• 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:
    well pump with seal section having labyrinth flow path in a metal bellows. the present invention relates to a submersible well pump assembly that has a rotary pump, a motor, and a seal section, coupled between the motor and the pump. the seal section has a cylindrical housing, having an upper and lower adapter and an axle extending axially through the housing. a guide tube surrounds the shaft and a bellows surrounds the guide tube. a well fluid passage communicates the well fluid to a well fluid chamber, between the bellows and the housing. a guide tube passage extends axially inside the guide tube, between the inside and outside of the guide tube from an upper to a lower portion of the guide tube, to communicate the lubricant in the engine with the lubricant inside the bellows . 20129980v1
    公开号:BR112013033715B1
    申请号:R112013033715-0
    申请日:2012-06-29
    公开日:2020-08-18
    发明作者:Kelsey A. Mckinney；Dan A. Merrill
    申请人:Baker Hughes Incorporated；
    IPC主号:
    专利说明:

    Cross-reference to the related Patent Application
    [0001] This patent application claims priority for the provisional patent application SN 61 / 502,660 filed on June 29, 2011. Field of the Invention
    [0002] The present invention relates in general to submersible oil well pumps, in particular, to a seal section located between a centrifugal pump and an electric motor, the seal section including a metal bellows. Background of the Invention
    [0003] Submersible well pump assemblies can be used in oil and gas wells to extract fluids from well liquids. One type employs a rotary pump driven by a motor from inside the well. The motor is usually an electric motor, and the pump can be a centrifugal pump. The motor is loaded with a dielectric lubricant to lubricate the bearings and help to cool the motor.
    [0004] The motor seal or protector section is coupled between the pump and the motor. The seal section has a flexible element to reduce the difference between the hydrostatic pressure in the well and the lubricant pressure in the engine. The flexible element can be an elastomeric piece or metal bellows. The seal section has a well fluid duct, which communicates the well fluid with one side of the flexible element, usually the outer side. The seal section has a lubricant duct, which communicates the lubricant in the engine with the lubricant chamber, usually on the inside of the flexible element. A guide tube can be located inside the flexible element that surrounds the shaft.
    [0005] Upper and lower seals seal the shaft within the seal section. Typically, some well fluid leaks through the seals, eventually entering the flexible element's lubricant chamber. If the well fluid is able to migrate from the lubricant chamber to the engine, the life of the engine is very likely to be shortened. Penetration of well fluid in particular can be a problem in inclined wells. In the past, many structures have been provided to cause any well fluid that could enter the lubricant chamber to flow upwards, and then downwards, in a maze or serpentine arrangement. The lubricant is usually lighter than the well fluid, so the labyrinth demands a path, which makes it easier for the well fluid to penetrate the engine.
    [0006] While successful, the space to provide these labyrinth structures may be inadequate. For example, a metal bellows can have a portion of diameter smaller than another portion. The smaller diameter portion extends to the larger diameter portion. The inner diameter of this smaller diameter portion is often very close to the guide tube, and may even touch it. There may not be enough space to include labyrinth tubes in the bellows. summary
    [0007] A submersible well pump assembly of the present invention includes a rotary pump, a motor to drive the pump, and a seal section coupled to the motor and pump. The seal section has a cylindrical housing having a longitudinal geometric axis, an upper adapter, and a lower adapter. A shaft extends axially through the housing, upper adapter, and lower adapter, to transmit motor rotation to the pump. A guide tube surrounds the shaft, and extends between the upper adapter and the lower adapter. A flexible element surrounds the guide tube, having an upper end sealed against the upper adapter and a lower end sealed against the lower adapter, defining a lubricant chamber, between the guide tube and the flexible element, and a fluid chamber. well, between the flexible element and the housing. The housing has a well fluid passageway to communicate the well fluid to the well fluid chamber, to apply a hydrostatic force to the flexible element, which corresponds to a hydrostatic force in the well fluid. At least one guide tube passage extends axially within the guide tube, between the inside and outside of the guide tube, from an upper to a lower portion of the guide tube. An upper portion of the guide tube passage makes fluid communication with the lubricant in the lubricant chamber. A lower lubricant communication passage in the lower adapter makes fluid communication with a lower portion of the guide tube passage to communicate lubricant in the engine with the lubricant chamber through the guide tube passage.
    [0008] Preferably, the lower lubricant communication passage is sealed from an internal annular space between the guide tube and the shaft. In addition, the upper portion of the guide tube passage is sealed from the internal annular space between the axis and the guide tube. The guide tube passage can be a cylindrical hole extending parallel with the geometric axis of the guide tube, and having a diameter less than the radial thickness of the guide tube, from the inside to the outside of the guide tube.
    [0009] The flexible element may be a bellows with a portion of larger diameter and a portion of smaller diameter, the portion of smaller diameter extending into the portion of larger diameter and having an inner side substantially in contact with the outside of the tube - guide. In the configuration shown, the smaller diameter portion defines the upper end of the bellows.
    [0010] An upper seal is mounted between the adapter and the shaft. A top cover can be attached to the bottom side of the top adapter, below the seal. An upper end of the guide tube is sealingly attached to the top cover, isolating the outside of the guide tube from the internal annular space, between the guide tube and the shaft.
    [0011] A lower seal is mounted between the lower adapter and the shaft. A base cover can be fixed sadly to the lower adapter, above the lower seal. The lower end of the guide tube is fixed sadly to the base cover. The lower lubricant communication passage extends through the base cap, and provides fluid communication with the lower end of the axial passage, at a point that is sealed from an internal annular space between the guide tube and the shaft, and above the bottom seal.
    [0012] An upper leak chamber can be located below the seal and above the guide tube, to receive any leakage of well fluid that passes beyond the upper seal. An upper leak chamber may be above the lower seal and below the guide tube, to receive any leakage of well fluid that passes beyond the lower seal. The internal annular space between the shaft and the guide tube between the upper and lower leak chambers can fluidly communicate with the upper and lower leak chambers. The guide tube passage is sealed from the internal annular space. There may be one or more guide tube passages, each of which may be a cylindrical hole, and are circumferentially, spaced and parallel. Brief Description of Drawings
    [0013] Figure 1 is a cross-sectional view of a seal section, constructed in accordance with the present invention;
    [0014] Figure 2 is a cross-sectional view of the seal section of Figure 1, taken along line 2-2;
    [0015] Figure 3 is an enlarged cross-sectional view of a portion of the seal section of Figure 1;
    [0016] Figure 4 is a cross-sectional view of the seal section of Figure 1, taken at 90 ° from the cross-sectional view of Figure 1;
    [0017] Figure 5 is a side view of an electric pump set containing the seal section of Figure 1. Detailed Description
    [0018] Referring to Figure 1, an upper seal section 11, which can also be called "motor protector", has a cylindrical housing 13. An upper adapter 15 is fixed to threads formed in the internal diameter of the housing 13. The adapter 15 has a central hole 17b, through which a rotatable driving shaft 19 extends. A bushing 21 in hole 17 radially supports shaft 19, but does not form a seal around shaft 19. An upper seal 23 is mounted on the adapter hole 17, above bushing 21, to provide a seal around axis 19. The upper seal 21 is typically a mechanical face seal, having a rotational component 23a, which rotates with axis 19 and engages a stationary component 23b, sealed in the top adapter 15 in the hole 17. The rotary seal component 23a is exposed to the well fluid and serves to reduce the leakage of the well fluid in the housing 13.
    [0019] The upper adapter 15 has a well fluid passage 25 displaced from the central hole 17, which admits the well fluid into the housing 13. The entrance to the well fluid passage 25 is illustrated located at the upper end of the upper adapter 15, but the inlet could alternatively be located on the outside diameter of the upper adapter 15.0 upper adapter 15 has means for securing the upper seal section 11 to a component above, which in this configuration comprises threaded holes 29.
    [0020] A top cover 31 is mounted on the bottom side of the top adapter 15. The mounting arrangement may vary. Referring to Figure 3, in this configuration, the top cap 31 has a cylindrical neck 33, which inserts and seals a lower hole recess 35 of the top adapter 17. The sealing engagement of the top cap 31, with the top adapter 15, defines an upper leak chamber 26 on the upper side of the top cap 31. The upper leak chamber 36 receives any leakage of well fluid that passes beyond the upper seal 23. The top cover 31 has a central hole through which axis 19 passes, but without a seal in the central hole. The top adapter 15 has a cylindrical skirt 37 that extends downwardly from a bottom side of the top adapter 51, concentric with the hole 17. An outer diameter portion 19 of the top cap 31 provides a seal against the inner diameter of the skirt 37. One or more lubricant ducts 41 extend from the bottom side of the top cap 31 to the upper side at a point between the neck 33 and the skirt 37. The lubricant ducts 41 can be inclined in relation to the geometric axis of the axis 19 as shown.
    [0021] Referring to Figure 4, the upper ends of the lubricant ducts 41 communicate with a lubricant expelling passage 43 on the top adapter 15. The lubricant expelling passage 43 leads to one or more check valves 45. The valves retainer 45 allow the lubricant to flow out of the ducts 41, and to be routed back to housing 13. A plug 47, in a radial section of the lubricant expelling passage 43, blocks the passage 43 of the well fluid outside the top adapter 15.
    [0022] Referring again to Figure 1, a bellows or upper flexible element 49 has an upper end 51 attached to the lower side of the top cover 31. The upper bellows 49 is a cylindrical element having folds or undulations in the side wall, to allow its axial extension or contraction. The upper bellows 49 is preferably metallic, for use in high temperature wells. The upper bellows 49 has an upper end 51, fixed and sealed on the lower side of the top cover 31. The lubricant-expelling passages 43 communicate with the interior of the upper bellows 49. The lower end 53 of the upper bellows 49 is fixed to a inner flange at a lower end of a rigid sleeve 55. The sleeve 55 extends upwardly around a portion of the upper bellows 49 and has an outer flange, which forms the upper end 57 of a lower bellows 59.
    [0023] A lower end 61 of the lower bellows 59 is attached to the base cover 63, which is mounted stationary in the housing 13. The lower bellows 59 have larger internal and external diameters than the upper bellows 49. The lower bellows 59 is also preferably metallic and has ripples or folds in its side wall, to allow its extension and axial contraction. The interiors of the upper and lower bellows 49, 59 communicate fluidly, defining an inner lubricant chamber 64. An outer chamber or well fluid chamber 66 is defined by the space between the inner side wall of housing 13 and the outer sides of the bellows 49, 59. When the pressure in the lubricant chamber 64 exceeds the pressure of the well fluid chamber 66, the lower bellows 59 extends axially in length, which causes sleeve 55 to move upwards, contracting the length of the upper bellows 49 When the pressure in the lubricant chamber 64 is less than the pressure of the well fluid chamber 66, the reverse is true.
    [0024] A guide tube 65 surrounds shaft 19 and extends from the base cover 63 towards the top cover 31. The guide tube 65 extends through the upper and lower bellows 49, 59. The bellow internal diameter upper 49 is only slightly larger than the outer diameter of the guide tube 65, and can be substantially in contact with the guide tube 65. The guide tube 65 has a plurality of upper ducts 67 (Figure 3) extending through the wall cylindrical side of the guide tube 65, near the upper end. At least one, and preferably two axial guide tube passages 69 are formed on the side wall of guide tube 65, and extend from the upper end to the lower end of guide tube 65. Each guide tube pass 69 is a cylindrical hole with a diameter less than the thickness of the guide tube 65, between the inside and the outside. As shown in Figure 2, in this example, two guide tube passages 69 are formed, spaced 180 ° circumferentially from each other. A small internal clearance or annular space 70 is located between the inner diameter of the guide tube 65 and the outer diameter of the shaft 19. The radial ducts 67 connect axial passages 69 by placing the axial passages 69 in fluid communication with the engine lubricant in the inner bellows chamber 64. Guide tube passages 69 are sealed from inner annular space 70. Lubricant chamber 69 is also sealed from inner annular space 70.
    [0025] The lower end of the guide tube 65 connects to the base cap 63. The lower lubricant communication passages 71 are located on the base cap 63. The lower lubricant communication passages 71 are also sealed from the internal annular space. 70, and extend from the lower end of the axial passages 69, downwards and upwards.
    [0026] A central adapter 73, which can also be considered a lower adapter, has external threads to thread the internal threads at the lower end of housing 13. The central adapter 73 has a lubricant communication duct 75 with an upper end communicating fluid with the lower ends of the lower lubricant communication passages 71. Communication duct 75 extends to the bottom side of the central adapter 73. In this example, the central adapter 73 also has external threads threaded on the inner threads of the lower seal section 77, as partially shown. The central adapter 73 has a first bore recess 79 at its upper end and a second bore recess 81 connecting with a lower edge of the first bore recess 79. The first bore recess 79 has a larger diameter than the second bore recess 81. The base cap 63 has an upper outer diameter portion, which seals the first hole recess 79 and a lower outer diameter portion seals the second hole recess 81. The base cap ducts 71 end between the bore counters 79 and 81, forming an annular gallery 83 that communicates with the central adapter duct 79.
    [0027] One or more lower seals 85 are mounted on the central adapter to provide a seal around axis 19. The lower seal 85 can be a mechanical face seal of the same type as the upper seal 23. If two lower seals 85 are used, they would be mounted against each other, with rotating components close together. The sealing engagement of the base cap 63 with the second hole recess 81 plus the seal 85, defines a chamber 86. Chamber 86 serves as a lower well fluid leak chamber to collect any well fluid leak that passes the lower seal 85. Chamber 86 makes fluid communication with the annular space 70 between axis 19 and guide tube 65, so it also communicates with chamber 36. A bushing 87 on central adapter 73, below seal 85, supports radially the axis 19.
    [0028] Referring to Figure 4, the central adapter 73 may have lubricant expelling ducts 88, which serve the same purpose in the lower seal section 77 as lubricant expelling ducts 45. The lower seal section 77 has upper bellows and bottom similar to bellows 49, 59. The lower end of the lower lubricant communication duct 75 communicates with the outside of the upper bellows in the lower seal section 77. The base cap section 77 can also have a guide tube similar to the guide tube 65 and top cap similar to top cap 31. In addition, the bottom seal section 77 usually has an axial bearing to absorb axial force applied to shaft 19. The top and bottom seal sections 11.77 also they have several ducts, to supply lubricant and expel air.
    [0029] Referring to Figure 5, a pump 89 having an intake port 91, which is normally connected to the upper adapter 15 (Figure 1) of the upper seal section 11. Pump 89 is typically a centrifugal pump having a plurality of rotor and diffuser stages. A motor 93, which is normally an electric motor, has an upper end that connects the lower seal section 77 in this configuration. The electric motor 93 is loaded with a dielectric lubricant, in communication with the lubricant in the seal sections 11, 77.
    [0030] In operation, engine 93 is connected to sections 11, 77. Lubricant is introduced into the subset of engine 93 and seal sections 11, 77, and air expelled or evacuated. When the set of Figure 5 is lowered into a well with fluid, the well fluid enters the outer well fluid chamber of the bellows 66 via fluid passage 25. The well fluid often contains a large percentage of water, which can be highly damaging to engine 93, if the well fluid enters engine 93. Referring to Figure 1, the hydrostatic pressure of the well hole in the well fluid chamber 66 acts against the bellows 49, 59, tending to make the bellows lower 59 to contract in length. The lubricant inside the lubricant chamber 64 tends to resist shrinkage. When the pump set reaches the selected depth, the operator energizes the motor 83, which rotates the shaft 18, and moves the pump 89. When the motor 93 operates, it generates heat, which causes expansion of the lubricant. Expansion of the lubricant causes the lower bellows 59 to extend axially. If the lower bellows 59 reaches the fully extended position, a portion of the lubricant will be expelled from the lubricant chamber 64 through the top cover ducts 41 (Figure 3), and expelled through the lubricant expelling passages 43 (Figure 4). The expelled lubricant flows through the check valves 45 to the outer chamber 66. When the engine 93 is turned off, the lubricant cools, and the lower bellows 59 contracts in length. This contraction causes the upper bellows 49 to extend in length.
    [0031] In operation, some leakage of fluid that passes beyond seal 23 usually occurs. The well fluid flows beyond the bushing 21 to the well fluid leak chamber 36 (Figure 3). The well fluid is heavier than the lubricant located in the annular gap 709 between shaft 19 and the guide tube 65. Consequently, the well fluid, which has penetrated, descends through the annular gap 70 enters the well fluid leak chamber. 86 (Figure 1). However, the pump assembly can be oriented, almost horizontally, facilitating the flow of well fluid up and down the seal sections 11, 77. Some leakage of fluid in chamber 86 occurs, resulting in the well fluid pass past seal 85 and bushing 87 to lower seal section 77. This well fluid enters a similar chamber in the lower seal section 77 to chamber 36 above top cap 31 in the upper seal section 11. Some fluid well can eventually enter the bellows lubricant chamber 64 in the upper seal section 11. Before any well fluid in the bellows lubricant chamber 64 can enter the lower seal section 77, the well fluid would have to flow along a serpentine path to the outside of the guide tube 65, through the upper ducts 67 (Figure 3) in the guide tube 65, and to the axial guide tube passages 69. The guide tube passages 69 and the outside of the guide tube 65 are isolated from the well fluid in the leakage of well fluid 36, 86 and well fluid into the housing well fluid chamber 66. Normally, any well fluid in the bellows lubricant chamber 64 will be located closer to the base cap 63 than to the top cap 31.
    [0032] Instead of two seal sections, a single seal section, having a guide tube including axial passages, could be employed. In this situation, the central adapter 73 is attached to the motor 83. In addition, more than two sections can be mounted together. In addition, instead of comprising separate axial passages formed in a single guide tube, two concentric guide tubes can be used, the axial passage being an annular space formed between the guide tubes.
    [0033] While the present invention has been described in only one form, it should be apparent to those skilled in the art that the present invention is not limited to that form, but instead, it is susceptible to many modifications, without departing from the scope of the same .
    权利要求:
    Claims (12)
    [0001]
    1. Submersible pump assembly, comprising: a rotary pump (89); a motor (93) to drive the pump (89); a seal section (11, 77), coupled between the motor (93) and the pump (89), comprising: a cylindrical housing (13), having a longitudinal geometric axis, an upper adapter (15), and a lower adapter ; an axis (19) extending axially through the housing (13), upper adapter (15), and lower adapter, for transmitting rotation of the motor (93) to the pump (89); a guide tube (65), surrounding the shaft (19), and extending between the upper adapter (15) and lower adapter; a flexible element (49), surrounding the guide tube (65), and having an upper end (51) sealed with respect to the upper adapter (15), and a lower end (53) sealed with respect to the lower adapter, defining a lubricant chamber (64) between the guide tube (65) and the flexible element (49), and a well fluid chamber (66) between the flexible element (49) and the housing (13); the housing (13) having a well fluid passage, to communicate the well fluid to the well fluid chamber (66), to apply a hydrostatic force to the flexible element (49), which corresponds to a hydrostatic force of the fluid well; characterized by the fact that at least one guide tube passage (69), extending axially within the guide tube (65), between the inside and outside of the guide tube (65), from an upper to a lower portion the guide tube (65); an upper portion of the guide tube passage (69), in fluid communication with the lubricant in the lubricant chamber (64); a lower lubricant communication passage (71) in the lower adapter, in fluid communication with a lower portion of the guide tube passage (69), to communicate the lubricant in the motor (93) with the lubricant chamber (64) through the guide tube passage (69), where any well fluid that penetrates the lubricant chamber (64) must descend through the guide tube passage (69) to reach the engine (93).
    [0002]
    2. Assembly according to claim 1, characterized by the fact that the upper portion of the guide tube passage (69) is sealed from an internal annular space (70) between the axis (19) and the guide tube ( 65).
    [0003]
    3. Assembly according to claim 1, characterized by the fact that the guide tube passage (69) comprises a cylindrical hole, extending parallel with a geometric axis of the guide tube (65), and having a smaller diameter than the radial thickness of the guide tube (65), from the inside to the outside of the guide tube (65).
    [0004]
    4. Assembly according to claim 1, characterized by the fact that the flexible element (49) comprises a bellows, with a portion of larger diameter and a portion of smaller diameter, the portion of smaller diameter extending towards the portion of larger diameter, and having an internal side in substantial contact with the outside of the guide tube (65).
    [0005]
    5. Assembly according to claim 4, characterized in that the smaller diameter portion defines an upper end of the bellows (49).
    [0006]
    6. Assembly according to claim 1, characterized by the fact that it additionally comprises: an upper seal (23) mounted between the upper adapter (15) and the shaft (19); an upper leak chamber (36) disposed below the upper seal (23) and above the guide tube (65), to receive any leakage of well fluid that passes beyond the upper seal (23); a lower seal (85), mounted between the lower adapter and the shaft (19); a lower leak chamber (86), above the lower seal (85) and below the guide tube (65), to receive any leakage of well fluid that passes beyond the lower seal (85); an annular space (70), between the shaft (19) and the guide tube (65), between the upper (36) and lower (86) casting chambers, in fluid communication with the upper (36) and lower casting chambers (86); and the guide tube passage (69) being sealed from the internal annular space (70).
    [0007]
    7. Assembly according to claim 1, characterized by the fact that said at least one guide tube passage (69) comprises at least two guide tube passages (65), each one being a cylindrical hole, circumferentially spaced and parallel.
    [0008]
    8. Assembly according to claim 1, characterized by the fact that the lower lubricant communication passage (71) is sealed from the internal annular space between the guide tube (65) and the shaft (19).
    [0009]
    9. Assembly according to claim 1, characterized by the fact that it additionally comprises: an upper seal (23), mounted between the upper adapter (15) and the shaft (19); a top cover (31), attached to the bottom side of the top adapter (15), below the seal (23); and an upper end of the guide tube (65), which is sealingly attached to the top cover (31), and isolating the outside of the guide tube (65) from the internal annular space (70), between the guide tube (65) and the axis (19).
    [0010]
    10. Assembly according to claim 1, characterized by the fact that it additionally comprises: a lower seal (85), mounted between the lower adapter and the shaft (19); a base cover, fixed sadly to the lower adapter, above the lower seal; a lower end of the guide tube (65) sealingly attached to the base cover; and the lower lubricant communication passage, extending through the base cap and in fluid communication, with a lower end of the axial passage, at a point that is sealed from the internal annular space (70) between the guide tube (65 ) and the axis (19).
    [0011]
    11. Method of operating a submersible well pump assembly, having a rotary pump (89), a motor (93), and a seal section (11, 77) coupled between the motor (93) and the pump (89) , comprising a cylindrical housing (13), having a longitudinal geometric axis, an upper adapter (15), and a lower adapter, and the assembly still having a driving axis (19), the method comprising: providing the seal section (11 , 77) with a guide tube (65) surrounding the shaft (19), defining an internal annular space (70), a flexible element (49) surrounding the guide tube (65), defining a lubricant chamber (64) between the guide tube (65) and the flexible element (49), and a well fluid chamber (66) between the flexible element (49) and the housing (13); operating the motor (93) to rotate the shaft (19), and start the pump (89); communicating the well fluid with the well fluid chamber (66), to apply a hydrostatic force to the flexible element (49), which corresponds to a hydrostatic force of the well fluid; characterized by the fact that the method comprises: providing the guide tube (65) with at least one guide tube passage (69) extending axially from an upper portion to a lower portion of the guide pipe (65), and sealing the passage of guide tube (69) of the internal annular space (70); communicate the lubricant in the lubricant chamber (64) with the upper portion of the guide tube passage (69); and communicating lubricant in a lower portion of the guide tube passage (69) with the lubricant in the engine (93).
    [0012]
    12. Method, according to claim 11, characterized in that it additionally comprises: sealing the upper and lower portions of the shaft (19) with upper (23) and lower (85) seals; report any leakage that passes beyond the seals (23, 85) into the internal annular space (70) between the shaft (19) and the guide tube (65); and sealing the internal annular space (70) for communication with the lubricant chamber (64) and / or providing the guide tube (65) with at least one guide tube passage (69) comprises drilling a well hole cylindrical from one end to the other of the guide tube (65), the hole having a geometric axis that is displaced and parallel to a geometric axis of the guide tube (65).
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    同族专利:
    公开号 | 公开日
    EP2726704B1|2017-09-27|
    EP2726704A4|2016-04-13|
    WO2013003760A3|2013-03-28|
    US20130004344A1|2013-01-03|
    US8932034B2|2015-01-13|
    CA2840417C|2016-04-12|
    WO2013003760A2|2013-01-03|
    CA2840417A1|2013-01-03|
    EP2726704A2|2014-05-07|
    BR112013033715A2|2017-01-24|
    NO2838892T3|2018-05-05|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-10-29| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-05-19| B09A| Decision: intention to grant|
    2020-08-18| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 29/06/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161502660P| true| 2011-06-29|2011-06-29|
    US61/502,660|2011-06-29|
    PCT/US2012/045016|WO2013003760A2|2011-06-29|2012-06-29|Well pump with seal section having a labyrinth flow path in a metal bellows|
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