Drilling rigs and erection methods

Abstract

Systems and methods for erecting a drilling rig. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention is directed to drilling rigs and to methods for erecting mobile drilling rigs.

2. Description of Related Art

The prior art discloses a variety of rigs used in drilling and various wellbore operations; for example, and not by way of limitation, U.S. Pat. Nos. 3,340,938; 3,807,109; 3,922,825; 3,942,593; 4,269,395; 4,290,495; 4,368,602; 4,489,526; 4,569,168; 4,837,992; 6,634,436; 6,523,319; and 7,306,055 and the references cited in these patents—all these patents incorporated fully herein for all purposes. The prior art discloses a variety of systems and methods for assembling and erecting a drilling rig; for example, and not by way of limitation nor-as an exhaustive listing, the disclosures in U.S. Pat. No. 2,993,570; 3,201,091; 3,262,237; 3,749,183; 4,221,088; 4,269,009; 4,292,772; 4,305,237; 4,478,015; 4,587,778; 4,630,425; and 4,932,175.

Often drilling rigs and related systems, structures, equipment, and apparatuses are delivered to a site, assembled, raised, disassembled, and transported to a new site. It is important that drilling rigs and their components be easily transported, assembled, and erected.

In many prior rigs and erection methods, rig components and structures used with a rig are raised by a crane and positioned on a rig's drill floor. Various problems and disadvantages are associated with using a crane. A crane is typically a large apparatus which is transported to a drilling site where it is assembled and/or made ready for lifting and locating rig components.

BRIEF SUMMARY OF THE INVENTION

The present invention, in certain aspects, provides a drilling rig with structure manipulation and erection apparatus and methods for using such apparatus to erect a rig without using a crane, without winching up cables, and without lifting items and equipment with a drawworks.

The present invention discloses, in certain aspects, a method for assembling a drilling rig, the method including: assembling a substructure of a drilling rig, the assembly including connecting an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space; moving with a vehicle on ground a floor section connected to and supported by the vehicle into open space including the upper open space and the lower open space; and securing the floor section to the substructure.

The present invention discloses, in certain aspects, a method for assembling a drilling rig, the method including: assembling a substructure of a drilling rig, the assembly including connecting an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space; moving with a vehicle on ground a floor section connected to and supported by the vehicle into open space including the upper open space and the lower open space; and securing the floor section to the substructure; disconnecting the floor section from the vehicle; moving the vehicle away from the drilling rig; installing a drawworks (or other rig apparatus) on the substructure; assembling a mast connected to the substructure; erecting the mast on the substructure; installing a rig structure on the substructure; and raising with raising apparatus the substructure to an operational height.

The present invention discloses, in certain aspects, a system for drilling including: a substructure, the substructure locatable on ground and having an open space; a floor section, the floor section movable with a vehicle on ground adjacent the substructure, the floor section connected to and supported by the vehicle and movable on the vehicle into the open space; and the floor section releasably connected to the substructure.

The present invention discloses, in certain aspects, a substructure for a drilling rig, the substructure including: an upper box with an upper open space; a lower box with a lower open space; the upper open space above the lower open space and comprising a substructure space; the substructure space sized for selective receipt therein of a vehicle; and a floor section connectable to and supportable by the vehicle for movement into the substructure space, the floor section connected to the substructure.

Accordingly, the present invention includes features and advantages which are believed to enable it to advance drilling rig technology and rig erection technology. Characteristics and advantages of the present invention described above and additional features and benefits will be readily apparent to those skilled in the art upon consideration of the following detailed description of preferred embodiments and referring to the accompanying drawings.

Certain embodiments of this invention are not limited to any particular individual feature disclosed here, but include combinations of them distinguished from the prior art in their structures, functions, and/or results achieved. Features of the invention have been broadly described so that the detailed descriptions that follow may be better understood, and in order that the contributions of this invention to the arts may be better appreciated. There are, of course, additional aspects of the invention described below and which may be included in the subject matter of the claims to this invention. Those skilled in the art who have the benefit of this invention, its teachings, and suggestions will appreciate that the conceptions of this disclosure may be used as a creative basis for designing other structures, methods and systems for carrying out and practicing the present invention. The claims of this invention are to be read to include any legally equivalent devices or methods which do not depart from the spirit and scope of the present invention.

What follows are some of, but not all, the objects of this invention. In addition to the specific objects stated below for at least certain preferred embodiments of the invention, there are other objects and purposes which will be readily apparent to one of skill in this art who has the benefit of this invention's teachings and disclosures. It is, therefore, an object of at least certain preferred embodiments of the present invention to provide the embodiments and aspects listed above and:

New, useful, unique, efficient, non-obvious drilling rigs; rig erection methods; and new, useful, unique, efficient, nonobvious rig structure for rig erection; and

Such systems and methods in which a central drill floor portion is connected to a drill floor without a crane.

The present invention recognizes and addresses the problems and needs in this area and provides a solution to those problems and a satisfactory meeting of those needs in its various possible embodiments and equivalents thereof. To one of skill in this art who has the benefits of this invention's realizations, teachings, disclosures, and suggestions, various purposes and advantages will be appreciated from the following description of preferred embodiments, given for the purpose of disclosure, when taken in conjunction with the accompanying drawings. The detail in these descriptions is not intended to thwart this patent's object to claim this invention no matter how others may later attempt to disguise it by variations in form or additions of further improvements.

The Abstract that is part hereof is to enable the U.S. Patent and Trademark Office and the public generally, and scientists, engineers, researchers, and practitioners in the art who are not familiar with patent terms or legal terms of phraseology to determine quickly from a cursory inspection or review the nature and general area of the disclosure of this invention. The Abstract is neither intended to define the invention, which is done by the claims, nor is it intended to be limiting of the scope of the invention or of the claims in any way.

It will be understood that the various embodiments of the present invention may include one, some, or all of the disclosed, described, and/or enumerated improvements and/or technical advantages and/or elements in claims to this invention.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or equivalent embodiments.

FIG. 1A is a top view of part of an upper box of a drilling rig according to the present invention.

FIG. 1B is a top view of the upper box of FIG. 1A above a base box of the rig according to the present invention.

FIG. 1C is a top view of base box of FIG. 1B.

FIG. 1D is an top view of the upper box and of the base box of FIG. 1B.

FIG. 2A is a top view of a step in a method for the assembly of rig according to the present invention for installing a drawworks.

FIG. 2B is a top view of a further step in the assembly method for the assembly of rig according to the present invention.

FIG. 2C is a side view of the step of FIG. 2B.

FIG. 2D is a top view showing the drawworks installed on the rig.

FIG. 3A is a top view of a step in a method for the assembly of rig according to the present invention for installing a mast.

FIG. 3B is a side view of a further step in the assembly method for installing the mast.

FIG. 3C is a side view of a further step in installing the mast.

FIG. 3D shows the mast erected.

FIG. 4A is a top view of a step in a method for the assembly of rig according to the present invention for installing a center floor on the rig.

FIG. 4B is a top view of a further step in the assembly method for installing the center floor.

FIG. 4C is a side view of a further step in installing the center floor.

FIG. 4D is a side view of a further step in installing the center floor.

FIG. 4E is a top view of a further step in the assembly method for installing the center floor.

FIG. 5A is a side view of a step in a method for the assembly of rig according to the present invention for installing a rig structure, e.g., a doghouse, on the rig.

FIG. 5B is a top view of a further step in the assembly method for installing the doghouse.

FIG. 5C is an end view of the step of FIG. 5B.

FIG. 5D is a side view of a further step in installing doghouse.

FIG. 6A is a side view of a step in a method for the assembly of rig according to the present invention for raising the rig.

FIG. 6B is a side view of a further step in the assembly method for raising the rig.

FIG. 6C is a side view of a further step in raising the rig.

FIG. 6D is a side view of a further step in raising the rig.

FIG. 6E is a top view of a further step in raising the rig.

FIG. 6F is a top view of the rig floor of the rig of FIG. 6D.

FIG. 7A is a top view of part of a rig as in FIG. 6F.

FIG. 7B is a side view showing a connection of parts of the rig of FIG. 7A after installation and FIG. 7B is a view along-line-A-A of FIG. 7A.

FIG. 7C is a side view showing a connection of parts of the rig of FIG. 7A before installation.

FIG. 7D is a side view showing a connection of parts of the rig of FIG. 7A after installation and FIG. 7D is a view along line B-B of FIG. 7A.

FIG. 7E is a side view showing a connection of parts of the rig of FIG. 7A before installation.

FIG. 7F is a side view showing a connection of parts of the rig of FIG. 7A after installation and FIG. 7F is a view along line C-C of FIG. 7A.

FIG. 7G is a side view showing a connection of parts of the rig of FIG. 7A before installation.

FIG. 7H is a side view showing a connection of parts of the rig of FIG. 7A after installation and FIG. 7H is a view along line D-D of FIG. 7A.

FIG. 7I is a side view showing a connection of parts of the rig of FIG. 7A before installation.

Presently preferred embodiments of the invention are shown in the above-identified figures and described in detail below. Various aspects and features of embodiments of the invention are described below and some are set out in the dependent claims. Any combination of aspects and/or features described below or shown in the dependent claims can be used except where such aspects and/or features are mutually exclusive. It should be understood that the appended drawings and description herein are of preferred embodiments and are not intended to limit the invention or the appended claims. On the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims. In showing and describing the preferred embodiments, like or identical reference numerals are used to identify common or similar elements. The figures are not necessarily to scale and certain features and certain views of the figures may be shown exaggerated in scale or in schematic in the interest of clarity and conciseness.

As used herein and throughout all the various portions (and headings) of this patent, the terms “invention”, “present invention” and variations thereof mean one or more embodiment, and are not intended to mean the claimed invention of any particular appended claim(s) or all of the appended claims. Accordingly, the subject or topic of each such reference is not automatically or necessarily part of, or required by, any particular claim(s) merely because of such reference. So long as they are not mutually exclusive or contradictory any aspect or feature or combination of aspects or features of any embodiment disclosed herein may be used in any other embodiment disclosed herein.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 6A-6D show a rig 10 according to the present invention erected by a method according to the present invention.

FIG. 1A shows an upper box 12 of a substructure 20 or the rig 10 according to the present invention. FIG. 1B shows the upper box 12 above a base box 14 of the rig substructure 20. The upper box 12 includes side floor section 12a, side floor section 12b, upper box beam 12c which includes parts 12d and 12e. The parts 12d and 12e pivot, respectively, about pivot connections 12f, 12g and these have ends which are releasably connectable to each other with a pin 12h as shown in FIG. 1D. Braces 12i, 12j are pivotably connected to pivot connections 12k, 12m, respectively and are pivotable to releasably connect to the parts 12d, 12e at points 12n, 12p, respectively, as shown in FIG. 1D. Optionally, the rig 10 has pivotable suspension arms 121, 122 which are useful in securing an item, e.g. a rig structure such as a doghouse DH (see FIG. 6F) to the rig.

The base box 14 includes a side structure 14a and a side structure 14b; a base box beam 14c; a base box beam 14d; a base box beam 14e; a substructure raising cylinder 14f; and a substructure raising cylinder 14g.

As shown in FIG. 1C, the base box beam 14c has been pivoted about a pivotal connection 14h and releasably connected to a connection 14i on the side structure 14a. The base box beam 14d has been pivoted about a pivotal connection 14i and releasably connected to a connection 14k on the side structure 14a. The base box beam 14e has been pivoted about a pivotal connection 14m and releasably connected to a connection 14n on the side structure 14a. This releasably connects the base side structure 14a to the base side structure 14b with respect to a well center WC.

As shown in FIG. 1D, the parts 12d, 12e of the upper box beam 12c have been pivoted and their ends have been releasably connected with the pin 12h. The braces 12i, 12j have been pivoted and connected to the parts 12d, 12e, respectively.

The combination of the upper box 12 and the base box 14 form the basic structure of the rig substructure 20.

FIGS. 2A-2D illustrate the installation of a drawworks 16 on the substructure 20. It is within the scope of the present invention for the drawworks 16 to be installed on the substructure 20 in any known way using any known structure, apparatus, machines and devices; and using any known drill floor and/or upper box, including, but not limited to, an upper box with a floor portion for supporting the drawworks. Alternatively, the drawworks 16 is installed as described in the U.S. Patent Application filed on even date herewith, naming Donnally et al as inventors, and entitled “Drilling Rig Drawworks Installation”; co-owned with the present invention and incorporated fully herein for all purposes. FIGS. 2A-2D illustrate one drawworks installation method.

As shown in FIG. 2A a truck Ta with a trailer Tb pulls alongside the substructure 20. The trailer Tb supports the drawworks 16 which is on a skid 16s. As shown in FIGS. 2B and 2C the truck Ta positions the trailer Tb in a desired position with respect to the substructure 20 and the skid 16s of the drawworks 16 is connected to the substructure 20. Alternatively the upper box 12 includes a support floor for the drawworks 16. The substructure 20 includes pivotable supports 20s, substructure raising cylinder apparatuses 20a, and mast raising cylinder apparatuses 20b.

FIGS. 3A-3D illustrate the installation of a mast 18 on the substructure 20 and the raising of the mast 18. It is within the scope of the present invention to install any suitable known mast on the substructure 20 and to install the mast using any DQ 210 known method and apparatus. Alternatively, the mast 18 is installed as described in the U.S. Patent Application co-owned with the present invention, naming Donnally et al as inventors, filed on even date herewith, and entitled “Drilling Rig Masts And Methods For Erecting Masts”; and incorporated fully herein for all purposes. FIGS. 3A-3D illustrate one mast installation method. The rig shown includes a doghouse support arm 18t.

As shown in FIG. 3A, the substructure 20 has been lowered using the substructure cylinder apparatuses 14f, 14g and the base box beam 14e has been disconnected from the connection 14n and pivoted out of the way making room for part of the mast to be moved into place between the side structures 14a, 14b. Legs 20a are pivotably connected to the substructure. As shown in FIG. 3B a truck Tc with a trailer Td supporting a bottom mast section 18a has moved the bottom mast section 18a between the side structures 14a, 14b. The mast raising cylinder apparatuses 20b are connected to the mast bottom section 18a and both the substructure raising cylinder apparatuses 14f, 14g and the mast raising cylinder apparatuses 20b are then extended to raise the mast bottom section 18a above the trailer Td. The truck Tc is then moved away.

As shown in FIG. 3C, with the bottom mast section 18a connected to the upper box 12 a truck Te with a trailer Tf supporting a mid mast section 18b has moved the mid mast section 18b adjacent the bottom mast section 18a.

The bottom mast section 18a is connected to the mid mast section 18b; in one aspect, employing the substructure raising cylinder apparatuses 14f, 14g and the mast raising cylinder apparatuses 20b to position the mast sections and facilitate their interengagement. The truck Te is then moved away; in one aspect, the truck Te is moved away following retraction of the substructure raising cylinder apparatuses 14f, 14g, and extension of the mast raising cylinder apparatuses 20b. As shown in FIG. 3D, but prior to erecting the mast 18, a racking board 18r may be opened on the mast 18.

As shown in FIG. 3D, the mast 18 is erected, e.g., by extending the mast raising cylinder apparatuses. The mast bottom section 18a is secured to the mast mid section 18b and, if used, the mast raising cylinder apparatuses are then retracted.

FIGS. 4A-4E illustrate a method according to the present invention for the installation of a center floor section 19.

As shown in FIG. 4A, the braces 12i, 12j have been released from the parts 12d, 12e, respectively, pivoted on their respective connections 12k, 12m; and moved out of the way. As shown in FIG. 4B, the base box beam 14d has been released from its connection 14k; pivoted on its connection 14i; and moved out of the way.

As shown in FIG. 4C, a truck Tg with a trailer Th supporting a center floor section 19 has moved the center floor section 19 adjacent the substructure 20. The center floor section 19, optionally, includes a rotary table 19a. As shown in FIG. 4D, the truck Tg moves the center floor section 19 between the parts of the upper box 14 and base box 12 and the center floor section 19 is connected to the upper box 14. The truck Tg and trailer Th are moved away. The braces 12i, 12j are then reconnected (see FIG. 4E).

FIGS. 5A-5D illustrate the installation of a rig structure (e.g. house, cabin, control room, doghouse, driller cabin) on the substructure 20. It is within the scope of the present invention to use any known apparatus and method for installing a rig structure on the substructure. Alternatively, the rig structure (e.g. a doghouse 17) is installed on the substructure 20 as described in the U.S. Application filed on even date herewith entitled “Drilling Rig Structure Installation And Methods”; co-owned with the present invention; and incorporated fully herein for all purposes.

As shown in FIGS. 5A-5C, the doghouse 17 supported on a trailer Tj of a truck Ti is moved into position adjacent the substructure 20 and the substructure 20 has been lowered. The doghouse 17 is connected to the substructure 20 and the truck Ti and trailer Tj are then moved away (FIG. 5D).

FIGS. 6A-6D illustrate the raising of the substructure 20 to move the rig 10 into a working position.

As shown in FIG. 6A, the substructure 20 is lowered to install drawworks skid support legs 16a; various equipment and apparatuses; e.g., (see FIG. 6F) an iron roughneck 24; air tugger winches 25a; an independent rotary drive 25b; and a rotary table 25c (if not already installed) over a well center WC and near a mousehole MH (any of which optionally may be installed on the center section before installation on the substructure); and other equipment and hand rails.

As shown in FIG. 6B, the substructure 20 is raised using the substructure raising cylinder apparatuses, raising the upper box 12, the mast 18, and the other equipment. A bottom end of each of the legs 16a is pinned to the base box 14. The base box beams 14d and 14e are pivoted and reconnected to the connections 14k, 14m, respectively. A BOP support beam structure 14s is connected to the base box 14. Support legs 14t are connected between the upper box 12 and the base box 4. If the mast 18 is a telescoping mast, the mid mast section 18b is telescoped up from the bottom mast section 18a (FIG. 6C). As shown in FIG. 6D the rig 10 is erected and, optionally, a rig walker 28 (for rig movement) is installed on the base box 14.

FIG. 6F is a top view of the upper box 12 with the drawworks 16, doghouse 17, and center floor 19 installed.

FIGS. 7A-7F illustrate structure for connection of various parts of the rig as in FIG. 6F; shown with a drawworks deleted.

FIGS. 7A-7F illustrate various connection structures both before the center floor 19 is installed and after the center floor 19 is installed.

FIGS. 7B-7C illustrate the connection of beams B1 and B2 with pins Pa.

FIGS. 7D-7E illustrate the connection of parts P1 and P2.

FIGS. 7G-7F illustrate the connection of parts P3 and P4.

FIGS. 7H-7I illustrate the connection of parts P5 and P6.

The present invention, therefore, provides in some, but not in necessarily all, embodiments a method for assembling a drilling rig, the method including: assembling a substructure of a drilling rig, the assembly including connecting an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space; moving with a vehicle on ground a floor section connected to and supported by the vehicle into open space including the upper open space and the lower open space; and securing the floor section to the substructure. Such a method may one or some, in any possible combination, of the following: disconnecting the floor section from the vehicle, and moving the vehicle away from the drilling rig; installing a drawworks (or rig apparatus) on the substructure; assembling a mast connected to the substructure; erecting the mast on the substructure; installing a rig structure on the substructure; wherein the rig structure is one of doghouse, cabin, and control room; installing rig equipment on the substructure; wherein the rig equipment is one of winch, iron roughneck, independent rotary table drive, and rotary table; and/or raising with raising apparatus the substructure to an operational height.

The present invention, therefore, provides in some, but not in necessarily all, embodiments a method for assembling a drilling rig, the method including: assembling a substructure of a drilling rig, the assembly including connecting an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space; moving with a vehicle on ground a floor section connected to and supported by the vehicle into open space including the upper open space and the lower open space; and securing the floor section to the substructure; disconnecting the floor section from the vehicle; moving the vehicle away from the drilling rig; installing a drawworks (or rig apparatus) on the substructure; assembling a mast connected to the substructure; erecting the mast on the substructure; installing a rig structure on the substructure; and raising with raising apparatus the substructure to an operational height.

The present invention, therefore, provides in some, but not in necessarily all, embodiments a system for drilling including: a substructure, the substructure locatable on ground and including an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space; a floor section, the floor section movable with a vehicle on ground adjacent the substructure, the floor section connected to and supported by the vehicle and movable on the vehicle into an open space including the upper open space and the lower open space; and the floor section releasably connected to the substructure. Such a system may one or some, in any possible combination, of the following: a drawworks (or rig apparatus) on the substructure; a mast connected to the substructure; a rig structure on the substructure; wherein the rig structure is one of doghouse, cabin, and control room; rig equipment on the substructure; wherein the rig equipment is one of winch, iron roughneck, independent rotary table drive, and rotary table; and/or raising apparatus connected to the substructure for raising the substructure to an operational height.

The present invention, therefore, provides in some, but not in necessarily all, embodiments a substructure for a drilling rig, the substructure including: an upper box with an upper open space; a lower box with a lower open space; the upper open space above the lower open space and comprising a substructure space; the substructure space sized for selective receipt therein of a vehicle; and a floor section connectable to and supportable by the vehicle for movement into the substructure space, the floor section connected to the substructure.

The systems and methods of the inventions described in the following pending U.S. Patent Applications, co-owned with the present invention, filed on even date herewith, naming Donnally et al as inventors, and fully incorporated herein for all purposes, may be used with certain embodiments of the present invention, the applications entitled: “Drilling Rig Masts And Methods Of Assembly and Erection”; “Drilling Rig Structure Installation And Methods”; and “Drilling Rig Drawworks Installation”.

In conclusion, therefore, it is seen that the present invention and the embodiments disclosed herein and those covered by the appended claims are well adapted to carry out the objectives and obtain the ends set forth. Certain changes can be made in the subject matter without departing from the spirit and the scope of this invention. It is realized that changes are possible within the scope of this invention and it is further intended that each element or step recited in any of the following claims is to be understood as referring to the step literally and/or to all equivalent elements or steps. The following claims are intended to cover the invention as broadly as legally possible in whatever form it may be utilized. The invention claimed herein is new and novel in accordance with 35 U.S.C. § 102 and satisfies the conditions for patentability in § 102. The invention claimed herein is not obvious in accordance with 35 U.S.C. § 103 and satisfies the conditions for patentability in § 103. This specification and the claims that follow are in accordance with all of the requirements of 35 U.S.C. § 112. The inventors may rely on the Doctrine of Equivalents to determine and assess the scope of their invention and of the claims that follow as they may pertain to apparatus not materially departing from, but outside of, the literal scope of the invention as set forth in the following claims. All patents and applications identified herein are incorporated fully herein for all purposes. It is the express intention of the applicant not to invoke 35 U.S.C. § 112, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function. In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are including, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.

Claims

1. A method for assembling a drilling rig, the method comprising assembling a substructure of a drilling rig, the assembly comprising connecting an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space,moving with a vehicle on ground a floor section connected to and supported by the vehicle into open space including the upper open space and the lower open space, andsecuring the floor section to the substructure.

2. The method of claim 1 further comprising disconnecting the floor section from the vehicle, andmoving the vehicle away from the drilling rig.

3. The method of claim 1 further comprising installing a drawworks on the substructure.

4. The method of claim 1 further comprising assembling a mast connected to the substructure.

5. The method of claim 4 further comprising erecting the mast on the substructure.

6. The method of claim 1 further comprising installing a rig structure on the substructure.

7. The method of claim 6 wherein the rig structure is one of doghouse, cabin, and control room.

8. The method of claim 1 further comprising installing rig equipment on the substructure.

9. The method of claim 8 wherein the rig equipment is one of winch, iron roughneck, independent rotary table drive, and rotary table.

10. The method of claim 1 further comprising raising with raising apparatus the substructure to an operational height.

11. A method for assembling a drilling rig, the method comprising assembling a substructure of a drilling rig, the assembly comprising connecting an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space,moving with a vehicle on ground a floor section connected to and supported by the vehicle into open space including the upper open space and the lower open space, andsecuring the floor section to the substructure,disconnecting the floor section from the vehicle,moving the vehicle away from the drilling rig,installing a drawworks on the substructure,assembling a mast connected to the substructure,erecting the mast on the substructure,installing a rig structure on the substructure, andraising with raising apparatus the substructure to an operational height.

12. A system for drilling comprising a substructure, the substructure locatable on ground and comprising an upper box to a lower box, the upper box having an upper open space, the lower box having a lower open space, and the upper open space above the lower open space,a floor section, the floor section movable with a vehicle on ground adjacent the substructure, the floor section connected to and supported by the vehicle and movable on the vehicle into an open space including the upper open space and the lower open space, andthe floor section releasably connected to the substructure.

13. The system of claim 12 further comprising a drawworks on the substructure.

14. The system of claim 12 further comprising a mast connected to the substructure.

15. The system of claim 12 further comprising a rig structure on the substructure.

16. The system of claim 15 wherein the rig structure is one of doghouse, cabin, and control room.

17. The system of claim 12 further comprising rig equipment on the substructure.

18. The system of claim 17 wherein the rig equipment is one of winch, iron roughneck, independent rotary table drive, and rotary table.

19. The system of claim 12 further comprising raising apparatus connected to the substructure for raising the substructure to an operational height.

20. A substructure for a drilling rig, the substructure comprising an upper box with an upper open space,a lower box with a lower open space,the upper open space above the lower open space and comprising a substructure space,the substructure space sized for selective receipt therein of a vehicle, anda floor section connectable to and supportable by the vehicle for movement into the substructure space, the floor section connected to the substructure.