Methods for selecting bits and drilling tool assemblies

1. A method for selecting a drill bit, the method comprising:

selecting a first drill bit design;

simulating the first drill bit design drilling an earth formation under selected conditions;

graphically displaying at least a portion of the simulating, wherein at least a portion of a first resultant graphical display comprises a display of a path of the first drill bit design;

analyzing results of the simulating the first drill bit design, wherein the analyzing comprises reviewing a steerability of the first drill bit design;

selecting a second drill bit design;

simulating the second drill bit design drilling an earth formation under selected conditions;

graphically displaying at least a portion of the simulating, wherein at least a portion of a second resultant graphical display comprises

a display of a path of the first bit design and a display of a path of the second drill bit design;

analyzing results of the simulating the second drill bit design, wherein the analyzing comprises reviewing a steerability of the second bit design;

selecting, based upon the analyzing the results of the simulating the first and second drill bit designs, a bit design from among the first and second drill bit designs; and

manufacturing the drill bit having the selected bit design.

2. The method of claim 1 , further comprising:

using the drill bit to drill a well.

3. The method of claim 1 , wherein reviewing a steerability comprises reviewing at least one of lateral vibration data, lateral force data, a walk rate, and a force imbalance for the selected drill bit design.

4. The method of claim 1 , wherein the graphically displaying comprises displaying at least one of lateral vibration, axial vibration, torsional vibration, force on a component, rate of penetration, torque, and weight on bit.

5. The method of claim 1 , wherein the selecting a bit design comprises:

selecting a drill bit that has an improved rate of penetration during a building section of a wellbore.

6. The method of claim 1 , wherein at least one of the first resultant graphical display and second resultant graphical display is three dimensional.

7. The method of claim 1 , wherein at least one of the first resultant graphical display and second resultant graphical display is four dimensional.

8. The method of claim 1 , wherein the analyzing results of the simulating the second drill bit design comprises:

comparing a build angle of the first drill bit to a build angle of the second drill bit.

9. A method of selecting a drill bit, comprising:

simulating a first bit design;

assigning a first steerability factor to the first bit design, wherein the assigning comprises reviewing at least one of lateral vibration data, lateral force data, walk rate, and a force imbalance for the first bit design and assigning a relative value to the first bit design based on the simulating;

simulating a second bit design, wherein the simulating of the second bit design comprises graphically displaying a path of the first bit design and the second bit design;

assigning a second steerability factor to the second bit design;

selecting a bit design based on the first and second steerability factors; and

manufacturing the drill bit having the selected bit design.

10. The method of claim 9 , further comprising graphically displaying at least one of lateral vibration, axial vibration, torsional vibration, force on a component, rate of penetration, torque, weight on bit, and path of the drill bit.

11. The method of claim 9 , wherein at least one of the first steerability factor and second steerability factor is defined in terms of qualitative and quantitative data.

12. A method for predicting steerability of a bit design, comprising:

performing a drilling simulation of a drilling tool assembly, including a first bit design and at least one section of drill pipe, to simulate a drilling operation under selected conditions, wherein the simulation comprises graphically displaying a path of the first bit design;

outputting data representative of a steerability of the first bit design;

adjusting the first bit design to create an adjusted bit design;

performing a drilling simulation of the drilling tool assembly with the adjusted bit design, wherein the simulation comprises graphically displaying the path of the first bit design and a path of the adjusted bit design;

selecting a bit design having greater steerability, from among the first bit design and the adjusted bit design; and

manufacturing the drill bit having the selected bit design.

13. The method of claim 12 , further comprising:

adjusting a location of at least one component in the drilling tool assembly to create an adjusted drilling tool assembly;

performing a drilling simulation of the adjusted drilling tool assembly; and

outputting data representative of the steerability of the bit design selected when selecting the bit design having greater steerability.

14. The method of claim 12 , further comprising:

changing at least one of RPM and WOB for the drilling simulation; and

performing a new drilling simulation.

15. The method of claim 12 , further comprising:

adjusting a component on a drill string, the drill string comprising the at least one section of drill pipe and the drill bit.

16. The method of claim 12 , further comprising:

at least one of moving a location of a component on a drill string relative to other components, adding a component on the drill string, adding drill pipe, and removing drill pipe; and

performing a second simulation; and

outputting data representative of the steerability of the drill bit.

17. The method of claim 16 , wherein the data representative of the steerability of the drill bit is displayed graphically.