Lead the bit rotary steerable tool
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.
1. 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.
2. The method of claim 1 , further comprising rotating at least one of the drill string component and the drill bit.
3. The method of claim 1 , further comprising rotating the drill bit in a direction and rotating the indenting member in another direction opposite the direction that the drill bit rotates.
4. The method of claim 1 , further comprising pushing the indenting member against the formation.
5. The method of claim 1 , wherein orienting the indenting member in a desired trajectory further comprises at least one of orienting the indenting member in a desired azimuth and angling the distal end of the indenting member.
6. 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.
7. The method of claim 6 , further comprising rotating the drill bit in a direction and rotating the indenting member in another direction opposite the direction that the drill bit rotates.
8. The method of claim 6 , further comprising pushing the indenting member against the formation.
9. The method of claim 6 , wherein positioning the indenting member in a desired trajectory further comprises at least one of orienting the indenting member in a desired trajectory, orienting the indenting member in a desired azimuth, and angling the distal end of the indenting member.
10. 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.
11. The method of claim 10 , further comprising rotating the drill bit in a direction and rotating the indenting member in another direction opposite the direction that the drill bit rotates.
12. The method of claim 10 , further comprising pushing the indenting member against the formation.
13. The method of claim 10 , wherein positioning the indenting member in a desired trajectory further comprises at least one of orienting the indenting member in a desired trajectory, orienting the indenting member in a desired azimuth, and angling the distal end of the indenting member.
14. 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.
15. The method of claim 14 , further comprising rotating the drill bit in a direction and rotating the indenting member in another direction opposite the direction that the drill bit rotates.
16. The method of claim 14 , further comprising pushing the indenting member against the formation.
17. The method of claim 14 , wherein positioning the indenting member in a desired trajectory further comprises at least one of orienting the indenting member in a desired trajectory, orienting the indenting member in a desired azimuth, and angling the distal end of the indenting member.