EP3155207A1 - Ensemble tour de forage et son procédé d'utilisation - Google Patents

Ensemble tour de forage et son procédé d'utilisation

Info

Publication number
EP3155207A1
EP3155207A1 EP15807466.6A EP15807466A EP3155207A1 EP 3155207 A1 EP3155207 A1 EP 3155207A1 EP 15807466 A EP15807466 A EP 15807466A EP 3155207 A1 EP3155207 A1 EP 3155207A1
Authority
EP
European Patent Office
Prior art keywords
casing
deck
derrick
gripping
derrick assembly
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Withdrawn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
EP15807466.6A
Other languages
German (de)
English (en)
Other versions
EP3155207A4 (fr
Inventor
John Reidar KALLESTEN
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.)
Joreka Management As
Original Assignee
Joreka Management 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 Joreka Management As filed Critical Joreka Management As
Publication of EP3155207A1 publication Critical patent/EP3155207A1/fr
Publication of EP3155207A4 publication Critical patent/EP3155207A4/fr
Withdrawn legal-status Critical Current

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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • 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
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • 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
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E21B15/02—Supports for the drilling machine, e.g. derricks or masts 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • E21B19/06—Elevators, i.e. rod- or tube-gripping devices
    • 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
    • E21B33/04—Casing heads; Suspending casings or tubings in well heads

Definitions

  • the invention relates to a derrick assembly, the derrick assembly comprising a derrick and a gripping deck including a holding device for holding a casing . Further, the invention relates to a method of loosening a casing and pulling it out of a well with the use of said derrick assembly.
  • a drill string is run down with a tool suitable to be attached inside the casing. Then the drill string is raised, and thereby the casing, by means of a hoisting device.
  • a hoisting device comprising drawworks and a block system to pull the casing .
  • the challenge of this may be to provide sufficient power to loosen the casing with the use of a modular rig on old platforms. In some cases it will be necessary to replace the hoisting device on board the platform, rather than spending a good deal of money on upgrading an old rig.
  • the challenge will thus be to have enough power available while, at the same time, the derrick is not too heavy for the rest of the platform structure.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
  • the invention relates more specifically to a derrick assembly, the derrick assembly including a derrick and a gripping deck which includes a holding device for holding a casing, characterized by the derrick assembly including a lifting device arranged to lift the gripping deck together with the casing.
  • the gripping deck may be part of the drilling floor, and the holding device may include a known rotary table, but the invention is not limited thereto.
  • derrick indicates a derrick or mast.
  • the lifting device indicates a device suitable for raising or lowering the gripping deck.
  • the lifting device will be specified further in what follows.
  • the effect of the lifting device being arranged to lift the gripping deck is that the casing that is held in the gripping deck via the holding device will be lifted at the same time.
  • the lifting device lifting the gripping deck may be arranged to have a high lifting capacity, for example in the order of 600-800 tonnes, which makes it suitable for loosening casings fixed by cementation.
  • Such a lifting device will bring a reduction in the need for lifting power from the lifting system at the top of the derrick or from the top drive and, consequently, both weight and costs connected with the derrick structure may be reduced considerably as well.
  • the derrick assembly as it is described above, can also be used to pull loose or lift any elements other than casing, wherever practical.
  • the derrick may be placed on the gripping deck and, thus, the derrick, too, will be lifted together with the gripping deck and the casing.
  • the advantage of this is the simplicity of the system by the fact that, as it is being raised, the gripping deck will not come up inside the derrick and thus take up space. The different elements of the derrick assembly thus will not come into conflict with each other, and they take up less space.
  • the derrick assembly may include a hoisting device positioned in an upper portion of the derrick.
  • the hoisting device and the lifting device may work in alternation, that is to say work together, or work independently of each other.
  • the hoisting device will typically have a lower lifting capacity than the lifting device, and where the lifting device is engaged when great power is needed, the hoisting device may be used for lighter tasks, such as lifting or pulling casings or other elements, which have already been loosened, out of the well. Further, the hoisting device is usually used to raise and lower the drill string and for other tasks that are known from the state of the art and therefore not described in any further detail in what follows.
  • This combination of lifting systems is particularly practical because it allows the hoisting device to be relatively light, as it is supported by the lifting device which has a very high lifting capacity.
  • the lifting device may thus be used for the heavy work of tearing loose a casing and raising it, before the hoisting device takes over and does the relatively lighter work of moving the casing when it is loose.
  • moving is primarily meant, in this connection, to pull the casing further upwards and out of the well, which must not be mixed up with lifting the casing aside after it has been pulled out of the well, as is known from the state of the art.
  • the lifting device and the hoisting device may be arranged to work in alternation then, as both the lifting device and the hoisting device are arranged to pull casing out of a well.
  • Pulling casing with the lifting device is a slow process in relation to the pulling with the hoisting device.
  • the combination of the two lifting systems makes it possible, on the one hand, to have a system which is powerful enough and, on the other hand, to have a system which is also efficient and light.
  • the lifting device may be connected to the gripping deck.
  • a hoisting mechanism placed in the derrick which carries with it the fact that the derrick structure itself will have to be heavy to be able to withstand the forces that are active.
  • the fact that the lifting device according to the invention is connected to the gripping deck makes it possible for the structure of the lifting device to be smaller and lighter, but still have at least as high a lifting capacity as prior-art hoisting mechanisms.
  • the lifting device may be positioned under the gripping deck.
  • the lifting device may include at least one jack.
  • jack indicates a raising and lowering device which is placed in a lower part of the derrick assembly, and which is arranged to be able to lift the gripping deck.
  • the term “jack” is to be interpreted in a wide sense, and may include various hoisting devices and lifting mechanisms which will be further elaborated on in what follows.
  • the lifting device comprises at least one jack constitutes one possible embodiment of the lifting device.
  • the at least one jack may comprise four jacks. What is the most appropriate number of jacks will depend on the design and extent of the gripping deck that the jacks are going to lift. In one embodiment it will be possible to imagine the gripping deck as a mostly square deck, wherein the jacks are placed in the respective corners of the gripping deck, for example.
  • the at least one jack may be fluid-operated or electrically operated, or it may include rack gearing.
  • the at least one jack may be fluid-operated or electrically operated, or it may include rack gearing.
  • the at least one jack may be a screw jack.
  • the lifting device may comprise a wire system, which may be operated by electrical winches, for example.
  • the wire system constitutes a possible embodiment of the lifting device.
  • the hoisting device may comprise a pulley system.
  • a pulley system is meant, here, a conventional lifting system lifting from the top of the derrick, the pulley system comprising components like snatch blocks, winches and associated drawworks.
  • the holding device may include a rotary table.
  • the advantage of the holding device including a rotary table is that, basically, the rotary table is already holding the drill string with the casing.
  • the rotary table together with the part of the drill string that connects the casing to the gripping deck will thus constitute the holding device of the derrick assembly for holding the casing. Not having to provide a further holding device is an advantage.
  • the invention relates more specifically to a method of loosening and pulling a casing with a derrick assembly according to the first aspect of the invention, the method including the steps:
  • the method may further include placing the derrick on the gripping deck in order thus to be able to lift the derrick together with the casing .
  • the method may further include the steps:
  • the powerful lifting device will do the first job of loosening the casing from the well wall, and, after that, the hoisting device, which is less powerful, but faster, will take over and pull the pipe further out when it has been loosened.
  • the method may further include repeating the following steps:
  • the above-mentioned method thus specifies alternating use of the lifting device and the hoisting device which is very useful where there is a varying need for great power and great speed, respectively.
  • this alternating action may be used in other operations in which, for example, a tool has got stuck in a well. It must then be understood that it may be other elements, for example the drill string, that are alternatingly attached to the gripping deck and to the hoisting device, for loosening and subsequent pulling.
  • the invention comprises an oil rig which includes a derrick assembly, the oil rig including an underbody and a deck, and the derrick assembly being placed on the deck.
  • Figure 1 shows a principle drawing of a derrick assembly
  • Figure 2 shows a principle drawing of a derrick assembly as a drill string is being run into a well
  • Figure 3 shows a principle drawing of a derrick assembly after the casing has been severed and is ready to be pulled out
  • Figures 4-8 shows principle drawings of a derrick assembly in various stages of pulling the casing.
  • Figure 1 shows a derrick assembly 1, the derrick assembly 1 comprising a derrick 11, a lifting device 12, a gripping deck 13 and a hoisting device 14.
  • the derrick assembly 1 is placed in a centred manner over a blowout preventer (BOP) 3 and connected to this via a telescopic pipe 4.
  • BOP blowout preventer
  • the blowout preventer 3 is further connected to a high- pressure riser 5 extending down to a wellhead 6.
  • the wellhead 6 forms an attachment for a casing 2 and a so-called conductor casing 7, which is an outer casing extending a distance down the well.
  • the casing 2 extends from the wellhead 6, inside the conductor casing 7, through a wellhead deck 61 and further down into a well (not shown).
  • the lifting device 12 is shown, in this exemplary embodiment, as jacks or screws placed under the gripping deck 13.
  • the hoisting device 14 is shown as a pulley system 14 including a crown block 141, a wire 142, a travelling block 143, an elevator 144 and drawworks (not shown).
  • the gripping deck 13 includes a holding device 131, which, in this exemplary embodiment, includes a rotary table 1311 and slips 1312.
  • Figure 2 shows the derrick assembly 1 as a drill string 1313 is being run into the well, for the casing 2 to be cut.
  • Drill pipes are screwed together and stored in a fingerboard in a known manner, and the hoisting device 14 is used together with pipe-handling systems known per se to move and screw the drill string 1313 together in a conventional manner. This will therefore not be described in any further detail in what follows.
  • the drill string 1313 is held by the elevator 144 as it is being run in.
  • a cutting tool 8 for cutting the casing 2 is attached to the drill string 1313.
  • the drill string 1313 may be pulled back out and an attachment mechanism or pulling tool 1314 (see figure 3) may be connected to it and then run into the well and attached to the casing 2.
  • FIG 3 is shown the situation after a cut k, extending over the entire circumference of the casing 2, has been made in the casing 2.
  • the drill string 1313 has been run down with the attachment mechanism 1314 which is arranged to fixingly engage with the severed casing 2.
  • the attachment mechanism 1314 is connected to the casing 2, everything is ready for loosening the casing 2 and pulling it out.
  • the slips 1312 are attached after any slack in the hoisting device 14 has been pulled up and a force may be applied to the casing 2 through the drill string 1313 by means of the hoisting device 14.
  • the lifting device 12, shown here as jacks 12 is activated, lifting the entire gripping deck 13.
  • the jacks 12 have great power and can loosen elements that are stuck in the well, including casings 2 fixed by cementation, then.
  • the jacks 12 may raise the gripping deck by two to three metres, for example, and the loosened casing 2 will follow upwards.
  • the jacks 12 are shown at their maximum elevation.
  • the force of the slips 1312 and rotary table 1311 is removed and the casing 2 hangs from the hoisting device 14.
  • the lifting device 12 may thus be lowered again, figure 6, so that it is ready for a new lift if power exceeding the capacity of the hoisting device 14 is required.
  • the hoisting device 14 has hoisted the severed casing 2 up through the rotary table 1311. After that, the casing 2 is pulled in a manner known per se, by the casing 2 first being held fixed with the slips 1312 in the rotary table 1311 while the drill string 1313 is pulled out by means of the hoisting device 14. Further, in figure 8, the hoisting device 14 is lowered and the elevator 144 is attached to the casing 2 which is to be pulled. Then the slips 1312 may be disengaged so that the hoisting device 14 may hoist the casing 2 out of the well. When the casing 2 has been hoisted as far as it may, it is secured in the slips 1312 again before it is severed above the slips 1312. The elevator 144 is attached again and the hoisting device 14 activated anew. If, while the pulling is going on, additional power is needed, for example by the casing 2 being stuck, the lifting device 12 is activated anew.
  • the lifting device 12 may be used alone, without working together with a hoisting device, then, to loosen and hoist out casing 2. Further, in yet another embodiment, it is conceivable for the lifting device 12 to be arranged in such a way that it forms the lower part of the derrick 11, for example by the lifting device 12 comprising jacks as defined earlier herein, the jacks forming the legs of the derrick 11.

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)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

L'invention concerne un ensemble (1) tour de forage qui comprend une tour de forage (11) et un pont de préhension (13) qui comprend un dispositif de maintien (131) pour le maintien d'un tubage (2), l'ensemble (1) tour de forage étant caractérisé en ce qu'il comprend un dispositif de levage (12) conçu pour soulever le pont de préhension (13) conjointement avec le tubage (2). L'invention concerne également un procédé de desserrement et de traction d'un tubage (2) avec ledit ensemble (1) tour de forage.
EP15807466.6A 2014-06-10 2015-06-09 Ensemble tour de forage et son procédé d'utilisation Withdrawn EP3155207A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20140726A NO338208B1 (no) 2014-06-10 2014-06-10 Boretårnsammenstilling og fremgangsmåte for bruk av samme
PCT/NO2015/050105 WO2015190935A1 (fr) 2014-06-10 2015-06-09 Ensemble tour de forage et son procédé d'utilisation

Publications (2)

Publication Number Publication Date
EP3155207A1 true EP3155207A1 (fr) 2017-04-19
EP3155207A4 EP3155207A4 (fr) 2018-02-28

Family

ID=54833915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15807466.6A Withdrawn EP3155207A4 (fr) 2014-06-10 2015-06-09 Ensemble tour de forage et son procédé d'utilisation

Country Status (4)

Country Link
EP (1) EP3155207A4 (fr)
NO (1) NO338208B1 (fr)
SG (1) SG11201610124SA (fr)
WO (1) WO2015190935A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290495A (en) * 1979-06-18 1981-09-22 Hydra-Rig, Inc. Portable workover rig with extendable mast substructure, platform mounted drawworks and adjustable wellhead anchor
CA1185228A (fr) * 1981-06-01 1985-04-09 George I. Boyadjieff Verin de tubage de puits
US5704427A (en) * 1995-10-13 1998-01-06 Buck; David A. Portable well service rig
US6676327B2 (en) * 2001-04-16 2004-01-13 Benton F. Baugh Pin connection for clamping means
WO2011135541A2 (fr) * 2010-04-28 2011-11-03 Rolls-Royce Marine As Système modulaire à plusieurs trains d'exploitation destiné à des opérations sous-marines d'intervention et d'abandon
US20130319674A1 (en) * 2012-06-01 2013-12-05 Smith International, Inc. Rigless casing cutting/pulling stand

Also Published As

Publication number Publication date
NO338208B1 (no) 2016-08-08
NO20140726A1 (no) 2015-12-11
SG11201610124SA (en) 2017-01-27
WO2015190935A1 (fr) 2015-12-17
EP3155207A4 (fr) 2018-02-28

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