EP2513409A2 - Mouse hole dampening system - Google Patents

Mouse hole dampening system

Info

Publication number
EP2513409A2
EP2513409A2 EP10798772A EP10798772A EP2513409A2 EP 2513409 A2 EP2513409 A2 EP 2513409A2 EP 10798772 A EP10798772 A EP 10798772A EP 10798772 A EP10798772 A EP 10798772A EP 2513409 A2 EP2513409 A2 EP 2513409A2
Authority
EP
European Patent Office
Prior art keywords
pipe
deck
tube
flange
mouse hole
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
Application number
EP10798772A
Other languages
German (de)
French (fr)
Other versions
EP2513409B1 (en
Inventor
Dag Magnus Holen
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.)
TTS Sense As
Original Assignee
TTS Sense 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 TTS Sense As filed Critical TTS Sense As
Priority to EP14167290.7A priority Critical patent/EP2792839B1/en
Publication of EP2513409A2 publication Critical patent/EP2513409A2/en
Application granted granted Critical
Publication of EP2513409B1 publication Critical patent/EP2513409B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole

Definitions

  • the present invention relates to a device to dampen impacts when a pipe or a pipe stand falls down into a so-called mouse hole.
  • a mouse hole is used to temporarily place pipes in connection with drilling operations and is also used to build up pipe stands. This is described in detail in NO 3221 16 which belongs to the applicant. That publication is hereby incorporated in the present application by reference.
  • Mouse holes have developed from one single hole in the ground on land-based rigs to sophisticated solutions, such as the above mentioned, placed on offshore installations.
  • a problem that has existed almost from the start is that pipes that shall be placed in the mouse hole are sometimes dropped down into the hole, either because the operator is careless or because an accident happens. If this occurs the pipe will go straight through the mouse hole, and also what may be underneath, and could cause serious damages to, for example, a floating installation, or even to the wellhead on the ocean bed. This can again lead to release of well fluid and consequent serious discharge damages.
  • dampening devices which shall dampen the impact from a pipe that falls, or is dropped, down into the mouse hole.
  • US 3,689,060 which describes a mouse hole that is fitted with a piston-like carrier at the bottom of the mouse hole.
  • the carrier is spring loaded such that the carrier moves downwards against the spring force when it is hit by the pipe.
  • This dampening mechanism may function satisfactorily if the pipe is not too solid or is not dropped from too great a height.
  • long pipe lengths (stands) are often used these days, encompassing three or four individual pipes. This means that the pipe body has a considerable mass in total. In some cases, the pipe body is also fitted with a weight pipe or other components that increase the mass considerably.
  • a dampening mechanism as in the above mentioned US 3,689,060 will then be too weak.
  • US 5,468,121 shows another example of a dampening device.
  • an air-filled bellows is used to dampen the impact.
  • the bellows would not be able to withstand the large forces exerted by the pipe body either.
  • Figure 1 shows a mouse hole device according to a first embodiment of the invention
  • Figure 2a shows a section through the device according to figure 1 ,
  • Figure 2b shows the guide pipe separated from the other components according to the invention
  • FIG. 2c shows the main pipe separated from the other components according to the invention
  • Figure 3a shows the device according to the invention before it has been subjected to falling pipes
  • Figure 3b shows the device according to the invention after it has caught a falling pipe
  • Figure 4a shows a detailed section of the device with the fastening against the deck
  • Figure 4b shows a plane outline of the device in figure 4a
  • Figure 5 shows a detailed section of the bottom end of the device.
  • Figure 1 shows a mouse hole device, denoted only as a mouse hole in the following for the sake of simplicity, according to a first embodiment of the invention. It comprises a main tube 1 that stretches from the bottom part of the device up to the underside of a deck 2. The upper end of the main tube 1 lies against the underside of the deck 2, but is not fastened to it. An opening 3 is made in the deck 2, which in figure 1 is closed by a cover 4. A guide tube 5 is placed outside the main tube 1 . A lower flange 6 is placed just below the main tube 1 and is, for example, welded to the main tube 1 , but not to the guide tube 5. The guide tube 5 is fastened, for example, welded at its upper end to the underside of the deck 2. The guide tube 2 is also fitted with an intermediate support flange 7 which serves as a guide for the tension struts 8, as these pass through the flange 7 with a narrow clearance.
  • tensions struts 8 are placed outside the guide tube 5.
  • the number of tension struts 8 is not critical, but four tension struts give a good balance and distribution of the forces.
  • the tension struts 8 are fastened to the lower flange 6 in that the tension struts are fitted with threads at the bottom onto which nuts are screwed. At their upper ends, the tension struts 8 are fastened to the deck 2 in a corresponding way.
  • the main tube 1 is thereby suspended in the tension struts 8 from the deck 2.
  • Figure 2a shows a section through the device in figure 1 with a pipe length 25 placed in the device.
  • a dampening mechanism 26 is placed at the bottom of the main tube 1 to dampen small knocks from the pipe 25.
  • Figure 2b shows the guide tube 5 separately.
  • the guide tube 5 in this embodiment is fitted with an upper flange 27 that can be screwed securely to the deck 2 via a recess in the deck as will be explained in more detail in connection with figure 4.
  • the tension struts (see figure 2a) are screwed securely to the upper flange 27.
  • the intermediate flange 7 is preferably secured by welding.
  • three triangular ribs 28 are secured by welding, which are set up to lie against the lower flange 6 (see figure 2a) on the main tube 1 , so that a good contact surface is made and to prevent that the mouse hole gets stuck when hoisted up or lowered down through the hole 3 in the deck 2.
  • Figure 2c shows the main tube 1 separately. It has an upper part 1 a, above the flange 6, which is set up to be led into the guide tube 5 and a lower part 1 b, below the flange 6, which is set up to be located below the guide tube 5. At its bottom end a bottom assembly 29 is arranged, which contains the dampening mechanism 26.
  • the tension struts 8 have preferably a somewhat larger diameter at their upper and lower ends than in the middle section. This ensures that the extension occurs in the middle section and that the tension struts do not break at the fastening points.
  • Figure 4a shows a section through the device at the deck 2.
  • Figure 4b shows a plane outline of the same.
  • two mouse hold devices according to the invention are shown placed next to each other.
  • the guide tube 5 and the tension struts 8 are not directly fastened to the deck, but via a structure 1 1 .
  • This structure comprises in general a recess in the deck 2 that carries the upper flange 27 from which the tension struts 8 are suspended and to which the guide tube 5 is securely welded.
  • the main tube 1 is received inside the guide tube 5 but not fastened to this.
  • the upper flange 27 also carries a centring device 13, which is not part of this invention and shall therefore not be explained in more detail.
  • the upper flange 27 is carried by a deck section or collar 14. This rests on its side on two beams (not shown) that form a part of the carrying construction of the deck 2.
  • the structure 1 1 forms a box-like structure that has an upper surface 18 that joins the surface of the deck 3.
  • an opening is formed for pipe 25.
  • a funnel 19 is arranged on the underside of the opening and contributes to guiding the pipe 25 down into the mouse hole.
  • Figure 5 shows the lower part of the mouse hole.
  • a dampening mechanism 26 is arranged here, which is capable of absorbing smaller knocks as a
  • the dampening mechanism 26 comprises a thick rubber body that shall dampen the impact from knocks.
  • the rubber body is covered with a soft stainless steel plate onto which the pipes are placed. If a heavy pipe should fall down in the mouse hole, this dampening mechanism will only absorb a very small part of the kinetic energy. If this is exceeded the dampening device according to the invention will take over the absorption of the impact.
  • the diameter and ductility of the tension struts are adjusted so that they are capable of absorbing the largest expected kinetic energy from the falling pipe without breaking and with a good safety margin. As these extensions absorb the forces from the pipe it will be only these forces that are led further out in the system. Thus, it is easy to dimension the struts so that the forces from these will not lead to appreciable, incidental damage to the mouse hole construction.
  • the guide tube 5 and the intermediate flange 7 are set up to guide the main tube 1 and ensure that the tension struts are stretched evenly and no lopsided position occurs. If one of the tension struts has a fault, the other tensions struts will have sufficient capacity to absorb the energy from a maximum falling load.
  • the main tube After the tension struts 8 have been extended plastically, the main tube will have been displaced a distance downwards, as shown in figure 3. The top of the main tube 1 will then lie a distance from the upper flange 27 and the lower flange 6 will lie a corresponding distance from the lower end of the guide tube 5. This distance can be detected so that one can get a clear indication that the tension struts 8 have gone through a plastic deformation.
  • the tension struts are relatively cheap components that are made from a cheap material. They are preferably manufactured from a soft stainless steel, such as, for example, 316L.
  • the dampening device is also used in mouse holes of a variable length, for example, a telescopic mouse hole.
  • the tension struts will then preferably be connected to the uppermost of the telescopic tubes, which are secured to the deck.
  • the number of tension struts can be varied. It is an advantage if the number can be chosen so that there is redundancy in the system i.e. that even if one or more of the tension struts should accidentally break, the others will have sufficient capacity to be able to absorb the forces.
  • tension struts in the form of rods, the tension struts can also have different forms, for example, tubes.

Abstract

Device to dampen the impact when a pipe or a stand of pipes falls down in a mouse hole device, said mouse hole device comprises at least one tube (1) with a bottom that is set up to receive a pipe or a pipe stand (25). The at least one tube (1) is connected to a first end of at least one stretch element (8) which at its other end is connected to a deck (2) or a structure (27) which has a fixed connection to the deck (2) and that the at least one stretch element (8) is set up to go through a plastic deformation without breaking when it is subjected to a falling pipe (25) or pipe stand that exceeds a certain kinetic energy.

Description

Mouse hole dampening system
The present invention relates to a device to dampen impacts when a pipe or a pipe stand falls down into a so-called mouse hole.
A mouse hole is used to temporarily place pipes in connection with drilling operations and is also used to build up pipe stands. This is described in detail in NO 3221 16 which belongs to the applicant. That publication is hereby incorporated in the present application by reference.
Another example of a mouse hole is shown in NO 309537. This also belongs to the applicant and is hereby incorporated by reference.
Mouse holes have developed from one single hole in the ground on land-based rigs to sophisticated solutions, such as the above mentioned, placed on offshore installations. A problem that has existed almost from the start is that pipes that shall be placed in the mouse hole are sometimes dropped down into the hole, either because the operator is careless or because an accident happens. If this occurs the pipe will go straight through the mouse hole, and also what may be underneath, and could cause serious damages to, for example, a floating installation, or even to the wellhead on the ocean bed. This can again lead to release of well fluid and consequent serious discharge damages.
Therefore, there are several types of dampening devices which shall dampen the impact from a pipe that falls, or is dropped, down into the mouse hole.
Examples of this are:
US 3,689,060, which describes a mouse hole that is fitted with a piston-like carrier at the bottom of the mouse hole. The carrier is spring loaded such that the carrier moves downwards against the spring force when it is hit by the pipe. This dampening mechanism may function satisfactorily if the pipe is not too solid or is not dropped from too great a height. However, long pipe lengths (stands) are often used these days, encompassing three or four individual pipes. This means that the pipe body has a considerable mass in total. In some cases, the pipe body is also fitted with a weight pipe or other components that increase the mass considerably. A dampening mechanism as in the above mentioned US 3,689,060 will then be too weak.
US 5,468,121 shows another example of a dampening device. Here, an air- filled bellows is used to dampen the impact. With today's massive pipe bodies, the bellows would not be able to withstand the large forces exerted by the pipe body either.
Thus, there are no dampening devices today that will be able to catch the large forces from a falling pipe. One thing is that the pipe will be damaged or the dampening device can be damaged. Another, and more serious thing, is that the pipe can break through the mouse hole and damage equipment that may be underneath the mouse hole. It is also possible that a pipe falls all the way down in the water and damages equipment below the rig. The problem which the present invention aims to solve is to ensure that falling pipes are held in the mouse hole and cause the least possible damage. It is also an aim that any damages which may occur are to components that can easily be replaced. These and other problems are solved by the characteristic features in the subsequent claim 1 .
The dependent claims describe advantageous embodiments of the invention.
The invention shall now be explained in more detail with reference to the enclosed drawings, where:
Figure 1 shows a mouse hole device according to a first embodiment of the invention, Figure 2a shows a section through the device according to figure 1 ,
Figure 2b shows the guide pipe separated from the other components according to the invention,
Figure 2c shows the main pipe separated from the other components according to the invention,
Figure 3a shows the device according to the invention before it has been subjected to falling pipes,
Figure 3b shows the device according to the invention after it has caught a falling pipe,
Figure 4a shows a detailed section of the device with the fastening against the deck,
Figure 4b shows a plane outline of the device in figure 4a, and
Figure 5 shows a detailed section of the bottom end of the device.
Figure 1 shows a mouse hole device, denoted only as a mouse hole in the following for the sake of simplicity, according to a first embodiment of the invention. It comprises a main tube 1 that stretches from the bottom part of the device up to the underside of a deck 2. The upper end of the main tube 1 lies against the underside of the deck 2, but is not fastened to it. An opening 3 is made in the deck 2, which in figure 1 is closed by a cover 4. A guide tube 5 is placed outside the main tube 1 . A lower flange 6 is placed just below the main tube 1 and is, for example, welded to the main tube 1 , but not to the guide tube 5. The guide tube 5 is fastened, for example, welded at its upper end to the underside of the deck 2. The guide tube 2 is also fitted with an intermediate support flange 7 which serves as a guide for the tension struts 8, as these pass through the flange 7 with a narrow clearance.
Four tensions struts 8 are placed outside the guide tube 5. The number of tension struts 8 is not critical, but four tension struts give a good balance and distribution of the forces. The tension struts 8 are fastened to the lower flange 6 in that the tension struts are fitted with threads at the bottom onto which nuts are screwed. At their upper ends, the tension struts 8 are fastened to the deck 2 in a corresponding way.
The main tube 1 is thereby suspended in the tension struts 8 from the deck 2.
Figure 2a shows a section through the device in figure 1 with a pipe length 25 placed in the device. A dampening mechanism 26 is placed at the bottom of the main tube 1 to dampen small knocks from the pipe 25.
Figure 2b shows the guide tube 5 separately. As one can see the guide tube 5 in this embodiment is fitted with an upper flange 27 that can be screwed securely to the deck 2 via a recess in the deck as will be explained in more detail in connection with figure 4. The tension struts (see figure 2a) are screwed securely to the upper flange 27. The intermediate flange 7 is preferably secured by welding. At this and at the bottom end of the guide tube 5 three triangular ribs 28 are secured by welding, which are set up to lie against the lower flange 6 (see figure 2a) on the main tube 1 , so that a good contact surface is made and to prevent that the mouse hole gets stuck when hoisted up or lowered down through the hole 3 in the deck 2.
Figure 2c shows the main tube 1 separately. It has an upper part 1 a, above the flange 6, which is set up to be led into the guide tube 5 and a lower part 1 b, below the flange 6, which is set up to be located below the guide tube 5. At its bottom end a bottom assembly 29 is arranged, which contains the dampening mechanism 26.
As one can see in figure 2a the tension struts are fitted with nuts 9. These nuts 9 are set up to fasten the tension struts 8 to the flange 6.
The tension struts 8 have preferably a somewhat larger diameter at their upper and lower ends than in the middle section. This ensures that the extension occurs in the middle section and that the tension struts do not break at the fastening points.
Figure 4a shows a section through the device at the deck 2. Figure 4b shows a plane outline of the same. Here, two mouse hold devices according to the invention are shown placed next to each other.
The guide tube 5 and the tension struts 8 are not directly fastened to the deck, but via a structure 1 1 . This structure comprises in general a recess in the deck 2 that carries the upper flange 27 from which the tension struts 8 are suspended and to which the guide tube 5 is securely welded. The main tube 1 is received inside the guide tube 5 but not fastened to this. The upper flange 27 also carries a centring device 13, which is not part of this invention and shall therefore not be explained in more detail.
In the embodiment according to the figures 4a and 4b the upper flange 27 is carried by a deck section or collar 14. This rests on its side on two beams (not shown) that form a part of the carrying construction of the deck 2.
The structure 1 1 forms a box-like structure that has an upper surface 18 that joins the surface of the deck 3. Here, an opening is formed for pipe 25. A funnel 19 is arranged on the underside of the opening and contributes to guiding the pipe 25 down into the mouse hole. Figure 5 shows the lower part of the mouse hole. A dampening mechanism 26 is arranged here, which is capable of absorbing smaller knocks as a
consequence of the normal setting down of pipes. This is formed to prevent damage to the threads of the pipe if it is put down too hard in the mouse hole. At the same time the pipe is centred and it is formed to drain any sludge or oil residues. The dampening mechanism 26 comprises a thick rubber body that shall dampen the impact from knocks. The rubber body is covered with a soft stainless steel plate onto which the pipes are placed. If a heavy pipe should fall down in the mouse hole, this dampening mechanism will only absorb a very small part of the kinetic energy. If this is exceeded the dampening device according to the invention will take over the absorption of the impact.
The operation of the dampening mechanism will now be explained in more detail.
When a pipe falls down in the mouse hole it will hit, via the dampening mechanism 26, the bottom of the main tube 1 that is suspended in the tension struts 8. Because of this, the main tube 1 will be pulled downwards and the forces will be absorbed by the tension struts 8. The tension struts 8 are made from a ductile material that withstands a considerable plastic extension before breaking. The tension struts will therefore have a plastic extension. As the tension struts 8 have a larger diameter at their ends, the plastic extension will occur over the middle part of the tension struts where the surface is smooth and without substantial notches. At the fastening points, the tension struts have necessarily several notches and the movements are therefore small here and, in the main, elastic. Figure 3a shows the state before the tension struts 8 have been extended and figure 3b shows the state after the extension.
The diameter and ductility of the tension struts are adjusted so that they are capable of absorbing the largest expected kinetic energy from the falling pipe without breaking and with a good safety margin. As these extensions absorb the forces from the pipe it will be only these forces that are led further out in the system. Thus, it is easy to dimension the struts so that the forces from these will not lead to appreciable, incidental damage to the mouse hole construction.
The guide tube 5 and the intermediate flange 7 are set up to guide the main tube 1 and ensure that the tension struts are stretched evenly and no lopsided position occurs. If one of the tension struts has a fault, the other tensions struts will have sufficient capacity to absorb the energy from a maximum falling load.
After the tension struts 8 have been extended plastically, the main tube will have been displaced a distance downwards, as shown in figure 3. The top of the main tube 1 will then lie a distance from the upper flange 27 and the lower flange 6 will lie a corresponding distance from the lower end of the guide tube 5. This distance can be detected so that one can get a clear indication that the tension struts 8 have gone through a plastic deformation.
If a plastic deformation of the tension struts 8 has happened, the tension struts must be replaced. This can be simply carried out by unscrewing the nuts at each end of the tension struts and replacing the tension struts 8 with new struts.
Strong impacts can be absorbed in this way with minimal damage to the components. The tension struts are relatively cheap components that are made from a cheap material. They are preferably manufactured from a soft stainless steel, such as, for example, 316L.
Although it is dampening of impacts in a mouse hole with a given length which is described above, the dampening device is also used in mouse holes of a variable length, for example, a telescopic mouse hole. The tension struts will then preferably be connected to the uppermost of the telescopic tubes, which are secured to the deck.
The number of tension struts can be varied. It is an advantage if the number can be chosen so that there is redundancy in the system i.e. that even if one or more of the tension struts should accidentally break, the others will have sufficient capacity to be able to absorb the forces.
Instead of tension struts in the form of rods, the tension struts can also have different forms, for example, tubes.

Claims

Claims
1.
Device to dampen the impact when a pipe or a pipe stand falls down in a mouse hole arrangement, said mouse hole arrangement comprises at least one pipe with a bottom, that is adapted to receive a pipe or a pipe stand, characterised in that the at least one tube is connected to a first end of at least one stretch element which at its other end is connected to a deck, or a structure that is permanently connected to the deck, and that the at least one stretch element is adapted to absorb the kinetic energy from the falling pipe or pipe stand by going through a plastic deformation without breaking.
2.
Device according to claim 1, characterised i n that a guide tube is arranged concentrically with the at least one tube and that the guide tube is fastened to the deck or a structure that is fastened to the deck.
3.
Device according to claims 1 or 2, characterised in that the at least one tube is fitted with a flange for fastening of the at least first end of the stretch element.
4.
Device according to claim 3, cha racterised in that the flange is arranged on the at least one tube so that a considerable part of the tube is located between the flange and the deck and that the tube is only fastened to the deck, or another structure which is fastened to the deck, via the stretch elements.
5.
Device according to claim 4, characterised in that it comprises a number of stretch elements that run on the outside of the guide tube and are placed mutually spaced apart around the guide tube.
6.
Device according to claim 5, characterised in that the guide tube is fitted with a guide flange about halfway between the flange for fastening of the stretch elements and the deck, through which guide flange the stretch elements extend with a very small clearance.
7.
Device according to one of the preceding claims, characterised in that the stretch element is a tension strut.
8.
Device according to claim 7, characterised i n that the tension strut has a larger diameter at its ends.
9.
Device according to claims 7 or 8, characterised in that the tension strut is manufactured from a ductile, stainless steel.
EP10798772.9A 2009-12-17 2010-12-17 Mouse hole dampening system Not-in-force EP2513409B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14167290.7A EP2792839B1 (en) 2009-12-17 2010-12-17 Mouse hole dampening system and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093546A NO330793B1 (en) 2009-12-17 2009-12-17 Mousepad muffler
PCT/EP2010/070020 WO2011083028A2 (en) 2009-12-17 2010-12-17 Mouse hole dampening system

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP14167290.7A Division EP2792839B1 (en) 2009-12-17 2010-12-17 Mouse hole dampening system and method
EP14167290.7A Division-Into EP2792839B1 (en) 2009-12-17 2010-12-17 Mouse hole dampening system and method

Publications (2)

Publication Number Publication Date
EP2513409A2 true EP2513409A2 (en) 2012-10-24
EP2513409B1 EP2513409B1 (en) 2014-06-11

Family

ID=44059091

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14167290.7A Not-in-force EP2792839B1 (en) 2009-12-17 2010-12-17 Mouse hole dampening system and method
EP10798772.9A Not-in-force EP2513409B1 (en) 2009-12-17 2010-12-17 Mouse hole dampening system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14167290.7A Not-in-force EP2792839B1 (en) 2009-12-17 2010-12-17 Mouse hole dampening system and method

Country Status (3)

Country Link
EP (2) EP2792839B1 (en)
NO (1) NO330793B1 (en)
WO (1) WO2011083028A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20111133A1 (en) 2011-08-17 2013-02-18 Aker Mh As A mouse hole device
NO341038B1 (en) * 2013-08-12 2017-08-07 Mhwirth As Muffler for falling pipes in mouse holes
KR101563672B1 (en) * 2014-03-25 2015-10-27 삼성중공업 주식회사 Marine structure
EP3898403A4 (en) * 2018-12-21 2023-02-22 Zentech, Inc. A sock for a floating vessel

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US690676A (en) * 1901-09-20 1902-01-07 George F Tait Tubing-protector for oil-wells.
US3689060A (en) 1970-08-19 1972-09-05 William Burton Hensley Jr Retainer device
US3966054A (en) * 1975-05-22 1976-06-29 Bj-Hughes Inc. Shock absorber for tubular storage or drill stands on a drilling ship
US4160060A (en) * 1978-01-23 1979-07-03 Continental Oil Company Platform safety barrier
US5468121A (en) * 1994-02-08 1995-11-21 Stogner; Huey Apparatus and method for positioning drill pipe in a mousehole
NO309537B1 (en) 1999-03-03 2001-02-12 Eng & Drilling Machinery As Device at a drilling deck on a drilling platform
NO322116B1 (en) 2004-12-01 2006-08-14 Sense Edm As Device for building up and down rudder sections
NO333743B1 (en) * 2005-10-12 2013-09-09 Nat Oilwell Norway As Device at drill floor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011083028A2 *

Also Published As

Publication number Publication date
EP2792839B1 (en) 2018-05-02
EP2513409B1 (en) 2014-06-11
NO20093546A1 (en) 2011-06-20
NO330793B1 (en) 2011-07-18
WO2011083028A2 (en) 2011-07-14
EP2792839A1 (en) 2014-10-22
WO2011083028A3 (en) 2011-10-20

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