SONDEUSE POUR FORAGE PAR ROTATION AVEC CIRCULATION INVERSE, COMPRENANT, A PROXIMITE DE LA BOUCHE DE FORAGE, UN DISPOSITIF D'EVACUATION DES DEBRIS DE FORAGE

摘要

In a drilling installation for the rotary drilling process with backwashing, a drill pipe column (6) is connected in the upper part via a guide tube (4, 24) to a spinner (5) and a chute (29) for discharging the mud and is set in rotation by a rotor or flexible coupling. According to the invention, it is fitted with a device (7) for discharging the mud, which device comprises the guide tube (4, 24) and is erected immovably in the direct vicinity of the drill hole outlet. In the interior of the guide tube (4, 24), a telescopic connector (15) is installed which connects the pipe column (6) to the device (7) for discharging the mud from the drill hole to the chute (29), the device (7) and the connector (15) being designed such that they ensure the rotation and functioning of the guide tube (4, 24) during the drilling process. <IMAGE>