EP2986813B1 - Verankerungsringanordnung - Google Patents

Verankerungsringanordnung Download PDF

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Publication number
EP2986813B1
EP2986813B1 EP14718710.8A EP14718710A EP2986813B1 EP 2986813 B1 EP2986813 B1 EP 2986813B1 EP 14718710 A EP14718710 A EP 14718710A EP 2986813 B1 EP2986813 B1 EP 2986813B1
Authority
EP
European Patent Office
Prior art keywords
housing
slips
slip
anchor ring
mandrel
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.)
Not-in-force
Application number
EP14718710.8A
Other languages
English (en)
French (fr)
Other versions
EP2986813A2 (de
Inventor
Mike Allen
David Matthew HARE
Christopher George BARNES
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.)
Reactive Downhole Tools Ltd
Original Assignee
Reactive Downhole Tools Ltd
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 Reactive Downhole Tools Ltd filed Critical Reactive Downhole Tools Ltd
Publication of EP2986813A2 publication Critical patent/EP2986813A2/de
Application granted granted Critical
Publication of EP2986813B1 publication Critical patent/EP2986813B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/127—Packers; Plugs with inflatable sleeve
    • E21B33/1277—Packers; Plugs with inflatable sleeve characterised by the construction or fixation of the sleeve
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
    • E21B33/1216—Anti-extrusion means, e.g. means to prevent cold flow of rubber packing
    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing

Definitions

  • the present invention relates to an anchor ring assembly for anchoring to a mandrel, for example to provide end support to seal, such as a packer for providing a seal in a wellbore annulus.
  • a mandrel such as a tubular body
  • annular seals are frequently employed which are mounted on a mandrel and function to extend radially outwardly from the mandrel to engage a bore wall, thus sealing the annulus between the mandrel and bore wall.
  • a seal is often referred to as a packer.
  • packers or seals in the oil and gas industry may be activated in a number of ways to be extended radially outwardly, for example by being axially compressed, by swelling, by inflation or the like.
  • the sealing component is located on a mandrel against metal end rings.
  • Such end rings are located at one or both axial ends of a sealing body, and may be secured to the mandrel by welding, via set screws or the like.
  • the end rings may anchor a sealing component to the mandrel. Additionally, such end rings may also function to prevent unwanted axial deformation of the sealing component, for example due to extrusion when exposed to a pressure differential, which might otherwise compromise the integrity of any established seal. This may be of particular importance in swellable seal designs, wherein the end rings function to prevent or minimise axial swelling, such that the swelling of the seal may be restricted primarily to the radial direction.
  • end rings Of critical importance in the design of end rings is their ability to provide a sufficient anchor to resist any displacing forces which might be experienced, and in some instances a poorly anchored end ring may result in failure of any associated seal.
  • US Patent application US 4 407 514 describes a packing support assembly which is sleeved about a well casing.
  • the support assembly comprises a support ring which is sleeved about the casing and secured thereto by a gripping means in the form of a plurality of clamping segments.
  • the clamping segments include serrated surfaces adapted to grip the external wall of the casing. Retaining screws secure the clamping segments to the support ring and hold the clamping segments in an unactivated position. To activate, the clamping segments are wedged inwardly to grip the casing by a plurality of activating pins which are threadably received into the bottom of the support ring.
  • the support ring is provided with an internal wedging surface which is slidably engagable with cooperating wedging surfaces on the exterior of the clamping segments upon rotation of the activating pins.
  • the gripping force is adjustable as determined by the degree and method of turning the activating pins.
  • the upper annular edge of the support ring is configured to support, for example an annular packer.
  • US patent application US 5 706 894 describes a self-energising device for engagement of cylindrical members about the outside diameter, so that downhole tools may be positioned longitudinally along said cylindrical member.
  • a generally cylindrical outer ring is detachably engaged with a generally cylindrical inner ring. Once the inner ring is detached from the outer ring the inner ring snaps into position by a spring clamping force exerted between the pipe and inner ring. Relative axial motion of the outer ring with respect to the inner ring automatically energizes the inner ring inward providing the high clamping force required to set the self-energising stop collar in its final position.
  • an anchor ring assembly according to claim 1.
  • the anchor ring assembly may be mounted on a mandrel and located in a desired position, with the activator members then adjusted relative to the housing to extend the slips radially inwardly to engage and grip the outer surface of the mandrel, thus anchoring or locking the anchor ring assembly to the mandrel.
  • the anchor ring assembly may be used in various applications.
  • the anchor ring assembly may be for use in defining a no-go profile on a mandrel.
  • the anchor ring assembly may define or function as an end ring for a seal element, such as an annular seal element, swellable seal element, axially compressible seal element, cup seal element and/or the like.
  • the anchor ring assembly may be configured to resist axially applied forces, such as axial pressure forces established by exposure to a pressure differential across a seal element. Such resistance to axial forces may permit the anchor ring assembly to provide support to assist the seal element to resist extrusion.
  • the anchor ring assembly may be configured to provide support to a seal element.
  • the anchor ring assembly may be configured to secure a seal element on or relative to a mandrel.
  • the anchor ring assembly may be suitable for use in securing to a mandrel in the form of a tubular, such as an oilfield tubular, for example a casing tubular, liner tubular, production tubular, tool sleeve or the like.
  • a tubular such as an oilfield tubular, for example a casing tubular, liner tubular, production tubular, tool sleeve or the like.
  • the activator members may comprise activator screws threadedly engaged with the housing to permit adjustment to extend the respective slips.
  • a single activator member may be provided for each slip. In other embodiments one slip may be associated with multiple activator members.
  • the activator members may be configured to engage respective rear faces of the slips.
  • An activator member may be configured to abut a respective slip. In such an arrangement adjustment of an activator member relative to the housing may function to extend an associated slip.
  • an activator member may be secured to a respective slip. Such an arrangement may permit the activator member to be adjusted relative to the housing to permit both extension and retraction of the associated slip.
  • An activator member may be configured to engage a respective slip generally centrally thereof.
  • an activator member may be configured to engage a respective slip at an axial and/or circumferential central region of said slip.
  • Engagement of an activator member generally centrally of a respective slip may permit a degree of self-adjustment of said slip, for example to self-align with an outer surface of a mandrel.
  • engagement of an activator member generally centrally of an associated slip may permit said slip to pivot relative to the housing. Such pivoting may be possible in multiple directions. Such an arrangement may provide a self aligning function of the slips.
  • One or more slips may define an engagement profile on a rear surface thereof and configured to be engaged by a respective activator member.
  • an engagement profile may comprise a recess, dimple, blind hole, channel or the like.
  • One or more slips may comprise a gripping profile on inwardly facing surfaces thereof for use in gripping an outer surface of a mandrel.
  • a gripping profile may assist to increase a connection force between the anchor ring assembly and a mandrel.
  • the gripping profile may be defined by any suitable structure, such as by individual teeth or ribs, by a surface roughness, by a knurled profile, by use of inserted material such as a carbine or the like.
  • One or more slips may comprise first and second sets of gripping teeth. Said sets of gripping teeth may be orientated in opposing directions. Such an arrangement may permit the first set of gripping teeth to preferentially resist forces applied in one direction, such as one axial direction, and the second set of gripping teeth to preferentially resist forces applied in an opposite direction, such as an opposite axial direction.
  • the first set of gripping teeth may be located on one axial side of a slip, and the second set of gripping teeth may be located on an opposite axial side of the slip.
  • One or more slips may facilitate an increase in an engagement area between the anchor ring assembly and a mandrel, which may permit a more robust connection to be achieved. Further, the use of slips which are extended to engage the outer surface of the mandrel may eliminate or minimise the requirement to alter the form of the mandrel to accommodate an anchor ring assembly.
  • One or more slips may be profiled to correspond to a profile of a mandrel.
  • one or more slips may be generally curved to permit engagement with a cylindrical mandrel.
  • One or more slips may be curved to define a circumferential segment.
  • At least two, and in some embodiments all slips may be arranged such that circumferential ends thereof may be positioned generally adjacent to each other. This arrangement may maximise the total circumferential slip surface area which may engage a mandrel, thus permitting a more robust connection to be achieved.
  • the anchor ring assembly may comprise a plurality of spacer ribs circumferentially distributed around the through bore of the housing, wherein adjacent slips are separated by a respective spacer rib.
  • Each spacer rib may extend generally axially relative to the housing. Circumferential ends of the slips may be positioned adjacent respective spacer ribs.
  • One or more spacer ribs may be integrally formed with the housing.
  • One or more spacer ribs may be separately formed and secured to the housing, for example via screws or the like.
  • Adjacent spacer ribs may define a pocket therebetween for receiving a respective slip.
  • Each spacer rib may define tapered side faces, wherein the circumferential faces of each slip may define corresponding tapered faces.
  • Such an arrangement may facilitate radial extension and retraction of the slips, with minimal interference from the spacer ribs.
  • tapered faces of the slips and spacer ribs may permit each slip to be appropriately guided into the circumferential groove of the housing upon retraction of said slips.
  • At least two circumferentially adjacent spacer ribs may secure a slip positioned therebetween. At least two circumferentially adjacent spacer ribs may define a limit of radial movement, such as inward radial movement, of a slip positioned therebetween. In one embodiment at least two circumferentially adjacent ribs may define a minimum circumferential separation distance which is smaller than a circumferential dimension of a slip positioned therebetween. At least two circumferentially adjacent ribs may define a minimum circumferential separation distance which is smaller than a maximum circumferential dimension of a slip positioned therebetween. In such an arrangement, once the slip is interposed between adjacent ribs, said ribs will prevent said slip from being fully radially removed from the anchor ring assembly.
  • At least two circumferentially adjacent ribs may collectively define a retaining profile configured to retain a slip therebetween.
  • the anchor ring assembly may comprise a retaining arrangement configured to retain one or more slips mounted within the housing.
  • the retaining arrangement may be configured to retain all slips within the housing.
  • the retaining arrangement may be configured to apply a retaining force to one or more slips to retain said slips within the housing. Extension of one or more slips radially inwardly may be achieved against this retaining force.
  • the retaining arrangement may be configured to bias one or more slips towards a retracted configuration. In such an arrangement adjustment of one or more activator members in a direction to extend the associated one or more slips may act against the bias of the retaining arrangement. Further, in such an arrangement adjustment of one or more activator members in a direction to retract the associated one or more slips may permit the bias of the retaining arrangement to cause said slips to be retracted.
  • the retaining arrangement may be mounted radially inwardly of the slips.
  • one or more slips may define a groove formed in an inner surface thereof for accommodating a retaining arrangement.
  • a plurality, for example all, slips may define a groove, wherein when the slips are mounted within the housing each individual groove is aligned to receive the retaining arrangement.
  • Such a collective groove may be generally circumferential. In some embodiments such a collective groove may be helical.
  • a groove provided in one or more slips for accommodating a retaining arrangement may define a groove width which is larger than the corresponding width of the retaining arrangement. Such an arrangement may permit a degree of relative motion between the slip or slips and the retaining arrangement, for example to permit compliance of the slip or slips during clamping against a mandrel.
  • the retaining arrangement may be configured to be mounted axially centrally of the slips. Such an arrangement may permit the slips to be self-aligning, for example to accommodate the profile of a mandrel. Such an arrangement may permit each slip to pivot about the retaining arrangement, which may provide a self-alignment function.
  • the retaining arrangement may comprise a single retaining element.
  • the retaining arrangement may comprise a spring member or element.
  • the retaining arrangement may define a split ring spring element configured to provide an outwardly directed retaining force.
  • At least one slip may define or comprise first and second gripping profiles, wherein a retaining arrangement is located between said first and second profiles.
  • the retaining arrangement may not interfere with the gripping function of the slips.
  • the annular housing may define a circumferential groove formed in an inner surface thereof, wherein said groove is configured to accommodate one or more slips.
  • the circumferential groove may be circumferentially continuous.
  • the circumferential groove may be circumferentially discontinuous.
  • multiple discrete grooves or recesses may be provided within the housing. Such discrete grooves or recesses may define a plurality of circumferentially arranged pockets each for receiving or accommodating one or more slips.
  • the circumferential groove of the housing may be profiled, wherein at least one slip defines a corresponding profile to permit appropriate fitting of the slips within the groove.
  • the circumferential groove of the housing may be defined between opposing axial faces. Opposing axial ends of at least one slip may be profiled to correspond with the axial faces of the housing groove.
  • At least one axial face of the groove may extend generally perpendicular relative to a central axis of the housing. Such an axial face may define an annular shoulder. Such an axial face may permit load transference between the housing and at least one slip.
  • At least one axial face of the groove may be tapered. That is, at least one axial face of the groove may be tapered or obliquely aligned relative to a central axis of the housing. At least one axial face of at least one slip may be tapered to correspond and engage the tapered axial face of the groove.
  • an axial load applied on the housing for example from an external component, such as a seal element, may be transmitted to at least one slip via the respective tapered faces, thus applying an inward radial force on said at least one slip.
  • Such an inward radial force may function to increase the gripping force of the slips against a mandrel. Accordingly, increasing axial load applied on the housing, for example from an external component, may result in the gripping force of the slips being increased.
  • the anchor ring assembly may automatically respond to changes in applied axial forces.
  • Opposing axial faces of the groove, and opposing axial faces of at least one slip may be tapered. Such an arrangement may permit an increase in gripping force to be achieved in the event of an axial load applied in opposite axial directions.
  • At least one axial end face of the housing may be configured to be engaged by an external component, such as a seal component or element. At least one axial end face of the housing may define a load surface, such as a load shoulder or the like. Such a load surface may be configured for transmission of force from an external component or environment into the anchor ring assembly.
  • At least one axial end face of the housing may be tapered relative to a central axis of the housing. Such a tapered surface may facilitate or assist with insertion of the anchor ring assembly, for example when mounted on a mandrel, into a bore, such as a well bore.
  • At least one axial end face of the housing may be generally perpendicular to central axis of housing.
  • At least one axial end face of the housing may be configured to be sealingly engaged with an external component, such as a sealing element.
  • At least one axial end face of the housing may be configured to be bonded to an external component, such as a seal component or element.
  • At least one axial end face of the housing may be configured to define a profile configured to permit engagement with a corresponding profile on an external component, such as a sealing element.
  • At least one axial end face of the housing may comprise an axial extension configured to engage an external component, such as a sealing element, for example a cup seal element.
  • the axial extension may increase a surface area of contact between an external component and the housing.
  • the axial extension may be configured to at least partially define a sealed surface between the housing and an external component.
  • the axial extension may be configured to at least partially define a bonded surface between the housing and an external component.
  • the anchor ring assembly may comprise a sealing arrangement configured to provide a seal with a mandrel.
  • the sealing arrangement may be configured to provide a seal between the housing and a mandrel.
  • the seal arrangement may comprise a mechanical seal, such as an o-ring seal or the like.
  • An inner surface of the housing may define a circumferential groove configured to accommodate a seal, such as an o-ring seal.
  • An inner surface of the housing may define multiple circumferential grooves configured to accommodate respective seals.
  • the sealing arrangement may be configured to provide a seal between the slips and a mandrel.
  • the slips may define one or more grooves configured to collectively accommodate a seal, such as an o-ring seal.
  • a retaining arrangement configured to retain the slips within the circumferential groove of the housing may also define a sealing arrangement configured to provide a seal against a mandrel.
  • the anchor ring assembly may comprise a sealing element extending from one axial end of the housing.
  • the sealing element may be configured for use in providing a seal in an annulus defined between a mandrel and an outer bore wall, such as an open drilled bore wall, the wall of a casing, pipeline or the like.
  • the anchor ring assembly, and in particular the annular housing may provide axial support to such a sealing element, for example to help resist extrusion of the sealing element when exposed to a pressure differential.
  • the sealing element may comprise an annular sealing element.
  • the sealing element may comprise a swellable material configured to swell upon exposure to an activator, such as oil and/or water.
  • an activator such as oil and/or water.
  • the anchor ring assembly, and in particular the housing when anchored to a mandrel via the slips, may function to restrict swelling of the swellable material in an axial direction. In this way, swelling may be achieved primarily in a radial direction to facilitate sealing between the mandrel and an outer bore wall.
  • the sealing element may comprise an axially compressible sealing element.
  • the anchor ring assembly, and in particular the housing when anchored to a mandrel via the slips, may define a reaction point against which such a compressible sealing element may be compressed.
  • the sealing element may comprise a cup seal sealing element.
  • One axial end of the cup sealing element may be engaged with the housing, for example sealingly engaged, and an opposite axial end of the cup sealing element may be free from support, so as to permit the seal element to function as a cup seal.
  • the sealing element may be bonded directly to a mandrel.
  • the sealing element may comprise:
  • the outer sealing material may be configured to establish a seal with a wall of a bore
  • the inner sealing material may be configured to establish a seal against a mandrel
  • the support sleeve may extend along the entire axial length of the sealing element. In some embodiments the support sleeve may extend along a partial axial length of the sealing element.
  • the support sleeve may be fixed to the anchor ring assembly, for example to the housing of the anchor ring assembly.
  • the anchor ring assembly according to the first aspect may be utilised in the method according to the second aspect.
  • a sealing assembly for use in providing a seal in an annulus between a mandrel and a bore wall, comprises:
  • the sealing assembly may comprise two annular housings located at opposite ends of the sealing element, wherein each annular housing accommodates slips for anchoring to a mandrel.
  • each annular housing accommodates slips for anchoring to a mandrel.
  • the sealing element may be supported at opposing ends.
  • the sealing assembly may comprise a single housing, such that the sealing element is supported at a single end.
  • the sealing element may comprise any suitable type of sealing element, such as a swellable sealing element, compressible sealing element, a cup sealing element or the like.
  • the housing may comprise an axial extension extending from one axial end face thereof to permit engagement with the sealing element.
  • the sealing assembly may include an anchor ring assembly according to the first aspect.
  • a sealing assembly comprises:
  • the activator may comprise water, oil, gas or the like.
  • a sealing assembly comprises:
  • the sealing assembly may be configured to be mounted on a mandrel, for example to be slipped on to one end of a mandrel.
  • the support member may comprise a metallic support member.
  • the support member may be generally cylindrical.
  • the support member may comprise one or more perforations through its wall structure.
  • the inner and outer sealing elements may engage each other via these perforations.
  • the inner and outer sealing elements may be integrated, for example continuous, via these perforations.
  • the sealing assembly may comprise one or more end rings.
  • the support member may be secured or at least engage at least one end ring.
  • the outer sealing element may engage an axial end face or surface of an end ring.
  • the inner sealing element may engage an axial end face or surface of an end ring.
  • the inner sealing element may engage an inner circumferential face of an end ring. Such an arrangement may permit the inner sealing element to also establish a seal between an end ring and a mandrel.
  • An end ring may be configured to be secured relative to the support member via one or more screws, such as set screws, grub screws or the like.
  • An end ring may comprise an anchor ring assembly according to the first aspect.
  • a sealing assembly for use in providing a seal in an annulus between a mandrel and a bore wall, comprises:
  • One axial end of the housing may include an axial extension configured to engage the cup sealing element.
  • the cup sealing element may be bonded to one axial end of the housing.
  • the sealing arrangement provided between the housing and a mandrel may comprise one or more mechanical seals, such as O-ring seals.
  • the sealing assembly may comprise an anchor ring assembly according to the first aspect.
  • FIG. 1 A perspective view of an anchor ring assembly, generally identified by reference numeral 10, is shown in Figure 1 , and a side view of the same assembly 10 is illustrated in Figure 2 .
  • the anchor ring assembly 10 is for use in anchoring to a mandrel 12, which is illustrated in Figure 2 in broken outline.
  • the mandrel 12 may comprise a tubular member, such as an oilfield tubular.
  • the anchor ring assembly 10 may have utility in multiple applications. In some of the examples below the assembly 10 is utilised to function as an end ring in a sealing assembly, such as a packer assembly.
  • the anchor ring assembly 10 includes an annular housing 14 which defines a throughbore 15 to permit the housing 14 to be mounted on the mandrel 12.
  • the assembly 10 further comprises a plurality of slips 16 (five in the embodiment shown) which are circumferentially arranged within a circumferential groove 18 formed in an inner surface of the housing 14, wherein the slips 16 are each located between circumferentially arranged spacer ribs 20 which are secured to the housing via screws 22, as also illustrated in Figure 3 which is a cross-sectional view through line 3-3 of Figure 2 .
  • Each rib 20 includes tapered side faces 24, and the circumferential end faces 26 of each slip 16 correspond such that the slips 16 may be permitted to be displaced radially inwardly without interference from the ribs 20.
  • the corresponding faces 24, 26 of the ribs 20 and slips 16 may function to align the slips 16 within the circumferential groove 18 of the housing 14 when moved towards a retracted position.
  • a plurality of activator members in the form of screws 28 extend from the outer surface of the housing 14 and engage the rear faces of the respective slips 16, as shown in Figure 4 which is a cross sectional view through line 4-4 of Figure 2 . Adjustment of the activator screws 28 relative to the housing 14 permits the slips 16 to be extended radially inwardly to grip the outer surface of the mandrel 12 and thus anchor the assembly 10 thereto.
  • a single activator screw 28 is provided for each slip 16, and each screw 28 engages the rear face of a slip 16 generally centrally thereof. This arrangement permits the slips 16 to pivot about the contact point with the screws 28 which assists with self-alignment of the slips 16 with the mandrel 12.
  • one axial end face 30 of the housing 14 is generally perpendicular to a central axis of the housing 14. As best illustrated in Figure 2 , such a perpendicular end face 30 defines an annular shoulder relative to the mandrel 12. This annular shoulder or face 30 may be used to support an adjacent external component, such as a sealing element for defining a seal between the mandrel 12 and a bore wall.
  • An opposite axial end face 32 of the housing 14 defines a tapered surface. This may facilitate insertion of the mandrel 12 and mounted anchor ring assembly 10 into a bore, for example to minimise snagging of the assembly 10 with any restrictions in such a bore.
  • Each slip 16 is generally arcuate or curved in form and includes first and second sets of gripping profiles in the form of sets of teeth 34, 36 which function to increase the anchoring force against the mandrel 12.
  • the first and second sets of gripping teeth 34, 36 are orientated in opposing directions, which permits the first set of gripping teeth 34 to preferentially resist forces applied in one axial direction, and the second set of gripping teeth 36 to preferentially resist forces applied in an opposite axial direction.
  • Each slip 16 includes a central groove 38 which are aligned when the slips 16 are mounted within the housing 14.
  • the grooves 38 are configured to receive a split ring spring member 40, as illustrated in Figures 1 and 4 , which functions to retain each slip 16 within the circumferential groove 18 of the housing 14. Further, the spring member 40 applies a biasing force against the slips 16 to bias said slips towards a retracted position, for example when the activator screws 28 are adjusted relative to the housing 14 to permit retraction of the slips 16.
  • the grooves 38 each are wider than the spring member 40 in the axial direction. Such an arrangement may permit a degree of relative movement therebetween.
  • FIG. 6 is a cross sectional view of the assembly 10 taken through line 6-6 of Figure 2 .
  • the circumferential groove 18 formed in the housing includes opposing tapered side faces 42.
  • each slip 16 includes corresponding tapered side faces 44.
  • an axial load applied on the housing 14, for example from an external component, such as a seal element may be transmitted to the slips 16 via the respective tapered faces 42, 44, thus applying an inward radial force on the slips 16.
  • Such an inward radial force may function to increase the gripping force of the slips 16 against the mandrel 12.
  • increasing axial load applied on the housing 14, for example from an external component may result in the gripping force of the slips 16 being increased.
  • the anchor ring assembly 10 may automatically respond to changes in applied axial forces.
  • a sealing assembly generally identified by reference numeral 50, includes an annular sealing element 52 which is bonded directly to the mandrel 12, and a pair of anchor ring assemblies 10, as described above, are located and anchored to the mandrel 12 at opposing ends of the sealing element 52.
  • the sealing element 52 may be composed of or include a swellable material, such as a swellable rubber, which swells when contacted by a suitable activator, such as oil and/or water.
  • the anchor ring assemblies 10 may function to provide axial support to the sealing element 52, for example to assist the sealing element 52 to resist extrusion, to restrict any axial swelling and the like. Further, the anchor ring assemblies 10 may protect the sealing element 52 while the mandrel 12 is run into a bore.
  • the sealing element 52 may first be bonded to the mandrel, and the anchor ring assemblies 10 then located in place.
  • the anchor ring assemblies 10 may be located on the mandrel and secured in place, with the sealing element 52 then located and bonded to the mandrel 12.
  • FIG. 8 An alternative embodiment of a sealing assembly, in this case generally identified by reference numeral 60, is illustrated in Figure 8 .
  • the sealing assembly 60 includes a sealing element 62 which is mounted about the mandrel 12. However, in this case the sealing element 62 is not bonded to the mandrel 12, but instead is simply slipped over the mandrel 62 and located in the desired position.
  • a pair of anchor ring assemblies 10, as described above, are mounted on the mandrel 12 at opposing ends of the sealing element.
  • the sealing element 62 in Figure 8 may include a swellable material.
  • the sealing element 62 is composed of a support sleeve 64, which may be of a metal construction, an outer swellable layer 66 mounted on an outer surface of the support sleeve 64, and an inner swellable layer 68 mounted on an inner surface of the support sleeve 64.
  • the outer layer 66 may swell to provide a seal between the support sleeve 64 and a bore wall
  • the inner layer 68 may swell to provide a seal between the support sleeve 64 and the mandrel 12.
  • the sleeve 64 may be perforated such that the outer and inner swellable layers 66, 68 may be integrated with each other through the perforations.
  • Anchor ring assembly 110 is similar to that assembly 10 first shown in Figure 1 and as such like features share like reference numerals, incremented by 100. Accordingly, the assembly 110 includes a housing 114 and a plurality of slips 116 arranged within a circumferential groove 118 formed in the inner surface of the housing 114. As in the embodiment first shown in Figure 1 , the slips 116 in the present embodiment may be extended by use of activator screws (not shown) to grip a mandrel (also not shown).
  • the housing 114 defines a pair of circumferential grooves 70, 72 on either side of the slips 116 which are configured to receive respective o-rings 74, 76. These o-rings 74, 76 permit a seal to be achieved between the housing 114 and a mandrel.
  • One end of the housing 114 includes an axial extension 78 which in the present embodiment is for use in engaging an end of a sealing element 80, which is shown in broken outline.
  • the sealing element 80 is bonded to the axial extension 78, thus achieving a seal therebetween.
  • the sealing element 80 defines a cup sealing element, having a proximal end 82 secured to the axial extension 78, as described above, and having a distal end (not illustrated) being free from support, such that a pressure differential across the sealing element 80 may act to extend the distal end against a bore wall, to establish and/or increase a seal therebetween.
  • the o-rings 74, 76 function to prevent leakage of fluid/pressure across the anchor ring assembly 110.
  • Anchor ring assembly 210 in accordance with an alternative embodiment of the present invention is shown in Figure 1 , and a side view of the same assembly 210 is illustrated in Figure 2 , shown mounted on a mandrel 212 (shown in broken outline).
  • Anchor ring assembly 210 is similar to assembly 10 first shown in Figure 1 , and as such like components share like reference numerals, incremented by 200.
  • the anchor ring assembly 210 includes an annular housing 214 which defines a throughbore 215 to permit the housing 214 to be mounted on the mandrel 212.
  • the assembly 210 further comprises a plurality of slips 216 (ten in this present embodiment) which are circumferentially arranged within a circumferential groove 218 formed in an inner surface of the housing 214.
  • the slips 216 are located between circumferentially arranged spacer ribs 220 which are secured to the housing via screws 222.
  • the ribs 220 function to hold or retain the slips 216 within the housing 214, while still permitting the slips to be moved radially.
  • additional retaining features such as split rings, are not necessarily required in the present embodiment.
  • a plurality of activator members in the form of screws 228 extend from the outer surface of the housing 214 and engage the rear faces of the respective slips 216, as shown in Figure 12 which is a cross sectional view through line 12-12 of Figure 10 . Adjustment of the activator screws 228 relative to the housing 214 permits the slips 216 to be extended radially inwardly to grip the outer surface of the mandrel 212 and thus anchor the assembly 210 thereto.
  • one axial end face 230 of the housing 214 is generally perpendicular to a central axis of the housing 214, and an opposite axial end face 232 of the housing 214 defines a tapered surface.
  • the slips 216 in the present embodiment define an arcuate inner surfaces which include a gripping profile in the form of teeth 35.
  • the teeth are arranged in a common direction.
  • FIG. 13 is an enlarged view of a portion of the anchor ring assembly 210 as shown in the section of Figure 12 , with a slip 216a removed from a pocket 90 defined between two circumferentially adjacent ribs 220a, 220b.
  • the ribs 220a, 22b are formed and arranged within the housing 214 to define a radially inner circumferential separation distance 92 which is smaller than the radially outer circumferential length 94 of the slip 216a.
  • the slip 216a will not be permitted to be removed, yet will be permitted to move radially within the housing to selectively grip and release a mandrel 212.
  • FIG. 14 of the drawings a sealing assembly, generally identified by reference numeral 300, in accordance with an embodiment of the present invention.
  • the assembly 300 is adapted to be slipped over a mandrel (not shown), and located in the desired position, thus providing a degree of freedom on where and when to apply the sealing assembly 300.
  • the assembly 300 includes a sealing component 302 which extends between opposing end rings 304, wherein one end ring is shown removed from the assembly 300 to reveal features of the sealing component 302.
  • the end rings 304 may function to secure the entire assembly 300 to a mandrel.
  • the sealing component 302 includes a support sleeve 308 which may be of a metal construction and which extends between the end rings 304.
  • An outer swellable seal layer 310 is mounted on an outer surface of the support sleeve 308, wherein the outer layer 310 is axially shorter than the support sleeve 308.
  • An inner swellable seal layer 312 is mounted on an inner surface of the support sleeve 308, wherein the inner layer 312 is axially longer than the support sleeve 308.
  • the outer layer 310 may swell to provide a seal between the support sleeve 308 and a bore wall
  • the inner layer 312 may swell to provide a seal between the support sleeve 308 and a mandrel, thus achieving a complete annular seal between the mandrel and bore wall.
  • the end rings 304 may be mounted relative to the sealing component 302 such that an end face 314 of the rings 304 abuts or engages the outer seal layer 310, whereas an inner surface of the ends rings 304 engages or abuts the support sleeve 308 and optionally the inner seal layer 312.
  • swelling of the inner layer 312 may function to establish a seal against the end rings 304, for example between the end rings 304 and a mandrel.
  • the support sleeve 308 and outer and inner seal layers 310, 312 may be of equal axial lengths.
  • the support sleeve 308 may be axially shorter then the inner and outer seal layers 310, 312.
  • the support sleeve 308 may be perforated, and the inner and outer seal layers 310, 312 may engage, for example be integrally formed, through the perforations.
  • FIG. 15 illustrates a sealing assembly, generally identified by reference numeral 320, in accordance with an alternative embodiment of the present invention, wherein the sealing assembly 320 is shown mounted on a mandrel 322, such as an oilfield tubular.
  • the mandrel 322 may form part of the sealing assembly 320.
  • the mandrel 322 may be provided in the form of a pup joint.
  • the mandrel 322 may include threaded connectors 328, 329 at opposing ends thereof.
  • Connector 328 may be a pin type threaded connector, whereas connector 329 may be a box type threaded connector.
  • the sealing assembly 320 includes a swellable seal element 324 which is directly bonded to the outer surface of the mandrel 322. Such bonding may be achieved by use of an adhesive. Such bonding may be achieved by mounting the swellable material of the seal element 324 on the mandrel, and then vulcanising the material to cause the element 324 to become bonded to the mandrel 322.
  • the sealing assembly 320 further comprises a pair of end rings 326 mounted at opposite ends of the sealing element 324, and may be used to protect and axially support the seal element 324.
  • the anchor ring assemblies may be for use in other applications beyond providing support to a sealing element or component, such as in establishing a no-go on a mandrel.
  • the ribs may be integrally formed with the housing.

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

Claims (14)

  1. Verankerungsringanordnung (10) zum Verankern an einem Dorn (12), umfassend:
    ein ringförmiges Gehäuse (14), das durch ein Bohrloch definiert ist, um ein Anbringen an einem Dorn (12) zu ermöglichen;
    eine Vielzahl von Keilen (16), die in Umfangsrichtung um das Bohrloch (15) des Gehäuses (14) angeordnet sind; und
    gekennzeichnet durch
    eine Vielzahl von Aktivierungselementen (28), die sich von einer Außenfläche des Gehäuses (14) radial nach innen erstrecken, um die Keile (16) in Eingriff zu nehmen, wobei die Aktivierungselemente (28) in Bezug auf das Gehäuse (14) radial nach innen verstellbar sind, um die Keile (16) radial nach innen zu erweitern, um einen Dorn (12) in Eingriff zu nehmen und zu greifen.
  2. Verankerungsringanordnung nach Anspruch 1, wobei die Aktivierungselemente (28) Aktivierungsschrauben (28) umfassen, die gewindemäßig mit dem Gehäuse (16) in Eingriff sind, um eine Verstellung zwecks Erweiterung der jeweiligen Keile zu ermöglichen.
  3. Verankerungsringanordnung nach Anspruch 1 oder 2, umfassend eines oder mehreres aus Folgendem:
    wobei für jeden Keil ein einziges Aktivierungselement (28) vorgesehen ist;
    wobei das Aktivierungselement (28) jeweils die Rückseiten der Keile (16) in Eingriff nimmt; und
    wobei ein Aktivierungselement (28) konfiguriert ist, einen jeweiligen Keil (16) im Allgemeinen in dessen Mitte in Eingriff zu nehmen.
  4. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, umfassend eines oder mehreres von Folgendem:
    wobei der zumindest ein Keil (16) ein Eingriffsprofil auf seiner rückwärtigen Fläche definiert, das ein jeweiliges Aktivierungselement (28) in Eingriff nehmen soll;
    wobei der zumindest ein Keil (16) ein Greifprofil auf einer seiner nach innen gewandten Oberflächen zur Verwendung beim Greifen einer Außenfläche eines Dorns (12) umfasst;
    wobei der zumindest ein Keil (16) Greifzähne (34, 35, 36) umfasst;
    wobei der zumindest ein Keil (16) einen ersten und einen zweiten Satz Greifzähne (34, 36) umfasst;
    wobei der erste und der zweite Satz Greifzähne (34, 36) in entgegengesetzte Richtungen ausgerichtet sind; und
    wobei der zumindest ein Keil (16) ein gekrümmtes Profil definiert.
  5. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, umfassend eine Vielzahl von Abstandsrippen (20), die in Umfangsrichtung um das Bohrloch (15) des Gehäuses (14) angeordnet sind, wobei benachbarte Keile (16) jeweils durch eine Abstandsrippe (20) getrennt sind.
  6. Verankerungsringanordnung nach Anspruch 5, umfassend eines oder mehreres von Folgendem:
    wobei jede Abstandsrippe (20) sich im Allgemeinen axial zum Gehäuse (14) erstreckt;
    wobei benachbarte Abstandsrippen (20) eine Tasche zwischen sich zum Aufnehmen eines jeweiligen Keils (16) definieren;
    wobei jede Abstandsrippe (20) verjüngte Stirnseiten definiert, wobei die Umfangsseiten jedes Keils entsprechende verjüngte Seiten definieren;
    wobei zumindest zwei in Umfangsrichtung benachbarte Abstandsrippen (20) innerhalb der Anordnung einen Keil (16) zwischen sich positioniert halten;
    wobei zumindest zwei in Umfangsrichtung benachbarte Abstandsrippen (20) eine Grenze der radialen Bewegung eines zwischen diesen positionierten Keils (16) definieren;
    wobei zumindest zwei in Umfangsrichtung benachbarte Rippen (20) eine Mindesttrenndistanz in Umfangsrichtung definieren, die geringer ist als eine Umfangsabmessung eines zwischen diesen positionierten Keils (16);
    wobei zumindest zwei in Umfangsrichtung benachbarte Rippen (20) eine Mindesttrenndistanz in Umfangsrichtung definieren, die geringer ist als eine maximale Umfangsabmessung eines zwischen diesen positionierten Keils (16);
    wobei zumindest zwei in Umfangsrichtung benachbarte Rippen (20) gemeinsam ein Halteprofil definieren, das konfiguriert ist, einen Keil (16) zwischen diesen zu halten.
  7. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, umfassend eine Halteanordnung, die konfiguriert ist, einen oder mehrere Keile (16) zu halten, die innerhalb des Gehäuses (14) angebracht sind.
  8. Verankerungsringanordnung nach Anspruch 7, umfassend eines oder mehreres von Folgendem:
    wobei die Halteanordnung konfiguriert ist, eine Haltekraft an einen oder mehrere Keile (16) anzulegen, um die Keile (16) innerhalb des Gehäuses (14) zu halten;
    wobei die Halteanordnung einen oder mehrere Keile (16) in eine zurückgezogene Konfiguration vorspannt;
    wobei die Halteanordnung von den Keilen (16) aus radial innen angebracht ist;
    wobei ein oder mehrere Keile (16) eine Nut (38) definieren, die in einer Innenfläche davon zum Beherbergen einer Halteanordnung ausgebildet ist;
    wobei jeder Keil (16) eine Nut (38) definiert, wobei, wenn die Keile (16) innerhalb des Gehäuses angebracht sind, jede einzelne Nut (38) so ausgerichtet ist, dass sie die Halteanordnung aufnimmt;
    wobei die Halteanordnung axial mittig zu den Keilen (16) angeordnet ist;
    wobei die Halteanordnung ein Federelement oder -glied umfasst, wie ein Spaltringfederglied;
    wobei zumindest ein Keil (16) ein erstes und ein zweites Greifprofil umfasst, die voneinander axial getrennt sind, wobei sich zwischen dem ersten und dem zweiten Profil eine Halteanordnung befindet.
  9. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, wobei das ringförmige Gehäuse (14) eine Umfangsnut (18) definiert, die in einer seiner Innenflächen angeordnet ist, wobei die Nut (18) konfiguriert ist, einen oder mehrere Keile (16) zu beherbergen.
  10. Verankerungsringanordnung nach Anspruch 9, umfassend eines oder mehreres von Folgendem:
    wobei die Umfangsnut (18) mit einem Profil versehen ist,
    wobei zumindest ein Keil (16) ein entsprechendes Profil definiert, um ein entsprechendes Einpassen der Keile (16) in die Nut (18) zu ermöglichen;
    wobei zumindest eine axiale Seite der Nut (18) verjüngt ist und zumindest eine axiale Seite zumindest eines Keils (16) so verjüngt ist, dass sie der verjüngten axialen Seite der Nut (18) entspricht und diese in Eingriff nimmt; und
    wobei entgegengesetzte axiale Seiten der Nut (18) und entgegengesetzte axiale Seiten des zumindest einen Keils (16) verjüngt sind.
  11. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, umfassend eines oder mehreres von Folgendem:
    wobei zumindest eine axiale Stirnseite des Gehäuses (14) eine Lastfläche definiert;
    wobei zumindest eine axiale Stirnseite des Gehäuses (14) in Bezug auf eine Mittelachse des Gehäuses (14) verjüngt ist; und
    wobei zumindest eine axiale Stirnseite des Gehäuses eine axiale Erweiterung umfasst, die konfiguriert ist, eine externe Komponente, wie ein Verschlussglied, in Eingriff zu nehmen.
  12. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, umfassend eine Verschlussanordnung, die konfiguriert ist, einen Verschluss mit einem Dorn (12) bereitzustellen.
  13. Verankerungsringanordnung nach einem der vorstehenden Ansprüche, umfassend eine Verschlussanordnung, die sich von einem axialen Ende des Gehäuses (14) aus erstreckt.
  14. Verfahren zur Verankerung an einem Dorn, umfassend:
    Anbringen einer Verankerungsringanordnung (10) an einem Dorn (12), wobei die Verankerungsringanordnung (10) ein ringförmiges Gehäuse (14) und eine Vielzahl von Keilen (16) umfasst, die in Umfangsrichtung innerhalb eines Bohrlochs des Gehäuses (14) angeordnet sind;
    gekennzeichnet durch
    das Verstellen einer Vielzahl von Aktivierungselementen (28), die sich von einer Außenfläche des Gehäuses (14) radial nach innen erstrecken, radial nach innen, um die jeweiligen Keile (16) in Eingriff zu nehmen, um die Keile (16) radial nach innen zu erweitern, um den Dorn (12) in Eingriff zu nehmen und zu greifen.
EP14718710.8A 2013-04-17 2014-04-17 Verankerungsringanordnung Not-in-force EP2986813B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1306968.7A GB2513152A (en) 2013-04-17 2013-04-17 Anchor ring assembly
PCT/GB2014/051210 WO2014170685A2 (en) 2013-04-17 2014-04-17 Anchor ring assembly

Publications (2)

Publication Number Publication Date
EP2986813A2 EP2986813A2 (de) 2016-02-24
EP2986813B1 true EP2986813B1 (de) 2018-01-17

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ID=48537384

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Application Number Title Priority Date Filing Date
EP14718710.8A Not-in-force EP2986813B1 (de) 2013-04-17 2014-04-17 Verankerungsringanordnung

Country Status (6)

Country Link
US (1) US20160076324A1 (de)
EP (1) EP2986813B1 (de)
CA (1) CA2909526A1 (de)
GB (1) GB2513152A (de)
NO (1) NO2986813T3 (de)
WO (1) WO2014170685A2 (de)

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EP3879066B1 (de) * 2020-03-11 2022-11-09 Downhole Products Limited Schlanker anschlagbund mit massivem nockenring
WO2023091371A1 (en) * 2021-11-17 2023-05-25 Schlumberger Technology Corporation Completion locator assembly

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GB201306195D0 (en) * 2013-04-05 2013-05-22 Rubberatkins Ltd Downhole seal
GB2512506B (en) * 2014-05-02 2015-07-08 Meta Downhole Ltd Morphable anchor
CN109751010B (zh) * 2017-11-06 2021-05-11 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 封隔器
EP3983639B1 (de) 2019-06-14 2024-05-01 Services Pétroliers Schlumberger Lastanker mit dichtung
US11952867B2 (en) 2021-03-18 2024-04-09 ProTorque Connection Technologies, Ltd. Overhead rotating safety tether ring

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Publication number Priority date Publication date Assignee Title
EP3879066B1 (de) * 2020-03-11 2022-11-09 Downhole Products Limited Schlanker anschlagbund mit massivem nockenring
WO2023091371A1 (en) * 2021-11-17 2023-05-25 Schlumberger Technology Corporation Completion locator assembly

Also Published As

Publication number Publication date
CA2909526A1 (en) 2014-10-23
WO2014170685A2 (en) 2014-10-23
WO2014170685A3 (en) 2015-09-24
GB201306968D0 (en) 2013-05-29
US20160076324A1 (en) 2016-03-17
GB2513152A (en) 2014-10-22
NO2986813T3 (de) 2018-06-16
EP2986813A2 (de) 2016-02-24

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