US20180163518A1

US20180163518A1 - Subsea template architecture

Info

Publication number: US20180163518A1
Application number: US15/813,376
Authority: US
Inventors: Matthew Michael Reznicek; Ian Robert Pringle; Vegard Bryhni
Original assignee: OneSubsea IP UK Ltd
Current assignee: OneSubsea IP UK Ltd
Priority date: 2016-12-12
Filing date: 2017-11-15
Publication date: 2018-06-14
Also published as: EP3333358B1; EP3333358A1

Abstract

A subsea template manifold and method, of which the subsea template manifold includes a first suction compartment configured to be at least partially embedded in a sea floor, a second suction compartment configured to be at least partially embedded in the sea floor, and a bridging element extending between and connected to the first and second suction compartments. The bridging element is configured to be at least partially embedded in the sea floor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent Application Ser. No. 62/432,968, filed on Dec. 12, 2016, which is incorporated herein by reference in its entirety.

BACKGROUND

Subsea templates are large subsea structures that support or otherwise house wellheads, Christmas trees, and manifolds. A subsea manifold is made up of pipes and valves and is designed to transfer hydrocarbons from wellheads into a pipeline. The manifold is mounted onto the template, e.g., at the seafloor.
Generally, the subsea template includes a foundation that is at least partially embedded within the seafloor. More particularly, the foundation may include several pilings, which may be suction compartments (also referred to as suction anchors), e.g., positioned at the corners of the structure. The suction compartments have an open lower end, which is lowered, and then forced, into the seafloor, thereby anchoring the subsea template manifold in place.
The remainder of the structure is built up from and supported by these suction compartments. A variety of truss-structures, support beams, etc., are connected to the suction compartments to provide the subsea template with sufficient stability and rigidity to allow for safe and effective operation of the subsea devices associated therewith. This can call for a large amount of material, which can be expensive in itself, and also can be expensive and time-consuming to build onto the suction compartments.

SUMMARY

Embodiments of the present disclosure may provide a subsea template manifold including a first suction compartment configured to be at least partially embedded in a sea floor, a second suction compartment configured to be at least partially embedded in the sea floor, and a bridging element extending between and connected to the first and second suction compartments. The bridging element is configured to be at least partially embedded in the sea floor.
Embodiments of the disclosure may also provide a method for supporting a subsea manifold at a sea floor including embedding at least a portion of a suction compartment of a subsea template manifold into a seabed, and embedding at least a portion a bridging element of the subsea template into the seabed. The bridging element extends between and is connected to the first and second suction compartments.
Embodiments of the disclosure may provide an apparatus for supporting a subsea well system, including a first suction anchor configured to be at least partially embedded in a sea floor, a second suction anchor configured to be at least partially embedded in the sea floor, and a bridging element extending between and connected to the first and second suction anchors. The bridging element is configured to be at least partially embedded in the sea floor.
This summary is provided to introduce a selection of concepts that are further described below in the detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present teachings and together with the description, serve to explain the principles of the present teachings. In the figures:

FIG. 1 illustrates a perspective view of a subsea template, according to an embodiment.

FIG. 2 illustrates a perspective view of the template, according to another embodiment.

FIG. 3 illustrates a perspective view of the template, according to yet another embodiment.

FIG. 4 illustrates a schematic plan view of four wellhead devices, which may be configured to be landed on and/or otherwise connected to the four wells, respectively, according to an embodiment.

FIG. 5 illustrates a flowchart of a method for supporting a subsea manifold at a sea floor, according to an embodiment.

DETAILED DESCRIPTION

Reference will now be made in detail to specific embodiments illustrated in the accompanying drawings and figures. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that embodiments may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and networks have not been described in detail so as not to unnecessarily obscure aspects of the embodiments.
It will also be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first object could be termed a second object, and, similarly, a second object could be termed a first object, without departing from the scope of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description and the appended claims, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and/or” as used herein refers to and encompasses any and possible combinations of one or more of the associated listed items. It will be further understood that the terms “includes,” “including,” “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof. Further, as used herein, the term “if” may be construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context.
FIG. 1 illustrates a perspective view of a subsea template 100, according to an embodiment. In some embodiments, the subsea template 100 may be configured to support a manifold for transferring process fluids (e.g., hydrocarbons) from one or more wells to a pipeline. The template 100 may include one or more suction compartments (four shown: 102, 104, 106, 108). The suction compartments 102-108 may be cylindrical pilings, which may be configured to be positioned at least partially below the surface of the seafloor (i.e., “embedded” at least partially in the seafloor). The suction compartments 102-108 may be hollow cylinders, which may be open at the bottom. This may allow for the suction compartments 102-108 to sink into the seafloor upon landing thereon during installation. Suction may then be applied to the upper end of the suction compartments 102-108 so as to drive the suction compartments 102-108 farther into, e.g., entirely into, the seafloor.
The template 100 may also include a top plate 110, which may extend laterally (e.g., in a generally horizontal, parallel to the seafloor direction) between the suction compartments 102-108. Further, the top plate 110 may be coupled to the upper end of the suction compartments 102-108, and thus may be configured to be positioned slightly above or at the seafloor when the suction compartments 102-108 are installed in the seafloor. In some embodiments, the top plate 110 may be provided by several segments, one extending between each pair of adjacent suction compartments 102-108 as shown, but in other embodiments, may be a single plate.
One or more bridging elements 112, 114, 116, 118 may extend between and be coupled to the suction compartments 102-108. For example, respective ones of the bridging elements 112-118 may extend between two of the suction compartments 102-108. In some embodiments, the bridging elements 112-118 may be coupled to the top plate 110, but in other embodiments, the bridging elements 112-118 and the top plate 110 may be separate.
The bridging elements 112-118 may be or include relatively thin, vertically-oriented (i.e., with the thin side facing vertically) plates. In a specific embodiment, each of the bridging elements 112-118 may include two such plates 120, 122, one nearer to the center of the template 100 than the other, with the plates 120, 122 being offset from and extending generally parallel to one another. Between the plates 120, 122 of at least one of the bridging elements (e.g., elements 112 and 116), one or more wellheads 200, 202, 204, 206 may be positioned. Each wellhead 200-206 may include connectors for connecting to wellhead equipment (e.g., Christmas trees, blowout preventers, etc.), which may be or include one or more vertically-oriented posts. Within each wellhead 200-206, a washout sleeve 214, 216, 218, 220 may be positioned, e.g., between the two plates 120, 122. The washout sleeves 214-220 may be connected to the top plate 110 and/or one of the bridging elements 112-118. Further, the washout sleeves 214-220 may be connected to wells, and may represent the upper end of such wells (accordingly, in some cases herein, reference numbers 214-220 may be described as pointing to wells). Well- support brackets 250, 252 may be connect to the bridging elements 112-118 and the corresponding washout sleeves/wells 214-220.
Further, the bridging elements 112, 116 may include the well- support brackets 250, 252. The well- support brackets 250, 252 may couple to the wells 214-220 (e.g., washout sleeves/wellheads 270 thereof). The well- support brackets 250, 252 may further couple to one of the plates 120, 122 and/or to one of the suction containers 102-108.
The well- support brackets 250, 252 may be vertically-oriented plates, brackets, struts, etc. In some embodiments, the well- support brackets 250, 252 may extend downwards, and may be generally triangular, e.g., so as to facilitate extending and embedding the brackets 250, 252 into the seafloor. In other embodiments, the well-support brackets 250 may extend between the plates 120, 122, as shown, and extend upwards therefrom, such that the brackets 250, 252 may, in some cases, not be embedded in the seafloor during installation. The well- support brackets 250, 252 may thus provide lateral support and rigidity for the wells 214-220.
FIG. 2 illustrates a perspective view of the template 100, according to another embodiment. In this embodiment, the template 100 omits the fourth suction chamber 108, and thus provides a generally triangular footprint. It will be appreciated that embodiments including five or more suction chambers 108, and any number of shapes for the footprint, are contemplated herein. Further, in this embodiment, the bridging elements 112-116 (bridging element 118 may be omitted) may be generally constructed the same as one another, and may each include well- support brackets 250, 252, for positioning a well therebetween (well not shown).
FIG. 3 illustrates a perspective view of the template 100, according to yet another embodiment. As shown, the plates 120, 122 of the bridging elements 112-118 may each be connected to one of the wells 214-220. For example, the plates 120, 122 may each provide one of the well- support brackets 250, 252, such that the plates 120, 122 (and thus the bridging elements 112-118) are connected to the suction compartments 102-108 via the connection with the wells 214-220.
With the wells 214-220 positioned (e.g., one each) between the suction compartments 102-108, the wellhead equipment may be similarly clocked at 90 degree angles. For example, FIG. 4 illustrates a schematic plan view of four wellhead devices 400, 402, 404, 406, which may be configured to be landed on and/or otherwise connected to the four wells 214-220, respectively, according to an embodiment. In some embodiments, the four wellhead devices 400-406 may each be a Christmas tree. Accordingly, the four wellhead devices 400-406 may each include a remote operated vehicle (ROV) panel 408, 410, 412, 414. So as to allow for each of the ROV panels 408-414 to face outwards, each of the wellhead devices 400-406 may be rotated 90 degrees from the adjacent wellhead device 400-406. In some situations, this may allow for a more compact template 100.
With continuing reference to FIGS. 1-4, FIG. 5 illustrates a flowchart of a method 500 for supporting a subsea manifold, using a subsea template such as the template 100, at a sea floor, according to an embodiment. The method 500 may include embedding at least a portion of a first suction compartment 102-108 and a second suction compartment 102-108 of a subsea template manifold 100 into a seabed, as at 502. The method 500 may further include embedding at least a portion a bridging element 112-118 of the subsea template 100 into the seabed, as at 504. The bridging element 112-118 extends between and is connected to the first and second suction 102-108 compartments.
In some embodiments, embedding the at least a portion of the first and second suction compartments 102-108 at 502 and embedding at least a portion of the bridging element 112-118 at 504 occur at least partially at the same time (i.e., simultaneously or overlapping in time).
In some embodiments, the bridging element 112-118 includes one or more vertically-oriented plates extending laterally between the first and second suction compartments 102-108 and being fixed thereto. In such embodiments, embedding the at least a portion of the bridging element 112-118 at 504 may include embedding at least a portion of the plates 120, 122 into the seabed.
In some embodiments, the method 500 may include positioning, at 506, a first Christmas tree 700, a second Christmas tree 702, a third Christmas tree 704, and a fourth Christmas tree 706, on the subsea template 100 and in communication with the wells 214-220. Each of the first, second, third, and fourth Christmas trees 700-706 faces in a different direction. For example, each of the Christmas trees 700-706 may be rotated 90 degrees in orientation from the adjacent Christmas trees 700-706.
As used herein, the terms “inner” and “outer”; “up” and “down”; “upper” and “lower”; “upward” and “downward”; “above” and “below”; “inward” and “outward”; and other like terms as used herein refer to relative positions to one another and are not intended to denote a particular direction or spatial orientation. The terms “couple,” “coupled,” “connect,” “connection,” “connected,” “in connection with,” and “connecting” refer to “in direct connection with” or “in connection with via one or more intermediate elements or members.”
The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. Moreover, the order in which the elements of the methods described herein are illustrate and described may be re-arranged, and/or two or more elements may occur simultaneously. The embodiments were chosen and described in order to best explain the principals of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

What is claimed is:

1. A subsea template manifold, comprising:

a first suction compartment configured to be at least partially embedded in a sea floor;

a second suction compartment configured to be at least partially embedded in the sea floor; and

a bridging element extending between and connected to the first and second suction compartments, wherein the bridging element is configured to be at least partially embedded in the sea floor.

2. The subsea template manifold of claim 1, wherein the bridging element comprises one or more vertically-oriented plates extending laterally between the first and second suction compartments and being fixed thereto.

3. The subsea template manifold of claim 1, wherein the bridging element comprises a first plate and a second plate, the first and second plates each being coupled to the first and second suction compartments and extending generally parallel to one another, the subsea template manifold being configured to connect to a well between the first and second plates.

4. The subsea template manifold of claim 1, wherein the bridging element comprises a first section and a second section, the first section being connected to the first suction compartment, and the second section being connected to the second suction compartment, the subsea template manifold further comprising a washout sleeve connected to the first and second sections, such that the first and second sections are connected to one another via the washout sleeve.

5. The subsea template manifold of claim 1, further comprising a well-support bracket and a washout sleeve positioned between the first and second suction compartments and coupled to the bridging element, wherein the well-support bracket is coupled to the washout sleeve, and the first suction compartment, the bridging element, or both, and wherein the well-support bracket is configured to be at least partially embedded below the sea floor.

6. The subsea template manifold of claim 1, further comprising a top plate coupled to the first suction compartment, the second suction compartment, and the support bracket, wherein the top plate is configured to be above or on the sea floor and to support one more seafloor devices.

7. The subsea template manifold of claim 1, wherein the bridging element comprises a first bridging element, the subsea template manifold further comprising:

a third suction compartment configured to be at least partially embedded beneath the sea floor;

a fourth suction compartment configured to be at least partially embedded beneath the sea floor;

a second bridging element extending between and connected to the second and third suction compartments;

a third bridging element extending between and connected to the third and fourth suction compartments;

a fourth bridging element extending between and connected to the first and fourth suction compartments;

a plurality of washout sleeves, wherein a respective one of the plurality of washout sleeves connected to each of the first, second, third, and fourth bridging elements.

8. The subsea template manifold of claim 7, further comprising a first Christmas tree, a second Christmas tree, a third Christmas tree, and a fourth Christmas tree, each facing in a different direction and each being coupled to one of the plurality of washout sleeves.

9. A method for supporting a subsea manifold at a sea floor, comprising:

embedding at least a portion of a suction compartment of a subsea template manifold into a seabed; and

embedding at least a portion a bridging element of the subsea template into the seabed, wherein the bridging element extends between and is connected to the first and second suction compartments.

10. The method of claim 9, wherein embedding the at least a portion of the suction compartment and the embedding at least a portion of the bridging element occur at least partially at the same time.

11. The method of claim 9, wherein the bridging element comprises one or more vertically-oriented plates extending laterally between the first and second suction compartments and being fixed thereto, wherein embedding the at least a portion of the bridging element comprises embedding at least a portion of the plates into the seabed.

12. The method of claim 9, further comprising positioning a first Christmas tree, a second Christmas tree, a third Christmas tree, and a fourth Christmas tree, on the subsea template and in communication with the wells, wherein each of the first, second, third, and fourth Christmas trees faces in a different direction.

13. The method of claim 12, wherein the first, second, third, and fourth Christmas trees face in four different directions, 90 degrees offset from one another.

15. An apparatus for supporting a subsea well system, comprising:

a first suction anchor configured to be at least partially embedded in a sea floor;

a second suction anchor configured to be at least partially embedded in the sea floor; and

a bridging element extending between and connected to the first and second suction anchors, wherein the bridging element is configured to be at least partially embedded in the sea floor.

16. The apparatus of claim 15, wherein the bridging element comprises one or more vertically-oriented plates extending laterally between the first and second suction anchors and being fixed thereto.

17. The apparatus of claim 15, wherein the bridging element comprises a first plate and a second plate, the first and second plates each being coupled to the first and second suction anchors and extending generally parallel to one another, the subsea template manifold being configured to connect to a well between the first and second plates.

18. The apparatus of claim 15, further comprising a top plate coupled to the first suction anchor, the second suction anchor, and the support bracket, wherein the top plate is configured to be above or on the sea floor and to support one more subsea devices.

19. The apparatus of claim 15, wherein the bridging element comprises a first bridging element, the subsea template manifold further comprising:

a third suction anchor configured to be at least partially embedded beneath the sea floor;

a fourth suction anchor configured to be at least partially embedded beneath the sea floor;

a second bridging element extending between and connected to the second and third suction anchors;

a third bridging element extending between and connected to the third and fourth suction anchors;

a fourth bridging element extending between and connected to the first and fourth suction anchors;

a plurality of wellheads, wherein a respective one of the plurality of wellheads is connected to each of the first, second, third, and fourth bridging elements.

20. The apparatus of claim 19, further comprising a first Christmas tree, a second Christmas tree, a third Christmas tree, and a fourth Christmas tree, each facing in a different direction and each being coupled to one of the plurality of wellheads.