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1. (WO2018013633) A ROTARY STEERABLE DRILLING ASSEMBLY WITH A ROTATING STEERING DEVICE FOR DRILLING DEVIATED WELLBORES
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CLAIMS

1. A drilling assembly for use in drilling of a wellbore, comprising:

a steering unit having a tilt device and an actuation device, wherein a first section and a second section of the drilling assembly are coupled through the tilt device, and

wherein the actuation device causes a tilt of the tilt device to cause the first section to tilt relative to the second section along a selected direction while the steering device is rotating.

2. The drilling assembly of claim 1, wherein the actuation device applies forces on the tilt device to maintain the tilt device geostationary or substantially geostationary when the steering assembly is rotating.

3. The drilling assembly of claim 1 or 2, wherein the tilt device includes an adjuster and wherein the actuation device applies forces onto the adjuster to move the adjuster along a selected direction.

4. The drilling assembly of any of the claims 1-3, wherein movement of at least a part the actuation device is selectively adjustable to cause the first section to tilt with a selected tilt relative to the second section.

5. The drilling assembly of any of claims 1-4, wherein the tilt device includes a joint whose tilt is selectively adjustable to cause the first section to tilt with a selected tilt relative to the second section.

6. The apparatus of claim 1 or 2, wherein the tilt device is a hydraulic device and wherein the actuation device drives the hydraulic device to tilt the first section relative to the second section.

7. The apparatus of claim 6, wherein the actuation device selectively operates a valve of the hydraulic device to divert fluid flowing through the drilling assembly to tilt the first section relative to the second section.

8. The drilling assembly of claim 1 or 2, wherein the actuation device includes one or more spaced apart actuators, and wherein each such actuator applies force on a corresponding abutting element of the tilt device.

9. The drilling assembly of claim 8 further including a controller that controls the movement of at least one actuator of one or more actuators.

10. The drilling assembly of claim 9, wherein at least one of the abutting elements is selected from a group consisting of: a cam; a crank shaft; an eccentric member; a valve; a ramp element; and a lever.

11. The drilling assembly of claim 9, wherein the controller the tilt of the tilt device in response to a parameter of interest obtained from response of a sensor selected from a group consisting of: an accelerator; a gyroscope; a magnetometer, a formation evaluation sensor.

12. A method of drilling a wellbore, comprising:

conveying a drilling assembly in the wellbore, wherein the drilling assembly includes a disintegration device at an end thereof, a steering device that includes a tilt device and an actuation device, wherein a first section and a second section of the drilling assembly are coupled through the tilt device, and wherein the actuation device tilts the tilt device to cause the first section to tilt relative to the second section about the tilt device along a selected direction while the steering unit is rotating;

drilling the wellbore using the disintegration device; and

actuating the actuation device to tilt the tilt device to cause the first section to tilt relative to the upper section and to maintain the tilt geostationary while the drilling assembly is rotating to form a deviated section of the wellbore.

13. The method of claim 12, wherein the tilt device includes an adjuster and a joint and wherein the method further comprises applying forces on the adjuster to tilt the joint to cause the first section to tilt relative to the second section along the selected direction.

14. The method of claim 12 or 13, wherein the actuation device includes a plurality of spaced apart actuators, wherein each such actuator is configured to apply force on an abutting element of the tilt device.

15. The method of claim any of the claims 11-14, wherein the actuation device includes a plurality of actuators, wherein the method further comprises causing each such actuator to perform one stroke from a middle position thereof per revolution of the drilling assembly to drill the deviated section of the wellbore.