CN105065777B - Anchoring plate type naked pipeline lateral displacement control device - Google Patents

Abstract

The invention relates to an anchoring plate type naked pipeline lateral displacement control device. The anchoring plate type naked pipeline lateral displacement control device comprises an anchoring plate (1) used for a pressure bearing pipeline (5), a sliding bearing (2), a mooring rope (3) and self-unlocking hooks (4), wherein the anchoring plate (1) comprises a disc (6), connection rings (7) and multiple cylinders (8) with openings in the bottom; the cylinders (8) are evenly distributed; one middle connection ring (7) used for being connected with the mooring rope (3) is fixedly arranged in the center of the disc (6); the other two hook connection rings (7) used for being connected with the self-unlocking hooks (4) are fixedly arranged on the two sides of the disc (6); the sliding bearing (2) comprises an inner bearing ring (9), an outer bearing ring (11) with a groove (10) and a protection layer structure (12); the outer surface of the outer bearing ring (11) is provided with the groove (10); the protection layer structure (12) is fixed to the inner bearing ring (9). According to the anchoring plate type naked pipeline lateral displacement control device, the problem that lateral displacement is large in the whole bending process of a deep sea naked pipeline can be solved effectively.

Description

A lateral displacement control device for anchoring disc-type bare-laid pipelines

Technical field

The invention belongs to the field of overall buckling control of bare pipelines, and is used for lateral displacement control when overall buckling of pipelines occurs.

Background technique

With the development of offshore engineering technology and the development of offshore oil and gas resources, especially the exploitation of deep-water oilfields and marginal oilfields, the working pressure of submarine pipelines continues to increase, and their design temperatures generally reach above 100°C, even 150°C. Most of the submarine pipelines work in high temperature and high pressure environment. Under the joint action of thermal load and pressure load, the pipeline will undergo axial deformation, and under the limitation of the surrounding soil, the pipeline will bear large axial stress. When the axial stress reaches a certain value, the overall buckling of the pipeline will occur, including axial overall movement, vertical buckling and lateral buckling. In general, buried pipelines will buckle vertically and bulge upward due to the restrictions of the surrounding soil; while pipelines laid bare on the seabed are more likely to buckle laterally. The survey of existing submarine pipelines shows that the damage of pipeline buckling deformation cannot be ignored. The overall buckling deformation control of submarine pipelines under the action of high temperature and high pressure has become a key issue in pipeline design.

There are usually two design goals for the overall buckling design of high-temperature and high-pressure submarine pipelines: the first is to completely limit the overall buckling of the pipeline; the second is to allow the overall buckling of the pipeline, but the buckling position of the pipeline and the bending moment after buckling And the stress is controlled within the allowable range, that is, the pipe buckles under control. For the first design goal, trenching or rockfilling is usually used to limit the overall buckling of the pipeline, but for buried pipelines, the buried depth of the pipeline is the control factor of the design, and it can only be achieved when the buried depth meets the requirements. The uplift buckling of the pipeline is restricted, and the axial stress of the pipeline cannot be effectively released. The method of restricting the overall buckling of pipelines by digging trenches or laying rocks is often used in shallow sea construction. In the deep sea, it is difficult and costly to dig trenches for burying and rockfilling. Therefore, for deep-sea bare pipelines, the design method that allows the overall buckling of the pipeline is the only feasible method to control the overall buckling design of the pipeline in deepwater oilfield development.

With the design goal of allowing controlled global buckling of the pipe, it is important that the pipe be able to undergo global buckling at preset locations. The methods commonly used at present are: serpentine pipe laying method, sleeper disturbance method and distributed buoyancy method. Existing methods for stimulating global buckling of submarine pipelines can only stimulate global buckling of submarine pipelines by increasing initial defects or reducing lateral resistance, and transforming global buckling into multi-segment small buckling to protect pipelines from damage. However, when the overall buckling of the pipeline occurs, the amplitude of the overall buckling of the submarine pipeline cannot be controlled. If severe lateral buckling occurs in the subsea pipeline, the lateral displacement is still too large even after the above three methods are adopted. It will lead to excessive stress in the pipeline, which will cause problems such as local buckling or pipeline rupture of the subsea pipeline, which will cause pipeline leakage or make the pipeline unable to work normally. In addition, the above three methods are only suitable for long-distance transmission pipelines, but for the gathering and transportation pipelines inside the oil field, due to their relatively short distance, the above three methods will no longer be applicable.

Contents of the invention

In order to overcome the deficiencies in the prior art, the invention provides a device for lateral displacement control when the deep-sea bare-laying pipeline undergoes overall buckling. When the overall buckling of the pipeline occurs, the device does not provide lateral soil resistance when the lateral movement distance of the pipeline is within the designed safety distance; when the lateral movement distance of the pipeline reaches the design limit safety distance, it can increase the pipeline The lateral soil resistance can control the further increase of the lateral displacement of the pipeline, and effectively solve the problem of excessive lateral displacement during the overall buckling process of the deep-sea bare-laying pipeline. Technical scheme of the present invention is as follows:

An anchoring disc type bare-laid pipeline lateral displacement control device, comprising an anchoring disc (1), a sliding bearing (2), a mooring cable (3) and a self-unlocking hook (4) for a pressure-bearing pipeline (5). parts, of which,

The anchor disc (1) includes a disc (6) with holes, a connecting ring (7) and several cylinders (8) with openings at the bottom, each cylinder (8) is fixedly connected below a certain hole, Each cylinder (8) is evenly arranged and designed symmetrically in the center; an intermediate connector (7) for connecting the mooring line (3) is fixed at the center of the disc (6), and is fixed on both sides for connecting Two other hook connectors (7) of the self-unlocking hook (4);

The sliding bearing (2) includes a bearing inner ring (9), a bearing outer ring (11) with a groove (10) and a protective layer structure (12), and the inner diameter of the bearing inner ring (9) is in contact with the outer diameter of the pipe (5) The bearing inner ring (9) is fixed on the pipe (5); the bearing outer ring (11) can rotate around the bearing inner ring (9), and the outer surface of the bearing outer ring (11) has a groove ( 10), used to wind the mooring line (3); the protective layer structure (12) is fixed on the outer ring of the bearing (9) to surround the entire sliding bearing (2), and there is a hole at the bottom of the protective layer structure (12) for A small hole through which the mooring line (3) passes; two hook holes (13) are provided on the protective layer structure (12);

The self-unlocking hook (4) includes two hooks, one end of the hook has a pin hole, and the other end is hook-shaped, and a pin is used to connect the end with the pin hole to the hook connector (7) on the anchor plate (1). ) is connected; its hooked end is hooked on the hook hole (13) of the protective layer structure (12).

The device provided by the present invention can be used alone in controlling the overall buckling of the bare-laying pipeline, and can also be used in combination with the existing method for stimulating the overall buckling of the submarine pipeline, so as to better control the overall buckling deformation of the submarine pipeline and avoid the deformation caused by the lateral displacement of the pipeline. Excessively large damage to the integrity of the subsea pipeline. Specifically, it has the following beneficial effects:

1. Using sliding bearings instead of rolling bearings to enhance corrosion resistance and wear resistance. It avoids the disadvantages that the rolling elements of rolling bearings are easy to corrode and not wear-resistant.

2. Using bearings to release the mooring line instead of being directly wound on the outer wall of the pipeline, so that there is no direct contact between the mooring line and the outer wall of the pipeline during the release process, avoiding the friction damage of the mooring line to the outer wall of the pipeline, and avoiding the impact of the mooring line on the pipeline. Apply additional torque.

3. There is a protective layer on the outer wall of the bearing to protect the normal operation of the sliding bearing and prevent the adhesion of seabed sediment and marine organisms.

4. It is fixed by the anchor plate, and the maximum lateral displacement of the pipeline is controlled by the length of the mooring cable, which ensures the free movement of the pipeline within a safe range and eliminates the accumulation of axial stress.

5. The control device is simple and convenient, not easy to damage.

Description of drawings

Fig. 1 is the overall structure schematic diagram of device of the present invention

Figure 2 is a schematic diagram of the structure of the anchor plate

Figure 3 is a cross-sectional schematic diagram of a sliding bearing

Figure 4 is a schematic diagram of the state of the self-unlocking hook during and after the laying of the pipeline

Figure 5 is a schematic diagram of the working state of the device when the pipeline moves laterally

In the figure: 1. Anchoring plate, 2. Sliding bearing, 3. Mooring cable, 4. Self-unlocking hook, 5. Pipeline, 6. Round steel plate (disc), 7. Connecting ring, 8. Cylindrical structure , 9. Bearing inner ring, 10. Groove, 11. Bearing outer ring, 12. Protective layer structure, 13. Hook hole

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

1. The lateral displacement control device of the present invention mainly includes an anchor plate 1, a sliding bearing 2, a mooring line 3 and a self-unlocking hook 4 (see FIG. 1 ).

2. The anchor plate 1 includes a circular steel plate 6, three connecting rings 7 and several cylindrical structures 8 with bottom openings (see FIG. 2). Several cylindrical structures 8 with open bottoms are welded below the circular steel plate 6 , and the cylindrical structures 8 are evenly distributed under the circular steel plate 6 . One of the connecting rings 7 is located in the middle above the circular steel plate 6 for connecting the mooring line 3; In the working state, the cylindrical structure 8 on the anchor plate 1 is inserted into the seabed to increase the lateral movement soil resistance of the pipeline 5 and limit the lateral displacement of the pipeline 5 . The structure of the anchoring plate 1 used in the present invention adopts a centrosymmetric design, which can withstand forces from different directions. When the pipeline 5 reciprocates on both sides of the anchoring plate 1, the device has the same effect.

3. The sliding bearing 2 includes a bearing inner ring 9, a bearing outer ring 11 with a groove 10, and a protective layer structure 12 (the protective layer structure in this embodiment is a steel drum larger than the bearing outer ring 11 of the sliding bearing, see Fig. 3). The inner diameter of the bearing inner ring 9 matches the outer diameter of the pipeline 5, and the bearing inner ring 9 is fixed on the pipeline 5 by welding to ensure that there is no relative sliding between them. The inner diameter of the bearing outer ring 11 is equal to or slightly larger than the outer diameter of the bearing inner ring 9, the bearing outer ring 11 can rotate around the bearing inner ring 9, and the outer surface of the bearing outer ring 11 has grooves 10 for winding mooring lines 3. The protective layer structure 12 is welded to the bearing outer ring 9 to enclose the entire sliding bearing 2 so that the sliding bearing 2 can avoid mechanical damage. There are small holes on the protective layer structure 12, and the small holes are located at the bottom of the protective layer structure 12. The mooring line 3 at the sliding bearing 2 protrudes through this small hole and is moored on the anchor disc 1 . In addition, the protective layer structure 12 is provided with two hook holes 13 , and the hook of the self-unlocking hook 4 is hung on the hook holes 13 .

4. The mooring rope 3 can be made of steel cables or cables of other materials. One end of the mooring cable 3 is fixed on the bearing outer ring 11 of the sliding bearing 2, and the other end is fixed on the connecting hole of the anchoring disc 1. The length of the mooring line 3 is determined according to the design requirements, and the required length of the mooring line 3 is wound on the groove 10 on the bearing outer ring 11 .

5. The self-unlocking hook 4 is composed of two hooks. One end of the hook is provided with a pin hole, and the other end is a hook-shaped structure. The pin shaft is used to connect the end with the pin shaft hole with the connecting hole on the anchor plate 1 . During the laying of the pipeline 5, the hook structure is hung on the hook hole 13 on the protective layer structure 12, so as to prevent the anchor plate 1 from detaching from the pipeline 5 (see Fig. 4-1). After the laying of the pipeline 5 is completed, the hook in the self-unlocking hook 4 is automatically disengaged from the hook hole 13 on the protective layer structure 12 (see FIG. 4-2 ). The function of the self-unlocking hook 4 is to ensure that the anchor plate 1 does not break away from the pipeline 5 during the laying process of the pipeline 5; when the pipeline 5 is laid, the self-locking structure does not affect the normal operation of the device of the present invention.

6. After the laying of the pipeline 5 is completed, the anchor plate 1 is inserted into the seabed, and the pipeline 5 is pressed on the top of the anchor plate 1 (see Figure 4-2). The anchor plate 1 is embedded into the seabed by its own gravity and the gravity of the pipeline 5 to increase the soil resistance of the pipeline 5 in lateral movement. When the overall buckling of the pipeline 5 occurs, the pipeline 5 moves laterally, the anchor disc 1 remains still, the mooring line 3 wound on the bearing outer ring 11 is partly loosened, and the anchor disc 1 does not provide lateral soil resistance. When the pipeline 5 moves laterally to a certain distance, the mooring line 3 wound on the bearing outer ring 11 is completely released, and the anchor disc 1 begins to provide lateral soil resistance, thereby limiting the lateral movement of the pipeline 5 (see Figure 5).

Claims (1)

1. An anchoring disc type bare-laying pipeline lateral displacement control device, comprising an anchoring disc (1), a sliding bearing (2), a mooring cable (3) and a self-unlocking hook (4) for a pressure-bearing pipeline (5) ) four parts, of which, The anchor disc (1) includes a disc (6) with holes, a connecting ring (7) and several cylinders (8) with openings at the bottom, each cylinder (8) is fixedly connected below a certain hole, Each cylinder (8) is evenly arranged and designed symmetrically in the center; an intermediate connecting ring (7) for connecting the mooring line (3) is fixed in the center of the disc (6), and on both sides of the intermediate connecting ring (7) Two other hook connecting rings (7) for connecting the self-unlocking hook (4) are also fixed; The sliding bearing (2) includes a bearing inner ring (9), a bearing outer ring (11) with a groove (10) and a protective layer structure (12), and the inner diameter of the bearing inner ring (9) is in contact with the outer diameter of the pipe (5) The bearing inner ring (9) is fixed on the pipe (5); the bearing outer ring (11) can rotate around the bearing inner ring (9), and the outer surface of the bearing outer ring (11) has a groove ( 10), used to wind the mooring line (3); the protective layer structure (12) is fixed on the outer ring of the bearing (9) to surround the entire sliding bearing (2), and there is a hole at the bottom of the protective layer structure (12) for A small hole through which the mooring line (3) passes; two hook holes (13) are provided on the protective layer structure (12); The self-unlocking hook (4) includes two hooks, one end of the hook has a pin hole, and the other end is hook-shaped, and a pin is used to connect the end with the pin hole to the hook connection ring (7) on the anchor plate (1). ) is connected; its hooked end is hooked on the hook hole (13) of the protective layer structure (12).