System and hoisting device for hoisting a riser

Abstract

The present invention provides a system and a lifting device for lifting a riser. The system for lifting the riser includes: a riser, a locking mechanism, and a plurality of hoops. The plurality of hoops can be sleeved outside the riser, and the plurality of hoops are circumferentially distributed around the axis of the riser. The locking mechanism is configured to detachably connect the plurality of hoops together; the hoop is provided with a first bearing portion, and at least one of the risers is provided with a second bearing portion that cooperates with the first bearing portion. The hoop can apply an upward force to the riser through the first bearing portion and the second bearing portion. By means of the present invention, the technical problem of time-consuming and laborious lifting operation of the riser is alleviated.

Description

Technical Field

[0001] The present invention relates to the field of offshore exploration engineering, and particularly to a system and a hoisting device for hoisting a riser conductor. Background Art

[0002] Large-scale offshore oil platforms have a relatively large number of wellheads. Along with the increase in the number of wellheads, the number of riser conductors is also increasing continuously. Each section of the riser conductor is relatively short and there are many segments, so it is necessary to hoist each segment one by one, and lower and connect each segment one by one.

[0003] Currently, plate-type lifting lugs are usually used to hoist the riser conductor. The plate-type lifting lugs are welded to the riser conductor. After the hoisting connection is completed, it is necessary to cut the lifting lugs manually, and after grinding the cut, the riser conductor can be lowered to a certain depth into the mud surface. This method takes a long time and has low efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a system and a hoisting device for hoisting a riser conductor, so as to alleviate the technical problem that the hoisting operation of the riser conductor is time-consuming and laborious.

[0005] The above object of the present invention can be achieved by the following technical solutions:

[0006] The present invention provides a system for hoisting a riser conductor, including: a riser conductor, a locking mechanism, and a plurality of hoop bodies. The plurality of hoop bodies can be sleeved outside the riser conductor, and the plurality of hoop bodies are circumferentially distributed around the axis of the riser conductor. The locking mechanism is configured to detachably connect the plurality of hoop bodies together;

[0007] The hoop body is provided with a first bearing portion, and at least one of the riser conductors is provided with a second bearing portion that cooperates with the first bearing portion. The hoop body can apply an upward force to the riser conductor through the first bearing portion and the second bearing portion.

[0008] In a preferred embodiment, the locking mechanism includes a longitudinal support plate and a locking bolt. The longitudinal support plate extends along the axial direction of the hoop body. When adjacent two hoop bodies are circumferentially distributed around the axis of the riser conductor, at least one longitudinal support plate of one hoop body abuts against at least one longitudinal support plate of the other hoop body, and the locking bolt locks the longitudinal support plates of the two hoop bodies together.

[0009] In a preferred embodiment, the locking mechanism includes a transverse support plate and a locking bolt. The angle between the transverse support plate and the axis of the hoop body is greater than 0. When two adjacent hoop bodies are circumferentially distributed around the axis of the riser, at least one transverse support plate of one hoop body abuts against at least one transverse support plate of the other hoop body, and the locking bolt locks the transverse support plates of the two hoop bodies together.

[0010] In a preferred embodiment, the locking mechanism includes a longitudinal support plate, a transverse support plate and a locking bolt. The longitudinal support plate extends along the axis of the hoop body; the angle between the transverse support plate and the axis of the hoop body is greater than 0, and the transverse support plate is fixedly connected to the longitudinal support plate. The transverse support plate includes a transverse abutting portion. When two adjacent hoop bodies are circumferentially distributed around the axis of the riser, at least one longitudinal support plate of one hoop body abuts against at least one longitudinal support plate of the other hoop body, and at least one transverse abutting portion of one hoop body abuts against at least one transverse abutting portion of the other hoop body, and the locking bolt locks the transverse support plates of the two hoop bodies together.

[0011] In a preferred embodiment, the first bearing portion includes a convex block provided on the inner wall of the hoop body, and the second bearing portion includes a groove provided on the outer wall of the riser.

[0012] In a preferred embodiment, the convex block is rectangular.

[0013] In a preferred embodiment, the first bearing portion is formed on the inner wall of the hoop body, and the inner wall of the hoop body is subjected to sandblasting treatment; the second bearing portion is formed on the outer wall of the riser subjected to sandblasting treatment.

[0014] In a preferred embodiment, the hoop body is provided with a lifting lug.

[0015] In a preferred embodiment, the upper end and the lower end of the riser are respectively provided with casing threads, and the casing threads are four-wire threads.

[0016] The present invention provides a hoisting device applied to the above-mentioned system for hoisting a riser. The hoisting device includes: a locking mechanism and a plurality of hoop bodies. The plurality of hoop bodies can be circumferentially distributed and connected into a ring body. The locking mechanism is configured to detachably connect the plurality of hoop bodies together; at least one of the hoop bodies is provided with a first bearing portion, and the hoop body can transmit an upward force through the first bearing portion.

[0017] The features and advantages of the present invention are:

[0018] The system for hoisting a conductor has the following advantages: (1) The hoop can be conveniently removed from the conductor and can be installed and removed as needed; (2) The operation of cutting the lifting lug after the hoisting operation of the traditional conductor is omitted, which is beneficial to reducing the installation operation time of the conductor, shortening the operation cycle, improving the hoisting efficiency, saving the operation cost, and achieving cost reduction and efficiency increase in construction; (3) The removed hoop can also be used in the next hoisting, and the hoop can be reused, saving materials, improving the utilization rate, and reducing the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the system for hoisting a conductor provided by the present invention;

[0021] Figure 2 For Figure 1 It is a schematic structural diagram of the conductor in the system shown;

[0022] Figure 3 For Figure 2 It is a partial schematic diagram of the conductor shown;

[0023] Figures 4 - 6 For Figure 1 It is a schematic structural diagram of the hoop and the locking mechanism in the system shown.

[0024] Explanation of the reference numerals in the drawings:

[0025] 10. Conductor; 11. Casing thread; 101. External thread; 102. Internal thread;

[0026] 20. Hoop;

[0027] 30. Locking mechanism; 31. Locking bolt; 32. Locking hole;

[0028] 40. Longitudinal support plate; 50. Transverse support plate; 51. Contact portion;

[0029] 60. First bearing portion; 61. Protrusion;

[0030] 70. Second bearing portion; 71. Groove; 711. Top surface of the groove side wall; 72. Sandblasted surface;

[0031] 80. Lifting lug; 81. Lifting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1

[0034] The present invention provides a system for hoisting a riser conductor, as Figure 1 , Figure 2 and Figure 4 shown. The system for hoisting a riser conductor includes: a riser conductor 10, a locking mechanism 30, and a plurality of hoops 20. The plurality of hoops 20 can be sleeved outside the riser conductor 10, and the plurality of hoops 20 are circumferentially distributed around the axis of the riser conductor 10. The locking mechanism 30 is configured to detachably connect the plurality of hoops 20 together; the hoop 20 is provided with a first bearing portion 60, and at least one riser conductor 10 is provided with a second bearing portion 70 that cooperates with the first bearing portion 60. The hoop 20 can apply an upward force to the riser conductor 10 through the first bearing portion 60 and the second bearing portion 70.

[0035] When hoisting the riser conductor 10, the hoops 20 are attached to the outer sidewall of the riser conductor 10. The plurality of hoops 20 are assembled into a ring shape, and the locking mechanism 30 locks the plurality of hoops 20 together. Through the first bearing portion 60 and the second bearing portion 70, the hoop 20 can drive the riser conductor 10 to move upward. The crane is connected to the hoop 20, and the crane can lift the riser conductor 10 through the hoop 20 for hoisting operations. After the hoisting is completed, the plurality of hoops 20 are disassembled through the locking mechanism 30, and the hoops 20 can be removed from the riser conductor 10. The hoops 20 can be used for the hoisting of the next riser conductor 10. The system for hoisting a riser conductor has the following advantages: (1) It is relatively convenient to remove the hoops 20 from the riser conductor 10, and they can be installed and removed as needed; (2) The operation of cutting the lifting lugs of the traditional riser conductor 10 after hoisting operations is omitted, which is beneficial to reducing the installation operation time of the riser conductor 10, shortening the operation cycle, improving the hoisting efficiency, saving the operation cost, and achieving cost reduction and efficiency improvement in construction; (3) The removed hoops 20 can also be used in the next hoisting. The hoops 20 can be reused, saving materials, improving the utilization rate, and reducing the operation cost.

[0036] In the system for hoisting a riser conductor, the number of hoops 20 is greater than or equal to 2, for example, it can be 2, 3, or 4. The hoop 20 is arc-shaped and can be attached to the outer wall of the riser conductor 10. Preferably, the number of hoops 20 is 2, and the hoop 20 is semi-circular in shape.

[0037] In one embodiment, the locking mechanism 30 includes a longitudinal support plate 40 and a locking bolt 31. The longitudinal support plate 40 extends along the axial direction of the hoop body 20. When two adjacent hoop bodies 20 are circumferentially distributed around the axis of the riser 10, at least one longitudinal support plate 40 of one hoop body 20 abuts against at least one longitudinal support plate 40 of the other hoop body 20, and the locking bolt 31 locks the longitudinal support plates 40 of the two hoop bodies 20 together. As Figure 4 and Figure 5 shown, through the longitudinal support plate 40, it is convenient to lock two adjacent hoop bodies 20 together, and at the same time make the hoop bodies 20 relatively close to each other to clamp the riser 10. The extending direction of the longitudinal support plate 40 can be parallel to the axial direction of the hoop body 20. A locking hole 32 is provided on the longitudinal support plate 40, and the locking bolt passes through the locking hole 32 to clamp the two longitudinal support plates 40.

[0038] In one embodiment, the locking mechanism 30 includes a transverse support plate 50 and a locking bolt 31. The included angle between the transverse support plate 50 and the axial direction of the hoop body 20 is greater than 0. When two adjacent hoop bodies 20 are circumferentially distributed around the axis of the riser 10, at least one transverse support plate 50 of one hoop body 20 abuts against at least one transverse support plate 50 of the other hoop body 20, and the locking bolt 31 locks the transverse support plates 50 of the two hoop bodies 20 together. As Figure 4 and Figure 5 shown, through the transverse support plate 50, relative movement between two adjacent hoop bodies 20 in the longitudinal direction can be prevented, and the two hoop bodies 20 can transmit the acting force in the up and down direction through the transverse support plate 50. A locking hole 32 is provided on the transverse support plate 50, and the locking bolt passes through the locking hole 32 to clamp the two transverse support plates 50. The included angle β between the transverse support plate 50 and the axial direction of the hoop body 20 satisfies: 0 < β ≤ 90°, preferably, the transverse support plate 50 is perpendicular to the axial direction of the hoop body 20.

[0039] In one embodiment, the locking mechanism 30 includes a longitudinal support plate 40, a transverse support plate 50 and a locking bolt 31. The longitudinal support plate 40 extends along the axial direction of the hoop body 20; the included angle between the transverse support plate 50 and the axial direction of the hoop body 20 is greater than 0, the transverse support plate 50 is fixedly connected to the longitudinal support plate 40, and the transverse support plate 50 includes a transverse abutting portion 51; when two adjacent hoop bodies 20 are circumferentially distributed around the axis of the riser 10, at least one longitudinal support plate 40 of one hoop body 20 abuts against at least one longitudinal support plate 40 of the other hoop body 20, at least one transverse abutting portion 51 of one hoop body 20 abuts against at least one transverse abutting portion 51 of the other hoop body 20, and the locking bolt 31 locks the transverse support plates 50 of the two hoop bodies 20 together. As Figures 4 - 6As shown, the transverse support plates 50 and the longitudinal support plates 40 are arranged alternately, so that the connection between the two adjacent hoop bodies 20 can be more firmly established, which is conducive to the hoop body 20 clamping the watertight conduit 10, avoiding the relative movement of the two adjacent hoop bodies 20, and the longitudinal force can be transmitted between the hoop bodies 20, thereby ensuring the reliability of the operation of each hoop body 20. Figure 5 and Figure 6 As shown, the transverse abutment portion 51 extends to the outside of the longitudinal support plate 40. Furthermore, a plurality of longitudinally distributed transverse support plates 50 are connected to one longitudinal support plate 40. After the watertight conduit 10 is hoisted to the designated position or the assembly connection is completed, the locking bolt 31 can be manually unlocked and the hoop body 20 can be removed to facilitate the next step.

[0040] In one embodiment, if Figures 2 - 5 As shown, the first bearing part 60 includes a protrusion 61 arranged on the inner wall of the hoop body 20, and the second bearing part 70 includes a groove 71 arranged on the outer wall of the watertight duct 10. Before lifting, the hoop body 20 is installed at the groove 71 of the watertight duct 10, the protrusion 61 on the hoop body 20 is aligned with the groove 71 on the watertight duct 10, the locking bolt 31 locks the hoop body 20, and the protrusion 61 is embedded in the groove 71. The protrusion 61 is combined with the groove 71 to limit the hoop body 20 from sliding relative to the watertight duct 10, thereby strengthening the connection strength between the hoop body 20 and the watertight duct 10. Preferably, the outer wall of the watertight duct 10 has four grooves 71 distributed along the circumferential direction, and four protrusions 61 are correspondingly provided on multiple hoop bodies 20.

[0041] Furthermore, the projection 61 is rectangular, and the top surface of the projection 61 matches the top surface 711 of the groove side wall, which is conducive to the projection 61 transmitting an upward force to the watertight pipe 10. Furthermore, the top surface 711 of the groove side wall of the watertight pipe 10 is provided with an inscribed angle, that is, the top surface 711 of the groove side wall is inclined upward from the outside to the inside. When the watertight casing is lifted upward by the hoop body 20, the top surface of the projection 61 of the hoop body 20 is tightly combined with the top surface 711 of the groove side wall, which strengthens the combination of the projection 61 of the hoop body 20 and the groove 71 of the watertight pipe 10, and can prevent the projection 61 from slipping out of the groove 71 during the lifting process. Preferably, the inscribed angle is set to 45°, that is, the angle between the top surface 711 of the groove side wall and the axial direction of the watertight pipe 10 is 45°.

[0042] In one embodiment, the first bearing portion 60 is formed on the inner wall of the hoop body 20, and the inner wall of the hoop body 20 is sandblasted; the second bearing portion 70 is formed on the outer wall of the watertight pipe 10 that is sandblasted. Through the sandblasting, the contact friction between the hoop body 20 and the watertight pipe 10 is increased, the clamping force is enhanced, and the risk of the watertight pipe 10 and the hoop body 20 slipping can be effectively eliminated. Specifically, Figure 2As shown, the outer wall of the conductor 10 is provided with a sandblasted surface 72, and the second bearing portion 70 includes the sandblasted surface 72.

[0043] As Figure 4 and Figure 5 shown, the hoop body 20 is provided with lifting lugs 80 to facilitate connection with a crane. In one embodiment, each of the lifting lugs 80 is provided with a circular lifting hole 81, and the crane hanger passes through the circular lifting hole 81 to realize the hoisting operation of the conductor 10. The lifting lugs 80 can be connected to the hoop body 20 by welding. The floating crane lifts from the barge, the crane hanger passes through the lifting hole 81 of the lifting lug 80, and the conductor 10 is lifted.

[0044] The upper end and the lower end of the conductor 10 are respectively provided with casing threads 11. The casing threads 11 are four-line threads. By adopting four-line threads, the number of threading turns can be reduced, which is convenient for the connection between conductors 10. As Figure 1 shown, the casing thread 11 at the upper end of the conductor 10 is an internal thread 102, and the casing thread 11 at the lower end of the conductor 10 is an external thread 101. This system for hoisting the conductor has improved the hoop body 20 and optimized the structure of the conductor 10 at the same time, which can ensure that the hoop body 20 and the conductor 10 are locked and do not separate during hoisting and lowering, and ensure the safe and efficient hoisting and lowering operation of the conductor 10.

[0045] The hoisting process of this system for hoisting the conductor is as follows: (1) Fix the hoop body 20 outside the conductor 10, and the convex block 61 is inserted into the groove 71; (2) Lock adjacent hoop bodies 20 with the locking bolts 31 to ensure firm connection; (3) The crane hanger passes through the lifting hole 81 of the lifting lug 80 on the hoop body 20 to lift the conductor 10; (4) After the conductor 10 reaches the predetermined position, remove the locking bolts 31, release the connection between the groove 71 and the convex block 61, and unload the hoop body 20; (5) Through the casing threads 11 at the end of the conductor 10, connect the conductor 10 to the next conductor 10, and then complete the lowering.

[0046] Embodiment 2

[0047] The present invention provides a hoisting device, which includes: a locking mechanism 30, and a plurality of hoop bodies 20. The plurality of hoop bodies 20 can be circumferentially distributed and connected into a ring body. The locking mechanism 30 is configured to detachably connect the plurality of hoop bodies 20 together; at least one hoop body 20 is provided with a first bearing portion 60, and the hoop body 20 can transmit an upward force through the first bearing portion 60.

[0048] The hoisting device can be applied to the system for hoisting the riser. The crane is connected to the riser 10 through this hoisting device to realize the hoisting and lowering operation of the riser 10, and has the following advantages: (1) It is relatively convenient to remove the hoop 20 from the riser 10, and it can be installed and removed as needed; (2) The operation of cutting the lifting lug 80 after the hoisting operation of the traditional riser 10 is omitted, which is beneficial to reducing the installation operation time of the riser 10, shortening the operation cycle, saving the operation cost, improving the hoisting efficiency, and realizing cost reduction and efficiency increase in construction; (3) This hoisting device can also be used in the next hoisting, can be reused, saves materials, improves the utilization rate, and reduces the operation cost.

[0049] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention based on the content disclosed in the application documents.

Claims

1. A system for hoisting a marine riser, characterized in that, Comprising: A riser, a locking mechanism, and a plurality of hoops. The plurality of hoops can be sleeved outside the riser, and the plurality of hoops are circumferentially distributed around the axis of the riser. The locking mechanism is configured to detachably connect the plurality of hoops together; The hoop is provided with a first bearing portion, and at least one of the risers is provided with a second bearing portion that cooperates with the first bearing portion. The hoop can apply an upward force to the riser through the first bearing portion and the second bearing portion; The locking mechanism includes a longitudinal support plate, a transverse support plate, and a locking bolt. The longitudinal support plate extends along the axial direction of the hoop; the included angle between the transverse support plate and the axial direction of the hoop is greater than 0. The transverse support plate is fixedly connected to the longitudinal support plate, and the transverse support plate includes a transverse abutting portion; When two adjacent hoops are circumferentially distributed around the axis of the riser, at least one longitudinal support plate of one hoop abuts against at least one longitudinal support plate of the other hoop, and at least one transverse abutting portion of one hoop abuts against at least one transverse abutting portion of the other hoop. The locking bolt locks the transverse support plates of the two hoops together; The first bearing portion includes a convex block provided on the inner wall of the hoop, and the second bearing portion includes a groove provided on the outer wall of the riser; The hoop is provided with a lifting lug.

2. The system for hoisting a marine riser according to claim 1, characterized in that, The convex block is rectangular.

3. The system for hoisting a marine riser according to claim 1, characterized in that, The first bearing portion is formed on the inner wall of the hoop, and the inner wall of the hoop is subjected to sandblasting treatment; the second bearing portion is formed on the outer wall of the riser that has been subjected to sandblasting treatment.

4. The system for hoisting a marine riser according to claim 1, characterized in that, The upper end and the lower end of the riser are respectively provided with casing threads, and the casing threads are four-wire threads.

5. A hoisting device, characterized in that, Applied to the system for hoisting a riser according to any one of claims 1-4, the hoisting device includes: a locking mechanism, and a plurality of hoops. The plurality of hoops can be circumferentially distributed and connected into a ring body. The locking mechanism is configured to detachably connect the plurality of hoops together; at least one of the hoops is provided with a first bearing portion, and the hoop can transmit an upward force through the first bearing portion.

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