WO2009157776A1 - Procédé pour ancrer une ligne d’amarrage - Google Patents

Procédé pour ancrer une ligne d’amarrage Download PDF

Info

Publication number
WO2009157776A1
WO2009157776A1 PCT/NO2009/000232 NO2009000232W WO2009157776A1 WO 2009157776 A1 WO2009157776 A1 WO 2009157776A1 NO 2009000232 W NO2009000232 W NO 2009000232W WO 2009157776 A1 WO2009157776 A1 WO 2009157776A1
Authority
WO
WIPO (PCT)
Prior art keywords
rig
bolt
drilling
mooring
drill
Prior art date
Application number
PCT/NO2009/000232
Other languages
English (en)
Inventor
Ove Berg
Roald Solbakken
Henrik A. Magnus
Original Assignee
Fensfjord Mooring 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 Fensfjord Mooring As filed Critical Fensfjord Mooring As
Publication of WO2009157776A1 publication Critical patent/WO2009157776A1/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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • E21B7/124—Underwater drilling with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • 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
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/12—Underwater drilling
    • E21B7/122—Underwater drilling with submersible vertically movable guide

Definitions

  • the present invention relates to a method for anchoring of a mooring line to an underwater anchorage point, as described in the introduction of the independent claim 1.
  • the drilling rig according to the invention is intended to be used to drill holes in rock under water down to, for example, depths of about 200 meters, or deeper if necessary.
  • the rig is particularly intended for drilling of under water anchorage points with lowering and securing of mooring bolts and a connected mooring line from the same rig.
  • the rig is lowered to the bottom and lifted up and also supplied with energy and control via a lifting and control cable from a mother vessel.
  • the rig can be driven by water under pressure via a control cable (water hydraulics) for the drilling equipment itself, and also electrical power for operation of hydraulic servo valves and also lights and cameras.
  • a control cable water hydraulics
  • GB 2436320 A shows an anchorage system with drilling equipment mounted onto a frame to drive a drill down into the ground.
  • the drilling equipment is fastened to the legs of the frame so that the drill is driven through the leg and the associated foot.
  • the drill has internal channels for the securing fluid which is used for cementing of the hole.
  • the drill When the drill is fastened, it functions as a fastening bolt for the feet of the frame, so that the frame is fixed to the ocean bed.
  • a fastening bolt is thereafter driven down, clear of the legs, and the drilling equipment can be driven up again whereupon the whole drilling rig can be hoisted to the surface. If the frame according to GB 2436320 A shall be hoisted up, the bolt must be cut before this can be performed.
  • US 4,215,544 Al shall be mentioned.
  • This shows a drilling rig that drills a hole in the ocean bottom with the help of a drill, whereupon the tools on the rig are thereafter rotated and a mooring pole is set down into the drilled hole.
  • a dedicated drill is used for the drilling operation.
  • the equipment shown is driven by water hydraulics and shows somewhat extensive and cumbersome equipment as the operation must be carried out in many steps. With the present solution one simple operation is performed as the mooring bolt and the drill is made up of the same unit.
  • US 3,741,320 Al shows a drilling rig with hydraulic, adjustable legs, the level of which can be regulated with the help of a gyroscope.
  • this drilling rig is intended for core drilling in examination of the ocean bed.
  • WO 2007/108698 Al shows also a drilling rig which is placed on the ocean bottom and which is equipped with different tools that can be moved between the drilling centre and the storage locations.
  • the method for anchoring of a mooring line to an underwater anchorage comprises the steps: at the surface, to fasten a carrier cable to a drilling rig, to lower the drilling rig down to the ocean bottom with the help of the carrier cable, with the rig having a mooring bolt fastened to the drilling equipment on the rig, and to regulate the level of the rig on the ocean bottom so that is standing approximately level.
  • the method is characterised in that before the drilling rig is submersed, the mooring line is fastened to a fastening eye on the bolt such that the line is secured and goes with the rig down to the ocean bottom, and to drill the mooring bolt down into the rock formation of the ocean bed, to force securing fluid through one or more channels in the bolt up between the bolt and the drilled hole for fastening of the bolt, and that after the securing process is completed, to release the bolt from the drilling equipment on the rig, whereupon the rig is hoisted up to the surface while the mooring bolt with the mooring line is left behind anchored to the ocean bed.
  • Alternative embodiments are given in the dependent claims 2 to 9.
  • the mooring bolt is preferably equipped with a drilling crown which is left behind in the bottom of the drill hole.
  • the drilling rig can be equipped with a drilling tower with a drill hammer fastened to a slide, in which the drill hammer with the mooring bolt is displaced down towards the rock foundation to offer support during the drilling and which is driven by water which is supplied under pressure.
  • water can be flushed through one or more of the channels in the bolt, whereupon a predetermined amount of securing fluid can be forced into the bore hole and up along the bolt.
  • the equipment on the drilling rig can be controlled with the help of a valve block which is controlled from the surface .
  • a hydraulically operated locking device is mounted on the drill hammer, comprising a fastening slide with locking fork which is driven hydraulically and which holds the bolt in position during the lowering of the rig and also during the drilling process itself.
  • Sludge and contaminating material that cover the rock where the drilling is to be carried out can be sucked away with the help of a pump in a suction system on the rig.
  • the rig can be controlled by one or more mounted propellers to pull the rig in a particular direction or to rotate the rig .
  • Figure 1 shows a drilling rig according to the invention without the legs being shown and viewed from the side.
  • Figure 2 shows the drilling rig seen from above.
  • Figure 3 shows a drawing of a mooring bolt for use in the drilling rig.
  • Figure 4 shows a section of the mooring bolt.
  • the drilling rig 10 comprises a base 12 to which the necessary equipment to carry out the operation is arranged.
  • a lifting beam or yoke 14 is arranged on the base 12, from which a carrier cable 16 runs up to the surface.
  • the carrier cable l ⁇ is used in the lowering of the drilling rig 10.
  • Necessary supply cables 18 for electrical power and water to drive the drilling rig 10 also run down from the surface.
  • a mother ship from which the drilling rig is lowered will normally be on the surface.
  • the drilling rig 10 is further equipped with a drilling tower 32 with a drill hammer 20 that is driven by water.
  • the drill hammer 20 is fastened to a glide rail 22.
  • the three support legs 2 ⁇ a, 2 ⁇ b, 2 ⁇ c are fastened to the base plate 12 with hinged brackets 30a, 30b, 30c.
  • a hydraulic cylinder (not shown) can regulate each leg via servo valves from a control system.
  • the legs can have a hinged plate 28a, 28b, 28c furthest out to make the best possible contact with any inclining rock formation.
  • the set up (levelling) of the base plate 12 can be carried out via the three support legs 26a, 2 ⁇ b, 2 ⁇ c and can be assisted by a special gyro unit.
  • feed hoses for the hydraulics to the support leg cylinders run from a valve block.
  • the lifting beam 14 is centrally fastened to the base plate 12 at the point of gravity for the rig and the lifting beam caries the weight of the rig during the lowering and hoisting.
  • a fastening system for the carrier cable 16 is mounted on the lifting beam 14. This cable runs from a winch on the mother vessel which ensures the lowering and hoisting of the rig 10. With the carrier cable 16 follows the supply cable 18 combined with a line for hydraulic energy, electrical energy and also the control cable. The carrier cable 16 and the supply cable 18 can be combined into one joint construction.
  • the drilling tower 32 can be fastened to the base plate 12 with hinged brackets 34 so that it can be collapsed during transportation. This collapsing is normally carried out manually.
  • the tower 32 is, as mentioned, equipped with glide rails 22, where a wagon that carries the drill hammer 20 can glide up and down on these glide rails.
  • a hydraulic cylinder (not shown) is fastened to the tower 32 at the one end, the other end being fastened to the wagon. This makes possible the vertical movement of the drill hammer 20 and also feed pressure for the drill hammer during the drilling operations.
  • the feeding tube for hydraulics to the feed cylinder comes from a valve block.
  • the drill hammer 20 which is intended to be used can be a ready made unit which is on sale at the mill market. This is a tried and tested unit which is driven by water under a high pressure. This hammer is developed for demanding operations in very corrosive mining environments and can withstand much pollution in the water that drives the hammer. The hammer 20 provides both blows and rotation in the same unit. However, it shall be pointed out that other drill hammers can also be used.
  • the mooring bolt 40 is a separate unit, which is inserted in the drill hammer 20.
  • the bore crown 42 itself which remains back in the bottom of the hole and is fixed with the bolt, is placed at the front of the bolt 40.
  • the bolt 40 has a fastening eye 44 mounted, in which the mooring line 46 is already secured so that it is brought along down from the surface.
  • the bolt 40 is secured directly in the bolt hammer 20 and is drilled down until it is level with the rock foundation.
  • the bolt has a device called an adapter 48 which ensures that securing fluid or glue can be forced down through a central channel 50 through the bolt 40 and up between the bolt and the rock and, in this way, glue the mooring bolt 40 to the rock.
  • the bolt 40 is released from the drill hammer 20 and the securing system.
  • the drill hammer 20 is pulled back up onto the drill tower 32 and the process is completed.
  • Mounted one-way valves prevent the securing fluid from being forced up into the drill hammer.
  • a hydraulically operated locking device can also be mounted on the drill hammer. This comprises a fastening slide with a locking fork which is hydraulically operated and which has as a task to hold the bolt in its position during the lowering of the rig and also during the drilling process itself.
  • a system for forcing in securing liquid (glue) is placed on the base plate.
  • This system comprises a container with securing liquid, a system for pressurising this and also a connection to the adapter 48 which ensures the connection to the channel 50 through the fastening bolt 40 to lead the securing liquid out between the bolt and the rock.
  • the drilled hole is properly flushed with water before the securing (gluing) .
  • the flushing is stopped and a valve for the securing fluid under pressure is opened.
  • a predetermined amount of securing fluid is forced down into the drill hole and up along the outside of the bolt 40 itself.
  • the securing fluid can also be forced down from the surface.
  • the valve box 24 encompasses the valve block that controls the different functions of the rig.
  • the box is constructed to protect the electrical components on the servo valve themselves, and also the part of the electrical control which is placed on the rig.
  • the box can be dry or filled with oil. Sensors connected to the box warn about damaging ingress of water.
  • the rig can be controlled from the surface with a PLC- based control system. This communicates with the control unit on the rig via a bus connection. In addition to controlling the different functions on the rig, the control system also contains monitor (s) to follow the work progress via a camera on the rig.
  • a number of underwater cameras for example two to three, can be mounted on an extendable beam to monitor the working operations.
  • the connection can be via a cable up to the control unit on the surface.
  • the camera positions can have mounted lights as the light conditions can be poor due to depth, season and time of day.
  • the rig can be equipped with a suction system which, via a pump, can suck away sludge and contaminating matter that cover the rock foundation which shall be drilled.
  • the rig can also be equipped with a propeller to pull the rig in a particular direction or rotate the rig.
  • This propeller can be driven hydraulically and can be turned hydraulically to change direction of the force.
  • the rig Before a new operation the rig is hoisted up onto the mother vessel for cleaning of the bolt adapter, fitting of a new mooring bolt/line and moving to a new position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un procédé destiné à ancrer une ligne (46) d’amarrage à un ancrage subaquatique, comportant les étapes consistant : à la surface, à fixer un câble porteur (16) à un appareil (10) de forage, à faire descendre l’appareil (10) de forage jusqu’au fond de l’océan à l’aide du câble porteur (16), l’appareil (10) étant doté d’un boulon (40) d’amarrage fixé à l’équipement de forage présent sur l’appareil (10), et à réguler le niveau de l’appareil (10) sur le fond de l’océan de telle sorte qu’il soit approximativement horizontal. Avant de faire descendre l’appareil (10) de forage, la ligne (46) d’amarrage est accrochée à un œillet (44) de fixation sur le boulon (40), de telle sorte que la ligne (46) soit accrochée et entraînée vers le bas depuis la surface, et à enfoncer le boulon (40) d’amarrage dans la fondation rocheuse au fond de l’océan. Du fluide d’ancrage est ensuite envoyé vers le bas à travers un ou plusieurs conduits (50) dans le boulon (40) et vers le haut entre le boulon et le trou percé afin d’immobiliser le boulon (40) ; une fois le processus d’ancrage achevé, le boulon (40) est libéré de l’équipement de forage présent sur l’appareil (10) et l’appareil est alors hissé jusqu’à la surface, tandis que le boulon (40) d’amarrage solidaire de la ligne (46) d’amarrage est laissé ancré au fond de l’océan.
PCT/NO2009/000232 2008-06-23 2009-06-23 Procédé pour ancrer une ligne d’amarrage WO2009157776A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20082840A NO330317B1 (no) 2008-06-23 2008-06-23 Fremgangsmate for forankring av en fortoyningsline til et undervannsfeste
NO20082840 2008-06-23

Publications (1)

Publication Number Publication Date
WO2009157776A1 true WO2009157776A1 (fr) 2009-12-30

Family

ID=41444711

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2009/000232 WO2009157776A1 (fr) 2008-06-23 2009-06-23 Procédé pour ancrer une ligne d’amarrage

Country Status (2)

Country Link
NO (1) NO330317B1 (fr)
WO (1) WO2009157776A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103015897A (zh) * 2011-08-23 2013-04-03 包尔机械有限公司 用于钻孔的水下钻探装置和方法
NO20161873A1 (no) * 2016-11-25 2017-02-03 Optiship As Etablering av fjellboltar med borrerigg og ROV
AU2017248492B1 (en) * 2016-12-29 2018-07-05 Japan Landcare Technologies Co., Ltd. Lifting structure, work boat, and method for installing pivot anchor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2891770A (en) * 1955-01-13 1959-06-23 Shell Oil Co Anchoring method and apparatus
US3118417A (en) * 1962-07-30 1964-01-21 Stanwick Tad Method and apparatus for anchor embedment
US3603408A (en) * 1968-10-07 1971-09-07 August Hendrik Maria Smulders Submarine drilling apparatus
US3604519A (en) * 1969-02-14 1971-09-14 Stephen V Chelminski Method of creating underwater thrusts to drive a member into the earth
GB2436320A (en) * 2006-03-13 2007-09-26 John Richard Carew Armstrong Deep water remote drilled anchoring system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215544A (en) * 1978-05-17 1980-08-05 Tad Stanwick Method of generating rotary power in a deepsea environment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2891770A (en) * 1955-01-13 1959-06-23 Shell Oil Co Anchoring method and apparatus
US3118417A (en) * 1962-07-30 1964-01-21 Stanwick Tad Method and apparatus for anchor embedment
US3603408A (en) * 1968-10-07 1971-09-07 August Hendrik Maria Smulders Submarine drilling apparatus
US3604519A (en) * 1969-02-14 1971-09-14 Stephen V Chelminski Method of creating underwater thrusts to drive a member into the earth
GB2436320A (en) * 2006-03-13 2007-09-26 John Richard Carew Armstrong Deep water remote drilled anchoring system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103015897A (zh) * 2011-08-23 2013-04-03 包尔机械有限公司 用于钻孔的水下钻探装置和方法
NO20161873A1 (no) * 2016-11-25 2017-02-03 Optiship As Etablering av fjellboltar med borrerigg og ROV
AU2017248492B1 (en) * 2016-12-29 2018-07-05 Japan Landcare Technologies Co., Ltd. Lifting structure, work boat, and method for installing pivot anchor

Also Published As

Publication number Publication date
NO20082840L (no) 2009-12-28
NO330317B1 (no) 2011-03-28

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