Downhole power generation and directional drilling tool
A drilling tool with power generation includes an outer housing and a driveshaft located at least partially within the outer housing and configured to rotate with respect to the outer housing via bearings located between the driveshaft and the outer housing. The drilling tool also includes an electromagnetic power generation device. The electromagnetic power generation device includes a coil and a magnet located within the housing. One of the coil and the magnet is coupled to the housing and the other is coupled to the driveshaft. Relative movement of the driveshaft with respect to the coil generates electrical power.
1. A drilling tool, comprising:
a housing;
a driveshaft located at least partially within the housing and rotatable with respect to the housing;
an electromagnetic power generation device including a coil and a magnet located within the housing, wherein one of the coil and the magnet is coupled to the housing and the other is coupled to the driveshaft, and wherein relative movement of the magnet with respect to the coil generates electrical power,
a borehole engagement member extendable radially and outwardly from the housing via drilling fluid flowing through the driveshaft;
an actuation system that controls extension of the borehole engagement member; and
a solenoid valve operable to control flow of the drilling fluid to the borehole engagement member.
2. The drilling tool of claim 1 , wherein the actuation system is powered by the electromagnetic power generation device.
3. The drilling tool of claim 1 , wherein the actuation system comprises a hydraulic, pneumatic, mechanical, or electrical actuation system.
4. The drilling tool of claim 1 , wherein the electromagnetic power generation device comprises a permanent magnet synchronous generator.
5. The drilling tool of claim 1 , wherein the electromagnetic power generation device is configured to generate three-phase power.
6. The drilling tool of claim 1 , further comprising a power storage device in which power generated by the electromagnetic power generation device is stored.
7. The drilling tool of claim 1 , wherein the electromagnetic power generation device further comprises a plurality of coils and a plurality of magnets.
8. A drilling tool, comprising:
a housing;
a driveshaft located at least partially within the housing and rotatable with respect to the housing;
a borehole engagement member extendable radially and outwardly from the housing;
an actuation system that controls extension of the borehole engagement member, wherein the actuation system is an electromechanical or a hydraulic actuation system that utilizes drilling fluid flowing through the driveshaft to control extension of the borehole engagement member; and
an electromagnetic power generation device including a coil and a magnet located within the housing, wherein one of the coil and the magnet is coupled to the housing and the other is coupled to the driveshaft, and wherein relative movement of the magnet with respect to the coil generates electrical power.
9. The drilling tool of claim 8 , wherein the actuation system is powered by the electromagnetic power generation device.
10. The drilling tool of claim 8 , wherein the electromagnetic power generation device comprises:
a plurality of coils coupled to the housing and located between the housing and the driveshaft; and
a plurality of magnets coupled to the driveshaft and located between the housing and the driveshaft.
11. The drilling tool of claim 8 , wherein the electromagnetic power generation device generates AC voltage and converts the AC voltage into a DC voltage.
12. The drilling tool of claim 8 , wherein the electromagnetic power generation device comprises a permanent magnet synchronous generator.
13. A method of drilling a borehole, comprising:
rotating a driveshaft coupled to a drill bit, wherein the driveshaft is coupled to a rotor of an electromagnetic power generation device and rotatable relative to a stator of the electromagnetic power generation device, the electromagnetic power generation device including a coil and a magnet, wherein one of the coil and the magnet is coupled to the rotor and the other is coupled to the stator;
generating power via the power generation device by moving the magnet with respect to the coil; and
powering an actuation system with the generated power, wherein the actuation system is an electromechanical or a hydraulic actuation system that utilizes drilling fluid flowing through the driveshaft to control radial extension of a borehole engagement member.
14. The method of claim 13 , further comprising radially extending the borehole engagement member to deviate the borehole.
15. The method of claim 13 , further comprising powering one or more sensing devices with the generated power.
16. The method of claim 13 , further comprising storing the generated power in a power storage device.