Salt cavern energy storage water-soluble cavity forming string and cavity forming device

Abstract

The application discloses a salt cavern energy storage water-soluble cavity forming pipe column and a cavity forming device, and belongs to the technical field of salt cavern storage. The salt cavern energy storage water-soluble cavity forming pipe column comprises a pipe body and an outlet joint; the outlet joint is arranged at one side port of the pipe body, and 2N liquid outlets are arranged on the outlet joint at equal intervals; the angle between the axis of the 2N liquid outlets and the axis of the pipe body ranges from 0 to 90 degrees, wherein N is a positive integer. The salt cavern energy storage water-soluble cavity forming pipe column and the cavity forming device can effectively suppress the liquid-solid coupling vibration of the cavity forming pipe column, thereby reducing the risk of excessive bending deformation and damage and fracture of the cavity forming pipe column.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of salt cavern storage, and particularly relates to a salt cavern energy storage water-soluble cavity forming pipe column and a cavity forming device. BACKGROUND

[0002] The single-well oil pad convection method water-soluble mining process is generally used in the construction of salt cavern storage in a salt rock stratum. However, in the process of water-soluble cavity forming and later operation of the salt cavern energy storage, engineering accidents such as excessive bending or fracture of the pipe column caused by liquid-solid coupling vibration of the cavity forming pipe column often occur, especially the last few cavity forming pipe columns inside the salt cavity. Therefore, it is particularly important to suppress the liquid-solid coupling vibration of the cavity forming pipe column, which can effectively avoid engineering accidents of the cavity forming pipe column and improve the cavity forming efficiency of the salt cavern storage. SUMMARY

[0003] The application provides a salt cavern energy storage water-soluble cavity forming pipe column and a cavity forming device, which aims to at least solve the technical problem of excessive bending or fracture accidents caused by liquid-solid coupling vibration of the cavity forming pipe column of the salt cavern storage. To this end,

[0004] In one aspect of the embodiment of the application, a salt cavern energy storage water-soluble cavity forming pipe column is provided, which comprises a pipe body and an outlet joint.

[0005] The outlet joint is arranged at one side port of the pipe body, and 2N liquid outlets are arranged at equal intervals on the outlet joint, the angle between the axis of the 2N liquid outlets and the axis of the pipe body ranges from 0° to 90°, where N is a positive integer.

[0006] In some embodiments, the number of liquid outlets is two, and the two liquid outlets are symmetrical about the central axis of the pipe body.

[0007] In some embodiments, the number of liquid outlets is four, and the four liquid outlets are arranged at equal intervals on the circumferential side of the pipe body.

[0008] In some embodiments, the angle between the axis of the liquid outlet and the axis of the pipe body is 90°.

[0009] In some embodiments, the outlet joint comprises a plurality of flow guide branch pipes arranged at intervals, one end of the flow guide branch pipe communicates with the pipe body, and the other end is arranged as the liquid outlet.

[0010] In some embodiments, the number of flow guide branch pipes is two, and the two flow guide branch pipes are symmetrical about the central axis of the pipe body.

[0011] In some embodiments, the number of flow guide branch pipes is four, and the four flow guide branch pipes are arranged at equal intervals on the circumferential side of the pipe body.

[0012] In some embodiments, the included angle between the axis of the flow guide branch pipe and the axis of the pipe body is 45°.

[0013] In another aspect of the embodiments of the present application, a salt cavern energy storage water-soluble cavity forming device is provided, which comprises the salt cavern energy storage water-soluble cavity forming pipe column.

[0014] The present application has at least the following beneficial effects:

[0015] The salt cavern energy storage water-soluble cavity forming pipe column and the cavity forming device provided by the embodiments of the present application can form an outlet flow channel in the radial direction of the pipe column by setting an outlet joint at the outlet end of the cavity forming pipe column and spacing an even number of liquid outlets on the outlet joint and communicating with the cavity forming pipe column, and setting the included angle between the axis of the liquid outlet and the axis of the pipe column to be 0-90 degrees, so as to improve the critical flow velocity of the cavity forming pipe column to a certain extent by the reaction force of the fluid after changing direction, thereby improving the flutter instability accident of the cavity forming pipe column caused by liquid-solid coupling vibration, and reducing the risk of excessive bending, damage and fracture of the cavity forming pipe column. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A structure diagram of a first structure of a salt cavern energy storage water-soluble cavity forming pipe column in the embodiments of the present application is shown;

[0018] Figure 2 A structure diagram of a second structure of a salt cavern energy storage water-soluble cavity forming pipe column in the embodiments of the present application is shown;

[0019] Figure 3 A structure diagram of a third structure of a salt cavern energy storage water-soluble cavity forming pipe column in the embodiments of the present application is shown;

[0020] Figure 4 A structure diagram of a fourth structure of a salt cavern energy storage water-soluble cavity forming pipe column in the embodiments of the present application is shown;

[0021] Figure 5 A structure diagram of a salt cavern energy storage water-soluble cavity forming device in the embodiments of the present application is shown.

[0022] Reference signs:

[0023] 100 - pipe string, 200 - outlet fitting, 210 - outlet, 220 - flow guide branch, 300 - cavity- forming outer pipe, 400 - production casing, 500 - bare well, 600 - oil pad, 700 - salt cavern. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0025] In addition, reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0026] The present application will be described below in combination with the drawings and with reference to specific embodiments:

[0027] The single-well oil pad convection method is generally used for water-soluble mining process in the construction of salt cavern energy storage in salt rock strata. However, during the water-soluble cavity forming and later operation of the salt cavern energy storage, engineering accidents such as excessive bending or fracture of the cavity-forming pipe string caused by liquid-solid coupling vibration of the cavity-forming pipe string often occur. Therefore, the present application improves the structure of the cavity-forming pipe string to a certain extent, improves the critical flow velocity of the cavity-forming pipe string when the vibration instability occurs, and further improves the difficulty of liquid-solid coupling vibration instability of the cavity-forming pipe string, thereby reducing the risk of excessive bending and loss of fracture of the pipe string.

[0028] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the salt cavern energy storage water-soluble cavity-forming pipe string provided by the embodiments of the present application comprises: a pipe body 100 and an outlet fitting 200.

[0029] The pipe body 100 is used for passing fluid medium, and the lower end port is used for communicating with the fluid medium in the salt cavern 700. In order to improve the critical flow velocity of the cavity forming pipe column to occur flutter instability, the outlet joint 200 can be arranged at a side port of the pipe body 100, such as a bottom port in the salt cavern 700, and 2N liquid outlets 210 are arranged on the outlet joint 200 at equal intervals, and the axes of the 2N liquid outlets 210 are arranged to have an angle range of 0°-90° with the axis of the pipe body 100, so that the fluid medium passing through the pipe body 100 changes direction, at least to a certain extent, and the vibration of the pipe body 100 is buffered by the fluid reaction force, so that the ability to resist flutter instability of the cavity forming pipe column can be improved. That is, through the flow direction changing design of the cavity forming pipe column, the critical flow velocity of flutter instability can be improved on the basis of the pipe body 100, that is, the bearing capacity of the critical velocity of liquid-solid coupled vibration of the pipe body 100 is expanded, and the risk of flutter instability is reduced.

[0030] On the other hand, the 2N liquid outlets 210 are arranged at equal intervals on the circumferential side of the outlet joint 200, so that the output fluid medium flow is basically consistent, the reaction force on the pipe body 100 is equivalent, and the radial component size is consistent and uniformly points to the central axis, and is mutually offset, thereby keeping the radial force stable, so that the reliable radial buffering effect can be maintained to a certain extent.

[0031] Referring to Figure 1 In some embodiments, the number of liquid outlets 210 is two, and the two liquid outlets 210 are symmetrical about the central axis of the pipe body 100, so that the reaction force on the pipe body 100 can be offset by the symmetrically arranged flow channels, and has a certain performance of buffering the radial swing of the pipe body 100, thereby inhibiting the influence of pipe body vibration.

[0032] In some embodiments, the number of liquid outlets 210 can also be four, and the four liquid outlets 210 are arranged at equal intervals on the circumferential side of the pipe body 100.

[0033] In some embodiments, the angle between the axis of the liquid outlet 210 and the axis of the pipe body 100 is 90°, so that a better liquid-solid coupled vibration suppression effect is obtained.

[0034] Generally, the liquid-solid coupled vibration suppression effect is positively correlated with the angle between the axis of the liquid outlet 210 and the axis of the pipe body 100, that is, the larger the angle, the better the liquid-solid coupled vibration suppression effect, so it can be flexibly set according to the actual structure formability, process requirements and other factors.

[0035] In the case that the liquid outlet 210 is arranged at the circumferential side of the outlet joint 200, the end of the outlet joint 200 away from the pipe body 100 is closed, so that the output fluid medium can be discharged through the liquid outlet 210, so that the flow direction of the output fluid medium is changed, and at least to some extent, the vibration of the pipe body 100 is buffered by the fluid reaction force, so that the ability to resist the whirling instability of the cavity-forming pipe string can be improved; that is, through the flow channel turning design of the cavity-forming pipe string, the critical flow velocity of whirling instability is improved on the basis of the pipe body 100, that is, the bearing capacity of the critical velocity of the liquid-solid coupled vibration of the pipe body 100 is improved, and the risk of whirling instability is reduced.

[0036] Referring to Figure 3 and Figure 4 In some embodiments, the outlet joint 200 can further include a plurality of flow guide branch pipes 220 arranged at intervals, one end of the flow guide branch pipe 220 being in communication with the pipe body 100, and the other end being arranged as the liquid outlet 210.

[0037] That is, by the flow guide branch pipe 220, the fluid medium flowing out of the pipe body 100 is divided and guided, and then enters the salt cavern after a certain distance from the pipe body 100, so that the jet flow exported can maintain a certain distance from the pipe body 100, avoiding the impact of the violently fluctuating and splashing fluid medium on the pipe body 100.

[0038] In some embodiments, the number of flow guide branch pipes 220 can also be two, and the two flow guide branch pipes 220 are symmetrical about the central axis of the pipe body 100.

[0039] In some embodiments, the number of flow guide branch pipes 220 can also be four, and the four flow guide branch pipes 220 are arranged at equal intervals on the circumferential side of the pipe body 100.

[0040] In some embodiments, the angle between the axis of the flow guide branch pipe 220 and the axis of the pipe body 100 can be 45°, 30°, or 60°.

[0041] In some embodiments, the number of liquid outlets 210 or flow guide branch pipes 220 can also be six or eight, etc., which is not specifically limited here and can be flexibly arranged.

[0042] Referring to Figure 5 In another aspect of the embodiments of the present application, a water-soluble cavity-forming device for a salt cavern energy storage is provided, which includes the above-mentioned water-soluble cavity-forming pipe string for a salt cavern energy storage, and specifically includes: a cavity-forming outer pipe 300, a cavity-forming pipe string (inner pipe), a bare well 500, a production casing 400, an oil pad 600, and a salt cavern 700, wherein the lower end (medium output end) of the cavity-forming pipe string extends into the salt cavern 700 to input fluid medium into the salt cavern 700.

[0043] The pipe material and model of the cavity-forming outer pipe 300 and the pipe body 100 (inner pipe) are consistent with the field use. The single pipe length of the cavity-forming outer pipe 300 and the pipe body 100 is normally 20 m, each single pipe is connected to each other by a male and female bolt to form a pipe joint between adjacent single pipes. In order to match the total length of the cavity-forming pipe column with the target formation depth of the cavity, the pipe section near the wellhead on the ground can use a short pipe column with a length of 2-5 m, and other parameters are the same as the normal pipe column with a length of 20 m.

[0044] The lower end of the pipe column 100 is a free end, the outlet 210 or the flow guide branch pipe 220 forms an included angle θ with the central axis of the pipe body 100, and the value of θ is in the range of 0°-90°, and the value of θ can be selected according to actual needs. The greater the value of the included angle θ, the better the liquid-solid coupling vibration suppression effect of the cavity-forming pipe column, the greater the critical flow velocity of the cavity-forming pipe column to cause flutter instability, and even unable to cause flutter instability.

[0045] It should be noted that, during assembly, the single pipe of the cavity-forming inner pipe containing the outlet joint 200 is lowered first.

[0046] In still another aspect of the embodiments of the present application, a water-soluble cavity-forming device for a salt cavern energy storage is provided.

[0047] During construction, fresh water or brine flows into the pipe body 100 through the outlet joint 200, and then flows out of the outlet 210 or the flow guide branch pipe 220 into the salt cavern 700, and then the brine is output through the cavity-forming outer pipe 300, the oil pad 5 is used to limit the upward dissolution of salt rock to control the shape of the cavity, and this process is called a positive circulation cavity-forming mode.

[0048] Or the cavity-forming outer pipe 300 flows into fresh water or brine, enters the pipe body 100 through the outlet joint 200, and the pipe body 100 outputs brine, and this process is called a reverse circulation cavity-forming mode.

[0049] The positive circulation cavity-forming mode and the reverse circulation cavity-forming mode are alternately used to form the final energy storage salt cavern 700.

[0050] The embodiments of the present application have at least the following beneficial effects:

[0051] The salt cavern energy storage reservoir water dissolving cavity pipe column and cavity forming device provided by the embodiments of the present application can form an outlet flow channel in the radial direction of the pipe column by setting an outlet joint at the outlet end of the cavity forming pipe column, and setting an even number of liquid outlets on the outlet joint in communication with the cavity forming pipe column, and setting the angle between the axis of the liquid outlet and the axis of the pipe column to be 0-90 degrees, so as to improve the critical flow velocity of the cavity forming pipe column to a certain extent by the reaction force of the fluid after changing direction, thereby improving the flutter instability accident of the cavity forming pipe column caused by liquid-solid coupling vibration, and reducing the risk of excessive bending, damage and fracture of the cavity forming pipe column.

[0052] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0054] It should be noted that all directional indications, e.g., "upper," "lower," "front," "back," "side," "end," "upper," "lower," "up," "down," "clockwise," "counter clockwise," "first," "second," "third," "top," "bottom," "horizontal," "vertical," "left," "right," "indicate relative positions and orientations of the components, movements, etc. in a particular position, and if the particular position changes, the directional indications will also change accordingly. In this application, unless specifically stated and limited otherwise, the terms "connect," "fixed," and the like, should be given their broadest meaning, for example, "fixed" can be fixed connections, or detachable connections, or integral; can be mechanical or electrical connections; can be direct or indirect connections, or two elements internal communication or interaction between the two elements, unless otherwise expressly limited. For ordinary skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the description in this application such as "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise expressly limited.

[0055] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0056] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not in the protection scope required by the present application.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. A salt cavern energy storage reservoir water-soluble cave-in pipe string, characterized by, The utility model relates to a salt cave energy storage water solution cavity tube column, comprising: a tube body and an outlet joint; the outlet joint is arranged at a side port of the tube body, and 2N liquid outlets are arranged at the outlet joint at equal intervals, the angle between the axis of the 2N liquid outlets and the axis of the tube body ranges from 0 to 90 degrees, so that the flow direction of the fluid medium passing through the tube body is changed, wherein N is a positive integer; the liquid outlets are arranged at the circumferential side of the outlet joint, and the end of the outlet joint away from the tube body is closed; the lower end of the tube body is a free end.

2. The salt cavern energy reservoir hydrofracing string of claim 1, wherein, the number of the liquid outlets is two, and the two liquid outlets are symmetrical about the central axis of the tube body.

3. The salt cavern energy reservoir hydrofracing string of claim 1, wherein, the number of the liquid outlets is four, and the four liquid outlets are arranged at the circumferential side of the tube body at equal intervals.

4. The salt cavern energy reservoir hydrofracing string of claim 2 or 3, wherein, the angle between the axis of the liquid outlet and the axis of the tube body is 90 degrees.

5. The salt cavern energy reservoir hydrofracing string of claim 1, wherein, the outlet joint comprises a plurality of flow guide branch pipes arranged at intervals, one end of the flow guide branch pipe communicates with the tube body, and the other end is arranged as the liquid outlet.

6. The salt cavern energy reservoir hydrofracing string of claim 5, wherein, the number of the flow guide branch pipes is two, and the two flow guide branch pipes are symmetrical about the central axis of the tube body.

7. The salt cavern energy reservoir hydrofracing string of claim 5, wherein, the number of the flow guide branch pipes is four, and the four flow guide branch pipes are arranged at the circumferential side of the tube body at equal intervals.

8. The salt cavern energy reservoir hydrofracing string of claim 6 or 7, wherein, the angle between the axis of the flow guide branch pipe and the axis of the tube body is 45 degrees.

9. A water-soluble caverning apparatus for a salt cavern energy storage repository, comprising: the utility model relates to a salt cave energy storage water solution cavity tube column.

Images