Downhole mobility module for logging and intervention of extended reach wells

1. A mobility module for navigating through a passageway having a varying diameter comprising:

a central support member including first and second longitudinal ends positioned at longitudinal extremities of the module taken as a whole;

first and second expandable and collapsible linkages movable at least radially relative to the central support member;

a first casing coupled to the central support member via the first expandable and collapsible linkage, the first casing having an external surface including a first movable track;

a second casing coupled to an opposite side of the central support member from the first casing, the second casing coupled to the central support member via the second expandable and collapsible linkage and including an external surface including a second movable track; and

wheels rotatably mounted on the central support member adjacent to the at least one of the first and second longitudinal ends.

2. The mobility module of claim 1 , wherein a diameter of the module from the external surface of the first casing to the external surface of the second casing, when the first and second linkages are collapsed fully, is sized to permit unimpeded movement in a well while the diameter of the module when the linkages are expanded fully is sized to engage the well and restrict movement of the mobility module.

3. The mobility module of claim 1 , wherein a diameter of the module from the external surface of the first casing to the external surface of the second casing when the first and second linkages are expanded fully is in the range of 8.5 inches to 9.5 inches.

4. The mobility module of claim 1 , wherein a diameter of the module from the external surface of the first casing to the external surface of the second casing when the first and second linkages are collapsed fully is in the range of 2.5 inches to 3 inches.

5. The mobility module of claim 1 , wherein the first and second casings are elongated longitudinally and include tapered longitudinal ends.

6. The mobility module of claim 1 , wherein the first and second movable tracks further comprise at least one of a belt or chain.

7. The mobility module of claim 1 , further comprising an electronic control unit and a wireless communication module, wherein the first and second linkages and the first and second movable tracks are controlled by the electronic control unit, and wherein the electronic unit is operative to receive operator commands via the wireless communication module to control the first and second linkages and the first and second movable tracks.

8. A robotic device for navigating through a passageway having a varying diameter comprising:

at least two mobility modules positioned longitudinally with respect to each other, each of the at least two mobility modules including a central support member including first and second longitudinal ends positioned at longitudinal extremities of the module taken as a whole, a first casing coupled to the first central support member via a first expandable and collapsible linkage, the first casing having an external surface including a first movable track, and a second casing coupled to an opposite side of the first central support member from the first casing, the second casing coupled to the first central support member via a second expandable and collapsible linkage and including an external surface including a second movable track; and

wheels rotatably mounted on the central support member adjacent at least one of the longitudinal ends,

wherein each of the at least two modules is coupled longitudinally to at least one other mobility module via a pivotable coupling.

9. The robotic device of claim 8 , wherein the at least two mobility modules comprises more than three mobility modules.

10. The robotic device of claim 8 , wherein the at least two mobility modules each have a diameter measured from the external surface of a respective first casing to the external surface of a respective second casing, wherein the first and second linkages of the respective casings collapse fully to size the first and second mobility modules for unimpeded movement in a well and expand fully to size the first and second mobility modules for fixed engagement with the well.

11. The robotic device of claim 8 , wherein a diameter of the at least two mobility modules from the external surface of the first casing to the external surface of the second casing when the first and second linkages are expanded fully is 8.5 inches to 9.5 inches.

12. The robotic device of claim 8 , wherein a diameter of the at least two mobility modules from the external surface of the first casing to the external surface of the second casing when the first and second linkages are collapsed fully is 2.5 inches to 3 inches.

13. The robotic device of claim 8 , wherein the first and second casings of the at least two mobility modules are elongated longitudinally and include tapered longitudinal ends.

14. The robotic device of claim 8 , wherein the first and second movable tracks of the at least two mobility modules include at least one of a belt or chain.

15. The robotic device of claim 8 , further comprising an electronic control unit and a wireless communication module, wherein the at least two mobility modules are controlled by the electronic control unit, and the electronic unit is operative to receive operator commands via the wireless communication module to control the at least two mobility modules.

16. The mobility module of claim 8 , wherein the at least one mobility module is provides longitudinal locomotion through the passageway via the first and second movable tracks when at least one of the at least two mobility modules is in contact with a wall of the passageway.