WO2018050636A1 - Appareil et procédé d'isolation de tête de puits - Google Patents

Appareil et procédé d'isolation de tête de puits Download PDF

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Publication number
WO2018050636A1
WO2018050636A1 PCT/EP2017/072888 EP2017072888W WO2018050636A1 WO 2018050636 A1 WO2018050636 A1 WO 2018050636A1 EP 2017072888 W EP2017072888 W EP 2017072888W WO 2018050636 A1 WO2018050636 A1 WO 2018050636A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
closure member
wellhead
lock
connector
Prior art date
Application number
PCT/EP2017/072888
Other languages
English (en)
Inventor
Jarle HVIDSTEN
Original Assignee
Vetco Gray Scandinavia As
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 Vetco Gray Scandinavia As filed Critical Vetco Gray Scandinavia As
Publication of WO2018050636A1 publication Critical patent/WO2018050636A1/fr

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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
    • 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

  • This invention relates to an apparatus and method for wellhead isolation.
  • wells are drilled to access subsurface hydrocarbon-bearing rock formations, the well boreholes typically then being lined ("cased") with sections of bore-lining tubing.
  • the well installation may include a wide variety of components which provide additional functionality, including amongst other things downhole safety valves, formation isolation sleeves, packers, plugs and the like.
  • the well borehole is typically drilled from an offshore platform or vessel which communicates with the wellhead located on the seabed via a riser.
  • a valve assembly known as a tree, is deployed and connected to the wellhead, the tree controlling access to/from the well via a system of valves and other components.
  • Well isolation equipment typically including one or more Blow Out Preventer ("BOP"), is installed on the valve assembly. Since well isolation equipment forms a critical safety component of the well installation, regular inspection, testing and refurbishment of the equipment is necessary.
  • BOP Blow Out Preventer
  • an intervention or workover operation may be required.
  • access to the well installation may involve removal of the well isolation equipment - requiring additional safety barriers to be emplaced to ensure sufficient redundancy.
  • a wellhead connector with a blind flange is typically mounted on the wellhead.
  • the wellhead connector is disconnected from the wellhead, whereafter other equipment can be placed on the well.
  • the wellhead will be exposed to the surrounding environment for some time after the connector is removed and before the new equipment is emplaced.
  • an apparatus for isolating a wellhead of a well installation comprising: a housing configured for coupling to the wellhead of the well installation, the housing comprising an axial throughbore; a closure member configured for location in an axial throughbore of the wellhead, the closure member comprising: a plug element configured to obturate the axial throughbore; and a lock for securing the closure member to the housing, wherein the closure member is configurable between an extended configuration in which the lock defines a radially extended position for securing the closure member to the housing and a retracted configuration in which the lock defines a radially retracted position, in which retracted configuration the closure member is moveable relative the housing.
  • embodiments of the present invention provide a wellhead isolation apparatus which maintains isolation of a wellhead while, for example, new wellhead isolation equipment is installed, since the closure member is capable of being deployed and/or retrieved without the requirement to first remove the wellhead isolation equipment.
  • the closure member may comprise a cap.
  • the closure member may comprise an internal cap.
  • the closure member may comprise a tree cap
  • the closure member may comprise an internal tree cap.
  • the closure member may be pre-installed in the housing.
  • the apparatus may be run with the closure member pre-installed.
  • the closure member is configurable between an extended configuration in which the lock defines a radially extended position for securing the closure member to the housing and a retracted configuration in which the lock defines a radially retracted position, in which retracted configuration the closure member is moveable relative the housing.
  • the apparatus may comprise a lock operator arrangement for reconfiguring the lock between the extended configuration and the retracted configuration.
  • the lock operator arrangement is coupled to, or forms part of, the closure member.
  • the lock operator arrangement may be configured so that axial movement of the lock operator arrangement in a first direction may reconfigure the apparatus from the extended configuration to the retracted configuration. For example, axial movement of the lock operator arrangement in the first direction may urge the lock, or allow the lock to move, to the retracted position.
  • the apparatus may be configured so that a pull force applied to the lock operator arrangement may reconfigure the apparatus from the extended configuration to the retracted configuration.
  • the lock operator arrangement may be configured so that axial movement of the lock operator arrangement in a second direction may reconfigure the apparatus from the retracted configuration to the extended configuration.
  • axial movement of the lock operator arrangement in the second direction may urge the lock, or allow the lock to move, to the extended position.
  • the apparatus may be configured so that a push force applied to the lock operator arrangement may reconfigure the apparatus from the retracted configuration to the extended configuration.
  • the lock operator arrangement may comprise a sleeve.
  • the sleeve may be pressed onto the lock to urge the lock to the extended configuration.
  • the sleeve may comprise a profile into which a retrieval tool can be connected.
  • the lock operator arrangement may comprise a retainer.
  • the retainer may comprise one or more protrusion. In use, pulling on the retainer may release the lock to permit the closure member to be retrieved.
  • the closure member is configurable between an extended configuration in which the lock defines a radially extended position for securing the closure member to the housing and a retracted configuration in which the lock defines a radially retracted position, in which retracted configuration the closure member is moveable relative the housing.
  • the lock may comprise one or more lock element.
  • the lock comprises a plurality of lock elements.
  • the lock elements may be circumferentially arranged.
  • the lock elements may be circumferentially spaced.
  • the one or more lock element may be configured to engage the housing.
  • the lock may comprise a taper lock.
  • one or more of the lock elements may comprise a wedge element.
  • the lock may comprise any suitable anchor.
  • the lock may comprise a rotational lock, one or more inflatable element.
  • the closure member may be secured by virtue of a clearance fit between the closure member and the housing.
  • the housing may be tubular in construction.
  • the housing may define a seat for receiving the closure member.
  • the seat may be disposed in the axial thoughbore of the housing.
  • the seat may be formed in the axial throughbore of the housing.
  • the housing may define a recess profile for receiving the closure member, the recess profile formed in the axial throughbore of the housing.
  • the housing may be configured for coupling at a first end to a wellhead.
  • the housing may be configured at a second end to receive well isolation equipment, such as a blow out preventor.
  • At least a portion of the axial throughbore of the housing may be configured to receive the closure member.
  • the axial throughbore may comprise a recess for receiving the closure member, in particular the lock.
  • the housing may comprise a single component.
  • the housing comprises a plurality of components.
  • the housing may comprise a first housing member.
  • the portion of the axial throughbore of the housing configured to receive the closure member may be provided in the first housing member.
  • the first housing member may define the seat for receiving the closure member.
  • the first housing member may define the recess profile for receiving the closure member.
  • the housing may comprise a second housing member.
  • the portion of the axial throughbore of the housing configured to receive the closure member may be provided in the second housing member.
  • the apparatus may comprise, or may be configured for coupling to, a wellhead connector.
  • the wellhead connector may be configured to connect the apparatus to the wellhead.
  • the wellhead connector may comprise a flange connector.
  • the wellhead connector may comprise a threaded flange connector.
  • the housing may be configured to couple to the wellhead connector.
  • the housing and the wellhead connector may be integrally formed.
  • the housing may be directly connected to the wellhead.
  • the wellhead connector may be tubular in construction.
  • the wellhead connector may comprise an axial throughbore.
  • the axial throughbore of the wellhead connector may communicate with the axial throughbore of the housing.
  • the axial throughbore of the wellhead connector may communicate with the wellhead (WH).
  • the housing may comprise a connector for connecting the housing to the wellhead connector.
  • the connector for connecting the housing to the wellhead connector may, for example, comprise one or more of a bolted flange connection, a welded connection, a threaded connection. It will be understood, however, that any suitable connector may be provided.
  • the housing may comprise a connector for connecting the housing to the well isolation equipment, such as a BOP or BOP stack.
  • the connector for connecting the housing to the well isolation equipment comprises a threaded connection.
  • an outer surface of the housing may comprise a thread profile for engaging a corresponding thread profile on the well isolation equipment. It will be understood, however, that any suitable connector may be provided.
  • the first housing member may comprise the connector for connecting the housing to the well isolation equipment.
  • the second housing member may comprise the connector for connecting the housing to the wellhead connector.
  • the closure member may be releasable from the housing, to facilitate retrieval of the closure member through the well isolation equipment.
  • the closure member in particular the lock, may be configured to be released by a tool, such as a release tool.
  • the apparatus may comprise a conveyance.
  • the conveyance may comprise a wire.
  • the conveyance may comprise landing equipment.
  • the conveyance may comprise one or more guide.
  • the guides may facilitate landing of the apparatus on the wellhead.
  • the apparatus may comprise a control panel, such an ROV control panel.
  • a kit of parts comprising: the housing of the first aspect; and the closure member of the first aspect.
  • a method for isolating a wellhead of a well installation using the apparatus of the first aspect is provided.
  • an apparatus for isolating a wellhead of a well installation comprising: a housing configured for coupling at a first end to a wellhead and configured at a second end to receive well isolation equipment, wherein the housing has an axial throughbore, at least a portion of the axial throughbore of the housing configured to receive a closure member for obturating the axial throughbore, to thereby isolate the wellhead of the well installation, and wherein the portion of the axial throughbore configured to receive the closure member has a diameter selected to correspond to a diameter of an axial throughbore of the well isolation equipment to be received on the housing, such that the closure member can be conveyed through the well isolation equipment.
  • embodiments of the present invention permit the closure member to be deployed into and/or retrieved from the apparatus without the requirement to remove the wellhead isolation equipment. Since the closure member can be deployed into and/or retrieved from the apparatus without the requirement to remove the wellhead isolation equipment, the surrounding environment is protected while, for example, new wellhead isolation equipment is installed.
  • the housing is configured for coupling at the first end to the wellhead.
  • the apparatus may comprise, or may be configured for coupling to, a wellhead connector.
  • the wellhead connector may be configured to connect the apparatus to the wellhead.
  • the wellhead connector may comprise a flange connector.
  • the wellhead connector may comprise a threaded flange connector.
  • the housing may be configured to couple to the wellhead connector.
  • the housing and the wellhead connector may be integrally formed.
  • the housing may be directly connected to the wellhead.
  • the wellhead connector may be tubular in construction.
  • the wellhead connector may comprise an axial throughbore.
  • the axial throughbore of the wellhead connector may communicate with the axial throughbore of the housing.
  • the axial throughbore of the wellhead connector may communicate with the wellhead (WH).
  • the housing may be tubular in construction.
  • the housing may define a seat for receiving the closure member.
  • the seat may be disposed in the axial thoughbore of the housing.
  • the seat may be formed in the axial throughbore of the housing.
  • the housing may define a recess profile for receiving the closure member, the recess profile formed in the axial throughbore of the housing.
  • the housing may comprise a connector for connecting the housing to the wellhead connector.
  • the connector for connecting the housing to the wellhead connector may, for example, comprise one or more of a bolted flange connection, a welded connection, a threaded connection. It will be understood, however, that any suitable connector may be provided.
  • the housing may comprise a connector for connecting the housing to the well isolation equipment, such as a BOP or BOP stack.
  • the connector for connecting the housing to the well isolation equipment comprises a threaded connection.
  • an outer surface of the housing may comprise a thread profile for engaging a corresponding thread profile on the well isolation equipment. It will be understood, however, that any suitable connector may be provided.
  • the housing may comprise a single component.
  • the housing comprises a plurality of components.
  • the housing may comprise a first housing member.
  • the portion of the axial throughbore of the housing configured to receive the closure member may be provided in the first housing member.
  • the first housing member may define the seat for receiving the closure member.
  • the first housing member may define the recess profile for receiving the closure member.
  • the first housing member may comprise the connector for connecting the housing to the well isolation equipment.
  • the housing may comprise a second housing member.
  • the second housing member may comprise the connector for connecting the housing to the wellhead connector.
  • the portion of the axial throughbore of the housing configured to receive the closure member may be provided in the second housing member.
  • the housing is configured to receive the closure member for obturating the axial throughbore.
  • the apparatus may comprise the closure member.
  • the closure member may be mountable in the housing.
  • the closure member may comprise a cap.
  • the closure member may comprise an internal cap.
  • the closure member may comprise a tree cap
  • the closure member may comprise an internal tree cap.
  • the closure member may comprise a plug element.
  • the closure member may comprise a lock.
  • the lock may be configured to secure the closure member to the housing.
  • the lock may comprise a taper lock. It will be understood, however, that the lock may comprise any suitable anchor.
  • the lock may comprise a rotational lock, one or more inflatable element.
  • closure member may be secured by virtue of a clearance fit between the closure member and the housing.
  • the lock may comprise one or more wedge element.
  • the one or more wedge element may be configured to engage the housing.
  • the one or more wedge element may be configured to engage the recess profile in the housing.
  • the closure member may be releasable from the housing, to facilitate retrieval of the closure member through the well isolation equipment.
  • the closure member in particular the lock, may be configured to be released by a tool, such as a release tool.
  • the closure member may comprise a sleeve.
  • the closure member may comprise a retainer.
  • the closure member may be pre-installed in the housing.
  • the apparatus may be run with the closure member pre-installed.
  • the closure member may be run with the apparatus. In other embodiments, the closure member may be provided separately from the apparatus.
  • closure member may be run separately from the apparatus.
  • the apparatus may comprise a conveyance.
  • the conveyance may comprise a wire.
  • the conveyance may comprise landing equipment.
  • the conveyance may comprise one or more guide.
  • the guides may facilitate landing of the apparatus on the wellhead.
  • the apparatus may comprise a control panel, such an ROV control panel.
  • kit of parts comprising the apparatus of the first aspect.
  • a method for isolating a wellhead of a well installation using the apparatus of the first aspect there is provided a method for isolating a wellhead of a well installation using the apparatus of the first aspect. It should be understood that the features defined above or described below may be utilised, either alone or in combination with any other defined or described feature.
  • Figure 1 shows an apparatus according to an embodiment of the present invention
  • Figure 2 shows a longitudinal cross-sectional view of the apparatus shown in Figure i ;
  • Figure 3 shows a cross-sectional view of a closure member
  • Figure 4 shows a wellhead isolation assembly including the apparatus shown in Figure 1 ;
  • Figure 5 shows a cross sectional view of the wellhead isolation assembly shown in Figure 3;
  • Figure 6 and 7 show diagrammatic views of hydraulic systems of the isolation assembly.
  • Figures 8 to 15 illustrate a method using the wellhead isolation assembly shown in Figures 4 and 5.
  • FIG. 1 there is shown an apparatus 10 according to an embodiment of the invention.
  • the apparatus 10 is configured for location on a subsea wellhead WH of a subsea well installation W (shown in Figures 8 to 15) and is configured to isolate the wellhead WH, as will be described further below.
  • the apparatus 10 comprises a housing 12.
  • the housing 12 is configured for coupling at a first end to the wellhead WH and is configured at a second end to receive well isolation equipment 14, in particular but not exclusively a blow out preventer stack (shown in Figure 1 1).
  • the housing 12 is generally tubular in construction having an axial throughbore 16. As will be described further below, a portion of the axial throughbore 16 of the housing 12 is configured to receive a closure member 18 - which in the illustrated embodiment comprises an internal tree cap - for obturating the axial throughbore 16, to thereby isolate the wellhead WH of the well installation W.
  • a closure member 18 - which in the illustrated embodiment comprises an internal tree cap - for obturating the axial throughbore 16, to thereby isolate the wellhead WH of the well installation W.
  • the portion of the axial throughbore 16 which receives the closure member 18 has a diameter selected to correspond to a diameter of an axial throughbore 20 (shown in Figure 12) of the well isolation equipment 14, such that the closure member 18 can be conveyed through the well isolation equipment.
  • the apparatus 10 permits the closure member 18 to be deployed into and/or retrieved from the apparatus 10 without the requirement to remove the wellhead isolation equipment 14. Since the closure member 18 can be deployed into and/or retrieved from the apparatus 10 without the requirement to remove the wellhead isolation equipment 14, the surrounding environment is protected while, for example, new wellhead isolation equipment is installed.
  • the closure member 18 is pre- installed in the housing 12. Beneficially, this permits the closure member 18 and/or the apparatus 10 to be tested onshore, e.g. prior to shipment, or on the intervention vessel V (shown in Figure 9 for example) e.g. prior to deployment.
  • the housing 12 comprises a first housing member 22 and a second housing member 24.
  • the first housing member 22 and second housing member 24 are sealingly coupled together.
  • the second housing member 24 - which forms the lower of the first and second housing members 22, 24 - is generally tubular in construction and defines a throughbore 26 which forms part of the throughbore 16.
  • the second housing member 24 takes the form of an extension mandrel.
  • the second housing member 24 couples the housing 12 to a wellhead connector 28.
  • the wellhead connector 28 is also generally tubular in construction and defines a throughbore 30 which forms part of the throughbore 16 of the housing 12.
  • the wellhead connector 28 is configured couple the apparatus 10 to the wellhead WH.
  • the wellhead connector 28 comprises a threaded flange 32.
  • the wellhead connector 28 defines a universal connection, and so can be fitted to existing wellheads of all types.
  • the first housing member 22 - which forms the upper of the first and second housing members 22, 24 - is generally in tubular in construction and defines a throughbore 34.
  • the first housing member 22 takes the form of an end section.
  • An outer surface portion of the first housing member 22 defines a thread profile 36 for receiving a corresponding thread profile (not shown) of the well isolation equipment 14.
  • An internal surface portion of the first housing member 22 comprises an internal recess profile 38 for engaging the closure member 18.
  • closure member 18 takes the form of a full bore internal tree cap.
  • the closure member 18 comprises a plug element 40 for obturating the axial throughbore 16, a lock sleeve 42, wedge elements 44 and a retainer 46.
  • the wedge elements 44 form a lock of the apparatus 10 for releasably securing the closure member 18 to the housing 12, while the lock sleeve 42 and the retainer 46 form a lock operator arrangement of the apparatus 10, axial movement of the lock operator arrangement in a first direction reconfiguring the apparatus 10 from an extended configuration to a retracted configuration.
  • the plug element 40 is wedged into the first housing member 22 by pressing the lock sleeve 42 onto the wedge elements 44 which are circumferentially arranged around the plug element 40.
  • a groove 46 is provided in the lock sleeve 42, into which a retrieval tool 14 (shown in Figure 12) can connect, as will be described further below.
  • the closure member 18 is configured so that when the lock sleeve 42 is pulled upwards by the retrieval tool 14, the wedge elements 44 are liberated.
  • the retainer 46 connects the plug element 40 and the lock sleeve 42 so that the complete closure member 18 is pulled out by the retrieval tool 42.
  • the assembly 100 comprises a conveyance 48 in the form of landing gear.
  • the conveyance 48 comprises a cable arrangement 50, a support frame 52 and guides 54 for engaging the wellhead WH.
  • FIGS 6 and 7 of the accompanying drawings show hydraulic subsystem systems 58, 60 comprising ROV operable valves 62 that can be operated by ROV hot stab in ROV receptacle 64.
  • the hydraulic system 58 is configured to facilitate pressure tests and monitoring capabilities under the closure member 18 by ROV hot stab.
  • the hydraulic system 54 can also be provided with by-pass capabilities.
  • the valves 62 can also be used for hydraulic opening and closing of the wellhead connector 28, as shown in Figure 7.
  • Figure 8 shows the wellhead WH prior to deployment of the assembly 100, and shows the wellhead WH after a Christmas tree (not shown) has been removed. As shown in Figure 8, the wellhead WH is shown without equipment mounted on the top, but with a temporary barrier 66 in place.
  • the assembly 100 - which in the illustrated embodiment include the closure member 18 pre- installed - is then deployed using the conveyance 48 and coupled to the wellhead WH, as shown in Figures 9 and 10.
  • the assembly 100 is constructed to fit all wellhead designs.
  • the assembly 100 is configured to fit all standard H4 VX wellheads without any additional interface requirements.
  • the plug element 40 is wedged into the first housing member 22 by pressing the lock sleeve 42 onto the wedge elements 44 which are circumferentially arranged around the plug element 40.
  • Figure 11 shows the well isolation equipment 14 - in the illustrated embodiment a BOP - landed on the assembly 100, and more particularly the first housing member 22.
  • the well isolation equipment 14 is coupled to the threaded connector 36; thereby provided a pressure tight coupling between the apparatus 10 and the well isolation equipment 14.
  • the assembly 100 is locked hydraulically by ROV hot stab.
  • pressure under the closure member 18 can be monitored from the control panel 56 or via a control system sensor (not shown) and/or can be bled, by virtue of the system shown in Figures 6 and 7.
  • the ROV hot stab to panel 52 is used to pressure test under the closure member 18.
  • the pressure under the closure member 18 can be monitored via ROV hot-stab and the receptacle 64.
  • the assembly 100 is designed for a 10 kpsi and 20 year design life.
  • the well installation W can be assessed at rig or intervention arrival. If the barrier provided by the apparatus 10 is considered safe, the assembly 100 can be removed and the well isolation equipment 14, for example BOP, installed in a similar manner to conventional isolation plugs.
  • Embodiments of the present invention provide the ability to remove the closure member 18 after the well isolation equipment 14, for example BOP, has been installed; without the requirement to remove the well isolation equipment 14 and obviating the additional infrastructure, tooling, personnel and expenditure that would require. This is particularly beneficial, for example, where there is a need for continuous control and plugging of the well installation W.
  • a tool 68 - in the illustrated embodiment a tubing hanger emergency retrieval tool known as a THERT - is run through the well isolation equipment 14.
  • the tool 68 is then latched onto closure member 18, as shown in Figure 13.
  • the tool 68 pulls the lock sleeve 42 upwards to liberate the wedge elements 44, to release. Since the retainer 46 connects the plug element 40 and the lock sleeve 42, the complete closure member 18 is pulled out by the retrieval tool 68.
  • FIG. 15 shows a longitudinal cross-sectional view of the wellhead WH where the closure member 18 removed.
  • the throughbore is now 18 3 ⁇ 4 inches, leaving no restrictions in the wellhead WH, such that subsequent casing pulling or side kick operations can continue without obstruction.
  • embodiments of the present invention permits the closure member 18 to be deployed into and/or retrieved from the apparatus 10 without the requirement to remove the wellhead isolation equipment 14. Since the closure member 18 can be deployed into and/or retrieved from the apparatus 10 without the requirement to remove the wellhead isolation equipment 14, the surrounding environment is protected while, for example, new wellhead isolation equipment is installed.
  • embodiments of the present invention may also provide significant time saving in plug and abandonment operations and well re-entry operations, as the closure member is utilised both as a cap and a plug.
  • Embodiments of the invention may also provide for tool-less installation.
  • Embodiments of the present invention also provide a number of additional advantages over conventional tools and equipment.
  • the apparatus permits full bore access, and so does not present a restriction to the passage of fluid or tooling.
  • the closure member can be recovered "tool-less" in open water, that is without the requirement for conventional running tools, and associated infrastructure.
  • the closure achieved by the apparatus can be tested and monitored by ROV hot stab.
  • the assembly can be retrieved if a new Christmas tree is to be installed. It can be recovered together with the well isolation equipment, for example BOP, if sufficient height is available in the intervention vessel's moon pool.
  • the apparatus can be recovered with the rest of wellhead assembly cut loose. It can be then recovered with a cart.
  • the wellhead isolation assembly can be used to secure integrity of temporary abandoned wells.
  • the wellhead isolation assembly comprises a wellhead cap or plug arrangement that can seal wellhead and can handle a BOP for re-entry.
  • plug assembly is applicable to wellhead assemblies such as subsea valve assemblies, such as Christmas trees or other subsea assemblies, where the use of such a plug could be suitable. It could also be used in other applications where there is a need for temporary isolation.

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  • 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)

Abstract

Cette invention concerne un appareil (10) d'isolation d'une tête de puits (WH) d'une installation de puits (W), comprenant un boîtier (12) ayant un raccord à une première extrémité pour l'accouplement à la tête de puits (WH) et un raccord à une seconde extrémité pour recevoir un équipement d'isolation de puits (14). Un alésage traversant axial (16) du boîtier (12) est configuré pour recevoir un élément de fermeture (18) pour obturer l'alésage axial traversant (16), afin d'isoler la tête de puits (WH) de l'installation de puits (W).
PCT/EP2017/072888 2016-09-14 2017-09-12 Appareil et procédé d'isolation de tête de puits WO2018050636A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20161461 2016-09-14
NO20161461 2016-09-14

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WO2018050636A1 true WO2018050636A1 (fr) 2018-03-22

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PCT/EP2017/072888 WO2018050636A1 (fr) 2016-09-14 2017-09-12 Appareil et procédé d'isolation de tête de puits

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049892A1 (fr) * 1996-06-27 1997-12-31 Expro North Sea Limited Arbre de noël
US20090071656A1 (en) * 2007-03-23 2009-03-19 Vetco Gray Inc. Method of running a tubing hanger and internal tree cap simultaneously
US20120193104A1 (en) * 2011-02-01 2012-08-02 Corey Eugene Hoffman Coiled tubing module for riserless subsea well intervention system
WO2014036215A1 (fr) * 2012-08-31 2014-03-06 Cameron International Corporation Système de bouchon pour équipement sous-marin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049892A1 (fr) * 1996-06-27 1997-12-31 Expro North Sea Limited Arbre de noël
US20090071656A1 (en) * 2007-03-23 2009-03-19 Vetco Gray Inc. Method of running a tubing hanger and internal tree cap simultaneously
US20120193104A1 (en) * 2011-02-01 2012-08-02 Corey Eugene Hoffman Coiled tubing module for riserless subsea well intervention system
WO2014036215A1 (fr) * 2012-08-31 2014-03-06 Cameron International Corporation Système de bouchon pour équipement sous-marin

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