Method and device for large-diameter drilling or for digging wells along several inclinations

摘要

The present invention relates to a method of producing a borehole, in particular a large-diameter borehole, along a drilling axis in a field, comprising the steps of: i) carrying out an exploration borehole on the ground. along the drilling axis, the exploration drilling carried out having an internal wall, ii) digging of an interstice in the ground, the interstice being of substantially cylindrical shape centered on the drilling axis, iii) insertion of 'a side wall of a cutting basket in the gap, the wall surrounding blades of the cutting basket, the blades fitting inside the exploration borehole, iv) actuation of the blades to detach a portion of land confined within the side wall, said portion extending to the blades from a head wall of the basket, v) evacuation of the cutting basket and extraction of the portion of land, so as to dig the borehole. Figure for the abstract: Figure 2c