EP2245262B1 - Vorrichtung in einem kombinierten bohrlochkopf-/rohrstrang - Google Patents

Vorrichtung in einem kombinierten bohrlochkopf-/rohrstrang Download PDF

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Publication number
EP2245262B1
EP2245262B1 EP09703755.0A EP09703755A EP2245262B1 EP 2245262 B1 EP2245262 B1 EP 2245262B1 EP 09703755 A EP09703755 A EP 09703755A EP 2245262 B1 EP2245262 B1 EP 2245262B1
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EP
European Patent Office
Prior art keywords
wellhead
pipe string
assembly
elastomeric matrix
outer casing
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.)
Active
Application number
EP09703755.0A
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English (en)
French (fr)
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EP2245262A4 (de
EP2245262A1 (de
Inventor
Espen Pettersen
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Vasshella Flexibles As
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Vasshella Flexibles As
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Publication of EP2245262A1 publication Critical patent/EP2245262A1/de
Publication of EP2245262A4 publication Critical patent/EP2245262A4/de
Application granted granted Critical
Publication of EP2245262B1 publication Critical patent/EP2245262B1/de
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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
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
    • 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
    • E21B33/043—Casing heads; Suspending casings or tubings in well heads specially adapted for underwater well heads

Definitions

  • the present invention relates to a combined wellhead, outer casing and pipe string assembly, which outer casing is designed to be installed in a well bore in the sea bed and the casing is generally cemented to the sea bed formation, which wellhead, in the installed state, is supported on the outer casing via an annular abutment, this engagement then supporting the weight of the pipe string within the outer casing.
  • an assembly of the introductory kind which is distinguished in that an articulated joint is introduced between the pipe string and the wellhead, which joint is able to transfer axially acting forces at the same time as being unable to transfer bending moments between said pipe string and said wellhead.
  • the joint comprises an elastomeric matrix located at the interface between the wellhead and the pipe string.
  • the elastomeric matrix can include at least one embedded reinforcing lamella.
  • the elastomeric matrix can include at least one embedded reinforcing lamella.
  • the elastomeric matrix can be in the form of a rubber material, natural or synthetic, possibly resilient polymer material.
  • elastomeric matrix can be vulcanized, glued or similar to a sheet of metal which in turn is fixed to the wellhead.
  • the elastomeric matrix can be vulcanized, glued or similar to a sheet of metal which in turn is fixed to the pipe string.
  • the wellhead is provided with a radially inwardly directed flange having upwardly facing surface for placement of the elastomeric matrix, alternatively the sheet of metal.
  • the pipe string may have a radially outwardly directed flange having downwardly facing surface for placement of the elastomeric matrix, alternatively the sheet of metal.
  • the respective sheets of metal can for example be secured to the wellhead, respectively the pipe string, by means of bolt connections.
  • At least one sealing ring can be included in the joint structure in order to provide for pressure integrity between the pipes.
  • a clearance is present between the peripheral circumferential surface of the pipe string flange and the internal surface of the wellhead. This provides a limited freedom of motion.
  • a clearance may be present between the external surface of the pipe string and the internal surface of the wellhead flange, which provides a limited freedom of motion.
  • a first, large dimension outer casing 8 is initially lowered into a well bore B in the sea bed 7. Typical diameter is 30". This outer casing 8 is normally 60-100 meters long and is cemented into the well bore B.
  • the well bore B is predrilled down through the formation of the sea bed in a length corresponding to the length above. The drill bit used is normative for the dimension of the well bore B.
  • the casings 3, 8 are assembled of shorter single casing pipes, alternatively stands consisting of three preassembled single pipes, which are joined together by means of threaded connections as they are lowered down into the well bore.
  • the second outer casing 3 terminates in a wellhead 2 at top, which has inner and outer coupling means which are commonly known in the art.
  • the outer coupling means are intended to engage with a termination part 1 at the end of the outer casing 8, which termination part 1 has corresponding, internal coupling means.
  • the wellhead 2 has an annular abutment 5 resting against an inside shoulder 5a formed internally of the termination part 1.
  • the wellhead 2 is traditionally welded to the top of the casing 3 at a place indicated by the reference number 4 in the drawings.
  • the weld is typically a butt weld grinded on both sides.
  • annulus 6 is formed between the outer casing 8 and the second outer casing 3 .
  • the annulus 6 is filled with cement C approximately up to the weld 4.
  • the termination part 1 and the wellhead 2 projects from the sea bed as indicated by the reference number 7.
  • One or more additional casings (not shown), having decreasingly smaller cross sectional dimension, can be installed within the casing 3, all in accordance with the needs regarding the drilling depth and the nature of the formation of the sea bed.
  • the number of pipes has less significance for the invention.
  • the wellhead 2 forms the connecting point for a Christmas three (not shown) which is normally landed from the surface.
  • the Christmas three has required safety mechanisms in the form of valves and rams in order to be able to handle different situations during well drilling and possibly subsequent production of oil and/or gas.
  • Figure 2 shows in longitudinal section a combined wellhead/pipe string assembly 10 according to the present invention in a contemplated installed situation, i.e. substantially vertically oriented. This is the situation it is referred to in this specification when it comes to the terms “upper”, “lower”, “top”, “bottom”, “upwardly”, “downwardly” etc. Those parts also found in figure 1 have the same reference numbers, but with the addition of a mark'.
  • the combined wellhead/pipe string assembly 10 is installed into the sea bed 7 in the very same way as illustrated in figure 1 .
  • the wellhead 2' is now a separate part which is in connection with the pipe string 3' via an elastomeric matrix 11 located in the interface between the wellhead 2' and the pipe string 3'.
  • the elastomeric matrix 11 can be in the form of a rubber material, natural or synthetic, alternatively a polymer material.
  • the wellhead 2' has in its lower end 2a an inwardly directed flange 2b.
  • the radially inwardly directed flange 2b has an upwardly facing surface 2c which forms a supporting surface for placement of the elastomeric matrix 11, as shown in further detail in figure 4 and 5 .
  • the pipe string 3' has in its upper end 3a a radially outwardly directed flange 3b.
  • the radially outwardly directed flange 3b has a downwardly facing surface 3c which forms abutment surface for location of the elastomeric matrix 11, as shown in closer detail in figures 4 and 5 .
  • Figure 3 shows the pipe string 3' viewed from above, in particular the outwardly directed flange 3b.
  • the elastomeric matrix 11 can in one embodiment include one or more embedded reinforcing lamellas 12, such as annularly formed plates of metal. These will be able to assist in regulating the load capacity and the rigidity according to specific requirements and demands.
  • the elastomeric matrix 11 constitutes part of a supporting element 13, which in turn acts and performs like a "joint" having limited freedom of motion, consisting of a lower annular reinforcing plate 14, an upper annular reinforcing plate 15 and the elastomeric matrix 11 located between the reinforcing plates 14, 15.
  • the reinforcing plates 14 and 15 are vulcanized or glued to the matrix 11.
  • One or more annular reinforcing plates, or lamellas 12 can possibly be vulcanized into the elastomeric matrix 11.
  • the number and the size of the reinforcing plates 12 will be factors that dictate the load capacity and rigidity of the support elements 13.
  • the support element 13 is secured to respective flange surfaces 2c and 3c by means of a number of bolts (not shown) that is passed through apertures 2e, 3e ( figures 3 and 4 ) in the flanges 2b and 3b of the wellhead 2' and the pipe string 3' respectively, and further down into corresponding threaded holes (14e, 15e) in the respective reinforcing plates 14 and 15 of the support element 13.
  • one or more sealing rings 9 can be provided between the respective flanges 2b, 3b and reinforcing plates 14, 15.
  • a clearance d 1 is intentionally provided between the peripheral circumferential surface 3d of the pipe string flange 3b and the internal surface 2f of the wellhead 2'.
  • a similar clearance d 2 is present between the external surface 3f of the pipe string 3' and the internal surface 2d of the wellhead flange 2b. This is provided to enable smaller motions between the parts without introducing bending or flexural moments of significance. Thus the limited freedom of motion is ensured.
  • the wellhead 2' As indicated in figure 2 , the wellhead 2' according to the invention is assembled of two parts, an upper part and a lower part 2a which are welded together as indicated by the weld seam w 1 .
  • the upper part 3a of the pipe string 3' is welded to the remainder of the pipe string by means of the weld seam w 2 as indicated in figure 2 . This is carried out in this way to be able to assemble the respective parts to each other, i.e. the pipe string 3', the support element 13 and the wellhead 2'.
  • the lower part 2a of the wellhead 2' needs to be installed within the upper part 3a of the pipe string 3', with the support element 13 between the flanges 2b and 3b, such as shown in figure 4 , before the respective welds w 1 and w 2 can be performed.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (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)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Claims (12)

  1. Kombinierte Anordnung (10) aus Bohrlochkopf (2'), Außengehäuse (8) und Rohrstrang (3'), wobei das Außengehäuse (8) zur Montage in einem Bohrloch (8) im Meeresboden (7) ausgelegt ist und das Gehäuse (8') im Allgemeinen in die Meeresbodenformation einzementiert ist, wobei der Bohrlochkopf (2') im montierten Zustand über ein ringförmiges Auflager (5) an dem Außengehäuse (8) aufliegt, wobei diese Kopplung dann das Gewicht des Rohrstrangs (3') innerhalb des Außengehäuse (8) trägt, dadurch gekennzeichnet, dass zwischen dem Rohrstrang (3') und dem Bohrlochkopf (2') eine Gelenkverbindung (13) eingeführt ist, wobei die Verbindung (13) in der Lage ist, axial wirkende Kräfte zur gleichen Zeit abzuführen, wobei sie nicht in der Lage ist, Biegemomente zwischen dem Rohrstrang (3') und dem Bohrlochkopf (2') abzuführen.
  2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Verbindung ein Stützelement bildet, das eine an der Grenzfläche zwischen dem Bohrlochkopf (2') und dem Rohrstrang (3') angeordnete elastomere Matrix (11) aufweist.
  3. Anordnung nach Anspruch 2, dadurch gekennzeichnet, dass die elastomere Matrix (11) mindestens eine eingebettete Verstärkungslamelle (12), wie eine Stahlplatte, aufweist.
  4. Anordnung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die elastomere Matrix (11) in der Form eines natürlichen oder synthetischen Kautschukmaterials, alternativ eines Polymermaterials vorliegt.
  5. Anordnung nach einem der Ansprüche 2-4, dadurch gekennzeichnet, dass die elastomere Matrix (11) an ein Metallblech (14), das wiederum am Bohrlochkopf (2') befestigt ist, vulkanisiert, geklebt oder ähnlich befestigt ist.
  6. Anordnung nach einem der Ansprüche 2-5, dadurch gekennzeichnet, dass die elastomere Matrix (11) an ein Metallblech (15), das wiederum am Rohrstrang (3') befestigt ist, vulkanisiert, geklebt oder ähnlich befestigt ist.
  7. Anordnung nach einem der Ansprüche 2-6, dadurch gekennzeichnet, dass der Bohrlochkopf (2') einen radial nach innen gerichteten Flansch (2b) mit nach oben zeigender Oberfläche (2c) zur Platzierung der elastomeren Matrix (11), alternativ des Metallblechs (14), aufweist.
  8. Anordnung nach einem der Ansprüche 2-7, dadurch gekennzeichnet, dass der Rohrstrang (3') einen radial nach außen gerichteten Flansch (3b) mit nach unten zeigender Oberfläche (3c) zum Aufliegen der elastomeren Matrix (11), alternativ des Metallblechs (15), aufweist.
  9. Anordnung nach einem der Ansprüche 5-8, dadurch gekennzeichnet, dass die jeweiligen Metallbleche (14,15) am Bohrlochkopf (2') bzw. dem Rohrstrang (3') mittels Schraubenverbindungen befestigt sind.
  10. Anordnung nach einem der Ansprüche 1-9, dadurch gekennzeichnet, dass mindestens ein Dichtungsring (9) zusätzlich in die Verbindungsstruktur (13) mit eingeschlossen ist.
  11. Anordnung nach einem der Ansprüche 8-10, dadurch gekennzeichnet, dass ein Zwischenraum (d1) zwischen der peripheren Umfangsfläche (3d) des Rohrstrangflansches (3b) und der Innenfläche (2f) des Bohrlochkopfs (2') vorhanden ist.
  12. Anordnung nach einem der Ansprüche 7-11, dadurch gekennzeichnet, dass ein Zwischenraum (d2) zwischen der Außenfläche (3f) des Rohrstrangs (3') und der Innenfläche (2d) des Bohrlochkopfflansches (2b) vorhanden ist.
EP09703755.0A 2008-01-25 2009-01-21 Vorrichtung in einem kombinierten bohrlochkopf-/rohrstrang Active EP2245262B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20080477A NO328221B1 (no) 2008-01-25 2008-01-25 Anordning ved brønnhode
PCT/NO2009/000024 WO2009093911A1 (en) 2008-01-25 2009-01-21 A device in a combined wellhead/pipe string

Publications (3)

Publication Number Publication Date
EP2245262A1 EP2245262A1 (de) 2010-11-03
EP2245262A4 EP2245262A4 (de) 2015-07-08
EP2245262B1 true EP2245262B1 (de) 2017-09-20

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Application Number Title Priority Date Filing Date
EP09703755.0A Active EP2245262B1 (de) 2008-01-25 2009-01-21 Vorrichtung in einem kombinierten bohrlochkopf-/rohrstrang

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EP (1) EP2245262B1 (de)
NO (1) NO328221B1 (de)
WO (1) WO2009093911A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479552B (en) * 2010-04-14 2015-07-08 Aker Subsea Ltd Subsea wellhead providing controlled access to a casing annulus
NO331978B1 (no) 2010-06-22 2012-05-14 Neodrill As Anordning og framgangsmåte for stabilisering av et brønnhode, samt anvendelse av et sugefundament til understøttelse av et brønnhode
NO333368B1 (no) * 2010-10-12 2013-05-13 Vasshella As Styrestolpe
US20190194895A1 (en) * 2015-10-29 2019-06-27 Maersk Drilling A/S Methods and apparatus for forming an offshore well
GB201717634D0 (en) 2017-10-26 2017-12-13 Statoil Petroleum As Wellhead assembly installation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819967A (en) * 1983-02-14 1989-04-11 Vetco Gray Inc. Conductor tieback connector
US5028079A (en) * 1989-10-17 1991-07-02 J. M. Huber Corporation Non-crushing wellhead
US5029647A (en) * 1990-04-27 1991-07-09 Vetco Gray Inc. Subsea wellhead stabilization
US5662169A (en) 1996-05-02 1997-09-02 Abb Vetco Gray Inc. Cuttings injection wellhead system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2245262A4 (de) 2015-07-08
NO328221B1 (no) 2010-01-11
NO20080477L (no) 2009-07-27
EP2245262A1 (de) 2010-11-03
WO2009093911A1 (en) 2009-07-30

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