Apparatus and method for adjusting the azimut of the trajectory of a rotary drilling tool

摘要

The apparatus comprises a drill string having a first end by means of which the rotation is transmitted to the drill string and the axial force is transmitted to the tool (3) during the drilling and a second end to which the tool (3) is fixed. The apparatus comprises means of adjusting the azimuth of the trajectory of the drilling tool, constituted by a tubular body (10) comprising a radially protruding support blade (11) mounted in a rotary manner on the drill string (2) and a remotely manoeuvrable junction means allowing, in its active position, the drill string (2) and the tubular body (10) to be firmly connected together in rotation. In the inactive position of the junction means, the drill string (2) freely rotates inside the tubular body which is held stationary in the borehole by the support blade (11). The support blade (11) is placed in the borehole with an angular orientation allowing the adjustment of azimuth in the desired direction. …IMAGE…