EP0523301B1 - Suspension de tubage pour tête de puits - Google Patents

Suspension de tubage pour tête de puits Download PDF

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Publication number
EP0523301B1
EP0523301B1 EP91306609A EP91306609A EP0523301B1 EP 0523301 B1 EP0523301 B1 EP 0523301B1 EP 91306609 A EP91306609 A EP 91306609A EP 91306609 A EP91306609 A EP 91306609A EP 0523301 B1 EP0523301 B1 EP 0523301B1
Authority
EP
European Patent Office
Prior art keywords
casing
teeth
rings
housing
axially
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
EP91306609A
Other languages
German (de)
English (en)
Other versions
EP0523301A1 (fr
Inventor
Edward Thomas Thornburrow
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.)
Cooper Industries LLC
Original Assignee
Cooper Industries LLC
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 Cooper Industries LLC filed Critical Cooper Industries LLC
Priority to EP91306609A priority Critical patent/EP0523301B1/fr
Priority to DE69108021T priority patent/DE69108021T2/de
Publication of EP0523301A1 publication Critical patent/EP0523301A1/fr
Application granted granted Critical
Publication of EP0523301B1 publication Critical patent/EP0523301B1/fr
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
    • 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
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/04—Casing heads; Suspending casings or tubings in well heads
    • E21B33/0422—Casing heads; Suspending casings or tubings in well heads a suspended tubing or casing being gripped by a slip or an internally serrated member

Definitions

  • One such prior emergency suspension comprises an annular slip and seal assembly which is formed in two parts which are hinged together so that the assembly can be wrapped around a casing to be supported.
  • the assembly incorporates a slip bowl, and a ring of complementary segmental slips, and, above the slips, an elastomeric seal.
  • the assembly is wrapped around a casing and landed on a wellhead support surface near to the bottom of the slip and seal assembly, and the slips are energised, by means of screws or by casing weight, to grip the casing.
  • BOP blowout preventer
  • one disadvantage of such an arrangement is that the two-part construction of the slip and seal assembly inevitably involves a possibility of failure at the very high pressures to which the seal may be subjected in use, requiring the assembly to be made more robust than might otherwise be necessary. An increase in completion height for that casing string may also be necessary. Modern practice also prefers metal to metal seals rather than elastomeric seals. A further consideration is that there is very little radial clearance in the annulus between a casing and the next outer casing, particularly with large casing sizes of nominal OD 27,3 cm (10 3/4") and above.
  • a wellhead suspension device for a casing string comprises a tubular housing which is arranged to be landed at a wellhead; a plurality of axially spaced circumferential grooves in the radially inner surface of the housing, each groove having a depth which tapers axially to form a slip ring bowl; and, captive but axially movable within each groove, a respective rigid, circumferentially continuous, one part, metal sealing and slip ring which projects radially inwardly from the respective groove and which is provided with teeth on its radially inner surface.
  • the invention also includes a method of suspending at a wellhead a casing string, which has become stuck before being fully run into the well bore, the method comprising, (preferably after cutting off an excess length at the upper end of the casing and bevelling the upper end of the remaining casing), fitting the tubular housing of a novel device according to the invention down over an upper end of the casing by stretching the casing longitudinally and landing the housing in the wellhead so that an interference fit between the slip rings and the casing draws the slip rings axially upwardly in their respective grooves whilst allowing the rings to ride down the casing, and subsequently releasing the casing so that the slip rings are drawn by the casing axially downwards in their respective grooves to positions in which the rings jam between the casing and housing and the teeth on the radially inner surfaces of the rings bite into the casing both to secure the casing and to create a seal between the housing and the casing.
  • the new support has the advantage of providing metal to metal sealing and automatic energization of the slip sealing rings by the casing string weight in a construction in which the tubular housing and slip rings may be slim enough to be accepted in the narrow annulus around a casing to be supported, so that in spite of the multiple slip ring grooves there is no need for an increase in the height of the completion above the normal height.
  • the teeth on the radially inner surface of the rings are preferably annular circumferential teeth which are inclined axially upwardly, that is to say axially towards the wider ends of the grooves, so that they will ride down the casing, but bite into the casing when tended to be forced up the casing upon release of the stretched casing.
  • each ring annular circumferential teeth finer than those on the radially inner surface. The purpose of these fine teeth is to spread the jamming load between the rings and the tubular housing, upon jamming of the rings in the narrower lower ends of the grooves, to avoid excessive localised radial forces which might distort the casing.
  • the tubular housing may be a depending portion of a spool, but is preferably a depending portion of a hanger having, on its outer surface, a landing shoulder positioned axially above the grooves.
  • the device may then be provided with an upwardly projecting neck, such as a screw threaded tongue, for carrying of a conventional external sealing assembly and possibly a landing for the hanger of the next inner casing string.
  • the tubular housing may be provided, below the annular grooves, with a guide funnel and centralising fingers for use when the housing is lowered over a casing to be supported.
  • the suspension device may be manufactured by machining the tubular housing, with the grooves formed in an internal substantially cylindrical envelope, and advancing the slip rings in an unexpanded state axially into the body into alignment with respective ones of the grooves, and then expanding the rings radially outwardly beyond their elastic limit, using an hydraulic or mechanical tool, until they are captive in the grooves and have the appropriate diameter.
  • a casing housing 10 is assumed to be landed in a wellhead and carries a string of 33,97 cm (13 3/8") OD casing 11 in conventional fashion via a screw thread 12.
  • a 27,3 cm (10 3/4") OD casing string 13 is shown having been run into the well bore through the string 11.
  • the upper end of the exposed section of casing is cut off at the wellhead with a mechanical casing cutter to provide an upper end 14 of the casing, which is then milled to provide the conventional external bevel 15 as shown in Figure 2.
  • an emergency tubular hanger having a body 16 with a landing shoulder 17, and a depending housing portion 18 formed on its inner surface with five axially spaced annular grooves 19. These grooves taper downwardly at the conventional slip angle of 8°, to form slip ring bowls.
  • a tapering sealing and slip ring 20 formed on its radially outer surface with fine annular circumferential teeth 21, and on its radially inner surface with three upwardly inclined circumferential annular teeth 22. These teeth project into a radially inner cylindrical envelope of the housing 18.
  • the housing 18 is provided with external centralising fingers 23 and a guide funnel 24.
  • the hanger has a conventional seal neck 25 having an external screw thread 26, for normal a 27,3 cm (10 3/4") seal assembly.
  • the emergency hanger 16 is assembled together with an installation tool 27, which is screwed to the neck 25 and a tool carrier 28, which carries at its lower end a 27,3 cm (10 3/4") casing spear.
  • the tool 27 is sealed by O sealing rings, 29 to the spool 10, and 30 to the tool 28.
  • the assembly is lowered so that the tubular housing 18 enters the annulus 31 between the casings 11 and 13, guided by the funnel 24 and centralised by the fingers 23. Simultaneously the casing spear enters the top of the casing 13. This continues until the shoulder 17 lands on a complementary landing bowl in the housing 10, as shown in Figure 1.
  • the emergency hanger By means of pressure applied downwardly on an upper surface 32 of the tool 27, the emergency hanger is held down on its landing in the spool 10.
  • the casing spear is then pulled upwardly to stretch the casing string 13 and to cause the upper end 14 of the casing to be drawn up through the housing 18 and through the slip sealing rings 20.
  • the interference between the casing and the rings draws each ring up until it abuts the upper end of its respective groove 19, whereafter the upward movement of the casing causes it to ride through the rings. This is continued until the casing has been drawn up through all five rings.
  • the housing 16 might be made of 75 K steel and the rings 20 from a hard material such as an inconel alloy.

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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)
  • Earth Drilling (AREA)

Claims (8)

  1. Dispositif de suspension d'une ligne de tubage au niveau d'une tête de puits, le dispositif comportant un boîtier tubulaire (18) qui est agencé pour être en appui au niveau d'une tête de puits, plusieurs gorges circonférentielles (19) axialement espacées situées dans la surface radialement intérieure du boîtier, chaque gorge ayant une profondeur qui diminue axialement pour former une cuvette pour anneau formant coulisse, et, en étant captif mais axialement mobile à l'intérieur de chaque gorge, un anneau correspondant (20) d'étanchéité et formant coulisse, métallique, rigide, continu circonférentiellement, en une seule pièce, qui fait saillie radialement vers l'intérieur à partir de la gorge correspondante et qui est muni de dents (22) sur sa surface radialement intérieure.
  2. Dispositif selon la revendication 1 dans lequel les dents sont des dents (22) circonférentielles annulaires qui sont inclinées axialement vers le haut.
  3. Dispositif selon la revendication 1 ou 2, dans lequel d'autres dents (21) sont agencées sur la surface radialement extérieure de chaque anneau, les autres dents étant des dents circonférentielles annulaires, plus petites que celles existant sur la surface radialement intérieure de l'anneau.
  4. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le boîtier tubulaire est une partie suspendue d'un dispositif de suspension (16) comportant, sur sa surface extérieure, un épaulement d'appui (17) positionné axialement au dessus des gorges.
  5. Dispositif selon la revendication 4, qui comporte un col fileté (25) faisant saillie vers le haut pour supporter un ensemble d'étanchéité.
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le boîtier tubulaire est muni, en dessous des gorges annulaires, d'un entonnoir de guidage (24) et de doigts de centrage (23).
  7. Procédé consistant à suspendre au niveau d'une tête de puits une ligne de tubage (13) qui a été immobilisée avant d'être entièrement descendue à l'intérieur de l'alésage de puits, le procédé consistant à agencer le boîtier tubulaire (18) d'un dispositif selon l'une quelconque des revendications précédentes vers le bas sur une extrémité supérieure du tubage par étirage du tubage longitudinalement et mise en appui du boîtier dans la tête de puits de telle sorte qu'un agencement avec interaction existant entre les anneaux (20) formant coulisse et le tubage tire les anneaux formant coulisse axialement vers le haut dans leur gorge respective (19) tout en permettant aux anneaux de se déplacer vers le bas du tubage, et à ensuite relâcher le tubage de telle sorte que les anneaux formant coulisse sont tirés par le tubage axialement vers le bas dans leur gorge respective vers des positions dans lesquelles les anneaux sont coincés entre le tubage et le boîtier et les dents (22) situées sur les surfaces radialement intérieures des anneaux mordent dans le tubage à la fois pour fixer le tubage et pour créer une étanchéité entre le boîtier et le tubage.
  8. Procédé selon la revendication 7, dans lequel une longueur en excès existant au niveau de l'extrémité supérieure du tubage est découpée et le bord supérieur du tubage est biseauté (15) avant d'agencer le dispositif sur le tubage.
EP91306609A 1991-07-19 1991-07-19 Suspension de tubage pour tête de puits Expired - Lifetime EP0523301B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP91306609A EP0523301B1 (fr) 1991-07-19 1991-07-19 Suspension de tubage pour tête de puits
DE69108021T DE69108021T2 (de) 1991-07-19 1991-07-19 Verrohrungsaufhängung für Bohrlochkopf.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91306609A EP0523301B1 (fr) 1991-07-19 1991-07-19 Suspension de tubage pour tête de puits

Publications (2)

Publication Number Publication Date
EP0523301A1 EP0523301A1 (fr) 1993-01-20
EP0523301B1 true EP0523301B1 (fr) 1995-03-08

Family

ID=8208350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91306609A Expired - Lifetime EP0523301B1 (fr) 1991-07-19 1991-07-19 Suspension de tubage pour tête de puits

Country Status (2)

Country Link
EP (1) EP0523301B1 (fr)
DE (1) DE69108021T2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413171A (en) * 1992-05-01 1995-05-09 Downhole Systems, Inc. Latching and sealing assembly
US11396785B2 (en) * 2020-05-11 2022-07-26 Saudi Arabian Oil Company Low pressure starter wellhead system for oil and gas applications with potential thermal growth
CN111997559B (zh) * 2020-09-10 2022-11-25 江苏金石机械集团有限公司 一种可分离式悬挂器密封套装置
US11920416B2 (en) 2020-12-18 2024-03-05 Baker Hughes Oilfield Operations Llc Metal-to-metal annulus packoff retrieval tool system and method
US11939832B2 (en) * 2020-12-18 2024-03-26 Baker Hughes Oilfield Operations Llc Casing slip hanger retrieval tool system and method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312476A (en) * 1939-05-26 1943-03-02 Arthur J Penick Well head
US2400254A (en) * 1944-06-16 1946-05-14 Arthur J Penick Casing head
US2426371A (en) * 1945-05-29 1947-08-26 Oil Ct Tool Company Casing and tubing head assembly
US2824757A (en) * 1955-04-04 1958-02-25 George A Butler Pipe suspension and sealing means with means to limit compression of the seal
US3994517A (en) * 1975-10-01 1976-11-30 W-K-M Wellhead Systems, Inc. Pipe anchor for wellhead assemblies
US4949786A (en) * 1989-04-07 1990-08-21 Vecto Gray Inc. Emergency casing hanger

Also Published As

Publication number Publication date
DE69108021D1 (de) 1995-04-13
EP0523301A1 (fr) 1993-01-20
DE69108021T2 (de) 1995-07-06

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