Design method of topsides layout for unattended wellhead platform in deepwater chicken eggshell formation

Abstract

The present application relates to a kind of unmanned wellhead platform upper module layout design method of deep water chicken eggshell formation, belong to the field of offshore oil engineering technology, comprising: fire wall is set on the upper portion of unmanned wellhead platform, and the both sides of the module of the upper portion of unmanned wellhead platform are divided into dangerous area and safe area;In the safe area, the first layer electrical room is divided into the left side of the first layer electrical room and the right side of the first layer electrical room;Helicopter deck is arranged above the second layer room;The lower edge of the upper module of unmanned wellhead platform is outwardly convex to form crane area, and crane is arranged in the crane area;By adjusting well slot spacing, production tree is arranged in the lower deck of the module of the wellhead of unmanned wellhead platform, double-layer production tree is improved into single-layer production tree, and upper deck production tree and its cover are cancelled.The present application solves the problem of mutual interference between cantilever beam of drilling ship and module equipment and facilities during drilling ship positioning and drilling operation under the condition of 100-meter water depth chicken eggshell formation.

Description

Technical Field

[0001] This invention belongs to the field of marine oil engineering technology, specifically relating to a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations. Background Technology

[0002] Some seabed soil layers appear hard on the surface, but are actually just a thin "shell," which can be figuratively described as an "eggshell" layer. Piles inserted into this eggshell-like layer may be temporarily stable; however, once the shell breaks, the underlying soft soil layer cannot provide sufficient bearing capacity, and the pile legs are likely to penetrate the "shell" and sink rapidly, posing a "puncture" risk. This could damage the platform, or even cause it to capsize and sink, resulting in huge economic losses.

[0003] Offshore unmanned wellhead platforms generally do not have drilling and workover facilities installed. Instead, drilling and workover operations are carried out by a mobile drilling vessel positioned around the unmanned wellhead platform. This requires that when the modules of the unmanned wellhead platform are operating within the area covered by the drilling vessel, they should avoid interfering with the cantilever beams operating at high altitudes as much as possible.

[0004] However, in deep waters (such as 100 meters deep), coupled with eggshell-like geological formations, drilling vessels are prone to slipping. The climbing height of the drilling vessel is limited by the length of its own legs, and under poor soil conditions, the climbing height is greatly reduced. This places higher demands on the overall layout of the modules of the unmanned wellhead platform, requiring the module height to be limited to a lower level.

[0005] The existing modular layout of the upper part of the unmanned wellhead platform is divided into two sides, one side is the danger zone and the other side is the safety zone. The safety zone of the upper deck includes facilities such as electrical rooms, living quarters, and helicopter deck. Moreover, the safety zone of the upper deck is at a high height. During the assembly of the facilities on the upper deck to complete the modular layout, the crane, the electrical rooms on the second floor and the helicopter deck are prone to interference with the cantilever beam of the drilling vessel operating at high altitude. Summary of the Invention

[0006] To address the aforementioned problems, the purpose of this invention is to provide a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations. This method aims to solve the problem of mutual interference between the cantilever beam of the drilling vessel and the block equipment and facilities when a self-elevating drilling vessel is positioned on an unmanned wellhead platform for drilling operations under eggshell formation conditions at a water depth of 100 meters.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention discloses a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations, including:

[0009] Step A: Install a firewall on the top of the unmanned wellhead platform to divide the two sides of the block on the top of the unmanned wellhead platform into a danger zone and a safe zone. The side where the self-elevating drilling vessel is positioned on the unmanned wellhead platform is designed as the danger zone, and the other side is designed as the safe zone. The wellhead is located in the danger zone. The safe zone is used to set up a first-floor electrical room, a second-floor electrical room, and a helicopter deck.

[0010] Step B: Within the safe zone, the first-floor electrical room is divided into a left-side section and a right-side section. The left-side section is closer to the danger zone, i.e., the west side of the safe zone, while the right-side section is further away from the danger zone, i.e., the east side of the safe zone.

[0011] Step C: Arrange a helicopter deck above the second-floor room, ensuring that the left edge of the helicopter deck does not exceed the outer edge of the left side profile of the second-floor room;

[0012] Step D: A crane area is formed by protruding outward from the lower edge of the upper block of the unmanned wellhead platform. A crane is installed in the crane area to avoid the cantilever beam of the drilling ship.

[0013] Step E: By adjusting the well slot spacing, the production trees are concentrated on the lower deck of the wellhead module of the unmanned wellhead platform, and the double-layer production trees are improved to single-layer production trees, thereby eliminating the upper deck production trees and their cover plates, and further reducing the module height.

[0014] Furthermore, step B also includes: reducing the height of the left side portion of the first-floor electrical room while increasing the length of the right side portion of the first-floor electrical room in the longitudinal direction.

[0015] Specifically, the method for reducing the height of the left side of the first-floor electrical room is to subtract the original two floors of the left side of the first-floor electrical room, and retain the first floor of the left side of the first-floor electrical room.

[0016] Furthermore, in step B, the left side portion and the right side portion of the first-floor electrical room are separated by a safety barrier.

[0017] Specifically, the width of the safety isolation zone is 2.1 meters.

[0018] Specifically, the well slot spacing of the wellhead is 2.4 × 2.3 m.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (I) This invention discloses a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations. Based on the fact that the main areas of interference between the blocks and the drilling vessel's cantilever beam are in higher areas such as the electrical rooms and helicopter deck, this invention optimizes the height of the highest point by rationally setting the number and location of the electrical rooms, arranging the helicopter deck, and optimizing the block layout. This not only ensures a rational structural design for the entire block but also guarantees the feasibility of drilling and well repair operations under eggshell formation conditions at a water depth of 100 meters. This invention overcomes the shortcomings of conventional block layouts and solves the problem of mutual interference between the drilling vessel's cantilever beam and the block equipment and facilities during drilling operations in eggshell formations at a water depth of 100 meters.

[0021] (II) This invention discloses a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations. The wellhead is concentrated on the lower deck, avoiding double-layer wellheads and facilitating the daily operation and management of the wellhead.

[0022] (III) This invention discloses a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations. By partially expanding the block deck in the north-south direction, the rationality of the room layout is ensured, while taking into account the rationality of the spacing between the block working points and the overhang dimensions. Attached Figure Description

[0023] Figure 1 This is a top view of one layer of the upper block of the unmanned wellhead platform provided in an embodiment of the present invention;

[0024] Figure 2 This is a top view of the second layer of the upper module of the unmanned wellhead platform provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the spacing between oil well trees provided in an embodiment of the present invention. Detailed Implementation

[0026] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0027] This invention breaks away from the conventional modular overall layout approach, redesigning the layout for areas prone to interference with the drilling vessel's cantilever beam. Overcoming the shortcomings of conventional modular layouts, it provides a design method for the upper modular layout of an unmanned wellhead platform in deep-water eggshell formations. This avoids mutual interference between the drilling vessel's cantilever beam and the modular equipment and facilities during drilling operations, thus solving the problem of mutual interference between the drilling vessel's cantilever beam and the modular equipment and facilities when a self-elevating drilling vessel is positioned on an unmanned wellhead platform for drilling in eggshell formations at a water depth of 100 meters.

[0028] Example 1

[0029] Example 1 provides a design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations, including the following steps:

[0030] Step A: Install a firewall on the upper part of the unmanned wellhead platform, dividing the two sides of the upper block of the unmanned wellhead platform into a danger zone and a safe zone. The side where the jack-up drilling rig is positioned on the unmanned wellhead platform is designed as the danger zone, and the other side as the safe zone. Figure 1 As shown;

[0031] The wellhead is located in the danger zone, and the safety zone is used to house a first-floor electrical room, a second-floor electrical room, and a helicopter deck.

[0032] Step B: Set up the electrical room

[0033] Within the safety zone, the first-floor electrical room is divided into a left-side section and a right-side section. The left-side section is closer to the danger zone, i.e., the west side of the safety zone, while the right-side section is further away from the danger zone, i.e., the east side of the safety zone.

[0034] To avoid interference between the left side of the first-floor electrical room and the cantilever beam of the drilling vessel, and to ensure that the placement of facilities in the first-floor electrical room is as unobstructed as possible, the height of the left side of the first-floor electrical room is reduced, while the length of the right side of the first-floor electrical room is increased.

[0035] Specifically, the original second floor on the left side of the first electrical room is removed, and the first floor on the left side of the first electrical room is retained.

[0036] To ensure that the higher second-floor electrical room does not overlap with the area covered by the drilling vessel's cantilever beam, the left and right sides of the first-floor electrical room are separated by a safety barrier.

[0037] Specifically, the width of the safety isolation zone is 2.1 meters.

[0038] Step C: Set up the helicopter deck

[0039] A helicopter deck is arranged above the second-floor room, and the left edge of the helicopter deck does not exceed 100 mm of the outer edge of the left side profile of the second-floor room. Figure 2 As shown.

[0040] Step D: A crane area is formed by protruding outward from the lower edge of the upper block of the unmanned wellhead platform. A crane is installed in the crane area to avoid the cantilever beam of the drilling vessel.

[0041] Step E: By adjusting the well slot spacing, the production trees are concentrated on the lower deck of the wellhead module of the unmanned wellhead platform, and the double-layer production trees are improved to single-layer production trees, thereby eliminating the upper deck production trees and their cover plates, and further reducing the module height.

[0042] The existing conventional spacing between oil wells is 1.8m × 2.0m.

[0043] Furthermore, the well slot spacing of the wellhead in the present invention is 2.4 × 2.3 m, as shown below. Figure 3 As shown.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A design method for the upper block layout of an unmanned wellhead platform in deep-water eggshell formations, characterized in that, Comprising Step A: setting a fireproof wall on the upper part of the unmanned wellhead platform to divide the two sides of the module of the upper part of the unmanned wellhead platform into a dangerous area and a safe area, wherein the side of the self-elevating drilling ship on the unmanned wellhead platform is designed as the dangerous area, and the other side is designed as the safe area, the wellhead is located in the dangerous area, and the safe area is used to set a layer of electrical room, a second layer of electrical room and a helicopter deck; Step B: in the safe area, the first layer of electrical room is divided into a left part and a right part, the left part is close to the dangerous area, i.e. the west side of the safe area, and the right part is away from the dangerous area, i.e. the east side of the safe area; Step C: arranging the helicopter deck above the second layer of electrical room, and the left edge of the helicopter deck does not exceed the outer edge of the left contour of the second layer of electrical room; Step D: protruding the lower edge of the upper module of the unmanned wellhead platform outward to form a crane area, and setting a crane in the crane area to avoid the cantilever beam of the drilling ship; Step E: by adjusting the well slot spacing, the Christmas tree is arranged on the lower deck of the module below the wellhead of the unmanned wellhead platform, and the double-layer Christmas tree is improved into a single-layer Christmas tree, so that the upper deck Christmas tree and its cover plate are cancelled, and the height of the module is further reduced; The step B further comprises: reducing the height of the left part of the first layer of electrical room, while increasing the length of the right part of the first layer of electrical room in the length direction; The method for reducing the height of the left part of the first layer of electrical room is: subtracting the original second layer of the left part of the first layer of electrical room, and retaining the first layer of the left part of the first layer of electrical room.

2. The design method of claim 1, wherein In the step B, the left part of the first layer of electrical room and the right part of the first layer of electrical room are separated by a safety isolation belt.

3. The design method of claim 2, wherein The width of the safety isolation belt is 2.1 meters.

4. The design method of claim 1, wherein The well slot spacing of the Christmas tree is 2.4*2.3m.

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