Four-legged unmanned wellhead platform with well slot expansion function

Abstract

The present invention relates to a four-leg unmanned wellhead platform with a well slot expansion function, which includes a jacket, an upper module, and a well area. The upper module is arranged at the top of the jacket, and at least two well areas are respectively arranged at both ends of the upper module. The jacket includes: jacket legs, wellhead protection devices, and a first connection structure; at least four jacket legs enclose a frustum of a pyramid structure with a smaller top and a larger bottom; at least four wellhead protection devices are arranged on both sides of the frustum of the pyramid and enclose a frustum of a pyramid structure with a smaller top and a larger bottom; between at least four jacket legs, between at least four wellhead protection devices, and between the jacket legs and the wellhead protection devices are all connected through the first connection structure; a plurality of vertically arranged well area columns that penetrate the jacket are arranged at the lower end of the well area, and every four adjacent well area columns enclose a cube structure, and each cube structure is a well slot. The present invention meets the space requirements for simultaneous operation of two drilling ships.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction equipment, and more specifically to a four-leg unmanned wellhead platform with well slot expansion function. Background Art

[0002] In the development of Bohai Oilfield, fixed platforms are usually used. Platforms with wellheads and without treatment functions are collectively referred to as wellhead platforms. Wellhead platforms can be divided into three categories according to different drilling and workover methods:

[0003] The first type of platform is equipped with a modular drilling rig for drilling and workover operations. The number of well slots on this type of platform is usually more than 20. Since personnel need to stay on the platform during drilling and workover operations, a living building needs to be set up on the platform. The living building occupies a large area and has a large load. At the same time, due to the large area and large load of the modular drilling rig, the area of the upper module of the platform increases, and the overall steel consumption increases. This type of platform is usually an eight-leg platform.

[0004] The second type of platform is equipped with a workover rig, uses a drilling ship for drilling, and uses the platform workover rig for workover. Due to the coverage problem of the drilling ship, the number of well slots on this type of platform is usually less than or equal to 20, and can reach 40 considering two-side positioning, but two-side simultaneous drilling cannot be carried out, and there is also a problem that the workover frequency cannot be met. Since personnel need to stay on the platform during workover operations, a living building also needs to be set up on the platform, but the living building is smaller than that of the first type of platform. The area occupied by the workover rig is smaller than that of the modular drilling rig, and the overall steel consumption is relatively lower than that of the first type of platform. If this type of platform wants to carry out drilling operations for adjustment wells, it usually needs to use the form of an external well slot, and the original platform needs to be transformed and checked, and at the same time, offshore transformation and installation costs are generated. This type of platform is usually a four-leg platform.

[0005] The third type of platform is not equipped with any drilling and workover facilities and uses a drilling ship for drilling and workover. Considering the drilling and workover frequency, the number of well slots on this type of platform is usually less than 16, and at most 20. This type of platform does not have an expansion function and cannot carry out drilling operations for adjustment wells, otherwise it will affect the workover operations of the original well slots of the platform. This type of platform is usually also a four-leg platform. Summary of the Invention

[0006] In view of the above problems, the object of the present invention is to provide a four-leg unmanned wellhead platform with well slot expansion function. The platform does not set up a living building, has two wellhead areas, has a well slot expansion function, and the number of well slots can be adjusted within a certain range. Limited by the drilling coverage of the drilling ship, the maximum number of well slots that can be set in a single-side wellhead area of the platform is 20, with a total of 40 well slots. The platform meets the space requirements for simultaneous operation of two drilling ships.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The four-leg unmanned wellhead platform with well slot expansion function described in the present invention includes a jacket, an upper module, and a well area. The upper module is arranged on the top of the jacket, and at least two well areas are respectively arranged at both ends of the upper module. The jacket includes: jacket legs, wellhead protection devices, and a first connection structure. At least four jacket legs enclose a frustum of a pyramid structure with a smaller upper part and a larger lower part. At least four wellhead protection devices are arranged on both sides of the frustum of the pyramid and enclose a frustum of a pyramid structure with a smaller upper part and a larger lower part. Between at least four jacket legs, between at least four wellhead protection devices, and between the jacket legs and the wellhead protection devices are all connected through the first connection structure. At the lower end of the well area, there are several vertically arranged well area columns that penetrate the jacket. Every four adjacent well area columns enclose a cube structure, and each cube structure is a well slot.

[0009] For the four-leg unmanned wellhead platform described above, preferably, there are two well areas, four jacket legs, and four wellhead protection devices.

[0010] For the four-leg unmanned wellhead platform described above, preferably, the first connection structure includes three horizontal layer structures and four vertical structures. The first horizontal layer structure is horizontally arranged at the upper end of the jacket legs, the second horizontal layer structure is horizontally arranged in the middle of the jacket legs, and the third horizontal layer structure is horizontally arranged at the lower end of the jacket legs. The three horizontal layer structures connect the four jacket legs and the four wellhead protection devices together in the horizontal direction. The four vertical structures are all arranged between the second horizontal layer structure and the third horizontal layer structure. The first vertical structure is arranged between the two wellhead protection devices on the first side and is used to connect the two wellhead protection devices on this side. The second vertical structure is arranged between the two jacket legs on the first side and is used to connect the two jacket legs on this side. The third vertical structure is arranged between the two jacket legs on the second side and is used to connect the two jacket legs on this side. The fourth vertical structure is arranged between the two wellhead protection devices on the second side and is used to connect the two wellhead protection devices on this side.

[0011] For the four-leg unmanned wellhead platform described above, preferably, the first horizontal layer structure or the second horizontal layer structure or the third horizontal layer structure respectively includes two cross bars, four longitudinal bars, and four diagonal bars. The two cross bars respectively connect the two wellhead protection devices and the two jacket legs on the front and back sides. The four longitudinal bars respectively connect the wellhead protection devices or jacket legs that are opposite on the front and back sides. The four diagonal bars form a diamond support, and the diamond support is located within the square structure formed by the middle two longitudinal bars and the two cross bars.

[0012] For the described four-leg unmanned wellhead platform, preferably, the first vertical structure, or the second vertical structure, or the third vertical structure, or the fourth vertical structure respectively includes two first diagonal braces arranged crosswise. The two first diagonal braces arranged crosswise are disposed between two relatively front and rear wellhead protection devices or two jacket legs, and are used to form a support between the two relatively wellhead protection devices or two jacket legs.

[0013] For the described four-leg unmanned wellhead platform, preferably, the upper module includes at least four connecting legs and a second connecting structure. At least four of the connecting legs enclose a square body structure and correspond to the tops of at least four of the jacket legs; at least four of the connecting legs are connected into one body through the second connecting structure.

[0014] For the described four-leg unmanned wellhead platform, preferably, the number of the connecting legs is four.

[0015] For the described four-leg unmanned wellhead platform, preferably, the second connecting structure mainly consists of two layers of horizontal frames and second diagonal braces. The two layers of horizontal frames are connected by the second diagonal braces; the horizontal frames are composed of rod bodies arranged vertically and horizontally, and the vertically and horizontally arranged rod bodies avoid the well area.

[0016] For the described four-leg unmanned wellhead platform, preferably, the number of the well slots is 40, and they are evenly distributed at both ends of the upper module.

[0017] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0018] (1) By providing two well areas and wellhead protection devices, the present invention greatly increases the number of well slots of the platform without drill and workover facilities on the premise of not increasing the number of jacket legs and ensuring the safety of the platform and the protection of the wellhead.

[0019] (2) By increasing the north-south spacing of the jacket legs and providing two well areas, the present invention can meet the space requirements for simultaneous on-site operations on both sides of the drilling ship, improving the operation efficiency.

[0020] (3) The present invention can be used for oilfield development with a maximum demand for the number of well slots of 40, and is also applicable to oilfield development with a demand for the number of well slots of less than 40 on the platform. The present invention has scalability and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0023] Figure 2 is a three-dimensional structure schematic diagram of the jacket of the present invention;

[0024] Figure 3 is a bottom view structure schematic diagram of the jacket of the present invention;

[0025] Figure 4 is a side view structure schematic diagram of the jacket of the present invention;

[0026] Figure 5 is a three-dimensional structure schematic diagram of the upper module of the present invention;

[0027] Figure 6 is a top view structure schematic diagram of the upper module of the present invention.

[0028] The reference signs in the drawings are shown as follows:

[0029] 1 - Jacket; 101 - Jacket leg; 102 - Wellhead protection device; 103 - First connection structure; 1031 - Horizontal layer structure; 1032 - Vertical structure; 2 - Upper module; 201 - Connection leg; 202 - Second connection structure; 3 - Well area; 301 - Well area column. Detailed implementation manners

[0030] Hereinafter, the exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0031] The present invention provides a four - leg unmanned wellhead platform with a well slot expansion function. The maximum number of well slots of this type of platform can be 40. The platform is not provided with any drilling and workover facilities and living facilities, and the platform has the functional requirement of simultaneous operation in two well areas, thereby improving the operation efficiency.

[0032] As Figure 1 shown, the four - leg unmanned wellhead platform with a well slot expansion function provided by the present invention includes a jacket 1, an upper module 2, and a well area 3. The upper module 2 is arranged on the top of the jacket, and two well areas 3 are arranged at both ends of the upper module 2.

[0033] Among them, as Figure 2As shown in the figure, the jacket 1 includes: jacket legs 101, a wellhead protection device 102, and a first connection structure 103; the four jacket legs 101 enclose a frustum-shaped structure with a smaller upper part and a larger lower part; the four wellhead protection devices 102 are arranged on both sides of the first frustum and enclose a frustum-shaped structure with a smaller upper part and a larger lower part; the four jacket legs 101 are connected to each other, the four wellhead protection devices 102 are connected to each other, and the jacket legs 101 and the wellhead protection devices 102 are connected through the first connection structure 103; several vertically arranged wellhead area columns 301 that penetrate the jacket 1 are provided at the lower ends of the two wellhead areas 3, and every four adjacent wellhead area columns 301 enclose a cubic structure, and each cubic structure is a well slot.

[0034] In the above embodiment, preferably, as Figure 2 shown, the first connection structure 103 includes three horizontal layer structures 1031 and four vertical structures 1032. The first horizontal layer structure 1031 is horizontally arranged at the upper ends of the jacket legs 101, the second horizontal layer structure 1031 is horizontally arranged in the middle of the jacket legs 101, and the third horizontal layer structure 1031 is horizontally arranged at the lower ends of the jacket legs 101. The three horizontal layer structures 1031 connect the four jacket legs 101 and the four wellhead protection devices 102 together in the horizontal direction; the four vertical structures 1032 are all arranged between the second horizontal layer structure 1031 and the third horizontal layer structure 1031. The first vertical structure 1032 is arranged between the two wellhead protection devices 102 on the first side and is used to connect the two wellhead protection devices 102 on this side together; the second vertical structure 1032 is arranged between the two jacket legs 101 on the first side and is used to connect the two jacket legs 101 on this side together; the third vertical structure 1032 is arranged between the two jacket legs 101 on the second side and is used to connect the two jacket legs 101 on this side together; the fourth vertical structure 1032 is arranged between the two wellhead protection devices 102 on the second side and is used to connect the two wellhead protection devices 102 on this side together.

[0035] In the above embodiment, preferably, as Figure 3 shown, the first horizontal layer structure 1031, the second horizontal layer structure 1031, or the third horizontal layer structure 1031 has the same structure and respectively includes two cross bars, four longitudinal bars, and four diagonal bars. The two cross bars connect the two wellhead protection devices 102 and the two jacket legs 101 on the front and back sides together; the four longitudinal bars connect the wellhead protection devices 102 or the jacket legs 101 on the opposite front and back sides together; the four diagonal bars form a diamond-shaped support, and the diamond-shaped support is located within the square structure formed by the middle two longitudinal bars and the two cross bars.

[0036] In the above embodiment, preferably, as Figure 4As shown, the first vertical structure 1032, or the second vertical structure 1032, or the third vertical structure 1032, or the fourth vertical structure 1032 respectively includes two first diagonal braces arranged crosswise. The two first diagonal braces arranged crosswise are disposed between two relatively front and rear wellhead protection devices 102 or two jacket legs 101, and are used to form a support between the two relatively wellhead protection devices 102 or two jacket legs 101.

[0037] In the above embodiment, preferably, as Figure 5 shown, the upper module 2 includes at least four connecting legs 201 and a second connecting structure 202. The four connecting legs 201 enclose a square body structure and correspond to the tops of the four jacket legs 101; the four connecting legs 201 are connected to each other into an integral body through the second connecting structure 202.

[0038] In the above embodiment, preferably, as Figure 5 and Figure 6 shown, the second connecting structure 202 mainly consists of two layers of horizontal frames and second diagonal braces. The two layers of horizontal frames are connected by the second diagonal braces; the horizontal frames are composed of rods arranged vertically and horizontally, and the rods arranged vertically and horizontally avoid the well area 3.

[0039] In the above embodiment, preferably, the number of well slots is at least 40, and they are evenly distributed at both ends of the upper module 2.

[0040] After the present invention is manufactured on land, the jacket legs 101 and the wellhead protection devices 102 are connected through the first connecting structure 103 to form an integral body, and are transported to the oilfield sea area by a barge and hoisted in place by a floating crane ship. The floating crane ship first hoists the jacket 1 in place, drives 4 pile foundations into the jacket legs 101, and then drives the wellhead protection device fixing structure into the outer round tubes of the wellhead protection devices 102. The pile foundations and the wellhead protection device fixing structures are both round tube structures, and their diameters are smaller than the diameters of the outer round tubes of the jacket legs 101 or the wellhead protection devices 102. After driving the above structures, cement slurry is poured into the gaps between the above structures and the outer round tubes of the jacket legs 101 or the wellhead protection devices 102. After the cement slurry solidifies, the installation of the jacket is completed. At this time, if the upper structure has been manufactured, it can continue to be installed, or installed later. At this time, the drilling ship can be located outside the two wellhead protection devices 102 at the same time to carry out drilling operations. After the upper module structure is manufactured, it is also transported to the oilfield sea area by a barge and hoisted in place by a floating crane ship, and the connection between the upper module structure and the jacket is formed through the connecting legs 201. After the connection is completed, welding is carried out to make the upper module structure and the jacket form an integral body. After the installation is completed, the drilling ship continues to be located at the original position to carry out drilling or subsequent workover operations.

[0041] The present invention provides a new type of platform. The maximum number of well slots of this type of platform can be 40. No drilling and workover facilities or living facilities are provided on the platform, reducing the scale of the upper module of the platform. At the same time, the number of wellheads on the platform is maximized, so as to achieve the application within a certain range of wellheads, improving the application range and scalability of the platform; and the platform has the function and space requirements for simultaneous operation in two well areas, improving the operation efficiency.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A four-legged unmanned wellhead platform with a well slot expansion function, characterized in that, It includes a jacket, an upper module, and a wellhead area. The upper module is arranged on the top of the jacket, and at least two wellhead areas are respectively arranged at both ends of the upper module. The jacket includes: jacket legs, wellhead protection devices, and a first connection structure. At least four jacket legs enclose a frustum of a pyramid structure that is smaller at the top and larger at the bottom. At least four wellhead protection devices are arranged on both sides of the frustum of the pyramid and enclose a frustum of a pyramid structure that is smaller at the top and larger at the bottom. Between at least four jacket legs, between at least four wellhead protection devices, and between the jacket legs and the wellhead protection devices are all connected by the first connection structure. At the lower end of the wellhead area, there are a number of vertically arranged wellhead area columns that penetrate the jacket. Every four adjacent wellhead area columns enclose a cube structure, and each cube structure is a well slot. There are two wellhead areas, four jacket legs, and four wellhead protection devices. The first connection structure includes three horizontal layer structures and four vertical structures. The first horizontal layer structure is horizontally arranged at the upper end of the jacket legs, the second horizontal layer structure is horizontally arranged in the middle of the jacket legs, and the third horizontal layer structure is horizontally arranged at the lower end of the jacket legs. The three horizontal layer structures connect the four jacket legs and the four wellhead protection devices together in the horizontal direction. The four vertical structures are all arranged between the second horizontal layer structure and the third horizontal layer structure. The first vertical structure is arranged between the two wellhead protection devices on the first side and is used to connect the two wellhead protection devices on this side together; the second vertical structure is arranged between the two jacket legs on the first side and is used to connect the two jacket legs on this side together; the third vertical structure is arranged between the two jacket legs on the second side and is used to connect the two jacket legs on this side together; the fourth vertical structure is arranged between the two wellhead protection devices on the second side and is used to connect the two wellhead protection devices on this side together. The first horizontal layer structure or the second horizontal layer structure or the third horizontal layer structure respectively includes two crossbars, four longitudinal bars, and four diagonal bars. The two crossbars respectively connect the two wellhead protection devices and the two jacket legs on the front and back sides together; the four longitudinal bars respectively connect the wellhead protection devices or jacket legs that are opposite on the front and back sides together; the four diagonal bars form a diamond support, and the diamond support is located within the square structure formed by the two middle longitudinal bars and the two crossbars. The number of well slots is 40, and they are evenly distributed at both ends of the upper module.

2. The four-legged unmanned wellhead platform according to claim 1, wherein The first vertical structure or the second vertical structure or the third vertical structure or the fourth vertical structure respectively includes two first diagonal braces arranged in a cross shape. The two first diagonal braces arranged in a cross shape are arranged between two wellhead protection devices or two jacket legs that are opposite front and back, and are used to form a support between the two opposite wellhead protection devices or two jacket legs.

3. The four-legged unmanned wellhead platform according to claim 1, characterized in that, The upper module includes at least four connecting legs and a second connection structure. At least four connecting legs enclose a cube structure and correspond to the tops of at least four jacket legs. At least four of the connecting legs are connected into a whole through a second connecting structure.

4. The four-legged unmanned wellhead platform according to claim 3, characterized in that, There are four connecting legs.

5. The four-legged unmanned wellhead platform according to claim 3, wherein, The second connecting structure is mainly composed of two layers of horizontal frames and second diagonal braces, and the two layers of horizontal frames are connected by the second diagonal braces; The horizontal frame is composed of rods that crisscross each other, and the crisscrossing rods avoid the wellhead area.

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