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WO1986001852A1 - Underwater well equipment - Google Patents

Underwater well equipment Download PDF

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Publication number
WO1986001852A1
WO1986001852A1 PCT/GB1985/000422 GB8500422W WO8601852A1 WO 1986001852 A1 WO1986001852 A1 WO 1986001852A1 GB 8500422 W GB8500422 W GB 8500422W WO 8601852 A1 WO8601852 A1 WO 8601852A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubing hanger
tree
tubing
well head
tree body
Prior art date
Application number
PCT/GB1985/000422
Other languages
French (fr)
Inventor
Peter John Doyle
Anthony Frank Pipe
Original Assignee
Britoil Plc
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 Britoil Plc filed Critical Britoil Plc
Priority to BR8506922A priority Critical patent/BR8506922A/en
Publication of WO1986001852A1 publication Critical patent/WO1986001852A1/en
Priority to FI861984A priority patent/FI861984A0/en
Priority to DK218086A priority patent/DK218086A/en

Links

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
    • E21B33/04—Casing heads; Suspending casings or tubings in well heads
    • E21B33/047—Casing heads; Suspending casings or tubings in well heads for plural tubing strings
    • 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
    • E21B33/0353—Horizontal or spool trees, i.e. without production valves in the vertical main bore

Definitions

  • This invention relates to underwater well head equipment, and in particular to a novel tree.
  • the tubing hanger In conventional well heads, the tubing hanger is seated in the well head body, onto which the tree is mounted. This arrangement has numerous practical disadvantages: the size of the valves in the tree is determined by the size of the tubing and tubing hanger, and access to electrical and hydraulic connectors for downhole equipment is difficult.
  • a tree system produced by National Supply consists of a production upper body, a well head connector, and a main tree body.
  • the upper body carries the well head connector, tubing hanger landing profile, and tubing hanger lockdown system. It is ported for downhole safety valve control line, and a side-entry annulus connection. It allows unrestricted passage for downhole tubing and associated equipment. Tree valves are situated above the tubing hanger. This system has a number of disadvantages.
  • valve actuators are large; sealing surfaces in the tree are liable to damage during installation of the tubing; the system does not lend itself readily to vertical annulus access or dual-string arrangements; the provision of extra downhole facilities is not readily provided for; there is only limited space at the interface between the tubing hanger and tree, which hampers the provision of downhole equipment connectors such as electrical instrumentation contacts; there is a risk of contamination of downhole safety valve control lines; high point loadings can arise at the tree/tubing hanger interface.
  • the Hydril completion diverter has a diverter valve above the tubing hanger, which can be set to divert flow laterally through master valves, or alternatively can permit straight-through vertical access.
  • the diverter valve contains an insert which can be removed to provide large-diameter vertical access so that the tubing hanger, tubing and packer can be run through the valve.
  • conventional-sized valves and actuators can be used and valves can be integrated with the tree body.
  • the relatively complex, diverter valve arrangement requires special sealing at the tubing hanger and ball valve interface, and sealing faces and seals may be prone to damage during installation or workover operations if the valve ball is not correctly aligned. Owing to limited space and the movement of the valve ball, the provision of hydraulic and electrical connections for downhole equipment at the interface between the tree and tubing hanger is not easy.
  • An object of the present invention is to provide an arrangement in which through vertical access of full diameter is provided, and electrical and hydraulic connections for downhole equipment can be provided relatively easily, in a simple and reliable structure.
  • the tubing hanger is seated in the tree body. Access to the tubing is laterally, through passages provided in the tubing hanger and tree body.
  • the tubing hanger can also provide in-line vertical access to the tubing.
  • the upper end of the tubing hanger is at or near an upper surface of the tree body, providing a readily accessible interface for connections of various kinds.
  • Figure 1 is a vertical section through a well head and tree assembly embodying the invention
  • Figure 2 shows, on a larger scale, a possible multi-string tubing hanger.
  • Figure 1 shows a conventional well head 1 and a conventional casing 2.
  • a tree body 3 embodying the invention is mounted on the well head by a connector 4.
  • a tubing hanger 5 is seated on a load bearing shoulder 6 in the tree body, so that the tubing hanger is housed in the upper part of the tree body.
  • the tubing hanger has a cross-ported manifolded top section which forms part of the tubing hanger body, which in turn is an integral part of the downhole tubing 7. It is provided with main seals 8 to seal it in the cylindrical seat in which it is located in the tree body.
  • the tubing hanger has an axial through passage 9 of the same diameter as the tubing.
  • the passage 9 communicates with lateral ports 10 which in turn communicate with outlet ports 11 in the tree body.
  • the bore 9 is normally closed above the ports 10, by a crown plug 12. During normal operation, produced or injected fluid is diverted through 90°. through the outlet ports 11 in the tree body.
  • the seals 8 required to isolate the ports are installed with the tubing hanger assembly.
  • the tubing hanger and tree body are provided with a hanger orientation cam and slot arrangement 13.
  • a non-orienting system may be used to instal the tubing assembly into the tree body.
  • an orientation mechanism is of course essential.
  • the tree body provides the load bearing seat 6, the lock down system 24 and mating sealing faces for the tubing hanger, and is provided with the fluid ports and production wing and crossover valves as necessary.
  • Figure 1 shows master valves 14 and an annulus crossover valve 15 providing communication with the well annulus, and vertical or horizontal actuators 25.
  • the tree body may be configured to permit vertical mounting of valves, actuator and flowline connections, thereby simplifying subsea installation and removal of such components.
  • the lower half of the tree body is configured to mate with the well head, while the top of the tree body interfaces with the primary tree cap 16 or, during workover, with the BOP and main riser system.
  • valves in the tree body provides protection from external damage. There is no need for the conventional separate tree insert, and it is not necessary to use large valves or actuators, regardless of the casing size or the outside diameter of the tubing hanger. For example, conventional three inch valves can be used.
  • the tree cap unlike conventional arrangements, is split into two sections.
  • the main or primary section 16 interfaces with the tree body 3 and provides secondary load and pressure containment of the tubing hanger.
  • the secondary tree cap 17 which is mounted onto and forms part of the primary tree cap, provides a smaller access and mounting location for a small wireline BOP system thus simplifying requirements for general wireline workover and re-entry.
  • a swab valve 18 mounted in the primary cap section ensures additional safety during the wireline operation and secondary tree cap removal. This is backed up by the wireline removable crown plug 12 in the top entry part of the tubing hanger manifold body.
  • the upper end face of the tubing hanger is very close to the top of the tree body, where it forms an interface with the primary tree cap 16. At this interface, electrical connectors 19 and hydraulic connectors 20 are provided. This provides an improved environment for instrument and downhole pump electrical connectors, and better access to such connectors, to permit diver, ROV or self-aligning coupler make-up after the tree body has been installed.
  • FIG. 2 shows a tubing hanger 5a with primary and secondary seals 8and adjoining parts of the tree body 3a and primary tree cap 16a, for an installation comprising two production strings 21 as well as electrical instrument cables and lines 22. and hydraulic lines 23 to a downhole pump.
  • the configuration proposed is ideal for single satellite and twin cluster well applications. It can also be modified for use with TFL systems and top entry fluid connection systems such as may be required on a template/manifold application.
  • the proposed tree fulfils two functions necessary for economical and efficient subsea oil production. These functions are : - The ability to remove the downhole tubing system and its components without disturbing the tree and its associated interfaces. - The ability to accommodate tubing assemblies for multizone production and TFL servicing plus downhole equipment such as gas lift valves, artificial lift pumps and electronic instrumentation.
  • - Can be configured for use as single satellite tree or as an integral installation on a template/manifold system. - Can be adapted for platform use.

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)
  • Earth Drilling (AREA)
  • Telephone Function (AREA)

Abstract

An underwater well head (1) is provided with a tree body (3) in which a tubing hanger (5) is directly seated and housed. The tubing hanger has lateral supports (10) aligned with ports (11) in the tree body, and control valves (14, 15) are mounted directly in the tree body. The tubing hanger also has a vertical through passage (9) of the same diameter as the tubing (7), for providing in-line access, normally closed by a crown plug (20). In normal operation, produced or injected fluid passes through the ports (11), sealing being provided by upper and lower peripheral seals (8) on the tubing hanger. Above the tubing hanger is primary tree cap (16) with electrical and hydraulic connectors interfacing with the tubing hanger. On the primary cap (16) is a workover cap (17) providing for wire line access.

Description

"UNDERWATER WELL EQUIPMENT"
This invention relates to underwater well head equipment, and in particular to a novel tree.
In conventional well heads, the tubing hanger is seated in the well head body, onto which the tree is mounted. This arrangement has numerous practical disadvantages: the size of the valves in the tree is determined by the size of the tubing and tubing hanger, and access to electrical and hydraulic connectors for downhole equipment is difficult.
There is a requirement for a well head and tree system which will allow through-tree tubing operation.
A tree system produced by National Supply consists of a production upper body, a well head connector, and a main tree body. The upper body carries the well head connector, tubing hanger landing profile, and tubing hanger lockdown system. It is ported for downhole safety valve control line, and a side-entry annulus connection. It allows unrestricted passage for downhole tubing and associated equipment. Tree valves are situated above the tubing hanger. This system has a number of disadvantages. The valve actuators are large; sealing surfaces in the tree are liable to damage during installation of the tubing; the system does not lend itself readily to vertical annulus access or dual-string arrangements; the provision of extra downhole facilities is not readily provided for; there is only limited space at the interface between the tubing hanger and tree, which hampers the provision of downhole equipment connectors such as electrical instrumentation contacts; there is a risk of contamination of downhole safety valve control lines; high point loadings can arise at the tree/tubing hanger interface.
The Hydril completion diverter has a diverter valve above the tubing hanger, which can be set to divert flow laterally through master valves, or alternatively can permit straight-through vertical access. The diverter valve contains an insert which can be removed to provide large-diameter vertical access so that the tubing hanger, tubing and packer can be run through the valve. With this system, conventional-sized valves and actuators can be used and valves can be integrated with the tree body. However, the relatively complex, diverter valve arrangement requires special sealing at the tubing hanger and ball valve interface, and sealing faces and seals may be prone to damage during installation or workover operations if the valve ball is not correctly aligned. Owing to limited space and the movement of the valve ball, the provision of hydraulic and electrical connections for downhole equipment at the interface between the tree and tubing hanger is not easy.
An object of the present invention is to provide an arrangement in which through vertical access of full diameter is provided, and electrical and hydraulic connections for downhole equipment can be provided relatively easily, in a simple and reliable structure.
According to the present invention, the tubing hanger is seated in the tree body. Access to the tubing is laterally, through passages provided in the tubing hanger and tree body. The tubing hanger can also provide in-line vertical access to the tubing.
Preferably, the upper end of the tubing hanger is at or near an upper surface of the tree body, providing a readily accessible interface for connections of various kinds.
The present invention is illustrated by the accompanying drawings in which : Figure 1 is a vertical section through a well head and tree assembly embodying the invention, and
Figure 2 shows, on a larger scale, a possible multi-string tubing hanger.
Figure 1 shows a conventional well head 1 and a conventional casing 2. A tree body 3 embodying the invention is mounted on the well head by a connector 4.
A tubing hanger 5 is seated on a load bearing shoulder 6 in the tree body, so that the tubing hanger is housed in the upper part of the tree body.
The tubing hanger has a cross-ported manifolded top section which forms part of the tubing hanger body, which in turn is an integral part of the downhole tubing 7. It is provided with main seals 8 to seal it in the cylindrical seat in which it is located in the tree body.
The tubing hanger has an axial through passage 9 of the same diameter as the tubing. In the lower part of the tubing hanger, between upper and lower main seals 8, the passage 9 communicates with lateral ports 10 which in turn communicate with outlet ports 11 in the tree body. The bore 9 is normally closed above the ports 10, by a crown plug 12. During normal operation, produced or injected fluid is diverted through 90°. through the outlet ports 11 in the tree body. The seals 8 required to isolate the ports are installed with the tubing hanger assembly.
The tubing hanger and tree body are provided with a hanger orientation cam and slot arrangement 13. For a single string installation, a non-orienting system may be used to instal the tubing assembly into the tree body. For multi-string use. an orientation mechanism is of course essential.
The tree body provides the load bearing seat 6, the lock down system 24 and mating sealing faces for the tubing hanger, and is provided with the fluid ports and production wing and crossover valves as necessary. Figure 1 shows master valves 14 and an annulus crossover valve 15 providing communication with the well annulus, and vertical or horizontal actuators 25. The tree body may be configured to permit vertical mounting of valves, actuator and flowline connections, thereby simplifying subsea installation and removal of such components.
The lower half of the tree body is configured to mate with the well head, while the top of the tree body interfaces with the primary tree cap 16 or, during workover, with the BOP and main riser system.
Mounting the valves in the tree body provides protection from external damage. There is no need for the conventional separate tree insert, and it is not necessary to use large valves or actuators, regardless of the casing size or the outside diameter of the tubing hanger. For example, conventional three inch valves can be used.
The tree cap, unlike conventional arrangements, is split into two sections. The main or primary section 16, interfaces with the tree body 3 and provides secondary load and pressure containment of the tubing hanger. When tubing removal is necessary the primary cap is removed and replaced with the BOP and riser assembly. The secondary tree cap 17, which is mounted onto and forms part of the primary tree cap, provides a smaller access and mounting location for a small wireline BOP system thus simplifying requirements for general wireline workover and re-entry. A swab valve 18 mounted in the primary cap section ensures additional safety during the wireline operation and secondary tree cap removal. This is backed up by the wireline removable crown plug 12 in the top entry part of the tubing hanger manifold body. The upper end face of the tubing hanger is very close to the top of the tree body, where it forms an interface with the primary tree cap 16. At this interface, electrical connectors 19 and hydraulic connectors 20 are provided. This provides an improved environment for instrument and downhole pump electrical connectors, and better access to such connectors, to permit diver, ROV or self-aligning coupler make-up after the tree body has been installed.
An analogous construction can be used for a multi-string installation. By way of example only. Figure 2 shows a tubing hanger 5a with primary and secondary seals 8and adjoining parts of the tree body 3a and primary tree cap 16a, for an installation comprising two production strings 21 as well as electrical instrument cables and lines 22. and hydraulic lines 23 to a downhole pump.
The configuration proposed is ideal for single satellite and twin cluster well applications. It can also be modified for use with TFL systems and top entry fluid connection systems such as may be required on a template/manifold application.
As the tree permits a high level of functions at the tubing hanger interface the benefit of multizone production, artificial lift and improved instrumentation accommodation could be employed for platform based wells.
The proposed tree fulfils two functions necessary for economical and efficient subsea oil production. These functions are : - The ability to remove the downhole tubing system and its components without disturbing the tree and its associated interfaces. - The ability to accommodate tubing assemblies for multizone production and TFL servicing plus downhole equipment such as gas lift valves, artificial lift pumps and electronic instrumentation.
Obviously the more complex the downhole system becomes the more likely it is that servicing will be necessary.. The ability to remove and service the equipment quickly and easily is therefore essential. The configuration proposed covers these aspects.
A summary of the features of the proposed design is as follows :
- Permits safe withdrawal of tubing and hanger without removing the tree, thus allowing complex downhole equipment requiring regular maintenance to be used. - Permits any size of tree valve to be used regardless of the tubing and casing size.
- As the tree valves do not govern the size of the tubing hanger its size may be increased to accommodate any number of downhole tubing strings. Similarly the areas required to mount electrical and hydraulic connectors for downhole equipment, can be provided. - Provides good access to the mounting interface with electrical, instrumentation hydraulic and downhole service connections. - Permits use of standard BOP and riser assemblies.
- Permits orientation of tubing. - Offers a low tree profile. - Permits vertical positioning of valves and connectors to assist in subsea intervention, installation or removal. - Allows safe disconnection of the tree cap.
- Can be configured for use as single satellite tree or as an integral installation on a template/manifold system. - Can be adapted for platform use.
Vertical access to the annulus is also obviously possible. - As the tree cap is divided into two sections the use of a smaller wireline BOP is possible thus eliminating heavy equipment requirements for routine surface vessel intervention.

Claims

CLAIMS :
1. A well head comprising a tree body, a well tubing hanger seated in the tree body, and at least one lateral passage provided in the tree body and in the tubing hanger providing access to the tubing.
2. A well head according to claim 1 in which the tubing hanger provides direct in-line vertical access to the tubing.
3. A well head as claimed in claim 1 or 2 in which the upper end of the tubing hanger is at or adjacent an upper surface of the tree body.
4. A well head as claimed in claim 1. 2 or 3 in which the tubing hanger is provided with peripheral seals above and below the lateral access passage or passages.
5. A well head as claimed in any preceding claim, in which flow control valves for produced or injected fluid are provided within the tree body.
6. A well head as claimed in any preceding claim having a tree cap. which cap comprises two portions of which a primary portion interfaces with the tree body and provides containment for the tubing hanger, and a secondary portion mounted on the primary portion and adapted to provide for wireline access.
7. A well head as claimed in claim 6 having electrical and/or hydraulic connecting means at an interface between the primary portion of the cap and the upper end face of the tubing hanger.
8. A well head, substantialy as herein described with reference to Figure 1 or Figure 2 of the accompanying drawings.
PCT/GB1985/000422 1984-09-12 1985-09-12 Underwater well equipment WO1986001852A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR8506922A BR8506922A (en) 1984-09-12 1985-09-12 POCO HEAD
FI861984A FI861984A0 (en) 1984-09-12 1986-05-12 UTRUSTNING FOER UNDERVATTENSBRUNN.
DK218086A DK218086A (en) 1985-09-12 1986-05-12 UNDER WATER PIPES SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8422975 1984-09-12
GB08422975A GB2166775B (en) 1984-09-12 1984-09-12 Underwater well equipment

Publications (1)

Publication Number Publication Date
WO1986001852A1 true WO1986001852A1 (en) 1986-03-27

Family

ID=10566588

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1985/000422 WO1986001852A1 (en) 1984-09-12 1985-09-12 Underwater well equipment

Country Status (7)

Country Link
EP (1) EP0192768A1 (en)
AU (1) AU4951085A (en)
BR (1) BR8506922A (en)
FI (1) FI861984A0 (en)
GB (1) GB2166775B (en)
NO (1) NO861887L (en)
WO (1) WO1986001852A1 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899822A (en) * 1987-09-04 1990-02-13 Camco Inc. Apparatus for controlling the operation of an underwater installation
EP0499547A1 (en) * 1991-02-14 1992-08-19 Elf Aquitaine Production Underwater wellhead
EP0572732A1 (en) * 1992-06-01 1993-12-08 Cooper Cameron Corporation Wellhead
US5992527A (en) * 1996-11-29 1999-11-30 Cooper Cameron Corporation Wellhead assembly
US6076605A (en) * 1996-12-02 2000-06-20 Abb Vetco Gray Inc. Horizontal tree block for subsea wellhead and completion method
US6200152B1 (en) 1992-06-01 2001-03-13 Cooper Cameron Corporation Electrical connection
US6367551B1 (en) 1998-12-18 2002-04-09 Abb Vetco Gray Incorporated Monobore riser
US6675900B2 (en) 2000-01-27 2004-01-13 David C. Baskett Crossover tree system
US6715554B1 (en) * 1997-10-07 2004-04-06 Fmc Technologies, Inc. Slimbore subsea completion system and method
US6810954B2 (en) 2000-01-27 2004-11-02 Kvaerner Oilfield Products, Inc. Production flow tree cap
US6923273B2 (en) 1997-10-27 2005-08-02 Halliburton Energy Services, Inc. Well system
WO2009139721A1 (en) * 2008-05-12 2009-11-19 Aker Solutions Singapore Pte Ltd Dual tubing hanger
NO344103B1 (en) * 2008-05-28 2019-09-02 Vetco Gray Inc Submarine wellhead
WO2020013706A1 (en) * 2018-07-12 2020-01-16 New Subsea Technology As Improvements in completing wells
CN119981752A (en) * 2025-04-10 2025-05-13 苏州道森钻采设备有限公司 An integrated underwater oil production wellhead device

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GB2286840B (en) * 1994-02-10 1997-09-03 Fmc Corp Safety valve for horizontal tree
US5865250A (en) 1994-08-23 1999-02-02 Abb Vetco Gray Inc. Fluid connector with check valve and method of running a string of tubing
GB9604803D0 (en) * 1996-03-07 1996-05-08 Expro North Sea Ltd High pressure tree cap
GB2311312B (en) * 1996-03-19 1998-03-04 Allan Cassells Sharp Method and apparatus for simultaneous production and injection operations in a single well
US6062314A (en) * 1996-11-14 2000-05-16 Abb Vetco Gray Inc. Tubing hanger and tree with horizontal flow and annulus ports
GB2346630B (en) * 1999-02-11 2001-08-08 Fmc Corp Flow control package for subsea completions
GB2352258B (en) * 1999-07-22 2003-09-17 Plexus Ocean Syst Ltd A wellhead arrangement
CA2328666A1 (en) * 2000-01-11 2001-07-11 Cooper Cameron Corporation Wellhead assembly
US7025132B2 (en) 2000-03-24 2006-04-11 Fmc Technologies, Inc. Flow completion apparatus
WO2001073257A1 (en) * 2000-03-24 2001-10-04 Fmc Corporation Tubing head seal assembly
GB2361726B (en) 2000-04-27 2002-05-08 Fmc Corp Coiled tubing line deployment system
GB2376487B (en) * 2001-06-15 2004-03-31 Schlumberger Holdings Power system for a well
US7909103B2 (en) * 2006-04-20 2011-03-22 Vetcogray Inc. Retrievable tubing hanger installed below tree
GB2472738B (en) * 2006-08-18 2011-05-18 Cameron Int Corp Wellhead assembly
CN103582740A (en) * 2011-06-17 2014-02-12 Bp北美公司 Air-freightable containment cap for containing a subsea well
US9903173B1 (en) * 2016-11-30 2018-02-27 Cameron International Corporation Connection for a pressurized fluid flow path

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US2889886A (en) * 1956-01-23 1959-06-09 Jay P Gould Well head
US3451481A (en) * 1966-06-09 1969-06-24 Rockwell Mfg Co Dual suspension and seal
US3454084A (en) * 1967-10-10 1969-07-08 Otis Eng Corp Well head closure assembly
US3638732A (en) * 1970-01-12 1972-02-01 Vetco Offshore Ind Inc Underwater wellhead electric connection apparatus for submerged electric motor driven well pumps and method of installation

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899822A (en) * 1987-09-04 1990-02-13 Camco Inc. Apparatus for controlling the operation of an underwater installation
EP0499547A1 (en) * 1991-02-14 1992-08-19 Elf Aquitaine Production Underwater wellhead
FR2672935A1 (en) * 1991-02-14 1992-08-21 Elf Aquitaine UNDERWATER WELL HEAD.
US5213162A (en) * 1991-02-14 1993-05-25 Societe Nationale Elf Aquitaine (Production) Submarine wellhead
AU664634B2 (en) * 1992-06-01 1995-11-23 Cooper Cameron Corporation Wellhead
US7314086B2 (en) * 1992-06-01 2008-01-01 Cameron International Corporation Well operations system
US7308943B2 (en) 1992-06-01 2007-12-18 Cameron International Corporation Well operations system
EP0719905A1 (en) * 1992-06-01 1996-07-03 Cooper Cameron Corporation Wellhead
US5544707A (en) * 1992-06-01 1996-08-13 Cooper Cameron Corporation Wellhead
US7093660B2 (en) 1992-06-01 2006-08-22 Cooper Cameron Corporation Well operations system
US6039119A (en) * 1992-06-01 2000-03-21 Cooper Cameron Corporation Completion system
US7314085B2 (en) 1992-06-01 2008-01-01 Cameron International Corporation Well operations system
EP0989283A3 (en) * 1992-06-01 2000-10-11 Cooper Cameron Corporation Wellhead
US6200152B1 (en) 1992-06-01 2001-03-13 Cooper Cameron Corporation Electrical connection
EP0572732A1 (en) * 1992-06-01 1993-12-08 Cooper Cameron Corporation Wellhead
US6547008B1 (en) 1992-06-01 2003-04-15 Cooper Cameron Corporation Well operations system
EP1233145A3 (en) * 1992-06-01 2003-08-27 Cooper Cameron Corporation Wellhead Assembly
WO1993024730A1 (en) * 1992-06-01 1993-12-09 Cooper Industries, Inc. Wellhead
US5992527A (en) * 1996-11-29 1999-11-30 Cooper Cameron Corporation Wellhead assembly
US6076605A (en) * 1996-12-02 2000-06-20 Abb Vetco Gray Inc. Horizontal tree block for subsea wellhead and completion method
US6715554B1 (en) * 1997-10-07 2004-04-06 Fmc Technologies, Inc. Slimbore subsea completion system and method
US6923273B2 (en) 1997-10-27 2005-08-02 Halliburton Energy Services, Inc. Well system
US7172038B2 (en) 1997-10-27 2007-02-06 Halliburton Energy Services, Inc. Well system
US6367551B1 (en) 1998-12-18 2002-04-09 Abb Vetco Gray Incorporated Monobore riser
US6681852B2 (en) 2000-01-27 2004-01-27 Kvaerner Oilfield Products, Inc. Tubing hanger shuttle valve
US6810954B2 (en) 2000-01-27 2004-11-02 Kvaerner Oilfield Products, Inc. Production flow tree cap
US6675900B2 (en) 2000-01-27 2004-01-13 David C. Baskett Crossover tree system
WO2009139721A1 (en) * 2008-05-12 2009-11-19 Aker Solutions Singapore Pte Ltd Dual tubing hanger
GB2472173A (en) * 2008-05-12 2011-01-26 Aker Solutions Singapore Pte Ltd Dual tubing hanger
GB2472173B (en) * 2008-05-12 2012-09-05 Aker Solutions Singapore Pte Ltd Dual tubing hanger
CN102171410B (en) * 2008-05-12 2014-04-02 阿科尔溶液新加坡有限公司 Dual tubing hanger
NO344103B1 (en) * 2008-05-28 2019-09-02 Vetco Gray Inc Submarine wellhead
WO2020013706A1 (en) * 2018-07-12 2020-01-16 New Subsea Technology As Improvements in completing wells
GB2589753A (en) * 2018-07-12 2021-06-09 New Subsea Tech As Improvements in completing wells
GB2589753B (en) * 2018-07-12 2022-12-07 New Subsea Tech As Improvements in completing wells
US11719064B2 (en) 2018-07-12 2023-08-08 New Subsea Technology As Completing wells
CN119981752A (en) * 2025-04-10 2025-05-13 苏州道森钻采设备有限公司 An integrated underwater oil production wellhead device

Also Published As

Publication number Publication date
EP0192768A1 (en) 1986-09-03
NO861887L (en) 1986-07-04
GB8422975D0 (en) 1984-10-17
GB2166775B (en) 1987-09-16
AU4951085A (en) 1986-04-08
GB2166775A (en) 1986-05-14
BR8506922A (en) 1986-12-23
FI861984A7 (en) 1986-05-12
FI861984A0 (en) 1986-05-12

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