CN111874468B

CN111874468B - Underwater oil-gas storage device

Info

Publication number: CN111874468B
Application number: CN202010821001.8A
Authority: CN
Inventors: 王志文; 童郑人; 董欣; 王虎; 熊伟; 王金舜
Original assignee: Dalian Maritime University
Current assignee: Dalian Maritime University
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2021-10-29
Anticipated expiration: 2040-08-14
Also published as: CN111874468A

Abstract

The invention provides an underwater oil gas storage device, which comprises an oil gas storage shell, a platform, a flexible diaphragm recovery device and a flexible diaphragm, wherein the platform is arranged on the oil gas storage shell; the inner wall of the shell of the oil-gas reservoir is coated with an inner isolation layer of the oil-gas reservoir, and the lower part of the shell is provided with a lower-end water through hole; the platform is detachably arranged at the top opening of the oil and gas reservoir shell; the flexible diaphragm is positioned inside the oil and gas reservoir shell; the platform is provided with an upper end limber hole and an oil gas transportation pipeline interface; the flexible diaphragm recovery device is fixed on the platform and extends into the flexible diaphragm; the flexible diaphragm recovery device comprises an inner pipe, a fixed handle, a rope and an outer pipe; a channel is arranged in the center of the inner tube, one end of the rope is fixed at the bottom of the flexible diaphragm, and the other end of the rope penetrates through the channel and extends out of the inner tube; the inner wall of the outer pipe is provided with a sliding rail, and the outer wall of the inner pipe is provided with a clamping groove. The technical scheme of the invention solves the problems of high economic cost, potential safety hazard and the like of the existing oil-gas storage mode.

Description

Underwater oil-gas storage device

Technical Field

The invention relates to the technical field of oil and natural gas storage, in particular to an underwater oil and gas storage device.

Background

At present, the main storage method of petroleum and natural gas is underground gas storage or compressed storage using tank containers, such as ground oil storage, liquefied gas storage and compressed gas storage.

The underground gas storage has higher requirements on geological conditions, and areas meeting the storage building conditions are fewer and far away from consumption areas of petroleum and natural gas, so that the economic cost and the technical difficulty of building the storage are higher, and potential safety hazards can be brought to the underground gas storage. The liquefied gas storage tank occupies expensive land resources, has high economic cost and serious potential safety hazard, and is unsuitable for storing partial energy resources by using the liquefied gas storage tank. The compressed gas storage tank has small gas storage scale and potential safety hazard. Particularly for economically developed cities on islands and coastal areas, the ground and underground storage have certain problems, and the requirements on geological and land resources are higher.

Disclosure of Invention

According to the technical problems that the existing oil gas storage mode is high in economic cost and has potential safety hazards and the like, the underwater oil gas storage device is provided. The invention utilizes the underwater device to store oil and gas resources on the seabed, thereby avoiding the problems related to land address resources and greatly improving the safety.

The technical means adopted by the invention are as follows:

an underwater oil gas storage device comprises an oil gas storage shell, a platform, a flexible diaphragm recovery device and a flexible diaphragm;

the inner wall of the shell of the oil-gas reservoir is coated with an inner isolation layer of the oil-gas reservoir, and the lower part of the shell is provided with a lower-end water through hole; the top of the oil and gas reservoir shell is provided with an opening, and the platform is detachably arranged at the opening; the flexible diaphragm is positioned inside the oil and gas reservoir shell, and the top of the flexible diaphragm is fixedly arranged on the platform;

the platform is provided with an upper end water through hole and an oil gas transportation pipeline interface, the upper end water through hole is communicated with the inner side and the outer side of the oil gas reservoir shell, one end of the oil gas transportation pipeline interface is communicated with an external gas pipeline, and the other end of the oil gas transportation pipeline interface is communicated to the inside of the flexible diaphragm;

the flexible diaphragm recovery device is fixed on the platform and extends into the flexible diaphragm; the flexible diaphragm recovery device comprises an inner pipe, a fixed handle, a rope and an outer pipe; a channel is arranged in the center of the inner tube, one end of the rope is fixed at the bottom of the flexible diaphragm, and the other end of the rope penetrates through the channel and extends out of the inner tube; the inner wall of the outer pipe is provided with a sliding rail, the outer wall of the inner pipe is provided with a clamping groove, and the inner pipe and the outer pipe are connected in a sliding mode through a sliding block arranged between the sliding rail and the clamping groove; the top of the outer pipe is provided with a limiting structure; the fixed handle is fixed at the top of the outer tube; the rubber ring is arranged at the bottom of the outer pipe.

Furthermore, the limiting structures are through holes symmetrically formed in the top of the outer pipe.

Further, the limiting structure, the rope and the fixed handle are used for connecting an external manipulator when the flexible diaphragm needs to be recovered.

Further, the inside isolation layer of the oil and gas reservoir adopts JS composite waterproof paint.

Further, the bottom of the platform is provided with a fixing clamping groove for fixing the flexible diaphragm.

Compared with the prior art, the invention has the following advantages:

1. according to the underwater oil gas storage device, the underwater gas storage is used for storing oil or natural gas at the sea bottom, so that precious land resources are prevented from being occupied; the gas storage is arranged near the sea, so that the distance from the gas storage to the main energy consumption area is short, and the economic value is high; the submarine to-be-developed degree is high, and a large number of high-quality reservoir building areas exist; the gas storage is located on the seabed, and has little influence on the work and life of human beings.

2. The underwater oil gas storage device provided by the invention has the advantages that the gas storage film can deform along with the gas storage amount in the device by utilizing the pressure, and the potential safety hazard of a gas storage reservoir is reduced.

3. The underwater oil gas storage device provided by the invention can realize one-time installation and recovery of the related device of the gas storage membrane, and can quickly maintain and replace the related device of the gas storage membrane.

Based on the reasons, the invention can be widely popularized in the fields of oil and natural gas storage and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the subsea hydrocarbon storage device of the present invention.

FIG. 2 is a schematic view of the process of gas storage into the subsea hydrocarbon storage device of the present invention.

FIG. 3 is a schematic view of the out-gassing process of the subsea hydrocarbon storage device of the present invention.

FIG. 4 is a schematic view of the external structure of the subsea hydrocarbon storage device of the present invention.

FIG. 5 is a perspective view of the subsea hydrocarbon storage device of the present invention.

Fig. 6 is a schematic structural diagram of the flexible diaphragm recovery device.

Fig. 7 is a schematic structural view of the outer tube.

Fig. 8 is a schematic view of the inner tube structure.

In the figure: 1. a water through hole at the lower end; 2. an oil and gas reservoir housing; 3. an oil and gas reservoir internal isolation layer; 4. a platform; 5. an oil gas transportation pipeline interface; 6. a flexible diaphragm recovery device; 7. a water through hole is arranged at the upper end; 8. fixing the clamping groove; 9. an inner tube; 10. a limiting structure; 11. fixing a handle; 12. an outer tube; 13. a rubber ring; 14. a slide rail; 15. a slider; 16. a channel; 17. a card slot; 18. a flexible diaphragm.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

Example 1

As shown in fig. 1-8, the present invention provides a subsea hydrocarbon storage device comprising a hydrocarbon reservoir housing 2, a platform 4, a flexible membrane recovery device 6, and a flexible membrane 18;

the inner wall of the oil-gas reservoir shell 2 is coated with an oil-gas reservoir inner isolation layer 3, and the lower part of the oil-gas reservoir inner isolation layer is provided with a lower end limber hole 1; the oil and gas reservoir internal isolation layer 3 is used for preventing water and leakage, and meanwhile, the friction between the flexible diaphragm 18 and the inner wall of the oil and gas reservoir shell 2 can be reduced due to the fact that the surface of a coating is smooth;

the top of the oil and gas reservoir shell 2 is provided with an opening, and the platform 4 is detachably arranged at the opening; the flexible diaphragm 18 is positioned inside the oil and gas reservoir shell 2, and the top of the flexible diaphragm is fixedly arranged on the platform 4;

the platform 4 is provided with an upper end limber hole 7 and an oil gas transportation pipeline interface 5, the upper end limber hole 7 is communicated with the inner side and the outer side of the oil gas reservoir shell 2, one end of the oil gas transportation pipeline interface 5 is communicated with an external gas transportation pipeline, and the other end of the oil gas transportation pipeline interface is communicated with the inside of the flexible diaphragm 18; the external gas transmission pipeline is used for transmitting oil gas to be stored;

the flexible diaphragm recovery device 6 is fixed on the platform 4 and extends into the flexible diaphragm 18; the flexible diaphragm recovery device 6 comprises an inner tube 9, a fixed handle 11, a rope and an outer tube 12; a channel 16 is arranged in the center of the inner tube, one end of the rope is fixed at the bottom of the flexible diaphragm 18, and the other end of the rope penetrates through the channel 16 and extends out of the inner tube 9; the inner wall of the outer pipe 12 is provided with a sliding rail 14, the outer wall of the inner pipe 9 is provided with a clamping groove 17, and the inner pipe 9 and the outer pipe 12 are connected in a sliding mode through a sliding block 15 arranged between the sliding rail and the clamping groove 17; the top of the outer tube 12 is provided with a limiting structure 10; the fixed handle 11 is fixed on the top of the outer tube 12; the rubber ring 13 is arranged at the bottom of the outer tube 12, and the rubber ring 13 can reduce the damage of the flexible diaphragm 18 caused by the abrasion between the flexible diaphragm 18 and the outer tube 12.

Further, the limiting structure 10 is a through hole symmetrically disposed at the top of the outer tube 12.

Further, the retaining structure 10, the rope and the fixed handle 11 are used to connect an external robot when the flexible membrane 18 needs to be recovered.

Further, the oil and gas reservoir internal isolation layer 3 is made of JS composite waterproof paint.

Further, a fixing clamping groove 8 for fixing the flexible diaphragm 18 is arranged at the bottom of the platform 4.

In the underwater oil and gas storage device, the upper end limber hole 7 is a through hole on the platform 4 and is communicated with the inside of the oil and gas reservoir shell 2 and the outside seawater, and the upper end limber hole 7 is provided with a sealing cover and can be manually unscrewed; when the flexible diaphragm 18 needs to be recovered, the upper end limber hole 7 is opened, so that the flexible diaphragm 18 is communicated with the top of the oil and gas reservoir and the external seawater, the pressure difference between the upper side and the lower side of the flexible diaphragm 18 is eliminated, and the recovery of the flexible diaphragm 18 is facilitated;

when oil gas is stored in the underwater oil gas storage device, the pressure of oil gas on the inner side of the flexible diaphragm 18 is balanced with the pressure of a seawater contact surface on the outer side of the flexible diaphragm 18 by using the deepwater hydrostatic pressure and the variability characteristic of the flexible diaphragm 18, seawater is separated from oil gas by the flexible diaphragm 18, the form of the flexible diaphragm 18 is changed along with the change of the oil gas storage amount in the flexible diaphragm 18, the internal pressure and the external pressure of the device are kept balanced all the time, the device does not belong to a pressure container, and the underwater oil gas storage device can be stable and safe, and effectively prevent safety accidents caused by large internal and external pressure difference in the oil gas storage process.

Oil and gas storage process: as shown in fig. 2, the lower end limber hole 1 is opened to allow seawater inside and outside the oil and gas reservoir to flow through, when oil and gas outside are introduced into the storage space formed inside the flexible diaphragm 18 through an external gas transmission pipeline, the pressure inside the diaphragm is increased, the flexible diaphragm 18 is expanded downward under the action of the pressure difference, and at this time, water is discharged outward through the lower end limber hole 1.

The oil and gas reservoir device works through the balance acting force of the internal pressure of the flexible diaphragm and the seawater pressure in the oil and gas reservoir, so that the lower end limber hole 1 needs to be opened all the time.

Oil gas release process: as shown in fig. 3, when oil gas is taken, the oil gas inside the flexible diaphragm 18 flows out of the oil gas reservoir through an external gas transmission pipeline, the pressure inside the flexible diaphragm 18 is reduced, the seawater pressure outside the flexible diaphragm 18 is higher, the flexible diaphragm 18 contracts under the action of the pressure difference, and at this time, the lower end limber hole 1 enters water inwards.

On this basis, this application the condition that need change when flexible diaphragm 18 is damaged or reaches service life has been considered emphatically to the oil and gas storage device under water, has designed flexible diaphragm recovery unit 6 has realized under the circumstances of not destroying oil gas storehouse exterior structure to flexible diaphragm 18's whole change.

Recovery of the flexible membrane 18: firstly, pumping oil and gas in the oil and gas reservoir, and simultaneously opening the upper end limber hole 7 to enable seawater to exist between the flexible diaphragm 18 and the upper part of the oil and gas reservoir; the external manipulator lifts the inner tube 9 upwards through the limiting structure 10, at the moment, a cavity is formed between the inner tube 9 and the outer tube 12 due to the fact that the inner tube 9 is lifted to a certain height, the rope is connected and pulled through the external manipulator, the flexible diaphragm 18 can be contracted to enter the cavity under the action of tensile force, when the flexible diaphragm 18 is completely recovered, one part of the flexible diaphragm 18 is contracted in the cavity, and the other part of the flexible diaphragm 18 is tightly attached to the outer side of the outer tube 12.

After the flexible diaphragm 18 is completely contracted, the flexible diaphragm recovery device 6 and the platform 4 can be recovered together by fixing the flexible diaphragm 18 and the fixed handle 11 through an external connecting hand.

In consideration of the similar physical and chemical properties of natural gas and hydrogen as fuels, the underwater oil and gas storage device can be used for underwater hydrogen storage and can be used as an alternative scheme for large-scale storage of future hydrogen energy.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underwater oil gas storage device is characterized by comprising an oil gas storage shell, a platform, a flexible diaphragm recovery device and a flexible diaphragm;

2. The subsea hydrocarbon storage device of claim 1, wherein the limiting structures are through holes symmetrically disposed at the top of the outer pipe.

3. The subsea hydrocarbon storage device of claim 1, wherein the retention structure, the tether, and the fixed handle are configured to connect to an external robot when the flexible membrane needs to be recovered.

4. The subsea hydrocarbon storage device of claim 1, wherein the isolation layer inside the hydrocarbon reservoir is a JS composite waterproof coating.

5. The subsea hydrocarbon storage device of claim 1, wherein a retaining groove is provided in the bottom of the platform for retaining the flexible membrane.