EP2513409B1 - Mouse hole dampening system - Google Patents
Mouse hole dampening system Download PDFInfo
- Publication number
- EP2513409B1 EP2513409B1 EP10798772.9A EP10798772A EP2513409B1 EP 2513409 B1 EP2513409 B1 EP 2513409B1 EP 10798772 A EP10798772 A EP 10798772A EP 2513409 B1 EP2513409 B1 EP 2513409B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- deck
- pipe
- tubular
- flange
- guide tube
- 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.)
- Not-in-force
Links
Images
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
Description
- 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 322116 - Another example of a mouse hole is shown in
NO 309537 - 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. -
US 4160060 describes a device for catching a falling object that comprises a large box-like structure to be placed under the deck. However, this structure must have a relatively large extent to be able to absorb the impact force. Hence it occupies a large valuable space. A space which could have been used for other types of necessary equipment. - Thus, there are no satisfactory 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 tofigure 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 infigure 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 amain tube 1 that stretches from the bottom part of the device up to the underside of adeck 2. The upper end of themain tube 1 lies against the underside of thedeck 2, but is not fastened to it. Anopening 3 is made in thedeck 2, which infigure 1 is closed by acover 4. Aguide tube 5 is placed outside themain tube 1. Alower flange 6 is placed just below theguide tube 5 and is, for example, welded to themain tube 1, but not to theguide tube 5. Theguide tube 5 is fastened, for example, welded at its upper end to the underside of thedeck 2. - The
guide tube 5 is also fitted with anintermediate support flange 7 which serves as a guide for thetension struts 8, as these pass through theflange 7 with a narrow clearance. - Four
tensions struts 8 are placed outside theguide tube 5. The number oftension struts 8 is not critical, but four tension struts give a good balance and distribution of the forces. Thetension struts 8 are fastened to thelower flange 6 in that the tension struts are fitted with threads at the bottom onto which nuts are screwed. At their upper ends, thetension struts 8 are fastened to thedeck 2 in a corresponding way. - The
main tube 1 is thereby suspended in thetension struts 8 from thedeck 2. -
Figure 2a shows a section through the device infigure 1 with apipe length 25 placed in the device. Adampening mechanism 26 is placed at the bottom of themain tube 1 to dampen small knocks from thepipe 25. -
Figure 2b shows theguide tube 5 separately. As one can see theguide tube 5 in this embodiment is fitted with anupper flange 27 that can be screwed securely to thedeck 2 via a recess in the deck as will be explained in more detail in connection withfigure 4 . The tension struts (seefigure 2a ) are screwed securely to theupper flange 27. Theintermediate flange 7 is preferably secured by welding. At this and at the bottom end of theguide tube 5triangular ribs 28 are secured by welding, which are set up to lie against the lower flange 6 (seefigure 2a ) on themain 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 thehole 3 in thedeck 2. -
Figure 2c shows themain tube 1 separately. It has an upper part 1a, above theflange 6, which is set up to be led into theguide tube 5 and alower part 1b, below theflange 6, which is set up to be located below theguide tube 5. At its bottom end abottom assembly 29 is arranged, which contains thedampening 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 theflange 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 thedeck 2.Figure 4b shows a plane outline of the same. Here, two mouse hole 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 astructure 11. This structure comprises in general a recess in thedeck 2 that carries theupper flange 27 from which the tension struts 8 are suspended and to which theguide tube 5 is securely welded. Themain tube 1 is received inside theguide tube 5 but not fastened to this. Theupper flange 27 also carries acentring 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 and4b theupper flange 27 is carried by a deck section orcollar 14. This rests on its side on two beams (not shown) that form a part of the carrying construction of thedeck 2. - The
structure 11 forms a box-like structure that has anupper surface 18 that joins the surface of thedeck 2. Here, an opening is formed forpipe 25. Afunnel 19 is arranged on the underside of the opening and contributes to guiding thepipe 25 down into the mouse hole. -
Figure 5 shows the lower part of the mouse hole. A dampeningmechanism 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 dampeningmechanism 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 themain tube 1 that is suspended in the tension struts 8. Because of this, themain 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 andfigure 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 theintermediate flange 7 are set up to guide themain 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 themain tube 1 will then lie a distance from theupper flange 27 and thelower flange 6 will lie a corresponding distance from the lower end of theguide 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 (9)
- Device to dampen the impact when a pipe (25) or a pipe stand falls down in a mouse hole arrangement, said mouse hole arrangement comprises at least one pipe receiving tubular (1) with a bottom (26), which tubular (1) is adapted to receive a pipe (25) or a pipe stand, characterised in that the at least one tubular (1) is connected to a first end of at least one stretch element (8) which at a second end is connected to a deck (2), or a structure that is permanently connected to the deck (2),
and that the at least one stretch element (8) is adapted to absorb the kinetic energy from the falling pipe (25) or pipe stand by going through a plastic deformation without breaking. - Device according to claim 1, characterised in that a guide tube (5) is arranged concentrically with the at least one tubular (1) and that the guide tube (5) is fastened to the deck (2) or a structure that is fastened to the deck (2).
- Device according to claim 2, characterised in that the at least one tubular (1) is fitted with a flange (6) for fastening of the first end of the at least one stretch element (8).
- Device according to claim 3, characterised in that the flange (6) is arranged on the at least one tubular (1) so that a considerable part of the tubular (1) is located between the flange (6) and the deck (2) and that the tubular (1) is fastened to the deck (2), or another structure which is fastened to the deck (2), solely via the at least one stretch element (8).
- Device according to claim 4, characterised in that it comprises a number of stretch elements (8) that run on the outside of the guide tube (5) and are placed mutually spaced apart around the guide tube (5).
- Device according to claim 5, characterised in that the guide tube (5) is fitted with a guide flange (7) about halfway between the flange (6) for fastening of the stretch elements (8) and the deck (2), through which guide flange (7) the stretch elements (8) extend with a very small clearance.
- Device according to one of the preceding claims, characterised in that the stretch element (8) is a tension strut.
- Device according to claim 7, characterised in that the tension strut has a larger diameter at its ends.
- Device according to claims 7 or 8, characterised in that the tension strut is manufactured from a ductile, stainless steel.
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 EP2513409A2 (en) | 2012-10-24 |
EP2513409B1 true 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)
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)
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 |
-
2009
- 2009-12-17 NO NO20093546A patent/NO330793B1/en not_active IP Right Cessation
-
2010
- 2010-12-17 EP EP14167290.7A patent/EP2792839B1/en not_active Not-in-force
- 2010-12-17 WO PCT/EP2010/070020 patent/WO2011083028A2/en active Application Filing
- 2010-12-17 EP EP10798772.9A patent/EP2513409B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP2792839B1 (en) | 2018-05-02 |
NO20093546A1 (en) | 2011-06-20 |
NO330793B1 (en) | 2011-07-18 |
WO2011083028A2 (en) | 2011-07-14 |
EP2513409A2 (en) | 2012-10-24 |
EP2792839A1 (en) | 2014-10-22 |
WO2011083028A3 (en) | 2011-10-20 |
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