Patent Publication Number: US-10323473-B2

Title: Modular racker system for a drilling rig

Description:
TECHNICAL FIELD 
     The present disclosure is directed to systems, devices, and methods for efficiently assembling and disassembling at least a portion of a drilling rig. More specifically, the present disclosure is directed to systems, devices, and methods utilizing a modular column pipe racker system on a drilling rig that may be efficiently assembled or disassembled. 
     BACKGROUND OF THE DISCLOSURE 
     The exploration and production of hydrocarbons require the use of numerous types of tubulars also referred to as pipes. Tubulars include, but are not limited to, drill pipes, casings, tubing, risers, and other threadably connectable elements used in well structures. The connection of “strings” of joined tubulars or “drill strings” is often used to drill a wellbore and, with regards to casing, prevent collapse of the wellbore after drilling. These tubulars are normally assembled in groups of two or more commonly known as “stands.” 
     Tubular handling systems, also known as racker systems, on drilling rigs are often used to receive tubulars, manipulate them about the rig, assist in the makeup or breakdown of tubular stands, introduce them for connection into the drill string, receive them from the drill string, and perform other tubular manipulations. These racker systems can be large, complex structures with many components and parts that enable them to move the stands to a desired location and to vertically store them in the derrick or mast. The derrick or mast may include a storing structure commonly referred to as a fingerboard. Fingerboards typically include a plurality of horizontally elongated support structures or “fingers” each capable of receiving a plurality of stands. 
     Land-based mobile drilling rigs are utilized to drill wells at a first location, and then are often moved to a new second location to drill additional wells. The time period for tearing down a rig, transporting it and setting it up in a new location can vary between days and weeks. However, any downtime of the drilling rig results in high costs with little return. In order to minimize this loss in potential revenue, efficient rig tear down and setup are desirable. Current column pipe racker assemblies are not utilized on the land-based mobile drilling rigs and are confined to permanent drilling rig installations in the offshore. Because of their many large components and pieces, their installation requires the use of many cranes and take a relatively large amount of time. The large components, complex installation requirements and lengthy time for installation result in column rackers utilized on fixed drilling installations and Mobile Offshore Drilling Units (MODU). What is needed is a racker system that is more easily torn down and setup and designed to work with land-based mobile drilling rigs. 
     The present disclosure is directed to systems and methods that overcome one or more of the shortcomings of the prior art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure is best understood from the following detailed description when read with the accompanying figures. It is emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG. 1  is a schematic of an exemplary drilling rig according to one or more aspects of the present disclosure. 
         FIG. 2  is a schematic of top view of an exemplary drilling rig according to one or more aspects of the present disclosure. 
         FIG. 3  is a schematic of an isometric view of an exemplary racker system according to one or more aspects of the present disclosure. 
         FIG. 4  is a schematic of an exploded isometric view of the exemplary racker system showing exemplary modules according to one or more aspects of the present disclosure. 
         FIG. 5  is a schematic of a bottom plan view of an upper track module of the exemplary racker system of  FIG. 4  according to one or more aspects of the present disclosure. 
         FIG. 6  is a schematic of a perspective view of a lower track module of the exemplary racker system of  FIG. 4  according to one or more aspects of the present disclosure. 
         FIG. 7  is a perspective view of an upper track module and a portion of a racker column module of the exemplary racker system of  FIG. 4  according to one or more aspects of the present disclosure. 
         FIG. 8  is a perspective view of a lower track module and a portion of a racker column module of the exemplary racker system of  FIG. 4  according to one or more aspects of the present disclosure. 
         FIG. 9  is an exemplary flowchart of a process for assembling and disassembling a modular racker system according to one or more aspects of the present disclosure. 
         FIG. 10  is a perspective view of a portion of an exemplary lower track module of an exemplary racker system according to one or more aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     It is to be understood that the following disclosure provides many different embodiments, or examples, for implementing different features of various embodiments. Specific examples of components and arrangements are described below to simplify the present disclosure. These are merely examples and are not intended to be limiting. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Moreover, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed interposing the first and second features, such that the first and second features may not be in direct contact. 
     The systems, devices, and methods described herein relate to a drilling rig apparatus that includes a modular racker system. The modules of the racker system connect together and disconnect in a manner that simplifies the setup and the tear down of the racker system when the drilling rig apparatus is to be moved to a new location. The modules may be moved as a part of the drilling rig apparatus from one drilling location to another drilling location, or may be moved from one drilling rig apparatus to a separate other drilling rig apparatus. Since the racker apparatus comprises modules, the setup and tear down may be accomplished in a minimal amount of time, decreasing down time required between moves. In addition, because the racker system is modular, one module may replace a worn or unusable module in a minimal amount of time, without requiring extensive disassembly of a whole racker system. This may reduce the amount of time required for repairs and, likewise, may increase productivity. 
     This disclosure discusses components that are permanently fixed together to form a module of the racker system. As used herein, the term “permanently fixed” means that the components are mechanically fixed or maintained together as an assembly and are intended to stay fixed or maintained together during assembly, disassembly, and/or operation of the racker system or drilling rig. The components may be in either direct contact or indirect contact. The term “permanently fixed” does not mean that the components are unable to be disassembled for other purposes such as repair of worn or broken elements, for permanent takedown, cleaning, refurbishing, recycling, or other purposes. 
       FIG. 1  is a schematic of a side view an exemplary drilling rig apparatus  100  according to one or more aspects of the present disclosure. In some examples, the drilling rig apparatus  100  may form a part of a land-based, mobile drilling rig. The drilling rig apparatus  100  may have a drillfloor size of about 35×35 feet, although larger and smaller rigs are contemplated. In some embodiments, the drilling rig apparatus  100  may have a drillfloor size of less than approximately 1540 square feet. In other embodiments, the drilling rig apparatus  100  may have a drillfloor size of less than approximately 1720 square feet. 
     The drilling rig apparatus  100  shown in  FIG. 1  includes rig-based structures  102  and a modular racker system  104  that operates on the rig-based structures  102 . The rig-based structures  102  include, for example, a foundational chassis or rig frame (not shown), a mast  106 , and a v-door  172  into the drilling rig apparatus  100 . The v-door  172  may be arranged to receive tubulars or stands introduced to the drilling rig apparatus  100 . In an embodiment, the mast  106  is disposed over and about well-center  107  and supports a plurality of drilling components of a drilling system, shown here as a top drive  109  and its components disposed and moveable along a support column  111 . Other drilling components are also contemplated. 
     This embodiment includes an offline mousehole  164  that may be used to assemble tubulars into stands at a location spaced apart from the well-center  107  so as to not interfere with drilling at the well-center  107 . In some embodiments, the mousehole  164  is located above a shallow hole below a rig floor  101  that is offline from well-center  107 , where individual tubulars may be assembled together into stands, e.g. a plurality, such as three tubulars together that are then racked in the fingerboard  108  for later use or storage. The racker system  104  is described in greater detail below. 
     A rig control system  161  may control the racker system  104  and other rig components, while also communicating with sensors disposed about the drilling rig apparatus  100 . The rig control system  161  may evaluate data from the sensors, evaluate the state of wear of individual tubulars or stands, and may make recommendations regarding validation of tubulars for a particular use as a part of a drilling operation. In some embodiments, the rig control system  161  may be disposed on the rig floor  101 , such as in a driller&#39;s cabin, may be disposed in a control truck off the rig floor  101 , or may be disposed elsewhere about the drilling site. In some embodiments, the rig control system  161  is disposed remote from the drilling site, such as in a central drill monitoring facility remote from the drill site. 
     A catwalk  162  forms a part of the drilling rig apparatus  100  and may be directly attached to or disposed adjacent the rig floor  101 . The catwalk  162  allows the introduction of drilling equipment, and in particular tubulars or stands, to the v-door  172  of the drilling rig apparatus  100 . In some embodiments, the catwalk  162  is a simple, solid ramp along which tubulars may be pushed or pulled until the tubular can be grasped or secured by the upper tubular interfacing element  105  of the racker system  104 . In other embodiments, the catwalk  162  is formed with a conveyer structure, such as a belt-driven conveyer that helps advance the tubulars toward or away from the drilling rig apparatus  100 . Other embodiments include friction reducing elements, such as rollers, bearings, or other structures that enable the tubulars to advance along the catwalk toward or away from the v-door  172 . It should be noted that where land rigs utilize catwalks, offshore rigs utilize conveyors to transport tubulars from the pipe deck to the rig floor  101 . Therefore, it should be understood that description of the present disclosure use in a land rig may also be utilized in an offshore rig. 
       FIG. 2  is a schematic of top view of the exemplary drilling rig apparatus  100  according to one or more aspects of the present disclosure.  FIG. 2  illustrates the fingerboard  108  and other portions of the racker system  104 , the stands  176 , fingers  132  forming a part of the fingerboard  108 , an iron roughneck  170 , the mousehole  164 , and the well-center  107 , all as generally described above. The iron roughneck  170  may be used to connect and disconnect tubulars or stands at either or both of the well-center  107  and the mousehole  164 . A passageway  168  may extend between opposing sides of the fingerboard  108  between the v-door  172  and the well-center  107 . The racker system  104  may travel along the passageway  168  indicated by the arrow in  FIG. 2  to manipulate tubulars or stands between the fingerboard  108 , the mousehole  164 , the well-center  107 , and the v-door  172 , and it may travel laterally to a position, such as a parking position, out of the passageway and out of the pathway between well-center  107  and the v-door  172 . 
       FIGS. 3 and 4  show the racker system  104  in greater detail. They include an upper track module  112 , a racker column module  114 , and a lower track module  116 . In  FIG. 3 , the upper track module  112 , the racker column module  114 , and the lower track module  116  are shown connected in place for operation, while  FIG. 4  shows the upper track module  112 , the racker column module  114 , and the lower track module  116  in an exploded condition. The modules may be separated from one another for transport to a new location while still substantially maintaining their own respective assembled states. In some embodiments, however, the modules may still require some level of packing or unpacking, such as folding or collapsing to a more compact state for transport, and unfolding or extending for reuse. Because of this, the modules may also be easily and quickly interchanged with other similar modules, such as by including quick release components to attach and retain modules to each other, and quick connectors to permit simple “plug n&#39; play” with electrical and hydraulic connectors. This may help expedite repairs, because a replacement module may be introduced in place of an older worn or broken module, and the worn or broken module may be removed and entirely fixed offline while the new module is used to keep the racker system  104  and the drilling rig apparatus  100  in operation. In another embodiment, the replacement module is swapped in during transport of the modules from one rig or rig site to another. 
     Referring now to  FIGS. 4 and 5 , the upper track module  112  includes, for example, the fingerboard  108 , upper rails  120 , an upper carriage that includes an upper cart housing  122  and an upper cart drive  124 , a rotational union  126  for the column structure, and a festoon system  128 . 
     The fingerboard  108  is a holding or storage area for stands that have been or will be used to build the drill string. These stands may be stored in the fingerboard  108  until they are used or broken down for removal from the drilling rig apparatus  100 . The fingerboard  108  includes an outer support frame  130  having a plurality of individual fingers  132  extending in a parallel direction and cantilevered from the support frame  130 . The upper portions of the stands may be inserted between the fingers  132  and thereby held in place, in a substantially vertical position for storage. As can be seen, in this embodiment, the fingerboard  108  includes a left side and a right side, with the passageway  168  therebetween. Support structure  134  extends from the support frame  130  along the passageway  168  and supports the upper rails  120 . In some embodiments, the fingerboard  108  of the upper track module  112  is arranged and configured to attach to and be supported by the mast  106  ( FIG. 1 ). In some examples, it is cantilevered from the mast and extends over a portion of the drilling rig floor  101 . Other embodiments include a support structure, such as a derrick that supports the fingerboard  108 , and the upper rack module  112 . 
     The upper rails  120  are, in this exemplary embodiment, suspended from the support structure  134  of the fingerboard  108  and form an upper track for the upper cart housing  122 . The upper rails  120  are permanently fixed to the fingerboard  108 , and therefore are not disconnected from the fingerboard  108  during rig assembly, disassembly, or during transport. Accordingly, when the fingerboard  108  is attached to the mast  106 , there is little or no additional work or effort required to assemble and attach the upper rails  120 . The upper rails  120  extend along the passageway  168  ( FIG. 2 ) between opposing sides of the fingerboard between the v-door  172  and well-center  107 . In the embodiment shown, the upper rails  120  curve or extend to a position outside the passageway  168  so that the upper cart housing  122  can travel to a position that may be used to park the racker column module  114  to the side of the pathway  168  between the v-door and well center. Accordingly, the upper rails  120  in this embodiment form an L-shape. Here, there are two upper rails  120 , however, other embodiments include additional or fewer rails, or include other structures such as the upper track. 
     The upper cart housing  122  is securely connected to the upper rails  120  and moves along the upper rails  120  via the upper cart drive  124 . In some embodiments, the upper cart housing  122  is permanently fixed to the upper rails  120 , and therefore is not disconnected from the upper rails  120  during rig assembly, disassembly, or during transport. In such embodiments, when the fingerboard  108  is attached to the mast  106 , there is little or no additional work or effort required to assemble and attach the upper cart housing to the upper rails  120 . In the embodiments shown, the upper cart housing  122  is arranged to carry the upper cart drive  124  and the rotational union  126 . In this embodiment, the upper cart housing  122  includes wheels and bearings enabling it to travel along the upper rails  120 , under the power of the upper cart drive  124 . Other embodiments have the upper cart drive  124  displaced from the upper cart housing  122 , and the upper cart housing  122  is driven by a belt, chain drive, conveyor, or other system that is powered by the upper cart drive  124  to move the upper cart housing  122  along the upper rails  120 . In some embodiments, the upper cart drive  124  is a motor arranged to move the upper cart housing  122  along the upper rails  120 . 
     The upper cart housing  122  of the upper track module  112  is configured to move the upper portion of the racker column module  114  along the upper rails  120 . The upper cart housing  122  may include rollers, sliding pads, or other structures that facilitate movement of the racker column module  114  between the v-door  172 , mousehole  164 , and well-center  107  below the mast  106 . In some embodiments, the upper cart housing  122  is a part of a chain structure that drives the racker column module  114  along the passageway  168  formed to accommodate the racker column module  114  through the fingerboard  108 . 
     The upper cart housing  122  carries the rotational union  126 , which engages the racker column module  114 . This rotational union  126  is configured to removeably attach to the racker column module  114 . A festoon system  134  is attached to and extends along the upper rails  120  and it is configured to carry one or more electrical, hydraulic, or other cables, hoses, and wires  135  for the operation of the upper track module  112 , the racker column module  114 , and the lower track module  116 . Depending on the embodiment, one, two, or all of the upper cart drive  124 , the rotational union  126 , and the festoon system  134  are permanently fixed to the fingerboard  108 , and therefore are not disconnected from the fingerboard  108  during rig assembly, disassembly, or during transport. 
     The racker column module  114 , shown in  FIG. 4 , includes a column  140 , a hoisting system  142 , a middle arm assembly  144 , a lower arm assembly  146 , a housing  148 , and a motor and braking system  150 . The racker column module  114  extends between and connects with the upper track module  112  and the lower track module  116 . Depending on the embodiment, one, two, three, four or all of the hoisting system  142 , the middle arm assembly  144 , the lower arm assembly  146 , the housing  148 , and the motor and braking system  150  are permanently fixed to the column  140  or a portion of the column, and therefore are not disconnected from the column  140  or a portion of the column during rig assembly, disassembly, or during transport. 
     The column  140  of the racker column module  114  provides rigidity and support to the racker system  104 , provides structural support of the middle and lower arm assemblies  144 ,  146 , and connects the upper track module  112  to the lower track module  116 . The column  140  may be formed of a single solid beam or a plurality of beams joined together end to end. In some embodiments, the column  140  includes two parallel plates, spaced apart to hold the middle and lower arm assemblies  144 ,  146  therebetween. 
     In this example, the hoisting system  142  is disposed at the top end of the column  140  and receives electric or hydraulic operating power from cables or hoses carried on the upper track module  112 . The hoisting system  142  may include a cable extending to the middle arm assembly  144  and may be used to raise and lower the middle arm assembly  144  along the column  140 . 
     The middle arm assembly  144  slides vertically along the column  140  and may be extended or manipulated to grasp the upper end of tubulars, carry, move or otherwise displace a tubular. In some embodiments, the middle arm assembly  144  may move upward or downward on rollers, slide pads, or other elements disposed on the column  140  or carried on the middle arm assembly. The lower arm assembly  146  is, in the exemplary embodiment shown, pivotably attached in place on the lower portion of the column  140 . 
     Each of the middle arm assembly  144  and the lower arm assembly  146  includes a manipulator arm  152  and a gripper head  154 . The gripper heads  154  may be sized and shaped to open and close and to grasp or retain tubing, such as tubulars or stands. The manipulator arms  152  may move the gripper heads  154  toward and away from the column  140 . 
     The middle arm assembly  144  and the lower arm assembly  146  are configured to reach out to insert a drill pipe stand into or remove a drill pipe stand from fingerboard  108 . That is, they extend outwardly from the column  140  to clamp onto or otherwise secure a drill pipe stand that is in the fingerboard  108  or to place a drill pipe stand in the fingerboard  108 . In addition, the middle arm assembly  144  and the lower arm assembly  146  are configured to reach out to receive tubulars introduced to the drilling rig apparatus  100  through the v-door  172  and to carry tubulars or stands from the v-door  172  or the fingerboard  108  to the mousehole  164  or to the well-center  107  for hand-off to the drilling elements, such as the top drive  109 . As indicated above, the middle arm assembly  144  may move vertically up and down along the racker column  140 . In some aspects, it is operated by the hoisting system  142 . 
     The housing  148  forms the lower portion of the column assembly  114 . The housing  148  carries the weight of the racker column  140  and, as is described further herein with reference to  FIG. 8 , interfaces with the lower track module  116 . The housing  148  can be seen best in  FIGS. 4 and 8 , and is arranged to provide a secure foundation for the racker column module  114 . With reference to  FIG. 8 , the housing  148  includes a gear driven transmission system with a projecting pinion gear  155  that is configured to interface with the lower track module  116 . The housing  148  also provides a powered rotational capacity to rotate the column  140  about its axis. Accordingly, during use, while the housing  148  may not rotate, the column  140  may be arranged to spin in order to accomplish desired tasks. 
     The motor and braking system  150  is, in the exemplary embodiments shown, carried on the housing  148  and is configured to rotate the projecting pinion gear  155 . It does this through the transmission system in the housing  148  and powers a lower carriage forming a part of the lower track module as is described herein. It is also configured to rotate, through the same or a separate portion of the transmission system, the column  140 . In this embodiment, the motor and braking system  150  is disposed as a part of the racker column module  114 . It powers the lower carriage through the interface between the racker column module  114  and the lower track module  116 . The motor and braking system  150  may include one or more of an electric motor, a hydraulic motor, or other motor that is arranged to turn the projecting pinion gear  155  and drive the lower track module  116 . In some embodiments, the motor is powered by the hoses or cables extending along the upper track module  112 , and by additional hoses or cables extending downwardly along the column  140 . Depending on the embodiment, these hoses or cables are respectively permanently fixed to the column  140  or the festoon system  134 , and therefore are not disconnected from the column  140  or the festoon system  134  during rig assembly, disassembly, or during transport. Accordingly, in this example, power to drive the motor and braking system  150  is obtained via connections made between the upper track module  112  and the racker column module  114 . It should be understood that multiple motors, types of motors, and/or pinion gears can be used. Since the motor and braking system  150  provides power to the lower carriage, in some embodiments, there are no separate cables or hoses connected to the lower track module  116 . 
     The lower track module  116 , best shown in  FIGS. 4 and 6 , forms and includes at least a part of the rig floor  101  ( FIG. 1 ). In this exemplary embodiment, the lower track module  116  includes a rig floor portion with a lower track  220  and a lower carriage including a pair of wheel yokes  222  and a lower trolley  224 . In the exemplary embodiment shown, the lower track  220  is formed of a floor structure having a longitudinal gap  240  formed therein. The lower track  220  is permanently fixed to a portion of the rig floor  101 , and therefore is not disconnected from the portion of the rig floor  101  during rig assembly, disassembly, or during transport. Accordingly, when the portion of the rig floor  101  is installed on the rig support structure (such as a rig frame, chassis, trusses, etc.), there is little or no additional work or effort required to assemble and attach the lower track  220 . 
     The walls or sides of the gap  240  in the lower track  220  guide the direction and movement of the lower trolley  224  as it advances along the track  220 . In this example, at least one of the wheel yokes  222  or the lower trolley  224  includes a projecting element (not shown) that is arranged to extend into the gap  240  and maintain the direction of movement.  FIG. 10  shows an exemplary lower track portion with a different lower carriage disposed thereon. In this embodiment, the lower track  220  comprises a gear rack  402  along its underside that extends along the gap  240  and is properly spaced from the gap  240  to engage a gear  404  that extends from the lower trolley  224  of the lower carriage. With the gear rack  402  on the underside of the lower track  220 , the upper surface of the lower track  220  and also the rig floor can be maintained relatively flat. The gear rack in this embodiment is permanently fixed to the lower track, which is permanently fixed or otherwise forms a part of the rig floor. Additional details regarding the exemplary gear rack on the underside of the lower track  220  is shown in U.S. patent application Ser. No. 14/279,986, filed May 16, 2014, titled “Parking System for a Pipe Racker on a Drilling Rig”, expressly incorporated herein in its entirety by express reference thereto. 
     The wheel yokes  222  forming a part of the lower carriage are configured to extend over and along the gap  240  in the lower track  220 . In this embodiment, there are two wheel yokes  222 , with each having a protruding guide  242  that extends into the gap  240 . As the wheel yokes  222  advance along the lower track  220 , the protruding guide maintains the wheel yokes  222  on course. In some embodiments, the wheel yokes  222  extend through the gap  240  in the lower track  220  and extend under the solid lower track  220  in a manner that mechanically prevents removal from the lower track  220 . Thus, the wheel yokes  222  may be mechanically connected to the lower track  220  in a manner that allows them to be transported together without disassembly. 
     The lower trolley  224  forming a part of the lower carriage rests on and is carried by the wheel yokes  222 . It is configured to be disposed directly under the racker column module  114  and to carry the weight of the racker column module  114 . Accordingly, the column module  114  may interface with the lower trolley  224  and may provide power from the motor and braking system  150  to drive the lower trolley  224  along the lower track  220 . In this embodiment, the lower trolley  224  includes an extending pinion gear that engages the rack gear (not shown) disposed on the underside of the lower track  220  and rotates to advance the racker column module  114 , carried by the wheel yokes  222 , along the lower track  220 . As best seen in  FIG. 6 , the lower trolley  224  includes a support surface  246  and a central receiving recess  248  that is arranged to interface with the projecting pinion gear  155  ( FIG. 8 ) of the housing  148 . Connectors, shown here as upwardly projecting posts  250 , are shaped and configured to be received in corresponding openings in the housing  148  to connect the lower trolley  224  of the lower track module  116  to the housing  148  of the racker column module  114 . Stabilizers  252  also provide structural support to prevent rotation of the lower trolley  224  and the housing  148 . 
     Depending on the embodiment, the wheel yokes  222 , the lower trolley  224 , or any other element of the lower carriage are permanently fixed to the lower track  200 , and therefore are not disconnected from the lower track during rig assembly, disassembly, or during transport. 
       FIGS. 7 and 8  show the interfacing components of the upper track module  112 , the column module  114 , and the lower track module  116 . Referring first to  FIG. 7 , the hoisting system  142  at the upper end of the column  140  includes an engagement structure  212  that connects with the rotational union  126 . In the embodiment shown, the rotational union  126  may be stabbed into a receiving portion of the engagement structure  212  to mechanically connect the upper track module  112  and the racker column module  114 . In other embodiments, the engagement structure  212  or other engagement structure is stabbed into the upper carriage forming a part of the upper track module  112 . This physical connection permits the column  140  to rotate around its axis while connected to and carried by the upper cart housing  122 . Accordingly, when the upper cart housing  122  is powered to drive along the upper rails  120 , the top portion of the racker column module  114  is carried along the upper rails  120  also. In some embodiments, the hoisting system  142  is disposed elsewhere along the racker column module  114  and the interface between the modules occurs directly with the column  140  and the upper track module  112 . In some embodiments, the hoisting system  142  forms a part of the upper track module  112  and is used to hoist the middle arm assembly  144  during operation. 
     The interfacing connection between the upper track module  112  and the column module  114  are selectively attachable so that during operation they are fixed together, yet can be disconnected from each other so that each module may be separately removed from the drilling rig apparatus  100  during disassembly and then separately transported to a new location. Alternatively, they may be disassembled and replaced with a separate module in the event of repair or maintenance. 
       FIG. 8  shows the interface between the racker column module  114  and the lower track module  116  ready to be connected together. During assembly, the projecting pinion gear  155  carried on the housing  148  is stabbed into the central receiving recess  248 , and the posts  250  are aligned with and received in the corresponding receiving holes in flanges of the housing  148 . The connection may be secured with additional bolts, pins, or other elements. For example, pins may be inserted through receiving holes in the posts  250  to prevent the racker column module from inadvertently separating from the lower carriage. In an exemplary embodiment, quick connect/release fasteners are used for rapid exchange of modules. With the projecting pinion gear  155  extending into the lower trolley  224 , a gear system in the lower trolley  224  can be used to drive a corresponding pinion gear (not shown) extending through the gap  240  of the lower track  220 . The corresponding pinion gear may be engaged with a gear rack on the underside of the lower track  220 . Accordingly, as the motor and braking system  150  rotates the projection pinion gear  155 , the projecting pinion gear  155  rotates a corresponding gear on the lower trolley  224  to advance the lower trolley  224  and the attached wheel yokes  222  along the lower track  220 . 
       FIG. 9  shows an exemplary method of assembling and disassembling a modular racker system, such as the racker system  104  for use on the drilling rig apparatus  100 . The method begins at  302  and includes transporting the upper track module, the lower track module and the racker column module to a drill site. Since the lower track module includes the rig drillfloor with the lower track and the upper track module includes the upper racker track assembled with the fingerboard, transporting these components in an assembled state reduces transport loading and unloading time, and as set forth herein, may increase operational efficiency by reducing rig setup and teardown times. 
     At  304 , the rig floor is assembled. This may include laying out and securing the rig drillfloor sections to a structural chassis or frame forming the rig foundation of the drilling rig apparatus  100 . Since sections of the rig drillfloor include the lower track, and in some embodiments, the lower carriage, including the wheel yokes  222  and the lower trolley  224 , the lower track module  116  is installed and in position when the rig drillfloor is installed. In addition, the lower carriage may be installed when the rig drillfloor is installed. 
     At  306 , the upper track module is raised above the rig drillfloor and attached to the rig mast. This might include supporting the fingerboard via a connection to the mast so that the fingerboard cantilevers away from the mast. Since the upper track is attached to the fingerboard, the upper track is also set up and supported by the mast when the upper track module is attached to the mast. Thus, the fingerboard and the upper track are setup together at the same time. 
     At  308 , the racker column module is assembled or setup on the ground. This may include connecting components, arranging, or otherwise setting up the racker column module. Since some embodiments of the racker column module include electrical/hydraulic cables or hoses  178  (as shown in  FIG. 4 ) already permanently fixed and in place on the racker column, efficiencies in assembly of the racker column module can be achieved. 
     At  310 , the racker column module  114  is aligned with and secured to the upper track module  112 . In the exemplary embodiment described herein, this includes connecting the rotational union  126  to a top portion of the racker column module  112  so that the racker column module  114  can rotate relative to the upper track module  112 . In some embodiments, this includes stabbing in the column module  112  to components of the upper track module  112 , such as the upper drive cart  124 , the rotational union  126 , or other structure forming a part of the upper carriage. Stabbing the column module  112  may include raising or lifting all or a portion of the racker column module  112  above the rig drillfloor. 
     At  312 , the lower track module  116  is aligned with and secured to the racker column module  114 . This may include stabbing a portion of one of the racker column module and the lower track module into the other so that they are mechanically connected and securely attached to one another. In some examples, this includes aligning the lower carriage under the racker column module  114  while the racker column module  114  is raised and stabbed into the upper carriage. Accordingly, with the racker column module  114  above the drill rig floor, the lower carriage is aligned along the lower track to be under the racker column module, and the racker column module is lowered onto the lower carriage. In embodiments described herein, lowering the racker column module onto the lower carriage includes stabbing the projection pinion gear  155  into a central receiving recess  248  in the lower trolley  224  so that power from the racker column module may be transmitted to the lower track module. 
     At  314 , electrical or hydraulic connections are made to connect the upper track module to the racker column module. Since in the exemplary embodiment described, the hoses or cables already form a part of the upper track module and the racker column module, there is no need to run the hoses and cables during the assembly process. In some embodiments, the hoses and cables provide electric or hydraulic power to the motor and braking system  150 , the housing  148 , and the middle and lower arm assemblies  144 ,  146  on the racker column module  114 . With this arrangement, connections need only be made at one location to connect (or to disconnect) to the upper and lower track modules. In some embodiments, it also provides electrical or hydraulic power to the lower track module through the racker column module. In embodiments where the lower track module requires electrical or hydraulic connection, those connections may also be made to connect hoses or cables that make up a portion of the respective modules. 
     At  316 , the assembled racker system  104  is used to perform a drilling rig operation, such as manipulate tubulars, makeup or breakdown stands, or perform other functions. 
     When desired, the racker system  104  may be disassembled for transportation to a new drill site. This process is in many respects simply the reverse of the setup process, and not all steps or elements are repeated in the same level of detail as above. Disassembly however may begin at  318  by disconnecting the electrical or hydraulic connections on the upper track module from the connections on the racker column module. 
     At  320 , the racker column module is disconnected from the lower track module by raising the racker column module to separate it from the lower carriage, and the lower carriage or the racker column module may be moved so that the carriage is not under the racker column module. At  322 , the racker column module is disconnected from the upper track module. This may include lowering the racker column module so that the interfering structure that was stabbed into the upper column module is removed from the upper column module. At  324 , the racker column module is disassembled for transport. At  326 , the upper track module is removed from the mast by removing the fingerboard and lowering it to the ground and preparing it, with the lower track and other upper track module components, for transport. At  328 , the drill rig floor is disassembled into sections, with the lower track forming a part of at least one of the drillfloor sections. At  3320 , the modules are transported to a second drill site for reassembly onto a drilling rig. Since the modules are transported in an assembled or a partially assembled state including with attached electrical cables and/or hydraulic hoses, the assembly and disassembly of the drilling rig apparatus may be expedited, resulting in more efficient, and therefore less expensive, rig operations. 
     While the modules described herein have certain components associated therewith, it should be understand that the modules may be arranged so that different components form a part of different modules. For example and without limitation, the motor and braking system  150  carried on the racker column module may alternatively be carried on the lower track module. Other components may be likewise redistributed depending on the racker device arrangement. In addition, not all modules have all the components identified in the exemplary racker disclosed herein. For example, some rackers may have fewer arm assemblies than what are disclosed here. Likewise, because of its length, some embodiments of the racker column module  114  may be broken down further, for example, with a first module including a column portion and the middle arm assembly and a second module including a column portion and the lower arm portion, with the arm portions still attached to and forming a part of the column during assembly, disassembly, or transport. 
     In view of all of the above and the figures, one of ordinary skill in the art will readily recognize that the present disclosure introduces a drilling rig apparatus that includes a transportable lower track module comprising a drilling rig floor comprising a lower track arranged and configured to accommodate a lower carriage. The lower track may be permanently fixed to the drilling rig floor so as to form a part of the drilling rig floor and being transportable as part of the drilling rig floor. A racker column is operably attachable to the lower carriage track module. A transportable upper track module includes a fingerboard and an upper track arranged and configured to accommodate an upper carriage moveable along the upper track. The upper track is permanently fixed to the fingerboard and is transportable in a connected configuration. The upper track module is operably attachable to the racker column. 
     In an aspect, the racker column forms a part of a racker column module that also comprises an arm assembly permanently fixed to the racker column and a hoisting system arranged to raise and lower the arm assembly along the racker column. In an aspect, the lower track module comprises a lower carriage attached to and moveable along the lower track, the lower carriage comprising a portion extending through the lower track in a manner that retains the lower carriage in place on the lower track during transportation. In an aspect, the upper track of the upper track module and the lower track of the lower track module each have a portion forming an L-shape. In an aspect, the upper track module comprises an upper carriage permanently fixed to and moveable along the upper track, the upper carriage being connected to the upper track in a manner that retains the upper carriage in place on the lower track during transportation. In an aspect, the racker column forms a part of a racker column module comprising a motor and braking system arranged to power the lower carriage of the lower track module when operably connected thereto. In an aspect, the lower track module includes the lower carriage permanently fixed to the lower track. The lower carriage includes a support surface configured to support the racker column, and one of a projecting gear and a receiving recess. The racker column forms a part of a racker column module including the other of the projecting gear and the receiving recess. The projecting gear is arranged to fit within the receiving recess connecting the rack column module and the lower carriage. 
     In another aspect, the present disclosure introduces a drilling rig apparatus that includes a transportable lower track module comprising a portion of a drilling rig floor comprising a lower track arranged and configured to accommodate a lower carriage. The lower track is permanently fixed to a part of the drilling rig floor and is transportable as a part of the drilling rig floor. A transportable racker column module is selectively attachable to the lower carriage track module. The racker column module comprises a racker column and an arm assembly permanently fixed to the column and arranged to manipulate a tubular. A transportable upper track module includes a fingerboard and an upper track arranged and configured to accommodate an upper carriage moveable along the upper track. The upper track module is permanently fixed to the fingerboard and comprises a connector element configured to couple with the racker column module. 
     In an aspect, the lower track module comprises a lower carriage permanently fixed to and moveable along the lower track, the lower carriage comprising a portion extending through the lower track in a manner that retains the lower carriage in place on the lower track during transportation. In an aspect, the upper track of the upper track module and the lower track of the lower track module each have a portion forming an L-shape. In an aspect, the upper track module comprises an upper carriage permanently fixed to and moveable along the upper track, the upper carriage being connected to the upper track in a manner that retains the upper carriage in place on the lower track during transportation. In an aspect, the racker column module comprises a hoisting system permanently fixed to the column and a second arm assembly moveable with the hoisting system. In an aspect, the racker column module comprises a motor and braking system permanently fixed to the column and arranged to power the lower carriage of the lower track module when operably connected thereto. 
     In another aspect, the present disclosure introduces a method of modifying a rig which comprises: installing a lower track module on a drilling rig apparatus, the lower track module comprising a lower track permanently fixed to a drilling rig floor, the lower track arranged and configured to accommodate a lower carriage; connecting a racker column to the lower track module in a manner that a lower carriage transports the racker column along the lower track; and connecting an upper track module to the racker column, the upper track module comprising a fingerboard permanently fixed to upper track that is arranged and configured to accommodate an upper carriage moveable along the upper track in a manner that an upper carriage of the upper track module transports the racker column along an upper track of the upper track module. 
     In an aspect, connecting the racker column to the lower track module comprises connecting a racker column module that includes extendable arms for grasping a tubular to the lower track module. In an aspect, the method includes connecting one or more electrical cables or hydraulic hoses of the racker column to an electrical cable or hydraulic hose of the upper track module. In an aspect, the racker column forms a part of a racker column module, and wherein connecting an upper track module to the racker column comprises stabbing a component carried by one of the upper track module and the racker column module into the other of the upper track module and the racker column module. In an aspect, the racker column forms a part of a racker column module, and wherein connecting the racker column to the lower track module comprises stabbing a component carried by one of the racker column module and the lower track module into the other of the racker column module and the lower track module. In an aspect, the method includes disconnecting the upper track module from the racker column; disconnecting the lower track module from the racker column; and transporting the lower track module and the upper track module to a new location with the lower carriage connected to the lower track and with the upper carriage connected to the upper track. In an aspect, the racker column forms a portion of a racker column module, and the method further comprises driving the lower carriage along the track with a motor forming a part of the racker column module. 
     The foregoing outlines features of several embodiments so that a person of ordinary skill in the art may better understand the aspects of the present disclosure. Such features may be replaced by any one of numerous equivalent alternatives, only some of which are disclosed herein. One of ordinary skill in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. One of ordinary skill in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions and alterations herein without departing from the spirit and scope of the present disclosure. 
     The Abstract at the end of this disclosure is provided to comply with 37 C.F.R. § 1.72(b) to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 
     Moreover, it is the express intention of the applicant not to invoke 35 U.S.C. § 112(f) for any limitations of any of the claims herein, except for those in which the claim expressly uses the word “means” together with an associated function.