Device for controlling the direction of a drilled well, e.g. oil well, includes measuring the direction of the well and changing the orientation of the barrel to change the trajectory

摘要

The present invention is a device for controlling the direction of the trajectory of a wellbore, comprising a shaft (1) driven in rotation, a drill bit (11) secured to the shaft, a substantially cylindrical body (2) coaxial with the shaft and freely rotating in relation to the shaft pads (3) carried by the body that can move radially, and a pad displacement mechanism (96). The displacement mechanism individually comprises, for each pad, at least one thruster (7) whose longitudinal displacement in relation to the axis of the device causes an extension of the pad. Actuators (9) are driven by hydraulic energy supplied by drilling fluid circulating in the shaft and comprise a system (8) for selecting radical displacement of less than all of the pads.