In the course of completing an oil and/or gas well, a string of protective casing can be run into the wellbore followed by production tubing inside the casing. The casing can be perforated across one or more production zones to allow production fluids to enter the casing bore. During production of the formation fluid, formation sand may be swept into the flow path. The formation sand tends to be relatively fine sand that can erode production components in the flow path. In some completions, the wellbore is uncased, and an open face is established across the oil or gas bearing zone. Such open bore hole (uncased) arrangements are typically utilized, for example, in water wells, test wells, and horizontal well completions.
[0002] When formation sand is expected to be encountered, one or more sand screens can be installed in the flow path between the production tubing and the perforated casing (cased) and/or the open well bore face (uncased). A packer is customarily set above the sand screen to seal off the annulus in the zone where production fluids flow into the production tubing. The annulus around the screen can then be packed with a relatively coarse sand (or gravel) which acts as a filter to reduce the amount of fine formation sand reaching the screen. The packing sand is pumped down the work string in a slurry of water and/or gel and fills the annulus between the sand screen and the well casing. In well installations in which the screen is suspended in an uncased open bore, the sand or gravel pack may serve to support the surrounding unconsolidated formation.
[0003] During the sand packing process, annular sand "bridges" can form around the sand screen that may prevent the complete circumscribing of the screen structure with packing sand in the completed well. This incomplete screen structure coverage by the packing sand may leave an axial portion of the sand screen exposed to the fine formation sand, thereby undesirably lowering the overall filtering efficiency of the sand screen structure.
[0004] One conventional approach to overcoming this packing sand bridging problem has been to provide each generally tubular filter section with a series of shunt tubes that longitudinally extend through the filter section, with opposite ends of each shunt tube projecting outwardly beyond the active filter portion of the filter section. In the assembled sand screen structure, the shunt tube series are axially joined to one another to form a shunt path extending along the length of the sand screen structure. The shunt path operates to permit the inflowing packing sand/gel
slurry to bypass any sand bridges that may be formed and permit the slurry to enter the screen/casing annulus beneath a sand bridge, thereby forming the desired sand pack beneath it.

SUMMARY

[0005] In an embodiment, a shunt tube assembly comprises a shunt tube and a jumper tube comprising a first end. The shunt tube comprises a non-round cross section, and the first end of the jumper tube is coupled to the shunt tube at a coupling. The first end of the jumper tube comprises a substantially round cross section at the coupling.
[0006] In an embodiment, a shunt tube assembly comprises a shunt tube comprising a first cross-sectional shape, a jumper tube comprising a second cross-sectional shape, and a coupling member comprising a first end and a second end. The coupling member is configured to provide a sealing engagement between the coupling member and the shunt tube at the first end, and the coupling member is configured to provide a sealing engagement between the coupling member and the jumper tube at the second end.
[0007] In an embodiment, a shunt tube assembly comprises a plurality of shunt tubes, a jumper tube, and a coupling member configured to provide fluid communication between the jumper tube and the plurality of shunt tubes.
[0008] In an embodiment, a coupling member for use with a shunt tube assembly comprises a body member comprising a first side and a second side, a first opening disposed through the first side, and a second opening disposed through the second side. The body member is configured to be disposed about a wellbore tubular, the first opening is configured to engage a shunt tube, and the second opening is configured to engage a jumper tube. The first opening is in fluid communication with the second opening.
[0009] In an embodiment, a coupling member for use with a shunt tube assembly comprises a first body member, a second body member, and a chamber defined between the first body member and the second body member. The first body member is configured to be rotatably disposed about a wellbore tubular, and the first body member comprises a first opening configured to receive a jumper tube. The second body member is configured to be disposed about a wellbore tubular, and the second body member comprises one or more second openings configured to receive one or more shunt tubes. The first opening is in fluid communication with the one or more second openings through the chamber.
[0010] In an embodiment, a method of forming a shunt tube coupling comprises aligning a first end of a jumper tube with a shunt tube, where the shunt tube comprises a non-round cross section, and coupling the first end of the jumper tube to the shunt tube at a coupling, where the first end of the jumper tube comprises a substantially round cross section at the coupling.
[0011] In an embodiment, a method of gravel packing comprises passing a slurry through a first shunt tube, where the first shunt tube comprises a first cross-sectional shape, passing the slurry through a coupling, where the coupling comprises a coupling between the first shunt tube and a jumper tube, and where the jumper tube comprises a substantially round cross-section at the coupling, and disposing the slurry about a well screen assembly below the coupling.
[0012] In an embodiment, a method of forming a shunt tube coupling comprises rotating a first ring about a wellbore tubular, engaging a jumper tube with the first ring, rotating a second ring about the wellbore tubular, engaging one or more shunt tubes with the second ring, and forming a sealing engagement between the first ring and the second ring.
[0013] These and other features will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS
[0014] For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description:
[0015] Figure 1 is a cut-away view of an embodiment of a wellbore servicing system according to an embodiment.
[0016] Figure 2 is a cross-sectional view of an embodiment of a shunt tube assembly.

[0017] Figure 3 is a cross-sectional view of an embodiment of a shunt tube assembly along line
A-A' of Figure 2.
[0018] Figure 4 is a partial cross-sectional view of an embodiment of a shunt tube assembly.
[0019] Figure 5 is another partial cross-sectional view of an embodiment of a shunt tube assembly.
[0020] Figure 6A is still another partial cross-sectional view of an embodiment of a shunt tube assembly.
[0021] Figures 6B-6E are schematic cross-sectional views of an embodiment of a jumper tube.

[0022] Figure 7A is another partial cross-sectional view of an embodiment of a shunt tube assembly.

[0023] Figure 7B is a schematic isometric view of an embodiment of a coupling member.
[0024] Figure 8 is another partial cross-sectional view of an embodiment of a shunt tube assembly.
[0025] Figure 9 is yet another partial cross-sectional view of an embodiment of a shunt tube assembly.
[0026] Figure 10 is a partial cross-sectional view of an embodiment of a coupling member.
[0027] Figures 11A and 11B are schematic isometric views of an embodiment of a retaining ring.
[0028] Figure 11C is a partial cross-sectional view of an embodiment of a retaining ring.
[0029] Figures 12A-12D are isometric views of various embodiments of a retaining ring.
[0030] Figure 13 is a schematic cross-sectional view of an embodiment of a coupling member.
[0031] Figure 14 is another schematic cross-sectional view of an embodiment of a coupling member.
DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In the drawings and description that follow, like parts are typically marked throughout the specification and drawings with the same reference numerals, respectively. The drawing figures are not necessarily to scale. Certain features of the invention may be shown exaggerated in scale or in somewhat schematic form and some details of conventional elements may not be shown in the interest of clarity and conciseness.

[0033] Unless otherwise specified, any use of any form of the terms "connect," "engage," "couple," "attach," or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the elements and may also include indirect interaction between the elements described. In the following discussion and in the claims, the terms "including" and "comprising" are used in an open-ended fashion, and thus should be interpreted to mean "including, but not limited to ...". Reference to up or down will be made for purposes of description with "up," "upper," "upward," "upstream," or "above" meaning toward the surface of the wellbore and with "down," "lower," "downward," "downstream," or "below" meaning toward the terminal end of the well, regardless of the wellbore orientation. Reference to inner or outer will be made for purposes of description with "in," "inner," or "inward"

meaning towards the central longitudinal axis of the wellbore and/or wellbore tubular, and "out," "outer," or "outward" meaning towards the wellbore wall. As used herein, the term "longitudinal" or "longitudinally" refers to an axis substantially aligned with the central axis of the wellbore tubular, and "radial" or "radially" refer to a direction perpendicular to the longitudinal axis. The various characteristics mentioned above, as well as other features and characteristics described in more detail below, will be readily apparent to those skilled in the art with the aid of this disclosure upon reading the following detailed description of the embodiments, and by referring to the accompanying drawings.

[0034] Shunt tubes used in shunt tube systems generally have non-round cross-sectional shapes. These cross-sectional shapes allow for the shunt tubes to be arranged adjacent the wellbore tubular and provide a desired flow area without requiring an outer diameter that would otherwise be associated with the use of all round components. The jumper tubes used to couple shunt tubes on adjacent wellbore tubular joints are generally of the same non-round cross section as the shunt tubes to allow for a flow path having a continuous cross-sectional shape along the length of the shunt tube system. However, the use of couplings having non-round cross sections may lead to unreliable connections and the need to closely align the ends of the shunt tubes on adjacent joints of wellbore tubulars. Further, the use of couplings having non-round cross sections may result in a limit to the pressure rating of the coupling.

[0035] Rather than use couplings having non-round cross sections matching those of the shunt tubes, the system disclosed herein utilizes couplings having substantially round cross-sections. The use of couplings with substantially round cross-sections may allow for an improved seal at the couplings, thereby improving the pressure ratings of the couplings. These benefits may provide for more reliable couplings to be formed and improve the assembly time for forming the shunt tube system.

[0036] Referring to Figure 1, an example of a wellbore operating environment in which a well screen assembly may be used is shown. As depicted, the operating environment comprises a workover and/or drilling rig 106 that is positioned on the earth's surface 104 and extends over and around a wellbore 114 that penetrates a subterranean formation 102 for the purpose of recovering hydrocarbons. The wellbore 114 may be drilled into the subterranean formation 102 using any suitable drilling technique. The wellbore 114 extends substantially vertically away from the earth's surface 104 over a vertical wellbore portion 116, deviates from vertical relative to the earth's surface 104 over a deviated wellbore portion 136, and transitions to a horizontal wellbore portion 118. In alternative operating environments, all or portions of a wellbore may be vertical, deviated at any suitable angle, horizontal, and/or curved. The wellbore 114 may be a new wellbore, an existing wellbore, a straight wellbore, an extended reach wellbore, a sidetracked wellbore, a multi-lateral wellbore, and other types of wellbores for drilling and completing one or more production zones. Further, the wellbore may be used for both producing wells and injection wells. The wellbore 114 may also be used for purposes other than hydrocarbon production such as geothermal recovery and the like.

[0037] A wellbore tubular 120 may be lowered into the subterranean formation 102 for a variety of drilling, completion, workover, treatment, and/or production processes throughout the life of the wellbore. The embodiment shown in Figure 1 illustrates the wellbore tubular 120 in the form of a completion assembly string comprising a well screen assembly 122, which in turn comprises a shunt tube assembly, disposed in the wellbore 114. It should be understood that the wellbore tubular 120 is equally applicable to any type of wellbore tubulars being inserted into a wellbore including as non-limiting examples drill pipe, casing, liners, jointed tubing, and/or coiled tubing. Further, the wellbore tubular 120 may operate in any of the wellbore orientations (e.g., vertical, deviated, horizontal, and/or curved) and/or types described herein. In an embodiment, the wellbore may comprise wellbore casing 112, which may be cemented into place in at least a portion of the wellbore 114.

[0038] In an embodiment, the wellbore tubular 120 may comprise a completion assembly string comprising one or more downhole tools (e.g., zonal isolation devices 117, screen assemblies 122, valves, etc.). The one or more downhole tools may take various forms. For example, a zonal isolation device 117 may be used to isolate the various zones within a wellbore 114 and may include, but is not limited to, a packer (e.g., production packer, gravel pack packer, frac-pac packer, etc.). While Figure 1 illustrates a single screen assembly 122, the wellbore tubular 120 may comprise a plurality of screen assemblies 122. The zonal isolation devices 117 may be used between various ones of the screen assemblies 122, for example, to isolate different gravel pack zones or intervals along the wellbore 1 14 from each other.

[0039] The workover and/or drilling rig 106 may comprise a derrick 108 with a rig floor 110 through which the wellbore tubular 120 extends downward from the drilling rig 106 into the wellbore 114. The workover and/or drilling rig 106 may comprise a motor driven winch and

other associated equipment for conveying the wellbore tubular 120 into the wellbore 114 to position the wellbore tubular 120 at a selected depth. While the operating environment depicted in Figure 1 refers to a stationary workover and/or drilling rig 106 for conveying the wellbore tubular 120 within a land-based wellbore 114, in alternative embodiments, mobile workover rigs, wellbore servicing units (such as coiled tubing units), and the like may be used to convey the wellbore tubular 120 within the wellbore 114. It should be understood that a wellbore tubular 120 may alternatively be used in other operational environments, such as within an offshore wellbore operational environment.

[0040] In use, the screen assembly 122 can be positioned in the wellbore 114 as part of the wellbore tubular string adjacent a hydrocarbon bearing formation. An annulus 124 is formed between the screen assembly 122 and the wellbore 114. A gravel slurry 126 may travel through the annulus 124 between the well screen assembly 122 and the wellbore 114 wall as it is pumped down the wellbore 114 around the screen assembly 122. Upon encountering a section of the subterranean formation 102 including an area 128 of highly permeable material, the highly permeable area 128 can draw liquid from the slurry, thereby dehydrating the slurry. As the slurry dehydrates in the permeable area 128, the remaining solid particles form a sand bridge 130 and prevent further filling of the annulus 124 with gravel. One or more shunt tubes 132 may be used to create an alternative path for gravel around the sand bridge 130. The shunt tube 132 allows a slurry of sand to enter an apparatus and travel in the shunt tube 132 past the sand bridge 130 to reenter the annulus 124 downstream. The shunt tube 132 may be placed on the outside of the wellbore tubular 120 or run along the interior thereof.

[0041] The screen assembly 122 comprises one or more interconnected joints of threaded wellbore tubulars having shunt tube assemblies disposed about each joint of the wellbore tubulars. Adjacent sections may generally be substantially longitudinally aligned to allow the ends of adjacent shunt tubes on adjacent sections to be coupled with jumper tubes. The present disclosure teaches the use of various jumper tube and coupling mechanism configurations to improve the coupling between the various shunt tubes on adjacent sections. In an embodiment, the shunt tube and the jumper tube may comprise substantially round (e.g., circular) ends, thereby allowing for a coupling between the two components comprising a substantially round cross-section. In an embodiment, a coupling member may be used to couple to a shunt tube having an end with a non-round (e.g., non-circular) cross-section and a jumper tube having an end with a substantially round cross-section. The coupling member may be configured to provide fluid communication between a jumper tube and one or more shunt tubes, for example, a transport tube and a packing tube. In an embodiment, the jumper tube may comprise a non-uniform cross-sectional shape along its length. For example, one or more of the ends of the jumper tube may have a substantially round cross-section, and one or more portions between the ends of the jumper tube may have non-round cross-sections. Such an embodiment may be useful in reducing the outer diameter of the jumper tubes while maintaining the available flow area for fluid transport.

[0042] A cross-sectional view of an embodiment of an individual joint of wellbore tubular comprising a shunt tube assembly 200 disposed thereabout is shown in Figure 2. The wellbore tubular 120 generally comprises a series of perforations 202 disposed therethrough. A filter media 204 is disposed about the wellbore tubular 120 and the series of perforations 202 to screen the incoming fluids from the formation. The shunt tube assembly 200 comprises one or more retaining rings 212 and one or more shunt tubes 206 disposed along and generally parallel to the wellbore tubular 120. An outer body member 208 may be disposed about the wellbore tubular 120, one or more shunt tubes 206, and filter media 204. In an embodiment, the retaining rings 212 are configured to retain the one or more shunt tubes 206 and/or outer body member 208 in position relative to the wellbore tubular 120.

[0043] The wellbore tubular 120 comprises the series of perforations 202 through the wall thereof. The wellbore tubular 120 may comprise any of those types of wellbore tubular described above with respect to Figure 1. While the wellbore tubular 120 is illustrated as being perforated in Figure 2, the wellbore tubular 120 may be slotted and/or include perforations of any shape so long as the perforations permit fluid communication of production fluid between an interior throughbore 214 and an exterior 216 of the shunt tube assembly 200.

[0044] The wellbore tubular 120 may generally comprise a pin end 209 and a box end to allow the wellbore tubular 120 to be coupled to other wellbore tubulars having corresponding connections. As can be seen in Figure 2, the wellbore tubular 120 may have a coupling section that extends beyond the shunt tube assembly 200. The exposed portion 211 of the wellbore tubular 120 may be used during the coupling process to allow one or more tools to engage the exposed portion 211 and thread the joint to an adjacent joint of wellbore tubular. In an embodiment, the exposed portion may be about 1 to about 5 feet, or alternatively about 2 feet to about 4 feet, though any distance suitable for allowing the wellbore tubular 120 to be coupled to an adjacent joint of wellbore tubular may be used.

[0045] The filter media 204 may be disposed about the wellbore tubular 120 and can serve to limit and/or prevent the entry of sand, formation fines, and/or other particulate matter into the wellbore tubular 120. In an embodiment, the filter media 204 is of the type known as "wire-wrapped," since it is made up of a wire closely wrapped helically about a wellbore tubular 120, with a spacing between the wire wraps being chosen to allow fluid flow through the filter media 204 while keeping particulates that are greater than a selected size from passing between the wire wraps. While a particular type of filter media 204 is used in describing the present invention, it should be understood that the generic term "filter media" as used herein is intended to include and cover all types of similar structures which are commonly used in gravel pack well completions which permit the flow of fluids through the filter or screen while limiting and/or blocking the flow of particulates (e.g. other commercially-available screens, slotted or perforated liners or pipes; sintered-metal screens; sintered-sized, mesh screens; screened pipes; prepacked screens and/or liners; or combinations thereof).

[0046] The one or more shunt tubes 206 generally comprise tubular members disposed outside of and generally parallel to the wellbore tubular 120, though other positions and alignment may be possible. While described as tubular members (e.g., having substantially circular cross-sections), the one or more shunt tubes 206 may have shapes other than cylindrical and may generally be rectangular, elliptical, kidney shaped, and/or trapezoidal in cross-section. The retaining rings 212 may retain the shunt tubes 206 in position relative to the wellbore tubular 120. The one or more shunt tubes 206 may be eccentrically aligned with respect to the wellbore tubular 120 as best seen in Figure 3. In this embodiment, four shunt tubes 206, 302 are arranged to one side of the wellbore tubular 120 within the outer body member 208. While illustrated in Figures 2 and 3 as having an eccentric alignment, other alignments of the one or more shunt tubes about the wellbore tubular 120 may also be possible.

[0047] Various configurations for providing fluid communication between the interior of the one or more shunt tubes 206 and the exterior 216 of the outer body member 208 are possible. In an embodiment, the one or more shunt tubes 206 may comprise a series of perforations (e.g., openings and/or nozzles). Upon the formation of a sand bridge, a back pressure generated by the blockage may cause the slurry carrying the sand to be diverted through the one or more shunt

tubes 206 until bypassing the sand bridge. The slurry may then pass out of the one or more shunt tubes 206 through the perforations in both the shunt tubes 206 and outer body member 208 and into the annular space between the wellbore tubular and casing/wellbore wall to form a gravel pack.

[0048] In an embodiment, the shunt tubes 206 may comprise transport tubes and/or packing tubes 302. The one or more packing tubes 302 may be disposed in fluid communication with the one or more transport tubes. As illustrated in Figures 1 and 3, the packing tubes 302 may generally comprise tubular members disposed outside of and generally parallel to the wellbore tubular 120. The transport tubes and packing tubes 302 may be disposed generally parallel to the wellbore tubular 120 and may be retained in position relative to the wellbore tubular 120 by the retaining rings 212. A first end of the packing tubes 302 may be coupled to the one or more transport tubes at various points along the length of the transport tubes, and the packing tubes may comprise a series of perforations providing fluid communication within and/or through the outer body member 208 at a second end. As shown schematically in Figure 1, the shunt tubes may form a branched structure along the length of a screen assembly 122 with the one or more transport tubes forming the trunk line and the one or more packing tubes 302 forming the branch lines. In an embodiment, a plurality of branched structures may extend along the length of the screen assembly 122. The use of a plurality of branched structures may provide redundancy to the shunt tubes system in the event that one of the branched structures is damaged, clogged, or otherwise prevented from operating as intended.

[0049] In use, the branched configuration of the transport tubes and packing tubes 302 may provide the fluid pathway for a slurry to be diverted around a sand bridge. Upon the formation of a sand bridge, a back pressure generated by the blockage may cause the slurry carrying the sand to be diverted through the one or more transport tubes 206 until bypassing the sand bridge. The slurry may then pass out of the one or more transport tubes 206 into the one or more packing tubes 302. While flowing through the one or more packing tubes 302, the slurry may pass through the perforations in the packing tubes 302 and into the annular space about the wellbore tubular 120 to form a gravel pack.

[0050] To protect the shunt tubes 206 and/or filter media 204 from damage during installation of the screen assembly comprising the shunt tube assembly 200 within the wellbore, the outer body member 208 may be positioned about a portion of the shunt tube assembly 200.

The outer body member 208 comprises a generally cylindrical member formed from a suitable material (e.g. steel) that can be secured at one or more points, for example to the retaining rings 212, which in turn, are secured to wellbore tubular 120. The outer body member 208 may have a plurality of openings 218 (only one of which is numbered in Figure 2) through the wall thereof to provide an exit for fluid (e.g., gravel slurry) to pass through the outer body member 208 as it flows out of one or more openings in the shunt tubes 206 (e.g., through openings in the packing tubes 302), and/or an entrance for fluids into the outer body member 208 and through the permeable section of the filter media 204 during production. By positioning the outer body member 208 over the shunt tube assembly 200, the shunt tubes 206 and/or filter media 204 may be protected from any accidental impacts during the assembly and installation of the screen assembly in the wellbore that might otherwise damage or destroy one or more components of the screen assembly or the shunt tube assembly 200.

[0051] As illustrated in Figures 2 and 3, the shunt tubes 206, outer body member 208, and/or in some embodiments, the filter media 204 can be retained in position relative to the wellbore tubular 120 using the retaining rings 212. The retaining rings 212 generally comprise rings and/or clamps configured to engage and be disposed about the wellbore tubular 120. The retaining ring 212 may engage the wellbore tubular using any suitable coupling including, but not limited to, corresponding surface features, adhesives, curable components, spot welds, any other suitable retaining mechanisms, and any combination thereof. For example, the inner surface of the retaining ring 212 may comprise corrugations, castellations, scallops, and/or other surface features, which in an embodiment, may be aligned generally parallel to the longitudinal axis of the wellbore tubular 120. The corresponding outer surface of the wellbore tubular 120 may comprise corresponding surface features that, when engaged, couples the retaining rings 212 to the wellbore tubular 120.

[0052] Figure 3 illustrates a cross-sectional view along line A-A' of Figure 2 that shows the cross-section of a retaining ring 212. In the embodiment shown in Figure 3, the retaining ring extends around the wellbore tubular 120. A plurality of through passages are provided in the retaining ring 212 to allow the one or more shunt tubes 206, 302 to pass through a portion of the retaining ring 212. The retaining ring 212 may also be configured to engage and retain the outer body member 208 in position about the wellbore tubular 120. The retaining ring 212 may also

be used to couple the shunt tubes 206, 302 to the jumper tubes, as described in more detail herein.

[0053] While the joints of wellbore tubular described herein are generally described as comprising a series of perforations 202 and filter media 204, one or more joints of wellbore tubular 120 may only have the shunt tube assemblies disposed thereabout. Such a configuration may be used between joints of wellbore tubular 120 comprising production sections to act as spacers or blank sections while still allowing for a continuous fluid path through the shunt tubes 206 along the length of the interval being completed.

[0054] In an embodiment, an assembled sand screen structure can be made up of several joints of the wellbore tubular comprising the shunt tube assemblies 200 described herein. During the formation of the assembled sand screen structure, the shunt tubes 206 on the respective joints are fluidly connected to each other as the joints are coupled together to provide a continuous flowpath for the gravel slurry along the entire length of assembled sand screen structure during gravel packing operations.

[0055] In order to couple joints of wellbore tubulars, adjacent joints comprising screens may be connected by threading together adjacent joints using a threaded coupling (e.g., using timed threads) to substantially align the shunt tubes on the adjacent joints. As illustrated in Figure 4, the end of each shunt tube on the adjacent joints may then be individually coupled using a connector such as a jumper tube. A jumper tube may comprise a relatively short length of tubing which may be engaged to one or more shunt tubes on adjacent joints of wellbore tubulars to provide fluid communication along the length of the shunt tube system. The jumper tubes may comprise one or more tubular components that may be fixed in length or configured to provide a telescoping and extending tubular for engaging one or more shunt tubes. The various components of the jumper tube and jumper tubes connections may be configured to reduce and/or minimize the transitional flow affects through the connections, thus reducing and/or minimizing the associated pressure drops across the various components.

[0056] Typically, the jumper tube may be assembled onto the aligned shunt tubes after the adjacent joints of wellbore tubular are coupled together. In general, jumper tubes may comprise the same or similar shape to the shunt tubes to which they are coupled. However, the use of couplings with non-round cross-sectional shapes may result in a number of difficulties in forming a reliable seal. For example, the alignment of a shunt tube with a non-round cross-

section and a jumper tube with a corresponding non-round cross-section may need to be more precise than the alignment of the same or similar coupling with both parts having round cross-sectional shapes. In order to address this type of issue, the connection between a shunt tube and a jumper tube may comprise a coupling with a substantially round cross-section. The use of a coupling with a substantially round cross-section may allow for more reliable seals and/or seal back-ups to be used, potentially increasing the pressure rating of the resulting coupling.

[0057] Various configurations may be used to form a coupling between a shunt tube and a jumper tube comprising a round cross-section. In an embodiment, an end of the shunt tube and jumper tube may have substantially round cross-sections, allowing the shunt tube and jumper tube to form a coupling with a substantially round cross-section. In an embodiment, a coupling member, which may be separate from the shunt tube and jumper tube, may be used to coupling the shunt tube to the jumper tube. The coupling member may comprise a first end and a second end. The coupling member may be configured to provide a sealing engagement between an end of the shunt tube, which may have a non-round cross-section, and an end of the jumper tube, which may have a round cross-section. In this embodiment, the coupling member may be configured to adapt the non-round cross-section of the shunt tube to a round cross-sectional shape for engaging the jumper tube. In an embodiment, a coupling member may be configured to engage the jumper tube with a round cross-section and a plurality of shunt tubes, which may comprise non-round cross-sections. In this embodiment, the coupling member may serve to distribute flow to a plurality of shunt tubes such as a transport tube and a packing tube. In some embodiments, the coupling member may be the retaining ring 212, where the retaining ring is configured to provide the functions of the coupling member. In an embodiment, the coupling member may comprise a plurality of body portions that are rotatable about the wellbore tubular. This may allow each portion to be rotated and engaged with the jumper tube and/or the shunt tube(s). This may allow for a longitudinal misalignment of the shunt tubes on adjacent sections of wellbore tubular. Each of these configurations will be discussed below in more detail.

[0058] In an embodiment illustrated in Figure 5, the shunt tube 506 may transition from a non-round cross-section to a substantially round cross-section at the coupling 503 with the jumper tube 501. As described herein, the shunt tube 506 may generally comprise a tubular member aligned along the longitudinal axis of the wellbore tubular 120. The shunt tube 506 may have a non-round cross-section along the length of the wellbore tubular joint 120. In an

embodiment, a first end 502 of the shunt tube 506 may comprise a substantially round cross-section. The cross-section of the shunt tube 506 may transition from a non-round shape to a substantially round shape over a portion 505 of the shunt tube 506. Various processes may be used to form a shunt tube 506 comprising a non-round cross-section that transitions or otherwise changes to a round cross-section at the first end 502. For example, the shunt tube 506 may be rolled, cast, or otherwise formed into a tubular member comprising the different cross-sectional shapes along its length.

[0059] In an embodiment, a second shunt tube 526 may transition from a non-round cross-section to a substantially round cross-section at a second coupling 523 between the jumper tube 501 and the second shunt tube 526. The second shunt tube 526 may have a non-round cross-section along the length of a second wellbore tubular joint 520. In an embodiment, a first end 522 of the second shunt tube 526 may comprise a substantially round cross-section. The cross-section of the second shunt tube 526 may transition from a non-round shape to a substantially round shape over a portion 525 of the second shunt tube 526. Various processes may be used to form the second shunt tube 526 comprising a non-round cross-section that transitions or otherwise changes to a round cross-section at the first end 522. For example, the shunt tube 526 may be rolled, cast, or otherwise formed into a tubular member comprising the different cross-sectional shapes along its length. While it is understood that one or both ends 512, 532 of the jumper tube 501 and the corresponding ends 502, 522 of the shunt tubes 506, 526, respectively, may be formed as described herein, reference in the following discussion will be made to the first coupling 503 alone in the interest of clarity.

[0060] As noted above, the use of a round cross-section may provide for a more reliable coupling between the jumper tube 501 and a shunt tube 506. The coupling 503 between the jumper tube 501 and shunt tube 506 may also provide for a similar flow cross-sectional area as compared to the flow cross-sectional area through the shunt tube 506 upstream of the first end 502. In an embodiment, the flow cross-sectional area at the coupling between the jumper tube 501 and the shunt tube 506 may be within about 10%, within about 20%, within about 30%, within about 40%, or within about 50% of the flow cross-sectional area through the shunt tube 506 upstream of the first end 502. Due to the differing cross-sectional shapes between the shunt tubes 506 upstream of the end 502 and at the coupling between the jumper tube 501 and the shunt tube 506, the concept of a similar flow capacity may be expressed in terms of a hydraulic diameter. In an embodiment, the hydraulic diameter of the shunt tubes 506 upstream of the end 502 may be within about 10%, within about 20%, within about 30%, within about 40%, or within about 50% of the hydraulic diameter of the coupling between the jumper tube 501 and the shunt tube 506.

[0061] As can be seen in Figure 5, the coupling 503 formed by the engagement of the jumper tube 501 with the end 502 of the shunt tube 506 may comprise the jumper tube 501 engaged within the substantially round bore of the end 502 of the shunt tube 506. One or more seals 514 (e.g., o-ring) may be disposed between the outer diameter of the jumper tube 501 and the inner diameter of the shunt tube 506 to form a sealing engagement between the jumper tube 501 and the shunt tube 506 at the coupling 503. In an embodiment, the one or more seals 514 may comprise seal back-ups for providing a higher pressure rating for the coupling 503 than if seal back-ups were not used. The one or more seals 514 may be disposed in corresponding recesses disposed on the outer diameter of the jumper tube 501 and/or in the inner diameter of the shunt tube 506. In order to aid in forming the coupling 503, the end 502 of the shunt tube 506 and/or the end 512 of the jumper tube 501 may be beveled, angled, rounded, or otherwise formed to provide a non-squared shoulder at the end of the shunt tube 506 and/or the jumper tube 501.

[0062] While Figure 5 illustrates the end 512 of the jumper tube 501 sealingly engaged and disposed within the end 502 of the shunt tube 506, the end 512 of the jumper tube 501 may be configured to receive the end 502 of the shunt tube 506 within its bore. In this configuration, the one or more seals 514 may be disposed between the inner diameter of the jumper tube 501 and the outer diameter of the shunt tube 506 within the coupling 503. In an embodiment in which both ends of the jumper tube 501 comprise substantially round cross-sections, the engagement configuration of the jumper tube 501 and the shunt tubes 506, 526 may be the same at each end 512, 532 of the jumper tube 501. For example, the ends 512, 532 of the jumper tube 501 may be disposed within the ends 502, 522 of the shunt tubes 506, 526, respectively, or the ends 502, 522 of the shunt tubes 506, 526 may be disposed within the ends 512, 532 of the jumper tube 501. In an embodiment, the engagement configuration of the jumper tube 501 and the shunt tubes 506, 526 may be different at each end 512, 532 of the jumper tube 501. For example, the end 512 of the jumper tube 501 may be disposed within the end 502 of the shunt tube 506, and the end 522 of the shunt tube 526 may be disposed within the end 532 of the jumper tube 501, or vice-versa. In some embodiments, a coupling between the jumper tube 501 and a shunt tube 506, 526 may

be formed by abutting the end 502 of the shunt tube 506 to the end 512 of the jumper tube 501. The ends 502, 512 may be held in engagement using any suitable connection methods. For example, each component may be coupled with a connection mechanism (e.g., bolts, screws, adhesives, welds, corresponding threads, or the like).

[0063] In an embodiment as illustrated in Figure 5, the portions 505, 525 of the shunt tubes 506, 526 over which the shunt tubes 506, 526 transitions from a non-round cross-section to a substantially round cross-section may be configured to allow for a jumper tube 501 having a substantially fixed longitudinal length to be used to couple to both shunt tubes 506, 526. In this embodiment, the jumper tube 501 may be configured to be engaged with a shunt tube 526 over a sufficient distance so that the opposite end 512 of the jumper tube 501 can be aligned and engaged with the shunt tube 506. The longitudinal length 556 of the jumper tube 501 may allow both ends 512, 532 of the jumper tube 501 to engage (e.g., sealingly engage) the shunt tubes 506, 526, respectively, on adjacent joints of wellbore tubular.

[0064] As illustrated in Figure 5, the longitudinal length of the jumper tube 501 and the portions of the shunt tubes 506, 526 configured to engage the jumper tube 501 may be configured to allow the jumper tube 501 to engage both shunt tubes 506, 526. In an embodiment, the shunt tube 526 may have a substantially round cross-section configured to receive and/or be disposed within the jumper tube 501 over the distance 550, and the shunt tube 506 may have a substantially round cross-section configured to receive and/or be disposed within the jumper tube 501 over at least a distance 554. A distance 552 may exist between the ends 502, 522 of the shunt tubes 506, 526 on adjacent joints of wellbore tubulars 120, 520. In an embodiment, a jumper tube having a substantially fixed length may be used when the overall length 556 of the jumper tube 501 is less than the sum of the distance 552 between the ends 502, 522 of the shunt tubes 506, 526 and the distance 550. This may allow the jumper tube 501 to be inserted into the shunt tube 526 a distance 550, and then be aligned with the shunt tube 506. The jumper tube 501 may then be engaged with the shunt tube 506 a distance 554, which may be less than the distance 550 to provide for an engagement between the jumper tube 501 and the shunt tubes 506, 526.

[0065] Once engaged with the shunt tubes 506, 526, the jumper tube 501 may be held in place using a retaining mechanism 570 configured to engage the jumper tube 501 and/or one or more of the shunt tubes 506, 526 to maintain the jumper tube 501 in engagement with the shunt tubes 506, 526. In an embodiment, the retaining mechanism may comprise a snap ring configured to engage the jumper tube 501 adjacent to one or both of the shunt tubes 506, 526, thereby preventing movement of the jumper tube 501 into the shunt tubes 506, 526. In some embodiments, the retaining mechanism may engage one or more of the shunt tubes 506, 526 to prevent movement of one or more of the shunt tubes 506, 526 into the jumper tube 501 (e.g., when the jumper tube 501 is configured to receive one or more of the shunt tubes 506, 526 within its bore). In some embodiments, the retaining mechanism 570 may comprise an indicator on the jumper tube 501 or the shunt tube 506, 526 with a corresponding snap fitting assembly (e.g., a snap ring, a collet lug, etc.) on the engaging surface. In some embodiments, the engagement between the jumper tube 501 and one or more of the shunt tubes 506, 526 may comprise a friction fit, compression fit, and/or the like that may be sufficient to maintain the engagement without the need for a retaining mechanism. In some embodiments, the engagement between the jumper tube 501 and one or more of the shunt tubes 506, 526 may comprise a threaded connection. For example, the engagement between the jumper tube 501 and the shunt tube 526 may comprise a sliding, sealing engagement, and the engagement with the shunt tube 506 may then be maintained using a threaded connection, thereby maintaining the engagement with the shunt tube 526 in position through the fixed engagement at the threaded interface on the shunt tube 506.

[0066] In an embodiment as illustrated in Figure 6A, one or more portions of the jumper tube 601 may comprise a non-round cross-section. One or more protrusions 562, 564 may be disposed about the wellbore tubulars 120, 520, respectively, at the ends of the wellbore tubulars 120, 520 to provide for various mechanical properties and/or handling procedures during the coupling of the adjacent wellbore tubulars 120, 520. For example, the protrusions 562, 564 may provide engagement locations for the tongs used during the coupling process of the wellbore tubular joints 120, 520 at the surface of the well. These protrusions 562, 564 may have increased outer diameters relative to the outer diameter of the wellbore tubulars 120, 520. In some embodiments, the protrusions 562, 564 may have outer diameters that would interfere with the jumper tube 501 if the jumper tube 501 comprised a straight tubular component having a substantially round cross-section along its length. The jumper tube 501 may be sized to avoid the protrusions 562, 564, for example by reducing the diameter of the jumper tube 501, but the flow area through the jumper tube 501 may also be reduced.

[0067] In order to avoid the protrusions and/or provide additional flow area through the jumper tube 501, one or more portions of the jumper tube 501 may be configured to comprise a non-round cross-section. As shown in Figure 6A, a portion 604 of the jumper tube 601 may have a non-round cross-section. The portion 604 of the jumper tube 601 having a non-round cross-section may be disposed adjacent to the protrusions 562, 564 forming the coupling between the wellbore tubulars 120, 520. This may allow the jumper tube to extend past the protrusions while maintaining a suitable flow area through the jumper tube 501. The non-round cross-section may comprise any suitable shape. Figures 6B-6E illustrate various suitable cross-sectional shapes including, but not limited to, rectangular, oval, kidney shaped (e.g., arced and/or oblong), trapezoidal, squared, and/or any other suitable non-round cross-sectional shape. In some embodiments, the jumper tube 601 may comprise a bend between the first end 612 and the second end 622 to allow the jumper tube 601 to be routed past the protrusions 562, 564 at the coupling between the wellbore tubular joints 120, 520. The bend may allow the jumper tube 601 to be disposed adjacent to the wellbore tubular 120, extend out to be disposed adjacent to the outer diameter of the protrusions 562, 564, and then be disposed adjacent to the wellbore tubular 520. This embodiment may limit the length of the portion 604 of the jumper tube 601 having an increased outer diameter.

[0068] The portion 604 of the jumper tube 601 having a non-round cross-section may have the same or similar cross-sectional area available for flow as compared to the flow cross-sectional area through the shunt tube 506 upstream of the first end 502 and/or the end 612 of the jumper tube 601. In an embodiment, the flow cross-sectional area of the portion 604 comprising the non-round cross-section may be within about 10%, within about 20%, within about 30%, within about 40%, or within about 50% of the flow cross-sectional area through the shunt tube 506 upstream of the first end 502 and/or the end 612 of the jumper tube 601. Due to the differing cross-sectional shapes between the shunt tubes 506 upstream of the end 502, the end 612 of the jumper tube 601, and/or the portion 604 comprising the non-round cross-section, the concept of a similar flow capacity may be expressed in terms of a hydraulic diameter. In an embodiment, the hydraulic diameter of the portion 604 comprising the non-round cross-section may be within about 10%, within about 20%, within about 30%, within about 40%, or within about 50% of the hydraulic diameter through the shunt tube 506 upstream of the first end 502 and/or the end 612 of the jumper tube 601.

[0069] Referring to Figures 4 and 5, the coupling process between the adjacent wellbore tubular joints 120, 520 may begin with coupling a first joint of wellbore tubular 120 comprising a shunt tube assembly to a second joint of wellbore tubular 520 comprising a shunt tube assembly. The wellbore tubular sections 120, 520 may generally comprise a pin and box type connection that can be threaded together and torqued according to standard connection techniques. Once coupled, the end 502 of a first shunt tube 506 on the first wellbore tubular joint 120 may be substantially aligned with the adjacent end 522 of a second shunt tube 526 on the second wellbore tubular joint 520. In an embodiment, the shunt tubes 506, 526 may be considered substantially aligned if they are aligned to within about 10 degrees, about 7 degrees, or about 5 degrees of each other.
[0070] Once the adjacent shunt tubes 506, 526 are substantially aligned, the jumper tube 501 may be used to provide a fluid coupling between the adjacent shunt tubes 506, 526. In an embodiment, the jumper tube 501 may be coupled to the adjacent ends of the adjacent shunt tubes 506, 526. For example, the jumper tube 501 may be engaged with one of the shunt tubes 506. The opposite end of the jumper tube 501 may then be extended (e.g., extended through a telescoping configuration) to engage the shunt tube 526 on the adjacent joint of wellbore tubular 520. In some embodiments, a jumper tube 501 having a fixed length may be used. In this embodiment, the jumper tube 501 may be engaged with the shunt tube 506 and displaced relative to the shunt tube 506 a sufficient distance to allow the opposite end of the jumper tube 501 to be aligned and engaged with the shunt tube 526. The jumper tube 501 may then be engaged with the shunt tube 526 a distance sufficient to form an engagement while maintaining the engagement with the first shunt tube 506. One or more seals (e.g., o-ring seals 514, etc.) may be used to provide a fluid tight connection between the jumper tube 501 and the end of the respective shunt tube 506, 526. In some embodiments, one or more retaining mechanisms may be used to maintain the engagement of the jumper tube 501 with the shunt tubes 506, 526.
[0071] Similar jumper tubes 501 may be used to couple any additional shunt tubes (e.g., transport tubes, packing tubes, etc.) being fluidly coupled between the adjacent joints of wellbore tubulars 120, 520. Having fluidly coupled the shunt tubes 506, 526 and any additional tubes on the adjacent joints of wellbore tubulars 120, 520, an additional shroud 403 may be used to protect the jumper tubes 501. In an embodiment, the shroud may be similar to the outer body member 208, and may be configured to be disposed about the jumper tube section 540 to prevent damage to the jumper tubes 501 and ends of the adjacent shunt tubes 506, 526 during conveyance within the wellbore. Once the adjacent wellbore tubulars 120, 520 are coupled and the shroud 403 has been engaged, additional joints of wellbore tubulars may be similarly coupled to the existing joints and/or additional wellbore tubulars may be used to complete the assembled sand screen structure for use in the wellbore.

WE claimed

1. A shunt tube assembly comprising:
a plurality of shunt tubes;
a jumper tube; and
a coupling member configured to provide fluid communication between the jumper tube and the plurality of shunt tubes.
2. The shunt tube assembly of claim 1, wherein the coupling member comprises a first end and a second end, wherein the coupling member is configured to provide a sealing engagement between the coupling member and the jumper tube at the first end, and wherein the coupling member is configured to provide a sealing engagement between the coupling member and the plurality of jumper tubes at the second end.
3. The shunt tube assembly of claim 1, wherein the coupling member comprises at least one chamber, wherein the chamber is in fluid communication with the jumper tube and the plurality of shunt tubes.
4. The shunt tube assembly of claim 1, wherein the plurality of shunt tubes comprises a transport tube.
5. The shunt tube assembly of claim 4, wherein the plurality of shunt tubes comprises a packing tube.
6. The shunt tube assembly of claim 1, further comprising a second shunt tube coupled to the jumper tube, wherein the second shunt tube is in fluid communication with the plurality of shunt tubes through the jumper tube and the coupling member.
7. The shunt tube assembly of claim 1, wherein the plurality of shunt tubes comprises a first cross-sectional shape, and wherein the jumper tubes comprise a second cross-sectional shape.
8. The shunt tube assembly of claim 7, wherein the coupling member is further configured to sealingly engage the first cross-sectional shape and the second cross-sectional shape.
9. The shunt tube assembly of claim 1, wherein the coupling member comprises an
alignment ring.
10. A coupling member for use with a shunt tube assembly comprising:
a body member comprising a first side and a second side, wherein the body member is
configured to be disposed about a wellbore tubular;
a first opening disposed through the first side, wherein the first opening is configured to engage a shunt tube; and
a second opening disposed through the second side, wherein the second opening is
configured to engage a jumper tube, wherein the first opening is in fluid communication with the second opening.
11. The coupling member of claim 10, further comprising a chamber disposed within the body member, wherein the chamber is in fluid communication with the first opening and the second opening.
12. The coupling member of claim 11, further comprising a third opening disposed through the first side, wherein the third opening is configured to engage a second shunt tube.
13. The coupling member of claim 12, wherein the third opening is in fluid communication with the chamber.
14. The coupling member of claim 12, further comprising a divider disposed within the chamber, wherein the divider is configured to separate the chamber into a first portion and a second portion, and wherein the first portion is in fluid communication with the first opening and the second opening, and wherein the second portion is in fluid communication with the third opening.
15. The coupling member of claim 10, wherein the body member is further configured to retain the shunt tube in position relative to the wellbore tubular.
16. A coupling member for use with a shunt tube assembly comprising:
a first body member, wherein the first body member is configured to be rotatably
disposed about a wellbore tubular, and wherein the first body member comprises a first opening configured to receive a jumper tube;
a second body member, wherein the second body member is configured to be disposed about a wellbore tubular, and wherein the second body member comprises one or more second openings configured to receive one or more shunt tubes; and a chamber defined between the first body member and the second body member, wherein the first opening is in fluid communication with the one or more second openings through the chamber.
17. The coupling member of claim 16, wherein the second body member is configured to be rotatably disposed about the wellbore tubular.
18. The coupling member of claim 16, further comprising a cover sealingly engaged with the first body member and the second body member, wherein the chamber is further defined by the cover.
19. The coupling member of claim 16, wherein the first body member sealingly engages the second body member.
20. The coupling member of claim 16, wherein the one or more shunt tubes comprise a
transport tube and a packing tube.
21. The coupling member of claim 16, wherein the first opening is axially misaligned relative to the one or more second openings.
22. The coupling member of claim 16, wherein the first body member is configured to be axially translatable about the wellbore tubular.
23. A method of forming a shunt tube coupling comprising:
rotating a first ring about a wellbore tubular;
engaging a jumper tube with the first ring;
rotating a second ring about the wellbore tubular;
engaging one or more shunt tubes with the second ring; and
forming a sealing engagement between the first ring and the second ring.
24. The method of claim 23, wherein forming the sealing engagement comprises forming a chamber between the first ring and the second ring.
25. The method of claim 23, wherein forming the sealing engagement comprises: engaging a cover with the first ring and the second ring.
26. The method of claim 23, wherein the jumper tube and the one or more shunt tubes are radially misaligned.