Abstract: The invention relates to a method and a device for propagating the detonation effect from one detonation cord (5) to another, whereby the detonation cords (5) comprise respective boosters (4) at their ends. The booster of one detonation cord and the booster of the other detonation cord to which the detonation effect should be propagated are arranged with their front faces joining each other. The aim of the invention is to provide a method and a device which allows propagation also under unfavorable conditions while requiring only few individual parts. For this purpose, at least one booster of two adjacent detonation cords is subjected to a force acting in the direction of the other booster, thereby ensuring constant contact of the front faces (15) of the adjacent boosters.

Abstract: A perforating gun having an outer gun barrel, inside of which an inner barrel is coaxially arranged, carrying perforators that can be ignited by means of a detonating cord leading through the gun barrel and, after ignition, pierce the gun barrel in order to form penetration holes, wherein means are provided for automatically closing the penetration holes after the blast, said means being a swellable medium. In order to ensure that the swellable medium requires little space in the perforating gun and can be easily integrated into the perforating gun, the swellable medium is disposed in a laminary manner inside the perforating gun.

Abstract: The invention relates to a method for completing a borehole (1, 2) prior to the start of production, wherein after making the borehole (1, 2) the borehole wall (3) is anchored in a sealed manner with a conveying tube (4) and/or casing tube, and the borehole wall (3) is perforated with perforation units (5) at desired points. To complete a borehole without the use of cemented conveying tubes and/or casing tubes, it is proposed that the conveying tube (3) and/or casing tube be provided on its outer surface with a swellable sealing jacket (6), wherein the sealing jacket (6) swells after activation and anchors the annular gap between the conveying tube (4) and/or casing tube and the borehole wall (3) in a sealed manner and simultaneously centres the conveying tube (4) and/or casing tube in the borehole (1, 2).

Abstract: The invention relates to a method and a device for propagating the detonation effect from one detonation cord (5) to another, whereby the detonation cords (5) comprise respective boosters (4) at their ends. The booster of one detonation cord and the booster of the other detonation cord to which the detonation effect should be propagated are arranged with their front faces joining each other. The aim of the invention is to provide a method and a device which allows propagation also under unfavorable conditions while requiring only few individual parts. For this purpose, at least one booster of two adjacent detonation cords is subjected to a force acting in the direction of the other booster, thereby ensuring constant contact of the front faces (15) of the adjacent boosters.