• 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:
    SAFETY VALVE FOR USE IN AN UNDERGROUND WELL. A safety valve can include multiple magnetic devices reciprocally arranged in respective chambers extending longitudinally, and another magnetic device magnetically coupled to the first magnetic devices. The first magnetic devices can be circumferentially spaced apart and surrounded by the second magnetic device. Another safety valve may include multiple chambers extending longitudinally and multiple magnetic devices. Each of the magnetic devices can be reciprocally arranged in a respective chamber, and the magnetic devices can be attached to an operational member of the safety valve.
    公开号:BR112014005508B1
    申请号:R112014005508-4
    申请日:2012-08-23
    公开日:2021-03-16
    发明作者:Junior James D. Vick
    申请人:Halliburton Energy Services, Inc；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [0001] This description refers generally to equipment used in operations carried out in conjunction with an underground well and, in an example described below, more particularly it provides a magnetically coupled safety valve with satellite magnets. BACKGROUND OF THE INVENTION
    [0002] The operation of a safety valve employing magnetic coupling, through a pressure isolating barrier, has been described in U.S. Patent No. 6,988,556. The entire description of this earlier patent is incorporated here by this reference.
    [0003] Space is always limited in wells and higher pressure grades are continually needed. Therefore, we note that improvements are continually needed in the technique of magnetically coupled safety valves. SUMMARY OF THE INVENTION
    [0004] In the description below, a safety valve is provided that brings improvements to the technique. An example is described below, in which the unvkrnqu fkurqukvkxqu ocipfivkequ “ucVfinkVgu”, fízcfqu c wo ogodtq operational of the safety valve, are positioned between a flow passage and an external magnetic device. Another example is described below, where the satellite magnetic devices move within a pressure support wall of the safety valve.
    [0005] In one aspect, a safety valve for use in an underground well is provided in the art. In an example described below, the safety valve can include multiple magnetic devices reciprocally arranged in respective chambers extending longitudinally, and another magnetic device magnetically coupled to the first magnetic devices. The first magnetic devices are circumferentially spaced apart and are surrounded by the second magnetic device.
    [0006] In another aspect, a safety valve is described which, in one example, may include multiple chambers extending longitudinally and multiple magnetic devices. Each of the magnetic devices is reciprocally arranged in a respective chamber, and the magnetic devices are fixed to an operational member of the safety valve.
    [0007] These and other details, advantages and benefits will become evident to a person of ordinary skill in the art under careful consideration of the detailed description of the representative examples below and the accompanying drawings, in which similar elements are indicated in the various figures using the same reference numbers are used. BRIEF DESCRIPTION OF THE DRAWINGS
    [0008] Fig. 1 is a representative view partially in cross section of a well system that can incorporate the principles of this description.
    [0009] Fig. 2 is a cross-sectional view representative on an enlarged scale of a part of a safety valve that can incorporate principles of this description.
    [00010] Fig. 3 is a cross-sectional view representative of the safety valve, taken along line 3 - 3 of Fig. 2.
    [00011] Fig. 4 is a cross-sectional view representative of a part of the safety valve actuator.
    [00012] Fig. 5 is a side view representative on an enlarged scale of a satellite magnetic device of the safety valve.
    [00013] Fig. 6 is a cross-sectional view representative of another configuration of the safety valve.
    [00014] Figs. 7 - 9 are quarterly sectional views representative of additional arrangements of the magnetic devices within the safety valve.
    [00015] Figs. 10A-G are seen in cross-section representative of another safety valve configuration. DETAILED DESCRIPTION OF THE INVENTION
    [00016] A well system 10, which can incorporate the principles of this description, is shown in Fig. 1. A safety valve 12 is interconnected in a tubular column 14 as part of a production unit 16 positioned in a well 20. A line 18 is used to control the operation of the safety valve 12 from a remote location, such as the surface of the land, an underwater installation, etc.
    [00017] Line 18 can be a hydraulic, electrical, optical line or other type or combination of line (s). Alternatively, the operation of the safety valve 12 can be controlled from the remote location using telemetry, such as electromagnetic, acoustic, pressure pulse or other type of telemetry, in which case line 18 cannot be used.
    [00018] The safety valve 12 is used to selectively allow and prevent fluid flow through a flow passage 22 (not visible in Fig. 1, see Fig. 2) of the tubular column 14, which extends through the flow valve safety. Specifically, in emergency situations, the safety valve 12 is used to close the passage 22 and thereby prevent uncontrolled flow of hydrocarbons to the surface, via the tubular column 14.
    [00019] However, it must be clearly understood that the well 10 system, as represented in Fig. 1 and described here, is only one of the many applications for the principles of this description. A wide variety of different well systems and other applications can incorporate the principles of this description and, therefore, it will be appreciated that this description is not limited to any aspect of the details of the well system 10.
    [00020] With reference now to Fig. 2, a schematic cross-sectional view on an enlarged scale of a longitudinal part of the safety valve 12 is shown illustrated. In this view it can be seen that the safety valve 12 includes a closing unit 24, which is operated by moving an operational member 26 to selectively allow and prevent flow through the passage 22.
    [00021] The closing unit 24 in this embodiment includes a flapper 28, which rotates around a pivot 30 in relation to a sealing surface 32, formed in a seat 34. As shown in Fig. 2, the operational member 26 is in its upward displaced position and flap 28 sealingly engages the sealing surface 32 to prevent flow through passage 22.
    [00022] However, when the operating member 26 is moved downwards, the operating member will contact the flapper 28 and rotate the flapper down close to pivot 30, thereby allowing flow through passage 22. As described more fully below, a Magnetic coupling is used to move the operating member 26 between its up and down displaced positions, to thereby selectively prevent and allow flow through the passage 22.
    [00023] Operational member 26 is of the type known to those skilled in the art as a flow tube or opening pin. Operational member 26 may include details in addition to those shown in Fig. 2, such as a spring driven extension etc. In addition, other types of operational members can be used, without deviating from the principles of this description.
    [00024] Other types of closure units can also be used in place of closure unit 24. For example, a type of ball valve closure unit could be used in place of flapper type closure unit 24. Thus, it should be clearly understood that the principles of this description are not limited in any way to the details of the safety valve 12 described here.
    [00025] The operating member 26 and the closing unit 24 are contained within a generally tubular housing 36. Although the housing 36 is schematically represented in Fig. 2 as a single component of the safety valve 12, we note that the housing could on the contrary, it is composed of multiple interconnected components, in order to form a housing unit.
    [00026] Housing 36 includes a pressure support wall 38. In this embodiment, wall 38 is exposed to pressure inside well 20 external to housing 36, when used in well system 10, and the wall is exposed to pressure in passage 22. Thus, wall 38 is a pressure isolation barrier, which resists any pressure differential between passage 22 and well 20, external to the safety valve 12.
    [00027] Multiple chambers circumferentially spaced apart and longitudinally extending 40 are formed within the wall 38. A magnetic device 42 is reciprocally disposed within each of the chambers 40. The magnetic devices 42 are represented illustrated in Fig. 2 as including multiple magnets permanently shaped discs stacked 44, but other types of magnetic devices can be used, if desired.
    [00028] Magnetic devices 42 are magnetically coupled to another magnetic device 46 attached to operational member 26. Magnetic device 46 is shown in Fig. 2 as including multiple stacked annular shaped permanent magnets. 48, but other types of magnetic devices can be used, if desired.
    [00029] A resulting magnetic coupling force between the magnetic devices 42, 46 causes the magnetic devices to move together, that is, the displacement of the magnetic device 46 is fixed for the displacement of the magnetic devices 42. As described more fully below, a safety valve actuator 12 is used to move the magnetic devices 42 and thereby move the magnetic device 46 and the fixed operating member 26 to operate the safety valve.
    [00030] A cross-sectional view in somewhat enlarged scale 12 is represented illustrated in Fig. 3. In this view, the way in which chambers 40 and magnetic devices 42 are circumferentially spaced apart within the wall of housing 38 can be clearly seen View. The housing wall 38 is preferably made of a non-magnetic material, so that it does not interfere with the magnetic coupling between the magnetic devices 42, 46.
    [00031] Note that the housing wall 38 is more structurally rigid and better able to withstand the pressure differential between the passage 2 and the well 20 external to the safety valve 12, when compared to the use of separate walls to separately resist to these pressure differentials. This is due, in part, to the wall 38 being radially thicker in those parts of the wall that completely surrounds the chambers 40 and magnetic devices 42.
    [00032] Due to this increased structural integrity of the wall 38, the magnetic devices 42 can be positioned relatively close to the magnetic device 46, thereby increasing the magnetic coupling force between the magnetic devices 42, 46. Although twenty-four of the magnetic devices 42 are represented in Fig. 3, greater or lesser numbers of magnetic devices can be used to keep up with the principles of this description.
    [00033] With reference now to Fig. 4, another cross-sectional view of the safety valve 12 is shown, showing an actuator 50 of the safety valve. It should be clearly understood, however, that the actuator 50 is described here as just an example of the many different types of actuators that can be used, while maintaining the principles of this description. For example, several types of electric, hydraulic, optical and other actuators can be used instead of the 50 actuator.
    [00034] The actuator 50 includes an annular piston 52 fixed to each of the magnetic devices 42. The piston 52 is shown in Fig. 4 as being fixed to the magnetic devices 42 using the actuating members 54 in the form of rods interconnected between the piston and magnetic devices, but other fixation methods can be used, if desired.
    [00035] Instead of an annular piston 52, one or more of the individual cylindrical pistons could be arranged in the respective holes and the piston (s) could be connected to a ring in which all the members 54 are also fixed. Thus, several different arrangements of pistons, limbs, etc. can be used on actuator 50 and thus the actuator is not limited to any of the details shown in the drawings and / or described here at all.
    [00036] Pressure is applied to move piston 52 through an orifice 56. For example, line 18 shown in Fig. 1 could be connected to orifice 56.
    [00037] A pressure differential across piston 52 can be applied to move the piston up or down to produce a corresponding simultaneous displacement of the magnetic devices 42. This displacement of the magnetic devices 42 causes a corresponding displacement of the magnetic device 46 and operational member 26 to operate the safety valve 12.
    [00038] To create a pressure differential through piston 52, a lower side of the piston can be in fluid communication with flow passage 22, with well 20 outside the safety valve, with another line, with a pressure chamber inside safety valve etc. Thus, we have observed that many different ways of constructing the actuator 50 can be used in keeping with the principles of this description.
    [00039] Referring in addition now to Fig. 5, an enlarged side view of one of the magnetic devices 42 is represented in addition to the rest of the safety valve 12. In this way, it can be seen that the magnetic device 42 can include rollers 58 or any other type of friction reducing device, in order to reduce the force required to move the magnetic devices within the cameras 40.
    [00040] With reference now to Fig. 6, a schematic cross-sectional view of an alternative configuration of the safety valve 12 is shown illustrated. This cross-sectional view is very similar to that illustrated in Fig. 3, except that the housing 36 has been modified in the embodiment of Fig. 6.
    [00041] The housing wall 38 of the embodiment of Fig. 6 includes an inner wall 38a and an outer wall 38b. This configuration makes the manufacture of housing 36 more convenient, since cameras 40 can be formed by milling the longitudinal recesses outside the inner wall 38a (for example, using a ball end mill etc.) and then radially outwardly closing the recesses with the outer wall 38b. The inner and outer walls 38a, 38b can be joined together above and below chambers 40 by various methods, such as threading, welding etc.
    [00042] The internal and external walls 38a, 38b still resist the pressure differential between the passage 22 and the outside of the safety valve 12. The internal and external walls 38a, 38b can support each other when resisting this pressure differential, due to the structural supports 60 between the chambers 40, which fit between the inner and outer walls.
    [00043] The supports 60 are shown in Fig. 6 as being integrally formed with the inner wall 38a, however the supports could also or alternatively be formed as part of the outer wall 36b (for example, the chambers 40 could be partially formed on the internal wall and, partially, the external wall). As another alternative, the supports 60 could be formed separately from both the internal and external walls 38a, 38b. In the alternative shown in Fig. 3, the supports 60 are integrally formed as part of the wall 38.
    [00044] With reference now in addition to Fig. 7, a schematic sectional-quarter view on an enlarged scale of the safety valve 12 is represented illustrated. This view is similar to the view in Fig. 2, but on a larger scale, so that an arrangement of the magnetic devices 42, 46 can be seen more clearly.
    [00045] As shown in Fig. 7, the magnets 44 of each magnetic device 42 are arranged with their poles longitudinally aligned and with similar poles of adjacent magnets facing each other. That is, the positive poles (+) face each other and the negative poles (-) face each other.
    [00046] The annular magnets 48 of the magnetic device 46 are arranged with their poles radially aligned and with the poles alternating longitudinally along the magnetic device. That is, a magnet 48 will have a positive pole facing radially outward and a negative pole facing radially inward, and an adjacent magnet will have a negative pole facing radially outward and a positive pole facing radially inward.
    [00047] Each positive pole facing radially out of the magnetic device 46 is aligned with an interface between two negative poles facing the magnetic device 42 and each negative pole facing radially out of the magnetic device 46 is aligned with an interface between two poles. positives of the magnetic device 42.
    [00048] The operating member 26 is preferably made of a ferromagnetic material, which acts to concentrate the magnetic flux due to the magnets 48. The housing 36 of this embodiment is preferably made of a non-magnetic material.
    [00049] With reference now further to Fig. 8, a quarter-sectional view of an alternative arrangement of the magnetic devices 42, 46 is represented illustrated. In this embodiment, the housing 36 includes inner and outer walls 38a, 38b, as in the embodiment of Fig. 6, with the outer wall 38b being made of a ferromagnetic material and the inner wall 38a being made of a non-magnetic material. .
    [00050] The magnets 48 of the magnetic device 46 are arranged similar to the embodiment of Fig. 7, however the magnets 44 of the magnetic device 42 have their poles radially, instead of longitudinally, aligned. Each positive pole of magnets 42, facing radially inward, is now aligned with a negative pole of magnets 48, facing radially outward, and each negative pole of magnets 42, facing radially inward, is now aligned with a positive pole of magnets 48 facing radially outward.
    [00051] The wall of the ferromagnetic outer housing 38b acts to concentrate the magnetic flux due to magnets 44. Furthermore, this configuration is expected to reduce the friction in the displacement of the magnetic devices 42 through the chambers 40.
    [00052] With reference now to Fig. 9, a quarter-sectional view of another alternative arrangement of the magnetic devices 42, 46 is represented illustrated. In this embodiment, the housing 36 includes inner and outer walls 38a, 38b, as in the embodiment of Fig. 8, however the outer wall 38b and the inner wall 38a are both made of a non-magnetic material.
    [00053] Magnets 44, 48 are arranged as in the embodiment of Fig. 8, but each magnetic device 42 also includes a flow attractant 62, radially outwardly adjacent to magnets 44. The flow attractant 62 is preferably made of a ferromagnetic material and acts to concentrate the flow due to magnets 44. Instead of a single flow attractant 62 on each magnetic device 42, a separate ferromagnetic support could be provided for each magnet 44, if desired.
    [00054] Note that the magnetic device 42 of Fig. 9 could be used in place of the magnetic device 42 of Fig. 42 of Fig. 7. In other words, the inner and outer walls 38a, 38b of Figure 9 could be replaced through wall 38 of Fig. 7.
    [00055] With reference now further to Figs. 10A - G, another configuration of the safety valve 12 is shown illustrated. In this configuration, the magnetic devices 42 are connected to the operating member 26 and the magnetic device 46 is displaced by the actuator 50.
    [00056] The actuator 50 in this example includes multiple pistons 52, each of which is reciprocally received in one of a series of holes circumferentially spaced apart and longitudinally extending 66. The holes 66 are formed in the wall 38 of the housing 36, which resists a pressure differential between the inside and outside of the safety valve 12. Any number of pistons 52 (including one) can be used to monitor the scope of this description.
    [00057] The pistons 52 are connected to a sleeve 68. The sleeve 68 is propped upwards (as seen in the figures) by a propensity device 70 (such as a spiral spring, compressed gas chamber, etc.). The sleeve 68 is connected to the magnetic device 46, which is magnetically coupled to the magnetic devices 42.
    [00058] When increased pressure is applied to the orifice 56, the pistons 52 move downwards, thereby also displacing the sleeve 68 and the magnetic device 46 downwards against the biasing force exerted by the biasing device 70. The magnetic device 46 is magnetically coupled to the magnetic devices 42 and thus moves together. Once the magnetic devices 42 are connected to the operating member 26, the operating member and the magnetic devices 42 also move downwards, thereby pivoting the hat rack 28 to its open position.
    [00059] In this example, pistons 52 are exposed to a pressure differential between orifice 56 and the outside of the safety valve 12. However, in other examples, pistons 52 could be exposed to a pressure differential between orifice 56 and the internal flow passage 22, a pressurized gas chamber or other pressure source.
    [00060] Magnetic devices 42 are disposed within chambers 40 within the wall of housing 38. Preferably, magnetic devices 42 are circumferentially spaced apart from one another, however it is not necessary for the spacing to be equal. For example, magnetic devices 42 could be unevenly spaced apart or off-center within the wall of housing 38 for various purposes, such as to provide space for extending lines, force springs, etc. (not shown) through the wall.
    [00061] In the example of Figs. 10A-G, the housing wall 38 could be formed of a single piece of material, or it could be comprised of multiple separate pieces of material, as in the example of Fig. 6. Brackets 60 (not visible in Figs. 10A-G, see Figs. 3 & 6) are preferably provided to withstand the pressure applied from the inside and / or outside of the safety valve 12.
    [00062] Although in the examples above from Figs. 4 - 10G the actuator 50 is operated by pressure, in other examples the actuator could be electric, optically or otherwise actuated. For example, a motor and ball screw, or a linear induction motor, or another type of actuator can be used. Actuator 50 is not necessarily concentric with passage 22, but could instead be eccentric (off-center), provided with an "ecxkfcfg" on one side of the safety valve 12, or otherwise arranged.
    [00063] It can now be fully appreciated that the principles of this description enable the safety valve 12 to be constructed in a manner that provides increased magnetic coupling force, as well as increased pressure resistance.
    [00064] The above description is of a safety valve 12 which, in one example, includes housing 36 having multiple chambers 40 extending longitudinally within the pressure support wall 38 of the housing. Each of the magnetic devices 42 is reciprocally arranged in a corresponding one of the chambers 40.
    [00065] The wall of the housing 38 is preferably made of a non-magnetic material. The chambers 40 and the magnetic devices 42 are circumferentially spaced apart within the wall of the housing 38. Each of the magnetic devices 42 is completely surrounded by the wall of the housing 38.
    [00066] The wall of the housing 38 can be composed of multiple components, such as inner and outer walls 38a, 38b. The structural supports 60 between the chambers 40 can provide contact between the inner and outer walls 38a, 38b to increase the ability to withstand the pressure differential between the passage 22 and the outside of the safety valve 12. For example, the supports 60 can transmitting force from the external wall 38b to the internal wall 38a, due to the pressure exerted outside the safety valve 12, and the supports can transmit force from the internal wall to the external wall, due to the pressure exerted inside the passage 22.
    [00067] The magnetic devices 42 are magnetically coupled to the magnetic device 46 attached to the operating member 26 of the safety valve 12. The actuator 50 simultaneously displaces the magnetic devices 42 inside the chambers 40. The annular piston 52 of the actuator 50 is connected to each one of the magnetic devices 42.
    [00068] Also described above is an example of a safety valve 12, which may include multiple first magnetic devices 42, reciprocally arranged within the respective chambers extending longitudinally 40, and a second magnetic device 46 magnetically coupled to the first magnetic devices 42 The first magnetic devices 42 are circumferentially spaced apart and are surrounded by the second magnetic device 46.
    [00069] The first magnetic devices 42 can be attached to an operational member 26 of the safety valve 12.
    [00070] The safety valve 12 can also include a housing 36, having a pressure support wall 38, with chambers 40 extending within the housing wall 38. The housing wall 38 can be made of a non-material magnetic. Each of the first magnetic devices 42 can be completely surrounded by the housing wall 38.
    [00071] The housing wall 38 can be exposed to pressure in an internal longitudinal passage 22, formed through the safety valve 12. At least one support 60 can be positioned between chambers 40, to resist pressure in an internal longitudinal passage. 22, formed through the safety valve 12.
    [00072] An actuator 50 of the safety valve 12 can simultaneously move the first magnetic devices 42.
    [00073] The above description also describes a safety valve 12 which, in one example, can include multiple longitudinally extending chambers 40 and multiple first magnetic devices 42. Each of the first magnetic devices 42 can be reciprocally disposed in a respective of chambers 40, and the first magnetic devices 42 can be attached to an operational member 26 of the safety valve 12.
    [00074] It should be understood that the various examples described above can be used in various orientations, such as inclined, inverted, horizontal, vertical etc. and in various configurations, without deviating from the principles of this description. The embodiments illustrated in the drawings are represented and described merely as examples of useful applications of the principles of the description, which are not limited to any specific details of these embodiments.
    [00075] In the above description of the representative examples, terms fktgekqpcku * Vciu eqoq "ceimc", "cdcizq", "uwretiqt", "ipfetiqt" gVeo + u «q used for convenience when referring to accompanying drawings. In ietcn, "ceioc", "uwretiqt", "rctc eioc" and vetoqu uioincteu teheteo in a direction to the surface fc Vettc cq nqpiq fe wo rq> q, and "cdcizq", "ipfetiqt", "rctc dcizq" and vetoqu uioincteu teheteo in a direction away from the earth's surface along the well, whether the well is horizontal, vertical, inclined, deflected, etc. However, it must be clearly understood that the scope of this description is not limited to any particular directions described here.
    [00076] Naturally, a person skilled in the art, under careful consideration of the above description of representative embodiments, would readily appreciate that many modifications, additions, substitutions, deletions and other changes can be made to these specific embodiments and such changes are within the scope of the principles of this description. Therefore, the foregoing detailed description is to be clearly understood to be given by way of illustration and example only, the spirit and scope of the invention being limited only by the appended claims and their equivalents.
    权利要求:
    Claims (8)
    [0001]
    1. Safety valve (12) for use in an underground well, the safety valve (12) comprising: multiple first magnetic devices (42), reciprocally arranged inside the respective chambers (40) extending longitudinally; and a second magnetic device (46), magnetically coupled to the first magnetic devices (42), characterized by the fact that the first magnetic devices (42) are circumferentially spaced apart and are surrounded by the second magnetic device (46).
    [0002]
    Safety valve (12) according to claim 1, characterized by the fact that the first magnetic devices (42) are attached to an operational member (26) of the safety valve (12).
    [0003]
    Safety valve (12) according to claim 1, characterized by the fact that it further comprises a housing (36) having a pressure support wall (38) and in which the chambers (40) extend within the housing wall (36).
    [0004]
    4. Safety valve (12) according to claim 3, characterized by the fact that the housing wall (36) is made of a non-magnetic material.
    [0005]
    Safety valve (12) according to claim 3, characterized by the fact that each of the first magnetic devices (42) is completely surrounded by the housing wall (36).
    [0006]
    Safety valve (12) according to claim 3, characterized by the fact that the housing wall (36) is exposed to pressure in an internal longitudinal passage (22), formed through the safety valve (12).
    [0007]
    Safety valve (12) according to claim 3, characterized by the fact that at least one support positioned between the chambers (40) resists pressure in an internal longitudinal passage (22), formed through the safety valve ( 12).
    [0008]
    Safety valve (12) according to claim 1, characterized in that an actuator (50) of the safety valve (12) simultaneously displaces the first magnetic devices (42).
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    同族专利:
    公开号 | 公开日
    WO2013039663A2|2013-03-21|
    WO2013039663A3|2013-05-10|
    EP2756157A2|2014-07-23|
    BR112014005508A2|2017-03-21|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-08| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-02-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-03-16| 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 23/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/231,713|2011-09-13|
    US13/231,713|US8919730B2|2006-12-29|2011-09-13|Magnetically coupled safety valve with satellite inner magnets|
    PCT/US2012/051983|WO2013039663A2|2011-09-13|2012-08-23|Magnetically coupled safety valve with satellite inner magnets|
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