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US 8,522,897 B2Granted
Lead the bit rotary steerable tool
AssigneeSchlumberger Technology Corporation
InventorsDavid R. Hall, Paula Turner, David Lundgreen, Scott Woolston
Life of this patent
Estimating the term…
Abstract
A drilling assembly comprises a drill bit that includes a bit body intermediate a working face and a shank. An indenting member adapted to guide the drill bit protrudes from the working face. A flexible portion is disposed above the bit body.
Claims17
A method for steering a downhole tool string through a formation, comprising:
- positioning a drill bit adjacent a drill string component, the drill bit including:
- a working face;
- a shank;
- a bit body between the working face and the shank;
- an indenting member having a distal end protruding from the working face;
- a flexible portion disposed above the bit body between the shank and the adjacent drill string component, the flexible portion including an upper segment and a lower segment;
- and,
- at least one of an o-ring disposed between the upper segment and the bit body, a wiper seal disposed between the upper segment and the bit body, and a bellows-type seal disposed exterior to the flexible portion;
- positioning the drill string component and the drill bit in a bore hole;
- and,
- orienting the indenting member in a desired trajectory.
8 more elements
A method for steering a downhole tool string through a formation, comprising:
- positioning a drill bit in a bore hole, the drill bit including:
- a working face;
- a shank;
- a bit body between the working face and the shank;
- an indenting member having a distal end protruding from the working face;
- and,
- a flexible portion disposed above the bit body, the flexible portion including:
- a lower segment that includes an extension with a generally spherical geometry on a distal end;
- and,
- an upper segment that includes a generally spherical recess that corresponds with the generally spherical geometry of the lower segment;
- and,
- positioning the indenting member in a desired trajectory.
9 more elements
A method for steering a downhole tool string through a formation, comprising:
- positioning a fluid-driven turbine and a drill bit in a bore hole, the drill bit including:
- a working face;
- a shank;
- a bit body between the working face and the shank;
- an indenting member having a distal end protruding from the working face;
- and,
- a flexible portion disposed above the bit body, the flexible portion including:
- a lower segment;
- an upper segment;
- and
- an interface between the lower and upper segment, the interface including at least one of an o-ring and a wiper seal to create a seal;
- and,
- positioning the indenting member in a desired trajectory.
10 more elements
A method for steering a downhole tool string through a formation, comprising:
- positioning a drill bit in a bore hole, the drill bit including:
- a working face;
- a shank;
- a bit body between the working face and the shank;
- an indenting member having a distal end protruding from the working face;
- and,
- a flexible portion disposed above the bit body, the flexible portion including:
- a lower segment;
- an upper segment;
- and,
- an interface between the lower and the upper segment;
- and,
- a bellows-type cover disposed exterior to the flexible portion;
- and,
- positioning the indenting member in a desired trajectory.
12 more elements
Dependencies are inferred from the claim text.