Dual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations

1. A method for forming a subsurface wellbore, comprising:

operating a drilling string in a first direction of rotation;

operating a first motor located near the end of the drilling string to rotate a bottom hole assembly in a direction of rotation opposite the direction of rotation of the drilling string; and

rotating a drill bit using a second motor that is coupled to the first motor.

2. The method of claim 1 , further comprising controlling a rotation of at least a portion of the bottom hole assembly coupled to the drilling string.

3. The method of claim 1 , further comprising controlling the drill bit by changing a rotation speed of the drilling string or a rotation speed of the first motor.

4. The method of claim 1 , further comprising changing a trajectory of drilling while the drilling string remains in a rotary mode.

5. The method of claim 4 , wherein changing a trajectory of drilling while the drilling string remains in a rotary mode comprises:

reducing the speed of the drilling string to a neutral drilling speed in which the drilling string speed is substantially equal and opposite to a speed of the first motor; and

changing the direction of the drill bit to change the trajectory of drilling.

6. The method of claim 1 , further comprising:

determining a differential pressure for the bottom hole assembly at a neutral drilling speed;

measuring a differential pressure for the bottom hole assembly during operation; and

using the measured differential pressure to control a speed of the drilling string relative to a neutral drilling speed.

7. The method of claim 1 , further comprising using at least one spatial offset or angular offset to determine a steering solution to move the trajectory of the drilling string back into convergence with a desired drilling geometry.

8. The method of claim 1 , wherein combined rotation speed of the drilling string and the first moter results in a forward rotation speed.

9. The method of claim 1 , wherein a rotation speed of the first motor is greater than the rotation speed of the drilling string.

10. A system for forming a subsurface wellbore, comprising:

a drilling string configured to rotate in a first direction;

a bottom hole assembly comprising a drill bit, the drill bit being configured to form the wellbore;

a first motor located near the end of the drilling string, the first motor being configured to rotate a portion of the bottom hole assembly in a direction opposite to that of the drilling string; and

a second motor configured to rotate the drill bit.

11. The system of claim 10 , further comprising a control system configured to control the drill bit by changing a rotation speed of the drilling string or a rotation speed of the first motor.

12. The system of claim 10 , wherein the first motor is installed in an inverted orientation.

13. The system of claim 10 , wherein the first motor comprises a stator and a rotor, and wherein the rotor is coupled to a driveshaft of the drilling string.

14. The system of claim 13 , wherein the first motor comprises a motor shaft coupled to the rotor, and wherein the motor shaft faces up-hole.

15. The system of claim 14 , wherein the motor shaft is coupled to the drilling string by way of a reverse threaded connection, and wherein the reverse threaded connection is configured to inhibit backing out of the motor shaft relative to the drilling string.

16. The system of claim 14 , wherein the motor shaft is coupled to the drilling string by way of a backoff-protected connection, and wherein the backoff-protected connection is configured to inhibit backing out of the motor shaft relative to the drilling string.

17. The system of claim 10 , wherein the first motor is a straight mud motor, and the second motor is a bent sub or a bent housing steerable mud motor.

18. A system for forming a subsurface wellbore, comprising:

a drilling string;

a first motor located near the end of the drilling string configured to rotate in a direction of rotation opposite that of the drilling string;

a drill bit on an end of the drilling string, the drill bit being configured to form the wellbore;

a second motor configured to rotate the drill bit; and

a non-rotating sensor located on the drilling string.

19. The system of claim 18 , wherein the non-rotating sensor is coupled to the first motor, and wherein the first motor is configured to rotate in counter-rotation to at least a portion of a bottom hole assembly such that the rotation speed of the non-rotating sensor is substantially zero.

20. The system of claim 18 , further comprising a control system configured to control a speed of the first motor to inhibit rotation of the non-rotating sensor.

21. The system of claim 18 , wherein the non-rotating sensor comprises one or more transceivers configured to communicate data for position measurement, and the system further comprises a control system configured to control drilling operations based on data from the one or more transceivers.

22. The system of claim 18 , wherein the first motor is a mud motor.

23. A method for forming a subsurface wellbore, comprising:

operating a drilling string in a first direction of rotation;

operating a first motor located near the end of the drilling string in a direction of rotation opposite that of the drilling string;

rotating a drill bit using a second motor that is coupled to the first motor; and

using at least one spatial offset or angular offset to determine a steering solution to move the trajectory of the drilling string back into convergence with a desired drilling geometry.

24. The method of claim 23 , further comprising controlling a rotation of at least a portion of a bottom hole assembly coupled to the drilling string.

25. The method of claim 23 , further comprising controlling the drill bit by changing a rotation speed of the drilling string or a rotation speed of the first motor.

26. The method of claim 23 , further comprising changing a trajectory of drilling while the drilling string remains in a rotary mode.

27. A method for forming a subsurface wellbore, comprising:

operating a drilling string in a first direction of rotation;

operating a first motor located near the end of the drilling string in a direction of rotation opposite that of the drilling string;

rotating a drill bit using a second motor that is coupled to the first motor;

determining a differential pressure for a bottom hole assembly at a neutral drilling speed;

measuring a differential pressure for the bottom hole assembly during operation; and

using the measured differential pressure to control a speed of the drilling string relative to a neutral drilling speed.

28. The method of claim 27 , further comprising changing a trajectory of drilling while the drilling string remains in a rotary mode.

29. The method of claim 28 , wherein changing a trajectory of drilling while the drilling string remains in a rotary mode comprises:

reducing the speed of the drilling string to a neutral drilling speed in which the drilling string speed is substantially equal and opposite to a speed of the first motor; and

changing the direction of the drill bit to change the trajectory of drilling.

30. A system for forming a subsurface wellbore, comprising:

a drilling string configured to rotate in a first direction;

a bottom hole assembly comprising a drill bit, the drill bit being configured to form the wellbore;

a first motor located near the end of the drilling string, the first motor being configured to rotate a portion of the bottom hole assembly in a direction opposite to that of the drilling string, wherein the first motor is installed in an inverted orientation.