WO2005113929A1 - A device in connection with heave compensation - Google Patents

A device in connection with heave compensation Download PDF

Info

Publication number
WO2005113929A1
WO2005113929A1 PCT/NO2005/000169 NO2005000169W WO2005113929A1 WO 2005113929 A1 WO2005113929 A1 WO 2005113929A1 NO 2005000169 W NO2005000169 W NO 2005000169W WO 2005113929 A1 WO2005113929 A1 WO 2005113929A1
Authority
WO
WIPO (PCT)
Prior art keywords
riser
chamber
pressure
connection
heave
Prior art date
Application number
PCT/NO2005/000169
Other languages
English (en)
French (fr)
Inventor
Olav Inderberg
Hans-Paul Carlsen
Anthony D. Muff
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
Priority to US11/596,762 priority Critical patent/US20080271896A1/en
Priority to GB0625432A priority patent/GB2430458B/en
Publication of WO2005113929A1 publication Critical patent/WO2005113929A1/en

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
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • 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

Definitions

  • a device in connection with heave compensation of a pressurised riser extending between a subsea installation and a floating unit, particularly a working riser, comprising a telescopic connection with a first chamber which is in fluid connection with the interior of the riser and a second chamber.
  • a floating platform is employed which is held in position by means of anchors or dynamic positioning (DP).
  • DP dynamic positioning
  • Such a platform has to be compensated for movements caused by waves, current and wind.
  • a heave compensator is employed which keeps the riser under tension during the vessel's movements.
  • a telescopic connection is inserted with one part attached to the riser and the other part attached to the platform.
  • the riser is open, with the result that drilling mud that returns up through the riser runs over into a tank. Any volume changes due to the platform's movements are compensated for by the tank having sufficient volume to receive the mud.
  • the riser cannot be open, since the interior of the riser is under pressure, corresponding to the pressure in the well.
  • it has not been common practice to equip working risers with telescopic joints since the high internal pressure in the riser will attempt to force the telescopic joint into its extreme position, thereby neutralizing the function of the telescopic joint.
  • a pressure safety element since there is well pressure in the riser, a pressure safety element, called a surface-mounted wellhead Christmas tree, must be mounted on the top of the riser. It is therefore common practice to suspend the Christmas tree from the platform's derrick and mount the heave compensator for the riser in connection therewith. Since the Christmas tree is attached to the riser, on account of the wave movements the platform will move relative to the Christmas tree, thereby impeding work on the Christmas tree. Necessary operations, such as the insertion of equipment through the Christmas tree have therefore been performed by personnel being suspended from the derrick in a working harness, which is a hazardous operation that has resulted in many accidents. In NO patent no. 315 807 a method is described for avoiding such dangerous situations.
  • the riser is equipped with a telescopic joint. During operations this is locked in one position, with the result that the Christmas tree will move relative to the platform deck.
  • equipment When equipment has to be inserted in the riser, it is firstly lowered until it rests against the seabed. The lock is released and the telescopic joint brought into its central position. The upper part can then be caused to stand still relative to the platform, thereby enabling personnel to perform work in connection with the Christmas tree.
  • the disadvantage of this method is that all work in the well must be interrupted when the telescopic joint is placed in this operating position.
  • Another disadvantage is that the riser has to be supported at the bottom, which may result in unacceptable bending stresses.
  • the present invention is based on a principle known from US patent publication no. 2 373 280 wherein a telescopic joint, which is intended to absorb changes in the length of a pipe carrying fluids under pressure, is equipped with oppositely-directed piston surfaces that provide a resultant pressure equal to zero, thus preventing the pressure from causing changes in the length of the pipe.
  • An object of the present invention is to provide a system that solves at least some of the above-mentioned problems.
  • a further object is to provide a system where the surface tree can stand still relative to the platform while work is in progress, while at the same time maintaining a substantially constant tension in a main part of the riser.
  • the above-mentioned problems are solved by the second chamber being connected to a source of pressurised fluid with pressure and volume being varied so that heave is actively compensated for the upper part of the riser.
  • the upper part of the riser can thereby be actively regulated relative to the other part of the riser in order to keep the other part under constant tension and/or the upper part can be actively regulated relative to the floating unit during work that requires the surface tree to be stationary relative to the floating unit or other equipment employed for performing the work.
  • the upper part of the riser and the Christmas tree can thereby be accessible under all conditions, including when the tool is located down in the well and can be optimised with regard to their movement in order to avoid unnecessary stresses on the riser system and related equipment.
  • An advantage of the invention is that it can also be employed for active heave compensation of the riser, thereby avoiding the use of the known tension rods and accumulators for heave compensation.
  • the upper part of the riser may be actively controlled as required with regard to heave and the lower part of the riser may comprise a separate device for heave compensation of this part independent of the upper part of the riser.
  • a device according to the invention will also comprise, or alternatively be connected with, related equipment that can provide automatic control as a consequence of signals received from one or more sensors, or an arrangement for manual control and/or a combination thereof.
  • Fig. 1 is a schematic view of a typical working riser
  • Fig. 2 illustrates a telescopic joint with a diagram for controlling the telescopic joint.
  • the riser system illustrated in fig. 1 is of a type that is normally called an intervention riser or working riser, i.e. it is arranged to be employed during operations in a well after the well is completed and put into production. This may involve, for example, operations for lowering or retrieving equipment to and from the well, stimulating the well with chemical or mechanical agents, etc.
  • a riser of this kind is arranged to withstand high pressure but is normally smaller than the riser employed in drilling operations and usually has an external diameter of 14".
  • the configuration illustrated in fig. 1 is only intended as an example of such types of risers and it will be appreciated that it may comprise more parts, or that other parts may replace those illustrated.
  • the riser is shown attached to the upper part of a subsea Christmas tree 1 , which in turn is connected to a wellhead 2 which is fixed in a guide base 3. The latter forms the foundation of the well 4 and rests on the seabed 5.
  • the riser system From the bottom up the riser system comprises a lower riser package (LRP) 6, an emergency quick disconnect piece (EQDP) 7, a bending joint 8, the pipe 9 and a telescopic joint 10.
  • the riser pipe 9 consists of a number of pipes that are screwed together or interconnected in some other way to form an elongate column.
  • attachment means for wires 24 which in turn are attached to a tension-based heave compensating system. This is a commonly known arrangement for keeping the riser under tension and implemented in order to avoid excessive loading stresses on the well.
  • the vessel has a main deck or drill floor 13, which is the primary working area on the vessel and a moon pool 14 through which equipment is lowered to the seabed. .
  • the upper parts of the riser system comprise an adapter connection 15, which forms a transition between the riser 9 and a tension frame 16, which in turn is suspended in the rig's drive gear 17. Inside the tension frame 16 are mounted a surface
  • the vessel further comprises non-illustrated derricks, cranes and other equipment ' normally found on a vessel.
  • an operations centre with an operator who supervises the operations in the well.
  • an intelligent control unit that receives and processes data, and is employed for controlling the heave compensating system, as will be described in greater detail in the following section.
  • a number of critical components are provided with meters for measuring their condition.
  • the result of the measurements is transmitted, preferably in real time, to the control unit in the operations centre where the signals are received and processed in the computer.
  • the critical parameters that require to be measured are primarily the vessel's position, either by measuring the vessel's geographical position by means of a GPS system or by measuring the angle of the riser, or possibly both. Even though the riser's angular deviation from the vertical can be calculated on the basis of the vessel's position, it is desirable to measure it as well, since it provides a verification of the DP system's reliability.
  • a number of parameters in the heave compensating system are measured, such as the riser's height above the drill floor, the so-called “stick-up” and the change rate for stick-up.
  • the piston's position in the cylinder requires to be measured, particularly if it is located near the extreme points of the stroke, together with the change rate, i.e. how fast the piston is moving.
  • meters are provided in the actual heave compensation.
  • the telescopic joint is designed in such a manner that it can function as active heave compensation, as a replacement for, or in addition to, the standard tension-based heave compensation illustrated in fig. 1. As illustrated in fig.
  • the telescopic joint consists in the known manner of an internal telescopic pipe 30 attached to the riser 9 and an external pipe 40 attached to the adapter connector 15 (in fig. 1).
  • the telescopic pipe 30, and possibly the riser 9, may be equipped with a flange that forms an attachment point for the tension wires 24 (in fig. 1).
  • the telescopic pipe 30 has an additional protruding flange with a lower surface 33, an upper surface 34 and an external surface 35.
  • the surface 34 has an area A 5 and the surface 33 has an area A 2 .
  • One or more seals 36 are mounted in the surface 35.
  • the telescopic pipe 30 has an internal diameter equal to the riser's 9 internal diameter and has an inner surface 37 and an outer surface 38.
  • the outer part 40 of the telescopic joint comprises an upper part 42 with an inner surface 43 arranged to slide towards the outer surface 38 of the internal telescopic joint. From the upper part 42 there is attached a pipe 44 with an inner surface 45 arranged to slide towards the outer surface 35 of the protruding flange. At the bottom (as viewed in the figure) the pipe 44 is provided with an inwardly directed flange 48 with an inner surface 49 arranged to slide towards the pipe's 30 outer surface 38. The transition between the upper part 42 and the pipe 44 forms a shoulder with a downwardly- facing surface 52 with an area A .
  • the end flange 48 has an upwardly-directed surface 54 with an area A 3 .
  • an opening 56 is provided in the pipe 44.
  • Packers 51 and 53 mounted in the end flange 48 and the upper part respectively provide a seal against the pipe's outer surface 38.
  • the surfaces 33, 38, 45 and 54 define a first piston chamber 60, which via the holes 39 is connected with the interior of the riser.
  • the surfaces 38, 34, 45 and 52 define a second piston chamber 62, which via the hole 56 is connected with a line 70, which in turn connects the chamber 62 with a device for regulating pressure and volume in the piston chamber 62.
  • the fluid line 70 leads to a reversible valve 72, which can be regulated between two positions. In the valve's first position the line 70 is connected with a fluid reservoir 80 via a line 74.
  • a controlled throttle valve 75 is advantageously mounted in the line 74.
  • the chamber 62 with the valve can thereby be vented to the environment and the heave compensator is in its passive mode.
  • the line 70 is connected with a circuit comprising a first line 76 that is connected with the fluid reservoir 80.
  • a controlled pressure-regulating valve for example a throttle valve 77, is mounted in the line 76.
  • a pump 82 is mounted in the second line 78 .
  • the pump 82 is driven by a motor 83.
  • the pump 82 is supplied with fluid from the reservoir 80 via the line 84.
  • An accumulator 83 is advantageously provided in the line 78 for equalising minor pressure pulses during start-up and stopping of the pump 74.
  • a pressure-controlled check valve 85 is advantageously mounted in the line 78.
  • a number of sensors are mounted in connection with the heave compensating system. These comprise a pressure sensor 91 in connection with the chamber 60 and a flow meter 92 in the line 70. Furthermore, the control unit 90 receives signals from the DP system 93 and from a heave sensor 94 as previously mentioned.
  • the heave sensor 94 may be an accelerometer, a length meter or a position sensor. The values from these measurements are transmitted to the control unit 90.
  • the control unit comprises a programmable unit that processes the said signals and in response thereto controls the pump 82, the control valve 72 and the throttle valves 75 and 77.
  • the telescopic joint is so designed that it is volume and force-compensated. This is achieved by designing the chamber 60 in such a way that the area A 3 is approximately equal to the area Ai corresponding to the pipe's 10 internal cross sectional area, which in turn is the theoretical area that is formed by the closed top of the riser, indicated in fig. 2 by the line 27. Since the riser is at all times under well pressure, it must be closed at the upper end in order to avoid blow-out; in reality this is in the area of the surface Christmas tree, but for the sake of clarity it is illustrated by the dotted line 27.
  • Changes in fluid volume in the riser are compensated for by the ability of fluid to flow in and out of the chamber 60.
  • the riser is thereby pressure balanced, thus preventing the occurrence of pressure pulses as a result of the volume changes caused by heave movements.
  • the chamber 62 can act as passive length compensation. In the case of active compensation, fluid is pumped into the chamber in response to the movements in the platform and controlled in the control unit.
  • the chamber 42 can be controlled so as to cushion a recoil caused by the upwardly- directed force in the riser, thereby preventing the telescopic joint from touching the bottom and causing damage to the platform.
  • the heave compensator behaves like a standard type of heave compensator, as is also known from NO 169 027.
  • the control system for the telescopic joint may also be programmed to keep the surface Christmas tree at a predetermined height above deck, thus enabling operations to be carried out while the operator is in a safe position.
  • the system may be provided with an alarm that gives a warning when there is a risk of the Christmas tree moving outside of fixed limits.
  • a further function of the invention is that the traditional tension-based heave compensating system can either be replaced by or combined with the active control of the pressure in the chamber 62.
  • An increase in the pressure in the chamber 62 will give an increased tension in the riser and this can be employed as an alternative heave compensating system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Actuator (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

Foreliggende oppfinnelse omhandler en hivkompensator for et stigeror, saerlig et arbeidsstigeror (9), omfattende en teleskopforbindelse (10) med et forste kammer (60) som står i fluidforbindelse med det indre av stigeroret og et andre kammer (62) som står i forbindelse med en kilde for trykkfluid. Ved å variere trykket i det andre kammer som respons av bevegelsene av plattformen kan teleskopforbindelsen innrettes til å bevege seg i samsvar med plattformens bevegelser og dermed tillate adgang til stigeroret under arbeidsoperasjoner.
PCT/NO2005/000169 2004-05-21 2005-05-23 A device in connection with heave compensation WO2005113929A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/596,762 US20080271896A1 (en) 2004-05-21 2005-05-23 Device in Connection with Heave Compensation
GB0625432A GB2430458B (en) 2004-05-21 2005-05-23 A Device in Connection with Heave Compensation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20042096A NO322172B1 (no) 2004-05-21 2004-05-21 Anordning i forbindelse med hivkompensering av et trykksatt stigeror forlopende mellom en havbunnsinstallasjon og en flytende enhet.
NO20042096 2004-05-21

Publications (1)

Publication Number Publication Date
WO2005113929A1 true WO2005113929A1 (en) 2005-12-01

Family

ID=35005875

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2005/000169 WO2005113929A1 (en) 2004-05-21 2005-05-23 A device in connection with heave compensation

Country Status (4)

Country Link
US (1) US20080271896A1 (no)
GB (1) GB2430458B (no)
NO (1) NO322172B1 (no)
WO (1) WO2005113929A1 (no)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008051092A1 (en) * 2006-10-27 2008-05-02 Fmc Kongsberg Subsea As Telescopic joint
WO2009061211A3 (en) * 2007-11-09 2009-08-13 Fmc Kongsberg Subsea As Riser system comprising pressure control means
WO2010090531A1 (en) * 2009-02-09 2010-08-12 Fmc Kongsberg Subsea As Trigger joint
WO2012076703A2 (en) 2010-12-10 2012-06-14 Statoil Petroleum As Riser coupling
WO2012016765A3 (en) * 2010-06-30 2013-02-07 Aker Mh As A method and a system for controlling movements of a free-hanging tubular
WO2012066268A3 (en) * 2010-11-18 2013-05-16 National Oilwell Varco Norway As A heave compensating system
WO2013162563A1 (en) * 2012-04-26 2013-10-31 Bp Corporation North America Inc. Subsea telescoping and rotatable sub
RU2624469C2 (ru) * 2012-11-20 2017-07-04 Акер Сабси АС Слабое звено для водоотделяющей системы

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2015201236B2 (en) * 2009-02-09 2016-05-12 Fmc Kongsberg Subsea As Trigger joint
US8322433B2 (en) * 2009-06-01 2012-12-04 Schlumberger Technology Corporation Wired slip joint
EP2423429A1 (en) * 2010-08-31 2012-02-29 Vetco Gray Controls Limited Valve condition monitoring
US8746351B2 (en) 2011-06-23 2014-06-10 Wright's Well Control Services, Llc Method for stabilizing oilfield equipment
US9528328B2 (en) * 2012-01-31 2016-12-27 Schlumberger Technology Corporation Passive offshore tension compensator assembly
US9650856B2 (en) * 2013-11-12 2017-05-16 Cameron International Corporation Assembly and system including a surge relief valve
US9416620B2 (en) * 2014-03-20 2016-08-16 Weatherford Technology Holdings, Llc Cement pulsation for subsea wellbore
US9440829B2 (en) * 2014-04-08 2016-09-13 MHD Offshore Group SDN. BHD. Adjusting damping properties of an in-line passive heave compensator
EP3277906B1 (en) * 2015-03-31 2020-06-10 Noble Drilling Services, Inc. Method and system for lubricating riser slip joint and containing seal leakage
BR112019025337B1 (pt) * 2017-05-30 2022-04-26 Trendsetter Vulcan Offshore, Inc Métodos para construir e completar um poço e para operações de recondicionamento ou intervenção com um poço
US11208862B2 (en) 2017-05-30 2021-12-28 Trendsetter Vulcan Offshore, Inc. Method of drilling and completing a well
NO345357B1 (en) * 2019-04-10 2020-12-21 Odfjell Drilling As A heave compensating system for a floating drilling vessel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643751A (en) * 1969-12-15 1972-02-22 Charles D Crickmer Hydrostatic riser pipe tensioner
US5069488A (en) * 1988-11-09 1991-12-03 Smedvig Ipr A/S Method and a device for movement-compensation in riser pipes
US5209302A (en) * 1991-10-04 1993-05-11 Retsco, Inc. Semi-active heave compensation system for marine vessels

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2373280A (en) * 1943-07-06 1945-04-10 Phillips Petroleum Co Nonthrusting pipe expansion joint
US3196958A (en) * 1960-04-04 1965-07-27 Richfield Oil Corp Offshore drilling method and apparatus
US3179179A (en) * 1961-10-16 1965-04-20 Richfield Oil Corp Off-shore drilling apparatus
US3211224A (en) * 1963-10-09 1965-10-12 Shell Oil Co Underwater well drilling apparatus
US3353851A (en) * 1963-11-26 1967-11-21 Pan American Petroleum Corp Pneumatic cylinder for applying tension to riser pipe
US3955621A (en) * 1975-02-14 1976-05-11 Houston Engineers, Inc. Riser assembly
US4176722A (en) * 1978-03-15 1979-12-04 Global Marine, Inc. Marine riser system with dual purpose lift and heave compensator mechanism
JPS59177494A (ja) * 1983-03-29 1984-10-08 工業技術院長 ライザ用テレスコピツクジヨイント
US4712620A (en) * 1985-01-31 1987-12-15 Vetco Gray Inc. Upper marine riser package
NO302493B1 (no) * 1996-05-13 1998-03-09 Maritime Hydraulics As Glideskjöt
DE19645407A1 (de) * 1996-11-04 1998-05-07 Voith Sulzer Papiermasch Gmbh Schuhpresse
US5846028A (en) * 1997-08-01 1998-12-08 Hydralift, Inc. Controlled pressure multi-cylinder riser tensioner and method
CA2407233C (en) * 2000-05-15 2009-03-10 Cooper Cameron Corporation Automated riser recoil control system and method
NO315807B3 (no) * 2002-02-08 2008-12-15 Blafro Tools As Fremgangsmate og anordning ved arbeidsrorkopling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643751A (en) * 1969-12-15 1972-02-22 Charles D Crickmer Hydrostatic riser pipe tensioner
US5069488A (en) * 1988-11-09 1991-12-03 Smedvig Ipr A/S Method and a device for movement-compensation in riser pipes
US5209302A (en) * 1991-10-04 1993-05-11 Retsco, Inc. Semi-active heave compensation system for marine vessels

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2456706B (en) * 2006-10-27 2011-05-18 Fmc Kongsberg Subsea As Telescopic joint
GB2456706A (en) * 2006-10-27 2009-07-29 Fmc Kongsberg Subsea As Telescopic joint
WO2008051092A1 (en) * 2006-10-27 2008-05-02 Fmc Kongsberg Subsea As Telescopic joint
US9022127B2 (en) 2007-11-09 2015-05-05 Fmc Kongsberg Subsea As Riser system comprising pressure control means
EP2535503A3 (en) * 2007-11-09 2013-07-10 FMC Kongsberg Subsea AS Riser system comprising pressure control means.
WO2009061211A3 (en) * 2007-11-09 2009-08-13 Fmc Kongsberg Subsea As Riser system comprising pressure control means
AU2010211446B2 (en) * 2009-02-09 2015-07-16 Fmc Kongsberg Subsea As Trigger joint
WO2010090531A1 (en) * 2009-02-09 2010-08-12 Fmc Kongsberg Subsea As Trigger joint
EP2863005A1 (en) * 2009-02-09 2015-04-22 FMC Kongsberg Subsea AS Trigger joint
US8875794B2 (en) 2009-02-09 2014-11-04 Fmc Kongsberg Subsea As Trigger joint
RU2516352C2 (ru) * 2009-02-09 2014-05-20 Фмс Конгсберг Сабси Ас Соединительный узел водоотделяющей колонны
WO2012016765A3 (en) * 2010-06-30 2013-02-07 Aker Mh As A method and a system for controlling movements of a free-hanging tubular
GB2495652A (en) * 2010-06-30 2013-04-17 Aker Mh As A method and a system for controlling movements of a free-hanging tubular
CN103038438A (zh) * 2010-06-30 2013-04-10 阿克Mh股份有限公司 用于控制自由悬挂管的运动的方法和系统
CN103038438B (zh) * 2010-06-30 2016-01-20 阿克Mh股份有限公司 用于控制自由悬挂管的运动的设备、方法和系统
WO2012066268A3 (en) * 2010-11-18 2013-05-16 National Oilwell Varco Norway As A heave compensating system
US9267340B2 (en) 2010-11-18 2016-02-23 National Oilwell Varco Norway As Heave compensating system
WO2012076703A2 (en) 2010-12-10 2012-06-14 Statoil Petroleum As Riser coupling
WO2013162563A1 (en) * 2012-04-26 2013-10-31 Bp Corporation North America Inc. Subsea telescoping and rotatable sub
RU2624469C2 (ru) * 2012-11-20 2017-07-04 Акер Сабси АС Слабое звено для водоотделяющей системы

Also Published As

Publication number Publication date
US20080271896A1 (en) 2008-11-06
GB2430458A (en) 2007-03-28
GB2430458B (en) 2008-12-24
GB0625432D0 (en) 2007-02-07
NO20042096L (no) 2005-11-22
NO20042096D0 (no) 2004-05-21
NO322172B1 (no) 2006-08-21

Similar Documents

Publication Publication Date Title
US20080271896A1 (en) Device in Connection with Heave Compensation
EP2378056B1 (en) Drilling fluid pressure control system for a floating rig
US7686544B2 (en) Method and arrangement by a workover riser connection
CA2704629C (en) Riser system comprising pressure control means
US7231981B2 (en) Inline compensator for a floating drill rig
AU2023200587A1 (en) Compensated Elevator Link
EP3227520B1 (en) Heave compensation method
WO2020067905A1 (en) Coil tubing injector integrated heave compensation and a coil tubing heave compensation method
US20160290071A1 (en) Integral Self-Contained Drillstring Compensator
KR20150000168A (ko) Bop 장비 테스트 장치 및 방법
MXPA06003944A (en) Inline compensator for a floating drilling rig
KR20150011082A (ko) 시추 장비 테스트 장치 및 방법

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

WWE Wipo information: entry into national phase

Ref document number: 0625432.0

Country of ref document: GB

Ref document number: 0625432

Country of ref document: GB

122 Ep: pct application non-entry in european phase
WWE Wipo information: entry into national phase

Ref document number: 11596762

Country of ref document: US