Drill rig apparatus

• US 3,942,593 A
• Filed: 10/17/1973
• Issued: 03/09/1976
• Est. Priority Date: 10/17/1973
• Status: Expired due to Term

• Current Assignee: Ingersoll-Rand Oilfield Products Company
• Original Assignee: Cabot Corporation
• Inventors: Welch, Raymond L., Walker, Elbert, Moore, Hermus C. Jr., Busse, Ralph, Jones, Milton P., Reeve, John R. Jr.
• Primary Examiner(s): Abbott, Frank L.
• Assistant Examiner(s): Pate, III, William F.
• Application Number:
  US05/407,098
• Time in Patent Office: 874 Days
• Field of Search: 52/116-121, 173/151, 173/23, 175/85, 254/139.1, 211/60 S
• US Class Current: 173/186
• CPC Class Codes: E21B 15/00 Supports for the drilling machine, e.g. derricks or masts
• CPC Class Codes: E21B 7/023 the mast being foldable or telescopically retractable

Abstract

There is disclosed herein a mobile well drilling rig apparatus adapted for rapid assembly and disassembly thereof. The drilling rigs of the invention comprise a trailerable telescoping mast assembly and a separate sectionable substructure assembly therefor comprising a rig base, a working floor mounted in spaced relation above the base and a rig base extension extending outwardly from the drawworks side of the rig base. In a preferred embodiment, rail means defining a mastway are provided between the erected working floor and the rig base extension. The base mast section of the telescoping mast assembly is provided with cooperative mast roller means whereby the base of the mast structure is readily conveyed to the working floor and whereby the drawworks side mast legs are engaged into a trunnion arrangement therefor. Means are also provided for raising of the mast structure to the vertical from the drawworks side of the rig.

Claims

1. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base by means of a plurality of freely slidable and lockable support members stationed therebetween, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

2. The drill rig apparatus of claim 1 wherein said plurality of telescoping support members, in the retracted condition, provide a working floor/rig base assembly of a height sufficiently low as to be trailerable as a single package.

3. The drill rig apparatus of claim 1 wherein each said telescoping support member comprises a relatively larger diameter upper tubular member and a relatively smaller diameter lower tubular member, said tubular members being adapted to nest one over the other in telescoping relationship, and means to lock said larger and smaller tubular members together.

4. The drill rig apparatus of claim 1 wherein at least two diagonally opposed tubular support members each has affixed thereto a drop-leg safety support member of a length adapted to drop to the vertical and to position the free end thereof just above the surface of said rig base when said working floor is erected to a height slightly greater than the working height thereof above said rig base.

7. The drill rig apparatus of claim 1 wherein said adjustment means comprise a pair of independently controllable manipulating hydraulic cylinders each attached at one working end thereof to said rig base extension and which cylinders are adapted to be attached at their respective other working ends to each side of the base mast section of said telescoping mast assembly.

5. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations, said rig base extension comprising parallel guideways spaced as to engage the tires of self-propelled or trailered vehicles and thereby position same on the extension;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

6. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations, said rig base extension comprising means to adjust the height of the base mast section of the substantially horizontal telescoping mast assembly of (E) stationed thereon during extension and retraction;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks said of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

8. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations, said rig base extension being provided with at least one pair of vertically oriented stop means located to either side of a roadable mast assembly stationed thereon, said stop means being adapted to limit side play of said mast assembly during extension or retraction thereof;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a subtantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

9. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side, said rig base comprising a trackway embracing the well hole site thereof, said trackway extending laterally or to the V-door side of said well hole site and a blowout preventer dolly adapted for stationing on said trackway;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

10. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal adjustable-length bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

11. The drill rig apparatus of claim 10 wherein said adjustable length bracing element comprises a relatively longer upper beam section and a relatively substantially shorter lower beam section and jackscrew means interposed therebetween.

12. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal parallel bracing elements spaced equidistantly to each side of the longitudinal axis of said rig base extension, each said element being secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B) and each said bracing element having a mast guide rail along the upper surface thereof;

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the base mast section comprising mast roller means adapted to cooperatively engage with said mast guide rails of (D) and the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

13. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension and said rig base together defining a T-shaped planform, said rig base extension constituting the leg of the T, and said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg memebers of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

14. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side, and, opposite thereto, a V-door side, said rig base additionally comprising a set-back rig base coextensive therewith and extending to the V-door side of the rig;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table, trunnion means located on the drawworks side of said floor and a separable set-back working floor coextensive with said working floor and extending to the V-door side of the rig, said set-back working floor being supported by means of a plurality of support members interposed between said set-back rig base and said set-back working floor;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

15. The drill rig apparatus of claim 14 wherein said set-back working floor is provided with at least one handling winch means.

16. The drill rig apparatus of claim 15 wherein said winch means is hydraulically powered.

17. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means to raise the mast assembly of (E) to the vertical on the working floor of (B), said mast raising means comprising a pair of hydraulic ram means, each said hydraulic ram means having a working attachment at one end thereof to the drawworks side of the base mast section of said mast assembly and having a working attachment at the other end thereof to said rig base extension.

18. The drill rig apparatus of claim 17 wherein said hydraulic ram raising means are attached at one end thereof to their respective working attach points of the drawworks side of the base mast section of the mast assembly and wherein said base mast section is provided with means adapted to secure the other ends of said hydraulic ram raising means to the drawworks side of said base mast section during roading thereof.

19. The drill rig apparatus of claim 17 wherein each said hydraulic raising ram means is of a multi-stage, double-acting type.

20. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up, said adaption for roading including a kingpin or fifth wheel assembly located on the drawworks side of said crown and being adapted for cooperative engagement with a corresponding fifth wheel or kingpin arrangement of a tractor vehicle and a detachable bogie secured to said base mast section;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

21. The drill rig apparatus of claim 20 wherein said kingpin or fifth wheel assembly of said crown is adapted for temporary articulation about the roll axis of the telescoping mast assembly load during extension and retraction thereof.

22. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship and said mast assembly comprising a racking board, located on the V-door side, adapted to pivot and nest over the crown of the retracted mast assembly,

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

23. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually covergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor;

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B); and

H. a removable travelling block cradle adapted to nest in the base section of said mast assembly in the retracted condition thereof.

24. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor;

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B); and

H. a reserve travelling block cable spool means adapted to nest into the V-door side of said mast assembly in the retracted condition thereof.

25. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly comprising a ladderway from the base to the crown thereof, said ladderway being pivotally attached to the mast sections to station said ladderway adjacent the respective mast sections during retraction, roading and extension of the mast assembly and to swing away in a parallel manner from said mast sections upon extension and raising of the mast assembly to the vertical on the working floor of the rig;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with a V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

26. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

said base mast section having affixed near one of the corners thereof and in swiveling relationship thereto a standpipe equipped at its top with a gooseneck and means to secure said gooseneck adjacent said mast assembly during roading thereof;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

27. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the end of each leg member of each mast section being provided with means for establishing and maintaining straight-line concentric positioning thereof with the end of its corresponding leg member of the adjacent mast section; and

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

28. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereon in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

the lower ends of the V-door side mast leg members of said base mast section being equipped with means for vertical adjustment thereof with respect to said working floor;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor; and

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B).

31. The drill rig apparatus of claim 28 wherein each said vertical adjustment means of (E) comprises a jackscrew.

29. A mobile drill rig apparatus comprising:

A. a rig base having a drawworks side and, opposite thereto, a V-door side;

B. a working floor adapted for erection in spaced relationship above said rig base, said working floor comprising a rotary table and, located on the drawworks side of said floor, trunnion means;

C. a rig base extension extending from the drawworks side of said rig base and separable therefrom, said rig base extension defining a ground-based platform of a size and shape adapted for stationing the roadable mast assembly of (E) thereon during erection and takedown of the mast assembly and for stationing a drawworks/rotary table power group thereon during drilling operations;

D. at least two diagonal bracing elements each secured at one end thereof to said rig base extension and, at the other end thereof, to the erected working floor of (B);

E. a roadable telescoping mast assembly composed of mast sections including a base mast section and a crown mast section, said mast assembly having four leg members extending in a substantially mutually convergent manner from the base to the crown thereof, said leg members defining the four corners of the mast assembly;

said mast assembly having a V-door side and, opposite thereto, a drawworks side;

said mast assembly being adapted for roading thereof in the retracted condition and in a substantially horizontal position with the V-door side thereof up;

the lower ends of the drawworks side mast leg members of said base mast section being equipped with trunnion engaging means adapted to engage said trunnion means of the working floor of (B) in substantially vertically pivotal relationship;

F. means to raise the base mast section of the roadable mast assembly of (E) from its horizontal position located on the rig base extension of (C) to the erected working floor of (B) and means to bring said trunnion engaging means into engagement with said trunnion means of said working floor;

G. mast raising means located on the drawworks side of the rig assembly to raise the mast assembly of (E) to the vertical on the working floor of (B); and

H. vertical adjustment means for each drawworks side mast section leg member of said base mast section and each trunnion means of the working floor corresponding thereto.

30. The drill rig apparatus of claim 29 wherein each said vertical adjustment means comprises a hydraulic jack located on the working floor and positioned under the trunnion engaging means of its associated drawworks side base mast section leg member.