WO2006025744A1 - Dispositif de raccord de surete pour pipeline - Google Patents

Dispositif de raccord de surete pour pipeline Download PDF

Info

Publication number
WO2006025744A1
WO2006025744A1 PCT/NO2005/000309 NO2005000309W WO2006025744A1 WO 2006025744 A1 WO2006025744 A1 WO 2006025744A1 NO 2005000309 W NO2005000309 W NO 2005000309W WO 2006025744 A1 WO2006025744 A1 WO 2006025744A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
joint
disclosed
pipe
vessel
Prior art date
Application number
PCT/NO2005/000309
Other languages
English (en)
Inventor
Petter Eriksen
Original Assignee
Fmc Kongsberg Subsea 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 Fmc Kongsberg Subsea As filed Critical Fmc Kongsberg Subsea As
Publication of WO2006025744A1 publication Critical patent/WO2006025744A1/fr

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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform
    • E21B19/006—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform including heave compensators
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/06—Releasing-joints, e.g. safety joints

Definitions

  • the invention relates to a safety joint device for a pipe, and in particular for a riser extending between a vessel and a subsea installation, which joint comprises two telescoping parts that are interconnected by means which are designed to break at a preset axial load.
  • a column of this kind is usually termed a riser or riser system and comprises not only the pipe itself but also a number of other devices which in addition to the actual pipe are necessary for safe access to the well. All operations in the well are carried out through the riser as it forms a barrier between well fluids and the surrounding seawater. The operations are carried out in a "live" well, i.e., the well is open all the way up to the vessel and contains well fluids which have a pressure corresponding to the formation pressure. The riser must therefore be dimensioned to withstand high well pressures. On the other hand, an uncontrolled blow-out can cause the riser to be filled with gas from the well, which will result in the pressure within the riser falling to almost zero.
  • the riser system normally comprises a lower riser package (LRP) having a plurality of valves for shutting down the well, and which therefore in terms of function corresponds to a blowout preventer (BOP).
  • BOP blowout preventer
  • An emergency quick disconnect package (EQDP) and a stress joint are also provided.
  • EQDP emergency quick disconnect package
  • a surface BOP is usually provided.
  • the riser may be equipped with flexible joints, buoyancy elements and optional other devices for operations in a seabed well.
  • a vessel When operations are to be carried out in wells located at substantial ocean depths, a vessel is used that is held in the correct position by means of propellers and/or thrusters. Such vessels are called dynamically positioned (DP) vessels. These vessels are highly dependent on all systems functioning satisfactorily and usual practice requires them to be equipped with several systems as safeguards against the vessel drifting out of its position.
  • DP dynamically positioned
  • the vessel's heave compensation system which ensures that the riser system remains vertically still relative to the seabed, whilst the vessel heaves because of waves and weather, may also in some cases lock and then exert high tensile forces on the riser and cause a danger of the loss of the well barrier(s).
  • Breaks in the riser can cause damage to the vessel and be a danger to personnel in addition to causing environmental damage, i.e., discharge of hydrocarbons, hydraulic fluid or the like. This may happen because of the energy in the extended riser and the contents of the riser.
  • a complicating factor will be present if the riser has an internal pressure of an instabilised fluid or a mixture of gas and fluid.
  • the fluid which then flows out of the lower end of the riser will cause an upwardly directed force which seeks to press the riser up into the rig against the heave compensation, thereby rendering the situation more unstable.
  • the riser can be pressed upwards with such force that the equipment in the vessel is damaged and even sustains a shipwreck. A situation of this kind could also result in the loss of human life.
  • the invention seeks to remedy this problem by equipping the riser with a device that causes the pipe to break at a predetermined point when it is subjected to a bending moment of a preset value.
  • the joint comprises means for translation of bending moment into axial load.
  • Fig. 1 shows a section through a joint according to the invention; and Figs. 2-5 show the joint at different stages of bending.
  • Fig. 1 shows a joint 10.
  • This joint is made as a separate part with coupling ends 12, 14 for connection to a pipe. It can be positioned wherever it is expedient, but it is advantageously positioned immediately above the joint for emergency disconnection.
  • the joint can be a part of the emergency disconnect unit.
  • the joint is used in a dual bore riser and thus has a through-going main duct 16 and a side duct 18, 18' which are connected to each other by a flexible hose 19.
  • the joint comprises a lower housing 20 comprising a portion having an enlarged diameter of the inner passage 16, for receiving a pipe end piece 22. Screwed onto the housing 20 at its upper end is a cup-shaped flange 24 which is outwardly flared in the upward direction and has an annular end face 26. Sealing elements 23 and 25 are disposed between the housing 20 and the pipe end piece 22.
  • a floating piston 30 is arranged in a recess 28. The volume above the piston 30 communicates via a duct 31 with the passage 16, and the volume below the piston communicates via a duct (not shown) with the surroundings.
  • the piston functions as a tension equaliser which renders the separation force between the pipe end piece 22 and the housing 20 independent of varying pressure within the passage 16.
  • the pipe end piece 22 is secured in the housing 20 by means of two sets of shear pins 32, 34. These may be pins evenly distributed around the circumference or may be formed as a ring. The shear pins are designed to break when they are subjected to a predetermined force.
  • the pipe end piece 22 has an upper outwardly flared portion 36 with lower 37 and upper 38 faces. These faces are advantageously spherical faces.
  • the joint further comprises an upper housing 40 which has a lower part 42 that is a portion of enlarged outer diameter.
  • a cavity 44 is provided in the projection 42 for receiving the outwardly flared portion 36 of the pipe end piece 22.
  • the cavity is defined by an inner cylindrical part 46 with an end face 47 that is designed to rest against the end face 38, and an outer cylindrical part 48 in which a plurality of bores 49, 50 (only two are shown) are provided for receiving bolts 51, 52.
  • a flange 54 is screwed to the end of the part 42 by means of the bolts 51, 52.
  • the outer diameter of the flange 54 is approximately equal to the outer diameter of the cup-shaped flange 24.
  • the inside of the flange is made having a upward facing spherical face 56.
  • a rubber sleeve 60 is arranged so that it lies between the faces 56 and 37.
  • the rubber sleeve functions as a bending limiter in order to reduce the loads on the riser during normal use and.also is a pressure barrier between passage 16 and the surroundings, which is well known.
  • the outer side of the flange is made having a downward facing circular face 55.
  • One or more locking means 70 may be provided to stiffen the joint that is made up of 40, 22 and 60 and to hold the joint together in those cases that neither bendability nor having the safety joint activated is desirable. This may be during the installation and pulling of the riser system, and during the handling of the safety joint and its opposite components.
  • shear pins 32 When the riser is subjected to a tension in excess of a predetermined value, the shear pins 32 will shear so that the upper part begins to separate from the lower part. This separation will continue until the piston 30 meets the upper wall of recess 28, whereupon shear pins 34 shear with subsequent complete separation.
  • the upper shear pins 32 are dimensioned not to shear until the tension in the riser has exceeded an allowed value, but before damage is done to the well control elements or other parts of the riser system.
  • Shear pins 34 are dimensioned to withstand tensile forces as a result of the separation force the pressure in passage 16 exerts, which will be much lower than the capacity of the shear pins 32. Thus, it can be ensured that the riser breaks at a predetermined point.
  • the pipe end piece 22 will then take the piston 30 and shear pins 34 with it until the piston 30 meets its end stop and shear pins 34 shear (Fig. 4).
  • the upper part 40 of the joint will thus separate from the lower part 20 and can be pulled up, as shown in Fig. 5.
  • the riser is designed, under normal operations, to be able to deflect (bend) within certain limits. This deflection is taken up by the flexible joint that is provided by the rubber sleeve 60.
  • the riser must be regarded as a rigid column and because of the vessel's motions in waves and the wind, the riser will always be subjected to a certain deflection which may result in a danger of fatigue fractures in the pipe, and which renders a flexible joint necessary.
  • the vessel's dynamic positioning system will normally ensure that the vessel is held in a position within the allowed limits that can be taken up by the flexible joint. However, the positioning system may fail and the vessel may move out of its safe position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Catching Or Destruction (AREA)
  • Earth Drilling (AREA)

Abstract

Cette invention concerne un joint de sécurité pour tube goulotte constitué de deux parties téléscopiques maintenues ensemble au moyen de goupilles de sécurité conçues pour se rompre lorsqu'elles sont soumises à une tension orientée vers le haut. Le joint est également doté de moyens qui provoquent la rupture des goupilles de sécurité si l'angle entre les parties téléscopiques supérieures et inférieures dépasse une valeur prédéterminée.
PCT/NO2005/000309 2004-09-02 2005-08-26 Dispositif de raccord de surete pour pipeline WO2006025744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20043675 2004-09-02
NO20043675A NO321184B1 (no) 2004-09-02 2004-09-02 Anordning for sikkerhetsskjot for et ror

Publications (1)

Publication Number Publication Date
WO2006025744A1 true WO2006025744A1 (fr) 2006-03-09

Family

ID=35057572

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2005/000309 WO2006025744A1 (fr) 2004-09-02 2005-08-26 Dispositif de raccord de surete pour pipeline

Country Status (2)

Country Link
NO (1) NO321184B1 (fr)
WO (1) WO2006025744A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK201070213A (en) * 2010-05-25 2011-11-26 Maersk Supply Service As Shear connection
GB2486053A (en) * 2010-11-30 2012-06-06 Vetco Gray Scandinavia As Riser emergency disconnect joint
RU2588893C2 (ru) * 2011-03-11 2016-07-10 Акер Сабси АС Предварительно напряженный соединительный элемент
NO20201051A1 (en) * 2020-09-24 2022-03-25 Subseadesign As A weak link

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO329804B1 (no) 2009-02-09 2010-12-20 Fmc Kongsberg Subsea As Kobling for bruk i et stigeror, stigeror med en slik kobling og fremgangsmate for a oke operasjonsvinduet til et stigeror

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059288A (en) * 1976-09-01 1977-11-22 Hydrotech International, Inc. Pressure balanced safety pipeline connector
US4469354A (en) * 1982-09-30 1984-09-04 The Boeing Company Breakaway duct coupling
US5382056A (en) * 1993-07-12 1995-01-17 Abb Vetco Gray Inc. Riser weak link
US5791695A (en) * 1995-04-18 1998-08-11 Continental Emsco Co. Flexible joint for facilitating bending of tubular segments
US5951061A (en) * 1997-08-13 1999-09-14 Continental Emsco Company Elastomeric subsea flex joint and swivel for offshore risers
WO2003064809A1 (fr) * 2002-02-01 2003-08-07 Smedvig Offshore As Mecanisme de declenchement permettant de deconnecter une colonne montante d'un raccord de colonne montante

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059288A (en) * 1976-09-01 1977-11-22 Hydrotech International, Inc. Pressure balanced safety pipeline connector
US4469354A (en) * 1982-09-30 1984-09-04 The Boeing Company Breakaway duct coupling
US5382056A (en) * 1993-07-12 1995-01-17 Abb Vetco Gray Inc. Riser weak link
US5791695A (en) * 1995-04-18 1998-08-11 Continental Emsco Co. Flexible joint for facilitating bending of tubular segments
US5951061A (en) * 1997-08-13 1999-09-14 Continental Emsco Company Elastomeric subsea flex joint and swivel for offshore risers
WO2003064809A1 (fr) * 2002-02-01 2003-08-07 Smedvig Offshore As Mecanisme de declenchement permettant de deconnecter une colonne montante d'un raccord de colonne montante

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK201070213A (en) * 2010-05-25 2011-11-26 Maersk Supply Service As Shear connection
WO2011147882A1 (fr) * 2010-05-25 2011-12-01 Maersk Supply Service A/S Entretoise de cisaillement
GB2486053A (en) * 2010-11-30 2012-06-06 Vetco Gray Scandinavia As Riser emergency disconnect joint
US9091127B2 (en) 2010-11-30 2015-07-28 Vetco Gray Scandinavia As Safety joint and riser
GB2486053B (en) * 2010-11-30 2015-12-02 Vetco Gray Scandinavia As Safety joint and riser comprising such a safety joint
RU2588893C2 (ru) * 2011-03-11 2016-07-10 Акер Сабси АС Предварительно напряженный соединительный элемент
NO20201051A1 (en) * 2020-09-24 2022-03-25 Subseadesign As A weak link
NO346846B1 (en) * 2020-09-24 2023-01-30 Subseadesign As A weak link

Also Published As

Publication number Publication date
NO321184B1 (no) 2006-04-03
NO20043675D0 (no) 2004-09-02

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