NO343099B1 - First subsea structure with guiding groove for mating with second subsea structure, and assembly comprising the first and second subsea structures - Google Patents
First subsea structure with guiding groove for mating with second subsea structure, and assembly comprising the first and second subsea structures Download PDFInfo
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- NO343099B1 NO343099B1 NO20162035A NO20162035A NO343099B1 NO 343099 B1 NO343099 B1 NO 343099B1 NO 20162035 A NO20162035 A NO 20162035A NO 20162035 A NO20162035 A NO 20162035A NO 343099 B1 NO343099 B1 NO 343099B1
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- subsea structure
- guide
- subsea
- guide element
- guiding groove
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- 230000013011 mating Effects 0.000 title claims abstract description 19
- 238000009434 installation Methods 0.000 description 7
- 230000004323 axial length Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000295 complement effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- 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
-
- 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
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention relates to first subsea structure for mating with a second subsea structure, and an assembly comprising the first and second subsea structures, the first subsea structure comprises:- a supporting part (14, 13) which supports at least two guide elements (2), the guide elements extending mainly parallel from each other and to a distance away from the supporting part,- each guide element (2) being configured for axial guiding and aligning with a guide post (5) on the second subsea structure and wherein the guide elements (2) are formed with a guiding groove (4) extending in the longitudinal direction of the guide element (2), and- the guiding groove (4) extending at least partly along a length of the guide element (2), and wherein the guiding groove (4) is configured to accommodate the guidepost.
Description
The invention relates to a first subsea structure for mating with a second subsea structure and an assembly comprising the first subsea structure and the second subsea structure.
Background of the invention
Subsea structures and installations are normally provided with e.g. four guidefunnels for guiding and aligning with accompanied guidepipes (one in each corner to cooperate with guideposts on preinstalled subsea structures). Such preinstalled subsea structures may be e.g. well slots in manifolds or templates, X-mas trees, foundations, flow control modules etc. During installation and/or retrieving operations of subsea equipment, the guidefunnels and accompanied guidepipes are guided onto the guideposts to secure proper installation of the subsea equipment. The operations are normally performed either with guidelines or guidelineless (i.e. without guidelines).
The subsea equipment may be any equipment normally used subsea, where alignment or orientation of the equipment relative a pre-installed equipment is of importance.
However, such guidefunnels and guidepipes/guidecylinders are normally of substantive size, making a significant impact on the total weight of the equipment they are connected. Furthermore, during installation of the guidefunnel(s) and accompanied guidepipe(s) on the guidepost(s), there is a potential risk that if the guidepipe(s) is not sufficiently aligned with their respective guidepost, that one or more of the guideposts jam or get stuck in their respective guidepipe. Thus, the guidepipe and guidepost have to be properly aligned before mating.
It is an objective of the invention to overcome at least one of the drawbacks in the prior art solutions.
Another of the objectives of the invention is to provide a guiding system with reduced weight.
A further objective of the invention is to provide a guiding system where the risk of jamming of the guidepost inside the guidepipe is mitigated or minimized.
Yet another objective of the present invention is to provide a first subsea structure allowing up to 15 degrees misalignment relative a second subsea structure, to which second subsea structure the first subsea structure is to be mated.
The invention is set forth and characterized in the independent claims, while the dependent claims describe other characteristics of the invention.
Summary of the invention
The present invention allows for up to approximately 15 degrees misalignment between the guidepost and the guide element during mating of a first subsea structure with a second subsea structure.
The invention relates to a first subsea structure for mating with a second subsea structure,
the first subsea structure comprises:
- a supporting part which supports at least two guide elements, the guide elements extending mainly parallel from each other and to a distance away from the supporting part,
- each guide element being configured for axial guiding and aligning with a guide post on the second subsea structure and wherein the guide elements are formed with a guiding groove extending in the longitudinal direction of the guide element, and - the guiding groove extending at least partly along a length of the guide element, and wherein the guiding groove is configured to accommodate the guidepost.
The first subsea structures may be exemplified as, but not limited to, well slots in manifolds or templates, horizontal and vertical X-mas trees, foundations, flow control modules etc. These structures may have guide structures comprising a central ring attached to said connector, and support arms connected to guidefunnels in its outer ends. The guidefunnels are connected to guidepipes which may have a variety of lengths. The present invention relates to a new guide system to replace at least the prior art guidepipes.
The second subsea structure may be well slots in manifolds or templates, horizontal and vertical X-mas trees, foundations, flow control modules etc.
The supporting part can support the guide elements indirectly or directly. An example of indirect support may include using a guidefunnel section which is connected to an end of the supporting part and wherein the guide elements may be provided as extensions of the guidefunnel section. The supporting part may comprise a connector interface in a center portion of the first subsea structure, and a number of support arms extending outwards from the connector interface towards separate guide elements, and then neighboring guide elements may be connected to each other using beams or longitudinal elements forming an outer frame structure. Alternatively, the support arms may extend outwards and be connected to the outer frame structure, to which outer frame structure the separate guide elements are connected.
The guiding groove, also named longitudinal opening, is configured to accommodate the guidepost. This means that the largest width of the guiding groove is equal to or larger than the largest width of the guidepost. If the guidepost is a spherical cylinder, the largest width of the guidepost is equal to the diameter of the guidepost. If the guidepost is of quadratic shape, the largest width is the diagonal distance from two corners in the quadrat etc., and the width of the guiding groove is at least equal to or larger than this diagonal distance. Summarized, a transverse width of the guiding groove is larger than a largest width of a transverse cross section of the guidepost.
Axial guiding and aligning of the guide element on the first subsea structure with the at least one guidepost on the second subsea structure, shall be understood such that during normal operations, the first and second subsea structures are mated in a substantial longitudinal direction. E.g. if the second subsea structure with the guideposts is installed subsea, the first subsea structure with the guide elements is lowered down onto the second subsea structure, normally with an orientation close to vertical such that the guide elements enters the top of the guideposts (i.e. the uppermost part of the guidepost) first, before the first subsea structure is guided and aligned down onto the second subsea structure. An alternative application will have to firstly install the first subsea structure with the guide elements, and then lower the second subsea structure with the guideposts (upside down) for guiding and aligning with the first subsea structure. The guide elements will cooperate with the guideposts and secure a proper guiding and aligning between first and second structures.
The guide element ha a guiding groove, i.e. longitudinal opening, in its circumference. The circumference of the guide element shall be understood as the part of the guide element forming the shape of the guide element, i.e. if the guide element is formed of a concave plate, the circumference is to be understood as the length of the guide element in a direction transverse to the axial length of the guide element. The guiding groove is then formed of the remaining “imaginary” circumference forming a full circumference. The guiding groove may extend along a part of the axial length of the guide element, or alternatively the whole axial length of the guide element.
That is, if having three guide elements of similar shape, each of the guide elements forms at least 1/3 of a full circumference. Furthermore, if having four guide elements of similar shape, each of the guide elements forms at least 1⁄4 of a full circumference.
The total number of guide elements, and shape of guiding grooves, may together form at least a full circumference, i.e. 360 degrees, such as to secure guiding in all radial directions of the guide element. This means that if all guide elements are projected onto a surface, they will form a full 360 degrees circumference, such as a circle, oval, rectangle, quadrat, polygon etc. In other words, the guide elements may together form a closed circumference relative the outer circumference of the guidepost.
In other words, the guiding groove, i.e. longitudinal opening, is defined by a first longitudinal end surface A in the circumference and a second longitudinal end surface B in the circumference, wherein a shortest distance between the first end surface A and the second end surface B is the guiding groove configured to accommodate the guidepost. The shortest distance is for example at least 5 cm, and more preferably at least more than 10 cm (~4 inches).
The standard guideposts used today have 8’’ (20,32 cm) outer diameter (OD), but also OD = 5’’ (12,7cm) and OD = 14’’ (35,56cm) are used. However, the invention is not limited to accommodate guideposts of these specific outer diameter sizes and may in principle be used together with any guidepost used in subsea guiding and or aligning operations, including non-circular guideposts.
The guide element assist in installation and retrieval of the first subsea structure onto and off guideposts on a second subsea structure. The guide element is adapted to cooperate with the guidepost during the installation and retrieval of the first subsea structure. Alternatively, the second subsea structure with guideposts may be installed onto the first subsea structure. In this aspect, the second subsea structure may be lowered upside/down onto the first subsea structure.
In an aspect of the first subsea structure, a transverse cross section of the guide element is open curved, e.g. open circular, open oval. In other words, an inner surface of the guiding groove may form a curved or multisided shape. This means that the shape of the guide element, when seen in a transverse cross-section, may have any of these shapes, with a guiding groove configured to accommodate a guidepost. In other words, the guide element is not a guidepipe restricting relative lateral movement or angular displacement of the guidepost relative the guide element.
According to an aspect, the guide element may form a part cylindrical element or has a cross section as an open polygonal or square.
In an aspect of the first subsea structure, a transverse cross section of the guide element may be open two-sided or open polygonal. This means that the guide element may be formed of two sides, connected in a corner, or three or more sides connected in corners between neighboring sides. The guiding groove is then formed by the two longitudinal end sides not connected with neighboring sides.
In an aspect of the first subsea structure, the guide element may have complementary shape with the guidepost. This implies that if the guidepost has a circular cylindrical shape, the guide element may have a similar circular cylindrical shape. Alternatively, if the guidepost has a quadratic shape, the guide element may have a corresponding quadratic shape.
In two different aspect of the first subsea structure, the guiding groove may be directed outwards or inwards from a center axis of the first subsea structure. In other words, the guiding grooves may face away from or towards a center point on the first subsea structure.
In a first of the two aspects, the guide element may be connected to the supporting part in a way such that the guiding groove points outwards from a center of the first subsea structure. In this aspect, the guiding groove in each of the guide elements, is oriented outwards in different radial directions, such that the guide elements together form a full circumference of guiding and aligning of the guide post(s). In a second of the two aspects, the guiding groove may be directed inwards towards a center of the first subsea structure. In this aspect, the guiding groove, in each of the guide elements, is oriented inwards in towards a center and in different radial directions, such that the guide elements together form a full circumference of guiding and aligning of the guide post(s).
In an aspect, each guiding groove may provide guiding for a guide post in less than 270 degrees of a circle or in less than 180 degrees of a circle.
In an aspect, the guide elements on the first subsea structure is configured and positioned such that the guiding grooves of the guide elements are facing in different directions around a 360-degree circumference.
In an aspect, the first subsea structure may comprise at least two guide elements, wherein the at least two guide elements together are configured to guide and align in 360 degrees radial orientation. The size of the guide elements does not have to be equal and one guide element may be able to guide over a larger number of degrees than the other guide elements, however, at least one of the guide elements is preferable able to both guide and align relative a guideposts such as to ensure proper installation of the first subsea structure and the second subsea structure. Furthermore, if using two guide elements, both guide elements are configured such that each can guide at least 180 degrees and further that they may overlap such that they together are able to guide in 360 degrees in the transverse direction of the guide element. If using three guide elements, each guide element may be able to guide at least 120 degrees, wherein the three guide elements can overlap and together guide 360 degrees in the transverse direction of the guide element. It is of course possible to have more than three guide elements, such as four, five, six, seven, eight or more guide elements, whatever is required in the specific project. The number of guide elements may be dependent on the number of guideposts and possibly be of the same number as the number of guideposts, however it is possible to have fewer and more guide elements than guideposts.
In an aspect, the first subsea structure may comprise a guidefunnel section in an extension of the guide element, wherein a guiding area of the guidefunnel increases in a distance away from the guide element. This means that the guiding area in the guidefunnel section is larger in a radial extent than the guide element. It is not necessary to provide all guide elements with guidefunnel section, thus e.g. one or two of the guide elements may be provided with guidefunnel sections to ensure proper guiding and aligning wherein one, two, three or more of the guide elements may not have this guidefunnel section. Reducing the number of guide elements having guidefunnel sections will result in less total weight, but has to be considered in relation to requirement of guiding and aligning.
The guidefunnel may extend around the whole circumference and may have similar shape as the guide element. In this alternative, the guidefunnel section may, in order to simplify insertion and removal of a guide wire, comprise a slot extending along the whole or full axial length of the guidefunnel section.
Alternatively, the guidefunnel may extend along only a portion of a full circumference (i.e. the guidefunnel section extends less than 360 degrees along an imaginary circumference).
The guidefunnel section may have similar shape as the guide element. Furthermore, an opening in the guidefunnel section may have similar shape and size as the guding groove of the guide element to accommodate the guidepost. Alternatively, the guidefunnel sections may have different size of the opening towards the guidepost than the guiding groove in the guide element.
In an aspect, the guidefunnel section may comprise a guide ring for passage of guide wire to assist in mating with the second subsea structure.
The guide ring may be movable between an open position where the guide ring is adapted to receive or accommodate a guidepost in a radial direction thereof, and a closed position where the guide ring is adapted to prevent movement of a guidepost in a radial direction thereof.
In an alternative, and instead of or in addition to the guide ring, the guidefunnel section may have a slot extending along the axial length, through which slot a guide wire may pass into and out of the funnel. In the aspect of having a slot, the guidefunnel section is preferably extending along the full circumference, or close to the full circumference.
The invention relates to an assembly comprising a first subsea structure as defined above and a second subsea structure comprising at least one guidepost.
In an aspect of the assembly, the first subsea structure may comprise two or four guide elements and the second subsea structure may comprise two or four guideposts, respectively.
In an aspect of the assembly, the guide element and the guidepost may have complementary shapes.
In an aspect, it is described a method of mating a first subsea structure with a second subsea structure, the first subsea structure comprises a supporting part supporting a guide element, the guide element has a guiding groove in its circumference configured to accommodate a guidepost, wherein the method comprises the steps of:
- lowering the first subsea structure towards the second subsea structure, the second subsea structure being pre-installed subsea at a certain depth,
- when the first subsea structure is lowered to the depth of the second subsea structure, aligning the guide element of the first subsea structure with a guidepost on the second subsea structure, and
- lowering and mating the first subsea structure with the second subsea structure by allowing an angular displacement of the guide element relative the guidepost.
In another aspect, it is described a method of mating a first subsea structure with a second subsea structure, the first subsea structure comprises a supporting part which supports a guide element, the guide element has a guiding groove in its circumference configured to accommodate the guidepost, wherein the method comprises the steps of:
- lowering the second subsea structure towards the first subsea structure, the first subsea structure being pre-installed subsea at a certain depth,
- when the second subsea structure is lowered to the depth of the first subsea structure, aligning the guide element of the first subsea structure with a guidepost on the second subsea structure, and
- lowering and mating the second subsea structure with the first subsea structure by allowing an angular displacement of the guide element relative the guidepost.
Furthermore, the features described in relation to the first and second subsea structures, is also applicable for use with the methods, and vice versa.
In an aspect where the guide element comprises two sides, the guide element comprises a corner section, from which corner section two straight or curved plate sections extend forming the guiding groove.
Thus, in all of the embodiments of the invention, in that the guiding groove, i.e. the longitudinal opening, is configured to accommodate the guidepost, angular and/or lateral movement of the guidepost relative the guide element is allowed as well as the weight on the first subsea structure is significantly reduced, thereby saving cost.
These and other characteristics of the invention will be clear from the following description of a preferential form of embodiment, given as a non-restrictive example, with reference to the attached drawings wherein;
Brief description of the drawings
Fig. 1 shows a prior art subsea structure with four guidepipes and a guidefunnel at the end of each guidepipe;
Fig. 2 shows a first subsea structure with guide elements;
Fig. 3 shows details of a lower part of the first subsea structure with guide elements directed outwards;
Figs. 4A – 4G show different alternatives of the transverse cross-section of the guide element;
Fig. 5 shows details of a lower part of the first subsea structure with guide elements directed inwards and an alternative supporting part compared to Figs. 2 and 3;
Fig. 6 shows an embodiment where the first subsea structure is pre-installed and the second subsea structure is lowered down onto the first subsea structure with the guideposts oriented downwardly;
Detailed description of a preferred embodiment
Fig. 1 shows a prior art subsea structure with four guidepipes 10 and a guidefunnel 11 at the end of each guidepipe.
Figs. 2 and 3 shows a first subsea structure 1 according to the invention. The first subsea structure 1 comprises a supporting part having a connector interface, e.g. a connector ring, 12 in a center portion of the first subsea structure 1 and
a number of support arms 13 extending outwards from the connector interface 12 towards separate guide elements 2 in each outer corner of the first subsea structure 1. The guide elements 2 are connected to an outer frame structure 14, which outer frame structure are formed by beams or longitudinal elements connected between neighboring guide elements 2. The guide elements 2 in Figs. 2 and 3 are disclosed as two sides connected forming a corner section, and with guide elements 2 directed outwards relative a center axis 7, or center point, of the first subsea structure 1. The separate guide elements 2 extending mainly parallel relative other guide elements 2, and to a distance away from the supporting part 13, 14.
A guidefunnel section 11 is arranged in an extension of each of the guide elements 2. The guiding area of the guidefunnel section 11 increases in a distance away from the guide element 2. This means that the guiding area of the guidefunnel section 11 is larger in a radial extent than the guide element 2. In the Figures, all of the guide elements 2 have guidefunnel sections 11, however this is not necessary. For example, one or two of the guide elements 2 may be provided with guidefunnel sections 11 to ensure proper guiding and aligning wherein one, two, three or more of the guide elements 2 may not have this guidefunnel section 11. Reducing the number of guide elements 2 having guidefunnel sections 11 will result in less total weight, but has to be considered in relation to the requirement of guiding and aligning.
The guidefunnel section 11 is disclosed as extending a similar portion of a circumference as the guide element 2, however it may extend around the whole circumference and may have similar or vary in shape relative the guide element 2. If the guidefunnel section 11 extends a full circumference, it may, in order to simplify insertion and removal of a guide wire, comprise a slot (not shown) extending along the whole or full axial length of the guidefunnel section.
The guidefunnel section may have similar shape as the guide element. Furthermore, the guidefunnel section may have similar opening with regards to shape and size as the guiding groove 4 of the guide element 2 to accommodate the guidepost 5.
Alternatively, the guidefunnel sections may have different size of the opening towards the guidepost than the guiding groove, i.e. longitudinal opening, in the guide element.
The guidefunnel section 11 may comprise a guide ring for passage of guide wire to assist in mating with the second subsea structure. The guide ring is movable between an open position where the guide ring is adapted to receive a guidepost in a radial direction thereof and a closed position where the guide ring is adapted to prevent movement of a guidepost in a radial direction thereof.
A second subsea structure 20 (see Fig. 1) is pre-installed subsea at a certain depth and is provided with guideposts 5 for cooperation with the guide elements 2 on the first subsea structure 1 to ensure proper guiding and aligning between the first and second subsea structures 1, 20.
It is clear from the Figure that the guiding groove 4 of the guide element is configured for accommodating the guidepost 5 and allow angular displacement or lateral movement between the guidepost 5 and the guide element 2 during connection or mating of the first and second subsea structures 1, 20.
During normal operations, the first subsea structure 1 is lowered down onto the second structure 20 in a substantially axial direction. However, it is also possible to lower the second subsea structure 20 onto the first subsea structure (this is disclosed in Fig. 6).
In operation, the steps of mating the first subsea structure 1 with the second subsea structure 20, where the first subsea structure 1 comprises a supporting part supporting a guide element 2, and the guide element 2 has a guiding groove 4 in its circumference configured to accommodate a guidepost 5 on the second subsea structure 20, may comprise the steps of:
- lowering the first subsea structure 1 towards the second subsea structure 20, the second subsea structure 20 being pre-installed subsea at a certain depth,
- when the first subsea structure 1 is lowered to the depth of the second subsea structure 20, aligning the guide element 2 of the first subsea structure 1 with a guidepost 5 on the second subsea structure 20, and
- lowering and mating the first subsea structure 1 with the second subsea structure 20 by allowing an angular displacement of the guide element 2 relative the guidepost 5.
Figs. 4A – 4F show different alternatives of the transverse cross-section of the guide element. In all of the different alternatives, the cross-section is seen from directly above (or directly below). Figs. 4A, 4B, 4C and 4F are examples of guide elements 2 having a transverse cross section which is open curved, e.g. open circular, open oval. Figs. 4D, 4E and 4F are examples of guide elements 2 having a transverse cross section which is open two-sided or open polygonal.
Fig. 4A shows a guide element 2 having a semi-circular cross-section 2’’, where the size of the guiding groove 4, i.e. longitudinal opening 4, is equal to the inner diameter of the semi-circle 2’’.
Fig. 4B shows a guide element 2 semi-elliptical or horseshoe-shaped cross-section 2’, where the size of the guiding groove 4 may be equal to, or somewhat shorter than, a shortest distance between two diagonal opposite inner ends of the semiellipse or horseshoe.
Fig. 4C shows a guide element 2 having an arched or domed cross-section 2’’, and having a guiding groove 4.
Fig. 4D shows a guide element 2 having a V-shaped cross-section 2’, comprising two sides 2’ connected in a corner section 2’’’, and having a guiding groove 4.
Fig. 4E shows a guide element 2 having a U-shape or semi-trapezoidal corss-section 2’, comprising three sides 2’ where neighboring sides are connected in corner sections 2’’’, and having a guiding groove 4.
Fig. 4F shows a guide element 2 having two arched or domed 2’’ sides connected in a corner section 2’’’, forming a curved V-shaped cross-section, and having a guiding groove 4.
Fig. 5 shows details of a lower part of the first subsea structure 1 with guide elements 3, directed inwards, i.e. the guiding grooves 4 are directed inwards toward a center point or center axis 7 of the first subsea structure. In Fig.5, the support arms 13’ extend outwards to an outer frame structure 14’, to which outer frame structure 14’ the separate guide elements 2 are connected. As is clear from Fig. 5, the guideposts 5 are received on the inside of the guide elements 3. Guidefunnel sections 11 are disclosed, however these are not necessarily required and depends on the specific requirements in different projects.
Fig. 6 shows an aspect where the first subsea structure 1 is pre-installed and the second subsea structure 20 is lowered down onto the first subsea structure 1 with the guideposts 5 oriented downwardly.
In operation of mating the second subsea structure 20 onto the first subsea structure 1, where the first subsea structure 1 comprises a supporting part which supports a guide element 2, the guide element 2 has a guiding groove 4 in its circumference configured to accommodate the guidepost 5 on the second subsea structure 20, wherein the method comprises the steps of:
- lowering the second subsea structure 20 towards the first subsea structure 1, the first subsea structure 1 being pre-installed subsea at a certain depth,
- when the second subsea structure 20 is lowered to the depth of the first subsea structure 1, aligning the guide element 2 of the first subsea structure 1 with a guidepost 5 on the second subsea structure 20, and
- lowering and mating the second subsea structure 20 with the first subsea structure 1 by allowing an angular displacement of the guide element 2 relative the guidepost 5.
In a preferred embodiments, the guide elements 2 are such configured that they are adapted to guide and align in 360 degrees radial orientation of the guidepost 5 relative the guide elements 2, or at least close to 360 degrees.
The invention is herein described in non-limiting embodiments. A person skilled in the art will understand that there may be made alterations and modifications to the embodiments that are within the scope of the invention as described in the attached claims.
Claims (9)
1. A first subsea structure for mating with a second subsea structure,
the first subsea structure comprises:
- a supporting part (14, 13) which supports at least two guide elements (2), the guide elements extending mainly parallel from each other and to a distance away from the supporting part,
- each guide element (2) being configured for axial guiding and aligning with a guide post (5) on the second subsea structure and wherein the first subsea structure is characterized in that the guide elements (2) are formed with a guiding groove (4) extending in the longitudinal direction of the guide element (2), and
- the guiding groove (4) extending at least partly along a length of the guide element (2), and wherein
the guiding groove (4) is configured to accommodate the guidepost.
2. The first subsea structure according to claim 1, wherein the guiding grooves (4) are facing away from or towards a center point on the first subsea structure.
3. The first subsea structure according to any of the preceding claims, wherein each guiding groove (4) provide guiding for a guide post (5) in less than 270 degrees of a circle or in less than 180 degrees of a circle.
4. The first subsea structure according to any of the proceeding claims, wherein an inner surface of the guiding groove (4) forms a curved or multisided shape.
5. The first subsea structure according to any of the proceeding claims, wherein the guide element (2) forms a part cylindrical element or has a cross section as an open polygonal or square.
6. The first subsea structure according to any of the proceeding claims, wherein the guide elements (2) on the first subsea structure is configured and positioned such that the guiding grooves (4) of the guide elements (2) are facing in different directions around a 360-degree circumference.
7. The first subsea structure according to any of the preceding claims, wherein the first subsea structure comprises a guidefunnel section in an extension of the guide element (2), wherein a guiding area of the guidefunnel increases in a distance away from the guide element (2).
8. The first subsea structure according to claim 7, wherein the guidefunnel section comprises a guide ring for passage of guide wire to assist in mating with the second subsea structure.
9. Assembly comprising a first subsea structure according to any of the preceding claims 1-8 and a second subsea structure comprising at least two guideposts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20162035A NO343099B1 (en) | 2016-12-21 | 2016-12-21 | First subsea structure with guiding groove for mating with second subsea structure, and assembly comprising the first and second subsea structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20162035A NO343099B1 (en) | 2016-12-21 | 2016-12-21 | First subsea structure with guiding groove for mating with second subsea structure, and assembly comprising the first and second subsea structures |
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| Publication Number | Publication Date |
|---|---|
| NO20162035A1 NO20162035A1 (en) | 2018-06-22 |
| NO343099B1 true NO343099B1 (en) | 2018-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| NO20162035A NO343099B1 (en) | 2016-12-21 | 2016-12-21 | First subsea structure with guiding groove for mating with second subsea structure, and assembly comprising the first and second subsea structures |
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| Country | Link |
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| NO (1) | NO343099B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832124A (en) * | 1985-01-03 | 1989-05-23 | Texaco Ltd | Subsea well head template |
| US20140341656A1 (en) * | 2013-05-17 | 2014-11-20 | Aker Subsea Limited | Self-aligning subsea structures |
-
2016
- 2016-12-21 NO NO20162035A patent/NO343099B1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832124A (en) * | 1985-01-03 | 1989-05-23 | Texaco Ltd | Subsea well head template |
| US20140341656A1 (en) * | 2013-05-17 | 2014-11-20 | Aker Subsea Limited | Self-aligning subsea structures |
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| Publication number | Publication date |
|---|---|
| NO20162035A1 (en) | 2018-06-22 |
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