EP2627863B1 - Guide post - Google Patents
Guide post Download PDFInfo
- Publication number
- EP2627863B1 EP2627863B1 EP11832814.5A EP11832814A EP2627863B1 EP 2627863 B1 EP2627863 B1 EP 2627863B1 EP 11832814 A EP11832814 A EP 11832814A EP 2627863 B1 EP2627863 B1 EP 2627863B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide post
- elastomeric matrix
- post according
- flange plate
- fixation foot
- 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.)
- Active
Links
- 239000011159 matrix material Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 241000446313 Lamella Species 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/10—Guide posts, e.g. releasable; Attaching guide lines to underwater guide bases
Definitions
- the present disclosure relates to a guide post for use in the final part of a guided lowering of equipment toward a predetermined point, or location, on the seabed, where the guide post is continued in a guide wire extending towards a structure on the sea surface.
- guide wires normally wire rope, and a guide post structure
- Such guide posts are often used to locate components on subsea bases during oil drilling or oil production, or to locate modules on top of each other.
- a guide base is normally placed around the conductor housing of a well to be drilled.
- the guide base has guide posts and these are used to position a blow out preventer BOP on top of the well head.
- Guide posts can also be used to install and position other modules, for example to guide and position a lower marine riser package LMRP onto a blow out preventer, or an emergency disconnect package on a well workover preventer.
- Such guide posts create a coarse alignment between the equipment and the well head and provides vertical stability in the system in order to be able to make connection to the wellhead. Final alignment is performed by the connector itself. Normally four guide wires and four guide posts will be used during a lowering operation.
- One object with the present invention has been to reduce risk for rupture or damage on the guide posts placed on top of a BOP.
- the guide posts are normally used to guide in place a LMRP down onto the BOP.
- a connector between the BOP and LMRP is opened and the LMRP is elevated off from the end piece on top of the BOP.
- One requirement to the current equipment is that this can take place within 5 degrees of angular difference between the riser and the LMRP.
- the guide posts can flex 5 degrees such that LMPR easily comes free.
- the drilling rig is positioned directly above the well, and guide wires are secured and tensioned by 40kN, for example, such that LMRP can be set down and securely landed.
- guide post of the introductory said kind which is distinguished in that a joint is introduced between the very guide post and a fixation foot designed for fixed attachment to a subsea construction, which joint is able to transfer axially acting forces simultaneously with suspending, or annulling, bending moments.
- the joint forms a support element that includes an elastomeric matrix located at the interface between the guide post and the fixation foot.
- a similar joint can be found in the document WO 2009093911 A1 which, however, is not referring to a guide post.
- the elastomeric matrix may include at least one embedded armoring lamella, such as a steel plate.
- the elastomeric matrix will be in the form of a rubber material, natural or synthetic, alternatively a polymeric material.
- the elastomeric matrix is vulcanized, glued or similar to a metal plate which in turn is secured to the fixation foot.
- the elastomeric matrix may also be loosely located within the fixation foot and be in the form of an insert element.
- the fixation foot includes a lower radially outwards directed flange plate, an upper radially outwards directed flange plate having upwards projecting hat shape for receipt of the elastomeric matrix and an anchor sub, with flange portion, secured to the guide post, which flange portion being designed to be clamped between the upper and lower flange plate via the elastomeric matrix.
- At least one sealing ring can, in addition, be included in the joint construction.
- a clearance can be present between the flange portion of the anchor sub and the lower flange plate, more precisely the more peripheral circumference of the flange portion and a radially inner portion of the lower flange plate.
- a clearance can be present between the circumferential area of the anchor sub and the inner radius of the upper flange plate.
- a guide post generally given the reference number 1, is shown.
- the guide post 1 is assembled of several parts, a lower (when in use) fixation foot 2, a joint means 3 and the post part 4 itself.
- the post part 4 has in turn an upper end piece 4a and a lower end piece 4b, which in a position of use is fixedly secured to the post part 4.
- a guide wire (not shown) is attached to the upper end piece 4a of the guide post 1 and extends upwards to the surface, normally to a surface vessel, for connection thereto.
- the lower end piece 4b is welded or by other means fixedly secured to the post part 4.
- fixation foot 2 is assembled by several parts. These parts are a lower radially outwards directed flange plate 2a having a series of holes around the perimeter thereof, an upper radially outwards directed flange plate 2b having corresponding holes and having an upwardly directed hat profile 2c forming a cavity for receipt of an elastomeric matrix 5, or elastomeric element 5, and one to the post part 4 fixed anchor pin 4c that is provided with a flange portion 4d. It is otherwise to be noted, with reference to fig.
- Fig. 4 shows in closer detail that the flange portion 4d is designed to be clamped between the upper and lower flange plate 2b, 2a via the elastomeric element 5.
- the element 5 is normally located, and acts, between the flange portion 4d and the internal top surface 2c' of the hat profile 2c. Notice that the make up (clamping) between the upper and lower flange plate 2b, 2a via the elastomeric element 5, normally results in pretension in the elastomeric element 5. This therefore provides a self aligning moment in the guide post 1 if the post is subjected to contemporary lateral forces.
- an elastomeric element it is also possible to vulcanize an elastomeric matrix 5 to one of the parts, either it be the flange part 4d, the internals of the hat part 2c, or to both parts.
- the element or the matrix can have armors 5a in the form of steel plates or other suitable material, in order to further reinforce or stiffening the matrix. This also increases the self restoring moment of the guide post 1.
- a clearance d 1 between the flange portion 4d of the anchor pin 4c and the lower flange plate 2a is deliberately provided. More precisely, this is at the more peripheral circumferential surface of the flange portion 4d and a radially inner portion of the lower flange plate 2a.
- the clearance d 1 decreases towards the central axis of the anchor pin 4c.
- This clearance enables the entire post part 4 to kink or tilt relative to the fixation foot 2 if the post part 4 is subjected to laterally acting forces.
- the element or matrix 5 enables such tilting motion to provide resistance, and more resistance the more the guide post 1 is kinked laterally.
- a limit at about 5 degrees of angular deflection is set, without this being considered as an absolute limit or restriction.
- Another clearance d 2 is provided between the circumferential surface 4c' of the anchor pin 4c and the internal radius 2b' of the upper flange plate 2b. This clearance d 2 is contributing to limit the angle that the post part 4 can adopt relative to the fixation foot 2.
- a joint is introduced between the post part 4 and the fixation foot 2.
- the fixation foot 2 is designed for fixed attachment to a subsea structure.
- the introduced joint is able to transfer axially acting forces at the same time as the joint annuls or suspends bending moments.
- Fig. 6 illustrates a situation where the guide post according to the present invention becomes particularly useful.
- the situation shown in fig. 6 will arise.
- the subsea equipment LMRP 20 is oriented relative to the subsea structure BOP 30 by means of four guide posts 1.
- the bias arises if a lifting crane for the subsea equipment LMRP 20, in addition to the vertical component, also provides a horizontal component. The horizontal component tends to pull the subsea equipment LMRP 20 in lateral direction at the same time as the vertical component lifts the equipment 20.
- the subsea equipment LMRP 20 will perform a tilting motion in that the guide posts 1 kink in their joints 3 during initial lifting, even if the tilting motion, or the angular deflection, is limited. As mentioned, this reduces the risk that the guide post 1 gets bent, or hurt in other ways, during a lifting operation. Subsequent to that the subsea equipment LMRP 20 is lifted clear from the guide posts 1, the elastomeric element 5 within each fixation foot 2 tends to restore the guide post 1 into a substantially vertical position.
- the proposed guide post 1 should be able to handle a tilting motion, or kinking, of the post part 4 up to about 5 degrees from the vertical, such as the arrow P 1 in fig. 5A-5C indicates.
- Typical tensile force in the guide wire under such an operation is 40kN, like the arrow P 2 in fig. 5A-5C indicates.
Description
- The present disclosure relates to a guide post for use in the final part of a guided lowering of equipment toward a predetermined point, or location, on the seabed, where the guide post is continued in a guide wire extending towards a structure on the sea surface.
- Guiding of subsea equipment down towards and onto well heads by use of guide wires, normally wire rope, and a guide post structure is commonly known. Such guide posts are often used to locate components on subsea bases during oil drilling or oil production, or to locate modules on top of each other. In drilling of a subsea well, for example, a guide base is normally placed around the conductor housing of a well to be drilled. The guide base has guide posts and these are used to position a blow out preventer BOP on top of the well head. Guide posts can also be used to install and position other modules, for example to guide and position a lower marine riser package LMRP onto a blow out preventer, or an emergency disconnect package on a well workover preventer.
- Such guide posts create a coarse alignment between the equipment and the well head and provides vertical stability in the system in order to be able to make connection to the wellhead. Final alignment is performed by the connector itself. Normally four guide wires and four guide posts will be used during a lowering operation.
- One object with the present invention has been to reduce risk for rupture or damage on the guide posts placed on top of a BOP. The guide posts are normally used to guide in place a LMRP down onto the BOP. In an emergency situation, a connector between the BOP and LMRP is opened and the LMRP is elevated off from the end piece on top of the BOP. One requirement to the current equipment is that this can take place within 5 degrees of angular difference between the riser and the LMRP. Thus it is to be understood that in such a situation there is a danger for breaking/damaging the guide posts.
- By the present invention, it is secured that the guide posts can flex 5 degrees such that LMPR easily comes free. By reinstallation, the drilling rig is positioned directly above the well, and guide wires are secured and tensioned by 40kN, for example, such that LMRP can be set down and securely landed.
- This is solved by guide post of the introductory said kind which is distinguished in that a joint is introduced between the very guide post and a fixation foot designed for fixed attachment to a subsea construction, which joint is able to transfer axially acting forces simultaneously with suspending, or annulling, bending moments.
- Preferably the joint forms a support element that includes an elastomeric matrix located at the interface between the guide post and the fixation foot. A similar joint can be found in the document
WO 2009093911 A1 which, however, is not referring to a guide post. - Further, the elastomeric matrix may include at least one embedded armoring lamella, such as a steel plate.
- Typically, the elastomeric matrix will be in the form of a rubber material, natural or synthetic, alternatively a polymeric material.
- Suitably, the elastomeric matrix is vulcanized, glued or similar to a metal plate which in turn is secured to the fixation foot.
- The elastomeric matrix may also be loosely located within the fixation foot and be in the form of an insert element.
- In a preferred embodiment, the fixation foot includes a lower radially outwards directed flange plate, an upper radially outwards directed flange plate having upwards projecting hat shape for receipt of the elastomeric matrix and an anchor sub, with flange portion, secured to the guide post, which flange portion being designed to be clamped between the upper and lower flange plate via the elastomeric matrix.
- Normally, the respective flange plates will be secured to each other by means of bolt connections.
- If desired or necessary, at least one sealing ring can, in addition, be included in the joint construction.
- A clearance can be present between the flange portion of the anchor sub and the lower flange plate, more precisely the more peripheral circumference of the flange portion and a radially inner portion of the lower flange plate.
- Further, a clearance can be present between the circumferential area of the anchor sub and the inner radius of the upper flange plate.
- Other and further objects, features and advantages will appear from the following description of preferred embodiments of the invention, which are given for the purpose of description, and given in context with the appended drawings where:
-
Fig. 1 shows in perspective view a guide post according to the invention, -
Fig. 2 shows in perspective view, the guide post according tofig. 1 with the parts taken apart, -
Fig. 3 shows somewhat exaggerated the lower part of the guide post shown infig. 2 , -
Fig. 4 shows in longitudinal cross section the lower part of the guide post according tofig. 3 in assembled state such as this part is shown infig.1 , -
Fig. 5A shows an elevational view of the guide post according to the invention having indicating arrows, in addition to a top view and bottom view, -
Fig. 5B shows a side view and a section line A-A, -
Fig. 5C shows a longitudinal section along the line A-A infig. 5B , and -
Fig. 6 shows a subsea equipment when it is about to be elevated off from a subsea structure and performs a tilting motion. - With reference to
fig. 1 , a guide post generally given thereference number 1, is shown. Theguide post 1 is assembled of several parts, a lower (when in use)fixation foot 2, a joint means 3 and thepost part 4 itself. - The
post part 4 has in turn an upper end piece 4a and a lower end piece 4b, which in a position of use is fixedly secured to thepost part 4. In a position of use, a guide wire (not shown) is attached to the upper end piece 4a of theguide post 1 and extends upwards to the surface, normally to a surface vessel, for connection thereto. Subsequent to mounting of thefixation foot 2, the lower end piece 4b is welded or by other means fixedly secured to thepost part 4. - Reference is now made to
fig. 2 and 3 which more clearly show that thefixation foot 2 is assembled by several parts. These parts are a lower radially outwards directedflange plate 2a having a series of holes around the perimeter thereof, an upper radially outwards directedflange plate 2b having corresponding holes and having an upwardly directedhat profile 2c forming a cavity for receipt of anelastomeric matrix 5, orelastomeric element 5, and one to thepost part 4 fixed anchor pin 4c that is provided with aflange portion 4d. It is otherwise to be noted, with reference tofig. 2 and 3 , that by assembling theguide post 1, the anchor pin 4c with itsflange part 4d firstly needs to be put down into arecess 2a' in thelower flange plate 2a, then theelastomeric element 5 is placed over the anchor pin 4c and down to abutment against the top surface of theflange part 4d before theupper flange part 2b is thread over the anchor pin 4c and laid by itshat profile 2c down against the top surface of theelastomeric element 5. This is clearly shown infigure 4 which will be described below. Then the lower end piece 4b of the post part 4is threaded over the anchor pin 4c before theelongated post part 4 is placed against the lower end piece 4b and welded thereto or fixed in another suitable way. -
Fig. 4 shows in closer detail that theflange portion 4d is designed to be clamped between the upper andlower flange plate elastomeric element 5. Theelement 5 is normally located, and acts, between theflange portion 4d and theinternal top surface 2c' of thehat profile 2c. Notice that the make up (clamping) between the upper andlower flange plate elastomeric element 5, normally results in pretension in theelastomeric element 5. This therefore provides a self aligning moment in theguide post 1 if the post is subjected to contemporary lateral forces. As an alternative to an elastomeric element, it is also possible to vulcanize anelastomeric matrix 5 to one of the parts, either it be theflange part 4d, the internals of thehat part 2c, or to both parts. - The element or the matrix can have
armors 5a in the form of steel plates or other suitable material, in order to further reinforce or stiffening the matrix. This also increases the self restoring moment of theguide post 1. - As it appears from
fig. 4 , a clearance d1 between theflange portion 4d of the anchor pin 4c and thelower flange plate 2a, is deliberately provided. More precisely, this is at the more peripheral circumferential surface of theflange portion 4d and a radially inner portion of thelower flange plate 2a. The clearance d1 decreases towards the central axis of the anchor pin 4c. This clearance enables theentire post part 4 to kink or tilt relative to thefixation foot 2 if thepost part 4 is subjected to laterally acting forces. The element ormatrix 5 enables such tilting motion to provide resistance, and more resistance the more theguide post 1 is kinked laterally. However, a limit at about 5 degrees of angular deflection is set, without this being considered as an absolute limit or restriction. - Another clearance d2 is provided between the circumferential surface 4c' of the anchor pin 4c and the
internal radius 2b' of theupper flange plate 2b. This clearance d2 is contributing to limit the angle that thepost part 4 can adopt relative to thefixation foot 2. - With such a design of the
guide post 1 as above described, a joint is introduced between thepost part 4 and thefixation foot 2. As mentioned, thefixation foot 2 is designed for fixed attachment to a subsea structure. The introduced joint is able to transfer axially acting forces at the same time as the joint annuls or suspends bending moments. -
Fig. 6 illustrates a situation where the guide post according to the present invention becomes particularly useful. Whensubsea equipment LMRP 20 is to be lifted from asubsea structure BOP 30, and theLMRP 20 is subjected to a bias, the situation shown infig. 6 will arise. In the illustrated situation, thesubsea equipment LMRP 20 is oriented relative to thesubsea structure BOP 30 by means of fourguide posts 1. The bias arises if a lifting crane for thesubsea equipment LMRP 20, in addition to the vertical component, also provides a horizontal component. The horizontal component tends to pull thesubsea equipment LMRP 20 in lateral direction at the same time as the vertical component lifts theequipment 20. Since thefixation feet 2 of the guide posts 1 are fixedly mounted to thesubsea structure BOP 30, thesubsea equipment LMRP 20 will perform a tilting motion in that the guide posts 1 kink in theirjoints 3 during initial lifting, even if the tilting motion, or the angular deflection, is limited. As mentioned, this reduces the risk that theguide post 1 gets bent, or hurt in other ways, during a lifting operation. Subsequent to that thesubsea equipment LMRP 20 is lifted clear from the guide posts 1, theelastomeric element 5 within eachfixation foot 2 tends to restore theguide post 1 into a substantially vertical position. - As indicated, the proposed
guide post 1 should be able to handle a tilting motion, or kinking, of thepost part 4 up to about 5 degrees from the vertical, such as the arrow P1 infig. 5A-5C indicates. Typical tensile force in the guide wire under such an operation is 40kN, like the arrow P2 infig. 5A-5C indicates.
Claims (10)
- A guide post (1) for use in the final part of a guided lowering of equipment (20) towards a predetermined point, or location (30), on the seabed, which guide post (1) is continued in a guide wire extending towards a structure on the sea surface, characterized in that it further comprises a joint (3) and a fixation foot (2), the joint (3) is introduced between the very guide post (4) and the fixation foot (2) designed for fixed attachment to a subsea structure, said joint (3) forms a support element including an elastomeric matrix (5) located at the interface between the guide post (4) and the fixation foot (2). so that said guide post (4) is able to transfer axially acting forces simultaneously with suspending, or annulling, bending moments.
- The guide post according to claim 1, characterized in that the elastomeric matrix (5) includes at least one embedded armoring lamella (5a), such as a steel plate.
- The guide post according to claim 1 or 2, characterized in that the elastomeric matrix (5) is in the form of a rubber material, natural or synthetic, alternatively a polymeric material.
- The guide post according to any of the claims 1-3, characterized in that the elastomeric matrix (5) is vulcanized, glued or similar to a metal plate which in turn is secured to the fixation foot (2).
- The guide post according to any of the claims 1-4, characterized in that the elastomeric matrix (5) is loosely located within the fixation foot (2) and is in the form of an insert element (5).
- The guide post according to any of the claims 1-5, characterized in that the fixation foot (2) includes a lower radially outwards directed flange plate (2a), an upper radially outwards directed flange plate (2b) having upwards projecting hat shape (2c) for receipt of the elastomeric matrix (5), and an anchor sub (4c), with flange portion (4d), secured to the guidepost (4), said flange portion (4d) being designed to be clamped between the upper and lower flange plate (2b, 2a) via the elastomeric matrix (5).
- The guide post according to any of the claims 1-6, characterized in that the respective flange plates (2a, 2b) are secured to each other by means of bolt connections.
- The guide post according to any of the claims 1-7, characterized in that at least one sealing ring, in addition, is included in the joint construction.
- The guide post according to any of the claims 1-8, characterized in that a clearance (d1) is present between the flange portion (4d) of the anchor sub (4c) and the lower flange plate (2a), more precisely the more peripheral circumference of the flange portion (4d) and a radially inner portion (2a') of the lower flange plate (2a).
- The guide post according to any of the claims 1-9, characterized in that a clearance (d2) is present between the circumferential area of the anchor sub (4c) and the inner radius of the upper flange plate (2b).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20101409A NO333368B1 (en) | 2010-10-12 | 2010-10-12 | guidepost |
PCT/NO2011/000290 WO2012050459A1 (en) | 2010-10-12 | 2011-10-11 | Guide post |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2627863A1 EP2627863A1 (en) | 2013-08-21 |
EP2627863A4 EP2627863A4 (en) | 2017-06-21 |
EP2627863B1 true EP2627863B1 (en) | 2018-12-26 |
Family
ID=45938504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11832814.5A Active EP2627863B1 (en) | 2010-10-12 | 2011-10-11 | Guide post |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2627863B1 (en) |
NO (1) | NO333368B1 (en) |
WO (1) | WO2012050459A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO333163B1 (en) * | 2011-11-25 | 2013-03-25 | Aker Subsea As | Activation mechanism for release of a guide post |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3451699A (en) * | 1966-05-02 | 1969-06-24 | Chevron Res | Coupling devices for use in offshore well work |
US3517517A (en) * | 1968-09-19 | 1970-06-30 | Pan American Petroleum Corp | Encapsulated cable for marine use |
US4142820A (en) * | 1977-01-13 | 1979-03-06 | Enterprise d'Equipments Mecaniques et Hydrauliques E.M.H. | Pivotal connecting device for pivotally connecting an off-shore articulated column structure to a sea bottom |
NO328221B1 (en) * | 2008-01-25 | 2010-01-11 | Vasshella As | Device at wellhead |
-
2010
- 2010-10-12 NO NO20101409A patent/NO333368B1/en unknown
-
2011
- 2011-10-11 WO PCT/NO2011/000290 patent/WO2012050459A1/en active Application Filing
- 2011-10-11 EP EP11832814.5A patent/EP2627863B1/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2012050459A9 (en) | 2018-01-25 |
WO2012050459A1 (en) | 2012-04-19 |
NO20101409A1 (en) | 2012-04-13 |
EP2627863A1 (en) | 2013-08-21 |
NO333368B1 (en) | 2013-05-13 |
EP2627863A4 (en) | 2017-06-21 |
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