KR20170028648A - Operation method of sub-sea storage system having heating function and the sub-sea storage system - Google Patents

Operation method of sub-sea storage system having heating function and the sub-sea storage system Download PDF

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Publication number
KR20170028648A
KR20170028648A KR1020150125516A KR20150125516A KR20170028648A KR 20170028648 A KR20170028648 A KR 20170028648A KR 1020150125516 A KR1020150125516 A KR 1020150125516A KR 20150125516 A KR20150125516 A KR 20150125516A KR 20170028648 A KR20170028648 A KR 20170028648A
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KR
South Korea
Prior art keywords
oil
pipe
flexible bag
storage system
stored
Prior art date
Application number
KR1020150125516A
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Korean (ko)
Inventor
박병원
Original Assignee
대우조선해양 주식회사
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Priority to KR1020150125516A priority Critical patent/KR20170028648A/en
Publication of KR20170028648A publication Critical patent/KR20170028648A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B65D88/748—Large containers having means for heating, cooling, aerating or other conditioning of contents for tank containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/78—Large containers for use in or under water

Abstract

The present invention relates to a submarine storage system having a heating function and a method of operating the submarine storage system. The hot oil produced in the oil well is used as a heat source, and a high temperature oil Thereby suppressing the generation of hydrate and wax, thereby reducing maintenance costs due to periodic cleaning.

Description

TECHNICAL FIELD [0001] The present invention relates to a submarine storage system having a heating function and a method of operating the submarine storage system.

The present invention relates to a submarine storage system having a heating function and a method of operating the submarine storage system. More particularly, the present invention relates to a submarine storage system having a heating function and a method of operating the submarine storage system using the high temperature oil produced in an oil well as a heat source, The present invention relates to a submarine storage system and a method of operating the submarine storage system that can circulate high-temperature oil into a wound heating pipe to suppress hydrate and wax formation in the oil.

The development of offshore oil fields is gradually moving to the deep sea, and the scale of oilfields is also larger than in the past and onshore.

Deep sea oil development is affected by oil prices because production costs for oil production are relatively high, and various methods are used to minimize impacts in deep water environments.

In addition, large-scale facilities such as pipeline transport and FPSO (Floating Production Storage Offloading) must be invested to process crude oil produced.

Recent development of subsea system technology has been actively researched how to move some functions of floating platform to the seabed.

Moving suspended structures and equipment floating on the water to the seabed is relatively free from the effects of environmental loads and can replace some of the costly pipeline, riser, and floating platform inputs. .

Subsea pumps, separators, and Subsea compressors are also being introduced into the submarine compressors.

In addition, technology development is underway for a subsea storage tank that is responsible for storage.

Underwater storage tank is a concept to move the storage space of floating structure to the seabed so as to cope with the necessity of a large-scale floating storage system when a large storage space is required.

The seabed storage tank is configured to store crude oil or processed oil in the seabed and take it out through a shuttle tanker.

The capacity of the subsea storage tank is selected considering the total capacity required in the field. If necessary, several submarine storage tanks may be arranged and distributed. In this case, a large scale floating storage facility such as FPSO Storage System), and conceptual studies have shown that CAPEX / OPEX cost can be lowered by the same capacity than floating storage facilities.

Under sea storage tanks, in case of inundation, store oil in a closed storage space and consist of steel or concrete.

The seabed storage tank is structured so that seawater can flow freely, not in a sealed structure, because it is highly influenced by water pressure in the case of deep sea, and a flexible bag is placed inside to store oil in the flexible bag. In this case, the outer wall of the seabed storage tank is composed of steel or concrete. It plays a role of preventing the oil, which is relatively denser than water, It protects the flexible bag from impact.

2 is a vertical cross-sectional view showing a conventional deep sea submarine storage tank, and FIG. 3 is a graph showing a change in internal fluid temperature of an undersea storage tank according to time; FIG. , And FIG. 4 is a graph showing generation of hydrate or wax at a temperature lower than a predetermined temperature in the crude oil produced.

1 and 2, a conventional deep sea submerged storage tank 10 has a structure in which an outer wall 11 is made of steel or concrete, and a flexible bag for storing oil (crude oil) (Flexible Bag) 12 is installed on the seabed. The seawater storage tank (10) is configured such that seawater flows in and out.

Each of the seabed storage tanks 10 is connected to each other by a connection pipe 20, and each connection pipe 20 is provided with an on-off valve V1. The connecting pipe (20) is connected to the fluid pipe (30). The oil pipe (40) and the discharge pipe (50) are connected to the fluid pipe (30). An open / close valve (V2) (V3) is installed in the oil pipe (40) and the oil pipe (50) for controlling the inflow and outflow of the oil fluid, respectively.

Referring to FIG. 3, since the flexible bag is located at the seabed, it is greatly affected by the sea floor temperature. The water temperature at the seabed is about 5 ° C. Over time, the oil stored in the flexible bag eventually converges to the same temperature with the external sea water temperature (ambient temperature) and thermal equilibrium.

Referring to FIG. 4, crude oil produced is composed of a combination of various carbon composites. Some components produce hydrate and wax under a certain temperature condition. That is, over time, the oil stored in the flexible bag becomes hydrated with the external sea water temperature (ambient temperature) and converges to the same temperature, thus producing hydrate and wax.

Hydrate is a phenomenon in which hydrate crystals are formed and hardened in oil flow at high pressure and low temperature. Wax is attached to the outer wall of the subsea storage tank as the temperature of the paraffin component contained in the oil decreases. Phenomenon. When this phenomenon occurs, it is impossible to smoothly flow the stored oil, and the state of exporting can not be made.

In addition, it is necessary to periodically clean the hydrate and wax to remove it in a situation where it is difficult to remove the hydrate and the wax through the temperature control. However, since the submarine storage tank is located at the seabed, the maintenance cost is high because it is difficult to access.

Korean Patent Laid-Open No. 10-2010-0129959

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a hydrate and wax which circulate a high temperature oil into a heating pipe wound on the inner surface of a seabed storage tank, The present invention is directed to a submarine storage system and a method of operating the submarine storage system that have a heating function capable of reducing the maintenance cost due to periodic cleaning by suppressing generation of the submarine storage system.

To achieve the above object, the present invention provides a submarine storage system having a heating function and a method of operating the submarine storage system.

A submarine storage system having a heating function according to the present invention includes: a plurality of submarine storage tanks installed in a seabed and provided with a flexible bag for storing oil supplied from an oil well; And a heating pipe wound around the inner circumferential surface of each of the submarine storage tanks to heat the fluid stored in the flexible bag using a high temperature of oil supplied from the oil well.

The heating pipes wound around the inner peripheries of the seabed storage tanks are configured to be connected to each other.

Each of the seabed storage tanks is connected to each other by a connection pipe, and a fluid pipe is connected to the connection pipe, and the fluid pipe is connected to a oil pipe connected to the oil well and an oil supply pipe connected to a customer.

The oil pipe and the oil supply pipe may be provided with on-off valves for controlling the flow of oil, respectively.

According to another aspect of the present invention, there is provided a submarine storage tank comprising: a plurality of subsea storage tanks installed in a seabed and provided with a flexible bag for storing oil supplied from an oil well; And a heating pipe wound around the inner circumferential surface of each of the submarine storage tanks to heat the fluid stored in the flexible bag using the high temperature of the oil supplied from the oil well, Wherein the connecting pipe is connected to a fluid pipe and the fluid pipe is connected to a oil pipe connected to the oil well and to an oil supply pipe connected to the customer, the oil supplied from the oil well is stored in the flexible bag, A method for operating a submarine storage system for supplying oil stored in the flexible bag to a customer or heating a fluid stored in the flexible bag using high temperature of oil supplied from the oil well, To store the oil in the flexible bag The oil stored in the flexible bag is supplied to the customer through the oil supply pipe. If necessary, the oil stored in the flexible bag is heated using the high temperature of the oil supplied from the oil well, hydrate and wax.

Heated oil supplied from the oil well is transferred (circulated) through the heating pipe to heat the oil stored in the flexible bag.

As described above, according to the present invention, a high temperature oil produced in a well is used as a heat source to circulate a high temperature oil into a heating pipe wound around an inner surface of a seabed storage tank to produce a hydrate and a wax The maintenance cost due to periodic cleaning can be greatly reduced.

Further, according to the additional pipe configuration, filling and heating of the storage tank can be performed simultaneously.

1 is a plan view showing a conventional deep sea submarine storage tank and a transfer pipe;
2 is a longitudinal sectional view showing a conventional deep sea submarine storage tank
FIG. 3 is a graph showing changes in internal fluid temperature of the subsea storage tank with time
4 is a graph showing the generation of hydrate or wax in crude oil produced under the condition of a constant temperature or lower.
5 is a longitudinal sectional view showing a submarine storage tank having a heating function according to the present invention.
6 is a plan view showing a submarine storage system having a heating function according to the present invention.
7 is a graph showing the generation of hydrate or wax contained in oil by heating a flexible bag surrounded by a heating pipe using high heat of oil
8 is a plan view showing a method of operating a submarine storage system according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a submarine storage system having a heating function and a method for operating the submarine storage system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a vertical sectional view showing a submarine storage tank having a heating function according to the present invention, and FIG. 6 is a plan view showing a submarine storage system having a heating function according to the present invention.

5 and 6, a submarine storage system having a heating function according to the present invention includes a flexible bag 111 (see FIG. 5) for storing oil supplied from an oil well, A plurality of subsea storage tanks 110 installed therein; And a heating pipe 120 wound around each of the subsea storage tanks 110 to heat the fluid stored in the flexible bag 111 using the high heat of the oil supplied from the oil well.

The heating pipes 120 wound around the inner periphery of each seabed storage tank 110 are configured to be connected to each other. On the upper and lower portions of the heating pipe 120, open / close valves 121 and 122 for controlling the flow of oil are installed.

The shape and configuration of the heating pipe 120 may take various forms depending on the shape and configuration of the seabed storage tank 110, and the arrangement and the diameter should be selected in consideration of the required heat transfer efficiency.

Each heating pipe 120 is connected by a connecting pipe, and the connecting pipe is used for storing the fluid in which the heating is completed and the fluid is transferred to the submarine storage tank 110 required for heating. The construction and arrangement of the connecting pipe may be varied depending on the arrangement and configuration of the seabed storage tank 110 and may be configured in consideration of filling and export operations of the seabed storage tank 110.

Each of the seabed storage tanks 110 is connected to each other by a connection pipe 130. A fluid pipe 140 is connected to the connection pipe 130. The fluid pipe 140 includes a well pipe 150 connected to the well, And is connected to the oil supply pipe 160 connected to the customer. Here, the connection pipe 130 and the fluid pipe 140 may be configured separately, but may be integrally configured.

The connection pipe 130, the oil pipe 150 and the oil supply pipe 160 are provided with on-off valves 131, 151 and 161 for controlling the flow of oil, respectively.

The method of operating the submarine storage system according to the present invention is a method applied to the submarine storage system described above. The method of storing the oil supplied from the oil well into the flexible bag 111, The fluid stored in the flexible bag 111 can be heated by supplying the oil to the customer or using the high heat of the oil supplied from the oil well to prevent hydrate and wax generation.

7 is a graph showing the generation of hydrate or wax contained in oil by heating a flexible bag surrounded by a heating pipe by using high heat of oil.

Referring to FIG. 7, crude oil produced is composed of a combination of various carbon composites. Some components generate hydrate and wax under a certain temperature condition. That is, as time passes, the oil stored in the flexible bag 111 generates a hydrate and wax so as to converge to the same temperature by forming a thermal equilibrium state with the external seawater water temperature (ambient temperature).

In the present invention, the oil stored in the flexible bag 111 is heated by circulating the oil through the heating pipe 120 using the high heat of the oil supplied from the oil well, thereby effectively preventing hydrate and wax generation.

8 is a plan view showing a method of operating a submarine storage system according to the present invention.

Referring to FIG. 8, the present invention can simultaneously perform heating operation to store oil in the flexible bag 111 while preventing generation of hydrate or wax.

For example, ③, ④ when heating of subsea storage tank is required, ②, ⑤ when refilling oil in subsea storage tank, ⑤ after circulating high temperature oil through heating pipe (120) (4) It is possible to effectively prevent generation of hydrate and wax by allowing high-temperature oil to circulate through the heating pipe 120 installed in the seabed storage tank.

As described above, the high-temperature oil supplied from the oil well is transferred through the heating pipe 120 to heat the oil stored in the flexible bag 111 to prevent generation of hydrate wax contained in the oil, The maintenance cost can be greatly reduced.

In addition, according to the additional pipe configuration, filling and heating of the submarine storage tank can be performed simultaneously.

110: Submarine storage tank
111: Flexible Bag
120: Heating pipe
121, 122:
130: connecting pipe
140: fluid pipe
150: Oil well pipe
160: Oil supply pipe
131, 151, 161:

Claims (7)

A plurality of submarine storage tanks installed in the seabed and provided with flexible bags for storing oil supplied from an oil well; And
And a heating pipe wound around the inner periphery of each of the submarine storage tanks to heat the fluid stored in the flexible bag using the high heat of the oil supplied from the oil well. The method according to claim 1,
Wherein the heating pipes wound around the inner peripheries of the seabed storage tanks are connected to each other. The method according to claim 1,
Wherein each of the seabed storage tanks is connected to each other by a connecting pipe, a fluid pipe is connected to the connecting pipe, and the fluid pipe is connected to an oil pipe connected to the oil well and an oil supply pipe connected to a customer. Storage system. The method of claim 3,
Wherein the oil pipe and the oil supply pipe are each provided with an on-off valve for controlling the flow of oil. A plurality of submarine storage tanks installed in the seabed and provided with flexible bags for storing oil supplied from an oil well; And a heating pipe wound around the inner circumferential surface of each of the submarine storage tanks to heat the fluid stored in the flexible bag using the high temperature of the oil supplied from the oil well, Wherein the connecting pipe is connected to a fluid pipe and the fluid pipe is connected to a oil pipe connected to a oil well and to an oil supply pipe connected to a customer, the oil supplied from the oil well is stored in the flexible bag, (EN) A method of operating a submarine storage system that supplies oil stored in a flexible bag to a customer or heats a fluid stored in the flexible bag using high heat of oil supplied from a well,
The oil in the flexible bag is transported through the oil pipe to store the oil in the flexible bag, and the oil stored in the flexible bag is supplied to the customer through the oil supply pipe. If necessary, Wherein the fluid stored in the flexible bag is heated to prevent generation of hydrate or wax contained in the oil. The method of claim 5,
Wherein the high temperature oil supplied from the oil well is transferred through the heating pipe to heat the oil stored in the flexible bag. The oil is transported through the oil pipe to store the oil in the flexible bag of the seabed storage tank and the oil stored in the flexible bag is supplied to the customer through the oil supply pipe and the oil supplied from the oil well A method of operating an undersea storage system for heating a fluid stored in the flexible bag using high temperature to prevent hydrate or wax formation in the oil.
KR1020150125516A 2015-09-04 2015-09-04 Operation method of sub-sea storage system having heating function and the sub-sea storage system KR20170028648A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107235250A (en) * 2017-07-24 2017-10-10 苏州市金翔钛设备有限公司 A kind of highly effective reaction feed liquid heating-up mechanism
NO20180964A1 (en) * 2018-07-09 2020-01-10 Subsea 7 Norway As Subsea fluid storage unit
WO2020011727A1 (en) 2018-07-09 2020-01-16 Subsea 7 Norway As Subsea fluid storage unit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100129959A (en) 2009-06-02 2010-12-10 한국과학기술원 Subsea carbon dioxide storage equipment using deformable bags

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100129959A (en) 2009-06-02 2010-12-10 한국과학기술원 Subsea carbon dioxide storage equipment using deformable bags

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107235250A (en) * 2017-07-24 2017-10-10 苏州市金翔钛设备有限公司 A kind of highly effective reaction feed liquid heating-up mechanism
NO20180964A1 (en) * 2018-07-09 2020-01-10 Subsea 7 Norway As Subsea fluid storage unit
WO2020011727A1 (en) 2018-07-09 2020-01-16 Subsea 7 Norway As Subsea fluid storage unit
US11891241B2 (en) 2018-07-09 2024-02-06 Subsea 7 Norway As Subsea fluid storage unit

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