Water-sealed cavern vertical shaft casing installation structure

Abstract

This utility model provides a casing installation structure for a water-sealed cavern shaft, including a cement plug fixed to the side wall of the shaft. A guide pipe is vertically fixed inside the cement plug, and a first flange is fixed to one end of the guide pipe, which is also fixed to the end of the cement plug. A casing body is also provided inside the guide pipe, with both the upper and lower ends of the casing body extending out of the guide pipe. A second flange is also fixedly fitted onto the casing body, and the second flange is detachably and sealingly connected to the first flange. Using this utility model, when the casing becomes corroded or damaged, the second flange can be removed from the first flange, allowing for replacement of both the second flange and the casing body without the need for reconstructing other facilities within the shaft, thus saving maintenance costs. The first and second flanges constrain the vibration and deflection of the casing body, ensuring its stability and the seal between the casing body and the cement plug.

Description

Technical Field

[0001] This utility model relates to the field of water-sealed cavern technology, specifically to a vertical shaft casing installation structure for water-sealed caverns. Background Technology

[0002] Underground water-sealed caverns are a special type of underground engineering structure used to store crude oil, refined oil products, and other materials. Their construction requires extremely high standards in terms of geological conditions and construction techniques. The installation of vertical shaft equipment and pipelines is crucial, serving as a key channel connecting the surface and underground storage spaces. Various equipment and the intricate pipeline system are all arranged and operated through these shafts.

[0003] The casing in a shaft is the only channel connecting the underground storage tank to the surface piping system. Its installation requires high precision, ensuring both the casing can withstand irregular vibrations from the internal fluids and remain upright, while also maintaining a tight seal between its outer wall and the cement plug within the shaft. Due to the weight of the casing itself and its internal suspended equipment and pipes, it is typically fixed to the cement plug during installation. However, when the casing becomes corroded or damaged, it cannot be replaced, necessitating the reconstruction of the entire shaft, which is extremely costly.

[0004] Patent document CN204851267U discloses a casing anchoring device for water-sealed caverns. This device strengthens the connection between the casing and the cement seal by setting a reinforcing plate structure anchoring band on the side of the casing. However, this device does not solve the aforementioned problem. Utility Model Content

[0005] To solve at least one of the above technical problems, this utility model provides a water-sealed cavern shaft casing installation structure.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a casing installation structure for a water-sealed cavern shaft, including a cement plug fixed to the side wall of the shaft, a guide pipe vertically fixed inside the cement plug, a first flange fixed to one end of the guide pipe, the first flange being fixed to the end of the cement plug; a casing body is also provided inside the guide pipe, with both the upper and lower ends of the casing body extending out of the guide pipe, and a second flange fixedly fitted on the casing body, the second flange being detachably and sealingly connected to the first flange.

[0007] The beneficial effects of this utility model are: By employing this utility model, when the casing becomes corroded or damaged, the second flange can be removed from the first flange, allowing for the replacement of both the second flange and the casing body. This eliminates the need for reconstructing other facilities within the shaft, saving maintenance costs. The first and second flanges constrain the vibration and deflection of the casing body, ensuring its stability and the seal between the casing body and the cement plug. Furthermore, the first flange and guide pipe can be pre-embedded and cast into the cement plug, resulting in high installation strength, resistance to damage, and reliable fixation of the casing body.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, both ends of the guide tube are fixed with a first flange; the upper and lower parts of the sleeve body are both fixedly fitted with a second flange.

[0010] This facilitates the constraint of both the upper and lower parts of the casing body, thereby improving the stability of the casing body.

[0011] Furthermore, multiple mounting studs are fixed on the first flange, the mounting studs penetrate the second flange and are connected to nuts; the first flange extends at least partially into the cement seal.

[0012] The second flange is connected to the first flange by multiple mounting studs, which makes disassembly and assembly convenient and provides a strong connection.

[0013] Furthermore, it also includes a sealing cylinder, one end of which is sealed to the outer wall of the sleeve body, and the other end of which is sealed to the edge of the first flange; the second flange is located inside the sealing cylinder.

[0014] This design facilitates the enclosure of the mounting studs within a sealed flexible cylinder for protection, preventing corrosion and extending the service life of both the first flange and the mounting studs.

[0015] Furthermore, a first anchoring rib is fixed to the outside of the guide tube. Multiple first anchoring ribs are provided and distributed along the circumference of the guide tube. The first anchoring ribs are pre-embedded in the cement seal. The end of the first flange near the cement seal is fixedly connected to the first anchoring rib.

[0016] It improves the connection strength between the guide tube and the cement seal, and also improves the connection strength between the first flange and the guide tube. It has good seismic resistance, is not easily damaged, and facilitates reliable fixing of the sleeve body.

[0017] Furthermore, a second anchoring rib is fixed in the middle of the guide tube. Multiple second anchoring ribs are provided and distributed along the circumference of the guide tube. The second anchoring ribs are pre-embedded in the cement seal.

[0018] Increase the connection strength between the middle of the guide tube and the cement plug to prevent the guide tube from detaching from the cement plug under vibration.

[0019] Furthermore, the sleeve body is provided with multiple sections, and the adjacent two ends of the sleeve body are connected by a third flange. One section of the sleeve body is located inside the guide tube and its two ends extend out of the guide tube.

[0020] When partial damage occurs to the casing body, the damaged casing can be removed and replaced by disassembling the flange, without having to completely remove the casing body, thus reducing maintenance costs. During replacement, after removing the damaged section of the casing body, the upper casing body is lowered and connected to the casing body below the removed location. Finally, a new pipe is added at the wellhead, making maintenance convenient.

[0021] Furthermore, the inner diameter of the guide tube is not less than the outer diameter of the third flange.

[0022] It facilitates the passage of the sleeve body with the third flange, making installation convenient.

[0023] Furthermore, a buffer sleeve is provided inside the guide tube, and the buffer sleeve is fixedly sleeved on the tube body.

[0024] It facilitates the absorption of vibration energy from the casing body, blocks the transmission of vibration from the casing body, and extends the service life of the casing body.

[0025] Furthermore, the buffer sleeve is provided in multiple parts and distributed along the vertical direction.

[0026] This facilitates the constraint of various parts of the casing body, gradually reducing vibration and improving the stability of the casing body.

[0027] Furthermore, the casing body is a PVC pipe; a casing vibration damping structure is also provided at the wellhead of the vertical shaft, and the casing vibration damping structure is fixedly connected to a section of the casing body located at the wellhead.

[0028] By using PVC pipes, the corrosion resistance is good, they are lightweight and easy to construct, and the installation and maintenance costs are low. By combining PVC pipes with sleeve vibration damping structures and buffer sleeves, the problem of PVC pipes easily transmitting vibrations is avoided, resulting in good stability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2 This is a schematic diagram showing the connection between the first flange and the second flange.

[0031] In the accompanying drawings, the technical features represented by each reference numeral are as follows: 1-Cement seal; 2-Guide pipe; 3-First flange; 4-Sleeve body; 5-Second flange; 6-Mounting stud; 7-Sealing soft cylinder; 8-First anchoring rib plate; 9-Second anchoring rib plate; 10-Third flange; 11-Buffer sleeve; 12-Sleeve vibration reduction structure. Detailed Implementation

[0032] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] This utility model refers to Figure 1-2 .

[0034] This utility model provides a casing installation structure for a water-sealed cavern shaft, including a cement plug 1 fixed to the side wall of the shaft, a guide pipe 2 vertically fixed inside the cement plug 1, a first flange 3 fixed to one end of the guide pipe 2, the first flange 3 being fixed to the end of the cement plug 1; a casing body 4 is also provided inside the guide pipe 2, with both the upper and lower ends of the casing body 4 extending out of the guide pipe 2, and a second flange 5 fixedly fitted on the casing body 4, the second flange 5 being detachably and sealingly connected to the first flange 3.

[0035] principle: During installation, the lower end of the casing body 4 can be used to connect to downhole equipment pipelines. This connection can be made before the cement plug 1 is poured, or it can be made after the cement plug 1 is poured, by entering the well through other temporary channels. The upper end of the casing body 4 can be used to connect to surface equipment pipelines. The first flange 3 and the guide pipe 2 can be pre-embedded and fixed within the cement plug 1, ensuring installation strength. Alternatively, the first flange 3 can be spaced from the cement plug 1 and fixed to the end of the cement plug 1 by stiffening plates, allowing space for bolt connection to the second flange 5. The second flange 5 is welded to the casing body 4 and also has a sealing connection with the first flange 3, ensuring the sealing between the cement plug 1 and the casing body 4. The first flange 3 and the second flange 5 can restrain the vibration and deflection of the casing body 4, ensuring the stability of the casing. When corrosion and damage occur in the casing, the casing body 4 can be replaced by disassembling the connection between the first flange 3 and the second flange 5.

[0036] In summary, by adopting this utility model, when the casing is corroded and damaged, the second flange 5 can be removed from the first flange 3 to replace the second flange 5 and the casing body 4, without the need to reconstruct other facilities in the shaft, thus saving maintenance costs. The first flange 3 and the second flange 5 can restrain the vibration and deflection of the casing body 4, ensuring the stability of the casing body 4 and the seal between the casing body 4 and the cement plug 1. In addition, the first flange 3 and the guide pipe 2 can be pre-embedded and cast into the cement plug 1, which has high installation strength, is not easily damaged, and facilitates reliable fixation of the casing body 4.

[0037] Furthermore, both ends of the guide tube 2 are fixed with a first flange 3; the upper and lower parts of the sleeve body 4 are fixedly fitted with a second flange 5.

[0038] Note: The first flange 3 and the second flange 5 at the lower end of the guide pipe 2 can be fixedly connected first, and then the cement seal 1 can be poured.

[0039] This facilitates the constraint of both the upper and lower parts of the casing body 4, thereby improving the stability of the casing body 4.

[0040] Furthermore, multiple mounting studs 6 are fixed on the first flange 3, the mounting studs 6 penetrate the second flange 5 and are connected to nuts; the first flange 3 extends at least partially into the cement seal 1.

[0041] Note: The first flange 3 is pre-embedded in the cement seal 1 during the pouring process, so that at least part of it extends into the cement seal 1.

[0042] The second flange 5 and the first flange 3 are connected by multiple mounting studs 6, which makes disassembly and assembly convenient and provides a strong connection.

[0043] Furthermore, it also includes a sealing cylinder 7, one end of which is sealed to the outer wall of the sleeve body 4, and the other end of which is sealed to the edge of the first flange 3; the second flange 5 is located inside the sealing cylinder 7.

[0044] Note: The sealing cylinder 7 can be made of thin-walled flexible metal material or sealing cloth, etc., and its two ends can be fixed to the first flange 3 or the sleeve body 4 by means of bonding, welding or other methods.

[0045] This design facilitates the enclosure of the mounting stud 6 within the sealing sleeve 7 for protection, preventing corrosion and extending the service life of the first flange 3 and the mounting stud 6.

[0046] Furthermore, a first anchoring rib plate 8 is fixed to the outside of the guide tube 2. Multiple first anchoring rib plates 8 are provided and distributed along the circumference of the guide tube 2. The first anchoring rib plates 8 are pre-embedded in the cement seal 1. The end of the first flange 3 near the cement seal 1 is fixedly connected to the first anchoring rib plate 8.

[0047] The connection strength between the guide tube 2 and the cement plug 1 is improved, as is the connection strength between the first flange 3 and the guide tube 2. It has good seismic resistance, is not easily damaged, and facilitates reliable fixing of the sleeve body 4.

[0048] Furthermore, a second anchoring rib plate 9 is fixed in the middle of the guide tube 2. Multiple second anchoring rib plates 9 are provided and distributed along the circumference of the guide tube 2. The second anchoring rib plates 9 are pre-embedded in the cement seal 1.

[0049] Increase the connection strength between the middle part of the guide tube 2 and the cement seal 1 to prevent the guide tube 2 from detaching from the cement seal 1 under vibration.

[0050] Furthermore, the sleeve body 4 is provided with multiple sections, and the adjacent two ends of the sleeve body 4 are connected by a third flange 10. One section of the sleeve body 4 is located inside the guide tube 2 and its two ends extend out of the guide tube 2.

[0051] When a section of the casing body 4 is partially damaged, the damaged casing can be removed and replaced by disassembling the flange, without having to completely remove the casing body 4, thus reducing maintenance costs. During replacement, after removing the damaged section of the casing body 4, the upper casing body 4 is lowered as a whole and connected to the casing body 4 below the removed position. Finally, a new pipe is added at the wellhead, making maintenance convenient.

[0052] Note: The section of casing body 4 located inside the guide tube 2 is protected by the guide tube 2 and is generally not damaged. In most cases, it is the sections of casing body 4 above the cement plug 1 that need to be replaced. If the casing body 4 inside or below the guide tube 2 is damaged, it can be accessed downhole through other temporary channels to connect the sections of casing body 4, or the casing body 4 below the guide tube 2 can be left unconnected and simply made to contact.

[0053] Furthermore, the inner diameter of the guide tube 2 is not less than the outer diameter of the third flange 10.

[0054] This facilitates the passage of the sleeve body 4 with the third flange 10, making installation convenient.

[0055] Furthermore, a buffer sleeve 11 is provided inside the guide tube 2, and the buffer sleeve 11 is fixedly sleeved on the sleeve body 4.

[0056] Note: The sleeve body 4 can be made of rubber sleeve, etc.

[0057] It facilitates the absorption of vibration energy from the casing body 4, blocks the transmission of vibration from the casing body 4, and extends the service life of the casing body 4.

[0058] Furthermore, the buffer sleeve 11 is provided in multiple forms and distributed along the vertical direction.

[0059] This facilitates the constraint of various parts of the casing body 4, gradually reducing vibration and improving the stability of the casing body 4.

[0060] Furthermore, the casing body 4 is a PVC pipe; a casing vibration damping structure 12 is also provided at the wellhead of the vertical shaft, and the casing vibration damping structure 12 is fixedly connected to a section of the casing body 4 located at the wellhead.

[0061] Note: The casing vibration reduction structure 12 can be a fixed frame fixed to the wellhead, with a vibration damping cylinder fixed in the middle of the fixed frame. The vibration damping cylinder is sleeved on the casing body 4. The vibration damping cylinder itself can be made of vibration-absorbing materials such as silicone, or a vibration damping layer can be set between the vibration damping cylinder and the casing body 4.

[0062] By using PVC pipes, the corrosion resistance is good, the construction is convenient and the installation and maintenance costs are low; by combining PVC pipes with the sleeve vibration damping structure 12 and the buffer sleeve 11, the problem of PVC pipes easily transmitting vibration is avoided, resulting in good stability.

[0063] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0064] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0066] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0067] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A casing installation structure for a water-sealed cavern shaft, characterized in that: The system includes a cement plug (1) fixed to the side wall of the shaft, a guide pipe (2) vertically fixed inside the cement plug (1), a first flange (3) fixed to one end of the guide pipe (2), and the first flange (3) fixed to the end of the cement plug (1); a sleeve body (4) is also provided inside the guide pipe (2), both the upper and lower ends of the sleeve body (4) extend out of the guide pipe (2), and a second flange (5) is also fixedly fitted on the sleeve body (4), and the second flange (5) is detachably sealed to the first flange (3).

2. The water-sealed cavern vertical shaft casing installation structure according to claim 1, characterized in that: Both ends of the guide tube (2) are fixed with a first flange (3); the upper and lower parts of the sleeve body (4) are fixedly fitted with a second flange (5).

3. The water-sealed cavern shaft casing installation structure according to claim 1 or 2, characterized in that: Multiple mounting studs (6) are fixed on the first flange (3), the mounting studs (6) penetrate the second flange (5) and are connected with nuts; the first flange (3) extends at least partially into the cement plug (1).

4. The water-sealed cavern shaft casing installation structure according to claim 3, characterized in that: It also includes a sealing cylinder (7), one end of which is sealed to the outer wall of the sleeve body (4), and the other end of which is sealed to the edge of the first flange (3); the second flange (5) is located inside the sealing cylinder (7).

5. The water-sealed cavern shaft casing installation structure according to claim 1 or 2, characterized in that: The outer side of the guide tube (2) is also fixed with a first anchoring rib plate (8). The first anchoring rib plate (8) is provided in multiple pieces and distributed along the circumference of the guide tube (2). The first anchoring rib plate (8) is pre-embedded in the cement plug (1). The end of the first flange (3) near the cement plug (1) is fixedly connected to the first anchoring rib plate (8).

6. The water-sealed cavern shaft casing installation structure according to claim 5, characterized in that: The middle part of the guide tube (2) is also fixed with a second anchoring plate (9). The second anchoring plate (9) is provided in multiple pieces and distributed along the circumference of the guide tube (2). The second anchoring plate (9) is pre-embedded in the cement seal (1).

7. The water-sealed cavern shaft casing installation structure according to claim 1, characterized in that: The sleeve body (4) is provided with multiple sections, and the adjacent two ends of the sleeve body (4) are connected by a third flange (10). One section of the sleeve body (4) is located inside the guide tube (2) and its two ends extend out of the guide tube (2).

8. The water-sealed cavern shaft casing installation structure according to claim 7, characterized in that: The inner diameter of the guide tube (2) is not less than the outer diameter of the third flange (10).

9. The water-sealed cavern shaft casing installation structure according to claim 8, characterized in that: The guide tube (2) is also provided with a buffer sleeve (11), which is fixedly sleeved on the sleeve body (4).

10. The water-sealed cavern shaft casing installation structure according to claim 9, characterized in that: The buffer sleeve (11) is provided in multiple parts and distributed along the vertical direction.

11. The casing installation structure for a water-sealed cavern shaft according to claim 9, characterized in that: The casing body (4) is a PVC pipe; a casing vibration damping structure (12) is also provided at the wellhead of the vertical shaft, and the casing vibration damping structure (12) is fixedly connected to a section of the casing body (4) located at the wellhead.

Images