• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SYSTEM FOR ACCESSING A HOLE FROM A SUBMARINE WELL AND WELL HEAD SYSTEM. The present invention relates to systems for accessing a well hole including a BOP of eruptions with a universal intervention interface. In some embodiments, the system includes an eruption BOP and a valve assembly (115). The eruption BOP has a hollow hole and is installable over a well so that the hollow hole is in fluid communication with the well hole. The valve assembly is coupled to the flare BOP and includes a fluid flow path (180) in fluid communication with the flush BOP hole, two valves connected in series and arranged along the fluid flow path ( 180), the valves operable to control the flow through the fluid flow path (180), and an ROV panel (150) that includes ports accessible by an ROV for operation of the two valves.
    公开号:BR112013014320B1
    申请号:R112013014320-7
    申请日:2011-12-07
    公开日:2020-12-08
    发明作者:Johnnie E. Kotrla；Ross Stevenson
    申请人:Cameron Technologies Limited；
    IPC主号:
    专利说明:

    Background
    The present invention relates to a rash preventer (BOP). More specifically, the description refers to a rash preventer with an interface that, when the rash preventer is installed on a wellhead, allows access to the wellbore.
    As is well known, an eruption preventer (BOP) is installed over a wellhead to seal and control an oil and gas well during drilling operations. A drill string can be suspended within a drill rig riser through the eruption preventer into the well bore. A plug line and a damping line are also suspended from the probe and attached to the eruption preventer.
    During drilling operations, a drilling fluid, or mud, is supplied through the drilling column, and is returned through an annular space between the drilling column and the liner that lines the well hole. In the case of a rapid influx of formation fluid into the annular space, commonly known as a "bounce", the eruption preventer is used to seal the annular space. The bounce can be circulated upwards to the probe processing equipment. Alternatively, a heavier drilling mud can be supplied through the drill string, forcing fluid from the annular space through the shutter line or the damping line to protect wellhead equipment disposed above the eruption preventer from the high pressures associated with the forming fluid. Assuming that the structural integrity of the well has not been compromised, drilling operations can begin again. However, if drilling operations cannot be resumed, cement or heavier drilling mud is supplied into the well hole to cushion the well.
    If the eruption preventer failed to act in response to a surge of pressure from forming fluid within the annular space, an eruption could occur. The rash can result in loss of life for those on board the probe, damage to the equipment of the can and / or the probe, and damage to the environment. In such circumstances, devices and methods that allow quick access to the borehole are desirable. Description Summary
    Systems for accessing a borehole including a eruption preventer with a universal intervention interface are described. In some embodiments, the system includes a rash preventer and a valve assembly. The eruption preventer has a hollow hole and is installable over a well so that the hollow hole is in fluid communication with the well hole. The valve assembly is coupled to the eruption preventer and includes a fluid flow path in fluid communication with the eruption prevented hole, two valves connected in series and arranged along the fluid flow path, the operable valves to control the flow through the fluid flow path, and an ROV panel that includes ports accessible by an ROV for operation of the two valves.
    The system may further include a closure assembly disposed at the second end of the fluid flow path, the closing assembly preventing fluid flow from the fluid flow path and being removable to allow fluid flow to and from the path fluid flow. The closing assembly may include a blind hub and an ROV-operated retainer. The valve assembly may also include a tubular spool with the hub to which the closure assembly is removably attached. The cube can have a profile that conforms to API standards. The valve assembly can be coupled to the eruption preventer on a port in fluid communication with the leaked eruption preventer hole, the fluid flow path of the valve assembly in fluid communication with the port. The valve assembly can be coupled to a flow line so that the flow line is in fluid communication with the eruption prevented hole through the valve assembly fluid flow path. The flow line can be one of a group consisting of a shutter line and a damping line.
    In some embodiments, the system includes an eruption preventer installed over a well bore, the eruption preventer having a hollow hole in fluid communication with the well bore; a damping line coupled to the eruption preventer in fluid communication with the well bore; a plug line attached to the eruption preventer in fluid communication with the well bore; and a valve assembly attached to the eruption preventer. The valve assembly has a first hollow hole in fluid communication with the hollow hole in order to prevent eruptions; an actuated valve arranged along the first hollow hole, the valve operable to control the flow of fluid through the first hollow hole; a spool that has a cube; and a removable closure assembly connected to the hub, the closure assembly preventing fluid flow through it.
    The valve assembly can be connected to the mortar-cement line and also include a second hollow hole in fluid communication with the damping line and the first hollow hole. The valve assembly may be connected to the plug line and also include a second hollow hole in fluid communication with the plug line and the first hollow hole. The valve can be a gate valve. The valve assembly may further include an ROV panel that has an accessible closing door for an ROV to close the valve and an accessible opening door for the ROV to open the valve.
    In some embodiments, the system includes a wellhead assembly that has a hollow hole and installable over the subsea well, where the wellhead assembly hole is in fluid communication with the wellhead; an eruption preventer coupled to the wellhead assembly and having a hole drilled in fluid communication 30 with the wellhead assembly hole; and a valve assembly attached to the eruption preventer. The valve assembly includes a fluid flow path in fluid communication with the hollow hole to prevent eruptions; two valves connected in series and arranged along the fluid flow path, the valves operable to control the flow through the fluid flow path; and an ROV panel that includes ports accessible by an ROV for operation of the two valves.
    The system may further include a closure assembly disposed at the second end of the fluid flow path, the closing assembly preventing fluid flow from the fluid flow path and being removable to allow fluid flow to or of the fluid flow path. The valve assembly may further include a hub to which the closing assembly 10 is removably coupled. The cube can have a profile that conforms to API standards. The valve assembly can be coupled to the eruption preventer on a port in fluid communication with the leaked eruption preventer hole, the fluid flow path of the valve assembly in fluid communication with the port. The valve assembly can be coupled to a flow line so that the flow line is in fluid communication with the hollow blow preventer hole through the fluid flow path of the valve assembly. The flow line can be one of a group consisting of a shutter line and a damping line.
    Thus, the modalities described herein comprise a combination of aspects and features designed to address various disadvantages associated with conventional BOP sets and associated methods. The various features described above, as well as other aspects, will be readily apparent to those skilled in the art 25 when reading the following detailed description of the preferred embodiments, and referring to the accompanying drawings. Brief Description of Drawings
    For a detailed description of the modalities presented, reference will now be made to the accompanying drawings in which:
    Figure 1 is a perspective view of a rash preventer according to the principles described here;
    Figures 2A through 2C are perspective, lateral, and lateral views in cross-section, respectively, of an embodiment of a double cavity valve assembly shown in Figure 1;
    Figures 3A and 3B are seen in perspective and side in cross-section, respectively, of another modality of a set of double cavity valves shown in Figure 1;
    Figures 4A and 4B are perspective and lateral views in cross section, respectively, of yet another modality of a double cavity valve assembly;
    Figures 5A and 5B are side and side views in cross section, 10 respectively, of the eruption preventer of Figure 1, which illustrate the coupling of the double cavity valves in the hollow hole of the eruption preventer and the plug or damping line;
    Figure 6 is an enlarged perspective view of a hydraulic connector and an underwater flow line coupled to the eruption preventer; and
    Figure 7 is a cross-sectional side view of the eruption preventer, the hydraulic connection, and the underwater flow line in Figure 6. Detailed Description of the Modalities Described
    The following description is intended for exemplary modalities of a 20 rash preventer and associated methods of use. The described modalities should not be interpreted, or otherwise used, as limiting the scope of the description, including the claims. Someone skilled in the art will understand that the following description has broad application, and that the discussion is only intended to be an example of the modality described, and is not intended to suggest that the scope of the description, including the claims, is limited to that modality.
    Certain terms are used throughout the following description and claims to refer to specific characteristics or components. As someone skilled in the art will appreciate, different people may refer to the same feature or component by different names. This document is not intended to distinguish between components or features that differ in name, but not in function. Furthermore, the drawing figures are not necessarily to scale. Certain features and components described here may be shown exaggerated in scale or in a somewhat schematic form, and some details of conventional elements may not be shown in the interests of clarity and conciseness.
    In the following description and in the claims, the terms "including" and "comprising" are used in an open manner, and thus should be interpreted to mean "including, but not limited to Also, the term" coupling "or" couplings "are intended to mean or a direct or indirect connection. So, if a first device is coupled to a second device, this connection can be through a direct connection, or through an indirect connection through other devices and connections. Also, the terms " axial "and" axially "generally mean along or parallel to a central or longitudinal geometric axis. The terms" radial "and" radially "generally mean perpendicular to the central or longitudinal geometric axis, while the terms" circumferential " and "circumferentially" generally mean arranged around the circumference, and as such, perpendicular to either the central or longitudinal axis and a radial geometric axis normal to the axis central or longitudinal geometric. As used herein, these terms are consistent with their meanings commonly understood with respect to a cylindrical coordinate system.
    Referring now to Figure 1, a set of rash preventers 100 is shown according to the principles described here. The rash preventer set 100 includes an assembly of a plurality of 25 individual BOPs that form a rash preventer 105 and one or more double cavity valve sets 115 coupled to the rash preventer 105. The rash preventer 105 is supported on a frame 110 and has an upper end 120 and a lower end 125. The upper end 120 of the eruption preventer 105 allows the coupling of a lower marine riser assembly (not shown) to it. The lower end 125 of the rash preventer 105 allows the connection of the rash preventer 105 to a wellhead (also not shown). When eruption preventer 105 is installed over a wellhead, double cavity valve assemblies 115 allow connection of intervention equipment, such as, but not limited to, conduits, drifters, collectors, shutters, and 5 injection, in the eruption preventer 105 and a fluid communication between the well bore and the intervention equipment. As such, each of the double cavity valve sets 115 is also referred to here as an intervention set 115. There are two modalities of an intervention set 115 shown in Figure 1. Each modality is described below with reference to the Figures 2A through 3B.
    The lower intervention set 115 of Figure 1 is shown in Figures 2A through 2C, and identified in these figures as a set 130. t
    As shown, intervention set 130 includes two actuating valves 135, a spool 140, a BOP connector 145, a remotely operated vehicle panel (ROV) 150, and a housing 155. Valves 135 are connected in series for redundancy between spool 140 and BOP connector 145. In some embodiments, each valve 135 is a gate valve, but could be another type of valve in the industry. Housing 155 is connected to, or integrally formed with, valve 135 near spool 140.
    Each of the valves 135, the spool 140, the BOP connector 145, and the housing 155 has a longitudinal flow bore 160, 165, 170, 175 respectively, best seen in Figure 2C. Flow holes 160, 165, 170, 175 align to form a first fluid flow path 180 through assembly 130. Housing 155 further includes a transverse flow hole 185 that intersects and, in this embodiment, extends substantially perpendicular to the longitudinal flow hole 175. The cross flow hole 180 and the longitudinal flow hole 175 are in fluid communication with each other.
    The ROV panel 150 has a closing door 190 and an opening door 195. Doors 190, 195 are accessible to an ROV, and when accessed by the ROV, operable to close and open valves 135 as needed. When closing door 190 is accessed, valves 135 fe-cham, and fluid is prevented from flowing between flow holes 170, 175 of BOP connector 145 and housing 155. When opening door 195 is ceased, valves 135 open, and fluid flow is enabled through flow hole 160 of valves 135 between flow holes 170, 175.
    The BOP 145 connector allows the coupling of the assembly 130 to the eruption preventer 105. The BOP 145 connector includes an end connector 200 at its end furthest from the valves 135. The end connector 200 can be a flange, a hub, or other type of connector, as needed, to couple with a similar connector on the eruption preventer 105. In the illustrated embodiment, end connector 200 is a flange. When the end connector 200 is connected to the eruption preventer 105, a fluid communication is established between the assembly 130 and the eruption preventer 105 flow hole, and thus the well hole.
    Housing 155 includes two opposite connectors 205 disposed near the ends of the cross flow hole 185. Connectors 205 prevent fluid loss from housing 155 through cross flow hole 185. Also, each connector 205 is removable to allow coupling of the set 130 to a shutter line or a deadening line. When so connected, fluid communication is established between the assembly 130 and the plug or damping line, and thus the well bore. In the illustrated embodiment, connectors 205 are blind flanges. However, in other embodiments, connectors 205 may be hubs or other types of connectors that prevent fluid loss from housing 155 when coupled to it and are removable to allow coupling of housing 155 to a plug line or line damping.
    The spool 140 has two opposite ends. At one end, the spool 140 has an end connector 210 that connects to housing 155 and, in some embodiments, supports the ROV panel 150. End connector 210 can be a flange, hub, or other type of connector that allows the connection of the spool 140 in the housing 155. In the • illustrated embodiment, the end connector 210 is a flange. At the opposite end, the spool 140 has a hub 215. In preferred embodiments, hub 215 has a profile that conforms to the standards defined by the American Petroleum Institute (API) and allows the coupling of intervention equipment to it when necessary. In such modalities, the hub 215 provides a universal interface that allows the coupling of various types of intervention equipment in the set 130. When the intervention equipment is not necessary, the set 130 still includes a set of 10 closing 220 (Figures 5A, 5B) that prevents fluid loss from assembly 130 through flow hole 165 and spool 140. In some embodiments, closure assembly 220 includes a blind hub 222 and a retainer <225. Retainer 225 is removable by an ROV to allow the coupling of the intervention equipment to hub 215 of spool 140.
    The upper intervention set 115 of Figure 1 is shown in Figures 3A and 3B, and identified in these figures as a set 230. Intervention set 230 is substantially identical to intervention set 130, previously described, but for the replacement of the connector upper 205 by extension 235. Extension 235 has two opposite ends and a flow hole 240 extending between them. Extension 235 is connected to housing 155 at one end, and includes a connector 245 at the other end. Flow hole 240 is in fluid communication with transverse flow hole 185. Connector 245 allows coupling of assembly 230 to a plug or damping line, and 25 can be a flange, as illustrated, a hub, or another type of connector known in the industry. When so connected, fluid communication is established between the assembly 230 and the plug or damping line.
    Someone skilled in the art will readily appreciate that the extension 30 is 235 can instead replace the lower connector 205, as illustrated by Figures 4A and 4B. In any case, extension 235 allows the intervention set 230 to be coupled to the end of a plug or damping line. Furthermore, both connectors 205 can be replaced by two extensions 235. This allows the positioning of the intervention assembly 115 along a plug line or damping line, rather than at the end of one.
    Referring now to Figures 5A and 5B, each intervention set 115 is coupled to the eruption preventer 105. More specifically, the flange 200 of each set 115 is coupled to a port 250 on the eruption preventer 105 which is in fluid communication with the hollow hole of the eruption preventer 105, and consequently the well hole.
    For the modalities of the upper intervention set 115 having an extension 235, like the upper intervention set 115 in these figures, the extension 235 is coupled by means of its flange 245 to a line <of plug or a damping line 270. During use, the eruption preventer 105 is installed on a wellhead 300 15 (Figure 7), and provides a seal and control of the well hole 305 (Figure 7) below. When a bounce occurs, the rash preventer 105 can be actuated to close and prevent the upward flow of pressurized fluid through the bore of the rash preventer 105. If the rash preventer 105 fails to fully contain the bounce, a leak or rash 20 may occur.
    In the event of a leak or eruption, the system that controls the eruption preventer 105 can be damaged and rendered partially or totally inoperable. In such cases, an ROV is positioned on the eruption preventer 105, and maneuvered to remove the closing set 220 25 from at least one intervention set 115, connect the intervention equipment to the hub 215 now exposed from set 115, and open the valves 135 of set 115 to access the well bore. For example, as illustrated in Figure 6, the ROV can remove retainer 225 and blind hub 222 from lower intervention assembly 115 and connect a hydraulic connector 255 and an underwater flow line 260 to hub 210 of spool 135 The ROV can then open the valves 135 of the set 115 through the ROV panel 150. When the valves 135 are open, a fluid flow path 265 is established between the underwater flow line 260 and the well bore 305, as best seen in Figure 7. Flow path 265 allows injection of cement, heavy drilling mud, or any other fluid through subsea flow line 260 and into well bore 305 5 to control the well or dampen the well, if so desired. Alternatively, flow path 265 allows for the diversion of high pressure forming fluid from the flow hole of the eruption preventer 105 through the underwater flow line 260 to a remote location for processing, storage, or disposal as needed.
    Although several modalities have been shown and described, their modifications can be made by someone versed in the technique without agitating the spirit and the teachings here. The modalities here are exemplary only, and are not limiting. Many variations and modifications of the apparatus described herein are possible and within the scope of the invention. Accordingly, the scope of protection is not limited by the above description, but is only limited by the claims which follow, this scope including all equivalents of the subject of the claims.
    权利要求:
    Claims (20)
    [0001]
    1. System to access a hole in an underwater well that uses different types of intervention equipment, the system is characterized by comprising: a BOP stack (105) that includes a hole that can be drilled and installed over the well so that the hollow hole is in fluid communication with the well hole; and a valve assembly (115) coupled to the BOP stack (105), wherein the valve assembly (115) includes: a fluid flow path (180) in fluid communication with the hollow hole in the BOP stack ( 105); two valves connected in series and arranged along the fluid flow path (180), the valves operable to control the flow through the fluid flow path (180); a tubular spool (140) connected to the two opposite valves of the BOP stack (105), so as to be in fluid communication with the fluid flow path (180), in which the tubular spool (140) it comprises a universal intervention interface that comprises a hub suitable for connection by different types of intervention equipment; and an ROV panel (150) that includes ports accessible by an ROV for operation of the two valves.
    [0002]
    2. System according to claim 1, characterized by the fact that it still comprises a closing assembly disposed in the cu-bo, the closing assembly preventing the flow of fluid from the fluid flow path (180) and being removable to allow the fluid flow to and from the fluid flow path (180).
    [0003]
    3. System according to claim 2, characterized by the fact that the closing assembly comprises a blind hub and a re-tentor operable by ROV.
    [0004]
    4. System according to claim 1, characterized by the fact that the hub has a profile in accordance with API standards.
    [0005]
    5. System according to claim 1, characterized by the fact that the valve assembly (115) is coupled to the BOP stack (105) over a port in fluid communication with the hollow hole in the BOP stack (105), the fluid flow path (180) of the valve assembly (115) in fluid communication with the port.
    [0006]
    6. System according to claim 1, characterized by the fact that the valve assembly (115) can be coupled to a flow line so that the flow line is in fluid communication with the leaked hole in the BOP stack (105) through the fluid flow path (180) of the valve assembly (115).
    [0007]
    7. System according to claim 6, characterized by the fact that the flow line is one of a group consisting of a choke line and a kill line.
    [0008]
    8. System according to claim 1, characterized by the fact that the valve assembly still includes: a cross flow hole that includes open ends outside the valve assembly (115), in which the hole cross-flow flow intersects the fluid flow path (180) to provide fluid communication without a valve with the fluid flow path (180) which in addition to through the tubular spool (140); and removable connectors to close the transverse flow hole ends.
    [0009]
    9. Wellhead system for use with different types of intervention equipment, characterized by comprising: a BOP stack (105) installed in a well hole, the BOP stack (105) equipped with a hole drilled in communication fluid with the well bore; a killing line coupled to the BOP stack (105) in fluid communication with the well bore; a choke line coupled to the BOP stack (105) in fluid communication with the well bore; and a valve assembly (115) coupled to the BOP stack (105), wherein the valve assembly (115) includes: a first hole drilled in fluid communication with the hole drilled from the BOP stack (105); an actuable valve arranged along the first hollow hole, the valve operable to control the flow of fluid through the first hole drilled; a spool attached to the actuating valve opposite the BOP stack (105), in order to be in fluid communication with the first hollow hole, in which the spool comprises a universal intervention interface that includes a hub suitable for connection by the different types of intervention equipment; a second hollow hole and including an open end outside the valve assembly (115), wherein the second hollow hole is in fluid communication with the first hollow hole in addition to through the spool; and a removable closure assembly connected to the hub, the closure assembly preventing fluid flow through it.
    [0010]
    10. Wellhead system according to claim 9, characterized by the fact that the kill line is in fluid communication with the first hole drilled through the second hole drilled.
    [0011]
    11. Wellhead system according to claim 9, characterized by the fact that the throttling line is in fluid communication with the first bore through the second bore.
    [0012]
    12. Wellhead system according to claim 9, characterized by the fact that the valve is a gate valve.
    [0013]
    13. Wellhead system according to claim 9, characterized by the fact that the valve assembly (115) further comprises an ROV panel (150) that has a closing door accessible to an ROV to close the valve and an opening door accessible to the ROV to open the valve.
    [0014]
    14. System for accessing a borehole in an underwater well using at least one of the different types of intervention equipment, characterized by comprising: a wellhead assembly with a hollow hole and installable in the subsea well, in which what hole drilled from the wellhead assembly is in fluid communication with the well hole; a pile of BOP (105) coupled to the wellhead assembly and having a hole drilled in fluid communication with the hole drilled from the wellhead assembly; and a valve assembly (115) coupled to the BOP stack (105), the valve assembly including: a fluid flow path (180) in fluid communication with the hollow hole in the BOP stack (105); two valves connected in series and arranged along the fluid flow path (180), the valves operable to control the flow through the fluid flow path (180); a tubular coil attached to the two opposite valves of the BOP stack (105), so as to be in fluid communication with the fluid flow path (180), the tubular spool (140) comprising a universal intervention interface comprising a hub suitable for connection by different types of intervention equipment; and an ROV panel (150) that includes ports accessible by an ROV for operation of the two valves.
    [0015]
    System according to claim 14, characterized in that it also comprises a closing assembly arranged in the hub, the closing assembly prevents the flow of fluid from the fluid flow path (180) and is removable to allow the flow of fluid to or from the fluid flow path (180).
    [0016]
    16. System according to claim 14, characterized by the fact that the hub comprises a profile that complies with API standards.
    [0017]
    17. System according to claim 14, characterized by the fact that the valve assembly is coupled to the BOP stack (105) through a fluid communication port with the hollow hole in the BOP stack (105), the path fluid flow (180) from the valve assembly (115) in fluid communication with the port.
    [0018]
    18. System according to claim 14, characterized by the fact that the valve assembly is connectable to a flow line in such a way that the flow line is in fluid communication with the leaked hole in the BOP stack (105 ) through the fluid flow path (180) of the valve assembly (115).
    [0019]
    19. System according to claim 18, characterized in that the flow line is one of a group consisting of a choke line and a kill line.
    [0020]
    A system according to claim 14, characterized in that the valve assembly (115) further comprises: a transverse bore hole that includes open ends to the outside of the valve assembly (115), wherein the transverse bore hole salt intersects the fluid flow path (180) to provide fluid communication without a valve with the fluid flow path (180) in addition to through the tubular spool (140); and removable connectors to close the ends of the transverse hole.
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    同族专利:
    公开号 | 公开日
    GB2500843A|2013-10-02|
    BR112013014320A2|2016-09-27|
    US9115563B2|2015-08-25|
    WO2012078780A3|2012-08-30|
    GB201312080D0|2013-08-21|
    NO20130815A1|2013-06-24|
    US8746345B2|2014-06-10|
    US20140231088A1|2014-08-21|
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    SG190981A1|2013-07-31|
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    法律状态:
    2018-10-23| B25A| Requested transfer of rights approved|Owner name: CAMERON TECHNOLOGIES LIMITED (NL) |
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-09-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-08-04| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-08| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/12/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    2021-10-05| B21F| Lapse acc. art. 78, item iv - on non-payment of the annual fees in time|Free format text: REFERENTE A 10A ANUIDADE. |
    2022-01-25| B24J| Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)|Free format text: EM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2648 DE 05-10-2021 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/964,418|2010-12-09|
    US12/964,418|US8746345B2|2010-12-09|2010-12-09|BOP stack with a universal intervention interface|
    PCT/US2011/063780|WO2012078780A2|2010-12-09|2011-12-07|Bop stack with a universal intervention interface|
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