A type of offshore well workover platform

Abstract

This utility model provides an offshore well workover platform, including an offshore workover platform, a cantilever workover platform, a coiled tubing reel, an injection port, and a lifting frame. The cantilever workover platform is equipped with a Y-axis sliding mechanism and a rotary table. The Y-axis sliding mechanism includes a Y-axis guide rail and a Y-axis hydraulic cylinder. The bottom of the lifting frame is mounted on the Y-axis guide rail, and the Y-axis hydraulic cylinder drives the lifting frame to reciprocate along the Y-axis guide rail. The coiled tubing reel is mounted on the rotary table, and the rotary table drives the tubing reel to rotate reciprocally. An X-axis moving mechanism is provided between the cantilever workover platform and the offshore workover platform. The X-axis moving mechanism includes an X-axis guide rail and an X-axis hydraulic cylinder. This utility model aims to provide an offshore well workover platform suitable for well workover operations. The lifting frame can move along the Y-axis, and the cantilever workover platform can move along the X-axis, enabling rapid adjustment to the optimal operating state based on wellhead conditions, thereby improving well workover efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of well workover operation platforms, and in particular relates to an operation platform for offshore well workover. Background Technology

[0002] Well intervention refers to various maintenance, repair, and production enhancement operations performed on producing oil and gas wells. Drilling and well intervention work accounts for a large proportion of the total cost of oilfield production; therefore, reducing the cost of this work will significantly improve the economic efficiency of oilfield production. To date, most well intervention work has been carried out by large and expensive drilling vessels or semi-submersible drilling platforms. Using specialized vessels for well intervention can significantly reduce well intervention costs, allowing the drilling rig to focus again on drilling operations.

[0003] A cantilever workover rig, also known as an oil well intervention cantilever, is typically equipped with a tool handling crane for auxiliary cable and coiled tubing tool changes. The wellhead assembly and coiled tubing reel equipment are crucial for efficiency. Wellhead assemblies usually include auxiliary support devices (also known as lifting frames). These lifting frames often lack adjustable injection head position and height, or only offer partial adjustment and are time-consuming and labor-intensive to operate. Furthermore, this type of support device has poor adaptability to different wellhead conditions. Addressing these issues by quickly adjusting to the optimal operating state based on wellhead conditions is essential for improving workover efficiency. Utility Model Content

[0004] In view of this, the present invention aims to propose an offshore well workover platform suitable for well workover operations. The lifting frame can move along the Y-axis and the cantilever workover platform can move along the X-axis, which can be quickly adjusted to the optimal working state according to the wellhead conditions to improve well workover efficiency.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A work platform for offshore well workover includes an offshore work platform, a cantilever workover platform, a coiled tubing reel, an injection port, and a lifting frame. The offshore work platform is equipped with a cantilever workover platform, and the coiled tubing reel and lifting frame are installed on the cantilever workover platform. An injection port is installed on the lifting frame, and the tubing wound on the coiled tubing reel is connected to the injection port via a gooseneck. The cantilever workover rig is equipped with a Y-axis sliding mechanism and a rotary table. The Y-axis sliding mechanism includes a Y-axis guide rail and a Y-axis hydraulic cylinder. The bottom of the lifting frame is mounted on the Y-axis guide rail, and the Y-axis hydraulic cylinder drives the lifting frame to reciprocate along the Y-axis guide rail. The coiled tubing reel is mounted on the rotary table, and the rotary table drives the tubing reel to rotate reciprocally. The Y-axis guide rail is arranged along the Y-axis direction, and the rotary table is located on one side of the Y-axis guide rail and is correspondingly arranged with the lifting frame. An X-axis moving mechanism is provided between the cantilever workover platform and the offshore work platform. The X-axis moving mechanism includes an X-axis guide rail and an X-axis hydraulic cylinder. The bottom of the cantilever workover platform is mounted on the X-axis guide rail, and the X-axis hydraulic cylinder drives the cantilever workover platform to reciprocate along the X-axis guide rail.

[0006] Furthermore, the lifting frame includes a base frame, a lifting mechanism, and a worktable. The injection port is located on the worktable, and a lifting mechanism is provided between the base frame and the worktable. The lifting mechanism is used to drive the worktable to reciprocate in the vertical direction. The lifting mechanism includes four electric lifting rods.

[0007] Furthermore, it also includes a winch, the lifting frame being U-shaped in general, with its interior forming a U-shaped space; the winch is installed within the U-shaped space.

[0008] Furthermore, the Y-axis hydraulic cylinder drives the lifting frame to slide a distance of 4 to 6 meters along the Y-axis guide rail.

[0009] Furthermore, the X-axis hydraulic cylinder drives the cantilever workover platform to reciprocate 15 to 19 meters along the X-axis guide rail.

[0010] Furthermore, the X-axis hydraulic cylinder includes two push-pull hydraulic cylinders arranged mirror-to-each other. The bottom of the cantilever well-working platform is provided with a front pedal leg and a rear pedal leg. The two push-pull hydraulic cylinders are arranged between the front pedal leg and the rear pedal leg. The extension rods of the two push-pull hydraulic cylinders are respectively connected to the front pedal leg and the rear pedal leg.

[0011] Furthermore, the Y-axis hydraulic cylinder includes a push-pull hydraulic cylinder, which is arranged along the Y-axis guide rail. The four corners of the bottom of the lifting frame are respectively provided with pedals, and the telescopic rod of the Y-axis hydraulic cylinder is connected to one of the pedals.

[0012] Compared with existing technologies, the offshore well workover platform described in this utility model has the following advantages: A marine well workover platform, through a Y-axis sliding mechanism and an X-axis moving mechanism, enables the lifting frame to move along the Y-axis and the cantilever workover platform to move along the X-axis. During workover operations, it supports movement along both the X-axis and Y-axis within the well. A coiled tubing reel is mounted on a rotary table to adjust the coil angle during lateral sliding within the well. The lifting mechanism of the lifting frame allows for adjustment of the injection head height, thus enabling adjustable injection head position and height. It can quickly adjust to the optimal operating state based on wellhead conditions, improving workover efficiency. This solves the problems of lifting frames that cannot adjust the injection head position and height, or that only have partial adjustment functions and are time-consuming and labor-intensive to operate. Attached Figure Description

[0013] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the offshore well repair platform described in this embodiment of the utility model; Figure 2 This is a schematic diagram of the lifting frame and its connection structure as described in an embodiment of the present utility model; Figure 3 This is a top view schematic diagram of the cantilever well-working platform structure described in this embodiment of the utility model; Figure 4 This is a schematic diagram of the X-axis direction moving mechanism structure described in an embodiment of the present invention; Figure 5 This is a schematic diagram of the Y-axis moving mechanism described in an embodiment of the present invention.

[0014] Explanation of reference numerals in the attached figures: 100-Offshore work platform; 200-Cantilever workover platform; 300-X-axis moving mechanism; 1-Rotary table; 2-Coiled tubing reel; 3-Tubing; 4-Gooseneck; 5-Injection port; 6-Windlock; 7-Lifting frame; 8-Y-axis sliding mechanism; 10-Y-axis guide rail; 11-Rear kick leg; 12-Push-pull cylinder; 13-Hydraulic system; 15-Front kick leg; 16-X-axis guide rail; 17-Kick leg; 18-Y-axis cylinder; 20-Base frame; 22-Workbench; 21-Electric lifting rod; 23-U-shaped space. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, an offshore well workover platform includes an offshore workover platform 100, a cantilever workover rig 200, a coiled tubing reel 2, an injection port 5, and a lifting frame 7. The offshore workover platform 100 is equipped with the cantilever workover rig 200, which in turn is equipped with the coiled tubing reel 2 and the lifting frame 7. The injection port 5 is mounted on the lifting frame 7. The tubing 3 wound on the coiled tubing reel 2 is connected to the injection port 5 via a gooseneck 4. like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the cantilever workover platform 200 is equipped with a Y-axis sliding mechanism 8 and a rotary table 1. The Y-axis sliding mechanism 8 includes a Y-axis guide rail 10 and a Y-axis hydraulic cylinder 18. The bottom of the lifting frame 7 is mounted on the Y-axis guide rail 10, and the Y-axis hydraulic cylinder 18 drives the lifting frame 7 to reciprocate along the Y-axis guide rail 10. The coiled tubing reel 2 is mounted on the rotary table 1, and the rotary table 1 drives the tubing reel to rotate reciprocally. The Y-axis guide rail 10 is arranged along the Y-axis direction, and the rotary table 1 is located on one side of the Y-axis guide rail 10 and is correspondingly arranged with the lifting frame 7. Preferably, the rotary table is a hydraulic rotary table. The Y-axis guide rail 10 includes two rails, which are arranged parallel to each other.

[0018] like Figure 1 Figures and Figure 4 As shown, an X-axis moving mechanism 300 is provided between the cantilever workover platform 200 and the offshore work platform 100. The X-axis moving mechanism 300 includes an X-axis guide rail 16 and an X-axis hydraulic cylinder. The bottom of the cantilever workover platform 200 is mounted on the X-axis guide rail 16, and the X-axis hydraulic cylinder drives the cantilever workover platform 200 to reciprocate along the X-axis guide rail 16.

[0019] A marine well workover platform is equipped with a Y-axis sliding mechanism 8 and an X-axis moving mechanism 300, enabling the cantilever workover platform 200 to move along the X-axis and the lifting frame 7 to move along the Y-axis. During workover operations, it supports movement along both the X-axis and Y-axis within the well, improving workover efficiency. Driven by hydraulic cylinders, the movement is smooth and fast. A coiled tubing reel is mounted on a rotary table 1 to adjust the coil angle during lateral sliding within the well. The lifting frame can move along the Y-axis, and the cantilever workover platform can move along the X-axis, allowing for rapid adjustment to the optimal working state based on wellhead conditions, further enhancing workover efficiency. Movement can be performed with the equipment fully installed, coiled tubing inserted, and cables connected.

[0020] like Figure 2 As shown, the lifting frame 7 includes a base frame 20, a lifting mechanism, and a worktable 22. The injection port is located on the worktable. A lifting mechanism is installed between the base frame 20 and the worktable 22. The lifting mechanism drives the worktable 22 to reciprocate vertically. The lifting mechanism includes four electric lifting rods 21. The height of the injection head can be adjusted via the lifting mechanism of the lifting frame. The lifting frame 7 is generally U-shaped, forming a U-shaped space inside. The winch 6 is installed within the U-shaped space 23. The lifting frame has a built-in insert winch for assisting modification operations and improving well repair efficiency.

[0021] In this preferred embodiment, the Y-axis hydraulic cylinder drives the lifting frame to slide a distance of 4 to 6 meters along the Y-axis guide rail 10. The X-axis hydraulic cylinder drives the cantilever workover platform 200 to reciprocate 15 to 19 meters along the X-axis guide rail.

[0022] like Figure 4 As shown, the X-axis hydraulic cylinder includes two mutually mirror-arranged push-pull hydraulic cylinders 12. A front pedal leg 15 and a rear pedal leg 11 are located at the bottom of the cantilever workover platform 200. The two push-pull hydraulic cylinders 12 are positioned between the front pedal leg 15 and the rear pedal leg 11. The extension rods of the two push-pull hydraulic cylinders 12 are respectively connected to the front pedal leg 15 and the rear pedal leg 11. A hydraulic system 13 for driving the push-pull hydraulic cylinders 12 is provided between the two push-pull hydraulic cylinders 12. When moving in the X-axis direction, the cantilever workover platform 200 moves. The two push-pull hydraulic cylinders 12 work together to improve load-bearing capacity, increase work efficiency, and make the movement faster and smoother. More preferably, two mutually mirror-arranged push-pull hydraulic cylinders 12 are respectively arranged on both sides of the bottom of the cantilever workover platform 200 to further improve load-bearing capacity.

[0023] like Figure 5 As shown, the Y-axis hydraulic cylinder 18 includes a push-pull hydraulic cylinder, which is arranged along the Y-axis guide rail 10. The four corners of the bottom of the lifting frame 7 are respectively provided with pedals 17, and the telescopic rod of the Y-axis hydraulic cylinder 18 is connected to one of the pedals 17. The Y-axis movement is a convenient movement, that is, it drives the lifting frame 7 and the injection port 5 to move.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A work platform for offshore well workover, comprising an offshore work platform (100), a cantilever workover platform (200), a coiled tubing reel (2), an injection port (5), and a lifting frame (7), wherein the offshore work platform (100) is provided with the cantilever workover platform (200), the coiled tubing reel (2) and the lifting frame (7) are provided on the cantilever workover platform (200), the injection port (5) is provided on the lifting frame (7), and the tubing (3) wound on the coiled tubing reel (2) is connected to the injection port (5) via a gooseneck (4), characterized in that: The cantilever workover platform (200) is equipped with a Y-axis sliding mechanism (8) and a rotary table (1). The Y-axis sliding mechanism (8) includes a Y-axis guide rail (10) and a Y-axis hydraulic cylinder (18). The bottom of the lifting frame (7) is mounted on the Y-axis guide rail (10). The Y-axis hydraulic cylinder (18) drives the lifting frame (7) to move back and forth along the Y-axis guide rail (10). The coiled tubing reel (2) is set on the rotary table (1). The rotary table (1) drives the tubing reel to rotate back and forth. The Y-axis guide rail (10) is set along the Y-axis direction. The rotary table (1) is located on one side of the Y-axis guide rail (10) and is set corresponding to the lifting frame (7). An X-axis moving mechanism (300) is provided between the cantilever workover platform (200) and the offshore work platform (100). The X-axis moving mechanism (300) includes an X-axis guide rail (16) and an X-axis hydraulic cylinder. The bottom of the cantilever workover platform (200) is mounted on the X-axis guide rail (16). The X-axis hydraulic cylinder drives the cantilever workover platform (200) to reciprocate along the X-axis guide rail (16).

2. The offshore well workover platform according to claim 1, characterized in that: The lifting frame (7) includes a base frame (20), a lifting mechanism and a worktable (22). The injection port is set on the worktable. A lifting mechanism is set between the base frame (20) and the worktable (22). The lifting mechanism is used to drive the worktable (22) to move back and forth in the vertical direction. The lifting mechanism includes four electric lifting rods (21).

3. The offshore well workover platform according to claim 1, characterized in that: It also includes a winch (6), the lifting frame (7) is U-shaped in general, and its interior forms a U-shaped space; the winch (6) is installed in the U-shaped space (23).

4. The offshore well workover platform according to claim 1, characterized in that: The Y-axis hydraulic cylinder drives the lifting frame to slide a distance of 4 to 6 meters along the Y-axis guide rail (10).

5. The offshore well workover platform according to claim 1, characterized in that: The X-axis hydraulic cylinder drives the cantilever workover platform (200) to reciprocate 15 to 19 meters along the X-axis guide rail.

6. The offshore well workover platform according to claim 1, characterized in that: The X-axis hydraulic cylinder includes two push-pull hydraulic cylinders (12) arranged in mirror orientation. The bottom of the cantilever well repair platform (200) is provided with a front pedal leg (15) and a rear pedal leg (11). The two push-pull hydraulic cylinders (12) are arranged between the front pedal leg (15) and the rear pedal leg (11). The telescopic rods of the two push-pull hydraulic cylinders (12) are respectively connected to the front pedal leg (15) and the rear pedal leg (11).

7. The offshore well workover platform according to claim 1, characterized in that: The Y-axis hydraulic cylinder (18) includes a push-pull hydraulic cylinder, which is set along the Y-axis guide rail (10). The four corners of the bottom of the lifting frame (7) are respectively provided with pedals (17), and the telescopic rod of the Y-axis hydraulic cylinder (18) is connected to one of the pedals (17).

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