Suspension device for large-load marine riser

Abstract

The invention discloses a suspension device for a large-load marine riser, and relates to the technical field of marine engineering equipment, the suspension device comprises a main body channel, the top end of the main body channel is connected with a conical pipe, one end of the conical pipe is fixedly connected with the main body channel, the other end of the conical pipe is rotatably connected with an annular pipe, and the annular pipe is fixedly connected with a plurality of connecting blocks; a movable groove is formed in the connecting block, the height of the movable groove of the connecting block is gradually decreased, a plurality of through grooves are formed in the annular pipe, a connecting pipe is arranged on the inner side of the annular pipe, the connecting pipe is fixedly connected to the inner side of the conical pipe, the connecting pipe is slidably connected to the through grooves of the annular pipe, a connecting rod is arranged in the connecting pipe, and a cam sliding block is arranged at one end of the connecting rod; the other end of the connecting rod is fixedly connected with a locking wedge, and a reset spring is arranged between the locking wedge and the connecting pipe. According to the clamping device, the annular pipe rotates, and under the cooperation of the cam sliding block, the connecting block and the reset spring, the locking wedge is controlled to stretch out and retract, so that the effect of clamping the annular part of the vertical pipe is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering equipment, and in particular to a suspension device for a large-load marine riser. Background Art

[0002] Marine riser is a very important component in offshore oil and gas development. It refers to the long pipeline system extending from the submarine wellhead to the sea surface facilities (such as drilling platforms, production storage and offloading vessels, etc.). This system is mainly used to transport the extracted oil and gas resources, and in some cases it is also used to lower tools or equipment to the seabed for operations. The marine riser suspension device is a key device for fixing and supporting the marine riser. It ensures that the riser can operate stably in a complex marine environment and can withstand multiple external forces such as water currents, waves and potential ice loads.

[0003] For related technologies, please refer to the patent with announcement number CN201778732U, which discloses a tubing hanger for an underwater vertical oil tree in the ocean, including a hanger body, a hanger diameter in the hanger body that is connected to the production oil pipe, a locking device is provided at the upper end of the hanger body, a closing device is installed at the upper end of the hanger diameter of the hanger body, a short section is connected to the lower end of the hanger body, an isolation tube is connected to the outer surface of the short section, an orientation device is provided between the isolation tube and the short section, and the isolation tube extends into the production casing hanger. This application uses a built-in orientation mechanism and a locking mechanism, and the hanger body and the closing device installed thereon together form a pressure control and sealing guarantee required for an underwater oil tree, provide a production flow channel and establish a connection with external control, and can meet the needs of downhole testing, control and chemical injection; it is fully functional and can meet the needs of underwater oil and gas exploration and development in the ocean.

[0004] The top of the marine riser usually includes an annular portion, and the riser is fixed by fixing the annular portion. When hanging, the riser is suspended by a steel wire rope. With respect to the above-mentioned related technologies, the existing suspension device has a relatively complex fixing method and structure when fixing the marine riser, and the fixing effect is average. When it needs to withstand a large pressure, it is easy to be damaged. Therefore, a suspension device for a large-load marine riser is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0005] In order to improve the fixing effect and fixing efficiency of a marine riser, the present invention provides a suspension device for a large-load marine riser.

[0006] The present invention provides a suspension device for a large-load marine riser, which adopts the following technical solution: A suspension device for a large-load marine riser comprises a main channel, the top of the main channel is connected to a tapered tube, one end of the tapered tube is fixedly connected to the main channel, and the other end is rotatably connected to an annular tube, the diameter of the annular tube radially shrinks from bottom to top, a plurality of connecting blocks are fixedly connected to the outside of the annular tube, a movable groove is provided on the connecting block, the height of the movable groove of the connecting block decreases along the rotation direction of the annular tube, a plurality of through grooves are provided on the annular tube, the through grooves and the movable grooves are arranged one by one and are connected, a connecting tube is provided on the inside of the annular tube, and the connecting tube is fixedly connected to the inner side of the tapered tube. On the other side, the connecting pipe is slidably connected to the through groove of the annular tube, a connecting rod is provided in the connecting pipe, one end of the connecting rod is provided with a cam slider, the cam slider is slidably connected to the connecting block, the connecting rod is located at the movable groove, the other end of the connecting rod is fixedly connected with a locking wedge, a return spring is provided between the locking wedge and the connecting pipe, a first connecting plate is fixedly connected to the conical tube, a second connecting plate is fixedly connected to the annular tube, a hydraulic cylinder is provided between the first connecting plate and the second connecting plate, one end of the hydraulic cylinder is rotatably connected to the first connecting plate, and the other end of the hydraulic cylinder is rotatably connected to the second connecting plate.

[0007] By adopting the above technical solution, before fixing the marine riser, the staff starts the hydraulic cylinder, the hydraulic cylinder drives the annular tube to rotate, and the annular tube drives the connecting block to rotate. Since the position of the connecting tube remains unchanged, when the connecting block rotates, the cam slider slides with the connecting block, thereby changing the extension length of the connecting rod, so that the locking wedge is in a retracted state. In this state, the staff can hang the riser. When the marine riser needs to be fixed, the staff reversely pressurizes the hydraulic cylinder. At this time, under the action of the reset spring, the locking wedge will extend back to its original position. At this time, the annular part of the riser can be clamped and fixed. This structural design can withstand higher axial forces, which is beneficial to improving the fixing effect of the equipment and avoiding damage. The top structure design adopts a conical shape design, so that the riser can sit stably in the top structure.

[0008] Optionally, the bottom end of the main channel is connected to a lower cylinder, and a plurality of straightening cylinders are circumferentially arranged on the lower cylinder.

[0009] By adopting the above technical solution, when the riser shakes due to the irregular action of the waves, the staff starts the righting cylinder, the righting cylinder extends the piston rod, and the piston rod abuts against the riser, thereby fixing the riser. In this way, when shaking occurs, the waves will not generate impact force on the middle channel, which is conducive to improving the stability and safety of the equipment.

[0010] Optionally, a plurality of locking cylinders are provided circumferentially below the straightening cylinder. The locking cylinders are tilted, and a locking tongue is fixedly connected to the piston rod of the locking cylinder. The locking tongue is located in the lower cylinder.

[0011] By adopting the above technical solution, risers are basically divided into rigid risers and flexible risers. Rigid risers need to withstand greater pressure, so their fixation and pressure-bearing can be achieved through top structural design. For flexible risers that need to be fixed, the annular portion of the flexible riser can be clamped on the locking tongue without the need for complex structural design, thereby improving the adaptability of the device, which is suitable for both rigid risers and flexible risers.

[0012] Optionally, the lower cylinder adopts an arc-shaped design, and the steel wire rope used to hang the riser is close to the lower cylinder.

[0013] By adopting the above technical solution, the arc-shaped design of the lower cylinder adopts an anti-bending and anti-shear structure design, which reduces the wear of the crane's wire rope during the pull-in process of the riser and increases its service life.

[0014] Optionally, the locking wedge is designed to be arc-shaped, and when the locking wedge is in an extended state, adjacent locking wedges fit together to form a ring structure.

[0015] By adopting the above technical solution, when the annular portion of the riser needs to be clamped, the locking wedge has an annular structure. The annular structure increases the contact area between the locking wedge and the annular portion of the riser and reduces the gap, which is beneficial to improving the stability and fixing effect of the equipment.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects: 1. By setting the main channel, tapered tube, annular tube, connecting block, connecting tube, cam slider, reset spring, first connecting plate, second connecting plate and hydraulic cylinder, before fixing the marine riser, the staff starts the hydraulic cylinder, the hydraulic cylinder drives the annular tube to rotate, and the annular tube drives the connecting block to rotate. Since the position of the connecting tube remains unchanged, when the connecting block rotates, the cam slider slides with the connecting block, thereby changing the extension length of the connecting rod, so that the locking wedge is in a retracted state. In this state, the staff can hang the riser. When the marine riser needs to be fixed, the staff reversely pressurizes the hydraulic cylinder. At this time, under the action of the reset spring, the locking wedge will extend back to its original position. At this time, the annular part of the riser can be clamped and fixed. This structural design can withstand higher axial forces, which is conducive to improving the fixing effect of the equipment and avoiding damage. The top structure design adopts a tapered shape design, so that the riser can sit stably in the top structure; 2. The arc-shaped design of the lower cylinder reduces the wear on the crane wire rope during the pull-in process of the riser, thus increasing its service life; 3. By setting the arc-shaped design of the locking wedge, when the annular portion of the riser needs to be clamped, the locking wedge has an annular structure. The annular structure increases the contact area between the locking wedge and the annular portion of the riser and reduces the gap, which is beneficial to improving the stability and fixing effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of the overall structure of a suspension device for a large-load marine riser.

[0018] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a suspension device for a large-load marine riser.

[0019] Figure 3 yes Figure 2 Enlarged view of part A.

[0020] Explanation of the reference numerals: 1. Suspension assembly; 11. Conical tube; 12. Annular tube; 121. Through groove; 13. Connecting block; 131. Movable groove; 14. Connecting tube; 15. Connecting rod; 16. Cam slider; 17. Locking wedge; 18. Return spring; 19. First connecting plate; 191. Second connecting plate; 192. Hydraulic cylinder; 2. Main channel; 3. Lower cylinder; 31. Righting cylinder; 32. Locking cylinder; 33. Locking tongue. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with all the accompanying drawings.

[0022] The embodiment of the invention discloses a suspension device for a large-load marine riser.

[0023] Reference Figure 1 , Figure 2 and Figure 3 A suspension device for a large-load marine riser comprises a suspension assembly 1, a main channel 2 and a lower cylinder 3, wherein the suspension assembly 1 and the lower cylinder 3 are respectively connected to the top and bottom ends of the main channel 2. The suspension assembly 1 fixes the marine riser.

[0024] Reference Figure 1 , Figure 2 and Figure 3The suspension assembly 1 includes a tapered tube 11 and an annular tube 12. One end of the tapered tube 11 is fixedly connected to the main channel 2, and the other end is rotatably connected to the annular tube 12. The diameter of the annular tube 12 radially shrinks from bottom to top. A plurality of connecting blocks 13 are fixedly connected to the outside of the annular tube 12. A movable groove 131 is provided on the connecting block 13. The height of the movable groove 131 of the connecting block 13 decreases along the rotation direction of the annular tube 12. A plurality of through grooves 121 are provided on the annular tube 12. The through grooves 121 and the movable grooves 131 are arranged one by one and are connected. A connecting tube 14 is provided on the inner side of the annular tube 12. The connecting tube 14 is fixedly connected to the inner side of the tapered tube 11, and the connecting tube 14 is slidably connected to the through grooves 121 of the annular tube 12. At the groove 121, a connecting rod 15 is provided in the connecting tube 14, and a cam slider 16 is provided at one end of the connecting rod 15. The cam slider 16 is slidably connected to the connecting block 13. The connecting rod 15 is located at the movable groove 131, and the other end of the connecting rod 15 is fixedly connected to a locking wedge 17. A return spring 18 is provided between the locking wedge 17 and the connecting tube 14. A first connecting plate 19 is fixedly connected to the conical tube 11, and a second connecting plate 191 is fixedly connected to the annular tube 12. A hydraulic cylinder 192 is provided between the first connecting plate 19 and the second connecting plate 191, and one end of the hydraulic cylinder 192 is rotatably connected to the first connecting plate 19, and the other end of the hydraulic cylinder 192 is rotatably connected to the second connecting plate 191.

[0025] Reference Figure 1 , Figure 2 and Figure 3 The locking wedge 17 is designed in an arc shape. When the locking wedge 17 is in an extended state, adjacent locking wedges 17 fit together to form a ring structure. When the annular portion of the riser needs to be clamped, the locking wedge 17 is in an annular structure. The annular structure increases the contact area between the locking wedge 17 and the annular portion of the riser and reduces the gap, which is beneficial to improving the stability and fixing effect of the equipment.

[0026] Reference Figure 1 , Figure 2 and Figure 3 Before fixing the marine riser, the staff starts the hydraulic cylinder 192, the hydraulic cylinder 192 drives the annular tube 12 to rotate, and the annular tube 12 drives the connecting block 13 to rotate. Since the position of the connecting tube 14 remains unchanged, when the connecting block 13 rotates, the cam slider 16 slides with the connecting block 13, thereby changing the extension length of the connecting rod 15, so that the locking wedge 17 is in a retracted state. In this state, the staff can hang the riser. When the marine riser needs to be fixed, the staff reversely pressurizes the hydraulic cylinder 192. At this time, under the action of the return spring 18, the locking wedge 17 will extend back to its original position. At this time, the annular part of the riser can be clamped and fixed. This structural design can withstand higher axial forces, which is beneficial to improving the fixing effect of the equipment and avoiding damage. The top structure design adopts a conical shape design, so that the riser can sit stably in the top structure.

[0027] Reference Figure 1 , Figure 2 and Figure 3 The lower cylinder 3 is fixedly connected to the bottom end of the main channel 2, and a plurality of straightening cylinders 31 are arranged on the circumference of the lower cylinder 3. When the riser shakes under the irregular action of the waves, the staff starts the straightening cylinder 31, and the straightening cylinder 31 extends the piston rod, and the piston rod abuts against the riser, thereby fixing the riser. In this way, when shaking occurs, the waves will not generate an impact force on the middle channel, which is conducive to improving the stability and safety of the equipment.

[0028] Reference Figure 1 , Figure 2 and Figure 3 A plurality of locking cylinders 32 are provided in the circumferential direction below the straightening cylinder 31. The locking cylinders 32 are tilted. The piston rods of the locking cylinders 32 are fixedly connected with locking tongues 33. The locking tongues 33 are located in the lower cylinder 3. The risers are basically divided into rigid risers and flexible risers. Rigid risers need to withstand greater pressure, so the top structure design can achieve its fixation and pressure bearing. For flexible risers that need to be fixed, the annular portion of the flexible riser can be clamped on the locking tongue 33, without the need for complex structural design, which improves the adaptability of the device, that is, it is suitable for both rigid risers and flexible risers.

[0029] Reference Figure 1 , Figure 2 and Figure 3 The cylinder adopts an arc design, and the wire rope used to suspend the riser is close to the lower cylinder 3. The arc design of the lower cylinder 3 adopts an anti-bending and anti-shear structure design, which reduces the wear of the crane's wire rope during the pull-in process of the riser and increases its service life.

[0030] The implementation principle of a suspension device for a large-load marine riser in an embodiment of the present invention is as follows: before the marine riser needs to be fixed, the staff starts the hydraulic cylinder 192, the hydraulic cylinder 192 drives the annular tube 12 to rotate, and the annular tube 12 drives the connecting block 13 to rotate. Since the position of the connecting tube 14 remains unchanged, when the connecting block 13 rotates, the cam slider 16 slides with the connecting block 13, thereby changing the extension length of the connecting rod 15, so that the locking wedge 17 is in a retracted state. In this state, the staff can hang the riser. When the marine riser needs to be fixed, the staff reversely pressurizes the hydraulic cylinder 192. At this time, under the action of the return spring 18, the locking wedge 17 will extend back to its original position. At this time, the annular portion of the riser can be clamped and fixed. This structural design can withstand higher axial forces, which is beneficial to improving the fixing effect of the equipment and avoiding damage. The top structure design adopts a conical shape design, so that the riser can sit stably in the top structure.

[0031] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A suspension device for a large-load marine riser, comprising a main channel (2), characterized in that: The top end of the main channel (2) is connected to a conical tube (11), one end of the conical tube (11) is fixedly connected to the main channel (2), and the other end is rotatably connected to an annular tube (12), the diameter of the annular tube (12) radially shrinks from bottom to top, a plurality of connecting blocks (13) are fixedly connected to the outside of the annular tube (12), a movable groove (131) is provided on the connecting block (13), the height of the movable groove (131) of the connecting block (13) decreases along the rotation direction of the annular tube (12), a plurality of through grooves (121) are provided on the annular tube (12), the through grooves (121) and the movable grooves (131) are arranged one-to-one and are connected, a connecting tube (14) is provided on the inner side of the annular tube (12), the connecting tube (14) is fixedly connected to the inner side of the conical tube (11), and the connecting tube (14) is slidably connected to the through groove (121) of the annular tube (12). 21), a connecting rod (15) is provided in the connecting tube (14), one end of the connecting rod (15) is provided with a cam slider (16), the cam slider (16) is slidably connected to the connecting block (13), the connecting rod (15) is located at the movable groove (131), the other end of the connecting rod (15) is fixedly connected to a locking wedge (17), a return spring (18) is provided between the locking wedge (17) and the connecting tube (14), a first connecting plate (19) is fixedly connected to the conical tube (11), a second connecting plate (191) is fixedly connected to the annular tube (12), a hydraulic cylinder (192) is provided between the first connecting plate (19) and the second connecting plate (191), one end of the hydraulic cylinder (192) is rotatably connected to the first connecting plate (19), and the other end of the hydraulic cylinder (192) is rotatably connected to the second connecting plate (191).

2. A suspension device for a large-load marine riser according to claim 1, characterized in that: The bottom end of the main body passage (2) is connected to a lower cylinder (3), and a plurality of straightening oil cylinders (31) are circumferentially arranged on the lower cylinder (3).

3. A suspension device for a large-load marine riser according to claim 2, characterized in that: A plurality of locking cylinders (32) are provided in the circumferential direction below the straightening cylinder (31). The locking cylinders (32) are arranged obliquely. A locking tongue (33) is fixedly connected to the piston rod of the locking cylinder (32). The locking tongue (33) is located in the lower cylinder (3).

4. A suspension device for a large-load marine riser according to claim 2, characterized in that: The lower cylinder (3) is designed to be arc-shaped, and the steel wire rope used to suspend the riser is closely attached to the lower cylinder (3).

5. A suspension device for a large-load marine riser according to claim 1, characterized in that: The locking wedges (17) are designed to be arc-shaped, and when the locking wedges (17) are in an extended state, adjacent locking wedges (17) fit together to form an annular structure.

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