Abstract: An apparatus, drilling arrangement and method for high voltage electro pulse drilling of rock. The apparatus includes a switch having two electrodes spaced at a distance from each other. The switch is located in connection with a drilling tool. The switch may be surrounded by a chamber, which prevents flushing fluid entering between a switch gap of the electrodes.

Abstract: A connector arrangement, drilling arrangement and method for high voltage electro pulse drilling of rock. The connector arrangement (Ca) comprises a high voltage joint (Cj) for connecting high voltage conductors (7, 7a, 7b) and being surrounded by a ground conductor (9). There are flushing channels (11) between the joint and the ground conductor for allowing passage of flushing fluid (F).

Abstract: An apparatus, drilling arrangement and method for high voltage electro pulse drilling of rock. The apparatus includes a switch having two electrodes spaced at a distance from each other. The switch is located in connection with a drilling tool. The switch may be surrounded by a chamber, which prevents flushing fluid entering between a switch gap of the electrodes.

Abstract: A drill bit assembly includes a drill bit body, an insulating layer disposed on an end of the drill bit body and that defines a drill bit face and two electrodes formed such that they both extend from the drill bit face. The two electrodes form a spiral on the drill bit face and are equidistant from each other at all locations of the drill bit face.

Abstract: A round-trip autoclave sample-extracting device for extracting a sample at a sample extraction location of a geological formation, the device includes a self-closing pressure chamber module for receiving the sample. The pressure chamber module is connected to a lifting module in order to lift the sample into the pressure chamber module in one sampling stroke. The round-trip autoclave sample-extracting device has a triggering module and a pressure regulating module, the triggering module acting on the lifting module in order to trigger the sampling stroke, and the pressure regulating module is coupled to the pressure chamber module at least on the pressure side after the sampling stroke in order to influence a pressure in the pressure chamber module. A round-trip method is proposed which includes a first trip and at least one second trip for extracting a sample while maintaining a pressure that is present at the sample extraction location.

Abstract: A drill bit assembly includes a drill bit body, an insulating layer disposed on an end of the drill bit body and that defines a drill bit face and two electrodes formed such that they both extend from the drill bit face. The two electrodes form a spiral on the drill bit face and are equidistant from each other at all locations of the drill bit face.

Abstract: A round-trip autoclave sample-extracting device for extracting a sample at a sample extraction location of a geological formation, the device includes a self-closing pressure chamber module for receiving the sample. The pressure chamber module is connected to a lifting module in order to lift the sample into the pressure chamber module in one sampling stroke. The round-trip autoclave sample-extracting device has a triggering module and a pressure regulating module, the triggering module acting on the lifting module in order to trigger the sampling stroke, and the pressure regulating module is coupled to the pressure chamber module at least on the pressure side after the sampling stroke in order to influence a pressure in the pressure chamber module. A round-trip method is proposed which includes a first trip and at least one second trip for extracting a sample while maintaining a pressure that is present at the sample extraction location.