Construction device and method of horizontal cavity salt cavern gas storage

Abstract

The invention belongs to the technical field of underground energy reserve, and particularly relates to a construction device and method of a horizontal cavity salt cavern gas storage. The construction device comprises a water injection shell, a water injection groove is formed in the center of the water injection shell, the top face of the water injection shell is fixedly connected with a connecting pipe communicating with the water injection groove, and the connecting pipe is used for being externally connected with a water injection pipe; a group of storage cavities are formed in the water injection shell, and a group of liquid injection pipes communicating with the storage cavities are fixedly connected to the top surface of the water injection shell; the magnetic ring rotates to drive a second gear to rotate, so that the second gear drives a first gear to rotate, the first gear drives a first rotating shaft to rotate, at the moment, first driving blades rotate, auxiliary fluid is stirred, fluid flocculation is prevented, the use effect of the auxiliary fluid is improved, and the cavity construction progress is accelerated; and after stirring is completed, the electromagnetic valve on the liquid outlet pipe can be opened, so that the fluid is discharged into a salt layer for cavity construction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground energy reserves, and particularly relates to a horizontal cavity salt cavern gas storage construction device and method. BACKGROUND

[0002] The horizontal cavity salt cavern gas storage is an artificial gas storage space formed by using the dissolution of the underground salt layer to form a cavity, and has the advantages of good sealing, high injection-production efficiency and strong peak regulation capacity. The technology originates from the salt cavern gas practice in Europe and the United States in the 1940s. Through the combination of horizontal directional drilling and hydraulic dissolution, a large-capacity, low-permeability gas storage cavity can be constructed. The technology uses natural gas strategic reserves and new energy storage, and compared with the traditional vertical salt cavern, the horizontal cavity effectively improves the space utilization rate and has become an important development direction of global underground gas storage construction. During the cavity forming process of the horizontal cavity salt cavern gas storage, fresh water is usually injected into the salt layer through a vertical well to dissolve the salt rock, and auxiliary fluids such as annulus protection fluid and dissolution inhibitor are also used. However, if these fluids are unstable in composition or are affected by external factors and flocculate, their flowability and dissolution efficiency will be significantly reduced, causing pumping difficulties and affecting operation efficiency. It will also lead to dissolution efficiency and control failure. If the dissolution inhibitor flocculates and stratifies, it cannot form a clear and stable interface to control the dissolution range, resulting in an irregular contact interface between fresh water and salt rock, and thus causing irregular cavity morphology. The cavity with irregular morphology may have stress concentration points, affecting the structural stability. It may also fail to achieve the designed volume, affecting the gas storage capacity. Even it may damage the sealing layer due to uneven dissolution, affecting the sealing performance. All these will increase the difficulty, time and cost of construction. SUMMARY

[0003] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background.

[0004] The technical scheme adopted by the application to solve its technical problems is: the horizontal cavity salt cavern gas storage construction device comprises a water injection shell, a water injection groove is formed in the center of the water injection shell, a connecting pipe is fixedly connected to the top surface of the water injection shell and communicates with the water injection groove, and the connecting pipe is used to connect an external water injection pipe; a group of storage cavities are formed in the water injection shell, a group of liquid injection pipes are fixedly connected to the top surface of the water injection shell and communicate with the storage cavities, a group of liquid outlet pipes are fixedly connected to the bottom surface of the water injection shell and communicate with the storage cavities, and an electromagnetic valve is arranged in the liquid outlet pipe; a first rotating shaft is rotatably connected to the inner wall top surface of the storage cavity, a group of first driving blades are fixedly connected to the surface of the first rotating shaft, a first gear is fixedly connected to the surface of the first rotating shaft, a group of connecting grooves are formed in the water injection shell and communicate with the storage cavities, a second gear is rotatably connected to the inner wall of the connecting groove and meshes with the first gear, and a driving assembly is arranged on the water injection shell to drive the second gear to rotate.

[0005] Preferably, the driving assembly comprises a magnetic ring rotationally connected with the inner wall of the water injection tank, the bottom surface of the magnetic ring is fixedly connected with a second rotating shaft, the surface of the second rotating shaft is fixedly connected with a group of second driving blades, and the magnetic ring is arranged in magnetic attraction with the second gear.

[0006] Preferably, the inner wall of the storage cavity is fixedly connected with an elastic sheet, a gap is formed between the side of the elastic sheet close to the water injection tank and the inner wall of the storage cavity, the liquid outlet pipe is arranged at the gap, and a shaking assembly is arranged on the elastic sheet to shake the elastic sheet.

[0007] Preferably, the shaking assembly comprises a group of first magnetic blocks fixed on the top surface of the elastic sheet, the bottom surface of the first driving blade is fixedly connected with a second magnetic block, the second magnetic block is arranged in magnetic attraction with the first magnetic block, and the positions of the second magnetic block and the first magnetic block correspond to each other.

[0008] Preferably, the side of the elastic sheet close to the water injection tank is chamfered, the top surface of the inner wall close to the chamfered portion of the elastic sheet is fixedly connected with a first spring, and the other end of the first spring is fixedly connected with the inner wall of the storage cavity.

[0009] Preferably, the outer side wall of the water injection shell is fixedly connected with a pair of connecting plates, the side of the connecting plate away from the water injection shell is open, the inner wall of the connecting plate is sealingly and slidably connected with an adjusting plate, the bottom surface of the adjusting plate is fixedly connected with an arc-shaped supporting plate, and the connecting plate is provided with a moving assembly for driving the adjusting plate to move.

[0010] Preferably, the moving assembly comprises a first circular ring fixed on the connecting plate, the top end of the first circular ring is open, the inner wall of the first circular ring is sealingly and slidably connected with a second circular ring, a hydraulic rod is fixedly connected between the bottom surface of the second circular ring and the inner wall of the first circular ring, a pair of second connecting holes are formed in the bottom surface of the first circular ring, a first connecting hole in communication with the second connecting holes is formed in the top surface of the connecting plate, a second spring is fixedly connected to the side of the adjusting plate close to the first connecting hole, and the end of the second spring away from the adjusting plate is fixedly connected with the inner wall of the connecting plate.

[0011] A construction method of the horizontal cavity salt cavern gas storage, which adopts the construction device of the horizontal cavity salt cavern gas storage to assist in cavity construction of the salt layer.

[0012] The beneficial effects of the present application are as follows: 1. The magnetic ring is used to drive the second gear to rotate, so that the second gear drives the first gear to rotate, the first rotating shaft is driven to rotate by the first gear, the first driving blade is driven to rotate, the auxiliary fluid is stirred to prevent flocculation of the fluid, the use effect of the auxiliary fluid is improved, the cavity construction progress is accelerated, and after the stirring is completed, the electromagnetic valve on the liquid outlet pipe is opened, so that the fluid is discharged into the salt layer for cavity construction.

[0013] 2. The second magnetic block will pass the first magnetic block when the first driving blade rotates, at this time the first magnetic block will be attracted, after the second magnetic block leaves the first magnetic block, the elastic sheet will restore due to its own elasticity, at this time the elastic sheet will vibrate, under the condition that the first driving blade continues to rotate, the elastic sheet will also continue to vibrate, thereby improving the flocculation of the auxiliary fluid. BRIEF DESCRIPTION OF DRAWINGS

[0014] The application will be further described below in combination with the drawings.

[0015] Figure 1 is a schematic view of the three-dimensional structure of the water injection shell of the application; Figure 2 is a sectional view of the water injection shell of the application; Figure 3 is another perspective sectional view of the water injection shell of the application; Figure 4 is a front view of the water injection shell of the application; Figure 5 is an enlarged view of A of Figure 4

[0016] In the figure: 1, water injection shell; 2, connecting pipe; 3, liquid injection pipe; 4, water injection tank; 5, first rotating shaft; 6, first driving blade; 7, first gear; 8, second gear; 9, storage cavity; 10, magnetic ring; 11, second rotating shaft; 12, second driving blade; 13, elastic sheet; 14, first magnetic block; 15, second magnetic block; 16, chamfer; 17, first spring; 18, liquid outlet pipe; 19, connecting plate; 20, adjusting plate; 21, supporting plate; 22, first circular ring; 23, second circular ring; 24, hydraulic rod; 25, first connecting hole; 26, second connecting hole; 27, second spring; 28, connecting groove. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application will be further described below in combination with specific embodiments.

[0018] Example one: as Figures 1 to 3 ​As shown, an embodiment of the present invention provides a construction device for a horizontal cavity salt cavern gas storage facility, comprising a water injection shell 1, a water injection groove 4 formed at the center of the water injection shell 1, a connecting pipe 2 connected to the water injection groove 4 fixedly connected to the top surface of the water injection shell 1, the connecting pipe 2 being used for external water injection pipe connection; a set of storage cavities 9 formed inside the water injection shell 1, a set of liquid injection pipes 3 connected to the top surface of the water injection shell 1 and communicating with the storage cavities 9 fixedly connected, a set of liquid outlet pipes 18 connected to the bottom surface of the water injection shell 1 and communicating with the storage cavities 9 fixedly connected, an electromagnetic valve being installed inside the liquid outlet pipes 18; a first rotating shaft 5 rotatably connected to the top surface of the inner wall of the storage cavity 9, a set of first driving blades 6 fixedly connected to the surface of the first rotating shaft 5, a first gear 7 fixedly connected to the surface of the first rotating shaft 5, a set of connecting grooves 28 connected to the storage cavities 9 formed inside the water injection shell 1, a second gear 8 meshing with the first gear 7 rotatably connected to the inner wall of the connecting grooves 28, and a driving assembly for driving the second gear 8 to rotate being provided on the water injection shell 1; This application allows different auxiliary fluids to be injected into different storage cavities 9 via injection pipe 3. By placing water injection shell 1 above the wellhead and connecting water injection pipe to the outside of connecting pipe 2, the water injected by the injection pipe will flow into the well along the injection trough 4 to reach the salt layer, thus constructing a horizontal cavity salt cavern gas storage tank. When it is necessary to discharge auxiliary fluid into the salt layer, the second gear 8 can be driven to rotate by the drive component, thereby driving the first gear 7 to rotate, which in turn drives the first rotating shaft 5 to rotate. At this time, the first drive blade 6 will rotate, thereby stirring the auxiliary fluid to prevent fluid flocculation, improve the use effect of the auxiliary fluid, and thus speed up the cavity construction process. After stirring is completed, the solenoid valve on the liquid outlet pipe 18 can be opened to allow the fluid to be discharged into the salt layer for cavity construction.

[0019] The drive assembly includes a magnetic ring 10 rotatably connected to the inner wall of the water injection tank 4. A second rotating shaft 11 is fixedly connected to the bottom surface of the magnetic ring 10, and a set of second drive blades 12 are fixedly connected to the surface of the second rotating shaft 11. The magnetic ring 10 and the second gear 8 are magnetically attracted to each other. During the injection process, the fresh water in this application passes through the water injection tank 4. At this time, the water flow will drive the second drive blades 12 to rotate the second rotating shaft 11. This rotation will drive the magnetic ring 10 to rotate, thereby causing the magnetic ring 10 to drive the second gear 8 to rotate. In turn, the second gear 8 drives the secondary gear to rotate, so that the first drive blades 6 can stir the auxiliary fluid in the storage cavity 9. Through the above mechanism, multiple sets of first drive blades 6 can be driven to rotate synchronously by the power of the water flow, without the need to add other power mechanisms.

[0020] The inner wall of the storage cavity 9 is fixedly connected with an elastic sheet 13, and a gap is formed between the side of the elastic sheet 13 close to the water injection groove 4 and the inner wall of the storage cavity 9, and the liquid outlet pipe 18 is arranged at the gap, and a shaking assembly is arranged on the elastic sheet 13 to shake the elastic sheet 13; when the auxiliary fluid is stirred, the elastic sheet 13 can be shaken by the shaking assembly, and the flocculation generally sinks to the bottom, so that the flocculation is above the elastic sheet 13, and when the elastic sheet 13 is shaken, the flocculation can be dispersed, and the stirring effect of the first driving blade 6 on the auxiliary fluid is better.

[0021] The shaking assembly includes a group of first magnetic blocks 14 fixed to the top surface of the elastic sheet 13, and the bottom surface of the first driving blade 6 is fixedly connected with a second magnetic block 15, the second magnetic block 15 is magnetically attracted to the first magnetic block 14, and the positions of the second magnetic block 15 and the first magnetic block 14 correspond to each other; when the first driving blade 6 rotates, the second magnetic block 15 passes through the first magnetic block 14, and the first magnetic block 14 is attracted at this time, and after the second magnetic block 15 leaves the first magnetic block 14, the elastic sheet 13 restores due to its own elasticity, and the elastic sheet 13 shakes at this time, and the elastic sheet 13 also continuously shakes under the condition that the first driving blade 6 continuously rotates, so that the flocculation of the auxiliary fluid is improved.

[0022] The side of the elastic sheet 13 close to the water injection groove 4 is provided with a chamfer 16, the inner wall top surface close to the chamfer 16 of the elastic sheet 13 is fixedly connected with a first spring 17, and the other end of the first spring 17 is fixedly connected with the inner wall of the storage cavity 9; the elastic sheet 13 in the application can be inclined to the side close to the water injection groove 4 by the tension of the first spring 17, and when the auxiliary fluid is discharged, the electromagnetic valve on the liquid outlet pipe 18 is opened, and the fluid can slide on the inclined elastic sheet 13 at this time, so that the auxiliary fluid can be completely discharged, and the waste of the auxiliary fluid is avoided.

[0023] Embodiment two: as shown in Figures 4 to 5 Another embodiment of the application is shown in the comparative embodiment one, wherein a pair of connecting plates 19 are fixedly connected to the outer side wall of the water injection shell 1, the side away from the water injection shell 1 of the connecting plate 19 is provided with an opening, the inner wall of the connecting plate 19 is sealingly and slidably connected with an adjusting plate 20, the bottom surface of the adjusting plate 20 is fixedly connected with an arc-shaped supporting plate 21, and the connecting plate 19 is provided with a moving assembly to drive the adjusting plate 20 to move; when the water injection shell 1 is placed above the well mouth, the moving assembly can be used to control the adjusting plate 20 to move outward, so that the length of the adjusting plate 20 is greater than the diameter of the well mouth, and then the water injection shell 1 is placed on the well mouth, and the supporting plate 21 is attached to the inner wall of the well mouth, so that the stability of the device is further improved.

[0024] The moving assembly comprises a first circular ring 22 fixed on the connecting plate 19, the top end of the first circular ring 22 is provided with an opening, the inner wall of the first circular ring 22 is sealingly connected with a second circular ring 23, the bottom surface of the second circular ring 23 is fixedly connected with a hydraulic rod 24 between the inner wall of the first circular ring 22, a pair of second connecting holes 26 are formed in the bottom surface of the first circular ring 22, a first connecting hole 25 is formed in the top surface of the connecting plate 19 and communicates with the second connecting holes 26, a second spring 27 is fixedly connected to one side of the adjusting plate 20 close to the first connecting hole 25, and one end of the second spring 27 away from the adjusting plate 20 is fixedly connected to the inner wall of the connecting plate 19; by means of the hydraulic rod 24, the second circular ring 23 is driven to move downward, so that the second circular ring 23 pushes the gas in the first circular ring 22 to pass through the first connecting hole 25 and the second connecting hole 26 and finally enters the connecting plate 19 to push the adjusting plate 20, so that the position of the adjusting plate 20 can be moved.

[0025] A construction method of a horizontal cavity salt cavern gas storage, which uses the construction device of a horizontal cavity salt cavern gas storage.

[0026] Working principle: different auxiliary fluids are injected into different storage cavities 9 through the liquid injection pipe 3, the water injection shell 1 is placed above the well mouth, and then the water injection pipe is connected to the connecting pipe 2, at this time, the water injected by the water injection pipe will be discharged into the well along the water injection groove 4 to reach the salt layer, and the horizontal cavity salt cavern gas storage is constructed, when it is necessary to discharge the auxiliary fluid into the salt layer, the second gear 8 can be driven to rotate by means of the driving assembly, so that the second gear 8 drives the first gear 7 to rotate, and the first gear 7 drives the first shaft 5 to rotate, at this time, the first driving blade 6 rotates, so as to stir the auxiliary fluid to prevent the fluid from flocculating and improve the use effect of the auxiliary fluid, thereby speeding up the cavity construction progress, after the stirring is completed, the electromagnetic valve on the liquid outlet pipe 18 can be opened, so that the fluid is discharged into the salt layer for cavity construction; the fresh water in the application will pass through the water injection groove 4 during injection, at this time, the water flow drives the second driving blade 12 to drive the second shaft 11 to rotate, at this time, the second rotation drives the magnetic ring 10 to rotate, so that the magnetic ring 10 drives the second gear 8 to rotate, and then the second gear 8 drives the secondary gear to rotate, so that the first driving blade 6 can stir the auxiliary fluid in the storage cavity 9, by means of the above-mentioned mechanism, the power of the water flow can be used to drive a plurality of first driving blades 6 to rotate synchronously, without the need to additionally add other power mechanisms; When the auxiliary fluid is stirred in the application, the elastic sheet 13 can be shaken by the shaking assembly, and the flocculation generally sinks to the bottom, thereby sinking above the elastic sheet 13. When the elastic sheet 13 is shaken, the flocculation can be dispersed, and the stirring effect of the first driving blade 6 on the auxiliary fluid is better. When the first driving blade 6 rotates, the second magnetic block 15 passes through the first magnetic block 14, and the first magnetic block 14 is attracted. After the second magnetic block 15 leaves the first magnetic block 14, the elastic sheet 13 restores due to its own elasticity, and the elastic sheet 13 shakes. Under the condition that the first driving blade 6 continuously rotates, the elastic sheet 13 also continuously shakes, thereby improving the flocculation of the auxiliary fluid. The elastic sheet 13 in the application can be inclined to the side close to the water injection groove 4 by the tension of the first spring 17. When the auxiliary fluid is discharged, the electromagnetic valve on the liquid outlet pipe 18 is opened, and the fluid can slide on the inclined elastic sheet 13 and be discharged, so that the auxiliary liquid can be completely discharged, avoiding waste of the auxiliary fluid.

[0027] The above-mentioned front, back, left, right, up, and down are based on the observation angle of the person in the drawings Figure 1 of the specification, and the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and the like.

[0028] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element 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 scope of protection of the application.

[0029] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A horizontal cavity salt cave gas storage construction device, comprising a water injection shell (1), a water injection groove (4) is formed in the central part of the water injection shell (1), a connecting pipe (2) is fixedly connected to the top surface of the water injection shell (1) and communicates with the water injection groove (4), and the connecting pipe (2) is used for external connection of a water injection pipe; characterized in that a group of storage cavities (9) are formed in the water injection shell (1), a group of liquid injection pipes (3) are fixedly connected to the top surface of the water injection shell (1) and communicate with the storage cavities (9), a group of liquid outlet pipes (18) are fixedly connected to the bottom surface of the water injection shell (1) and communicate with the storage cavities (9), and an electromagnetic valve is arranged in the liquid outlet pipe (18); a first rotating shaft (5) is rotatably connected to the inner wall top surface of the storage cavity (9), a group of first driving leaves (6) are fixedly connected to the surface of the first rotating shaft (5), a first gear (7) is fixedly connected to the surface of the first rotating shaft (5), a group of connecting grooves (28) are formed in the water injection shell (1) and communicate with the storage cavities (9), a second gear (8) is rotatably connected to the inner wall of the connecting groove (28) and meshes with the first gear (7), and a driving assembly for driving the second gear (8) to rotate is arranged on the water injection shell (1).

2. The construction device of a horizontal cavity salt chamber gas storage according to claim 1, characterized in that: The driving assembly comprises a magnetic ring (10) rotatably connected to the inner wall of the water injection groove (4), a second rotating shaft (11) is fixedly connected to the bottom surface of the magnetic ring (10), a group of second driving leaves (12) are fixedly connected to the surface of the second rotating shaft (11), and the magnetic ring (10) is magnetically attracted to the second gear (8).

3. A horizontal cavern salt gas storage construction apparatus according to claim 2, characterized in that: An elastic sheet (13) is fixedly connected to the inner wall of the storage cavity (9), a gap is formed between one side of the elastic sheet (13) close to the water injection groove (4) and the inner wall of the storage cavity (9), the liquid outlet pipe (18) is arranged at the gap, and a shaking assembly for shaking the elastic sheet (13) is arranged on the elastic sheet (13).

4. The apparatus according to claim 3, wherein: The shaking assembly comprises a group of first magnetic blocks (14) fixed to the top surface of the elastic sheet (13), second magnetic blocks (15) are fixedly connected to the bottom surface of the first driving leaves (6), the second magnetic blocks (15) are magnetically attracted to the first magnetic blocks (14), and the positions of the second magnetic blocks (15) correspond to those of the first magnetic blocks (14).

5. The apparatus of claim 4, wherein: One side of the elastic sheet (13) close to the water injection groove (4) is provided with a chamfer (16), a first spring (17) is fixedly connected to the inner wall top surface of the elastic sheet (13) close to the chamfer (16), and the other end of the first spring (17) is fixedly connected to the inner wall of the storage cavity (9).

6. A horizontal cavern salt gas storage construction apparatus according to claim 5, characterized in that: A pair of connecting plates (19) are fixedly connected to the outer side wall of the water injection shell (1), the connecting plates (19) are provided with openings on the sides away from the water injection shell (1), an adjusting plate (20) is sealingly and slidably connected to the inner wall of the connecting plate (19), an arc-shaped supporting plate (21) is fixedly connected to the bottom surface of the adjusting plate (20), and a moving assembly for driving the adjusting plate (20) to move is arranged on the connecting plate (19).

7. A horizontal cavity salt cavern reservoir construction apparatus according to claim 6, wherein: The mobile assembly comprises a first circular ring (22) fixed on a connecting plate (19), the top of the first circular ring (22) is provided with an opening, the inner wall of the first circular ring (22) is sealingly connected with a second circular ring (23), the bottom surface of the second circular ring (23) is fixedly connected with a hydraulic rod (24) between the inner wall of the first circular ring (22), a pair of second connecting holes (26) are formed in the bottom surface of the first circular ring (22), a first connecting hole (25) is formed in the top surface of the connecting plate (19) and communicates with the second connecting holes (26), a second spring (27) is fixedly connected to the side of the adjusting plate (20) close to the first connecting hole (25), and the end of the second spring (27) away from the adjusting plate (20) is fixedly connected to the inner wall of the connecting plate (19).

8. A method of constructing a horizontal cavity salt dome gas storage, characterized by: The horizontal cavity salt cavern gas storage construction device of any one of claims 1-7 is used to assist in cavity formation of a salt layer.

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