduce fiber density from ends towards central portion

摘要

The device has a sleeve (2) with inner and outer membranes (20, 21) inserted into each other so that the membrane (20) is exposed to inflation fluid pressure and membrane (21) is applied against a wall. A fibrous annular structure (5) has fibers exhibiting high mechanical resistance and connecting two end units. The fibers are helically wound around the membrane (20) so that fiber density is reduced from ends towards a central portion.