US 2026/0160133 A1 · DRILL BIT STEERING SYSTEM

Abstract

A drilling system having a drill string and a bottom hole assembly (“BHA”) is used to drill a wellbore in a subterranean formation. The BHA includes a drill bit and a steering arm for steering the drill bit through the subterranean formation. The steering arm is part of a steering assembly that operates in response to a pressure difference in drilling mud flowing through the BHA. The pressure difference is selectively created by controlling the flow of drilling mud through a pair of channels in the BHA. The steering arm is coupled with a piston having opposing sides in communication with the channels. Regulating how much flow passes through each of the channels creates a pressure difference across the piston to generate a force. The force is used to pivot the steering arm outward against the wellbore wall to steer the drill bit.

Claims20

Dependent claims

A rotary steerable drilling system for drilling a wellbore into the earth's surface, the rotary steerable drilling system comprising:

a housing configured to be mechanically connected to a drill bit and a drill string;
a fluid passageway in the housing configured to guide a flow of a drilling fluid from the drill string to the drill bit;
a first and second chamber in the fluid passageway,
a valve disposed in the fluid passageway,
the valve configured to temporarily increase a fluid pressure in the first chamber relative to the fluid pressure in the second chamber,
a piston having opposing sides in fluid pressure communication with the first chamber and the second chamber, the piston radially moveable with respect to a longitudinal axis of the drill string in response to different fluid pressures in the first chamber and the second chamber, and
a rod configured to transfer motion through the housing to provide a steering force with a wall of the wellbore in response to radial movement of the piston.

4 more elements

Dependencies are inferred from the claim text.

Drill bit steering system

Life of this patent

Drill bit steering system

Life of this patent

Abstract

Claims20