EP0213798B1 - Vorrichtung zum Zurückziehen eines Packers - Google Patents

Vorrichtung zum Zurückziehen eines Packers Download PDF

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Publication number
EP0213798B1
EP0213798B1 EP86306065A EP86306065A EP0213798B1 EP 0213798 B1 EP0213798 B1 EP 0213798B1 EP 86306065 A EP86306065 A EP 86306065A EP 86306065 A EP86306065 A EP 86306065A EP 0213798 B1 EP0213798 B1 EP 0213798B1
Authority
EP
European Patent Office
Prior art keywords
packer
retaining member
retrieval assembly
bore
assembly
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.)
Expired - Lifetime
Application number
EP86306065A
Other languages
English (en)
French (fr)
Other versions
EP0213798A3 (en
EP0213798A2 (de
Inventor
Colin Mackenzie
Arthur Mcleod
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.)
Tri State Oil Tool UK Ltd
Original Assignee
Tri State Oil Tool UK 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 Tri State Oil Tool UK Ltd filed Critical Tri State Oil Tool UK Ltd
Publication of EP0213798A2 publication Critical patent/EP0213798A2/de
Publication of EP0213798A3 publication Critical patent/EP0213798A3/en
Application granted granted Critical
Publication of EP0213798B1 publication Critical patent/EP0213798B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
    • 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
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means

Definitions

  • This invention relates to a packer retrieval assembly for the retrieval of packers from oil well bores.
  • Oil well bores are provided with packers which fit within the well bore and may, for example, be provided with a valve or some other assembly.
  • the packers are cylindrical in shape and have a through bore to permit the passage of fluid through the packer.
  • the packer prefferably secured in the well bore by means of two sets of radially extending barbs.
  • the barbs engage the wall of the bore, the upper set of barbs preventing upward movement of the packer and the lower set of barbs preventing downward movement of the packer.
  • Such packers may become damaged and have to be removed from the well bore. This is achieved by lowering a tool into the well bore on the end of a drill string.
  • the tool is provided with a milling cutter which is rotated to remove the upper set of barbs from the packer, and a retaining member which extends through the packer to retain the freed packer on the tool such that the packer is retained on the tool and may be retracted from the well bore.
  • US-A-3 352 593 discloses a tool for retrieving a packer having a through bore, the tool comprising an elongated body having a packer-cutting mill at one end and a packer retainer at the other end, the retainer being movable from a first position to a second position, in the first position the retainer having the diameter of its outer edge greater than the packer bore diameter to prevent the tool entering the packer bore, and in the second position the packer having the diameter of its outer edge less than the packer bore diameter to permit the tool to enter the packer bore and reach below the packer whereupon the retainer may return to said first position such that the retainer can support the packer.
  • a packer retrieval assembly for retrieving a packer from an oil well bore, said packer having a through bore
  • the packer retrieval assembly comprising an elongate body member having a packer releasing milling cutter and a packer retaining member mounted thereon, the packer retaining member being releasable from a first position to a second position, the first position being such that an outer face of the packer retaining member defines a diameter greater than the diameter of the packer bore, thus preventing the assembly from entering the bore, and the second position being such that the outer face of the packer retaining member defines a diameter less than the diameter of the packer bore, thus permitting the packer retrieval assembly to enter the bore and extend below the packer, whereupon the packer retaining member may return to the said first position such that the packer retaining member may support the packer, characterised in that the packer retaining member is initially retained in the first position by a set of first shear pins, the first shear pins being adapted to
  • the packer retaining member is releasable to a third position upon a force above a pre-selected magnitude being applied to the packer retrieval assembly, whereupon the packer is no longer supported by the packer retrieval assembly and the packer retrieval assembly disengages the packer.
  • the retaining member may be released to the third position when the packer sticks in the well bore resulting in said force above a pre-selected magnitude being applied to the assembly.
  • the packer retaining member when the packer retaining member supports the packer, the packer retaining member is supported in the first position by a second set of shear pins which are adapted to shear to permit the packer retaining member to be moved downwardly relative to the elongate body member and inwardly to the third position. Should the packer stick within the well bore the second set of pins may be sheared to permit the packer retaining member to be moved downwardly relative to the elongate body member and inwardly to the third position.
  • the packer retaining member is in the form of a grapple provided with a number of fingers having radially extending lower portions.
  • the packer retaining member is mounted on a mandrel having a shoulder portion on which the lower portion of the packer retaining member bears when in the first position.
  • a packer retrieval assembly for retrieving a packer having a through bore from an oil well bore, comprises an elongate body member 1 having a packer releasing milling cutter 2 and a packer retaining member 3 mounted thereon.
  • the body member 1 comprises three main parts; an upper mandrel 4, an extension piece 5, and a lower mandrel 6, and is provided with a central through bore 7 to permit drilling mud to be passed through the assembly.
  • the upper mandrel 4 is provided with a standard cone type screw thread 8 to enable the assembly to be fixed to the end of a drill string (not shown).
  • a drive bushing 9 is located on the mandrel 4 directly below the screw thread 8.
  • a second conical thread 10 is provided on the mandrel to co-operate with a screw thread 11 which is provided on an upper portion 12 of the packer releasing milling cutter 2.
  • the cutter 2 is in the form of a milling shoe and comprises the above mentioned upper portion 12, which is of substantially the same diameter as the drive bushing 9, and a lower portion 13 which is of a greater diameter.
  • the lower end 14 of the lower portion 13 is provided with a number of cutting teeth 15 which are coated with a suitably hard cutting material 16. Lateral grooves 17 on the outer surface of the lower portion 13 allow drilling mud, carrying debris that has been cut from the upper portion of a packer (not shown) by the cutting teeth 15, to pass upwardly towards the surface.
  • the extension piece 5 is threadaoly fixed at 18 to the lower end of the upper mandrel 4 and passes through and extends from the lower portion 13 of the cutter 2.
  • the length of the extension piece 5 used in the assembly is chosen to suit the length of the packer which the assembly is being used to retrieve.
  • the lower mandrel 6, is threadably fixed at 19 to the lower end of the extension piece 5.
  • a bullnose 20 having an outer diameter that is slightly smaller than the diameter of the through bore of the packer to be retrieved.
  • the lower edge 21 of the bullnose 20 is rounded to facilitate entry of the bullnose 20 into the packer bore.
  • the retaining member 3 is mounted on the lower mandrel 6 above the bullnose 20.
  • the retaining member 3 is in the form of a grapple 22 having a number of downwardly extending fingers 23.
  • the grapple 22 is suspended from the mandrel 6 by a helical spring 24 which is situated within a cylindrical sleeve 25 which extends downwardly from the upper end portion of the mandrel 6.
  • the grapple 22 is provided with a collar 26 from which the fingers 23 extend.
  • Each finger 23 comprises a relatively thin walled upper portion 27 and an outwardly tapering lower portion 28.
  • Each lower portion 28 is provided with a bevelled edged radially extending shoulder 29 above which is provided a through bore 30 for accommodating an end portion of a respective one of a first set of shear pins 31.
  • the outer surface of the lower mandrel 6 is provided with an annular shoulder 32, the edges 33 and 34 of which are bevelled. Bores 35 are provided in the shoulder to receive the end portions of the first set of shear pins 31.
  • the assembly When the assembly is to be used to retrieve a damaged packer the assembly is lowered down the oil well on the end of a drill string.
  • the grapple 22 is in a first position as is shown in Fig. 2. In this position the lower face of the collar 26 of the grapple 22 rests upon the shear ring 40 which is held in position by the second set of shear pins 38 and the lower portion of each grapple finger 23 is positioned on the shoulder 32 of the lower mandrel 6.
  • the fingers 23 are secured to the mandrel 6 by the first set of shear pins 31 and the shoulder 29 of each finger 23 extends radially beyond the outer face of the bullnose 20 such that the shoulders 29 define a circle of greater diameter than the bullnose 20.
  • the grapple 22 On leaving the lower end port:on of the packer the grapple 22 is urged by the spring 24 to return to the first position, where the lower portions of each grapple finger 23 is positioned on the shoulder 32 of the mandrel 6.
  • the assembly is lowered further until the lower end 14 of the milling cutter 2 contacts the upper end portion of the packer.
  • the assembly moves up through the packer until the shoulder 29 of each grapple finger 23 contacts the lower end portion of the packer.
  • the grapple 22 is prevented from moving downwards relative to the mandrel 6 under the weight of the packer by the collar 26 bearing against the shear ring 40 which is retained by the second set of shear pins 38.
  • the packer is retained on the assembly and may be retrieved from the well bore with the assembly.
  • the pulling forces on the drill string required to free the packer and the assembly may be such that the drill string, or the assembly, may break leaving the packer and parts of the assembly, or the drill string, in the well bore.
  • the dimensions and the material of the second set of shear pins 38 are chosen such that the pins 38 will be sheared by the force applied from the grapple 22 before the magnitude of force necessary to damage the drill string or the assembly is reached.
  • the ring 40 When the shear pins 38 shear, the ring 40 may fall to the step 36 and the grapple 22 may move downwardly relative to the mandrel 6 to a third position as is shown in Fig. 4.
  • the packer retrieval assembly of the present invention gives the operator a clear indication when the assembly is in contact with the packer to be removed and provides a releasable grapple or drill string if the packer becomes jammed during retrieval.

Landscapes

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

Claims (5)

  1. Vorrichtung zur Wiederbeschaffung eines Dichtungsstückes aus einer Ölbohrung, wobei das Dichtungsstück eine Durchgangsbohrung aufweist und die Vorrichtung einen länglichen Hauptkörper (1) mit einem das Dichtungsstück freisetzenden Fräswerkzeug (2) und einem daran befestigten Halteteil (3) für das Dichtungsstück umfaßt, das aus einer ersten Position in eine zweite Position freisetzbar ist, wobei die erste Position derart beschaffen ist, daß eine Außenfläche (29) des Dichtungsstück-Halteteils (3) einen Durchmesser größer als der Durchmesser der Bohrung des Dichtungsstuckes ergibt, so daß die Vorrichtung an einem Eintritt in die Bohrung gehindert wird, und wobei die zweite Position derart beschaffen ist, daß die Außenfläche (29) des Dichtungsstück-Halteteils (3) einen Durchmesser kleiner als der Durchmesser der Bohrung des Dichtungsstückes ergibt, so daß die Vorrichtung in die Bohrung eintreten kann und sich bis unterhalb des Dichtungsstückes erstreckt, worauf das Halteteil (3) für das Dichtungsstück in die erste Position zurückkehren kann, so daß das Dichtungsstück-Halteteil (3) das Dichtungsstück abstützen kann,
    dadurch gekennzeichnet, daß das Dichtungsstück-Halteteil (3) anfänglich in der ersten Position durch einen Satz von ersten Abscherbolzen (31) gehalten wird, welche sich abscheren lassen, wenn das Dichtungsstück-Halteteil (3) den oberen Abschnitt des Dichtungsstückes berührt und wenn eine vorgewählte Kraft auf den länglichen Hauptkörper (1) ausgeübt wird, so daß das Dichtungsstück-Halteteil (3) relativ zu dem länglichen Hauptkörper (1) nach oben und nach innen in die zweite Position bewegt werden kann.
  2. Vorrichtung zur Wiederbeschaffung eines Dichtungsstückes nach Anspruch 1,
    dadurch gekennzeichnet, daß das Dichtungsstück-Halteteil (3) in eine dritte Position freisetzbar ist, wenn eine Kraft oberhalb einer vorgewählten Größe auf die Vorrichtung ausgeübt wird, worauf das Dichtungsstück nicht länger durch die Vorrichtung abgestützt wird und die Vorrichtung von dem Dichtungsstück gelöst wird.
  3. Vorrichtung zur Wiederbeschaffung eines Dichtungsstückes nach Anspruch 2,
    dadurch gekennzeichnet, daß wenn das Dichtungsstück-Halteteil (3) das Dichtungsstück abstützt das Dichtungsstück-Halteteil (3) in der ersten Position durch einen zweiten Satz von Abscherbolzen (38) abgestützt wird, die sich abscheren lassen, damit das Dichtungsstück-Halteteil (3) relativ zu dem länglichen Hauptkörper (1) nach unten und nach innen in die dritte Position bewegt werden kann.
  4. Vorrichtung zur Wiederbeschaffung eines Dichtungsstückes nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß das Dichtungsstück-Halteteil (3) nach Art eines Fangeisens (22) ausgebildet ist und eine Anzahl von Fingern (23) mit radial verlaufenden unteren Abschnitten (28) aufweist.
  5. Vorrichtung zur Wiederbeschaffung eines Dichtungsstückes nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß das Dichtungsstück-Halteteil (3) an einem Dorn (6) befestigt ist, der einen Schulterbereich (32) aufweist, an welchem der untere Abschnitt des Dichtungsstück-Halteteils (3) anliegt, wenn es sich in der ersten Position befindet.
EP86306065A 1985-08-08 1986-08-06 Vorrichtung zum Zurückziehen eines Packers Expired - Lifetime EP0213798B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB858519924A GB8519924D0 (en) 1985-08-08 1985-08-08 Packet retrieval assembly
GB8519924 1985-08-08

Publications (3)

Publication Number Publication Date
EP0213798A2 EP0213798A2 (de) 1987-03-11
EP0213798A3 EP0213798A3 (en) 1989-01-11
EP0213798B1 true EP0213798B1 (de) 1991-04-03

Family

ID=10583495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306065A Expired - Lifetime EP0213798B1 (de) 1985-08-08 1986-08-06 Vorrichtung zum Zurückziehen eines Packers

Country Status (4)

Country Link
EP (1) EP0213798B1 (de)
DE (1) DE3678512D1 (de)
GB (1) GB8519924D0 (de)
NO (1) NO863196L (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5605366A (en) * 1994-11-23 1997-02-25 Weatherford/Lamb, Inc. External pulling tool and method of operation
US5639135A (en) * 1994-11-23 1997-06-17 Enterra Oil Field Rental Fishing tool and method of operation
US5580114A (en) * 1994-11-25 1996-12-03 Baker Hughes Incorporated Hydraulically actuated fishing tool
GB2318134B (en) * 1996-10-08 2000-12-13 Baker Hughes Inc Running and setting tool for packers
CN109083610B (zh) * 2018-09-21 2021-03-02 中国石油集团渤海钻探工程有限公司 可退式打捞公锥

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051239A (en) * 1958-04-21 1962-08-28 Otis Eng Co Running and pulling tool
US3150718A (en) * 1960-10-13 1964-09-29 Baker Oil Tools Inc Subsurface retrieving apparatus
US3352593A (en) * 1965-10-22 1967-11-14 Houston Engineers Inc Well bore packer, milling and removing tool
US3638988A (en) * 1969-10-27 1972-02-01 Cicero C Brown Latch assembly for well tools
US3960399A (en) * 1974-12-16 1976-06-01 Alex Dufrene Setting and retrieval device for down-hole equipment
EP0086582B1 (de) * 1982-01-27 1988-04-27 The Red Baron (Oil Tools Rental) Limited Vorrichtung zur Entfernung von Packern aus Erdölbohrlöchern
US4616721A (en) * 1984-11-27 1986-10-14 Smith International, Inc. Packer Mill

Also Published As

Publication number Publication date
DE3678512D1 (de) 1991-05-08
NO863196D0 (no) 1986-08-07
EP0213798A3 (en) 1989-01-11
GB8519924D0 (en) 1985-09-18
NO863196L (no) 1987-02-09
EP0213798A2 (de) 1987-03-11

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