Sealing device and method for sealing fractures or leaks in wall or formation surrounding tube-shaped channel

A method for sealing fractures or leaks in a wall or formation surrounding a tube-shaped channel, such as a drain, pipeline or well bore comprising:

• introducing an elongated body having a longitudinal direction is into the tube-shaped channel, whereby a sealing fluid placement section of the elongated body is arranged between a first and a second annular flow barrier extending from a circumference of the elongated body to the wall or formation surrounding the tube-shaped channel;
• and
• ejecting sealing fluid from the sealing fluid placement section through a sealing fluid outlet port into the tube-shaped channel, wherein a sealing fluid activation section is arranged between the second annular flow barrier and a third annular flow barrier extending from a circumference of the elongated body to the wall or formation surrounding the tube-shaped channel, by that the elongated body is displaced along the tube-shaped channel until the sealing fluid activation section of the elongated body is placed at a position where sealing fluid has been ejected by the sealing fluid placement section, and by that a sealing fluid activation device of the sealing fluid activation section is activated, whereby curing of the ejected sealing fluid is at least initiated or accelerated via irradiation of the sealing fluid.