EP1485571A1 - A triggering mechanism for disconnecting a riser from a riser connector - Google Patents
A triggering mechanism for disconnecting a riser from a riser connectorInfo
- Publication number
- EP1485571A1 EP1485571A1 EP03701952A EP03701952A EP1485571A1 EP 1485571 A1 EP1485571 A1 EP 1485571A1 EP 03701952 A EP03701952 A EP 03701952A EP 03701952 A EP03701952 A EP 03701952A EP 1485571 A1 EP1485571 A1 EP 1485571A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flex joint
- riser
- stationary part
- triggering
- hydraulic cylinders
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 230000000994 depressogenic effect Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000000383 hazardous chemical Substances 0.000 description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
Definitions
- the invention relates to a triggering mechanism for a triggering valve of a hydraulic emergency unlock circuit for unlocking hydraulically operated gripping members of a riser connector which connects a lower end of a riser to a wellhead on a sea floor.
- Drilling of offshore hydrocarbon wells is performed by a drill string arranged in a riser extending from a wellhead on the sea floor to a drilling vessel.
- the drilling vessel may be anchored to the sea floor or kept in position by thrusters of a dynamic positioning system.
- the lower end of the riser is connected to the wellhead by a riser connector, which includes some type of hydraulically operated gripping members, such as fingers which in a locked position clamp a flange of the lower end of the riser.
- Connectors which may be used for connecting a riser to a wellhead is disclosed in US 4 721 132, US 5 382 056 and US 6 234 252.
- the riser In order to allow a movement of the drilling vessel, which may be caused by wind, waves and current, the riser is normally connected to the riser connector via a flex joint which allows some angular displacement of the riser. If the angular displacement of the riser exceeds a maximum acceptable angle, dictated by maximum allowable stresses in the wellhead, the riser or the drilling vessel, the riser will be disconnected from the wellhead, which is carried out by a hydraulic circuit which unlock the hydraulically operated gripping members of the riser connector.
- the hydraulic circuit which unlocks the hydraulically operated gripping members may fail, and it is therefore preferred to have an emergency unlock circuit for unlocking the gripping members. Further, to ensure a high reliability, the activating of the emergency unlock circuit should be reliable and independent of any external connections or signals.
- the object of the invention is thus to provide a triggering mechanism for a triggering valve of a hydraulic emergency unlock circuit for unlocking hydraulically operated gripping members of a riser connector which connects a lower end of a riser to a wellhead on a sea floor, which triggering mechanism shall be reliable, and the triggering shall be independent of any external connections or signals.
- a triggering mechanism according to claim 1.
- the inventive triggering mechanism is used together with a riser connector as discussed above.
- Angular displacement of the riser is allowed by a flex joint comprising a stationary part clamped by the gripping members and an angularly displaceable part secured to the lower end of the riser.
- the stationary part of the flex joint and the displaceable part of the flex joint are coaxial when the riser is in a non- displaced position.
- the triggering mechanism comprises a cam ring which is secured to the displaceable part of the flex joint, and which is coaxial with the displaceable part of the flex joint.
- the triggering mechanism comprises hydraulic cylinders which are secured to the stationary part of the flex joint, which are parallel with an axis of the stationary part of the flex joint, and which are arranged in a circle which is coaxial with the stationary part of the flex joint.
- the hydraulic cylinders have through-going piston rods, and an actuator ring is mechanically connected to ends of the piston rods which point towards the cam ring.
- the actuator ring is thus coaxial with the stationary part of the flex joint, and thus the cam ring and the actuator ring are parallel when the stationary part of the flex joint and the displaceable part of the flex joint are coaxial.
- the actuator ring have a clearance to the cam ring.
- Pistons divide the hydraulic cylinders in upper and lower chambers, the upper chambers being on the actuator ring side of the pistons, the through-going piston rods ensure equal cross-sectional area in the upper and lower chambers. Further cross-connecting conduits connect upper chambers with lower chambers in oppositely located hydraulic cylinders.
- a trigger for the triggering valve is located on the stationary part of the flex joint, between the stationary part of the flex joint and the actuator ring.
- An angular displacement of the riser will cause an angular displacement of the cam ring.
- the cam ring contacts the actuator ring and forces the actuator ring towards the stationary part of the flex joint, which causes movement of the piston rods and the pistons.
- the movement of the pistons causes hydraulic flow in the cross-connecting conduits, which ensure equal movement of pistons and piston rods in oppositely located hydraulic cylinders.
- the actuator ring thereby moves translatory, and activates the trigger for the triggering valve, irrespectively of the direction of the angular displacement of the riser.
- a triggering mechanism made by simple mechanical and hydraulic components, which make the mechanism reliable. Further the triggering is caused by a direct and simple mechanical transfer of the angular displacement of the riser, independent of any external connections or signals.
- fig. 1 is a side view of a flex joint and a triggering mechanism according to the invention
- fig. 2 illustrates the triggering mechanism in closer detail
- fig. 3 illustrates two cross-connected hydraulic cylinders forming parts of the inventive mechanism
- fig. 4 illustrates a trigger for a triggering valve.
- Fig. 1 is a side view of a flex joint which connects a riser to a riser connector.
- the flex joint comprises a stationary part formed by a hub 3.
- a lower not illustrated portion of the hub 3 is by means of not illustrated hydraulically operated gripping members clamped in a not illustrated riser connector arranged below the hub 3.
- the riser connector forms an upper part of a not illustrated wellhead on a sea floor, which wellhead forms an upper part of a not illustrated hydrocarbon well.
- the gripping members may consist of fingers or dogs which in a locked position exert a clamping force on the lower part of the hub 3, which may have grooves corresponding to the fingers.
- the flex joint further comprises a flexible element 14, which may include steel- reinforced rubber.
- the flexible element 14 holds an angularly displaceable neck 15 which is integral with a flange 4.
- the flange 4 is by means of bolts 17 and nuts 18 connected to a riser flange 16, which is integral with a riser 2.
- the neck 15 and the flange 4 thereby constitute an angularly displaceable part of the flex joint.
- the stationary part 3 of the flex joint has an axis 32, while the displaceable part 4 of the flex joint has an axis 33.
- the displaceable part 4 of the flex joint is in a non- displaced position, the axes 32 and 33 coincide.
- the riser 2 extends to a not illustrated drilling vessel, and drilling of the hydrocarbon well is carried out by a drill string extending from the drilling vessel through the riser 2, through not illustrated openings in the flanges 16 and 4, the neck 15 and the flexible element 14, and further down through the riser connector and the wellhead. Due to wind, waves and current, the drilling vessel may move, which causes an angular displacement of the riser 2, as illustrated in fig. 1, in which the riser 2 has been displaced by an angle ⁇ . The angle will normally be monitored by a sensor (not illustrated). If the angle ⁇ exceeds a maximum acceptable angle, which may be caused by harsh weather or a failure in the positioning system for the drilling vessel, the riser will be disconnected from the wellhead. This disconnection is carried out by an automatic or manual activating of a hydraulic circuit which unlock the gripping members of the riser connector.
- the hydraulic circuit which unlock the gripping members may fail, in which case the angular displacement ⁇ of the riser will increase beyond the maximum acceptable angle.
- a hydraulic emergency unlock circuit for unlocking the hydraulically operated gripping members.
- the emergency unlock circuit should be pressurised by hydraulic accumulators located within or close to the wellhead.
- the invention relates to a triggering mechanism for a triggering valve of the hydraulic emergency unlock circuit.
- the emergency unlock circuit may be designed in any manner known to a skilled person.
- Fig. 2 illustrates the triggering mechanism in closer detail.
- the triggering mechanism comprises a cam ring 5 which is welded to an attachment ring 19 which is bolted to the flange 4 by the bolts 17 and the nuts 18.
- the cam ring 5 is thereby secured to the displaceable part of the flex joint and is coaxial with the displaceable part of the flex joint.
- Hydraulic cylinders 6, 6' are secured to the stationary part of the flex joint, i.e. the hub 3, by bolts 22 extending through flanges 21 of the hydraulic cylinders 6, 6'.
- the hydraulic cylinders 6, 6' are parallel with the axis 32 of the hub 3, and are arranged in a circle which is coaxial with the hub 3.
- the hydraulic cylinders are distributed along their circle, and although only two hydraulic cylinders are illustrated in fig. 1, there are a number of hydraulic cylinders forming the circle.
- Fig. 3 illustrates two hydraulic cylinders 6, 6'.
- the hydraulic cylinders are provided with through-going piston rods 7, 7'.
- An actuator ring 8 (not illustrated in fig. 3) is mechanically connected to ends of the piston rods 7, 7' pointing towards the cam ring 5. This mechanical connection is achieved by pins 25 in the ends of the piston rods, which pins are secured in openings in the actuator ring 8, e.g. by means of welding.
- a stiffening ring 20 is welded to the actuator ring.
- a cross-connecting conduit 12 connects upper chamber 10 of the right hydraulic cylinder 6 with lower chamber 11' of the left hydraulic cylinder 6', and a cross-connecting conduit 12' connects upper chamber 10' of the left hydraulic cylinder 6' with lower chamber 1 1 of the right hydraulic cylinder 6.
- the cross-connecting conduits are not illustrated in fig. 1 and 2.
- a downward movement of piston rod 7 in the right hydraulic cylinder 6 causes hydraulic fluid to flow from lower chamber 1 1 of the right hydraulic cylinder 6, through cross-connecting conduit 12', and into upper chamber 10' of the left hydraulic cylinder 6'.
- the hydraulic cylinders 6 and 6' are oppositely located. As discussed, there are more hydraulic cylinders located in the circle of cylinders. These other hydraulic cylinders also form similar pairs of oppositely located co-acting hydraulic cylinders interconnected by cross-connecting conduits.
- the hydraulic cylinders have a number of six and are equally spaced along their circle, forming three pairs, each pair consisting of two oppositely located cross-connected hydraulic cylinders.
- Fig. 4 illustrates a trigger for the triggering valve 1, mounted to the hub 3, between the hub 3 and the actuator ring 8.
- the triggering mechanism functions as follows: An angular displacement ⁇ of the riser 2 causes an identical angular displacement ⁇ of the cam ring 5, and when the angular displacement ⁇ of the riser and the cam ring 5 exceeds a predetermined, maximum acceptable angle, the cam ring 5 contacts the actuator ring 8 and forces the actuator ring 8 towards the hub 3, as illustrated in fig. 1 and 2. As discussed above, due to the hydraulic cylinders and the cross-connecting conduits, the actuator ring 8 thereby moves translatory towards the hub 3. The actuator ring 8 contacts and activates the trigger for the triggering valve 1, which causes an activating of the hydraulic emergency unlock circuit, which unlocks the hydraulically operated gripping members of the riser connector.
- Fig. 4 illustrates a preferred trigger, formed by a valve stem 13 of the triggering valve 1.
- the valve 1 is a standard hydraulic valve, and is included in the emergency unlock circuit by hydraulic tubing 27 and 28. In fig. 4 the valve 1 is closed, i.e. there is no connection between tubing 27 and 28. If the valve stem 13 is depressed, the valve is opened, i.e. a connection between tubing 27 and 28 is established, and the emergency unlock circuit is activated.
- the triggering valve 1 is located in a recess 29 in the hub 3, and the valve stem 13 is extending through and guided by a bore 26 in the hub 3.
- a valve stem plate 30 is attached on top of the valve stem 13, and a spring 31 is compressed between the hub 3 and the valve stem plate 30. The spring 31 thereby biases the valve stem 13 upwards, into the position illustrated in fig. 4, in which the triggering valve 1 is closed.
- the actuator ring 8 When the actuator ring 8 is moved downwards by the cam ring 5, as discussed above, the actuator ring 8 contacts the valve stem plate 30, and presses the valve stem plate 30 and the valve stem 13 down, which opens the valve 1, which opens an initialising flow in the emergency unlock circuit.
- Fig. 1 and 2 illustrate an embodiment of the invention in which the triggering mechanism is realised by separate components mounted to the hub 3.
- the hydraulic cylinders 6, 6' may be formed by bores in the hub 3.
- the cross- connecting conduits 12, 12' may be formed by channels in the hub 3. In this way the mechanism will be integrated in the hub 3, and the mechanism will thereby be better protected from environmental hazards, e.g. falling objects
- Fig. 4 illustrates a trigger for the triggering valve which is essentially integrated in the hub 3, and which is thereby essentially protected from environmental hazards.
Landscapes
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Escalators And Moving Walkways (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Actuator (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US60319 | 1979-07-25 | ||
NO20020534 | 2002-02-01 | ||
US10/060,319 US6568476B1 (en) | 2002-02-01 | 2002-02-01 | Triggering mechanism for disconnecting a riser from a riser connector |
NO20020534A NO316331B1 (en) | 2002-02-01 | 2002-02-01 | Release mechanism for releasing a riser from a riser connector |
PCT/NO2003/000031 WO2003064809A1 (en) | 2002-02-01 | 2003-02-03 | A triggering mechanism for disconnecting a riser from a riser connector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1485571A1 true EP1485571A1 (en) | 2004-12-15 |
EP1485571B1 EP1485571B1 (en) | 2007-10-17 |
Family
ID=27667631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03701952A Expired - Lifetime EP1485571B1 (en) | 2002-02-01 | 2003-02-03 | A triggering mechanism for disconnecting a riser from a riser connector |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1485571B1 (en) |
AT (1) | ATE376118T1 (en) |
DE (1) | DE60316923D1 (en) |
DK (1) | DK1485571T3 (en) |
ES (1) | ES2297124T3 (en) |
PT (1) | PT1485571E (en) |
WO (1) | WO2003064809A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO321184B1 (en) * | 2004-09-02 | 2006-04-03 | Fmc Kongsberg Subsea As | Device for safety rudder for a rudder |
DE102005055515A1 (en) * | 2005-07-26 | 2007-02-01 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Sensor arrangement and method for detecting the resting of an operator body part on an actuating point of a motor vehicle closing device with a sensor-assisted evaluation of the output signal of a proximity sensor |
US8414342B2 (en) | 2008-01-18 | 2013-04-09 | Single Buoy Moorings, Inc. | Steel pipeline fluid transfer system |
NO329804B1 (en) | 2009-02-09 | 2010-12-20 | Fmc Kongsberg Subsea As | Link for use in a riser, riser with such a link and method for increasing the operating window of a riser |
NO333849B1 (en) * | 2010-04-28 | 2013-09-30 | Statoil Petroleum As | Safety device and method for protecting the well barrier. |
NO332448B1 (en) | 2010-05-21 | 2012-09-17 | Statoil Petroleum As | Mechanically resilient weak joint |
NO338526B1 (en) * | 2010-11-30 | 2016-08-29 | Vetco Gray Scandinavia As | Safety coupling and riser which includes such a safety coupling |
NO332606B1 (en) * | 2011-03-11 | 2012-11-19 | Aker Subsea As | Coupling with bias |
EA201301092A1 (en) * | 2011-05-03 | 2014-03-31 | Бп Корпорейшн Норт Америка Инк. | REGULATORY AND RETAINABLE SYSTEM FOR UNDERWATER FLEXIBLE COUPLING AND THE METHOD REALIZED BY IT |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3695633A (en) * | 1970-03-19 | 1972-10-03 | Vetco Offshore Ind Inc | Remotely controlled hydraulically operated connectible and disconnectible flexible joint |
US4153112A (en) * | 1977-07-01 | 1979-05-08 | Cameron Iron Works, Inc. | Flex joint |
US4180285A (en) * | 1978-05-11 | 1979-12-25 | Reneau Bobby J | Articulated ball connector for use with pipeline |
-
2003
- 2003-02-03 DE DE60316923T patent/DE60316923D1/en not_active Expired - Lifetime
- 2003-02-03 ES ES03701952T patent/ES2297124T3/en not_active Expired - Lifetime
- 2003-02-03 PT PT03701952T patent/PT1485571E/en unknown
- 2003-02-03 WO PCT/NO2003/000031 patent/WO2003064809A1/en active IP Right Grant
- 2003-02-03 AT AT03701952T patent/ATE376118T1/en not_active IP Right Cessation
- 2003-02-03 DK DK03701952T patent/DK1485571T3/en active
- 2003-02-03 EP EP03701952A patent/EP1485571B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03064809A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE376118T1 (en) | 2007-11-15 |
EP1485571B1 (en) | 2007-10-17 |
DE60316923D1 (en) | 2007-11-29 |
DK1485571T3 (en) | 2008-02-25 |
PT1485571E (en) | 2008-01-24 |
WO2003064809A1 (en) | 2003-08-07 |
ES2297124T3 (en) | 2008-05-01 |
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