KR20170024958A

KR20170024958A - Seabed located storage apparatus of fluid

Info

Publication number: KR20170024958A
Application number: KR1020150120660A
Authority: KR
Inventors: 강효동; 류민철
Original assignee: 대우조선해양 주식회사
Priority date: 2015-08-27
Filing date: 2015-08-27
Publication date: 2017-03-08

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine fluid storage device, and more particularly, to a submarine fluid storage device capable of storing a fluid even in deep water with high hydrostatic pressure by seawater, by mounting a fluid storage device, .
According to the present invention, there is provided a subsea fluid storage device comprising: a primary barrier for storing fluid and having a wrinkle portion; A secondary barrier formed to surround the outside of the primary barrier; A transfer pipe for transferring the fluid to the primary barrier; And a seawater opening installed in the secondary barrier for entering and exiting the seawater, wherein seawater is filled between the primary barrier and the secondary barrier.

Description

[0001] SEABED LOCATED STORAGE APPARATUS OF FLUID [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine fluid storage device, and more particularly, to a submarine fluid storage device capable of storing a fluid even in deep water with high hydrostatic pressure by seawater, by mounting a fluid storage device .

Generally, when drilling crude oil in the deep sea, oil is separated from the floating platform, and the separated oil is delivered to the floating storage unit (FSU) floating in the sea through the transfer pipe. .

However, when FSU is used, it is shut down due to the weather. Especially, it is difficult to transport oil in poor weather conditions such as Norway.

To solve this problem, there is a way to store oil in the deep sea so that it is not affected by the weather. In the sea floor, hydrostatic pressure by seawater acts in all directions. As the depth of water increases, hydrostatic pressure due to seawater increases, and a pressure vessel type structure is required to apply the petroleum storage facility to the seabed. However, these pressure vessels are limited in depth and the production unit price increases exponentially, and there is a limit to place a petroleum storage facility in a place where the hydrostatic pressure is relatively small, that is, the water depth is low.

In recent years, however, a method of storing a submarine petroleum storage device using a flexible bag has been studied. However, since the flexible bag is made of polyester, durability is limited and the life time is short. Marine Growth).

Korean Patent Publication No. 2014-0014891 (Feb.

In order to solve such conventional problems, it is an object of the present invention to provide a fluid storage device having a structure that varies according to the presence or absence of a fluid, thereby enabling storage of fluid even in a deep water with high hydrostatic pressure by seawater.

According to an aspect of the present invention, there is provided a submarine fluid storage device including: a primary barrier for storing fluid and having a wrinkle portion; A secondary barrier formed to surround the outside of the primary barrier; A transfer pipe for transferring the fluid to the primary barrier; And a seawater opening installed in the secondary barrier for entering and exiting the seawater, wherein seawater is filled between the primary barrier and the secondary barrier.

Preferably, the liquid for holding the hydrostatic pressure is filled in the primary barrier to maintain the hydrostatic pressure of the seawater before storing the fluid, and the hydrostatic pressure holding liquid is preferably a liquid having a density lower than that of the seawater and a density higher than that of the fluid to be stored.

When the fluid is transferred to the primary barrier, the wrinkles of the primary barrier are expanded to store the fluid, and the seawater stored in the secondary barrier is discharged through the seawater opening by an increased area of the primary barrier.

When a leakage of the fluid occurs in the primary barrier, the fluid having a density lower than that of the seawater collects at the upper portion of the secondary barrier and is recovered through the fluid return pipe.

And a third barrier formed to surround the second barrier, wherein a plurality of the second barriers are installed in the third barrier, and the transfer pipes connected to the plurality of second barriers are coupled to each other in the manifold, .

It is preferable that a blocking fence is provided in the seawater opening to prevent the float from entering and exiting.

It is preferable that a hatch cover capable of being opened and closed for maintenance is installed on the upper part of the secondary barrier.

According to the present invention as described above, the fluid storage device having the structure that changes its shape according to the presence or absence of fluid has the effect of storing the fluid even in deep water with high hydrostatic pressure by seawater.

1 is a conceptual illustration of a submarine fluid storage device according to the present invention.
2 is a view showing a submarine fluid storage device according to the present invention.
3 is a view illustrating a process of filling a submarine fluid storage device according to the present invention with fluid.
4 is a view illustrating a process of recovering fluid when fluid leakage occurs in a submarine fluid storage device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted for the sake of clarity and conciseness.

First, a submarine fluid storage device according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

A submarine fluid storage device (100) according to the present invention includes a primary barrier (160) for storing fluid and having a wrinkle portion; A secondary barrier 150 formed to surround the outside of the primary barrier 160; A transfer pipe 130 for transferring the fluid to the primary barrier 160 and a seawater opening 151 installed in the secondary barrier 150 for entering and exiting the seawater, Between the barriers 150, seawater can be filled.

The fluid may be drilled through the floating marine structure 10 and processed, for example, in oil, etc., and stored in the primary barrier 160 via the riser 110.

Generally, at the seabed, the maximum pressure is applied when the pressure difference between the inside and the outside of the fluid storage device is greatest, that is, when the storage device is empty. Therefore, if the case of receiving such a maximum pressure can be eliminated, the choice of storage device as well as operation can be expanded.

In order to eliminate this maximum pressure occurring in the fluid storage device, it is not necessary to consider the pressure in the design of the fluid storage device by completely eliminating the load conditions in which the internal cavities occur.

Therefore, in the present invention, the first barrier 160 may be formed as a tank having a foldable shape so that the first barrier 160 can expand and contract when the fluid flows into and out of the primary barrier 160 in which the fluid is stored . When the primary barrier 160 expands and contracts by the corrugation, the seawater enters and exits through the seawater opening 151 formed in the secondary barrier 150.

That is, when the fluid transferred through the riser 110 is transferred to the primary barrier 160 through the transfer pipe 130, the wrinkles of the primary barrier 160 are expanded while the fluid is stored, The seawater stored in the secondary barrier 150 can be discharged through the seawater opening 151 as much as the increased area of the seawater.

The first barrier 160 is a wrinkle-like structure. The first barrier 160 can be formed using water-repellent fabric or synthetic resin, and can be formed using various materials. The first barrier 160 is a bellows- Sectional shape may be formed in a circular or square shape and may be formed in various other forms. The folded portion of the wrinkle can be reinforced with a stiffener to prevent fatigue damage.

As shown in FIG. 2, the apparatus further includes a tertiary barrier 140 formed to surround the secondary barrier 150, and a plurality of secondary barriers 150 may be installed in the tertiary barrier 140 The transfer pipes 130 connected to the plurality of secondary barriers 150 may be coupled to the manifold 120 and connected to the riser 110.

That is, the fluid is transferred from the floating structure 10 to the manifold 120 through the riser 110, and when the primary barrier 160 to which the fluid is to be stored is determined, the fluid is connected to the primary barrier 160 The transfer pump 131 mounted on the transfer pipe 130 is operated and the opening / closing valve 132 is opened to fill the primary barrier 160.

FIG. 3 is a view showing a process of filling a submarine fluid storage device according to the present invention, and FIG. 4 is a view illustrating a process of recovering fluid when a fluid leakage occurs in a submarine fluid storage device according to the present invention .

As shown in FIG. 3, the primary barrier 160 may be manufactured by pressing before the fluid is initially stored. However, since it is impossible to completely press the primary barrier 160 without the inner space by the corrugation, The liquid 201 for holding the hydrostatic pressure is filled in the primary barrier 160 and the liquid 201 for holding the hydrostatic pressure is lower in density than the seawater and a liquid having a higher density than the fluid to be stored can be used. 3 (b), when the fluid is transferred through the transfer pipe 130, the hydrostatic pressure holding liquid 201 is held in the lower part of the interior of the primary barrier 160 and the fluid is stored thereon. It is possible to prevent the hydrostatic pressure holding liquid 201 from being discharged together. FIG. 3 (c) shows a full loading condition of the primary barrier 160. The filled fluid can then be transported back to the land via a shuttle tanker or the like.

The secondary barrier 150 is formed so as to surround the outer side of the primary barrier 160 and the seawater is filled between the primary barrier and the secondary barrier 160 and the seawater opening 151 is formed in the secondary barrier 150 .

The sea water opening 151 is provided with a mesh structure or other various types of blocking fences 152 to prevent seawater from entering into the interior of the secondary barrier 150, .

The secondary barrier 150 is installed on the seabed ground 20 and can be made of steel or concrete and has a cylindrical shape, a dome shape, a rectangular parallelepiped shape, and the like, Any form can be applied.

A hatch cover 133 connected to an end of the transfer pipe 130 and openable and closable for maintenance of the primary barrier 160 may be installed on the upper portion of the secondary barrier 150.

The fluid to be stored in the primary barrier 160 can be safely stored in the fluid storage tank structure having the double partition walls through the primary barrier 160 and the secondary barrier 150. [

On the other hand, the wrinkle-shaped primary barrier 160 may inevitably suffer damage due to fatigue load or accidental load (accidental load). When the fluid flows out due to the damaged portion, the pressure of the primary barrier 160 and the secondary barrier 150 is the same. Therefore, if there is no external force, a large amount of fluid does not flow out, Since the pressure inside the primary barrier 160 is greater than the external pressure during the injection into the interior of the primary barrier 160, there is a possibility that the fluid will flow out of the primary barrier 160.

As shown in FIG. 4, when a fluid leakage region 301 damaged in the primary barrier 160 is generated as shown in FIG. 4 (a), the leakage fluid 302, for example, oil or the like, It is collected at the outer side of the primary barrier 160 and the upper side of the inside of the secondary barrier 150 because the density is lower than that of the seawater and can be removed to the outside through the fluid recovery pipe 134 as shown in FIG.

The submarine fluid storage device according to the present invention constructed as described above has an advantage that a fluid can be stored even in a deep water having a high hydrostatic pressure due to seawater by mounting a fluid storage device having a structure that varies depending on the presence or absence of a fluid.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be apparent to those skilled in the art that various modifications and variations can be made.

100: Subsea fluid storage device 110: Riser
120: Manifold 130: Transfer piping
131: transfer pump 132: opening / closing valve
133: hatch cover 134: fluid return pipe
140: Third Barrier 150: Second Barrier
151: seawater opening 152: blocking fence
160: Primary barrier 201: liquid for holding hydrostatic pressure
301: Fluid leakage region 302: Leakage fluid

Claims

In subsea fluid storage devices,
A primary barrier for storing fluid and having a wrinkle portion;
A secondary barrier formed to surround the outside of the primary barrier;
A transfer pipe for transferring the fluid to the primary barrier; And
And a seawater opening provided in the second barrier and through which the seawater enters and exits,
And seawater is filled between the primary barrier and the secondary barrier.

The method according to claim 1,
The liquid for holding the hydrostatic pressure is filled in the primary barrier to maintain the hydrostatic pressure of the seawater before storing the fluid,
Wherein the hydrostatic pressure holding liquid is a liquid having a density lower than that of the seawater and a density higher than that of the fluid to be stored.

The method according to claim 1,
Wherein when the fluid is transferred to the primary barrier, the wrinkled portion of the primary barrier is expanded while the fluid is stored, and seawater stored in the secondary barrier is discharged through the seawater opening by an increased area of the primary barrier. .

The method according to claim 1,
Wherein a fluid having a density lower than that of the seawater is collected at an upper portion of the secondary barrier when the leakage of the fluid occurs in the primary barrier, and is recovered through the fluid return pipe.

The method according to claim 1,
And a tertiary barrier formed to surround the secondary barrier,
Wherein a plurality of said secondary barriers are installed in said tertiary barrier,
Wherein the transfer piping connected to each of the plurality of secondary barriers is coupled as one in the manifold.

The method according to claim 1,
And a blocking fence is provided in the seawater opening to prevent the float from entering and exiting.

The method according to claim 1,
And a hatch cover capable of being opened and closed for maintenance is installed on the upper portion of the secondary barrier.