EP3551837A1 - Déconnexion explosive - Google Patents

Déconnexion explosive

Info

Publication number
EP3551837A1
EP3551837A1 EP17877949.2A EP17877949A EP3551837A1 EP 3551837 A1 EP3551837 A1 EP 3551837A1 EP 17877949 A EP17877949 A EP 17877949A EP 3551837 A1 EP3551837 A1 EP 3551837A1
Authority
EP
European Patent Office
Prior art keywords
connector
marine riser
blowout preventer
riser package
lower marine
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.)
Withdrawn
Application number
EP17877949.2A
Other languages
German (de)
English (en)
Other versions
EP3551837A4 (fr
Inventor
Bobby James GALLAGHER
Steven Anthony ANGSTMANN
Billy Jack GALLAGHER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kinetic Pressure Control Ltd
Original Assignee
Kinetic Pressure Control Ltd
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 Kinetic Pressure Control Ltd filed Critical Kinetic Pressure Control Ltd
Publication of EP3551837A1 publication Critical patent/EP3551837A1/fr
Publication of EP3551837A4 publication Critical patent/EP3551837A4/fr
Withdrawn legal-status Critical Current

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
    • E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
    • E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
    • 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
    • E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
    • E21B33/064—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers specially adapted for underwater well heads
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
    • E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams

Definitions

  • This disclosure relates to the field of well pressure control apparatus. More particularly, the disclosure relates to methods and devices for quickly disconnecting a lower marine riser package (LMRP) or other device from a well pressure control device coupled to a subsea wellhead.
  • LMRP lower marine riser package
  • Marine wellbore drilling techniques known in the art include the use of a pressure control apparatus such as a blowout preventer ("BOP") disposed proximate the water bottom and coupled to the upper end of a surface conduit or casing disposed in the well (e.g., a "wellhead").
  • BOP blowout preventer
  • Shear rams may be provided to enable cutting through conduit and/or drilling tools disposed within the interior bore in the BOP housing and subsequently closing to hydraulically isolate the well below the shear rams.
  • Annular seals may be used where it is desired to hydraulically isolate the well while enabling a conduit such as drill pipe, or other drilling tools to pass through the interior bore of the BOP housing.
  • Each of the foregoing ram-type pressure control elements may be disposed in opposed pairs on the BOP housing and may be operated by respective hydraulic ram actuators, e.g., pistons disposed in respective cylinders.
  • Hydraulic fluid pressure to operate the various ram-type pressure control elements and/or the annular seal may be controlled by an hydraulic fluid line extending from a control valve manifold to a drilling platform on the water surface, and by providing a plurality of accumulators each having hydraulic fluid and gas (e.g., nitrogen) under pressure to supply a relatively large volume of fluid rapidly in the event it becomes necessary to close any one or more of the pressure control elements in the BOP.
  • the accumulators also can supply hydraulic fluid even in the event the hydraulic fluid line to the surface becomes blocked or disconnected.
  • a plurality of the foregoing types of pressure control elements may be connected to each other along the respective interior bores to form a BOP "stack."
  • a BOP "stack" (i.e., two or more of the foregoing types of well pressure control devices arranged longitudinally one atop the other) may be coupled, at one longitudinal end opposed to the longitudinal end connected to the wellhead, to a conduit (e.g., a "riser") that extends to a drilling platform proximate the water surface. Coupling to the riser may be through a set of devices called a "lower marine riser package” (LMRP). In certain situations, for example, adverse weather conditions, that make it desirable to move the riser and the drilling platform away from the well location, it then becomes necessary to disconnect the riser from the BOP stack.
  • LMRP lower marine riser package
  • Disconnection may be performed, for example, by uncoupling the LMRP from the BOP stack after closing one or more pressure control elements in the BOP stack.
  • Uncoupling may include, for example and without limitation, unthreading threaded connectors, removing coupling bolts from mating flanges and/or releasing a profile connector by rotating components of the LMRP.
  • Disconnecting the LMRP from the BOP stack in a station keeping emergency is a very important function for a BOP stack. It is known in the art to take one minute or longer to complete an emergency disconnect. Using known methods for LMRP disconnection such as by uncoupling the example devices described above may require that disconnection decisions are made early, e.g., dynamic positioning watch circles need to consider the disconnect time.
  • permissible LMRP connector release angles can be smaller than flex joint angle ratings. That is, the LMRP release angle can be governing as to the amount of movement of the drilling platform during disconnect operations.
  • a coupling system includes a lower marine riser package having a connector at a bottom end and at least one blowout preventer pressure control element coupled to a wellhead and having a connector at an upper end. Explosively frangible fasteners are used to couple the connector on the lower marine riser package to the connector on the at least one blowout preventer pressure control element.
  • a method for separating a lower marine riser package from a blowout preventer coupled to a subsea wellhead includes closing a least one pressure control element in the blowout preventer. At least one explosively frangible fastener coupling the blowout preventer to the lower marine riser package is detonated. The lower marine riser package is then lifted from the blowout preventer.
  • the connector on the lower marine riser package is coupled to the connector on the at least one blowout preventer pressure control element by the explosively frangible fasteners being disposed through a corresponding bolt flange on each of the connector on the lower marine riser package and the connector on the at least one blowout preventer pressure control element.
  • the explosively frangible fasteners comprise explosively frangible nuts.
  • the connector on the at least one blowout preventer pressure control element comprises a profile connection at one longitudinal end.
  • the connector on the lower marine riser package comprises a profile connection to couple the connector on the lower marine riser package to the lower marine riser package.
  • a plurality of blowout preventer pressure control elements are coupled to the wellhead.
  • the lower marine riser package comprises at least one blowout preventer pressure control element.
  • a method for separating a lower marine riser package from a blowout preventer coupled to a subsea wellhead includes closing at least one pressure control element in the blowout preventer. At least one explosively frangible fastener coupling the blowout preventer to the lower marine riser package is detonated. The lower marine riser package is then lifted from the blowout preventer. [0014] In some embodiments, prior to detonating the at least one explosively frangible fastener, at least one auxiliary line extending between the lower marine riser package and the blowout preventer is uncoupled.
  • a connector on the lower marine riser package is coupled to a corresponding connector on the blowout preventer by a plurality of explosively frangible fasteners being disposed through a corresponding bolt flange on each of the connector on the lower marine riser package and the connector on the blowout preventer.
  • the explosively frangible fasteners comprise explosively frangible nuts.
  • the connector on the blowout preventer comprises a profile connection at one longitudinal end.
  • the connector on the lower marine riser package comprises a profile connection to couple the connector on the lower marine riser package to the lower marine riser package.
  • FIG. 1 shows an example embodiment of a LMRP connected to a subsea BOP stack, wherein the subsea BOP stack is connected to a subsea wellhead.
  • FIG. 2 shows the example embodiment of FIG. 1 wherein the LMRP has been disconnected from the subsea BOP stack.
  • the LMRP is shown canted at a relatively large angle with reference to the subsea BOP stack.
  • FIG. 3 shows a cross-section of an example embodiment of an explosive quick disconnect mandrel system according to the present disclosure.
  • FIG. 4 shows a perspective side view of the example embodiment shown in FIG.
  • FIG. 5 shows a cross-section of the example explosive quick disconnect system of
  • FIG. 3 after explosive removal of fasteners (e.g., studs and threaded nuts) that join an upper mandrel to a lower mandrel.
  • FIG. 6 shows a perspective side view of the illustration of FIG. 5.
  • FIG. 1 shows an example embodiment of a lower marine riser package (LMRP)
  • a subsea BOP "stack" 14 i.e., a plurality of vertically assembled wellbore pressure control elements assembled to each other to produce a series connected set of well shut in valves
  • the subsea BOP stack 14 is connected to a subsea wellhead (not shown) using a connector 16.
  • a connector such as a double mandrel 10 may be used to connect the LMRP 12 to the BOP stack 14.
  • the LMRP 12 may itself comprise one or more pressure control elements, or in some embodiments the LMRP 12 may not have any such pressure control elements.
  • the double mandrel 10 may comprise a lower mandrel 10A coupled to an upper end of the BOP stack 14 and an upper mandrel 10B coupled to a lower and of the LMRP 14.
  • the lower mandrel 10A may be connected to the BOP stack 14, e.g., by a profile coupling, bolted flange, or any other connection known in the art.
  • the upper mandrel 10B may be connected to the LMRP 12, for example, in any similar manner as the connection between the lower mandrel 10A and the BOP stack 14.
  • a riser (not shown) may extend from the top of the LMRP 12 to a drilling platform (not shown) on the water surface.
  • the BOP stack 14 shown in the various drawing figures and described herein may include a plurality of wellbore pressure control elements, for purposes of the present disclosure only one such pressure control element is needed.
  • FIG. 2 shows the LMRP 12 disconnected from the BOP stack 14 by uncoupling the lower mandrel 10A from the upper mandrel 10B.
  • the lower mandrel 10A and upper mandrel 10B may be configured such that much greater angle between the longitudinal axis of the LMRP 12 and the BOP stack 14 may be obtained than by disconnect devices and methods known in the art.
  • such uncoupling may comprise detonating explosive frangible fasteners, for example explosively frangible nuts IOC and/or explosively frangible studs 10D which may couple a flange 10B 1 on the upper mandrel 10B to a corresponding flange 10A1 on the lower mandrel 10A.
  • explosively frangible nuts and/or explosively frangible studs may be obtained, for example, from Pacific Scientific Energetic Materials Company, 7073 West Willis Road, Chandler, Arizona 85226.
  • Example products sold by the foregoing organization comprise frangible nuts which are broken apart by detonation of an explosive charge and explosive bolts which are similarly broken apart.
  • frangible nuts IOC may be used on one or both ends of studs 10D that pass through openings in the upper mandrel flange 10B 1 and lower mandrel flange 10A1.
  • FIG. 4 shows a perspective side view of the coupled upper mandrel 10B and lower mandrel 10A, wherein explosive nuts IOC are used on one end of the studs 10D.
  • FIGS. 5 and 6 show, respectively, a cross section view and a perspective side view of the upper mandrel 10B being separated from the lower mandrel 10A after detonation of the explosively frangible fasteners (e.g., nuts IOC in FIGS. 3 and 4).
  • the upper mandrel 10B may be separated from the lower mandrel 10A simply by lifting the LMRP (12 in FIG. 2) from the BOP stack (14 in FIG. 2).
  • Profile connections 10B2 and 10A2 may be provided on one longitudinal end of each of the upper mandrel 10B and lower mandrel 10A respectively whereby the upper mandrel 10B may be coupled to the LMRP (12 in FIG. 2) using the profile connection 10B2.
  • the profile connection 10A2 on the lower mandrel 10A may provide a mechanism to enable attaching devices to the lower mandrel 10A, e.g., to reconnect either the LMRP (12 in FIG. 2) or a capping stack to the BOP stack (14 in FIG. 2).
  • a system according to the present disclosure may comprise a BOP stack which is connected to the wellhead by a connector.
  • a first mandrel with explosively frangible fasteners is located on top of the BOP stack.
  • a lower marine riser package (LMRP) is connected to the mandrel by means of a connector.
  • the connector may be a second mandrel having a bolt flange corresponding to a bolt flange on the first mandrel.
  • the second mandrel may have a profile connector at one end for coupling to the LMRP.
  • the first mandrel may comprise a profile connector similar in configuration to the profile connector on the second mandrel, whereby after separation of the two mandrels, a connection may be provided on the first mandrel to reconnect the LMRP or to connect a capping stack or other device to the BOP stack.
  • Auxiliary connections between the LMRP and the BOP stack may comprise choke and kill lines, boost lines, hydraulic and/or electric power lines and sensors.
  • a double mandrel arrangement with explosive nuts may be used between the BOP stack and the LMRP. This would allow the first mandrel to be released from the lower stack but would still maintain an intact mandrel connection to reconnect either the LMRP or capping stack to the lower stack.
  • the explosively frangible fasteners could be attached to any other flanged connection on the BOP stack or LMRP.
  • explosively frangible studs, bolts, or another type of explosively frangible fastener could be used instead of explosively frangible nuts.
  • a method for separating a LMRP from a BOP stack may comprise closing a pressure control element, e.g., a shearing element (either a static force operated shear ram or a kinetic energy operated shear ram ) in a BOP stack coupled at its upper end to a lower marine riser package (LMRP). All auxiliary connections between the BOP stack and LMRP (if any are present) are disconnected. Explosively frangible fasteners that couple the LMRP to the BOP stack are detonated to separate the LMRP from the BOP stack.
  • a pressure control element e.g., a shearing element (either a static force operated shear ram or a kinetic energy operated shear ram ) in a BOP stack coupled at its upper end to a lower marine riser package (LMRP). All auxiliary connections between the BOP stack and LMRP (if any are present) are disconnected. Explosively frangible fasteners that couple the LMRP to the BOP stack are
  • reconnection of the LMRP to the BOP stack or coupling of another device such as a capping stack may be performed by latching dogs onto a connecting profile at one end of the mandrel or connector on an upper longitudinal end of a mandrel on the BOP stack.

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)

Abstract

Selon l'invention, un système d'accouplement comprend un ensemble inférieur de colonne montante marine comportant un raccord au niveau d'une extrémité inférieure et au moins un élément de régulation de pression de bloc obturateur accouplé à une tête de puits et comportant un raccord au niveau d'une extrémité supérieure. Des éléments de fixation à rupture par explosion sont utilisés pour accoupler le raccord sur l'ensemble inférieur de colonne montante marine au raccord sur l'au moins un élément de régulation de pression de bloc obturateur. Un procédé de séparation d'un ensemble inférieur de colonne montante marine d'un bloc obturateur accouplé à une tête de puits sous-marine consiste à fermer au moins un élément de régulation de pression dans le bloc obturateur. Au moins un élément de fixation à rupture par explosion accouplant le bloc obturateur à l'ensemble inférieur de colonne montante marine est détonné. L'ensemble inférieur de colonne montante marine est alors soulevé du bloc obturateur.
EP17877949.2A 2016-12-08 2017-10-23 Déconnexion explosive Withdrawn EP3551837A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662431455P 2016-12-08 2016-12-08
PCT/US2017/057826 WO2018106347A1 (fr) 2016-12-08 2017-10-23 Déconnexion explosive

Publications (2)

Publication Number Publication Date
EP3551837A1 true EP3551837A1 (fr) 2019-10-16
EP3551837A4 EP3551837A4 (fr) 2020-07-29

Family

ID=62491446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17877949.2A Withdrawn EP3551837A4 (fr) 2016-12-08 2017-10-23 Déconnexion explosive

Country Status (7)

Country Link
US (1) US20190338614A1 (fr)
EP (1) EP3551837A4 (fr)
CN (1) CN110036178A (fr)
AU (1) AU2017370435B2 (fr)
BR (1) BR112019010243B1 (fr)
CA (1) CA3045336C (fr)
WO (1) WO2018106347A1 (fr)

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EP3959414A1 (fr) 2019-04-26 2022-03-02 McCormick, Craig Maintien de station et capacité de déconnexion d'urgence améliorés pour un navire connecté à une tête de puits sous-marine en eaux peu profondes
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Also Published As

Publication number Publication date
BR112019010243B1 (pt) 2023-02-14
EP3551837A4 (fr) 2020-07-29
CN110036178A (zh) 2019-07-19
AU2017370435A1 (en) 2019-06-20
CA3045336A1 (fr) 2018-06-14
US20190338614A1 (en) 2019-11-07
WO2018106347A1 (fr) 2018-06-14
AU2017370435B2 (en) 2020-10-22
CA3045336C (fr) 2021-03-09
BR112019010243A2 (pt) 2019-09-03

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