Abstract: The invention relates to a downhole device for rotary drilling, including a power generator installed at the end of a series of rods; a pulse generator which is mechanically and electrically connected to said electricity generator; an electric drilling tool; and an electrical sliding switch system. The invention is useful in the field of drilling by electrical discharge.

Abstract: A downhole device for rotary drilling is provided. The device includes a power generator installed at the end of a series of rods, a pulse generator which is mechanically and electrically connected to the electricity generator, an electric drilling tool, and an electrical sliding switch system.

Abstract: A high-power pulse generator (1), belonging to the LTD family, includes two series of power modules, one series of standard modules (3s) and one series of modified modules (3m), each including a switch (6s; 6m), provided with a trigger electrode (9s; 9m), positioned in series between two capacitors (4s; 4m), the modified modules being designed to produce a pulse at a frequency substantially three times the frequency of the standard modules, and a trigger device (13) designed to control the standard and modified switches (6s; 6m) via a single trigger signal applied to the trigger electrode (9s; 9m) of same. The trigger signal is applied to the switches through a trigger impedance (10m; 10s) that is different between the standard and modified modules, and the plateau slope of the generated pulse depends on the difference between the value of the standard impedance and that of the modified impedance.

Abstract: The invention relates to a downhole device for rotary drilling, including a power generator installed at the end of a series of rods; a pulse generator which is mechanically and electrically connected to said electricity generator; an electric drilling tool; and an electrical sliding switch system. The invention is useful in the field of drilling by electrical discharge.

Abstract: A device and a method for generating intense and brief variations of magnetic pressure, predetermined and controlled, capable of being isentropic inside a sample (23) of solid material. An electromagnetic cell (1) includes a flat parallel line of conductive material having two branches (4, 5) in the form of planar plates, of similar shapes and dimensions, separated from each other by a distance of not more than 3 mm, one of which (4) bears the sample (23) rigidly fixed on the branch (4), the two branches (4, 5) being electrically connected to each other by an end junction strip (7), and electrically connected, opposite the end junction strip, to elements (2, 3) generating electric current pulses so as to produce in less than 500 ns an electric current flowing in the electronic cell (1).