WO2014000760A1 - Agencement pour évacuer un anneau de colonne montante - Google Patents

Agencement pour évacuer un anneau de colonne montante Download PDF

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Publication number
WO2014000760A1
WO2014000760A1 PCT/EP2012/062233 EP2012062233W WO2014000760A1 WO 2014000760 A1 WO2014000760 A1 WO 2014000760A1 EP 2012062233 W EP2012062233 W EP 2012062233W WO 2014000760 A1 WO2014000760 A1 WO 2014000760A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
permeate
annular space
recovery device
venting
Prior art date
Application number
PCT/EP2012/062233
Other languages
English (en)
Inventor
Svein LØSETH
Original Assignee
Statoil Petroleum 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 Statoil Petroleum As filed Critical Statoil Petroleum As
Priority to PCT/EP2012/062233 priority Critical patent/WO2014000760A1/fr
Publication of WO2014000760A1 publication Critical patent/WO2014000760A1/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
    • E21B17/015—Non-vertical risers, e.g. articulated or catenary-type
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • E21B43/0122—Collecting oil or the like from a submerged leakage
    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/10—Locating fluid leaks, intrusions or movements
    • E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
    • F16L11/083—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire three or more layers

Definitions

  • the present invention relates to method and an arrangement for venting an annular space between two sheaths in a riser for conveying hydrocarbons.
  • Risers Conduits to transfer materials from the seafloor to production and drilling facilities at the surface, as well as from the facility to the seafloor, are commonly termed risers.
  • Risers are a type of pipe developed for this type of vertical transportation. Risers can serve as production or import/export means and are the connection between the subsea field developments and production and drilling facilities. Similar to pipelines or flow lines, risers transport produced hydrocarbons, as well as production materials, such as injection fluids, control fluids and gas lift. Usually insulated to withstand seafloor temperatures, risers can be either rigid or flexible
  • a flexible riser is a hybrid that can accommodate a number of different situations. Flexible risers can withstand both vertical and horizontal movement, making them ideal for use with floating facilities. This flexible pipe was originally used to connect production equipment aboard a floating facility to production and export risers, but now it is found as a primary riser solution as well. There are a number of configurations for flexible risers, including the steep S and lazy S that utilize anchored buoyancy modules, as well as the steep wave and lazy wave that incorporates buoyancy modules.
  • a flexible riser comprises a central steel carcass covered by a pressure sheath that provides hydraulic integrity.
  • Numerous layers of flexible armour surround the pressure sheath, or pressure vault, to provide tensile- and hoop-stress strength.
  • the armour layers are usually separated by cushioning layers of composite or thermoplastic material to prevent them from rubbing against one another.
  • the number and size of armour layers is a function of the pressure and tensile strength specifications imposed by the particular application for which the riser is designed.
  • a final thermoplastic outer sheath provides protection towards the external environment.
  • the layers between the pressure sheath and the outer protection sheath, partly filled with steel armour, tapes is normally called the riser annulus.
  • Special riser structures may have two or more annuli.
  • GB 2481765 describes a known method for removing liquid and gas from the annulus of a flexible riser.
  • liquid permeate will condense in the annulus and fall to the base of the riser under gravity, where a column of liquid would quickly develop in the annulus.
  • a reliable venting system is required for the removal of the condensed permeate which collects at the base of the riser. This is necessary to avoid the situation where the liner experiences external overpressure and possible collapse in the event that there is a loss of internal pressure in the bore.
  • a storage tank is connected to a lowermost portion of the riser, allowing liquid to drain from the riser annulus.
  • the object of the invention is to provide an improved riser venting and drying arrangement that will provide sufficient venting and drying of the riser annulus and to reduce the partial pressure of the corrosive gases to avoid annulus corrosion fatigue and corrosion problems.
  • permeate is defined as covering any media desirable to be vented from a subsea riser.
  • Non-exhaustive examples of such media are carbon dioxide (CO 2 ), hydrogen sulphide (H 2 S) and water (H 2 O).
  • the invention relates to a riser venting arrangement in a subsea riser used for conveying hydrocarbons
  • the riser includes an inner sheath and an outer sheath separated by an annular space containing steel armouring.
  • the inner sheath is often termed pressure sheath
  • the outer sheath is an outer protective sheath.
  • the venting arrangement further comprises a permeate recovery device for recovering permeate passing through the inner sheath into the annular space by creating a sub-atmospheric pressure in the annular space, which permeate recovery device is connected to the riser.
  • the permeate recovery device further communicates with a permeate recovery line normally connected to a venting line.
  • the permeate recovery device is preferably connected adjacent an upper region of the riser, but can also be connected adjacent a lower end of the riser or at any suitable position between the upper end and the lower end.
  • a valve such as a one-way valve, is often included in the system, preventing flow from the permeate recovery line back into the annular space.
  • a suitable controllable valve can be used.
  • the valve is located downstream of the permeate recovery device.
  • a sample bottle, or a suitable storage tank for collecting condensing vapour.
  • Such a storage tank is preferably, but not necessarily, located downstream of the valve.
  • the permeate recovery device is preferably, but not necessarily, a vacuum pump.
  • a vacuum pump In order to achieve the desired sub-atmospheric pressure any suitable means or source of low pressure can be used.
  • the permeate recovery device is arranged to recover permeate in gaseous form from the annular space. As the pressure in the annular space is reduced, the partial gas pressure of the gases and liquids in the annular space is reduced, lowering the boiling point of said media. According to one example, the permeate recovery device is arranged to maintain a predetermined sub-atmospheric pressure in the annular space, which pressure is sufficient to prevent condensation of water, and other substances therein and reduce the partial pressures of corrosive and harming gases like C0 2 and H 2 S. For instance, CO 2 , H 2 S will always be is gas form at the temperatures and pressures occurring in the riser annulus.
  • a pressure sensor can be arranged to monitor the sub-atmospheric pressure in the annular space and to control operation of the permeate recovery device.
  • the pressure sensor can be connected to an electronic control unit that controls the operation of the permeate recovery device, so that a predetermined sub-atmospheric pressure can be maintained in the annular space.
  • the pressure sensor is arranged to monitor pressure variations in the annular space, indicating a leakage in the riser.
  • the riser venting arrangement is preferably, but not necessarily, intended for a flexible riser but can also be used for flexible jumpers and flow lines both topside and subsea.
  • the particular design of the layers radially inside, in and radially outside the annulus is not relevant to the invention as such.
  • the riser venting arrangement according to the invention can also be provided with a flare connected to the sample bottle, or a storage tank, wherein excess gaseous permeate can be vented from the sample bottle to the flare.
  • the invention further relates to a riser venting method used to vent a subsea riser for conveying hydrocarbons.
  • the riser includes two sheaths separated by an annular space.
  • the method is preferably adapted for use with the arrangement described above.
  • the method according to the invention comprises the steps of
  • the invention further involves drawing vapour from the annular space past a valve, such as a one-way valve, located downstream of the permeate recovery device.
  • a valve such as a one-way valve
  • Vapour drawn from the annular space passes into a permeate storage tank downstream of the permeate recovery device.
  • the permeate storage tank is downstream of the one-way valve.
  • the riser venting method involves creating and subsequently maintaining a predetermined sub-atmospheric pressure in the annular space, which pressure is sufficient to prevent condensation of permeate, such as water therein.
  • the vapour can be drawn into a storage tank such as a sample bottle.
  • the riser venting method further involves monitoring the sub-atmospheric pressure and controlling operation of the permeate recovery device. Pressure variations in the annular space can be monitored, as variations can indicate a leakage in the riser. For instance, a rate of pressure build-up that exceeds a predetermined limit during a period of non-operation of the recovery device indicates a leakage in the inner sheath or the outer sheath of the riser.
  • the source of the leakage can be determined. For instance, if the permeate comprises an increased hydrocarbon content, then the leak is located in the inner sheath. Similarly, if the permeate comprises an increased water content, then the leak is located in the outer sheath.
  • the system will also typically include a flow meter for detection of significant increase of fluid flow as this will indicate a leakage in the sheaths comprising the annulus.
  • the system can also be used for automatically or manual operated measuring of the annulus volume. This can be done by stopping the pump, typically once a year or more frequent if found appropriate, and let the annulus pressure increase to typically atmospheric pressure. When starting the pump again, the evacuated gas volume and the pressure decrease in the annulus can be measured and the annulus volume can be calculated by the gas equation.
  • Figure 1 shows a riser extending from the sea floor to a production vessel
  • Figure 2 shows a schematic diagram of a riser with a venting arrangement according to the invention.
  • Figure 3 shows a schematic illustration of the layers making up a flexible riser.
  • Figure 1 shows a flexible riser 12 extending from the sea floor to a production vessel 10. Oil is produced by subsea wells via a manifold, which passes through rigid flow lines and then flexible risers into a floating production, storage and offloading system.
  • the vessel shown in this figure is a ship, but the arrangement is applicable on any type of floating, semi-submersible of permanent production platform.
  • Flexible risers can withstand both vertical and horizontal movement, making them ideal for use with floating facilities.
  • the flexible pipe was originally used to connect production equipment aboard a floating facility to production and export risers, but can be used as a primary riser solution as well.
  • FIG. 1 indicates both a lazy wave and a steep wave arrangement of the flexible riser.
  • the riser assembly comprises a riser base1 1 located on the seabed, connected to the lower end of the flexible riser 12.
  • the flexible riser 12 comprises a carcass, a pressure barrier, pressure and tensile armours, and an outer protective sheath (not shown).
  • Figure 2 shows a schematic diagram of a riser with a venting arrangement according to the invention.
  • a riser 12 extends from a manifold (see Figure 1 ) located on the seabed to a vessel on the surface.
  • the venting arrangement further comprises a permeate recovery device 20 for recovering permeate passing through the sheaths into the annular space by creating a sub-atmospheric pressure in the annular space, which permeate recovery device 20 is connected to the riser 12 adjacent an upper region thereof.
  • the permeate recovery device is a vacuum pump 20.
  • the vacuum pump 20 communicates with a permeate recovery line 21 and a permeate storage tank 22 connected to the recovery line 21 downstream of the vacuum pump 20.
  • a one-way valve 23 is provided in the recovery line 21 between the vacuum pump 20 and the storage tank 22. The one-way valve 23 prevents flow from the permeate recovery line 21 back into the annular space.
  • the permeate recovery device is preferably, but not necessarily, a vacuum pump.
  • a vacuum pump In order to achieve the desired sub-atmospheric pressure any suitable means or source of low pressure can be used.
  • the vacuum pump 20 is arranged to recover permeate in gaseous form from the annular space. As the pressure in the annular space is reduced, the partial gas pressure of the gases and liquids in the annular space is reduced, lowering the boiling point of said media. According to one example, the permeate recovery device is arranged to maintain a predetermined sub- atmospheric pressure in the annular space, which pressure is sufficient to prevent condensation of water therein. Table 1
  • Table 1 shows the variation in boiling point (deg. F / deg. C) for water as the pressure (psi / bar) in the riser annulus is reduced.
  • the boiling point is reduced from 100 °C at 1 bar to 26,4 °C at 0,03 bar.
  • Temperature of the production fluid at the manifold 1 1 where it enters the lower end of the riser can be 100°C.
  • both C0 2 and H 2 S have higher boiling points compared to H 2 0. It is therefore water present in the annulus that governs the needed sub-atmospheric pressure.
  • the temperature in the riser annulus will vary depending on the temperature of the production fluid and the design of the riser, in particular with respect to the insulation level of the riser.
  • the annulus temperature can be within the range 30 to 80 °C. At these temperatures both C0 2 and H 2 S will be in gaseous state. Lowering the pressure in annulus will lower the partial pressures of these gases and reduce/prevent their contribution to corrosion fatigue. Continuous venting will be the preferred operating method, although intermittent venting may be used.
  • a pressure sensor 24 is arranged to monitor the sub-atmospheric pressure in the annulus and to control operation of the permeate recovery device. In this example, the pressure sensor 24 is shown at the upper end of the riser 12.
  • the pressure sensor 24 is connected to an electronic control unit 25 that controls the operation of the vacuum pump 20, so that a predetermined sub- atmospheric pressure can be maintained in the annular space.
  • the pressure sensor 24 is arranged to monitor pressure variations in the annular space, indicating a leakage in the riser 12.
  • a flow meter is arranged in the recovery line 21 downstream of the one-way valve 23, in order to monitor the flow of permeate from the riser 12.
  • the flow meter it is possible to determine the volume of the riser annulus. This can be achieved by stopping the vacuum pump and allowing the pressure to reach a predetermined level, for instance atmospheric pressure.
  • the flow meter is then used for measuring the volume of gas pumped out of the annulus to reach, for instance, half the atmospheric pressure.
  • T temperature.
  • liquid permeate can be drained into a sample bottle 26 from the conduit connected to the storage tank 22 and samples taken for monitoring.
  • the gases can be safely disposed of to the facility's gas vent system.
  • the arrangement allows measurement and analysis of permeated gas / liquid from a subsea location as opposed to directly venting to atmosphere and can ensure that the necessary venting process does not damage the environment.
  • the source of the leakage can be determined. For instance, if the permeate comprises an increased hydrocarbon content, then the leak is located in the inner sheath. Similarly, if the permeate comprises an increased water content, then the leak is located in the outer sheath.
  • the riser venting arrangement according to the invention can be provided with an optional flare (not shown) connected to the storage tank 22, wherein excess gaseous permeate can be vented from the storage tank 22 to the facility's gas vent system to the flare.
  • the riser venting arrangement is preferably, but not necessarily, intended for a flexible riser where the inner portion comprises a wound metal carcass covered by a pressure sheath and the outer portion comprises layers of flexible armour and an outer protective sheath.
  • the particular design of the flexible riser is not relevant to the invention as such.
  • the invention can be applied to any suitable riser configuration where it is desirable to vent the annulus between the pressure sheath and the outer protective sheath.
  • Figure 3 shows a schematic illustration of the layers making up a flexible riser 30.
  • the riser comprises, from the inner to the outer layer, an internal load bearing structural layer 31 arranged to prevent collapse of inner polymer layers due to pipe decompression and/or external hydrostatic pressure, often termed a carcass, a fluid tight pressure barrier 32, load bearing structural layers 33, 34 and an outer layer 35 or protective sheath.
  • the carcass forms the innermost layer of the flexible riser and is commonly made from stainless steel flat strip that is shaped and wound into an interlocking profiled tube. For certain riser applications the innermost carcass can be voided.
  • the pressure barrier is encased by a pressure amour and a tensile armour.
  • the pressure armour 33 is arranged to withstand the hoop stress in the riser wall caused by the inner fluid pressure.
  • the pressure armour is wound around the pressure barrier and comprises interlocking wires.
  • Figure 3 shows two pressure armour layers.
  • the tensile armour 34 comprises layers of flat, rectangular wires cross- wound in pairs and is used to resist tensile load on the flexible riser.
  • the outer layer 35 or protective sheath is an outer polymer sheath that can be made from the same material as the pressure barrier.
  • the outer layer 35 is a barrier against seawater and provides a level of protection for the armour layers. In this example, the annulus is located between the pressure barrier 32 and the outer layer 35.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention porte sur un agencement d'évacuation de colonne montante dans une colonne montante sous-marine (12) utilisée pour transporter des hydrocarbures, lequel agencement comprend un manchon interne (32) et un manchon externe (35) séparés par un espace annulaire. L'agencement d'évacuation comprend de plus un dispositif de récupération de perméat, tel qu'une pompe à vide (20), pour récupérer un perméat traversant les manchons dans l'espace annulaire par création d'une pression sous-atmosphérique dans l'espace annulaire, lequel dispositif de récupération de perméat est relié à la colonne montante au voisinage d'une région supérieure de celle-ci et communique avec une ligne de récupération de perméat (12) ; un réservoir de stockage de perméat (22) relié à la ligne de récupération ; et une soupape unidirectionnelle (23) dans la ligne de récupération entre le dispositif de récupération de perméat et le réservoir de stockage, empêchant un écoulement à partir de la ligne de récupération de perméat dans l'espace annulaire.
PCT/EP2012/062233 2012-06-25 2012-06-25 Agencement pour évacuer un anneau de colonne montante WO2014000760A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/062233 WO2014000760A1 (fr) 2012-06-25 2012-06-25 Agencement pour évacuer un anneau de colonne montante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/062233 WO2014000760A1 (fr) 2012-06-25 2012-06-25 Agencement pour évacuer un anneau de colonne montante

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WO2014000760A1 true WO2014000760A1 (fr) 2014-01-03

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016007017A1 (fr) * 2014-07-08 2016-01-14 4Subsea As Dispositif et procédé de contrôle du volume d'un espace annulaire dans une conduite
NO20151763A1 (en) * 2015-12-21 2017-06-22 4Subsea As Portable arrangement for automatical annulus testing
FR3085707A1 (fr) 2018-09-12 2020-03-13 Technip France Procede de determination du volume libre d'un espace annulaire d'une conduite flexible et systeme associe
WO2021108878A1 (fr) * 2019-12-05 2021-06-10 Petróleo Brasileiro S.A. - Petrobras Système et procédé de réduction de pression et de drainage de l'annulaire de conduits flexibles

Citations (9)

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US5072622A (en) * 1990-06-04 1991-12-17 Roach Max J Pipeline monitoring and leak containment system and apparatus therefor
WO2000017479A1 (fr) * 1998-09-24 2000-03-30 Nkt Flexibles A/S Tuyau tubulaire souple renforce a renvoi du liquide de fuite
US6634388B1 (en) * 1998-07-22 2003-10-21 Safetyliner Systems, Llc Annular fluid manipulation in lined tubular systems
US20080149209A1 (en) * 2003-08-14 2008-06-26 Antoine Felix-Henry Method For Removal of Permeate Gases From a Flexible Tubular Pipe and Pipe Embodied For Carrying Out the Same
WO2009106078A1 (fr) * 2008-02-25 2009-09-03 Nkt Flexibles I/S Système de tuyauterie, système de détection de fluide pour un système de tuyauterie et procédé de détermination d’un composant de fluide dans une cavité annulaire d’un tuyau
WO2010036792A2 (fr) * 2008-09-24 2010-04-01 Schlumberger Technology Corporation Procédé, dispositif, et système pour évaluer l'eau ou le liquide dans l'espace annulaire d'une colonne montante ou d'une conduite flexibles
WO2010118342A1 (fr) * 2009-04-09 2010-10-14 Schlumberger Technology Corporation Procédé et système pour la détection d'une invasion de fluide dans un espace annulaire d'un tuyau flexible
WO2011026801A1 (fr) * 2009-09-01 2011-03-10 Shell Internationale Research Maatschappij B.V. Procédé de protection anti-corrosive d'un tuyau flexible, et tuyau flexible
GB2481765A (en) 2007-04-05 2012-01-04 Technip France Apparatus for venting an annular space between a liner and a pipeline of a subsea riser

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Publication number Priority date Publication date Assignee Title
US5072622A (en) * 1990-06-04 1991-12-17 Roach Max J Pipeline monitoring and leak containment system and apparatus therefor
US6634388B1 (en) * 1998-07-22 2003-10-21 Safetyliner Systems, Llc Annular fluid manipulation in lined tubular systems
WO2000017479A1 (fr) * 1998-09-24 2000-03-30 Nkt Flexibles A/S Tuyau tubulaire souple renforce a renvoi du liquide de fuite
US20080149209A1 (en) * 2003-08-14 2008-06-26 Antoine Felix-Henry Method For Removal of Permeate Gases From a Flexible Tubular Pipe and Pipe Embodied For Carrying Out the Same
GB2481765A (en) 2007-04-05 2012-01-04 Technip France Apparatus for venting an annular space between a liner and a pipeline of a subsea riser
WO2009106078A1 (fr) * 2008-02-25 2009-09-03 Nkt Flexibles I/S Système de tuyauterie, système de détection de fluide pour un système de tuyauterie et procédé de détermination d’un composant de fluide dans une cavité annulaire d’un tuyau
WO2010036792A2 (fr) * 2008-09-24 2010-04-01 Schlumberger Technology Corporation Procédé, dispositif, et système pour évaluer l'eau ou le liquide dans l'espace annulaire d'une colonne montante ou d'une conduite flexibles
WO2010118342A1 (fr) * 2009-04-09 2010-10-14 Schlumberger Technology Corporation Procédé et système pour la détection d'une invasion de fluide dans un espace annulaire d'un tuyau flexible
WO2011026801A1 (fr) * 2009-09-01 2011-03-10 Shell Internationale Research Maatschappij B.V. Procédé de protection anti-corrosive d'un tuyau flexible, et tuyau flexible

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016007017A1 (fr) * 2014-07-08 2016-01-14 4Subsea As Dispositif et procédé de contrôle du volume d'un espace annulaire dans une conduite
GB2542997A (en) * 2014-07-08 2017-04-05 4Subsea As Device and method for monitoring of annulus volume in a pipe
US9803463B2 (en) 2014-07-08 2017-10-31 Subsea As Arrangement and method for monitoring of annulus volume
GB2542997B (en) * 2014-07-08 2020-10-28 4Subsea As Device and method for monitoring of annulus free volume in a pipe
NO20151763A1 (en) * 2015-12-21 2017-06-22 4Subsea As Portable arrangement for automatical annulus testing
WO2017111608A1 (fr) * 2015-12-21 2017-06-29 4Subsea As Système portatif destiné au test automatique d'espace annulaire
NO347540B1 (en) * 2015-12-21 2023-12-27 4Subsea As Portable arrangement for automatical annulus testing
FR3085707A1 (fr) 2018-09-12 2020-03-13 Technip France Procede de determination du volume libre d'un espace annulaire d'une conduite flexible et systeme associe
WO2020053318A1 (fr) 2018-09-12 2020-03-19 Technip France Procédé de détermination du volume libre d'un espace annulaire d'une conduite flexible et système associé
US11703413B2 (en) 2018-09-12 2023-07-18 Technip France Method for determining the free volume of an annular space of a flexible pipe and associated system
WO2021108878A1 (fr) * 2019-12-05 2021-06-10 Petróleo Brasileiro S.A. - Petrobras Système et procédé de réduction de pression et de drainage de l'annulaire de conduits flexibles

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