Smart Drilling Gmbh

Dmt-Gesellschaft Fur Forschung Und Prufung Mbh

Welldone Engineering Gmbh

Werner Vorhoff

Dagobert Feld

Dieter Wrobel

A directional drilling device includes a housing, a drive shaft extending through the housing, a plurality of magnetic field sensors positioned in the housing and in signal communication with a control device also positioned in the housing, wherein the magnetic field sensors are configured to determine a magnetic interference declination influenced by a magnetic interference field as a magnetic interference flux density and to transmit a magnetic interference declination value corresponding to a magnetic interference flux density to the control device, and a directional control device coupled to the housing and controllable by the control device to control a position of the directional drilling device, wherein the control device is configured to generate a correction value based on the magnetic interference declination value, and wherein the correction value corresponds to a deviation of the magnetic interference flux density from a reference magnetic flux density measured at a reference standard.

Directional drilling device and method for calibrating same

A drilling tool includes a tubular housing, a bit drive shaft configured to rotate in the housing and support a rotary drill bit at a lower end of the bit drive shaft, and a plurality of bracing devices arranged in the housing. The drilling tool also includes a control device configured to actuate the bracing devices, wherein the bracing devices include anchoring elements and an actuator assembly to which the anchoring elements are coupled The anchoring elements are distributed over the circumference of the housing, wherein the anchoring elements are movable radially outwardly and inwardly and are configured to be retracted into grooves in the housing The radial movability of said anchoring elements is temperature-controlled by the actuator assembly which includes at least one heat-expandable pressure medium, and wherein the pressure medium includes at least one of a gas and a liquid.

Drilling tool for sinking automatically directionally monitored bores

The invention relates to a reliably functioning directional drilling device for continuous operation, with automatic, precision-controlled monitoring of targeted drilling at great depths with specification of a selectable directional path of the wellbore, comprising a housing, a bit drive shaft, which preferably rotates in the housing and which bears a rotary drill bit at its end, a control device located in the body section of the housing, and direction control devices for generating directing forces having radially alignable force components for the alignment of the directional drilling device during drilling operations, and magnetic field sensors that are connected to the control device, the magnetic field sensors being arranged in the head section, more specifically in the forward region of the housing facing the rotary drill bit, in close proximity to the rotary drill bit, i.e. near the rotary drill bit, and being calibrated by means of the method of the invention using a homogeneous magnetic field generated by a Helmholtz coil.

In a drill string pressure pulses are generated by expansion and constriction of an elastic body to transmit information along the drill string.

Growing community of inventors

Wesel, Germany

Werner Vorhoff