KR20160038501A - Thruster assisted direct riser·umbilical cable direct connection type spherical turret mooring system - Google Patents

Abstract

[0001] The present invention relates to a spherical turret mooring device for a riser / hum cable direct connection employing a thruster, comprising: a plurality of risers vertically penetrating a fore and aft of a marine structure and directly connected to a line riser port; A spherical turret housing fixed to a fore and aft end of the resilient structure; A spherical turret built into the turret housing; A riser spreader provided in the spherical turret and fixed to the spherical turret housing, the plurality of risers passing through; And a tunnel thruster installed below the stern portion draft of the marine structure to control the marine structure to reciprocate only within 180 degrees. [5] The thruster-applied riser / Provide a mooring device.
According to the present invention, there is provided a spherical turret system that rotates only 90 degrees to the left and right of the allowable torsion angle of the riser directly connected to the line, thereby providing a riser / hum cable direct connection type spherical turret mooring device And the operation and maintenance cost is also low, so that it is possible to obtain an effect that it can be generalized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thruster-applied riser / umbilical cable direct-coupled spherical turret mooring device,

The present invention relates to a spherical turret mooring device using a thruster, and more particularly, to an endless free-wheeling motion of a deep-sea deep-sea petroleum production line using a thruster, (Riser) / Umbilical Cable to the shipboard system and to connect the ship to the shipboard system to control the rotation of the turret system and to simplify the existing turret system. The present invention relates to a spherical turret mooring device connected directly to a humidical cable.

In general, a mooring system is a device that moors offshore structures, especially deepwater offshore oil production lines, to a working position in the sea.

In this case, turret mooring system is widely used to allow the offshore structure to rotate in the mooring state. This is because when the turbulence is large and the sea turret is fixed by the anchors and the connecting chain in a poor sea condition, The rotation stops in a direction in which the mooring rod is minimized, that is, in a state where the tooth line is parallel to the wind direction.

However, in order to connect the riser installed in the fixed chain turret to the pipeline installed in the ocean structure, which is a free rotating body, swivel, which is a piping coupling, must be used.

Because this swivel is for high pressure large diameter pipe, it requires exact precision and strong strength.

The main structure of the turret is a vertical cylindrical structure. Since the hull embraces the cylinder and vigorously underwater, it exerts excessive force on the chain connection and makes it difficult to keep the swivel to a certain degree.

In order to solve this problem, the structure is made large and strong, and various auxiliary machinery devices are installed. As a result, it is known that the most expensive example is large-scale investment of high-priced equipment investment of up to 700 million US dollars per system .

In addition, the offshore structure to which the present invention is applied is used in the deep sea, where the deep sea means a depth of 100 m or more, and an offshore structure, in particular, a deep sea offshore oil production ship, Oil FPSO (Floating Production, Storage and Offloading), FLNG ), Floating Production Unit (FPU), Floating Storage and Offloading (FSO), and other similar vessels.

Published Patent No. 2013-0118120 Published Patent No. 2014-0041196 Japanese Laid-Open Patent Application No. 2006-177039 Japanese Laid-Open Patent Application No. 2012-13191 U.S. Published Patent Application No. 2012/0273218 U.S. Published Patent Application 2014/0010597

The present invention has been made in view of the above-mentioned problems in the prior art, and has been made to solve the above problems. The present invention has been made to solve the above problems, The main objective of this research is to provide a new type of thruster that adapts to wind in all directions and a spherical turret mooring device with a riser / hum cable direct connection type.

The present invention provides a means for achieving the above object, comprising: a plurality of risers vertically penetrating a forehead of a marine structure and directly connected to a line riser port; A spherical turret housing fixed to a fore and aft end of the resilient structure; A spherical turret built into the turret housing; A riser spreader provided in the spherical turret and fixed to the spherical turret housing, the plurality of risers passing through; And a tunnel thruster installed below the stern portion draft of the marine structure to control the marine structure to reciprocate only within 180 degrees. [5] The thruster-applied riser / Provide a mooring device.

At this time, the tunnel thruster receives information of a weather vane installed on a ship of the sea rescue system and is driven and controlled, thereby enabling convenient and safe operation.

In addition, the riser spreader may be provided with a longitudinal hinge pin in a long hole pinhole in a pair of spreader hanger symmetrically fixed to the inner front face of the turret housing so as to be horizontally rotatable There are features.

As described above, the riser spreader is provided with an outer ring frame to enable lateral rotation corresponding to the rolling of the deformation structure, and also to enable longitudinal rotation corresponding to the pitch of the deformation structure, and an inner ring frame And a disk-shaped spreader whose periphery is reinforced by the disk-shaped spreader; The longitudinal rotation pin protruding out of the outer ring frame is assembled to the elongated pin hole in the laser spreader hanger and the outer ring frame and the inner ring frame are assembled with the transverse rotation pin so that the through hole of the riser and the riser spreader And also has a feature of buffering the frictional contact force.

In addition, the elongated pinhole for assembling a rotary pin in the riser spreader hanger is also characterized in that the riser spreader can be rotated along with the resistance of the riser spreader when the entire riser swings collectively according to the turning of the reshaping structure.

According to the present invention, only within a minimum necessary turning angle, that is, within a range of 180 degrees (90 degrees to the left from 90 degrees to the left from the initial selected position) within a twist angle that allows the riser to achieve a tooth line parallel to the wind direction, By automatically driving the thruster to turn the turret around its axis of rotation, the underside riser is directly fixed to the deck of the hull and connected directly with the hull system, eliminating the need for Swivel, a key element.

As a result, super high-priced machinery and systems are eliminated, and the turret structure is reduced and weakened. Large high-precision bearing rings and bogies, which were mobilized for high precision, can also be converted to universal mechanical devices. do.

In addition, gantry, a high-rise structure supporting swivels and ancillary systems, is no longer needed, and factory large cranes can also be replaced with a simple crane for valve handling or davit, saving costs.

Particularly, in the spherical turret according to the present invention, an unreasonable hull motion load is always applied to the chain connecting portion of the existing cylinder type turret, so that it is possible to freely turn in three dimensions, so that relative movement is easily generated in any hull motion, No excessive force is applied to the joints.

This not only enables lightweight design due to reduced design load, but also contributes to extending the life of the structure and the chain.

In spherical housing, spherical turret freely swivels in three directions all the way, so it can always optimize to the minimum size because it generates the contact and gripping force in the same way and does not need to assemble or disassemble separate bearings or other parts.

In addition, several risers were used to hold the center position of the turret at the bottom of the ship, and to prevent intertwining with each other, they were matched with each other. In the rolling and pitching of the hull, And a universal vertical axis and a transverse axis to buffer the interference contact force between the riser jacket and the riser jacket.

At this time, the hanger structure supporting the spreader is also an advantage of the spherical turret, which is convenient to extend downward from the nearest turret housing part.

As a result, when the present invention is applied to a large-scale offshore structure, a weight saving of several thousand tons and a cost reduction of several hundred million dollars can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an illustration of a marine vessel structure showing a design example of a spherical turret mooring device connected with a riser / hum cable directing a thruster according to the present invention.
FIG. 2 is an exemplary enlarged cross-sectional view of a spherical turret mooring device using a thruster according to the present invention.
FIG. 3 is a diagram illustrating an example of swing angle control through a spherical turret mooring device using a thunderstick according to an embodiment of the present invention.
FIG. 4 is a graph showing the effect of a 90 ° turn of a marine vessel structure on a riser / umbilical cable dewatered in water, through a spherical turret mooring device connected to a riser / hum cable through a thruster according to the present invention. .
5 is a view illustrating an example of a riser spreader constituting a spherical turret mooring device using a thruster according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

As shown in FIGS. 1 to 5, a riser / humidical cable direct-coupled spherical turret mooring apparatus using a thruster according to the present invention includes a sea structure 100.

At this time, the sea structure refers to various sea structures such as a drill ship including a ship engaged in the production of offshore oil.

Particularly, the sea structure 100 includes all vessels having similar shapes such as Oil FPSO, FLNG, FPU, FSO and the like.

The riser 110 is piped vertically through the sea structure 100 on the forward side of the sea structure 100, and the humidical cable is also wired in the same manner.

The riser is mainly used to transfer liquid fuel or oil / gas onto the ship structure, but it is also used to inject water or gas into the oil well from the ship.

In addition, the above-mentioned humidical cable is a large-sized composite wire packet which is packed with various kinds of power and control wires and control tubes in a strong protective film.

These risers and humidical cables are made of synthetic rubber and plastic, which are strong and strong in tension. They are coated with multiple layers in multiple layers while reinforcing tensile strength and rigidity with wire, metal mesh or nylon fiber to withstand large tensile force and damage or property changes in the sea It is a high-tech product designed to prevent.

In the past, steel pipes were often used as risers, but they were freed from corrosion, made long and wound around a large reel in order to solve the difficulties of connecting short pipes, severe corrosion, and difficulties due to stiffness. And the flexibility to transport it.

Thus, it is no wonder that these risers and humidical cables are not subject to microscopic twisting up to 90 degrees in a water depth of 100 meters to 500-1000 meters.

The upper end of the riser 110 is fixed to a riser porch 120 provided on the deck of the hull and connected to a shipboard deck pipe 130 system.

The humidical cable is also secured to a cable port (not shown) in the same manner and then connected to a cable connection cabinet (not shown).

In addition, a sphere turret housing 200 structure in which the upper and lower portions are cut is formed on the bottom portion of the hull 100 in which the riser 110 and the humidical cable vertically penetrate, and a spherical Sphere turret 300 and the mooring chain MC connected to the seabed anchor is fastened to the turret 300 to form the natural floating hull 100. The mooring point MCP Point.

In order to stably fix the risers 110 and the positions of the humidor cable hangers down through the turret 300 in the center of the turret and to prevent interference or kinking between the respective risers, A plurality of open riser spreaders (410) are provided.

In this case, the spreader hanger 400 that fixes the riser spreader 410 extends downward to the central portion of the spherical turret 300 after being fixed to the turret housing 200.

Further, in order to buffer the frictional contact force between the riser and the spreader hole when the hull is severely rolled or pitched, the transverse gyration of the center of the longitudinal rotating pin 420 of the riser spreader 410 So that a longitudinal gyration of the center of the lateral rotation pin 404 is enabled.

For this purpose, the spreader can be divided into an outer ring frame 406 and a spreader plate P which is reinforced by an inner ring frame 406.

The vertical rotation pin 420 of the outer ring frame 406 is assembled to the pin hole 402 of the spreader hanger 400 to be subjected to lateral rotary motion and is reinforced with the inner ring frame 408 The spreader plate P rotates counterclockwise in the outer ring frame with the center of the horizontal rotation pin 404.

Herein, the work made of the pinhole 402 of the spreader hanger 400 allows the riser spreader 410 to rotate in the horizontal direction at a small angle when the hull 100 turns around the turret 300, .

For example, if the distance between the riser port 120 and the riser spreader 410 is 20 meters, the horizontal rotation angle of the riser spreader 410 is proportional to the horizontal rotation angle of the riser spreader 410, 10 degrees.

Since the depth of most oceanic decks is deeper, the angle of horizontal turn is smaller.

In addition, explain how the hull turns parallel to the winds of all winds by turning 90 degrees to the left and 90 degrees to the right, and explain how the thruster definitely performs its task.

In Fig. 3, the hulls are naturally driven by the winds B, C, and D in the right half-circle area.

In other words, it is the heading state where the wind is hit by the natural physical phenomenon called the weather vaning, that is, the chisel line where the wind resistance is minimized.

At this time, of course, the thruster is not involved.

This time, on the other hand, the hull is not allowed to turn on the winds b, c, d of the left half-circle zone. You can grab it with a thruster at the LA position.

Even at this time, the hull is in a state of a line parallel to the wind direction, so that the mooring load value is minimized, and therefore, the workload of the thruster is not so large.

From this explanation, the hull can be turned only in the left semicircle, no matter what direction the wind blows.

That is, in the first advantageous starting line state, the user only has to turn 90 degrees leftward and 90 degrees rightward.

The standard marine tunnel thruster is a controllable pitch propeller (CPP) type that can be selectively bi-directionally propelled.

In addition, safe and efficient operation can be achieved by linking the wind direction information of the weather vane to the operating circuit of the drive motor and an automation program utilizing current azimuth information.

To ensure greater safety, we recommend 100% safety redundancy of the overall system, including power generation systems, thruster, control system, and power line path, as described above.

On the other hand, since the allowable twist of the flexible riser understood by the industry is known to be 1 degree per 1 meter in length, 90 meters of water depth allows 90 degrees of torsion, and the hull can turn 90 degrees. In fact, the depth of water at many marine sites is much deeper, so twisting is not a concern.

As a result, as described above, according to the present invention, it is predicted that the entire turret apparatus, which is large and extremely complicated, is small and simple, so that it can be designed and manufactured at low cost and can be easily maintained for easy maintenance. It is expected to have a competitive edge to completely replace existing infinitely-rotatable turrets.

100: marine structure 200: turret housing
300: spherical turret 400: spreader hanger
500: Tunnel Thruster 600: MWA (Mid Water Arch)

Claims (5)

A plurality of risers penetrating the fore and aft of the floating structure directly to the line riser port;
A spherical turret housing fixed to a fore and aft end of the resilient structure;
A spherical turret built into the turret housing;
A riser spreader provided in the spherical turret and fixed to the spherical turret housing, the plurality of risers passing through;
And a tunnel thruster installed below the stern portion draft of the marine structure to control the marine structure to reciprocate only within 180 degrees. [5] The thruster-applied riser / Mooring device.
The method of claim 1,
Wherein the tunnel thruster is driven and controlled by receiving information of a weather vane installed on a line of the sea structure, wherein the tunnel thruster is driven and controlled.
The method of claim 1,
Wherein the riser spreader is installed in a long hole pinhole in a pair of spreader hanger symmetrically fixed to the inner front face of the turret housing so as to be rotatable in the lateral direction, Thyristor - based Riser / Umbilical Cable - Directed Spherical Turret Mooring System.
The method of claim 1,
Wherein the riser spreader is provided with an outer ring frame for enabling lateral rotation in response to rolling of the deformation structure and corresponding to pitching of the deformation structure, Shaped disk spreader; The longitudinal rotation pin protruding out of the outer ring frame is assembled to the elongated pin hole in the laser spreader hanger and the outer ring frame and the inner ring frame are assembled with the transverse rotation pin so that the through hole of the riser and the riser spreader Wherein the frictional contact force of the spherical turret is buffered by the thrusters.
The method according to claim 3 or 4,
Wherein the resilient pinhole for assembling the rotary pin in the riser spreader hanger is configured such that when the entire riser is swung collectively according to the swing of the reshaping structure, the riser spreader can rotate along without resistance. ㆍ Spherical turret mooring device with direct connection of humidical cable.

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