Well construction display

1. A method for steering a downhole tool in a wellbore, comprising:

measuring a tool face when a drill bit is off-bottom;

measuring an angular position of a drill string at the surface when the drill bit is off-bottom;

measuring a torque on the drill string when the drill bit is off-bottom;

measuring the tool face when the drill bit is on-bottom;

measuring the torque on the drill string when the drill bit is on-bottom;

determining a difference between the tool face when the drill bit is off-bottom and on-bottom;

determining a difference between the torque on the drill string when the drill bit is off-bottom and on-bottom;

determining a transfer function comprising the angular position of the drill string, the difference between the tool face, and the difference between the torque; and

varying the angular position of the drill string at the surface, based at least partially upon the transfer function, to reduce an angle between the tool face when the drill bit is on-bottom and a target tool face.

2. The method of claim 1 , further comprising measuring a weight on the drill bit when the drill bit is on-bottom.

3. The method of claim 2 , further comprising displaying:

the angular position of the drill string when the drill bit is off-bottom,

the tool face when the drill bit is on-bottom,

the weight on the drill bit when the drill bit is on-bottom,

the difference between the tool face when the drill bit is off-bottom and when the drill bit is on-bottom.

4. The method of claim 2 , further comprising displaying:

the tool face when the drill bit is off bottom, and

the difference between the torque on the drill string when the drill bit is off bottom and when the drill bit is on bottom.

5. The method of claim 2 , further comprising displaying:

the torque on the drill string when the drill bit is off bottom, and

the torque on the drill string when the drill bit is on bottom.

6. The method of claim 2 , wherein the transfer function further comprises the weight on the drill bit.

7. The method of claim 6 , wherein the weight on the drill bit remains constant as the angular position of the drill string is varied.

8. The method of claim 6 , further comprising varying the weight on the drill bit to reduce the angle between the tool face, when the drill bit is on-bottom, and the target tool face.

9. The method of claim 1 , wherein the torque on the drill string is measured at the surface.

10. The method of claim 1 , wherein the torque on the drill string is measured downhole.

11. The method of claim 1 , wherein the angular position of the drill string comprises an angular position of a drill string at the surface.

12. The method of claim 1 , wherein the angular position of the drill string is varied to steer the downhole tool.

13. A system for steering a downhole tool in a wellbore, comprising:

a first sensor coupled to the downhole tool;

a second sensor positioned at a surface location, wherein the first sensor, the second sensor, or both sensors are configured to measure:

a tool face when a drill bit of the downhole tool is off-bottom;

an angular position of a drill string at the surface when the drill bit is off-bottom;

a torque on the drill string when the drill bit is off-bottom;

the tool face when the drill bit is on-bottom; and

the torque on the drill string when the drill bit is on-bottom; and

a processor system configured to:

determine a transfer function comprising the angular position of the drill string, a difference between the tool face, and a difference between the torque; and

cause the angular position of the drill string at the surface to vary, based at least partially upon the transfer function, to reduce an angle between the tool face when the drill bit is on-bottom and a target tool face.

14. The system of claim 13 , wherein the first sensor, the second sensor, or both sensors are configured to measure a weight on the drill bit when the drill bit is on-bottom.

15. The system of claim 14 , wherein a computing system comprises a monitor configured to display:

the angular position of the drill string when the drill bit is off-bottom,

the tool face when the drill bit is on-bottom,

the weight on the drill bit when the drill bit is on-bottom, and

a the difference between the tool face when the drill bit is off-bottom and when the drill bit is on-bottom.

16. The system of claim 15 , wherein the monitor is configured to further display:

the tool face when the drill bit is off bottom, and

the difference between the torque on the drill string when the drill bit is off bottom and when the drill bit is on bottom.

17. The system of claim 16 , wherein the monitor is configured to further display:

the torque on the drill string when the drill bit is off bottom, and

the torque on the drill string when the drill bit is on bottom.

18. The system of claim 14 , wherein the transfer function further comprises the weight on the drill bit.

19. The system of claim 13 , wherein a weight on the drill bit remains constant as the angular position of the drill string is varied.

20. The system of claim 13 , wherein a computer system causes a weight on the drill bit to vary to reduce the angle between the tool face, when the drill bit is on-bottom, and the target tool face.

21. The system of claim 13 , wherein the first sensor measures the torque on the drill string.

22. The system of claim 13 , wherein the first sensor measures the tool face, and wherein the second sensor measures the angular position of the drill string.

23. The system of claim 13 , wherein the angular position of the drill string comprises an angular position of the drill string at the surface.

24. The system of claim 13 , wherein the angular position of the drill string is varied to steer the downhole tool.