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WO2024086917A1 - Presse-étoupe à auto-alignement - Google Patents

Presse-étoupe à auto-alignement Download PDF

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Publication number
WO2024086917A1
WO2024086917A1 PCT/CA2023/051369 CA2023051369W WO2024086917A1 WO 2024086917 A1 WO2024086917 A1 WO 2024086917A1 CA 2023051369 W CA2023051369 W CA 2023051369W WO 2024086917 A1 WO2024086917 A1 WO 2024086917A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
spherical surface
stuffing box
spherical
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA2023/051369
Other languages
English (en)
Inventor
Dietmar SEDENS
Werner Harder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Domino Machine Inc
Original Assignee
Domino Machine Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Domino Machine Inc filed Critical Domino Machine Inc
Publication of WO2024086917A1 publication Critical patent/WO2024086917A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/184—Tightening mechanisms
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/187—Self-aligning stuffing-boxes

Definitions

  • the present disclosure relates in general to stuffing boxes installed in conjunction with pump jacks on wellheads for petroleum wells, and relates in particular to stuffing boxes designed to accommodate angular misalignment between the bore of a stuffing box and a reciprocating or rotating pump rod string incorporating a “polished rod” disposed within the stuffing box bore.
  • a string of steel production tubing is positioned in the wellbore and extends from the subsurface production zone up to a wellhead structure at the surface.
  • a downhole pump is disposed within the production tubing in the production zone to raise well fluids (e.g., oil, gas, and formation water) to the surface, by reciprocating vertical movement of a travelling valve incorporated into the pump.
  • the travelling valve is reciprocated by a pump rod string (or “sucker rod” string) extending upward within the production tubing to the wellhead where it connects to the lower end of a “polished rod” that extends upward through, in sequence, a “wellhead tee” and a “stuffing box”, with the upper end of the polished rod being connected to a well pumping unit.
  • a pump rod string or “sucker rod” string
  • This type of pump is commonly referred to as a “sucker rod pump”.
  • a “pump jack” comprising a “walking beam” mechanism that reciprocates the sucker rod string connected to the downhole pump, by means of a drive mechanism typically comprising an electric motor or an internal combustion engine, a gear reduction mechanism, a counterweight system, and a braking system.
  • a typical walking beam pump jack has a so-called “horse’ s head” at one end.
  • the horse’ s head carries a “bridle” which in turn is connected to the upper end of the polished rod.
  • Actuation of the pump jack causes the walking beam to move in seesaw or rocking-horse fashion such that the horse’s head moves up and down, reciprocating the polished rod and sucker rod string such that each upstroke of the rod string causes the downhole pump to raise the column of well fluids a corresponding distance upward within the production string, and thus causing a portion of the lifted fluid column to be discharged from the production string, via the wellhead tee, with each upstroke.
  • a typical stuffing box has a longitudinal bore lined with packing material that tightly surrounds the polished rod to provide a dynamic seal along the length of the polished rod, to contain wellbore pressure and prevent fluid leakage as the polished rod is reciprocated through the stuffing box by the pumping unit.
  • the longitudinal axes of both the stuffing box bore and the polished rod will be perfectly coaxial and vertical.
  • angular misalignment between the polished rod and the stuffing box can cause various problems such as increased friction between the reciprocating polished rod and the stuffing box’s packing material (due to induced lateral loads on the packing material resulting from the misalignment), causing increased wear and deterioration of the packing material and associated seal elements, allowing entry of debris and other contaminants into the stuffing box, and impairing the stuffing box’s pressure containment and fluid containment functions. Consequently, angular misalignment can significantly reduce the service life of the stuffing box’s packing material and related seal components, necessitating more frequent replacement thereof.
  • the direct costs of replacing the packing material and seals might be comparatively modest, the costs in terms of standby labour and loss of production can be high.
  • the present disclosure describes and illustrates embodiments of a stuffing box that accommodates angular misalignment between the stuffing box bore and a polished rod passing through the stuffing box bore and connected at its lower end to a sucker rod string and at its upper end to a pumping unit (either directly or through intermediary structure).
  • the stuffing box comprises:
  • a generally axisymmetric upper component (which may be made up of multiple coaxially-connected subcomponents) having an upper end, a lower end, and a central bore (for receiving a polished rod) extending between the upper and lower ends of the upper component; and
  • a base component defining a central opening that is concentric about a longitudinal (i.e., vertical) primary axis of the stuffing box and extends vertically through the base component, with the base component being configured for concentric mounting to the top of a wellhead, such as by means of a thread, a bolted flange, clamps, or any other suitable means known to persons skilled in the art.
  • the term “spherical surface” means a surface having a curvature corresponding to a portion of the surface of a sphere.
  • a lower portion of the upper component defines a convex spherical surface that is matingly engageable with a concave spherical surface formed in the base component and surrounding the central opening of the base component, with the concave spherical surface having a spherical centerpoint and having the same spherical radius as the convex spherical surface of the upper component, and with the base component being configured to retain the convexly spherically-surfaced lower portion of the upper component and prevent vertical displacement of the upper component relative to the base component, while allowing the upper component to freely rotate or pivot, relative to the base component and within a defined angular pivot range, about any one of many possible horizontal or tilted pivot axes passing through the spherical centerpoint.
  • the upper component of the disclosed stuffing box is readily rotatable or pivotable, in the manner of a universal joint, to accommodate angular misalignment of a polished rod, relative to the primary axis of the stuffing box and in any direction, at a angular offset that is within the pivot range of the upper component of the stuffing box, so as to keep the central bore of the upper component axially aligned with the polished rod, or to bring the central bore into alignment with the polished rod, without inducing significant if any lateral forces on packing material disposed around the polished rod within the central bore of the upper component.
  • Suitable seal elements e.g., O-rings
  • the base component may be configured and fabricated in any suitable fashion to enable retention of the convexly spherically-surfaced lower portion of the stuffing box within the concavely spherically- surfaced central opening of the base component, such as (by way of nonlimiting example only) by providing the base component as an assembly of a unitary (i.e., one- piece) lower base element defining a lower portion of the central opening of the base component, and either a unitary upper base element or a two-piece, “split-ring”-style upper base element defining an upper portion of the central opening of the base component, with the upper base element being installed and fastened (such as by bolting) to the lower base element after the convexly spherically-surfaced lower portion of the upper component has been seated within the lower portion of the concave central opening of the base component.
  • a first exemplary embodiment of self-aligning stuffing box in accordance with the present disclosure comprises a generally axisymmetric upper component having an upper end, a lower end, and a central bore extending between the upper and lower ends of the upper component, with the central bore having a central bore axis; and a base component having a generally planar upper surface, a generally planar lower surface generally parallel to the upper surface, and a primary axis perpendicular to the lower surface.
  • the base component defines a central opening that is concentric about the primary axis and extends between the upper and lower surfaces of the base component; and the base component also defines a concave spherical surface surrounding the central opening, with the concave spherical surface having a spherical radius, and having a spherical centerpoint that is coincident with the primary axis.
  • the upper component has a lower portion defining a convex spherical surface having a spherical radius and a spherical centerpoint, wherein:
  • the convex spherical surface is matingly engageable with the concave spherical surface such that the spherical centerpoint of the convex spherical surface is coincident with the spherical centerpoint of the concave spherical surface.
  • the base component is configured to prevent vertical displacement of the upper component relative to the base component, while allowing the upper component to rotate, relative to the base component and within a defined angular pivot range, about a selected pivot axis passing through the spherical centerpoint of the concave spherical surface.
  • a second exemplary embodiment of self-aligning stuffing box in accordance with the present disclosure comprises a generally axisymmetric upper component having an upper end, a lower end, and a central bore extending between the upper and lower ends of the upper component, with the central bore having a central bore axis; and a base component having an upper end, a lower end, a generally planar upper surface, and a primary axis perpendicular to the upper surface.
  • a lower portion of the base component has a threaded pin end for mounting to a wellhead.
  • the base component defines a central opening that is concentric about the primary axis and extends between the upper and lower ends of the base component; and the base component also has a concave spherical surface extending downward from the upper surface of the base component and surrounding the central opening, with the concave spherical surface having a spherical radius, and having a spherical centerpoint that is coincident with the primary axis.
  • the upper component has a lower portion defining a convex spherical surface having a spherical radius and a spherical centerpoint, wherein:
  • the convex spherical surface is matingly engageable with the concave spherical surface such that the spherical centerpoint of the convex spherical surface is coincident with the spherical centerpoint of the concave spherical surface;
  • the base component is configured to prevent vertical displacement of the upper component relative to the base component, while allowing the upper component to rotate, relative to the base component and within a defined angular pivot range, about a selected pivot axis passing through the spherical centerpoint of the concave spherical surface.
  • the base component of the stuffing box comprises an upper base element defining an upper portion of the concave spherical surface, and a lower base element defining a lower portion of the concave spherical surface; the lower base element has an upper surface proximal to the spherical centerpoint; and the upper base element has a lower surface configured for mounting to the upper surface of the lower base element so as to retain the lower portion of the upper component and prevent vertical displacement of the upper component relative to the lower component, without preventing the upper component from rotating about the selected pivot axis.
  • the upper base element may be a two-piece split-ringstyle element, or it may comprise two or more sub-elements interconnectable along vertical interface surfaces, or it may be a unitary toroidal element.
  • the upper component of the stuffing box may comprise is of unitary component an upper section and a lower section, with a lower end of the upper section being threadingly mountable to an upper end of the lower section, and with the lower section carrying the convex spherical surface.
  • FIGURE 1 is a vertical cross-section through an exemplary prior art stuffing box.
  • FIGURE 2 is a vertical cross-section through a first exemplary embodiment of a stuffing box in accordance with the present disclosure, shown with a polished rod extending through the bore of the stuffing box and deflecting the stuffing box’s spring-loaded pollution control flapper valve into its open position.
  • FIGURE 3 is a vertical cross-section through a stuffing box generally similar to the stuffing box in FIG. 2, shown in a rotationally-deflected position to accommodate angular misalignment of a polished rod (not shown for clarity) relative to the stuffing box bore.
  • FIGURE 4 is a vertical cross-section through a second exemplary embodiment of a stuffing box in accordance with the present disclosure, generally similar to the stuffing box in FIGS. 2 and 3 except that the base component of the stuffing box is provided with a “pin” end to enable mounting to a wellhead by means of a standard API tapered thread connection (as an alternative to a bolted flange connection).
  • FIG. 1 illustrates an example 50 of a prior art stuffing box, shown with a polished rod 40 extending through a central bore 55 of stuffing box 50.
  • Prior art stuffing box 50 includes:
  • a base component 10 comprising a mounting flange 12 and a generally cylindrical stem section 14 extending upward from mounting flange 12;
  • a generally cylindrical barrel section 20 having a lower portion 22 coaxially mountable over stem section 14 (such as by a threaded connection as illustrated) and an upper portion 24;
  • a top cap 26 mountable over upper portion 24 of barrel section 20 (such as by a threaded connection as illustrated), and having an opening to allow passage of polished rod 40.
  • Central bore 55 of stuffing box 50 extends throughout the length of stuffing box 50.
  • the diameter of central bore 55 within upper portion 24 of barrel section 20 is greater than the diameter of polished rod 40, to provide an annular space to accommodate packing material 30 and associated packing retainers 32 between polished rod 40 and the portion of central bore 55 passing through upper portion 24 of barrel section 20;
  • the diameter of central bore 55 within lower portion 22 of barrel section 20 is greater than the diameter of central bore 55 within upper portion 24 of barrel section 20 polished rod 40, to provide an annular space to accommodate stem section 14 of base component 10 as well as packing material 30 and associated packing retainers 32 between polished rod 40 and the portion of central bore 55 passing through stem section 14.
  • An annular seal element 35 (such as an O-ring) is provided in an upper region of stem section 14 for sealing against the portion of central bore 55 passing through lower portion 22 of barrel section 20.
  • Mounting flange 12 of base component 10 is adapted for mounting to a wellhead by any suitable means.
  • mounting flange 12 is illustrated as being adapted for mounting to a wellhead using bolts, as generally denoted by reference number 11.
  • Stuffing box 50 and its central bore 55 share a longitudinal axis X50, and polished rod 40 has a longitudinal axis X40.
  • axis X40 precisely coincides with axis X50.
  • FIG. 1 illustrates a pivoting, spring-loaded flapper valve 16 (also referred to as a pollution control valve) mounted to a bottom surface of mounting flange 12 such that flapper valve 16 will be biased toward a closed position sealing off the lower end of central bore 55 passing through mounting flange 12 when polished rod 40 is not present (as indicated by broken lines in FIG. 1), and will be deflected to an open position (as shown in FIG. 1) by the insertion of polished rod 40 into stuffing box 50.
  • flapper valve 16 also referred to as a pollution control valve
  • FIGS. 2 and 3 illustrate a first exemplary embodiment 100 of a stuffing box in accordance with the present disclosure.
  • Stuffing box 100 has a fixed primary axis X100, and includes a base component 110 having a generally planar upper surface 121 and further comprising: • a lower base element 112 having a generally planar bottom surface 113 that is perpendicular to primary axis Xioo, a generally planar upper surface 119, a central opening 115L that is coaxial with primary axis Xioo, and a lower concave spherical surface 117L surrounding central opening 115L, with lower concave spherical surface 117L having a spherical radius Rs and a spherical centerpoint (i.e., center of sphere) CPs that is coincident with primary axis Xioo and proximal to (but not necessarily coincident with) upper surface 119; and
  • Bottom surface 113 of lower base element 112 of base component 110 is configured for mounting to a wellhead by any suitable means.
  • upper base element 114 may be of unitary construction, or it may comprise two or more sub-elements that are interconnectable along vertical interface surfaces and thus enabling removal or replacement of upper base element 114 while a polished rod is disposed within stuffing box 100.
  • Upper base element 114 is mountable to lower base element 112 (such as by means of bolts as generally indicated by reference number 111) such that:
  • lower and upper concave spherical surfaces 117L and 117U form a combined concave spherical surface having a spherical radius Rs and corresponding to the spherical surface of a sphere of which an upper portion and a lower portion have been horizontally truncated.
  • Stuffing box 100 further includes an upper component 120 having an upper end 120U and a lower end 120L, and comprising: • a barrel section 130 generally similar to barrel section 20 of prior art stuffing box 50, with a lower section 132, an upper section 134, and a top cap 136 (corresponding, respectively, to lower section 22, upper section 24, and top cap 26 of prior art stuffing box 50); and
  • a lower section 140 having: o an upper portion 144 corresponding to upper portion 24 of barrel section 20 of prior art stuffing box 50, with upper portion 144 being configured for connection to lower section 132 of barrel section 130 (in essentially the same way that stem section 14 of prior art stuffing box 50 connects to lower section 22 of barrel section 20 of prior art stuffing box 50); and o a lower portion 142 defining a convex spherical surface 145 having spherical radius Rs and a spherical centerpoint, such that spherical surface 145 is matingly engageable with and spherically rotatable within and relative to the combined concave spherical surface formed by upper and lower concave spherical surfaces 117U and 117L of base component 110, with the spherical centerpoint of convex spherical surface 145 coinciding with spherical centerpoint CPs of lower concave spherical surface 117L; such that the assembled base component 110
  • base component 110 is provided with seal means (such as an O-ring) 114 for containment of fluids and wellbore pressure.
  • seal means such as an O-ring
  • a central bore 155 having a central bore axis X155 extends throughout the length of upper component 120 of stuffing box 100, for receiving polished rod 40 (and associated packing material 30 and packing retainers 32 as shown in FIG. 1 with respect to prior art stuffing box 50).
  • central bore axis X155 will pass through spherical centerpoint CPs, as will axes X40 and Xioo.
  • central bore axis X155 is vertical (as shown by way of example in FIG. 2), central bore axis X155 will coincide with primary axis X100 of stuffing box 100.
  • axes X40, X100, and X155 would be coincident (and vertical).
  • FIG. 3 This scenario is illustrated in FIG. 3, in which central bore axis X155 is shown offset from primary axis X100 by an offset angle A.
  • polished rod axis X40 is shown coincident with central bore axis X155, which would be the case if angular misalignment arose before the packing material 30 disposed within central bore 155 experienced appreciable wear. If appreciable wear or other deterioration of the packing material is already present or later occurs, polished rod axis X40 would tend to be slightly tilted relative to central bore axis X155 due to packing deformation caused by induced lateral loads applied via polished rod 40.
  • polished rod 40 would still induce a lateral load component acting on the packing material due to the slight tilting of polished rod axis X40 relative to central bore axis X155.
  • upper component 120 of stuffing box 100 can be readily pivoted to facilitate installation of polished rod 40 within central bore 155 without resulting in polished rod 40 exerting significant if any lateral forces on the packing material as a consequence of the angular misalignment of polished rod 40 caused by the incorrect positioning of the pump jack.
  • FIG. 4 illustrates a second exemplary embodiment 200 of a stuffing box in accordance with the present disclosure.
  • Stuffing box 200 has an upper component 220 similar to upper component 120 of stuffing box 100 shown in FIGS. 2 and 3, and a base component 210 having an upper portion 212 similar to upper portion 112 of stuffing box 100.
  • the lower portion of base component 210 of stuffing box 200 is configured with a standard API tapered- thread “pin” end 214 for mounting to a wellhead (instead of a flange mount as in stuffing box 100).
  • any form of the word “comprise” is to be understood in its non-limiting sense to mean that any element or feature following such word is included, but elements or features not specifically mentioned are not excluded.
  • a reference to an element or feature by the indefinite article “a” does not exclude the possibility that more than one such element or feature is present, unless the context clearly requires that there be one and only one such element or feature.
  • connection any use herein of any form of the terms “connect”, “mount”, “attach”, or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the subject elements, and may also include indirect interaction between the elements such as through secondary or intermediary structure.
  • Relational and conformational terms such as “perpendicular”, “parallel”, “horizontal”, “vertical”, “planar”, “coincident”, “coaxial”, “axi symmetric”, “cylindrical”, and “spherical” are not intended to denote or require absolute mathematical or geometrical precision. Accordingly, such terms are to be understood as denoting or requiring substantial precision only (e.g., “substantially planar”) unless the context clearly requires otherwise.
  • any reference herein to an element as being “generally cylindrical” is intended to denote that the element in question would appear substantially cylindrical in transverse cross-section, although the cross-sectional configuration of the element might vary along its length.
  • any reference herein to an element being “axisymmetric” or “generally axisymmetric” is intended to denote that the element in question would appear substantially axisymmetric in transverse cross-section, although the cross-sectional configuration of the element might vary along its length.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

Un presse-étoupe à auto-alignement comprend un composant supérieur ayant un trou traversant central et une partie inférieure définissant une surface sphérique convexe, qui peut venir en prise par accouplement avec une surface sphérique concave formée autour d'une ouverture centrale dans un composant inférieur du presse-étoupe, de telle sorte que le composant supérieur peut pivoter librement par rapport au composant inférieur autour de l'un quelconque de nombreux axes de pivotement horizontaux ou inclinés possibles passant à travers le point central sphérique de la surface sphérique concave, dans une plage de pivotement angulaire définie. Lorsqu'une tige polie est poussée dans l'alésage traversant central au niveau d'un décalage angulaire dans la plage de pivotement angulaire définie, le désalignement angulaire amènera le composant supérieur à pivoter par rapport au composant inférieur pour amener la tige polie en alignement axial avec l'alésage traversant central.
PCT/CA2023/051369 2022-10-25 2023-10-14 Presse-étoupe à auto-alignement Ceased WO2024086917A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263419111P 2022-10-25 2022-10-25
US63/419,111 2022-10-25

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WO2024086917A1 true WO2024086917A1 (fr) 2024-05-02

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Publication number Priority date Publication date Assignee Title
US1529874A (en) * 1923-07-06 1925-03-17 Edward A Culbertson Oil-well apparatus
US3887196A (en) * 1973-10-09 1975-06-03 William Neil Renfrow Self aligning stuffing box
US5112140A (en) * 1988-11-17 1992-05-12 Dmitry Cherny Seal assembly for reciprocating members
RU2149977C1 (ru) * 1998-06-16 2000-05-27 Волох Олег Александрович Самоустанавливающийся устьевой сальник
US20010032952A1 (en) * 2000-01-14 2001-10-25 Ruben Lah Floating stuffing box assembly
US20030127220A1 (en) * 2002-01-04 2003-07-10 Farquharson Keith D. Wellhead stuffing box support assembly
CN2621215Y (zh) * 2003-05-29 2004-06-23 崔作福 锥形盘根盒
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CN2866801Y (zh) * 2006-03-08 2007-02-07 苑洪君 随动旋转调偏防喷密封井口装置
CN201137477Y (zh) * 2008-01-03 2008-10-22 濮阳市双发实业有限责任公司 复合式光杆密封器
CN201351474Y (zh) * 2009-02-13 2009-11-25 大庆市德源物资贸易有限公司 复式多功能盘根盒
CN201416407Y (zh) * 2009-04-30 2010-03-03 黄玉存 节能型多级密封防喷盒
CN203702066U (zh) * 2014-03-10 2014-07-09 中国石油天然气股份有限公司 自动全调心套装套取式盘根盒
CN105952409A (zh) * 2016-07-11 2016-09-21 中国石油化工股份有限公司华东油气分公司泰州采油厂 一种液压式井口光杆盘根盒自紧装置
WO2019079447A1 (fr) * 2017-10-17 2019-04-25 Seaboard International, Inc. Clapet anti-retour pour presse-étoupe
CN209704523U (zh) * 2019-04-04 2019-11-29 山东四通石油技术开发有限公司 一种可调心抽油井光杆密封器

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1529874A (en) * 1923-07-06 1925-03-17 Edward A Culbertson Oil-well apparatus
US3887196A (en) * 1973-10-09 1975-06-03 William Neil Renfrow Self aligning stuffing box
US5112140A (en) * 1988-11-17 1992-05-12 Dmitry Cherny Seal assembly for reciprocating members
RU2149977C1 (ru) * 1998-06-16 2000-05-27 Волох Олег Александрович Самоустанавливающийся устьевой сальник
US20010032952A1 (en) * 2000-01-14 2001-10-25 Ruben Lah Floating stuffing box assembly
US20030127220A1 (en) * 2002-01-04 2003-07-10 Farquharson Keith D. Wellhead stuffing box support assembly
CN2621215Y (zh) * 2003-05-29 2004-06-23 崔作福 锥形盘根盒
RU2005125154A (ru) * 2005-08-08 2006-01-10 Валентин Павлович Рылов (RU) Шаровый шарнир устьевого сальника
RU50590U1 (ru) * 2005-08-08 2006-01-20 Общество с ограниченной ответственностью производственно-коммерческая фирма "ТехноВек" Противовыбросовый устьевой сальник
CN2866801Y (zh) * 2006-03-08 2007-02-07 苑洪君 随动旋转调偏防喷密封井口装置
CN201137477Y (zh) * 2008-01-03 2008-10-22 濮阳市双发实业有限责任公司 复合式光杆密封器
CN201351474Y (zh) * 2009-02-13 2009-11-25 大庆市德源物资贸易有限公司 复式多功能盘根盒
CN201416407Y (zh) * 2009-04-30 2010-03-03 黄玉存 节能型多级密封防喷盒
CN203702066U (zh) * 2014-03-10 2014-07-09 中国石油天然气股份有限公司 自动全调心套装套取式盘根盒
CN105952409A (zh) * 2016-07-11 2016-09-21 中国石油化工股份有限公司华东油气分公司泰州采油厂 一种液压式井口光杆盘根盒自紧装置
WO2019079447A1 (fr) * 2017-10-17 2019-04-25 Seaboard International, Inc. Clapet anti-retour pour presse-étoupe
CN209704523U (zh) * 2019-04-04 2019-11-29 山东四通石油技术开发有限公司 一种可调心抽油井光杆密封器

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