Sand erosion and deposition balancing device for riser and jumper connection

Abstract

The application discloses a sand scouring and backfilling balance device for a riser and a flat pipe joint section, which comprises a support frame, an anti-scouring assembly and a sand backfilling mechanism, the anti-scouring assembly is fixed at the top end of the support frame, the anti-scouring assembly is arranged to slow down the flow rate of ocean current and block part of the sand in the ocean current from being carried away and falling around the sand backfilling mechanism, the sand backfilling mechanism is installed on the inner side of the support frame and can convert the kinetic energy of the ocean current into its own kinetic energy to transport the sand below to the riser and the flat pipe joint section, through the arrangement of the anti-scouring assembly and the sand backfilling mechanism, the sand scouring and backfilling balance function of the riser and the flat pipe joint section is realized, a series of problems caused by the loss of support of the riser bottom due to the suspension of the joint section is avoided, and the joint section is protected; the whole device can be arranged according to the actual marine situation and pile foundation arrangement, can be recycled and reused, and economic cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ocean engineering, in particular to a sand scouring and backfilling balancing device for a submarine riser and a flat pipe joint section. BACKGROUND

[0002] The scouring of the joint section between the bottom of the jacket riser and the flat pipe is an important technical challenge in the development of submarine oil and gas. The bottom of the jacket riser is often affected by the influence of submarine fluid dynamics. The continuous scouring of the ocean current causes the joint section to be suspended, resulting in the loss of support for the bottom of the riser, changing the stress of the riser and expansion bend system, causing pipeline vibration, and even leading to fatigue failure of the bottom of the riser. If artificial processing is used, the cost is large, and new scouring pits may be formed, which need to be repeatedly processed, increasing the cost.

[0003] Therefore, there is an urgent need for a sand scouring and backfilling balancing device for a submarine riser and a flat pipe joint section to solve the above technical problems. SUMMARY

[0004] The present application aims to solve the above technical problems, that is, to solve the problem that the continuous scouring of the ocean current of the existing submarine riser and flat pipe joint section causes the joint section to be suspended, resulting in the loss of support for the bottom of the riser, changing the stress of the riser and expansion bend system, causing pipeline vibration, and even leading to fatigue failure of the bottom of the riser.

[0005] To this end, the present application provides a sand scouring and backfilling balancing device for a submarine riser and a flat pipe joint section, comprising a support frame, a scouring prevention assembly and a sand backfilling mechanism, the scouring prevention assembly is fixed at the top end of the support frame, the scouring prevention assembly is arranged to slow down the flow rate of the ocean current and block part of the sand in the ocean current from being carried away and falling around the sand backfilling mechanism, the sand backfilling mechanism is installed inside the support frame and can convert the kinetic energy of the ocean current into its own kinetic energy to transport the sand below to the submarine riser and flat pipe joint section.

[0006] In the specific embodiment of the above-mentioned sand scouring and backfilling balancing device for a submarine riser and a flat pipe joint section, the scouring prevention assembly comprises a dense line, a first water blocking plate and a second water blocking plate, the dense line and the first water blocking plate are both fixed at the top end of the support frame in an inclined manner, the second water blocking plate is fixed at both ends of the first water blocking plate, the dense line, the first water blocking plate, the second water blocking plate and the top end of the support frame jointly form a straight triangular prism shape with a hollow interior, the dense line is arranged to block part of the sand in the ocean current from being carried away while allowing the ocean current to pass through, and the blocked sand falls around the sand backfilling mechanism under the action of gravity, the first water blocking plate and the second water blocking plate are provided with a plurality of water permeable holes to slow down the flow rate of the ocean current after passing through the dense line and block part of the sand from passing through.

[0007] In the specific embodiment of the sand scouring and deposition balancing device for the connection section of the submarine riser and the flat pipe, the sand deposition mechanism comprises a roller, a sand shoveling plate and a rotation limiting mechanism, the roller is arranged inside the support frame and can rotate under the action of external force, at least two sand shoveling plates are fixed on the roller in a circumferential distribution, a plurality of arc-shaped plates are fixed on the roller in a circumferential uniform distribution, the arc-shaped plates can drive the roller to rotate under the push of ocean current so that the sand shoveling plate transports the sand below to the connection section of the submarine riser and the flat pipe in the rotating process, and the rotation limiting mechanism is installed in the roller to limit the rotation of the roller in only one direction.

[0008] In the specific embodiment of the sand scouring and deposition balancing device for the connection section of the submarine riser and the flat pipe, the rotation limiting mechanism is a ratchet mechanism, the ratchet mechanism comprises a ratchet wheel, a pawl and a support shaft, the support shaft is fixedly connected with the support frame, the pawl is connected with the support shaft, the ratchet wheel is sleeved on the support shaft and cooperates with the pawl, and the roller is sleeved outside the ratchet wheel and can drive the ratchet wheel to rotate.

[0009] In the specific embodiment of the sand scouring and deposition balancing device for the connection section of the submarine riser and the flat pipe, an annular outer gear is fixed on the outer periphery of the ratchet wheel in a sleeving manner, and an annular inner gear that meshes with the annular outer gear is fixed in the roller.

[0010] In the specific embodiment of the sand scouring and deposition balancing device for the connection section of the submarine riser and the flat pipe, the included angle between the arc-shaped plate and the tangent of the roller is 28°-33°, the width of the arc-shaped plate is half of the radius of the roller, and the length of the arc-shaped plate along the axis direction of the roller is equal to the length of the roller.

[0011] In the specific embodiment of the sand scouring and deposition balancing device for the connection section of the submarine riser and the flat pipe, the length of the sand shoveling plate along the axis direction of the roller is equal to the length of the roller, the sand shoveling plate comprises a first plate body and a second plate body, one end of the first plate body is fixed on the outer wall of the roller, the other end of the first plate body is fixedly connected with the second plate body, and the included angle between the first plate body and the second plate body is 130°-140°.

[0012] In the specific embodiment of the sand scouring and deposition balancing device for the connection section of the submarine riser and the flat pipe, the included angle between the first water blocking plate and the horizontal direction is 55°-65°, and the included angle between the dense line and the horizontal direction is 25°-35°.

[0013] In the specific embodiment of the sand scouring and backfilling balance device for the connection section of the submarine riser and the flat pipe, the support frame comprises a frame and support piles, four support piles are evenly distributed and hinged to the bottom of the frame, the bottom end of the support pile is a sharp structure for inserting into the seabed, the anti-scouring assembly is installed at the top end of the frame, and the sand backfilling mechanism is arranged in the frame and located directly below the anti-scouring assembly.

[0014] In the specific embodiment of the sand scouring and backfilling balance device for the connection section of the submarine riser and the flat pipe, the width of the sand shoveling plate is equal to the radius of the roller, and the distance between the top end of the roller and the top end of the support frame is equal to the radius of the roller.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] 1. The sand scouring and backfilling balance device is installed near the connection section of the submarine riser and the flat pipe, the water blocking plate structure reduces the flow rate of the ocean current, reduces the scouring of the connection section by the ocean current, and the dense line can block the sand carried in the ocean current; by arranging a plurality of circumferentially distributed arc-shaped plates on the roller, the kinetic energy of the ocean current can automatically drive the roller to rotate, and since the ratchet mechanism is arranged in the roller to ensure that the roller can only rotate in one direction, i.e., to ensure that the sand shoveling plate unidirectionally transports sand to the connection section, preventing reverse sand transport from causing more serious scouring, the sand scouring and backfilling balance function of the connection section of the submarine riser and the flat pipe is realized, a series of problems caused by the loss of support at the bottom of the riser due to the suspension of the connection section are avoided, and the connection section of the submarine riser and the flat pipe is protected; the entire device can be arranged according to the actual marine conditions and pile arrangement, and the entire device is recyclable and reusable, saving economic costs.

[0017] 2. The dense line is composed of a plurality of tensioned lines arranged in an array, which not only blocks the sand in the ocean current, but also allows the sand accumulated on the dense line to fall through the dense line under its own gravity to the roller below to supplement the sand transported to the connection section by the sand shoveling plate.

[0018] 3. The first water blocking plate, the second water blocking plate and the dense line cooperatively enclose the top end of the frame to form a hollow straight triangular prism shape, so that the ocean current passes through the dense line, enters the hollow area, and then flows out through the water permeable holes, which not only reduces the flow rate of the ocean current, but also blocks part of the sand to fall around the roller to supplement the sand transported to the connection section by the sand shoveling plate. BRIEF DESCRIPTION OF DRAWINGS

[0019] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0020] Figure 1is a schematic view of the position of the sediment scouring and back silting balancing device provided by the present application at the joint section of the sea bottom riser and the flat pipe;

[0021] Figure 2 is a schematic view of the overall structure of the sediment scouring and back silting balancing device provided by the present application;

[0022] Figure 3 is Figure 2 a left side view;

[0023] Figure 4 is Figure 3 a schematic view of the structure after removing the dense line in

[0024] Figure 5 is a schematic view of the distribution of the sand shoveling plate and the arc-shaped plate on the roller;

[0025] Figure 6 is a schematic view of the structure of the sediment back silting mechanism;

[0026] Figure 7 is a schematic view of the structure of the first water blocking plate;

[0027] Figure 8 is a schematic view of the structure of the second water blocking plate.

[0028] List of reference signs:

[0029] 1, sediment back silting mechanism; 101, shovel-shaped plate; 102, arc-shaped plate; 103, roller; 104, ring-shaped external gear; 105, pawl; 106, ratchet wheel; 107, support shaft; 2, scouring prevention assembly; 201, water permeable hole; 202, second water blocking plate; 203, first water blocking plate; 204, pull ring; 205, dense line; 3, support frame; 301, support pile; 302, frame; 4, seabed; 5, joint section. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the system or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are used to distinguish parts, and are only for the convenience of distinguishing the above-mentioned parts, and have no special meaning unless otherwise stated. The above-mentioned terms cannot be understood as indicating or implying relative importance.

[0032] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0033] The present application relates to the technical field of ocean engineering, in particular to a sand scouring and backfilling balancing device for the junction section of a submarine riser and a flat pipe. The purpose is to solve the problem that the junction section of the submarine riser and the flat pipe is constantly scoured by ocean current, resulting in the phenomenon of the junction section being suspended, the bottom of the riser losing support, the stress of the riser and expansion bend system changing, the pipeline vibrating, and even the bottom of the riser being damaged. For this purpose, the sand scouring and backfilling balancing device for the junction section of the submarine riser and the flat pipe provided by the present application comprises a support frame, an anti-scouring assembly and a sand backfilling mechanism. The anti-scouring assembly is fixed to the top end of the support frame. The anti-scouring assembly is arranged to slow down the flow rate of the ocean current and block part of the sand in the ocean current from being carried away and falling around the sand backfilling mechanism. The sand backfilling mechanism is installed inside the support frame and can convert the kinetic energy of the ocean current into its own kinetic energy to transport the sand below to the junction section of the submarine riser and the flat pipe. The water blocking plate and the dense line are arranged to block the sand from being scoured away and slow down the flow rate of the ocean current. The sand backfilling mechanism can transport the sand to the junction section, achieving the sand scouring and backfilling balancing function of the junction section of the riser and the flat pipe, avoiding the phenomenon of the junction section being suspended and the bottom of the riser losing support, and a series of problems caused thereby. The sand scouring and backfilling balancing device plays a protective role for the junction section of the submarine riser and the flat pipe.

[0034] Next, the sand scouring and backfilling balancing device for the junction section of the submarine riser and the flat pipe provided by the embodiment of the present application will be described in detail in conjunction with the drawings.

[0035] Reference Figures 1-2The application provides a sediment scouring and backfilling balance device for a submarine riser and a flat pipe joint segment 5, which comprises a support frame 3, an anti-scouring assembly 2 and a sediment backfilling mechanism 1, the anti-scouring assembly 2 is fixed at the top end of the support frame 3, the anti-scouring assembly 2 is arranged to slow down the flow rate of ocean current and block part of the sediment in the ocean current scouring the joint segment 5 from being carried away and falling around the sediment backfilling mechanism 1, the sediment backfilling mechanism 1 is installed inside the support frame 3 and can convert the kinetic energy of the ocean current into its own kinetic energy to transport the sediment below to the position of the submarine riser and the flat pipe joint segment 5.

[0036] Specifically, the support frame 3 comprises a frame 302 and support piles 301, the frame 302 is a cuboid, four support piles 301 are hingedly connected to the bottom of the frame 302, that is, the support piles 301 are hingedly connected to the corner ends of the bottom of the frame 302, the bottom end of the support pile 301 is a sharp structure for inserting into the seabed 4, the anti-scouring assembly 2 is installed at the top end of the frame 302, and the sediment backfilling mechanism 1 is arranged in the frame 302 and located directly below the anti-scouring assembly 2.

[0037] The frame 302 specifically comprises four first columns, four second columns and cross beams, the four first columns are arranged in a cuboid shape, the top end and the bottom end of each two adjacent columns are fixedly connected with a cross beam to form a whole cuboid, a second column is fixedly connected between the upper cross beam and the lower cross beam on the same side, the two ends of the support shaft 107 are fixedly connected with adjacent cross beams, and the connecting plate is fixedly connected with the cross beam at the top end of the frame 302.

[0038] In the application, the support piles 301 and the frame 302 are hingedly connected, so that the support piles 301 can be adjusted in angle relative to the frame 302, thereby better adapting to different seabed 4 environments, the support piles 301 are made of solid steel, so as to ensure sufficient strength to support the device and remain stable under the impact of ocean current. The end of the support pile 301 in contact with the seabed 4 is a sharp head, facilitating the insertion of the support pile 301 into the seabed 4.

[0039] In one embodiment, referring to Figures 2-4 and Figures 7-8The anti-scouring assembly 2 comprises a dense line 205, a first water-blocking plate 203 and a second water-blocking plate 202. The dense line 205 and the first water-blocking plate 203 are both fixed in an inclined manner at the top end of the support frame 3, and the second water-blocking plate 202 is fixed at the two ends of the first water-blocking plate 203. The dense line 205, the first water-blocking plate 203, the second water-blocking plate 202 and the top end of the support frame 3 jointly form a straight triangular prism shape with a hollow interior. The dense line 205 is configured to block part of the sediment in the ocean current from being carried away while allowing the ocean current to pass through. The blocked sediment falls around the sediment backfilling mechanism 1 under the action of gravity. The first water-blocking plate 203 and the second water-blocking plate 202 are provided with a plurality of water-permeable holes 201 to slow down the flow rate of the ocean current after passing through the dense line 205 and block part of the sediment.

[0040] The dense line 205 is composed of a plurality of parallelly distributed tensioning lines. The width of the dense line 205, i.e. the number of tensioning lines, is designed according to the size of the frame 302. The top end of the frame 302 and the top end of the first water-blocking plate 203 are both fixed with a row of eyelets 204. One end of the tensioning line is connected to the eyelet 204 at the top end of the frame 302, and the other end of the tensioning line is connected to the eyelet 204 at the top end of the first water-blocking plate 203. The tensioning line is in a tensioned state, and the gap between adjacent two tensioning lines is less than 1 mm, achieving the purpose of blocking sediment in the ocean current. When the sediment accumulates on the dense line 205 to a certain extent, it will fall through the dense line 205 under its own gravity to the roller 103 below to replenish the sediment transported by the sand shoveling plate to the joint section 5. When the entire device is installed, the dense line 205 faces the joint section 5, which helps a part of the sediment to fall down along the dense line 205 to the side close to the joint section 5.

[0041] More specifically, the first water-blocking plate 203 forms an angle of 55°-65° with the horizontal direction. For example, as shown in Figure 6 , the angle is 60°. The dense line 205 forms an angle of 25°-35° with the horizontal direction. For example, as shown in Figure 6 , the angle is 30°. This ensures that the dense line 205 has sufficient area to contact the ocean current, and also allows the sediment to fall under its own gravity to the roller 103 below.

[0042] In addition, as shown in Figure 2As shown, the number of the second water-blocking plates 202 on both sides of the first water-blocking plate 203 is two, and they are arranged in the direction from near to far to the dense line 205. The distance from the bottom end of all the second water-blocking plates 202 to the frame 302 is equal. Since the first water-blocking plate 203 is in an inclined state, the size of each second water-blocking plate 202 is not the same, and gradually decreases in the direction from near to far to the dense line 205. The purpose of the second water-blocking plate 202 is to block the opening between the dense line 205 and the first water-blocking plate 203, so the number of the second water-blocking plate 202 is not specifically limited in the application. The second water-blocking plate 202 is located above the frame 302, which does not affect the rotation of the sand shovel plate and can block part of the sand.

[0043] The inclination angle of the first water-blocking plate 203 is 55°-65°, so that the center of gravity is closer to the middle, increasing the stability of the entire device. The dense line 205 set can block part of the sand carried by the ocean current. The plurality of water-permeable holes 201 on the first water-blocking plate 203 and the second water-blocking plate 202 are evenly spaced, and the diameter of the water-permeable hole 201 needs to be designed according to the local silt particle size. Preferably, the diameter of the water-permeable hole 201 is less than or equal to 0.064 mm, achieving the effect of water permeability but not sand permeability. In this way, under the condition of allowing part of the ocean current to pass through, the flow rate of the ocean current is reduced, the scouring of the sand on the junction section 5 is reduced, and at the same time, most of the sand is blocked to fall around the roller 103. In the process of rotation of the roller 103, more sand can be transported to the junction section 5 by the sand shovel plate, which helps to ensure that the bottom of the junction section 5 of the riser and the flat pipe is not in a suspended state. The first water-blocking plate 203, the second water-blocking plate 202, and the dense line 205 cooperate to surround the top end of the frame 302 to form a hollow straight triangular prism shape, so that the ocean current enters the hollow area after passing through the dense line 205 and then flows out through the water-permeable hole 201. In this way, not only can the flow rate of the ocean current be reduced, but also part of the sand can be blocked to fall around the roller 103 for replenishment of the sand transported to the junction section 5 by the sand shovel plate.

[0044] In one embodiment, referring to Figures 2-6 , the sand backfilling mechanism 1 comprises a roller 103, a sand shovel plate, and a rotation limiting mechanism. The roller 103 is arranged inside the support frame 3 and can rotate under the action of external force. The roller 103 is fixed with at least two sand shovel plates distributed in a circle. The roller 103 is fixed with a plurality of arc-shaped plates 102 uniformly distributed in a circle. The sand shovel plate is located between two adjacent arc-shaped plates 102. The arc-shaped plate 102 can drive the roller 103 to rotate under the push of the ocean current, so that the sand shovel plate transports the sand below to the junction section 5 of the riser and the flat pipe in the process of rotation.

[0045] Specifically, the diameter of the roller 103 is not too large, close to the diameter of a flat tube, such as the diameter of the roller 103 and the flat tube differs by 1mm or 2mm. The tangent angle between the arc-shaped plate 102 and the roller 103 is 28°-33°, and exemplarily, the angle is 30°. The width of the arc-shaped plate 102 is half of the radius of the roller 103. The sand shoveling plate includes a first plate body and a second plate body. One end of the first plate body is fixed to the outer wall of the roller 103, and the other end of the first plate body is fixedly connected with the second plate body. The angle between the first plate body and the second plate body is 130°-140°, and exemplarily, the angle is 135°. The width of the sand shoveling plate is equal to the radius of the roller 103. As shown in Figure 2 , the length of the roller 103 refers to the length of the roller 103 along the axial direction. The lengths of the arc-shaped plate 102 and the sand shoveling plate are equal to the length of the roller 103. The distance between the top end of the roller 103 and the top end of the support frame 3 (i.e. the top end of the frame 302) is equal to the radius of the roller 103.

[0046] In the present application, in order to prevent more sediment in the ocean current of the scouring joint 5 from passing through the part of the anti-scouring assembly 2, the distance between the top end of the roller 103 and the frame 302 is designed to be equal to the radius of the roller 103, and the width of the sand shoveling plate is also equal to the radius of the roller 103. In this way, the gap between the sand shoveling plate and the top end of the frame 302 is shortened while ensuring the smooth rotation of the sand shoveling plate, so that the ocean current directly passing through the gap between the sand shoveling plate and the top end of the frame 302 is reduced, and more ocean current passes through the anti-scouring assembly 2 to block more sediment.

[0047] In the above embodiment, preferably, referring to Figure 6 , the rotation limiting mechanism is a ratchet wheel 106 mechanism. The ratchet wheel 106 mechanism includes a ratchet wheel 106, a pawl 105, and a support shaft 107. The support shaft 107 is fixedly connected with the support frame 3. The pawl 105 is connected with the support shaft 107. The ratchet wheel 106 is sleeved on the support shaft 107 and cooperates with the pawl 105. The roller 103 is sleeved outside the ratchet wheel 106 and can drive the ratchet wheel 106 to rotate.

[0048] In the above embodiment, preferably, an annular external gear 104 is fixedly sleeved on the outer periphery of the ratchet wheel 106. An annular internal gear is fixedly arranged in the roller 103 and meshes with the annular external gear 104. The rotation of the roller 103 drives the ratchet wheel 106 to rotate through the mutual meshing of the annular external gear 104 and the annular internal gear. The two ends of the roller 103 along the length direction are rotationally connected with the support shaft 107. The support shaft 107 supports the roller 103.

[0049] In the above embodiment, since the ratchet 106 mechanism is arranged in the drum 103 to ensure that the drum 103 can only rotate in one direction, i.e. to ensure that the sand shoveling plate can only transport sand to the connection section 5 in one direction, and prevent the reverse transport of sand from causing more serious scouring, the balance between the scouring and back silting of the connection section 5 of the vertical pipe and the horizontal pipe is achieved.

[0050] It should be noted that the number of the arc-shaped plates 102 and the number of the sand shoveling plates are not limited in the present application, and can be designed flexibly according to the actual situation without departing from the basic principles of the present application. For example, as shown in FIG. 1, the number of the arc-shaped plates 102 is six, and the number of the sand shoveling plates is two. Figure 2

[0051] In addition, it should be noted that, as shown in FIG. 1, the balance device between the scouring and back silting is two and is installed on both sides of the connection section 5, which is only an example. However, the specific installation situation can be arranged according to the actual marine situation, and the device is not limited to be installed on both sides of the connection section 5 of the vertical pipe and the horizontal pipe, and is also not limited to two devices. When installing the device of the present application, it is necessary to ensure that the bottom end of the sand shoveling plate can be inserted into the sand of the seabed 4. Figure 1

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.​​

Claims

1. A sediment scour and back silting balancing device for a riser and a jumper spool, characterized in that, The application relates to a support frame, an anti-scouring assembly and a sediment backfilling mechanism, wherein the anti-scouring assembly is fixed to the top end of the support frame, the anti-scouring assembly is arranged to slow down the flow rate of ocean current and block part of the sediment in the ocean current from being carried away and falling around the sediment backfilling mechanism, the sediment backfilling mechanism is installed inside the support frame and can convert the kinetic energy of the ocean current into its own kinetic energy to transport the underlying sediment to the position where the vertical pipe and the horizontal pipe joint, the anti-scouring assembly comprises a dense line, a first water blocking plate and a second water blocking plate, the dense line and the first water blocking plate are both fixed to the top end of the support frame in an inclined manner, the second water blocking plate is fixed to the two ends of the first water blocking plate, the dense line, the first water blocking plate, the second water blocking plate and the top end of the support frame jointly form a straight triangular prism with a hollow interior, the dense line is arranged to block part of the sediment in the ocean current from being carried away under the condition of allowing the ocean current to pass, and the blocked sediment falls around the sediment backfilling mechanism under the action of gravity, a plurality of water permeable holes are arranged on the first water blocking plate and the second water blocking plate to slow down the flow rate of the ocean current after passing through the dense line and block part of the sediment from passing through, the sediment backfilling mechanism comprises a roller, a sand shoveling plate and a rotation limiting mechanism, the roller is arranged inside the support frame and can rotate under the action of external force, at least two sand shoveling plates are fixed to the roller in a circumferential distribution, a plurality of arc-shaped plates are fixed to the roller in a circumferential uniform distribution, the arc-shaped plates can drive the roller to rotate under the pushing of the ocean current so that the sand shoveling plates transport the underlying sediment to the position where the vertical pipe and the horizontal pipe joint in the rotating process, the rotation limiting mechanism is installed in the roller to limit the roller to rotate in only one direction, the width of the sand shoveling plate is equal to the radius of the roller, and the distance between the top end of the roller and the top end of the support frame is equal to the radius of the roller.

2. An erosion and deposition balancing device for a riser-to-pipeline junction according to claim 1, characterized in that, The rotation limiting mechanism is a ratchet mechanism, the ratchet mechanism comprises a ratchet, a pawl and a support shaft, the support shaft is fixedly connected with the support frame, the pawl is connected with the support shaft, the ratchet is sleeved on the support shaft and matched with the pawl, and the roller is sleeved outside the ratchet and can drive the ratchet to rotate.

3. An erosion and deposition balancing device for a riser-to-pipeline junction according to claim 2, characterized in that, The outer periphery of the ratchet is fixed with an annular outer gear in a sleeving mode, and the roller is internally fixed with an annular inner gear meshing with the annular outer gear.

4. The sediment scour and back silting balancing device for a riser-to-flat jumper junction in accordance with claim 1, wherein, The included angle between the arc-shaped plate and the tangent of the roller is 28-33 DEG, the width of the arc-shaped plate is half of the radius of the roller, and the length of the arc-shaped plate along the roller axis direction is equal to the length of the roller.

5. The sediment scour and back silting balancing device for a riser-to-flat jumper junction in accordance with claim 1, wherein, The length of the sand shoveling plate along the roller axis direction is equal to the length of the roller, the sand shoveling plate comprises a first plate body and a second plate body, one end of the first plate body is fixed to the outer wall of the roller, the other end of the first plate body is fixedly connected with the second plate body, and the included angle between the first plate body and the second plate body is 130-140 DEG.

6. The sediment scour and back silting balancing device for a riser-to-flat jumper junction in accordance with claim 1, wherein, The included angle between the first water blocking plate and the horizontal direction is 55-65 DEG, and the included angle between the dense line and the horizontal direction is 25-35 DEG.

7. The sand erosion and deposition balancing device for a riser-to-flat jumper junction of claim 1, wherein, The support frame comprises a frame and support piles, four support piles are hingedly connected to the bottom of the frame and are uniformly distributed, the bottom end of the support piles is a pointed structure for inserting into the seabed, the scour prevention assembly is installed at the top end of the frame, and the sediment backfilling mechanism is arranged in the frame and directly below the scour prevention assembly.

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