Method for quick removal of grouting lines of a jacket

Abstract

The application discloses a kind of methods for quickly removing grouting pipeline of jacket, comprising the following steps: S1, grouting pipeline is set to upper and lower segmented structure and is connected by quick connector, the connecting point of two grouting pipelines is set underwater;S2, the grouting pipeline of lower segment is fixedly connected to jacket and is set to permanent structure, the grouting pipeline of upper segment is fixed using welding on water surface, and is temporarily fixed using the mode that cable gear penetrates butt joint hole under water surface;S3, when grouting is completed, the fixed connection of the grouting pipeline of upper segment on water surface is released, diver disconnects the quick connector, and the separation of two grouting pipelines is realized;S4, the cable gear is extracted, and the quick removal of temporary fixation of the grouting pipeline of lower segment is completed.The application adopts pipeline quick removal structure and technology, can optimize traditional jacket construction operation process, save floating crane work ship, improve the efficiency of offshore platform installation operation, effectively save the cost of offshore platform construction.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore construction, and in particular to a method for quickly dismantling a jacket grouting pipeline. Background Art

[0002] With the development of my country's offshore oil and gas industry, increasing the speed of oilfield platform construction and development and optimizing engineering development efficiency and economy are the keys to reducing costs and increasing efficiency in offshore oil and gas development. This is especially true for the offshore installation process, which occupies a large number of ships and equipment resources and is a high-cost cycle for the entire oilfield construction. For traditional pile-foundation jacket platforms, the grouting pipeline is fixed to the side of the jacket. During the normal installation process, after grouting is completed, divers need to go into the water to cut the grouting pipeline. Since underwater operations are affected by tides, seabed visibility, water depth and water pressure, the cutting efficiency is low. At the same time, during this operation, the main operation vessel and on-site auxiliary support vessels must be on standby or provide support, consuming a lot of manpower, material resources, and equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for quickly removing a jacket grouting pipeline. By adopting a pipeline rapid removal structure and technology, the traditional jacket construction operation process can be optimized, floating crane operation vessels can be saved, the efficiency of offshore platform installation operations can be improved, and the cost of offshore platform construction can be effectively saved.

[0004] In order to achieve the purpose of the present invention, the present invention provides a method for quickly removing a jacket grouting pipeline, comprising the following steps:

[0005] S1. The grouting pipeline is configured as an upper and lower segmented structure and connected via a quick connector, with the connection point of the two segments of the grouting pipeline being set underwater;

[0006] S2. The grouting pipeline described in the lower section is fixedly connected to the jacket and is set as a permanent structure. The grouting pipeline described in the upper section is fixed by welding above the water surface and temporarily fixed by rigging through the docking holes below the water surface.

[0007] S3. After the grouting is completed, the fixed connection of the upper section of the grouting pipeline on the water surface is released, and a diver goes into the water to disconnect the quick connector, thereby separating the two sections of the grouting pipeline;

[0008] S4. Pull out the rigging to complete the quick removal of the temporary fixation of the grouting pipeline in the lower section.

[0009] As a preferred technical solution of the present invention, the grouting pipeline described in the lower section is set as a permanent structure and is not removed after the grouting is completed; the grouting pipeline described in the upper section needs to be removed.

[0010] As a preferred technical solution of the present invention, the rigging is passed through the docking hole in such a manner that several groups of temporary fixing points are provided on the side end of the grouting pipeline and the side end of the conductor frame, and each group of temporary fixing points includes three lifting ears, two of which are fixedly connected to the side end of the conductor frame, and a gap is left between the two lifting ears; the other lifting ear is fixedly connected to the side end of the grouting pipeline. During installation, the lifting ear fixedly connected to the side end of the grouting pipeline is inserted between the two lifting ears fixedly connected to the side end of the conductor frame, and the three lifting ears are provided with lifting ear holes, and the apertures of the lifting ear holes are the same and the centers of the circles are aligned.

[0011] As a preferred technical solution of the present invention, the rigging passes through the ear holes of the three ear lugs to form a temporary fixation.

[0012] As a preferred technical solution of the present invention, after the rigging passes through several groups of temporary fixing points in sequence, the rigging is turned back around the return crossbar on the jacket and fixed to the top end of the jacket.

[0013] As a preferred technical solution of the present invention, after grouting is completed, the rigging is pulled out from the several groups of temporary fixing points, and the rigging releases the constraints of the three lifting ears, so that the grouting pipeline can be separated from the conductor frame, completing the rapid removal of the grouting pipeline.

[0014] Compared with the prior art, the present invention provides a method for quickly removing a jacket grouting pipeline, which has the following beneficial effects:

[0015] The present invention utilizes the characteristics of the wire rope rigging being flexible at its longer end and rigid at its shorter end. A method is designed to secure the grouting pipeline underwater by passing the rigging through a butt hole, and to guide the removal control portion to the top of the jacket. This achieves the characteristics of both above-water operations and underwater removal. Furthermore, the grouting pipeline is divided into two sections: the section that does not need to be removed in deep water is fixed by welding, while the section that needs to be removed in shallow water is softly connected by passing the rigging through a butt hole. A quick connector is used between the two sections to facilitate removal by divers. This effectively avoids the need for divers to cut the grouting pipeline underwater after the jacket is installed, reduces the offshore support and occupation time of ship resources, optimizes the offshore process flow, shortens the overall offshore project construction period, and improves operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention;

[0017] Figure 2 This invention Figure 1 Schematic diagram of the structure at A in the middle;

[0018] Figure 3 This invention Figure 1Schematic diagram of the structure at B in the middle;

[0019] Figure 4 This invention Figure 1 Schematic diagram of the structure at C in the middle;

[0020] Figure 5 It is a schematic structural diagram of the quick connector of the present invention.

[0021] 1 is the grouting pipeline, 2 is the quick connector, 3 is the jacket, 4 is the rigging, 5 is the temporary fixing point, 6 is the lifting lug, and 7 is the return crossbar. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1-4 The embodiment of the present invention provides a method for quickly removing a jacket grouting pipeline, comprising the following steps:

[0024] S1. The grouting pipeline 1 is configured as an upper and lower segmented structure and connected via a quick connector 2, with the connection point of the two segments of the grouting pipeline 1 being set underwater;

[0025] S2. The grouting pipeline 1 in the lower section is fixedly connected to the jacket 3 and is set as a permanent structure. The grouting pipeline 1 in the upper section is fixed by welding above the water surface and temporarily fixed by rigging 4 through the docking holes below the water surface.

[0026] S3. After the grouting is completed, the fixed connection of the upper section of the grouting pipeline 1 on the water surface is released, and a diver goes into the water to disconnect the quick connector 2, thereby separating the two sections of the grouting pipeline 1;

[0027] S4, pulling out the rigging 4 to complete the quick removal of the temporary fixation of the lower section of the grouting pipeline 1.

[0028] In one embodiment of the present invention, in step S1, the grouting pipeline 1 in the lower section is set as a permanent structure and is not removed after the grouting is completed; the grouting pipeline 1 in the upper section needs to be removed.

[0029] In one embodiment of the present invention, in step S2, the rigging 4 is passed through the docking hole in such a manner that a plurality of groups of temporary fixing points 5 are provided on the side ends of the grouting pipeline 1 and the jacket 3, and each group of temporary fixing points 5 includes three lifting ears 6, two of the lifting ears 6 are fixedly connected to the side ends of the jacket 3, and a gap is left between the two lifting ears 6; the other lifting ear 6 is fixedly connected to the side end of the grouting pipeline 1, and during installation, the lifting ear 6 fixedly connected to the side end of the grouting pipeline 1 is just inserted between the two lifting ears 6 fixedly connected to the side end of the jacket 3, and the three lifting ears 6 are all provided with lifting ear holes, and the apertures of the lifting ear holes are the same and the centers of the circles are aligned.

[0030] In one embodiment of the present invention, the rigging 4 passes through the three lifting ears 6 to form a temporary fixation.

[0031] In one embodiment of the present invention, after the rigging 4 passes through several groups of temporary fixing points 5 in sequence, the rigging 4 is turned back around the return crossbar 7 on the jacket 3 and fixed to the top end of the jacket 3 .

[0032] In one embodiment of the present invention, in step S4, after grouting is completed, the rigging 4 is pulled out from the plurality of temporary fixing points 5, and the rigging 4 releases the constraints of the three lifting ears 6, so that the grouting pipeline 1 can be separated from the jacket 3, completing the rapid dismantling of the grouting pipeline 1.

[0033] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for quickly dismantling a jacket grouting pipeline, characterized in that: The following steps are involved: S1, setting the grouting pipeline (1) into an upper and lower segmented structure and connecting them via a quick connector (2), with the connection point of the two segments of the grouting pipeline (1) being set underwater; S2, the grouting pipeline (1) in the lower section is fixedly connected to the jacket (3) and is set as a permanent structure, and the grouting pipeline (1) in the upper section is fixed by welding on the water surface and temporarily fixed by rigging (4) through the docking hole under the water surface; S3. After the grouting is completed, the fixed connection of the upper section of the grouting pipeline (1) on the water surface is released, and a diver goes into the water to disconnect the quick connector (2), thereby separating the two sections of the grouting pipeline (1); S4, pulling out the rigging (4) to complete the quick removal of the temporary fixation of the grouting pipeline (1) in the lower section; The specific method of inserting the rigging (4) into the docking hole is as follows: The side ends of the grouting pipeline (1) and the side ends of the jacket (3) are provided with a plurality of temporary fixing points (5), each of which comprises three lifting lugs (6); two of the lifting lugs (6) are fixedly connected to the side ends of the jacket (3), and a gap is left between the two lifting lugs (6); the other lifting lug (6) is fixedly connected to the side end of the grouting pipeline (1); during installation, the lifting lug (6) fixedly connected to the side end of the grouting pipeline (1) is inserted into the jacket (3) The three lifting ears (6) are fixedly connected to the side ends of the conductor frame (3), and the three lifting ears (6) are all provided with lifting ear holes, and the diameters of the lifting ear holes are the same and the centers of the circles are aligned; the rigging (4) passes through the lifting ear holes of the three lifting ears (6) to form a temporary fixation; after the rigging (4) passes through several groups of temporary fixing points (5) in sequence, the rigging (4) is folded back around the return cross bar (7) on the conductor frame (3) and fixed to the top end of the conductor frame (3).

2. A method for rapid removal of a jacket grouting pipeline according to claim 1, characterized in that: In step S1, the grouting pipeline (1) in the lower section is set as a permanent structure and is not removed after the grouting is completed; the grouting pipeline (1) in the upper section needs to be removed.

3. The method for quickly removing a jacket grouting pipeline according to claim 1, characterized in that: In step S4, after the grouting is completed, the rigging (4) is pulled out from the plurality of temporary fixing points (5), and the rigging (4) releases the constraints of the three lifting lugs (6), so that the grouting pipeline (1) and the conductor frame (3) can be separated, thereby completing the rapid removal of the grouting pipeline (1).

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