WO2023021191A1 - Colonne montante marine avec dispositif de support pour module de flottabilité de colonne montante - Google Patents

Colonne montante marine avec dispositif de support pour module de flottabilité de colonne montante Download PDF

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Publication number
WO2023021191A1
WO2023021191A1 PCT/EP2022/073212 EP2022073212W WO2023021191A1 WO 2023021191 A1 WO2023021191 A1 WO 2023021191A1 EP 2022073212 W EP2022073212 W EP 2022073212W WO 2023021191 A1 WO2023021191 A1 WO 2023021191A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
marine riser
connector part
load ring
support
Prior art date
Application number
PCT/EP2022/073212
Other languages
English (en)
Inventor
David SKAARSJOE
Rafael Borges
Per Atle GUSTAFSON
Original Assignee
Mhwirth Do Brasil Equipamentos Ltda.
Mhwirth 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 Mhwirth Do Brasil Equipamentos Ltda., Mhwirth As filed Critical Mhwirth Do Brasil Equipamentos Ltda.
Publication of WO2023021191A1 publication Critical patent/WO2023021191A1/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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • E21B17/012—Risers with buoyancy elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats, weights
    • F16L1/24—Floats; Weights

Definitions

  • the present invention relates to a marine riser having a support device suitable for supporting and/or securing a buoyancy module to the riser, such as a marine riser used in offshore drilling operations.
  • a drill pipe extends down from a drilling rig into the well bore, and is enclosed by a tubular riser (known as a marine riser or a drilling riser) which is suspended from the drilling rig and connected to a well head mounted at the top of the well bore on the sea bed.
  • the riser is typically made from a plurality of riser segments connected end-to-end by means of a connection joint. Each end of a riser segment is typically provided with a radially outwardly extending connection flange including an array of bolt holes or interfaces for a connection member such as a lock ring, threaded fastener or locking dogs, and adjacent segments are connected together to form the riser.
  • Piping for auxiliary lines such as choke and kill lines, boost lines, and hydraulic supply and control lines extend along the riser, mounted on the outside of the riser.
  • buoyancy modules which reduce the weight of the submerged riser that the drilling rig has to support. These are fitted at intervals along the length of the riser, and typically comprise a low density filler material, such as a foam, encapsulated by a rigid outer shell.
  • the buoyancy aid may alternatively be hollow or additionally include a hollow portion which can be selectively filled with a liquid or gas in order to control the buoyancy of the module.
  • a support device may be provided to prevent or substantially prevent axial movement of the buoyancy module relative to the riser. This may be in the form of a collar provided with an integral radially outwardly extending flange which is located above and/or below the buoyancy module. Such collars are often referred to as a thrust and stop collars.
  • Documents which may be useful for understanding the field of technology include US 2010/0270025 Al, WO 2019/139483 Al, WO 2010/053447, US 2012/247782 and US 4,477,207.
  • the present disclosure relates to an improved support device suitable for supporting and/or securing a buoyancy module to a riser.
  • a marine riser having at least one buoyancy module and a support device, the support device having: a support flange, the support flange engaging the at least one buoyancy module to restrict movement of the buoyancy module relative to the riser, and a load ring engaging a connector part of the riser.
  • Fig. 1 shows a thrust collar according to the prior art.
  • Fig. 2 shows a riser section having buoyancy modules.
  • Fig. 3 shows components of the riser section illustrated in Fig. 2.
  • Figs 4-6 illustrate parts of a marine riser having a support device for riser buoyancy modules.
  • Figs 7-8 illustrate an embodiment of a support device.
  • FIG. 1 An example of a prior art thrust collar and liner is illustrated in Fig. 1, which shows the thrust collar 10, flange 12, and liner 14, and bolts 24 by means of which the parts of the collar are fastened together. (See also the above-mentioned WO 2019/139483 Al.)
  • a plurality of buoyancy modules 23 can be fixed to, and make up a part of, a riser 1.
  • Sections of the riser 1 have connector parts 18 comprising flanges and including a plurality of bolt holes at either end 16.
  • connection between riser sections may be provided with a different type of connector, such as a lock ring engaging the connector parts 18.
  • the bolts 20 by means of which the riser section may be secured to an adjacent riser section can be seen in the bolt holes of the connector part 18 at the lowermost end.
  • the riser 1 comprises a main, central pipe 15 and external piping 22, such as choke and kill lines, may extends longitudinally along the entire length of the riser 1.
  • each buoyancy module 23 may be split longitudinally into two substantially identical segments which together form a substantially cylindrical tube around the main pipe 15.
  • the buoyancy modules 23 may, however, alternatively be split longitudinally into more than two segments.
  • each buoyancy module may be split into three segments, one which covers a 180° segment of the circumference of the riser 16, and two which each cover a 90° segment of the circumference of the riser 16.
  • thrust and stop collars for example a collar 10 as illustrated in Fig. 1, are conventionally fixed on the main pipe 15.
  • the collars are placed around the main pipe 15, inserted between the external piping 22 and the main pipe 15 so the external piping 22 is located radially outwardly of the collars.
  • the collars may be fixed in tight engagement with the main pipe 15 such that friction forces prevent movement of the collar relative to the main pipe 15.
  • Flanges (see item 12 in Fig. 1) are brought into engagement with corresponding surfaces on the buoyancy modules 23, whereby the buoyancy modules are longitudinally fixed and longitudinal forces acting on the buoyancy modules 23 are transferred to the main pipe 15 via the collar 10.
  • a challenge with such friction-based collars is that the friction effects may be difficult to estimate at the design stage, and may vary during operation.
  • the main pipe 15 may be subjected to temperature variations during use or the pre-tensioning of the bolts 24 may not be accurately controlled during mounting or may change during use due to external influence. These, or other factors, may lead to the lateral force capacity of the collar varying, with a risk that the collar becomes unable to withstand the lateral forces applied to it by the buoyancy module 23, resulting in unwanted movement of the buoyancy module 23 relative to the main pipe 15 (so-called slip failure), which can cause a safety risk.
  • the riser 1 may have a support device 30 for supporting at least one buoyancy module 23, where the support device 30 has a support flange 12 for engaging the buoyancy module 23 to restrict movement of the buoyancy module in a direction parallel to the longitudinal axis of the riser 1, and a load ring 31 engaging a connector part 18 of the riser 1.
  • Figures 5 and 6 illustrate the support device 30 installed on the riser 1, while Fig. 4 illustrates the support device 30 alone.
  • the support flange 12 comprises a support face which engages a corresponding face on the buoyancy module 23, so as to support and prevent movement of the buoyancy module 23.
  • the support flange 12 may, for example, be constructed from metal plates or the like.
  • the support flange 12 and corresponding support face on the buoyancy module 23 may preferably be oriented substantially radially (i.e., perpendicularly to the longitudinal axis of the riser 1).
  • the support flange 12 may include recesses 36, such as a semi-circular recesses, at a radially outward edge of the support flange 12.
  • the recesses 36 can provide space for the external piping 22, such that the support device 30 does not interfere with the piping 22.
  • the load ring 31 can preferably be fixed to the connector part 18 by tight engagement with an outward-facing surface of the connector part 18, for example by adjustable bolts 38 (similarly as bolts 24 described above). Such a connection can be arranged to provide a friction force to resist and/or prevent movement of the load ring 31 relative to the connector part 18.
  • the load ring 31 may simply rest against a surface on the connector part 18, being held in place by the surface of the connector part 18 on one side and the buoyancy module 23 on the other side.
  • connection members 35 rigidly connect the support flange 12 with the load ring 31.
  • the connection members 35 are preferably length-adjustable, for example via an adjustment screw or nut, in order to allow a tight and secure fit of the support device 30.
  • the connection members 35 are preferably disposed about the main pipe 15. There may, for example, be four, five, six or more connection members 35 arranged about the main pipe 15 for enhanced load distribution.
  • the connection members 35 preferably extend parallel to a longitudinal axis of the riser 1, however may optionally be arranged with an angle to the longitudinal axis.
  • connection members 35 are arranged independent of any external pipes 22 of the riser 1, for example by arranging the connection members 35 in an annular space radially inwardly from the external pipes 22, between the main pipe 15 and the external pipes 22.
  • the load ring 31 may be disposed annularly between the connector part 18 and the external pipes 22, and preferably independent of the external pipes 22.
  • the load ring 31 may advantageously comprise a tapered radially inwardly facing interface surface 33 towards the connector part 18.
  • the surface 33 may, for example, be frustoconical or other non-cylindrical shape such as having curved or elliptical two dimensional cross sections with a varying diameter.
  • the interface surface 33 may engage a corresponding outer, tapered (e.g. frustoconical) surface 34 of the connector part 18.
  • tapered e.g. frustoconical
  • the interface surface 34 on the connector part 18 may be cylindrical and parallel to the longitudinal axis of the riser 1, and where the load ring 31 is fixed to the connector part 18 by friction.
  • the connector part 18 can be fixed to a main, central pipe 15 of the riser 1 via a weld 32.
  • the support device 30 advantageously spans the weld 32.
  • a liner 37 such as an elastomer, polymer or glass-reinforced polymer liner, can optionally be arranged between the connector part 18 and the radially inwardly facing surface 33 of the load ring 31.
  • the liner 37 can be made from a material which has at least one of the following properties: acts to increase the coefficient of friction between the load ring 31 and the connector part 18 or protects the adjacent surfaces of the connector part 18 and/or load ring 31 (for example coated surfaces) from damage.
  • the load ring 31 To enable mounting or removal of the load ring 31, it can be made splittable into at least two parts, for example semi-circular parts.
  • the at least two parts can for example be bolted together by bolts 38.
  • the support flange 12 may, similarly, be splittable into at least two parts, for example semicircular parts, for easier mounting or removal of the support device 30.
  • the support device 30 is designed to be sufficiently modular to allow assembly of the support device 30 on the riser 1 without removing the external piping 22 or the buoyancy modules 23.
  • the load ring 31 is longitudinally spaced from the bolts 20 on the connector part 18 when the riser 1 is in the installed, operating configuration. (Or similarly spaced from for example a lock ring, if the riser 1 is not a bolted riser.) This can, as illustrated in the figures, be done by arranging the load ring 31 on a section 18' (see Fig. 5) of the connector part 18 which is proximate the weld 32 and the main pipe 15, and thus spaced from the outer end section 18" (Fig. 6) of the connector part 18 at which the bolts 20 are located (typically, a radial flange having bolt holes as shown or a lock ring connection profile for end-to-end connection of riser segments).
  • the support flange 12 may further comprise a collar 10' disposed annularly about and fixed to the main pipe 15.
  • the collar 10' may otherwise be similar to the collar 10 described above in relation to Fig. 1.
  • the support flange 12 may be fixed to the main pipe 15 via the collar 10' and so have a friction connection to the main pipe 15.
  • the embodiment illustrated in Fig. 7 may, for example, also permit retrofitting of existing solutions comprising such a collar 10/10' by adding the load ring 31 having an interface towards the connector part 18 as described above and connection members 35 towards the collar 10/10' to produce a support device 30.
  • multiple support devices 30 can be provided on one section of the riser 1, particularly there may be one support device 30 above and one below a buoyancy module 23, or one support device 30 above and one below a row of buoyancy devices 23, to provide support in both directions.
  • a new way of arresting the forces imposed by the buoyancy on a marine riser to the main load path of the riser is provided.
  • Embodiments provides less reliance on friction between a clamp and the main pipe, thereby reducing the risk of functional failure, while not limiting accessability for example for heavy duty tooling (such as bolt make-up tools) used to make up the connection between riser joints.
  • the connector part 18 (unlike the main pipe 15) is usually a machined component, the interface surface for the load ring 31 can be manufactured with better manufacturing tolerances than a pipe, and the connector part 18 is less affected by expansion or contraction during operation of the riser 1.
  • the connector part 18 may thus be a monolithic, machined metallic structure which is fixed to the main pipe 15 by a weld 32, and which makes up an end connector for the riser 1.
  • the load ring 31 can be made very rigid as it does not need to be flexible to form around the non-perfect shape of a pipe. This provides better load distribution and improves a friction and/or mechanical fixation of the load ring 31 in relation to the connector part 18 with less risk of slip failure.

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  • 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)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)

Abstract

Colonne montante marine (1) comprenant au moins un module de flottabilité (23) et un dispositif de support (30), le dispositif de support (30) ayant : une bride de support (12), la bride de support (12) venant en prise avec le ou les modules de flottabilité (23) pour limiter le mouvement du module de flottabilité par rapport à la colonne montante (1), et une bague de charge (31) venant en prise avec une partie de connecteur (18) de la colonne montante (1).
PCT/EP2022/073212 2021-08-20 2022-08-19 Colonne montante marine avec dispositif de support pour module de flottabilité de colonne montante WO2023021191A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2111964.9 2021-08-20
GB2111964.9A GB2609980A (en) 2021-08-20 2021-08-20 Marine riser with support device for riser buoyancy module

Publications (1)

Publication Number Publication Date
WO2023021191A1 true WO2023021191A1 (fr) 2023-02-23

Family

ID=77913930

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/073212 WO2023021191A1 (fr) 2021-08-20 2022-08-19 Colonne montante marine avec dispositif de support pour module de flottabilité de colonne montante

Country Status (2)

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GB (1) GB2609980A (fr)
WO (1) WO2023021191A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477207A (en) 1982-08-26 1984-10-16 Johnson Arne I Marine riser buoyancy assembly
WO2010053447A1 (fr) 2008-11-06 2010-05-14 Dynaglass Reinforced Plastic Pte Ltd Modules de flottaison de colonne montante de forage
US20100270025A1 (en) 2009-04-28 2010-10-28 Vetco Gray Inc. Riser Buoyancy Adjustable Thrust Column
US20120247782A1 (en) 2011-03-31 2012-10-04 Deep Down, Inc. Marine riser adjustable buoyancy modules
US8827338B2 (en) * 2012-08-30 2014-09-09 Nudawn Metal Fabrication, Inc. Clamp and hoisting device
US20180044996A1 (en) * 2016-08-10 2018-02-15 Cameron International Corporation Buoyancy System for Marine Riser
WO2019139483A1 (fr) 2018-01-09 2019-07-18 Mhwirth Do Brasil Equipamentos Ltda. Dispositif de fixation pour module de flottabilité de colonne montante marine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477207A (en) 1982-08-26 1984-10-16 Johnson Arne I Marine riser buoyancy assembly
WO2010053447A1 (fr) 2008-11-06 2010-05-14 Dynaglass Reinforced Plastic Pte Ltd Modules de flottaison de colonne montante de forage
US20100270025A1 (en) 2009-04-28 2010-10-28 Vetco Gray Inc. Riser Buoyancy Adjustable Thrust Column
US20120247782A1 (en) 2011-03-31 2012-10-04 Deep Down, Inc. Marine riser adjustable buoyancy modules
US8827338B2 (en) * 2012-08-30 2014-09-09 Nudawn Metal Fabrication, Inc. Clamp and hoisting device
US20180044996A1 (en) * 2016-08-10 2018-02-15 Cameron International Corporation Buoyancy System for Marine Riser
WO2019139483A1 (fr) 2018-01-09 2019-07-18 Mhwirth Do Brasil Equipamentos Ltda. Dispositif de fixation pour module de flottabilité de colonne montante marine

Also Published As

Publication number Publication date
GB2609980A (en) 2023-02-22
GB202111964D0 (en) 2021-10-06

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