EP2245262B1 - A device in a combined wellhead/pipe string - Google Patents
A device in a combined wellhead/pipe string Download PDFInfo
- 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
- Authority
- 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
Links
- 239000011159 matrix material Substances 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 241000446313 Lamella Species 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 230000033001 locomotion Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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)
Description
- 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.
- A wellhead system of the above described type is known from
US 5,662,169 . Another example of prior art isUS 5,028,079 . - Such welded wellheads have been installed at the sea bed in a number of locations around the world. Recently one has been aware that the combined wellhead and pipe string, at the point where the pipe string is set into the sea bead and the wellhead is welded to the top of the pipe string and projects from the sea bed, over time can result in fatigue in the weld joint between the pipe string and the wellhead.
- This results from the fact that the wellhead is subjected to alternating flexural or bending moments during drilling and other pipe string activity from a floating vessel and through a blow out preventer stack (BOP) installed at the top of the wellhead. This can be added to the motions of the vessel resulting from sea waves, oceanic currents, weather and wind. These alternating flexural moments are transferred from the wellhead, through the welded connection and further to the pipe string itself. The pipe string, however, is near completely restrained to the sea bed and has little chance to move. Since a weld connection is present, this inherently will mean that the weld between the pipe string and the wellhead constitutes the weak spot and forms a place for potential fatigue.
- In the Norwegian sector of the North Sea (NCS) this fatigue is calculated by using DnV RP C203 which provides the S/N curve C1 for through passing butt weld which is grinded on both sides.
- According to the present invention an assembly of the introductory kind is provided 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.
- In a preferred embodiment the joint comprises an elastomeric matrix located at the interface between the wellhead and the pipe string.
- In one embodiment the elastomeric matrix can include at least one embedded reinforcing lamella. Thus it will be possible to regulate load capacity and rigidity.
- The elastomeric matrix can be in the form of a rubber material, natural or synthetic, possibly resilient polymer material.
- Further the elastomeric matrix can be vulcanized, glued or similar to a sheet of metal which in turn is fixed to the wellhead.
- In turn the elastomeric matrix can be vulcanized, glued or similar to a sheet of metal which in turn is fixed to the pipe string.
- In one embodiment 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.
- In turn 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.
- In addition at least one sealing ring can be included in the joint structure in order to provide for pressure integrity between the pipes.
- Preferably 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.
- Further 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.
- Other and further objects, features and advantages will appear from the following description of a preferred embodiment of the invention, which is given for the purpose of description, and given in context with the appended drawings where:
-
Fig. 1 shows a longitudinal section through a conventional welded connection between a wellhead and a pipe string according to the prior art, -
Fig. 2 shows a longitudinal section through an exemplary embodiment of an articulated joint between the wellhead and the pipe string according to the invention, -
Fig. 3 shows in a top view an end flange of a pipe string, -
Fig. 4 shows a cross sectional view through the joint connection offig. 2 in enlarged scale, and -
Fig. 5 shows a further enlarged detailed view of the joint connection shown infigure 4 . - With reference to
figure 1 , thetraditional wellhead 2 according to the prior art is firstly shown. A first, large dimensionouter casing 8 is initially lowered into a well bore B in thesea bed 7. Typical diameter is 30". Thisouter 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. - Then the dimension of the drill bit is decreased and the drill bit is lowered through the first,
outer casing 8 down to the bottom of the first well bore B. The drilling is resumed and a well of several hundred meters is drilled with this reduced dimension. Then a second, nextouter casing 3 is lowered through theouter casing 8 and further down into the well bore with reduced dimension. Thecasings outer casing 3 terminates in awellhead 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 atermination part 1 at the end of theouter casing 8, whichtermination part 1 has corresponding, internal coupling means. Thewellhead 2 has anannular abutment 5 resting against an inside shoulder 5a formed internally of thetermination part 1. - The
wellhead 2 is traditionally welded to the top of thecasing 3 at a place indicated by thereference number 4 in the drawings. The weld is typically a butt weld grinded on both sides. Between theouter casing 8 and the secondouter casing 3 anannulus 6 is formed. Theannulus 6 is filled with cement C approximately up to theweld 4. Thetermination part 1 and thewellhead 2 projects from the sea bed as indicated by thereference 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. However, 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 infigure 1 have the same reference numbers, but with the addition of a mark'. - The combined wellhead/
pipe string assembly 10 is installed into thesea bed 7 in the very same way as illustrated infigure 1 . This means that the heaviest casing 8' is firstly cemented to the well bore before the casing 3' is cemented to the casing 8', fully corresponding to what is shown and described with reference tofigure 1 . - Briefly explained, an articulated "joint" is now introduced between the casing 3' and the wellhead 2'. This implies that the wellhead 2' is no longer able to transfer flexural moments to the casing 3', in the following generally termed pipe string 3'. However, the "joint" is able to transfer axially acting forces between the wellhead 2' and the pipe string 3'.
- 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'. Theelastomeric matrix 11 can be in the form of a rubber material, natural or synthetic, alternatively a polymer material. - In the illustrated embodiment the wellhead 2' has in its
lower end 2a an inwardly directedflange 2b. The radially inwardly directedflange 2b has an upwardly facingsurface 2c which forms a supporting surface for placement of theelastomeric matrix 11, as shown in further detail infigure 4 and 5 . - In turn, the pipe string 3' has in its
upper end 3a a radially outwardly directedflange 3b. The radially outwardly directedflange 3b has a downwardly facingsurface 3c which forms abutment surface for location of theelastomeric matrix 11, as shown in closer detail infigures 4 and 5 . -
Figure 3 shows the pipe string 3' viewed from above, in particular the outwardly directedflange 3b. - As illustrated in detail in
figures 4 and 5 , theelastomeric matrix 11 can in one embodiment include one or more embedded reinforcinglamellas 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 lowerannular reinforcing plate 14, an upperannular reinforcing plate 15 and theelastomeric matrix 11 located between the reinforcingplates plates matrix 11. One or more annular reinforcing plates, orlamellas 12, can possibly be vulcanized into theelastomeric matrix 11. The number and the size of the reinforcingplates 12 will be factors that dictate the load capacity and rigidity of the support elements 13. - Moreover, the support element 13 is secured to
respective flange surfaces apertures figures 3 and4 ) in theflanges plates - In order to obtain complete sealing integrity, one or more sealing rings 9 can be provided between the
respective flanges plates - In addition, as made clear in detailed
figure 5 , a clearance d1 is intentionally provided between the peripheralcircumferential surface 3d of thepipe string flange 3b and theinternal surface 2f of the wellhead 2'. A similar clearance d2 is present between theexternal surface 3f of the pipe string 3' and theinternal surface 2d of thewellhead 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. - As indicated in
figure 2 , the wellhead 2' according to the invention is assembled of two parts, an upper part and alower part 2a which are welded together as indicated by the weld seam w1. Correspondingly, theupper part 3a of the pipe string 3' is welded to the remainder of the pipe string by means of the weld seam w2 as indicated infigure 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'. - Thus it is to be understood that the
lower part 2a of the wellhead 2' needs to be installed within theupper part 3a of the pipe string 3', with the support element 13 between theflanges figure 4 , before the respective welds w1 and w2 can be performed. - This, however, may be prepared and pre welded at the workshop on shore, ready for later installation in the sea bed.
Claims (12)
- A combined wellhead (2'), outer casing (8) and pipe string (3') assembly (10), which outer casing (8) is designed to be installed in a well bore (B) in the sea bed (7) and the casing (8') is generally cemented to the sea bed formation, which wellhead (2'), in the installed state, is supported on the outer casing (8) via an annular abutment (5), this engagement then supporting the weight of the pipe string (3') within the outer casing (8), characterized in that an articulated joint (13) is introduced between the pipe string (3') and the wellhead (2'), which joint (13) is able to transfer axially acting forces at the same time as being unable to transfer bending moments between said pipe string (3') and said wellhead (2').
- The assembly as defined in claim 1, characterized in that said joint forms a supporting element which includes an elastomeric matrix (11) located at the interface between said wellhead (2') and the pipe string (3').
- The assembly as defined in claim 2, characterized in that said elastomeric matrix (11) includes at least one embedded reinforcing lamella (12), such as a plate of steel.
- The assembly as defined in claim 2 or 3, characterized in that said elastomeric matrix (11) is in the form of a rubber material, natural or synthetic, alternatively a polymer material.
- The assembly as defined in any of the claims 2-4, characterized in that said elastomeric matrix (11) is vulcanized, glued or similar to a sheet of metal (14) which in turn is fixed to the wellhead (2').
- The assembly as defined in any of the claims 2-5, characterized in that said elastomeric matrix (11) is vulcanized, glued or similar to a sheet of metal (15) which in turn is fixed to the pipe string (3').
- The assembly as defined in any of the claims 2-6, characterized in that said wellhead (2') has an radially inwardly directed flange (2b) having upwardly facing surface (2c) for placement of the elastomeric matrix (11), alternatively the sheet of metal (14).
- The assembly as defined in any of the claims 2-7, characterized in that said pipe string (3') has an radially outwardly directed flange (3b) having downwardly facing surface (3c) for abutment of the elastomeric matrix (11), alternatively the sheet of metal (15).
- The assembly as defined in any of the claims 5-8, characterized in that said respective sheets of metal (14, 15) is secured to the wellhead (2'), respectively the pipe string (3') by means of bolt connections.
- The assembly as defined in any of the claims 1-9, characterized in that at least one sealing ring (9) in addition is included in the joint structure (13).
- The assembly as defined in any of the claims 8-10, characterized in that a clearance (d1) is present between the peripheral circumferential surface (3d) of the pipe string flange (3b) and the internal surface (2f) of the wellhead (2').
- The assembly as defined in any of the claims 7-11, characterized in that a clearance (d2) is present between the external surface (3f) of the pipe string (3') and the internal surface (2d) of the wellhead flange (2b).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20080477A NO328221B1 (en) | 2008-01-25 | 2008-01-25 | Device at wellhead |
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 (en) | 2010-11-03 |
EP2245262A4 EP2245262A4 (en) | 2015-07-08 |
EP2245262B1 true EP2245262B1 (en) | 2017-09-20 |
Family
ID=40901299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09703755.0A Active EP2245262B1 (en) | 2008-01-25 | 2009-01-21 | A device in a combined wellhead/pipe string |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2245262B1 (en) |
NO (1) | NO328221B1 (en) |
WO (1) | WO2009093911A1 (en) |
Families Citing this family (5)
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 (en) | 2010-06-22 | 2012-05-14 | Neodrill As | Apparatus and method for stabilizing a wellhead, and using a suction foundation to support a wellhead |
NO333368B1 (en) * | 2010-10-12 | 2013-05-13 | Vasshella As | guidepost |
WO2017071709A2 (en) * | 2015-10-29 | 2017-05-04 | 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)
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 |
-
2008
- 2008-01-25 NO NO20080477A patent/NO328221B1/en unknown
-
2009
- 2009-01-21 WO PCT/NO2009/000024 patent/WO2009093911A1/en active Application Filing
- 2009-01-21 EP EP09703755.0A patent/EP2245262B1/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2009093911A1 (en) | 2009-07-30 |
NO328221B1 (en) | 2010-01-11 |
EP2245262A4 (en) | 2015-07-08 |
NO20080477L (en) | 2009-07-27 |
EP2245262A1 (en) | 2010-11-03 |
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