A method of underwater grouting of a deep water jacket

Abstract

The application discloses a kind of deepwater jacket underwater grouting methods, comprising the following steps: S1, in the position of operation ship side entry, weld pipeline water roller, the operation ship is positioned above jacket grouting mouth, so that grouting pipeline is close to vertical angle entry;S2, start to release the grouting pipeline, when the grouting pipeline enters water certain distance, the grouting pipeline is always lowered to the grouting mouth near jacket using the deepwater compensation crane of operation ship;S3, by the movement adjustment of operation ship, the grouting pipeline is connected with the grouting mouth;S4, after completing the cement slurry work of this pile leg and washing grouting pipeline, the grouting pipeline is moved to next grouting mouth by the movement of operation ship, after connection, continue grouting.The application can be suitable for deepwater jacket underwater grouting;Meanwhile, through water pipeline posture control and other measures, avoid the problem that pipeline is blocked when grouting due to pipeline bending, improve construction efficiency, ensure operation quality.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and in particular to a method for underwater grouting of deep-water jacket structures. Background Technology

[0002] Jacket structures are a common foundation type for offshore oil platforms. The jacket structure is connected and fixed to the foundation piles using high-strength grouting material, ultimately consolidating to the seabed. Typically, the grouting port of a shallow-water jacket structure is designed above the water surface, connected to the annular space of the lower pile legs via steel pipelines. Grouting operations are primarily performed above water. However, as domestic offshore oil development moves from shallow to deep water, deep-water jacket platforms are increasingly widely used. To reduce environmental load under in-situ conditions and minimize the amount of grouting pipelines, the grouting port of a deep-water jacket is directly located at the lower pile legs, requiring underwater grouting operations. Compared to traditional above-water grouting, deep-water underwater grouting requires longer grouting pipelines, increasing the risk of pipeline blockage. How to conduct underwater grouting safely and efficiently is a pressing issue that needs to be addressed in the installation of deep-water jacket platforms. Summary of the Invention

[0003] The purpose of this invention is to provide a method for underwater grouting of deep-water jacket structures that is stable and efficient in construction and reduces operational risks.

[0004] To achieve the objectives of this invention, a method for underwater grouting of deep-water jacket structures is provided, comprising the following steps: S1. Weld a pipeline water-drop roller at the water-entry position on the side of the work vessel, and position the work vessel above the grouting port of the guide frame so that the grouting pipeline enters the water at a near-vertical angle. S2. Begin lowering the grouting pipeline. When the grouting pipeline has been submerged in water for a certain distance, use the deep-water compensation crane of the work vessel to lower the grouting pipeline all the way down to the vicinity of the grouting port of the guide frame. S3. By moving and adjusting the work vessel, connect the grouting pipeline to the grouting port; S4. After completing the cement grouting work on the pile leg and cleaning the grouting pipeline, the grouting pipeline is moved to the next grouting port by the operation vessel, connected, and grouting continues.

[0005] As a preferred technical solution of the present invention, in step S1, when welding the pipeline water-drop roller, a wire rope clamping fixture is provided on the side end of the pipeline water-drop roller. The grouting pipeline is fixedly connected to the winch output wire rope on the work vessel and is lowered into the water through the winch output wire rope. The winch output wire rope is threaded through the wire rope clamping fixture, which is used to limit the movement of the winch output wire rope.

[0006] As a preferred embodiment of the present invention, a saddle is fixedly connected to the grouting pipeline near the grout outlet. The saddle is fitted onto the outside of the grouting pipeline. The deep-water compensation crane is connected to the top of the saddle. The saddle is used by the deep-water compensation crane to adjust the position of the pipeline and to bear the weight of the pipeline at the front end of the saddle.

[0007] As a preferred embodiment of the present invention, after the grouting pipeline is laid down, the grouting pipeline is cleaned with water to confirm that the grouting pipeline is unobstructed.

[0008] As a preferred technical solution of the present invention, in step S3, when the grouting pipeline enters the water and approaches the grouting port, the work vessel lowers an underwater robot to assist the work vessel in moving and adjusting, connecting the grouting pipeline to the grouting port. After the connection is completed, the underwater robot conducts a full inspection of the grouting pipeline to check whether the grouting pipeline has a large curvature. The state of the grouting pipeline can be adjusted a second time by the deep-water compensation crane and the work vessel's movement and adjustment, so as to avoid pipeline blockage during grouting due to the bending of the grouting pipeline.

[0009] As a preferred technical solution of the present invention, in step S4, the underwater robot observes the grouting situation at the top of the skirt pile until the cement grout overflows like a waterfall, records the amount of cement ash used for grouting, and continues grouting, with the grouting amount being 0.5 times the recorded amount.

[0010] Compared with the prior art, the present invention provides a method for underwater grouting of deep-water jacket structures, which has the following beneficial effects: This invention overcomes the limitations of traditional grouting methods and is applicable to underwater grouting of deep-water jacket structures. At the same time, through measures such as controlling the attitude of the water inlet pipeline, it avoids the problem of pipeline blockage during grouting due to pipeline bending, thereby improving construction efficiency and ensuring work quality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the grouting pipeline layout of the present invention; Figure 2 This is a schematic diagram of the pipeline water-cooling roller structure of the present invention.

[0012] 1 is the pipeline water-cooling roller, 2 is the grouting pipeline, 3 is the wire rope clamp tooling, 4 is the underwater robot, 5 is the saddle, 6 is the grouting port, and 7 is the deep-water compensation crane. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figures 1-2 This invention provides a method for underwater grouting of deep-water jacket structures, comprising the following steps: S1. Weld the pipeline water-diving roller 1 at the water-entry position on the side of the work vessel, and position the work vessel above the grouting port 6 of the guide frame so that the grouting pipeline 2 enters the water at a near-vertical angle. S2. Start lowering the grouting pipeline 2. When the grouting pipeline 2 has entered the water a certain distance, use the deep-water compensation crane 7 of the work vessel to lower the grouting pipeline 2 all the way down to the vicinity of the grouting port of the guide frame. S3. By moving and adjusting the work vessel, connect the grouting pipeline 2 to the grouting port 6; S4. After completing the cement grouting work on the pile leg and cleaning the grouting pipeline 2, the grouting pipeline 2 is moved to the next grouting port by the operation vessel, connected, and grouting continues.

[0015] In one embodiment of the present invention, in step S1, when welding the pipeline water-drop roller 1, a wire rope clamping fixture 3 is provided on the side end of the pipeline water-drop roller 1. The grouting pipeline 2 is fixedly connected to the winch output wire rope on the work vessel and is lowered into the water through the winch output wire rope. The winch output wire rope is threaded through the wire rope clamping fixture 3, and the wire rope clamping fixture 3 is used to limit the movement of the winch output wire rope.

[0016] In one embodiment of the present invention, a saddle 5 is fixedly connected to the grouting pipeline 2 near the grout outlet end. The saddle 5 is sleeved on the outside of the grouting pipeline 2. The deep-water compensation crane 7 is connected to the top of the saddle 5. The saddle 5 is used by the deep-water compensation crane 7 to adjust the position of the pipeline and to bear the weight of the pipeline at the front end of the saddle 5.

[0017] In one embodiment of the present invention, after the grouting pipeline 2 is lowered, the grouting pipeline 2 is cleaned with clean water to confirm that the grouting pipeline 2 is unobstructed.

[0018] In one embodiment of the present invention, in step S3, when the grouting pipeline 2 enters the water and approaches the grouting port 6, the work vessel lowers an underwater robot 4 to assist in the movement and adjustment of the work vessel, connecting the grouting pipeline 2 to the grouting port 6. After the connection is completed, the underwater robot 4 conducts a full inspection of the grouting pipeline 2 to check whether the grouting pipeline 2 has a large curvature. The state of the grouting pipeline 2 can be adjusted a second time by the deep-water compensation crane 7 and the movement and adjustment of the work vessel to avoid pipeline blockage during grouting due to the curvature of the grouting pipeline 2.

[0019] In one embodiment of the present invention, in step S4, the underwater robot 4 observes the grouting situation at the top of the skirt pile until the cement grout overflows like a waterfall, records the amount of cement ash used for grouting, and continues grouting, with the grouting amount being 0.5 times the recorded amount.

[0020] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for underwater grouting of deep-water jacket structures, characterized in that, Includes the following steps: S1. Weld the pipeline down-water roller (1) at the water entry position on the side of the work vessel, position the work vessel above the grouting port (6) of the guide frame, so that the grouting pipeline (2) enters the water at a near vertical angle. When welding the pipeline down-water roller (1), set the wire rope clamping fixture (3) on the side of the pipeline down-water roller (1). The grouting pipeline (2) is fixedly connected to the winch output wire rope on the work vessel and is lowered into the water through the winch output wire rope. The winch output wire rope is threaded in the wire rope clamping fixture (3). The wire rope clamping fixture (3) is used to limit the movement of the winch output wire rope. S2. Start laying out the grouting pipeline (2). When the grouting pipeline (2) has entered the water a certain distance, use the deep-water compensation crane (7) of the work vessel to lower the grouting pipeline (2) all the way down to the vicinity of the grouting port of the guide frame. The grouting pipeline (2) is fixedly connected to a saddle (5) near the grout outlet. The saddle (5) is fitted on the outside of the grouting pipeline (2). The deep-water compensation crane (7) is connected to the top of the saddle (5). The saddle (5) is used by the deep-water compensation crane (7) to adjust the position of the pipeline and to bear the weight of the pipeline at the front end of the saddle (5). S3. By adjusting the movement of the work vessel, the grouting pipeline (2) is connected to the grouting port (6). When the grouting pipeline (2) enters the water and approaches the grouting port (6), the work vessel lowers an underwater robot (4) to assist the work vessel in adjusting the movement and connecting the grouting pipeline (2) to the grouting port (6). After the connection is completed, the underwater robot (4) inspects the entire grouting pipeline (2) to check if the grouting pipeline (2) has a large arc bend. The state of the grouting pipeline (2) can be adjusted a second time by the deep-water compensation crane (7) and the movement of the work vessel to avoid pipeline blockage during grouting due to the bending of the grouting pipeline (2). S4. After completing the cement grouting work on the pile legs and cleaning the grouting pipeline (2), the grouting pipeline (2) is moved to the next grouting port by the operation vessel, and grouting continues after connection.

2. The underwater grouting method for deep-water jacket structures according to claim 1, characterized in that: After the grouting pipeline (2) is lowered, clean the grouting pipeline (2) with clean water to confirm that the grouting pipeline (2) is unobstructed.

3. The underwater grouting method for deep-water jacket structures according to claim 1, characterized in that: In step S4, the underwater robot (4) observes the grouting situation at the top of the skirt pile until the cement grout overflows like a waterfall, records the amount of cement ash used for grouting, and continues grouting. The amount of grouting is 0.5 times the recorded amount.

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