EP3219905A1 - Steigerloses eingriffssystem - Google Patents

Steigerloses eingriffssystem Download PDF

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Publication number
EP3219905A1
EP3219905A1 EP16160232.1A EP16160232A EP3219905A1 EP 3219905 A1 EP3219905 A1 EP 3219905A1 EP 16160232 A EP16160232 A EP 16160232A EP 3219905 A1 EP3219905 A1 EP 3219905A1
Authority
EP
European Patent Office
Prior art keywords
lubricator
pipe
lubricator pipe
intervention system
vessel
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.)
Withdrawn
Application number
EP16160232.1A
Other languages
English (en)
French (fr)
Inventor
Kim Johnsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welltec AS
Original Assignee
Welltec 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 Welltec AS filed Critical Welltec AS
Priority to EP16160232.1A priority Critical patent/EP3219905A1/de
Priority to US16/082,390 priority patent/US10801295B2/en
Priority to PCT/EP2017/055845 priority patent/WO2017157854A1/en
Priority to EP17709458.8A priority patent/EP3430232B1/de
Priority to DK17709458.8T priority patent/DK3430232T3/da
Publication of EP3219905A1 publication Critical patent/EP3219905A1/de
Withdrawn legal-status Critical Current

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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
    • E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
    • E21B33/076—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells specially adapted for underwater installations

Definitions

  • the present invention relates to a riserless intervention system for offshore intervention of a well from a vessel by means of a tool string, the vessel having a waterline and the well having a top. Furthermore, the present invention relates to a riserless intervention method for offshore intervention of a well from a vessel by means of a riserless intervention system according to the present invention.
  • a riser When performing a subsea intervention of a well where a tool string is submerged into the well to perform an operation, a riser is often installed at the top of the well from a vessel, and the tool string is subsequently assembled and submerged into the riser.
  • setting up a riser takes approximately 90 days, and a vessel with sufficient capacity is rarely available with a few days' notice, and the operation thus requires more time for planning. Therefore, a riserless solution has been developed where a lubricator pipe is installed above a blowout preventer on the well head or Christmas tree. The tool string is then mounted on the vessel using a grease head and submerged into the water where it enters the lubricator pipe.
  • the grease head is mounted on top of the lubricator pipe and encloses the tool in the lubricator pipe. Then, a flushing system surrounding the lubricator pipe exchanges the seawater in the lubricator pipe with glycol or ethylene glycol, and the lubricator pipe is subsequently pressurised and valves in the top of the well are opened and the intervention operation can occur.
  • a riserless intervention system for offshore intervention of a well from a vessel by means of a tool string, the vessel having a waterline and the well having a top, comprising
  • the closing part may be a burst or rupture disc-shaped part.
  • the closing part may be comprised in a closing unit having an actuator configured to bring the closing part from at least a closed position to an open position.
  • the closing part may have at least two sections.
  • the riserless intervention system as described above may further comprise a grease head configured to be connected with the first end of the lubricator pipe, the grease head being arranged for closing fluid communication through the first opening of the first end of the lubricator pipe.
  • the lubricator pipe may comprise at least a first lubricator part and a second lubricator part.
  • pipe sections may be connected by means of unions or flanges bolted together by bolts or similar fastening means.
  • the second lubricator part may be arranged closest to the grease head, the first lubricator part having an inner diameter which is larger than an inner diameter of the second lubricator part.
  • the inner diameter of the first lubricator part may be larger than an outer diameter of a crown plug.
  • the lubricator pipe may have an inlet.
  • the riserless intervention system as described above may further comprise a remotely operated vehicle (ROV).
  • ROV remotely operated vehicle
  • the ROV may comprise a pump.
  • the ROV may comprise a motor drive pump.
  • the ROV may comprise a pressure intensifier.
  • the ROV may comprise a coupling configured to fluidly connect the pump to an inlet of the lubricator pipe to pressurise the lubricator pipe.
  • the ROV may comprise a glycol reservoir (not shown).
  • a manual pump may be fluidly connected to the lubrication pipe.
  • Said manual pump may be configured to be operated by the ROV.
  • pressure means may be arranged to pressurise a pressure inside the lubricator pipe.
  • the tool string may comprise first and second parts.
  • the lubricator pipe may comprise a pressure equalising valve device for equalising the pressure inside the lubricator pipe with a liquid surrounding the lubricator pipe during descent of the lubricator pipe below the waterline.
  • the lubricator pipe may have a hydraulic accumulator.
  • the pressure equalising valve device may be configured to allow liquid to enter the lubricator pipe during descent and to allow liquid inside the lubricator pipe to leave the lubricator pipe during ascent.
  • the riserless intervention system as described above may further comprise a de-icing system.
  • the riserless intervention system as described above may further comprise a vessel, the vessel having a vessel height above the waterline which is smaller than a length of the tool string.
  • the riserless intervention system as described above may further comprise a blow-out preventer, a Christmas tree and/or a well head.
  • the lubricator pipe may further comprise a tool catcher configured to maintain the tool string at a predetermined position in the lubricator pipe.
  • a manual pump may be fluidly connected to the lubricator pipe.
  • system may comprise a plurality of lubricator pipes.
  • system may comprise a plurality of tool strings.
  • the vessel may comprise a suspension unit.
  • the vessel may comprise a dynamic positioning system.
  • the vessel may comprise a supply of anti-freeze liquid such as glycol.
  • the present invention also relates to a riserless intervention method for offshore intervention of a well from a vessel by means of a riserless intervention system as described above, the vessel having a waterline and the well having a top, the method comprising the steps of:
  • Fig. 1 shows a riserless intervention system 100 for offshore intervention of a well 1 from a vessel 2 by means of a tool string 3 (shown in Fig. 2 ).
  • the riserless intervention system 100 comprises a lubricator pipe 20 comprising a first end 18 and a second end 19. The second end is configured to connect with a top 10 of the well.
  • the first end has a first opening 15 for letting the tool string 3 into the lubricator pipe and the second end has a second opening 16 for letting the tool string in and out of the well.
  • the riserless intervention system 100 further comprises a closing part 33 arranged at the second end for closing fluid communication through the second opening of the second end of the lubricator pipe.
  • FIG. 2 thus shows a well 1 which is about to be intervened from a vessel 2 by an intervention tool in the form of a tool string 3 comprising at least a first part 6 and a second part 8. While assembling, the tool string 3 is part by part lowered down into a lubricator pipe 20 which is then mounted on e.g. a blowout preventer 40 or directly on a Christmas tree 50 forming the top 10 of the well 1.
  • the second opening 16 can be closed when submerging the lubricator pipe 20 to connect with the top of the well, and thus the lubricator pipe 20 can be filled with glycol by means of equipment on board the vessel 2, which eliminates the need to have expensive subsea flushing equipment.
  • Subsea flushing equipment is more expensive than conventional pumps at the deck, since the subsea flushing equipment must be able to withstand both a pressure which is a hundred times higher than the pressure at surface, and also very low temperatures. At the deck such equipment can easily be heated if necessary.
  • the vessel makes it is much easier to detect when the lubricator is filled with a sufficient amount of ethylene glycol as the glycol is merely poured into the lubricator pipe, and thus the equipment does not need to have detection means for detecting when the sea water in the lubricator is fully exchanged with glycol.
  • the lubricator pipe 20 is mounted from the vessel 2 having a mounting height H smaller than a length L (shown in Fig. 3 ) of the lubricator pipe 20.
  • the mounting height extends from the deck of a waterline 4 of the vessel 2 to the summit of the highest possible reach of the lubricator pipe in the upward direction.
  • the lubricator pipe 20 is mounted by submerging the closing unit 33a partly below the waterline 4, and a first end 21 of a first lubricator part 22 of the lubricator pipe 20 is then connected to the closing unit 33a above the waterline.
  • the vessel 2 may have a moon pool 41 into which the lubricator parts are lowered, or the lubricator pipe may be lowered over the side of the vessel (not shown). Then the first end 21 of a first lubricator part 22 of the lubricator pipe 20 is submerged below the waterline 4 so that a second end 23 of the first lubricator part is above the waterline. Subsequently, a second lubricator part 24 is arranged on top of the first lubricator part 22 and a first end 25 of the second lubricator part is connected to the second end 23 of the first lubricator part.
  • the tool string 3 is mounted from the vessel 2 by submerging a first end 5 of a first part 6 of the tool string 3 below the waterline 4 so that a second end 7 of the first part extends above the waterline and is suspended in a suspension unit 31. Then, the second part 8 of the tool string 3 is arranged on top of the first part 6 of the tool string by a second suspension unit 31b, and a first end 9 of the second part 8 of the tool string is connected with the second end 7 of the first part of the tool string above the waterline 4 while the remaining part of the first part is below the waterline.
  • the mounting height of the vessel 2 can be substantially reduced, which eliminates the a need for a large vessel, which in turn substantially reduces costs related to renting a vessel and further reduces the time needed for planning and performing the operation.
  • the length of the tool string 3 is no longer restricted by the mounting height available on the vessel 2, and the tool string can now in theory be mounted with an endless length.
  • the lubricator When also the tool string is assembled and arranged in the lubricator pipe 20, the lubricator is filled with glycol, and a grease head 30, as shown in Fig. 3 , is connected to the first end 18 of the lubricator pipe 20 for closing a first opening 15 of the first end 18. Finally, the lubricator pipe 20 comprising the tool string 3 is submerged into the sea and is connected to the top 10 of the well 1 as shown in Fig. 4 .
  • the second end 28 of the second lubricator part 24 is partly submerged into the water, and a first end 26 of a third lubricator part 27 of the lubricator pipe is mounted to a second end 28 of the second lubricator part 24.
  • further lubricator parts can be mounted on top of the third lubricator part in the same manner by first partly submerging the previously mounted part below the waterline and then connecting the further part thereto until the entire lubricator pipe is assembled.
  • the closing part 33 of the riserless intervention system 100 of Fig. 5 is a burst or rupture disc-shaped part arranged between two flanges as shown in Fig. 6 .
  • the two flanges are bolted together by means of bolts 38 and the closing part 33 is squeezed in between the flanges 37.
  • the closing part has sections 34 as shown in Fig. 7 , and when the tool string is to enter the well as shown in Fig. 4 , the tool string presses itself past the closing part, breaking the sections 34 apart at the separation lines 35.
  • the sections are thus somewhat flexible in order to allow the tool string to pass, but are also to close the second opening again when the tool string re-enters the lubricator pipe 20 and no longer forces the sections radially outwards.
  • the pressure inside the lubricator pipe is substantially the same as the pressure in the sea before disconnecting the lubricator pipe.
  • This equalisation is performed by a pressure equalising valve device 73 (shown in Fig. 5 ) for equalising the pressure inside the lubricator pipe with a liquid surrounding the lubricator pipe during descent and also ascent of the lubricator pipe.
  • the closing part 33 needs only separate the sea water and the liquid inside the lubricator pipe 20 and does not need to be able to carry the load of all the liquid inside the lubricator pipe 20.
  • the closing part 33 is comprised in a closing unit 33a as shown in Fig. 9 having an actuator 42 configured to bring the closing part from at least a closed position to an open position.
  • the closing part In the left side of Fig. 9 , the closing part is shown in its closed position closing the second opening 16, and in the right side of Fig. 9 the closing part is shown in its open position.
  • the closing part 33 has two sections 34 as shown in Figs. 8a and 8b , and the sections 34 are pivotably mounted by a hinge 36. As shown in Fig. 9 , the sections may have an inclined face 75 corresponding to a seat 76 in the closing unit 33a.
  • the hinge 36 is hingedly connected to the body of the closing unit and moved by a piston sleeve 42a of the actuator 42.
  • the piston sleeve 42a moves in an annular space 43 which is pressurised through the connection pipe 39.
  • a spring 46 is compressed as shown in the right side of Fig. 9 .
  • the fluid below the piston sleeve 42a is then forced out of the openings 47.
  • Sealing means are arranged to seal the inside from the surrounding sea water.
  • the hinge engages, in the left side of Fig. 9 , an annular groove of the piston sleeve 42a to bring the closing part to the closed position.
  • the first lubricator part 22 has an inner diameter ID1, shown in Fig. 11 , which is larger than an inner diameter ID2 of the second lubricator part 24.
  • the inner diameter ID1 of the first lubricator part is larger than an outer diameter OD of a crown plug 55.
  • the internal volume of the lubricator pipe 20 is substantially reduced, which results in the amount of glycol used for such plug retrieval intervention being substantially reduced.
  • the inner diameter of the lubricator pipe would correspond to the outer diameter of the crown plug and be the same along the whole lubricator pipe.
  • the lubricator pipe 20 has a connection pipe 56 for letting liquid in and out during descent and ascent.
  • the lubricator pipe 20 comprises a pressure equalising valve device 73 for equalising the pressure inside the lubricator pipe with a liquid surrounding the lubricator pipe during descent of the lubricator pipe below the waterline.
  • the pressure equalising valve device 73 may comprise a relief valve for performing a simple equalisation of the pressure during ascent and descent. The valve is closed during pressurisation of the lubricator pipe before the tool string is to enter the well.
  • the pressurisation may be performed by a remotely operated vehicle (ROV) 57 (shown in Fig. 1 ) operating a manual pump 71 fluidly connected to the lubrication pipe.
  • the lubricator may further comprise a de-icing system 74.
  • the ROV comprises a pump 58, a motor 59 for driving the pump and a pressure intensifier 60.
  • the ROV may further comprise a coupling 61 configured to fluidly connect the pump to connection pipe 56 of the lubricator pipe to pressurise the lubricator pipe.
  • the lubricator pipe does not need to have any pressure means as a conventional ROV is just used.
  • the ROV may further comprise a glycol reservoir (not shown).
  • the tool string 3 After performing an intervention operation by means of the tool string, e.g. pulling a crown plug or milling out a safety valve, the tool string 3 re-enters the lubricator pipe and is fastened in a tool catcher 32 as shown in Fig. 4 . Then, the valves in the top 10 of the well 1, e.g. in the blowout preventer 40, are closed, and the lubricator pipe is disconnected from the top 10 of the well 1. Before the lubricator pipe is disconnected, a closing part 33 is closed, thereby closing the second opening 16 (shown in Fig.
  • the dirty fluid is kept in the lubricator pipe when the tool string is reconstructed or re-rigged, and the grease head 30 is subsequently re-mounted and the lubricator pipe with the tool string is mounted for another operation while the second end 19 of the lubricator pipe remains in the water and the closing part 33 keeps the seawater and the fluid inside the lubricator pipe from mixing.
  • the tool string is disconnected part by part, and subsequently the lubricator pipe is disconnected part by part until all the lubricator parts are above the waterline.
  • the riserless intervention system may comprise a plurality of lubricator pipes, so that when one tool string is performing an operation, the next lubricator pipe and another tool string are mounted to be ready.
  • the riserless intervention system may also have a plurality of tool strings.
  • the vessel may comprise a dynamic positioning system.
  • the tool string or the lubricator pipe is arranged in a suspension unit 31 which may be a gyroscopic suspension unit, causing movements of the vessel 2 to be absorbed by the suspension unit.
  • the vessel may also comprise a supply of anti-freeze liquid such as glycol.
  • the tool string may comprise several parts and operational tools arranged in the end facing the well.
  • the parts of the tool string may be a stroker tool for pulling a crown plug, a key tool for moving a sliding sleeve, a milling tool for milling out a safety valve etc.
  • a stroking tool is a tool providing an axial force.
  • the stroking tool comprises an electrical motor for driving a pump.
  • the pump pumps fluid into a piston housing to move a piston acting therein.
  • the piston is arranged on the stroker shaft.
  • the pump may pump fluid into the piston housing on one side and simultaneously suck fluid out on the other side of the piston.
  • fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
  • gas is meant any kind of gas composition present in a well, completion, or open hole
  • oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
  • Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
  • a downhole tractor can be used to push the tool all the way into position in the well.
  • the downhole tractor may have projectable arms having wheels, wherein the wheels contact the inner surface of the casing for propelling the tractor and the tool forward in the casing.
  • a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
  • a casing any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP16160232.1A 2016-03-14 2016-03-14 Steigerloses eingriffssystem Withdrawn EP3219905A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP16160232.1A EP3219905A1 (de) 2016-03-14 2016-03-14 Steigerloses eingriffssystem
US16/082,390 US10801295B2 (en) 2016-03-14 2017-03-13 Riserless intervention system and method
PCT/EP2017/055845 WO2017157854A1 (en) 2016-03-14 2017-03-13 A riserless intervention system and method
EP17709458.8A EP3430232B1 (de) 2016-03-14 2017-03-13 Steigerloses eingriffssystem
DK17709458.8T DK3430232T3 (da) 2016-03-14 2017-03-13 Stigrørsløst interventionssystem og fremgangsmåde

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16160232.1A EP3219905A1 (de) 2016-03-14 2016-03-14 Steigerloses eingriffssystem

Publications (1)

Publication Number Publication Date
EP3219905A1 true EP3219905A1 (de) 2017-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16160232.1A Withdrawn EP3219905A1 (de) 2016-03-14 2016-03-14 Steigerloses eingriffssystem

Country Status (1)

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EP (1) EP3219905A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11486218B1 (en) * 2021-10-14 2022-11-01 Saudi Arabian Oil Company Split riser lubricator to reduce lifting heights during tool installation and retrieval

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070175639A1 (en) * 2004-03-22 2007-08-02 Vetco Aibel As Method and a device for monitoring an/or controlling a load on a tensioned elongated element
US20080264643A1 (en) * 2007-04-24 2008-10-30 Brian Skeels Lightweight device for remote subsea wireline intervention
WO2016028412A1 (en) * 2014-08-19 2016-02-25 Aarbakke Innovation A.S. Battery operated autonomous scale removal system for wells

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070175639A1 (en) * 2004-03-22 2007-08-02 Vetco Aibel As Method and a device for monitoring an/or controlling a load on a tensioned elongated element
US20080264643A1 (en) * 2007-04-24 2008-10-30 Brian Skeels Lightweight device for remote subsea wireline intervention
WO2016028412A1 (en) * 2014-08-19 2016-02-25 Aarbakke Innovation A.S. Battery operated autonomous scale removal system for wells

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11486218B1 (en) * 2021-10-14 2022-11-01 Saudi Arabian Oil Company Split riser lubricator to reduce lifting heights during tool installation and retrieval

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