EP0517968B1 - Perfectionnements à la constitution de puits ou en s'y rapportant - Google Patents

Perfectionnements à la constitution de puits ou en s'y rapportant Download PDF

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Publication number
EP0517968B1
EP0517968B1 EP19910305193 EP91305193A EP0517968B1 EP 0517968 B1 EP0517968 B1 EP 0517968B1 EP 19910305193 EP19910305193 EP 19910305193 EP 91305193 A EP91305193 A EP 91305193A EP 0517968 B1 EP0517968 B1 EP 0517968B1
Authority
EP
European Patent Office
Prior art keywords
bore
wellhead
shoulder
run
elements
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
EP19910305193
Other languages
German (de)
English (en)
Other versions
EP0517968A1 (fr
Inventor
Colin Gordon
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 DE1991608012 priority Critical patent/DE69108012T2/de
Priority to EP19910305193 priority patent/EP0517968B1/fr
Publication of EP0517968A1 publication Critical patent/EP0517968A1/fr
Application granted granted Critical
Publication of EP0517968B1 publication Critical patent/EP0517968B1/fr
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
    • 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
    • E21B17/1007—Wear protectors; Centralising devices, e.g. stabilisers for the internal surface of a pipe, e.g. wear bushings for underwater well-heads
    • 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

Definitions

  • This invention relates to the formation of drilling wells which are used in the extraction of fuel such as oil or gas.
  • a wellhead In the formation of well bores a wellhead is secured in position and a bore is drilled below that wellhead by passing a drill through a bore in the wellhead.
  • the wellhead may be on land, on a platform above sea level or on the seabed.
  • a wear bushing which acts to protect the wall of the bore. This is important since the wall of the wellhead bore is later required to act as a sealing surface against elements which locate within that bore.
  • the bore in the wellhead has to have a certain minimum diameter.
  • casing strings and casing hangers are subsequently lowered into the bore by passing them through the wellhead bore. These are usually supported from a casing hanger which rests upon a shoulder formed in the wall of the wellhead bore. Because of the relative diameters which conventionally have been used, it has not been possible to leave the wear bushing in place when the casings and casing hangers have been lowered into the well bore. This has meant that the sealing surface of the wellhead bore can be damaged as the casings and casing hangers are passed through that bore.
  • GB-A-2193519 discloses a wellhead having a bore incorporating a generally tubular element having an external shoulder which lands on a shoulder of the wall of the bore, and an internal shoulder providing a landing shoulder for elements which are run into the bore; and according to a first aspect of the present invention, such a wellhead is characterised by a bore protector positioned above the tubular element having a central bore which is sufficiently large to allow the elements which are run into the bore to pass through the central bore so that the protector can be maintained in its operative position during the running of the elements to protect the sealing surface of the wellhead bore.
  • GB-A-2193519 also discloses a method of forming a well bore which includes the step of locating within a wellhead housing a tubular element having an external shoulder and an internal shoulder providing a landing shoulder for elements which are run into the bore, so that the external shoulder lands upon a shoulder of the wall of the bore; and according to a second aspect of the present invention, such a method is characterized by protecting the sealing surface of the wellhead housing bore whilst the elements (25) which are run into the bore, such as casing and tubing strings are run through the wellhead.
  • Such a wellhead and method allow the diameter of the casing hangers to be reduced so that they can pass through the internal diameter of a wear bushing within the wellhead bore.
  • This therefore acts as protection for the sealing surface on the wellhead bore.
  • the drawing is a sectional view of a wellhead housing incorporating a tubular element in accordance with the present invention.
  • a generally tubular wellhead housing (10) which has a through bore (11).
  • the upper part of the wellhead bore (11) accommodates a generally tubular wear bushing (12) which has been landed upon a shoulder (14) formed in the wall of the wellhead bore.
  • the wear bushing (12) is provided to protect the sealing surface (15) of the wellhead bore from damage as elements are passed through the wellhead bore.
  • a generally tubular element (20) which comprises a lower tubular part (21) and an upper tubular part (22) of slightly greater diameter with a shoulder (23) formed therebetween.
  • the exterior of the shoulder (23) rests upon a shoulder (24) formed in the wall of the wellhead bore.
  • the internal part of the shoulder (23) has landed thereon a correspondingly shaped shoulder formed on the exterior of a casing hanger (25).
  • the casing hanger is lowered into the position shown in the drawing by means of a casing hanger running tool which is illustrated at (26).
  • the casing hanger (25) is used to support casing strings which are run into the well bore and suspended from the casing hanger.
  • the tubular element (20) Prior to formation of the well bore below the wellhead housing (10), it will be appreciated that the tubular element (20) is not in position within the wellhead to allow clearance for a drill bit.
  • the wear bushing (12) is lowered into the position shown in the drawing by means of a wear bushing running tool. A drill bit is then lowered on a drill pipe so that it passes through the wellhead bore, the sealing surface (15) of the bore being protected during such operation by the wear bushing (12).
  • the well bore is then drilled in a manner which will be apparent to those skilled in the art.
  • the drill is withdrawn to the surface and the wear bushing (15) is retrieved using the wear bushing running tool.
  • the tubular member (20) is lowered into the position shown in the drawing using an appropriate running tool.
  • the tubular member (20) is held in place in the wellhead housing by annular seals (28).
  • the running tool is then recovered and the wear bushing (12) is then lowered into position again using the wear bushing running tool.
  • casing strings are then run into the well bore.
  • the casing hanger (25) is attached to the casing string and lowered using the casing hanger running tool (26) to the position shown in the drawing in a manner which will be apparent to those skilled in the art.
  • tubular member (20) which acts as a false bowl it is possible to employ a casing hanger (25) of slightly reduced diameter relative to one which has to rest upon the shoulder (24).
  • a casing hanger (25) which can pass through the central bore of the wear bushing (15).
  • the wear bushing (15) can be retained in position during the steps of lowering the casing strings into position.
  • the sealing surface of the well bore is protected during this operation and should not be damaged and thereby assist in maintaining a good surface for subsequent metal-to-metal seals which are provided within the wellhead bore.

Landscapes

  • 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)
  • Excavating Of Shafts Or Tunnels (AREA)

Claims (3)

  1. Tête de puits comportant un alésage comportant un élément généralement tubulaire (20) ayant un épaulement extérieur qui est en appui sur un épaulement de la paroi de l'alésage et un épaulement intérieur fournissant un épaulement d'appui pour des éléments (25) qui sont descendus dans l'alésage; caractérisée en ce qu'un protecteur (12) d'alésage positionné au-dessus de l'élément tubulaire (20) ayant un alésage central qui est suffisamment large pour permettre aux éléments (25) qui sont descendus dans l'alésage de passer à travers l'alésage central de sorte que le protecteur peut être maintenu dans sa position active pendant la descente des éléments pour protéger la surface d'étanchéité de l'alésage de tête de puits.
  2. Tête de puits selon la revendication 1, dans laquelle l'élément tubulaire (20) a une épaisseur de paroi généralement uniforme, et l'élément comporte deux parties (21, 22) tubulaires coaxiales décalées axialement l'une par rapport à l'autre, la partie supérieure (22) étant d'un diamètre légèrement plus grand que la partie inférieure (21), et les épaulements intérieur et extérieur étant formés entre les deux parties.
  3. Procédé de formation d'un alésage (11) de puits qui comporte l'étape de positionnement dans un boîtier de tête de puits d'un élément tubulaire (20) ayant un épaulement extérieur et un épaulement intérieur fournissant un épaulement d'appui pour des éléments (25) qui sont descendus dans l'alésage (11), de sorte que l'épaulement extérieur soit en appui sur un épaulement (24) de la paroi de l'alésage, et caractérisé en ce qu'il protège la surface d'étanchéité de l'alésage du boîtier de tête de puits lorsque les éléments (25) qui sont descendus dans l'alésage, tels que des lignes de tubes et de tubage sont descendus à travers la tête de puits.
EP19910305193 1991-06-10 1991-06-10 Perfectionnements à la constitution de puits ou en s'y rapportant Expired - Lifetime EP0517968B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1991608012 DE69108012T2 (de) 1991-06-10 1991-06-10 Verbesserungen bei oder in Verbindung mit der Erstellung von Bohrlöchern.
EP19910305193 EP0517968B1 (fr) 1991-06-10 1991-06-10 Perfectionnements à la constitution de puits ou en s'y rapportant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19910305193 EP0517968B1 (fr) 1991-06-10 1991-06-10 Perfectionnements à la constitution de puits ou en s'y rapportant

Publications (2)

Publication Number Publication Date
EP0517968A1 EP0517968A1 (fr) 1992-12-16
EP0517968B1 true EP0517968B1 (fr) 1995-03-08

Family

ID=8208304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910305193 Expired - Lifetime EP0517968B1 (fr) 1991-06-10 1991-06-10 Perfectionnements à la constitution de puits ou en s'y rapportant

Country Status (2)

Country Link
EP (1) EP0517968B1 (fr)
DE (1) DE69108012T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6966381B2 (en) * 2003-04-09 2005-11-22 Cooper Cameron Corporation Drill-through spool body sleeve assembly

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230421A (en) * 1938-06-07 1941-02-04 Cameron Iron Works Inc Pipe hanger
US3473607A (en) * 1968-02-19 1969-10-21 Ignace Castille Bushing for casing during rotary drilling operations
GB8615796D0 (en) * 1986-06-21 1986-08-06 Nat Supply Co Uk Ltd Surface casing assembly
US4942925A (en) * 1989-08-21 1990-07-24 Dresser Industries, Inc. Liner isolation and well completion system
US5044438A (en) * 1990-03-16 1991-09-03 Young Joe A Wellhead bowl protector and retrieving tool

Also Published As

Publication number Publication date
DE69108012D1 (de) 1995-04-13
DE69108012T2 (de) 1995-07-06
EP0517968A1 (fr) 1992-12-16

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