Tubular delivery arm for a drilling rig

TUBULAR DELIVERY ARM FOR A DRILLING RIG

CROSS-REFERENCE TO RELATED APPLICATION

[001] The present document claims the benefit of and priority to U.S. Provisional Application Serial No. 62/330012, filed April 29, 2016, and International Application Number PCT/US2016/061956, filed November 15, 2016, both of which are incorporated herein by reference in their entireties.

BACKGROUND

[002] In the exploration of oil, gas and geothermal energy, drilling operations are used to create boreholes, or wells, in the earth. Modem drilling rigs may have two, three, or even four mast sections for sequential connection and raising above a substructure. The drilling rigs are transported to the locations where drilling activity is to be commenced. Once transported, large rig components are moved from a transport trailer into engagement with the other components located on the drilling pad.

[003] Moving a full-size drilling rig requires significant disassembly and reassembly of the substructure, mast, and related component. Speed of disassembly and reassembly impacts profitability but safety is the primary concern. A reduction in disassembly reduces errors and delay in reassembly.

[004] Transportation constraints and cost limit many of the design opportunities for building drilling rigs that can drill a well faster. Conventional drilling involves having a drill bit on the bottom of the well. A bottom-hole assembly is located immediately above the drill bit where directional sensors and communications equipment, batteries, mud motors, and stabilizing equipment are provided to help guide the drill bit to the desired subterranean target.

[005] A set of drill collars are located above the bottom-hole assembly to provide a non- collapsible source of weight to help the drill bit crush the formation. Heavy weight drill pipe is located above the drill collars for safety. The remainder of the drill string is mostly drill pipe, designed to be under tension. Each drill pipe is roughly 30 feet long, but lengths vary based on the style. It is common to store lengths of drill pipe in "doubles" (two connected lengths) or "triples" (three connected lengths) or even "fourables" (four connected lengths). A "tubular stand" refers to connected sections of drill pipe, drill collars, or casing.

[006] When the drill bit wears out, or when service, repairs or adjustments need to be made to the bottom-hole assembly, the drill string (drill pipe and other components) is removed from the wellbore and setback. When removing the entire drill string from the well, it is typically disconnected and setback in doubles or triples until the drill bit is retrieved and exchanged. This process of pulling everything out of the hole and running it all back in the hole is known as "tripping."

[007] Tripping is non-drilling time and, therefore, an expense. Efforts have long been made to devise ways to avoid it or at least speed it up. Running triples is faster than running doubles because it reduces the number of threaded connections to be disconnected and then reconnected. Triples are longer and therefore more difficult to handle due to their length and weight and the natural waveforms that occur when moving them around. Manually handling moving pipe in the derrick and at the drill floor level can be dangerous.

[008] It is desirable to have a drilling rig with the capability to increase safety and reduce trip time. It is desirable to have a drilling rig with the capability of handing stands of drilling tubulars to devices alternative to conventional elevators and top drives.

[009] Most attempts to automate pipe handling are found offshore. However, solutions for pipe delivery on offshore drilling rigs are seldom transferable to onshore land rigs, due to the many differences in economic viability, size, weight, and transportation considerations.

SUMMARY

[010] The disclosed subject matter of the application relates to an independent secondary hoisting machine that is adaptable for use on a conventional drilling rig, or on a specialized drilling rig in combination with other equipment designed to take advantage of the auxiliary hoisting capability.

[011] In some embodiments, a tubular delivery arm is provided that independently travels vertically along a connection to the drilling mast with lifting capacity limited to that of a stand of tubulars, (connected sections of drill collars, drill pipe, or drill casing). The tubular delivery arm has a tilt capability to move the tubular stands horizontally in the drawworks to V-door direction, reaching positions that include the centerlines for the wellbore, stand hand- off position, mousehole, and/or the catwalk.

[012] In some embodiments, the tubular delivery arm comprises a dolly vertically translatably connected to a front side of a mast of the drilling rig. An arm extends below the dolly. A tubular clasp is pivotally connected to a lower end of the arm to engage an upper portion of a tubular stand to raise or lower the tubular stand by the translation of the dolly. An upper end of the arm is rotatably and pivotally connected to the dolly to move the clasp engaging the upper portion of the tubular stand between a well center position and a position forward of the well center position. The tubular clasp is positionable on the tubular stand below an upper end of the tubular stand to secure the upper portion of the tubular stand in the well center position, e.g., for connection and disconnection of the top drive.

[013] In some embodiments, the clasp is slidable along the tubular stand between a position to engage an upper end of the tubular stand, e.g., for raising, lowering and/or horizontal movement, and a position below the upper end to secure the stand in the well center position, e.g., for connection or disconnection of the top drive. As used herein, an end of a tubular stand includes a diametral upset such as a box connection, and/or a threaded portion of the tubular stand for connecting tubulars. In embodiments, the clasp is engageable with a diametral upset at the upper end of the tubular stand, and is slidable or otherwise moveable along the tubular stand below the diametral upset at the upper end for coincident attachment by a top drive at the well center position.

[014] In an embodiment, the clasp comprises a gripper to grip the tubular stand below a diametral upset at the upper end for coincident attachment by a top drive at the well center position.

[015] In any embodiment, the tubular clasp can secure the tubular stand below the upper end for coincident attachment by a top drive at the well center position.

[016] In one embodiment, the tubular delivery arm comprises a dolly vertically translatably connected to a drilling mast. The connection may be sliding as with slide pads or a roller connection or other means. An arm bracket is attached to the dolly. An arm, or pair of arms, extends below the dolly and is pivotally and rotationally connected to the arm bracket of the dolly. An actuator bracket is connected between the arms, or to the arm. A tilt actuator is pivotally connected between the actuator bracket and the dolly or arm bracket. A clasp is pivotally connected to the lower end of the arm, below the dolly. The tilt actuator permits the clasp to swing below the dolly over the centerlines of at least the wellbore and a position forward of the wellbore, e.g., a stand hand-off position. The dolly vertically translates the mast in response to actuation of a hoist at the crown of the mast such as by wireline.

[017] In one embodiment, a centerline of a drill pipe secured in the clasp, e.g., suspended at the upper end or box connection or upset of the pipe, is located between the clasp pivot connections at the lower ends of each arm. In another embodiment, an extendable incline actuator is pivotally connected between each arm and the tubular clasp. Extension of the incline actuators inclines the clasp to permit tilting of heavy tubular stands, such as large collars.

[018] In another embodiment, a rotary actuator is mounted to the arm bracket and has a drive shaft extending through the arm bracket. A drive plate is rotatably connected to the arm bracket and connected to the drive shaft to provide rotation between the dolly and the arm.

[019] In another embodiment, a grease dispenser is attached to the tubular delivery arm proximate to the clasp for dispensing grease into the box connection of a tubular stand secured by the clasp of the tubular delivery arm. This embodiment permits automatic greasing (conventionally known as "doping") the box connection positioned above the clasp.

[020] The tubular delivery arm provides a mechanism for use in a new drilling rig configuration or for adaptation to a conventional drilling rig system to reduce the time for tripping drilling tubulars.

[021] In some embodiments, a method to deliver tubular stands to and from well center comprises: connecting a dolly of a tubular delivery arm to a front side of a mast; rotatably and pivotally connecting an upper end of an arm to extend below the dolly; pivotally connecting a tubular clasp at a lower end of the arm; securing an upper portion of a tubular stand in the clasp; vertically translating the dolly on the front side of the mast to raise or lower the tubular stand secured in the clasp; rotating and tilting the arm to move the tubular stand secured in the clasp between a well center position and a position forward of the well center position; and positioning the tubular clasp below an upper end of the tubular stand to secure the upper portion of the tubular stand in the well center position.

[022] In some embodiments, the method may further comprise connecting or disconnecting a top drive and the tubular stand secured by the clasp in the well center position, and removing the clasp from the tubular stand; and/or connecting or disconnecting a drill string and a lower end of the tubular stand secured by the clasp in the well center position.

[023] In some embodiments, the method may further comprise engaging the clasp with a diametral upset at the upper end of the tubular stand for the vertical translation of the dolly. In some embodiments, the positioning of the tubular clasp below the upper end to secure the upper portion of the tubular stand in the well center position comprises moving the clasp along the tubular stand below the diametral upset. In some embodiments, the positioning of the tubular clasp below the upper end to secure the upper portion of the tubular stand in the well center position comprises engaging the clasp and the tubular stand below the diametral upset, followed by moving the clasp along the tubular stand to engage the diametral upset. In these embodiments, the movement of the clasp along the tubular stand may comprise sliding.

[024] In some embodiments, the method may comprise gripping the tubular stand at or below a diametral upset with the clasp for the vertical translation of the dolly. In embodiments, the positioning of the tubular clasp below the upper end to secure the upper portion of the tubular stand in the well center position comprises gripping the tubular stand with the clasp below a diametral upset. In some embodiments, the method may further comprise gripping the tubular stand below a diametral upset with the clasp for the vertical translation of the dolly and the securing of the upper portion of the tubular stand in the well center position.

[025] As will be understood by one of ordinary skill in the art, the assembly disclosed may be modified and the same advantageous result obtained. It will also be understood that as described, the mechanism can be operated in reverse to remove drill stand lengths of a drill string from a wellbore for orderly bridge crane stacking. Although a configuration related to triples is being described herein, a person of ordinary skill in the art will understand that such description is by example only and would apply equally to doubles and fourables.

BRIEF DESCRIPTION OF THE DRAWINGS

[026] FIG. 1 is an isometric view of an embodiment of a tubular delivery arm for a drilling rig.

[027] FIG. 2 is an isometric exploded view of the embodiment of the tubular delivery arm illustrated in FIG. 1.

[028] FIG. 3 is a side view of another embodiment of the tubular delivery arm illustrated, illustrating the range of the tubular delivery arm to position a suspended tubular stand pipe relative to positions of use on a drilling rig.

[029] FIG. 4 is a side view of an embodiment of the tubular delivery arm connected to a drilling mast and in position to receive a section of drill pipe from the catwalk.

[030] FIG. 5 is an isometric view of the embodiment of the tubular delivery arm of FIG. 4, illustrating the tubular delivery arm receiving a section of drill pipe from the catwalk.

[031] FIG. 6 is a side view of an embodiment of the tubular delivery arm connected to a drilling mast and positioned to receive a tubular stand from, or deliver a section of pipe to, the mousehole. [032] FIG. 7 is a side view of an embodiment of the tubular delivery arm connected to a drilling mast and in position at a height below the top drive to receive (or deliver) a tubular stand at the stand hand-off position at the racking module.

[033] FIG. 8 is an isometric view of the embodiment of the tubular delivery arm of FIG. 7, illustrating the tubular delivery arm positioned over the stand hand-off position between the racking module and the mast, and having the upset of a tubular stand secured in the clasp.

[034] FIG. 9 is a side view of an embodiment of the tubular delivery arm connected to a drilling mast and positioned over a mousehole..

[035] FIG. 10 is an isometric view of the embodiment of the tubular delivery arm of FIG. 9, illustrating the tubular delivery arm articulated over well center after delivering a tubular stand into a stump at the well center, with the clasp moved down the tubular stand, readied to release and hand off the tubular stand when secured by the top drive (or ready to slide or otherwise move up the tubular stand to the upset and hoist it away from well center after disconnection of the top drive).

[036] FIG 11 is an isometric exploded view of an alternative embodiment of the tubular delivery arm.

[037] FIG. 12 a fully assembled isometric view of the alternative embodiment of the tubular delivery arm illustrated in FIG. 11.

[038] FIG. 13 is an isometric view of the embodiment of the tubular delivery arm of FIGS. 11 and 12, illustrating the arms rotated and in position over the well center.

[039] FIG. 14 is a side view of the embodiment of the tubular delivery arm illustrated in FIGS. 11-13, illustrating the range of the tubular delivery arm to position a tubular stand.

[040] FIG. 15 is an isometric view of the embodiment of the tubular delivery arm of FIGS. 11-14, illustrating the tubular delivery arm articulated to the stand hand-off position between the racking module and the mast, and having a tubular stand secured in the clasp.

[041] FIG. 16 is an isometric view of the embodiment of the tubular delivery arm of FIG.

15, illustrating the tubular delivery arm articulated over the well center and handing a tubular stand to the top drive, or receiving the tubular stand from the top drive.

[042] FIG. 17 is an isometric view of the embodiment of the tubular delivery arm of FIG.

16, illustrating the tubular delivery arm articulated to reach an upper end of a tubular stand held by an upper stand constraint component at the stand hand-off position.

[043] FIG. 18 is an isometric view of the embodiment of the tubular delivery arm of FIG.

17, illustrating the upper stand constraint having released (or ready to receive) the tubular stand and the tubular delivery arm hoisting the tubular stand at the box connection as the grease dispenser is lowered to spray grease into the box end of the tubular stand being lifted.

[044] The objects and features of the disclosed embodiments will become more readily understood from the following detailed description and appended claims when read in conjunction with the accompanying drawings in which like numerals represent like elements.

[045] The drawings constitute a part of this specification and include exemplary embodiments which may be embodied in various forms. It is to be understood that in some instances various aspects of the disclosed embodiments may be shown exaggerated or enlarged to facilitate an understanding of the principles and features of the disclosed embodiments.

DETAILED DESCRIPTION

[046] The following description is presented to enable any person skilled in the art to make and use the tubular delivery arm, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from their spirit and scope. Thus, the disclosure is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[047] FIG. 1 is an isometric view of an embodiment of a tubular delivery arm 500. FIG. 2 is an isometric exploded view of this embodiment of tubular delivery arm 500. As best seen in FIG. 2, tubular delivery arm 500 comprises a dolly 510. Dolly 510 is configured for vertically translatable connection to a mast 10 of a drilling rig 1 (see FIG. 4). Dolly 510 has a driller's side end 511 and an opposite off-driller's side end 512.

[048] In the embodiment illustrated, dolly 510 is configured for sliding connection to mast 10. An adjustment pad 514 may be attached to each end 511 and 512 of dolly 510. A slide pad 516 is located on each adjustment pad 514. Slide pads 516 are configured for sliding engagement with mast 10 of drilling rig 1 or a rail set affixed to mast 10 for that purpose. Adjustment pads 514 permit precise centering and alignment of dolly 510 on mast 10. Similar slide assemblies or roller assemblies may be substituted for this purpose. Alternatively, a rack and gear arrangement may be provided.

[049] An arm bracket 520 extends outward from dolly 510 in the V-door direction. An arm 532 (or pair of arms 532) is pivotally and rotatably connected to extend below an arm bracket 520. Although the embodiments illustrated depict a pair of arms, they are connected in a manner to function as a single arm, and it will be understood that a single arm 532 could be depicted having an opening above clasp 550 for clearance of tubular stand 80. An actuator bracket 542 is connected to arm 532, or as between arms 532. In one embodiment, a tilt actuator 540 is pivotally connected between actuator bracket 542 and one of either dolly 510 or arm bracket 520.

[050] Pivot connection 534 is located on the lower end of each arm 532 (or on a bifurcated end of arm 532). Clasp 550 is pivotally connected to the pivot connections 534 at the lower end of each arm 532. In one embodiment, pivot connections 534 are located on the center of the lower end of arms 532 and clasp 550 is likewise pivotally connected at its center.

[051] In this embodiment, a centerline of tubular stand 80 is secured in clasp 550 and located between pivot connections 534 at the lower ends of each arm 532. In this configuration, clasp 550 is self-balancing to suspend tubular stand 80 or a tubular section (drill pipe or drill collar) 2 vertically, without additional inclination controls or adjustments. Clasp 550 can secure a tubular stand 80 at the upper end, e.g., at the box connection or other upset, so that the tubular stand is suspended from the clasp. Clasp 550 in one embodiment is slidable along the tubular stand 80 below the upset so that it can be moved down on the stand in the well center position to make room for the top drive to connect or disconnect the upper end of the tubular stand while maintaining the upper end of the tubular stand in the well center position.

[052] In another embodiment, the clasp 550 may comprise a gripper to grip the tubular stand at or below the upper end. For example, the clasp 550 may grip the tubular stand 80 below the upper end sufficiently to permit the top drive to connect or disconnect above, and this same gripping position may also be used to move the tubular stand in and out of well center.

[053] In the embodiment illustrated, a first pair of slide pads 516 is located on the driller's side end 51 1 of dolly 510, and a second pair of slide pads 516 is located on the off- driller's side end 512 of dolly 510.

[054] In one embodiment, a rotary actuator 522 is mounted to arm bracket 520 and has a drive shaft (not shown) extending through arm bracket 520. A drive plate 530 is rotatably connected to arm bracket 520, e.g., to the underside of the bracket, and connected to the drive shaft of rotary actuator 522. Rotary actuator 522 provides control of the rotational connection between dolly 510 and arm 532. [055] In this embodiment, tilt actuator 540 is pivotally connected between actuator bracket 542 and drive plate 530 to provide control of the pivotal relationship between dolly 510 and arm 532 below the dolly.

[056] FIG. 3 is a side view of the embodiment of tubular delivery arm 500 of FIG. 1 and FIG. 2, illustrating the lateral range of the motion of tubular delivery arm 500 to position a tubular stand 80 relative to positions of use on a drilling rig 1. Illustrated is the capability of tubular delivery arm 500 to retrieve and deliver a tubular stand 80 as between a well center 30, a mousehole 40, and a stand hand-off position 50, passing the clasp 550 and the suspended tubular stand below the dolly 510. Also illustrated is the capability of tubular delivery arm 500 to move to a catwalk position 60 and incline clasp 550 for the purpose of retrieving or delivering a tubular section 2 from a catwalk 600.

[057] FIG. 4 is a side view of the embodiment of tubular delivery arm 500 shown connected to drilling mast 10 of drilling rig 1 in catwalk position 60 (see FIG. 3) to receive a tubular section 2 from catwalk 600. For this purpose, it is advantageous to have inclination control of clasp 550, as disclosed in an embodiment shown in FIGS. 11 - 14.

[058] FIG. 5 is an isometric view of the embodiment of tubular delivery arm 500 of FIG. 4, receiving a tubular section 2 (drill pipe 2) from catwalk 600. As seen in this view, tubular delivery arm 500 is articulated outwards by tilt actuator 540 to permit clasp 550 to attach to tubular section 2. From this position, tubular delivery arm 500 can be used to deliver tubular section 2 to the well center for make-up with the drill string in the well by an iron roughneck 750 shown positioned by a drill floor manipulating arm 700. Alternatively, tubular delivery arm 500 can be used to build a stand with another drill pipe 2 secured in a mousehole 40 having a mousehole center (see FIGS.3 and 6).

[059] FIG. 6 is a side view of an embodiment of tubular delivery arm 500 connected to a drilling mast 10 in position to receive or deliver tubular stand 80 to mousehole 40.

[060] FIG. 7 is a side view of an embodiment of tubular delivery arm 500 connected to a drilling mast 10 and in position near the upper end to receive (or deliver) tubular stand 80 from stand hand-off position 50 at racking module 300.

[061] FIG. 8 is an isometric view of the embodiment of tubular delivery arm 500 of FIG. 7, illustrating tubular delivery arm 500 articulated to stand hand-off position 50 between racking module 300 and mast 10, and having tubular stand 80 secured in clasp 550.

[062] In one embodiment, slide pads 516 are slidably engageable with the front side (V- door side) 12 of drilling mast 10 to permit tubular delivery arm 500 to travel up and down front side 12 of mast 10, raising or lowering a tubular stand 80 secured at its upper end to the clasp 550. Rails may be attached to mast 10 for receiving slide pads 516. Tilt actuator 540 permits clasp 550 to swing over at least well center 30 and mousehole 40, to move the tubular stand 80, secured in the clasp 550, horizontally to pass below the dolly 510, e.g., by rotating the arm 532.

[063] FIG. 9 is a side view of an embodiment of tubular delivery arm 500 connected to drilling mast 10 and in position to deliver tubular stand 80 to or from mousehole 40.

[064] FIG. 10 is an isometric view of an embodiment of tubular delivery arm 500 connected to drilling mast 10 and in position to deliver tubular stand 80 to or from well center 30 to stab into (or be disconnected from) a stump secured at well center 30. After stabbing (or disconnection), tubular delivery arm 500 can hand tubular stand 80 off to top drive 200 (or move up the tubular stand 80 to secure it at the upset and hoist it away). Tubular delivery arm 500 is articulated by expansion of tilt actuator 540 (best seen in FIG. 13) which inclines arm 532 into position such that the centerline of tubular stand 80 in clasp 550 is properly over well center 30, and raised or lowered by translating the dolly 510 along the mast to position the clasp 550 at the desired elevation, e.g., by sliding the clasp along the tubular stand 80 secured in the clasp below the upper end, by releasing a grip on the tubular stand and articulating the arm to grip another position, etc.

[065] FIG 11 is an isometric exploded view of another embodiment of tubular delivery arm 500. Tubular delivery arm 500 comprises a dolly 510. Adjustment pads 514 (not shown) may be attached to ends 511, 512 of dolly 510. A slide pad 516 is located on each adjustment pad 514. Slide pads 516 are configured for sliding engagement with mast 10 of drilling rig 1 (see FIG. 15). Translatable engagement with mast 10 is intended to reference translatable engagement with rails affixed to mast 10 for that purpose as detailed further below. Adjustment pads 514 permit precise centering and alignment of dolly 510 on mast 10. Similar slide assemblies or roller assemblies may be substituted for this purpose.

[066] An arm bracket 520 extends from dolly 510 away from the mast 10. A drive plate 530 is rotatably connected to arm bracket 520, e.g., underneath it. One or more arms 532 are pivotally and rotationally connected to extend below arm bracket 520. An actuator bracket 542 is connected to arms 532. A rotary actuator 522 is mounted to arm bracket 520 for controlled rotation of the drive plate 530 and arms 532 relative to dolly 510.

[067] A tilt actuator 540 is pivotally connected between actuator bracket 542 and drive plate 530. Extension of tilt actuator 540 provides controlled pivoting of arms 532 below dolly 510. A tubular clasp 550 is pivotally connected to the pivot connections 534 at the lower end of arms 532.

[068] In this embodiment, one or more extendable incline actuators 552 are pivotally connected to arms 523 at pivot connections 554, and to opposing pivot connections 534 on clasp 550. Extension of the incline actuators 552 inclines clasp 550 and tilts any tubular stand 80 held in clasp 550. This embodiment permits tilting of heavy tubular stands 80, such as large collars.

[069] In another embodiment, a grease dispenser 560 is extendably connected to a lower end of arm 532 and extendable to position grease dispenser 560 at least partially inside of a box connection of tubular stand 80 secured by clasp 550. A grease supply line is connected between grease dispenser 560 and a grease reservoir 570 (see FIG. 12). In this position, grease dispenser 560 may be actuated to deliver grease, such as by pressurized delivery to the interior of the pin connection by either or both of spray nozzles or contact wipe application.

[070] In another embodiment illustrated in FIG. 12, a guide 564 is attached to arm 532 proximate to clasp 550. A grease dispenser 560 is connected to guide 564. An actuator 566 extends grease dispenser 560 to position it at least partially inside of a box connection of tubular stand 80 secured by clasp 550. In this position, grease dispenser 560 delivers grease to the interior of the pin connection by spray or contact application. A grease supply line (not shown) connects grease dispenser 560 to a grease reservoir 570 that may be mounted on dolly 510 or otherwise on transfer delivery arm 500. Alternatively, grease reservoir 570 may be located at the drill floor or other convenient location and the grease supplied along the grease supply line under pressure.

[071] The automatic greasing (doping) procedure improves safety by eliminating the manual application at the elevated position of tubular stand 80. The procedure adjusts to the height of the tubular stand 80 length automatically and is centered automatically by its connectivity to tubular delivery arm 500. The procedure may improve the efficiency of the distribution of the grease as well as cleanliness, thereby further improving safety by reducing splatter, spills, and over-application.

[072] FIG. 12 is a fully assembled isometric view of the embodiment of the tubular delivery arm 500 illustrated in FIG. 1 1 , illustrating arms 532 rotated and tilted to position clasp 550 over stand hand-off position 50 (see also FIG. 3). [073] FIG. 13 is an isometric view of the embodiment of tubular delivery arm 500 of FIGS. 11 and 12, illustrating arms 532 rotated and tilted to position clasp 550 over well center 30.

[074] FIG. 14 is a side view of the embodiment of tubular delivery arm 500 illustrated in FIGS. 11 - 13, illustrating the range of tubular delivery arm 500 to position a tubular stand 80 (not shown) with clasp 550.

[075] FIG. 15 is an isometric view of the embodiment of tubular delivery arm 500 of FIGS. 11 - 14, illustrating tubular delivery arm 500 articulated to stand hand-off position 50 between racking module 300 and mast 10, and having tubular stand 80 secured in clasp 550.

[076] FIG. 16 is an isometric view of the embodiment of tubular delivery arm 500 of FIG. 15, illustrating tubular delivery arm 500 articulated to well center 30 under mast 10, and having tubular stand 80 secured in clasp 550.

[077] FIG. 17 is an isometric view of the embodiment of the tubular delivery arm of FIG. 16, illustrating tubular delivery arm 500 connected to tubular stand 80 at stand hand-off position 50. Tubular stand 80 is shown secured in the stand hand-off position by clasp 408 of upper stand constraint 420 beneath racking module 300. In this position, tubular delivery arm 500 may activate grease dispenser 560 to apply an appropriate amount of grease inside the box end of tubular stand 80.

[078] FIG. 18 is an isometric view of the embodiment of tubular delivery arm 500 of FIG. 17, illustrating tubular delivery arm 500 hoisting tubular stand 80 released by upper stand constraint 420 away from stand hand-off position 50 adjacent to racking module 300.

[079] In this manner, tubular delivery arm 500 is delivering and centering tubular stands 80 for top drive 200. This design allows independent and simultaneous movement of tubular delivery arm 500 and top drive 200. This combined capability provides accelerated trip speeds. The limited capacity of tubular delivery arm 500 to lift tubular stands 80 of drill pipe drill collars allows the weight of tubular delivery arm 500 and mast 10 to be minimized. Tubular delivery arm 500 can be raised and lowered along the front 12 of mast 10 with an electronically controlled, hydraulic or electric variable frequency powered winch, e.g., a crown winch. Alternatively, tubular delivery arm 500 can be raised and lowered along mast 10 by means of a rack and pinion arrangement, with drive motors.

[080] In an embodiment, the top drive 200 and the tubular delivery arm 500 can be translated along the mast 10 independently, e.g., the top drive 200 and the tubular delivery arm 500 can be translated in opposite directions past one another, either above or below the other on the mast 10. For example, with the clasp 550 articulated away from the well center position 30, e.g., to deliver a stand 80 to the stand hand-off position 50 as seen in FIG. 15, the top drive 200 can operate along well center 30 to concurrently raise or lower the tubular stand 80 connected to the drill string. In another example, in an embodiment where the top drive 200 is retractable from the well center position 30, the top drive 200 can be raised or lowered in a retracted position while tubular delivery arm 500 operates with the clasp 550 in the well center 30 (see FIG. 10) to deliver, retrieve, and/or secure a tubular stand 80 in the well center position 30 for connection or disconnection from the drill string held in the rotary table.

[081] As a further example, by moving the tubular delivery arm 500 to position the clasp 550 below the box connection at the upper end of the stand 80, the tubular delivery arm 500 is moved to make room for access of the top drive 200 above the tubular stand 80 as seen in FIG. 10. In this embodiment, the tubular delivery arm 500 and the top drive 200 can both operate at well center 30 to hand off the tubular stand 80 as between them.

[082] For tripping in, the tubular delivery arm 500 engages the tubular stand 80 at the upper end to suspend it below the upset from the clasp 550 for transfer from the stand hand- off position 50, for example, into well center position 30 to stab into the drill string stump, and then the clasp 550 and the dolly 510 can slide or otherwise move down the tubular stand 80 and the mast 10, maintaining stabilization or the upper portion of the tubular stand 80 for the top drive 200 to connect to the box before disengaging the clasp 550 and returning the tubular delivery arm to the stand hand-off position 50 to retrieve another stand while the top drive 200 lowers the stand 80 and drill string into the well.

[083] For tripping out, after the top drive 200 raises the string and it is suspended with a stand 80 above the well, the tubular delivery arm 500 is articulated to engage the clasp 550 and the tubular stand 80 below the top drive 200 and box connection, as shown in FIG. 10. While the clasp 550 stabilizes the upper end of the stand 80 below the box connection, the top drive 200 is disconnected and moved away from the upper end of the stand 80. This can allow room for the tubular delivery arm 500 to raise the clasp 550 to engage the box connection and, after disconnection of the lower end of the stand 80 from the drill string, hoist the tubular stand 80 away and over to be set down in the stand hand-off position 50 for racking, or in another location. At the same time, the top drive 200 is moved into position to connect to the upper end of the drill string and hoist another stand for removal. If the top drive 200 is retractable, it can be translated down the mast 10 while the stand 80 is disconnected from the string and the tubular delivery arm 500 hoists it away. If the top drive 200 is not retractable it can be raised up on the mast 10 until the tubular delivery arm hoists the disconnected stand 80 away, and then lowered to connect to the next stand at the top of the drill string.

[084] If used herein, the term "substantially" is intended for construction as meaning "more so than not."

[085] Having thus described the various embodiments, it is noted that the embodiments disclosed are illustrative rather than limiting in nature and that a wide range of variations, modifications, changes, and substitutions are contemplated in the foregoing disclosure and, in some instances, some features may be employed without a corresponding use of the other features. Many such variations and modifications may be considered desirable by those skilled in the art based upon a review of the foregoing description of embodiments. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the disclosure.