Sediment scouring and back silting balancing device for connecting section of seabed vertical pipe and flat pipe

Abstract

The invention discloses a sediment scouring and back silting balancing device for a connecting section of a seabed vertical pipe and a flat pipe, which comprises a support frame, an anti-scouring assembly and a sediment back silting mechanism, and the anti-scouring assembly is fixed at the top end of the support frame; the anti-scour assembly is arranged to be capable of reducing the flow speed of ocean currents and preventing part of silt in the ocean currents of the scour connection section from being taken away and falling around the silt back-silting mechanism. The silt back-silting mechanism is installed on the inner side of the supporting frame and can convert kinetic energy of ocean currents into kinetic energy of the silt back-silting mechanism so as to convey silt below the silt back-silting mechanism to the joint section of the vertical pipe and the flat pipe on the seabed, and by arranging the anti-scour assembly and the silt back-silting mechanism, the silt scour and back-silting balancing function of the joint section of the vertical pipe and the flat pipe is achieved; a series of problems caused by loss of support of the bottom of the vertical pipe due to suspension of the connecting section are avoided, and the connecting section is protected; the whole device can be arranged according to the actual ocean condition and the pile foundation arrangement condition and can be recycled and reused, and the economic cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a silt scouring and silting balance device for a seabed riser and a horizontal pipe connection section. Background Art

[0002] Scouring the connection section between the bottom of the jacket riser and the flat pipe is an important technical challenge in submarine oil and gas development. The bottom of the jacket riser is often affected by the hydrodynamic effects of the seabed. The continuous scouring of the ocean current causes the connection section to be suspended, causing the bottom of the riser to lose support, changing the stress of the riser and expansion bend system, causing pipeline vibration, and even fatigue damage to the bottom of the riser. If manual treatment is used, the cost is high and new scouring pits are easily formed, which requires repeated treatment and increases the cost.

[0003] Therefore, there is an urgent need for a silt scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe to solve the above technical problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing seabed current continuously scours the connection section between the bottom of the jacket riser and the horizontal pipe, causing the connection section to be suspended, resulting in the riser bottom losing support, changing the stress of the riser and expansion bend system, causing pipeline vibration, and even causing fatigue damage to the riser bottom.

[0005] To this end, the present invention provides a sediment scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe, comprising a support frame, an anti-scouring component and a sediment silting mechanism, wherein the anti-scouring component is fixed to the top of the support frame, and the anti-scouring component is configured to slow down the flow rate of the ocean current and block part of the sediment in the ocean current that scours the connection section from being carried away and falling around the sediment silting mechanism, and the sediment silting mechanism is installed on the inner side of the support frame and can use the kinetic energy of the ocean current to convert into its own kinetic energy to transport the sediment below to the connection section between the submarine riser and the horizontal pipe.

[0006] In a specific embodiment of the silt scouring and silting balance device for the above-mentioned submarine riser and horizontal pipe connection section, the anti-scouring assembly includes 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 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 of the support frame are spliced ​​together to form a straight triangular prism shape with a hollow interior, the dense line is configured to block part of the silt in the ocean current from being carried away when allowing the ocean current to pass, and the blocked silt falls around the silt silting mechanism under the action of gravity, and 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 silt from passing through.

[0007] In a specific embodiment of the sediment scouring and silting balance device for the connection section between the above-mentioned submarine riser and the horizontal pipe, the sediment silting mechanism includes a drum, a sand shoveling plate and a rotation limiting mechanism. The drum is arranged on the inner side of the support frame and can rotate under the action of external force. At least two circumferentially distributed sand shoveling plates are fixed on the drum, and a plurality of circumferentially evenly distributed arc plates are fixed on the drum. The arc plates can drive the drum to rotate under the push of ocean currents so that the sand shoveling plate can transport the sediment below to the connection section between the submarine riser and the horizontal pipe during the rotation process. The rotation limiting mechanism is installed in the drum to limit the drum to rotate only in one direction.

[0008] In a specific embodiment of the sediment scouring and siltation balancing device for the connection section between the above-mentioned submarine riser and the horizontal pipe, the rotation limiting mechanism is a ratchet mechanism, and the ratchet mechanism includes a ratchet, a pawl and a support shaft. The support shaft is fixedly connected to the support frame, and the pawl is connected to the support shaft. The ratchet is sleeved on the support shaft and cooperates with the pawl, and the roller is sleeved on the outside of the ratchet and can drive the ratchet to rotate.

[0009] In a specific embodiment of the sediment scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe, an annular external gear is fixed to the outer periphery of the ratchet wheel in a sleeve manner, and an annular internal gear meshing with the annular external gear is fixed inside the drum.

[0010] In a specific embodiment of the sediment scouring and silting balance device for the connection section between the above-mentioned submarine riser and the horizontal pipe, the tangent angle between the arc plate and the drum is 28°-33°, the width of the arc plate is half of the radius of the drum, and the length of the arc plate along the axis of the drum is equal to the length of the drum.

[0011] In a specific embodiment of the sediment scouring and siltation balancing device for the connection section between the above-mentioned submarine riser and the horizontal pipe, the length of the sand shoveling plate along the axis direction of the drum is equal to the length of the drum, and 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 drum, and the other end of the first plate body is fixedly connected to the second plate body, and the angle between the first plate body and the second plate body is 130°-140°.

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

[0013] In a specific embodiment of the sediment scour and siltation balancing device for the connection section between the above-mentioned submarine riser and the horizontal pipe, the support frame includes a frame and support piles, four evenly distributed support piles are hinged at the bottom of the frame, the bottom end of the support pile is a pointed structure for inserting into the seabed, the anti-scour component is installed at the top of the frame, and the sediment siltation mechanism is arranged in the frame and is located directly below the anti-scour component.

[0014] In a specific embodiment of the sediment scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe, the width of the sand shoveling plate is equal to the radius of the drum, and the distance between the top of the drum and the top of the support frame is equal to the radius of the drum.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A sediment scouring and silting balance device is installed near the connection section between the submarine riser and the horizontal pipe. The water-blocking plate structure is used to reduce the flow rate of the ocean current, reduce the scouring of sediment in the connection section by the ocean current, and the dense line can block the sediment carried by the ocean current; by arranging a plurality of arc plates distributed circumferentially on the drum, the kinetic energy of the ocean current can be used to automatically drive the drum to rotate. Since a ratchet mechanism is arranged in the drum, it is ensured that the drum can only rotate in one direction, that is, the sand shoveling plate is guaranteed to transport sand to the connection section in one direction, and the reverse sand transport is prevented from causing more serious scouring, thus realizing the sediment scouring and silting balance function of the connection section between the riser and the horizontal pipe, avoiding a series of problems caused by the loss of support at the bottom of the riser due to the suspension of the connection section, and playing a protective role for the connection section between the submarine riser and the horizontal pipe; the entire device can be arranged according to the actual ocean conditions and the pile foundation arrangement, and the entire device can be recycled and reused, saving economic costs.

[0016] 2. The dense line is composed of multiple tension lines, which can not only block the silt in the ocean current, but also when the silt accumulates to a certain extent on the dense line, it will fall under the drum through the dense line under its own gravity to supplement the silt transported to the connecting section by the sand shoveling plate.

[0017] 3. The first water blocking plate, the second water blocking plate and the dense line cooperate with each other to surround the top of the frame to form a straight triangular prism shape with a hollow interior, so that the ocean current passes through the dense line, enters the hollow area, and then flows out through the water permeable holes. This not only reduces the flow rate of the ocean current, but also blocks part of the sediment from falling around the drum to supplement the sediment transported to the connecting section by the sand shoveling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which: Figure 1 It is a schematic diagram of the position of the sediment scouring and silting balance device provided by the present invention at the connection section between the seabed riser and the horizontal pipe; Figure 2 It is a schematic diagram of the overall structure of the sediment scouring and silting balance device provided by the present invention; Figure 3 yes Figure 2 Left side view; Figure 4 yes Figure 3 Schematic diagram of the structure after removing the dense line; Figure 5 It is a schematic diagram of the distribution of the sand shoveling plate and the curved plate on the drum; Figure 6 It is a structural diagram of the sediment return mechanism; Figure 7 is a schematic structural diagram of a first water blocking plate; Figure 8 Schematic diagram of the structure of the second water blocking plate.

[0019] List of reference numerals: 1. Sediment return mechanism; 101. Shovel plate; 102. Arc plate; 103. Roller; 104. Ring outer gear; 105. Paw; 106. Ratchet; 107. Support shaft; 2. Anti-scour assembly; 201. Water-permeable hole; 202. Second water-blocking plate; 203. First water-blocking plate; 204. Pull ring; 205. Densification line; 3. Support frame; 301. Support pile; 302. Frame; 4. Seabed; 5. Connecting section. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used to define components, only for the convenience of distinguishing the above components, and unless otherwise stated, the above terms have no special meanings and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The present invention relates to the field of marine engineering technology, and in particular to a silt scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe. The purpose is to solve the problem that the existing submarine current continuously scours the connection section between the bottom of the jacket riser and the horizontal pipe, resulting in the connection section being suspended, causing the bottom of the riser to lose support, changing the stress of the riser and expansion bend system, causing pipeline vibration, and even causing fatigue damage to the bottom of the riser. To this end, the present invention provides a sediment scouring and silting balance device for a connection section between a submarine riser and a horizontal pipe, comprising a support frame, an anti-scouring component and a sediment silting mechanism, wherein the anti-scouring component is fixed to the top of the support frame, and the anti-scouring component is configured to slow down the flow rate of the ocean current and block part of the sediment in the ocean current that scours the connection section from being carried away and falling around the sediment silting mechanism, wherein the sediment silting mechanism is installed on the inner side of the support frame and can use the kinetic energy of the ocean current to convert into its own kinetic energy to transport the sediment below to the connection section between the submarine riser and the horizontal pipe. The present invention achieves the purpose of preventing the sediment from being washed away and slowing down the flow rate of the ocean current by arranging a water blocking plate and a dense line, and the sediment silting mechanism can transport the sediment toward the connection section, thereby realizing the sediment scouring and silting balance function of the connection section between the riser and the horizontal pipe, avoiding a series of problems caused by the loss of support at the bottom of the riser due to the suspension of the connection section, and protecting the connection section between the submarine riser and the horizontal pipe.

[0024] Next, the sediment scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe provided by an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0025] See also Figure 1-2 The present invention provides a silt scouring and silting balance device for a seabed riser and a horizontal pipe connecting section 5, comprising a support frame 3, an anti-scouring component 2 and a silt silting mechanism 1, wherein the anti-scouring component 2 is fixed at the top of the support frame 3, and the anti-scouring component 2 is configured to slow down the flow rate of the ocean current and prevent part of the silt in the ocean current that scours the connecting section 5 from being carried away and falling around the silt silting mechanism 1, and the silt silting mechanism 1 is installed on the inner side of the support frame 3 and can use the kinetic energy of the ocean current to convert into its own kinetic energy to transport the silt below to the connecting section 5 of the seabed riser and the horizontal pipe.

[0026] Specifically, the support frame 3 includes a frame 302 and support piles 301. The frame 302 is in the shape of a rectangular parallelepiped. Four evenly distributed support piles 301 are hinged at the bottom of the frame 302, that is, the support piles 301 are hinged at the corner ends of the bottom of the frame 302. The bottom ends of the support piles 301 are pointed structures for inserting into the seabed 4. The anti-scour component 2 is installed at the top of the frame 302, and the sediment resiltation mechanism 1 is arranged in the frame 302 and is located directly below the anti-scour component 2.

[0027] The frame 302 specifically includes four first columns, four second columns and a cross beam. The four first columns are arranged to form a rectangular shape. The top and bottom ends of two adjacent columns are fixedly connected to a cross beam to form a rectangular shape as a whole. A second column is fixed between the upper and lower cross beams on the same side. The two ends of the support shaft 107 are fixedly connected to the adjacent cross beams, and the connecting plate is fixedly connected to the cross beam at the top of the frame 302.

[0028] In the present application, the support pile 301 and the frame 302 are connected in an articulated manner, so that the support pile 301 can be adjusted relative to the frame 302, so as to better adapt to different seabed 4 environments. The support pile 301 is made of solid steel to ensure sufficient strength to support the device and also maintain stability under the impact of ocean currents. The end of the support pile 301 that contacts the seabed 4 is pointed, which facilitates the insertion of the support pile 301 into the seabed 4.

[0029] In one embodiment, see Figure 2-4 and Figure 7-8 The anti-scour component 2 includes 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 to the top of the support frame 3 in an inclined manner. The second water blocking plate 202 is fixed at both 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 of the support frame 3 are spliced ​​together to form a straight triangular prism shape with a hollow interior. The dense line 205 is configured to block part of the silt in the ocean current from being carried away when the ocean current is allowed to pass, and the blocked silt falls around the silt silting mechanism 1 under the action of gravity. A plurality of permeable holes 201 are provided on the first water blocking plate 203 and the second water blocking plate 202 to slow down the flow rate of the ocean current after passing through the dense line 205 and block part of the silt from passing.

[0030] The dense line 205 is composed of a plurality of pull lines arranged side by side. The width of the dense line 205, i.e., the number of pull lines, is designed according to the size of the frame 302. A row of pull rings 204 are fixed to the top of the frame 302 and the top of the first water blocking plate 203. One end of the pull line is connected to the pull ring 204 at the top of the frame 302, and the other end of the pull line is connected to the pull ring 204 at the top of the first water blocking plate 203. The pull line is in a tensioned state, and the gap between two adjacent pull lines is less than 1 mm, so as to achieve the purpose of blocking the silt in the ocean current. When the silt accumulates to a certain extent on the dense line 205, it will fall under the drum 103 through the dense line 205 under its own gravity to supplement the silt transported to the connecting section 5 by the sand shoveling plate. When the entire device is installed, the dense line 205 faces the connecting section 5, which helps to make a part of the silt fall down along the dense line 205 to the side close to the connecting section 5.

[0031] More specifically, the angle between the first water blocking plate 203 and the horizontal direction is 55°-65°. For example, Figure 6 As shown, the angle is 60°. The angle between the dense line 205 and the horizontal direction is 25°-35°. For example, Figure 6 As shown, the angle is 30°, which not only ensures that the dense line 205 has enough area to contact the ocean current, but also enables the silt to fall below the drum 103 under its own gravity.

[0032] In addition, if Figure 2 As 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 sequence from near to far from the dense line 205, and the bottom ends of all the second water blocking plates 202 are at an equal distance from the frame 302. Since the first water blocking plate 203 is in an inclined state, the sizes of the second water blocking plates 202 are different, and they gradually decrease from near to far from 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 plates 202 is not specifically limited in this application. The second water blocking plate 202 is located above the frame 302, so that it does not affect the rotation of the sand shoveling plate and can block part of the mud and sand.

[0033] The first water blocking plate 203 has an inclination angle of 55°-65°, so that its center of gravity is close to the middle, increasing the stability of the entire device. The dense line 205 is set to block part of the silt carried by the ocean current. The multiple water-permeable holes 201 on the first water blocking plate 203 and the second water blocking plate 202 are evenly spaced and spaced. The diameter of the water-permeable hole 201 needs to be designed with reference to the local silt particle size. Preferably, the diameter of the water-permeable hole 201 is less than or equal to 0.064mm, so as to achieve the effect of water permeability but not sand permeability. In this way, while allowing part of the ocean current to pass through, the flow rate of the ocean current is reduced, and the scouring of the ocean current on the silt of the connecting section 5 is reduced. At the same time, most of the silt can be blocked as much as possible to make it fall around the drum 103. In this way, more silt can be transported to the connecting section 5 through the sand shoveling plate during the rotation of the drum 103, which helps to ensure that the bottom of the connecting section 5 between the vertical pipe and the horizontal 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 with each other to surround the top of the frame 302 to form a straight triangular prism shape with a hollow interior, so that the ocean current passes through the dense line 205, enters the hollow area, and then flows out through the water permeable hole 201. This not only reduces the flow rate of the ocean current, but also blocks part of the sediment from falling around the drum 103 to supplement the sediment transported to the connecting section 5 by the sand shoveling plate.

[0034] In one embodiment, see Figure 2-6 The silt returning mechanism 1 includes a drum 103, a sand shoveling plate and a rotation limiting mechanism. The drum 103 is arranged on the inner side of the support frame 3 and can rotate under the action of external force. At least two circumferentially distributed sand shoveling plates are fixed on the drum 103. A plurality of circumferentially evenly distributed arc plates 102 are fixed on the drum 103. The sand shoveling plate is located between two adjacent arc plates 102. The arc plates 102 can drive the drum 103 to rotate under the push of ocean currents so that the sand shoveling plate can transport the silt below to the connecting section 5 between the seabed riser and the horizontal pipe during the rotation process.

[0035] Specifically, the diameter of the roller 103 should not be too large, and should be close to the diameter of the flat tube. For example, the diameter of the roller 103 differs from that of the flat tube by 1 mm or 2 mm. The tangent angle between the arc plate 102 and the roller 103 is 28°-33°, and exemplarily, the angle is 30°. The width of the arc 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 to 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. Figure 2As shown, the length of the drum 103 refers to the length of the drum 103 along the axial direction, and the lengths of the arc plate 102 and the sand shoveling plate are equal to the length of the drum 103. The distance between the top of the drum 103 and the top of the support frame 3 (i.e., the top of the frame 302) is equal to the radius of the drum 103.

[0036] In the present application, in order to block the silt in the ocean current that scours the connecting section 5 and allow more ocean currents to flow through the anti-scouring component 2, the present application designs the distance between the top of the drum 103 and the frame 302 to be equal to the radius of the drum 103, and the width of the sand shoveling plate is also equal to the radius of the drum 103. In this way, while ensuring that the sand shoveling plate can rotate smoothly, it can also shorten the gap between the sand shoveling plate and the top of the frame 302, reduce the ocean current from directly passing through the gap between the sand shoveling plate and the top of the frame 302, thereby allowing more ocean currents to pass through the anti-scouring component 2 to achieve the purpose of blocking more silt.

[0037] In the above embodiments, preferably, refer to Figure 6 The rotation limiting mechanism is a ratchet 106 mechanism, which includes a ratchet 106, a pawl 105 and a support shaft 107. The support shaft 107 is fixedly connected to the support frame 3, the pawl 105 is connected to the support shaft 107, the ratchet 106 is sleeved on the support shaft 107 and cooperates with the pawl 105, and the roller 103 is sleeved on the outside of the ratchet 106 and can drive the ratchet 106 to rotate.

[0038] In the above embodiment, preferably, an annular outer gear 104 is fixed to the outer periphery of the ratchet 106 in a sleeve manner, and an annular inner gear meshing with the annular outer gear 104 is fixed inside the drum 103. The drum 103 drives the ratchet 106 to rotate through the mutual meshing of the annular outer gear 104 and the annular inner gear. The drum 103 is rotatably connected to the support shaft 107 at both ends along the length direction, and the support shaft 107 supports the drum 103.

[0039] In the above embodiment, the ratchet 106 mechanism is arranged in the drum 103 to ensure that the drum 103 can only rotate in one direction, that is, to ensure that the sand shoveling plate transports sand in one direction to the connecting section 5, thereby preventing the reverse sand transport from causing more serious scouring, thereby achieving the function of balancing the scouring and siltation of the connecting section 5 between the vertical pipe and the horizontal pipe.

[0040] It should be noted that the number of the curved plates 102 and the number of the sand shoveling plates are not specifically limited in this application. Without departing from the basic principles of the present invention, the design can be flexibly made according to the actual situation. For example, Figure 2 As shown, there are six arc-shaped plates 102 and two sand-shoveling plates.

[0041] In addition, it should be noted that if Figure 1As shown, there are two silt scouring and silting balance devices, which are respectively installed on both sides of the connecting section 5. This is only an example. However, the specific installation situation can be arranged according to the actual marine conditions. The devices are not limited to being installed on both sides of the connecting section 5 between the marine riser and the horizontal pipe, nor are they limited to being installed on 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 silt on the seabed 4.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sediment scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe, characterized in that: It includes a support frame, an anti-scouring component and a sediment silting mechanism, wherein the anti-scouring component is fixed on the top of the support frame, and the anti-scouring component is configured to slow down the flow rate of the ocean current and block part of the sediment in the ocean current that scours the connection section from being carried away and falling around the sediment silting mechanism, and the sediment silting mechanism is installed on the inner side of the support frame and can use the kinetic energy of the ocean current to convert into its own kinetic energy to transport the sediment below to the connection section between the seabed riser and the horizontal pipe.

2. The silt scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe according to claim 1 is characterized in that: The anti-scour assembly includes 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 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 of the support frame are spliced ​​together to form a straight triangular prism shape with a hollow interior, the dense line is configured to block part of the silt in the ocean current from being carried away when allowing the ocean current to pass, and the blocked silt falls around the silt silting mechanism under the action of gravity, and 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 silt from passing through.

3. The sediment scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe according to claim 1 is characterized in that: The silt silting mechanism includes a drum, a sand shoveling plate and a rotation limiting mechanism. The drum is arranged on the inner side of the support frame and can rotate under the action of external force. At least two circumferentially distributed sand shoveling plates are fixed on the drum. A plurality of circumferentially evenly distributed arc plates are fixed on the drum. The arc plates can drive the drum to rotate under the push of ocean currents so that the sand shoveling plate can transport the silt below to the connection section between the seabed riser and the horizontal pipe during the rotation. The rotation limiting mechanism is installed in the drum to limit the drum to rotate in only one direction.

4. The sediment scouring and silting balance device for the seabed riser and horizontal pipe connection section according to claim 3 is characterized in that: The rotation limiting mechanism is a ratchet mechanism, which includes a ratchet, a pawl and a support shaft. The support shaft is fixedly connected to the support frame, the pawl is connected to the support shaft, the ratchet is sleeved on the support shaft and cooperates with the pawl, and the roller is sleeved on the outside of the ratchet and can drive the ratchet to rotate.

5. The sediment scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe according to claim 4 is characterized in that: An annular external gear is fixed on the outer periphery of the ratchet in a sleeve manner, and an annular internal gear meshing with the annular external gear is fixed inside the drum.

6. The sediment scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe according to claim 3 is characterized in that: The tangent angle between the arc plate and the roller is 28°-33°, the width of the arc plate is half of the roller radius, and the length of the arc plate along the roller axis is equal to the length of the roller.

7. The sediment scouring and silting balance device for the connection section between the submarine riser and the horizontal pipe according to claim 3 is characterized in that: The length of the sand shoveling plate along the axis direction of the drum is equal to the length of the drum. 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 drum, and the other end of the first plate body is fixedly connected to the second plate body. The angle between the first plate body and the second plate body is 130°-140°.

8. The sediment scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe according to claim 2 is characterized in that: 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°.

9. The sediment scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe according to claim 1, characterized in that: The support frame includes a frame and support piles. Four evenly distributed support piles are hinged at the bottom of the frame. The bottom ends of the support piles are pointed structures for inserting into the seabed. The anti-scour component is installed on the top of the frame. The silt silting mechanism is arranged in the frame and is located directly below the anti-scour component.

10. The sediment scouring and silting balance device for the connection section between a submarine riser and a horizontal pipe according to claim 3, characterized in that: The width of the sand shoveling plate is equal to the radius of the roller, and the distance between the top of the roller and the top of the support frame is equal to the radius of the roller.

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