Deep geothermal well multi-aquifer packing device, water taking device and water taking method

Abstract

The invention discloses a deep geothermal well multi-aquifer packing device which comprises a separating pipe, the separating pipe is sleeved with a plurality of separating air bags, the separating air bags are annular, the separating air bags are fixedly connected with the separating pipe, the separating air bags are arranged at equal intervals in the axial direction of the separating pipe, and the left side and the right side of the separating pipe are each provided with an inflation thin pipe. A plurality of partition air bags are arranged on the upper moving aquifer packing assembly, the partition air bags are arranged on the upper moving aquifer packing assembly, the air inflation thin pipes sequentially penetrate through the partition air bags, the air inflation thin pipes are fixedly connected with the partition air bags, and vent holes are formed in the portions, located in the partition air bags, of the air inflation thin pipes. Other aquifers except the bottommost aquifer can be completely sealed, only water in the bottommost aquifer enters the separation pipe, high-temperature geothermal water at the bottommost layer can be obtained by pumping out the water in the separation pipe, and the geothermal water storage tank is simple in structure, low in manufacturing cost and beneficial to application and popularization.

Description

Technical Field

[0001] The present invention relates to the field of geothermal wells, and in particular to a multi-aquifer isolation device, a water extraction device and a water extraction method for a deep geothermal well. Background Art

[0002] Geothermal water refers to groundwater with a temperature higher than the surrounding rock at the observation depth. The temperature at which water begins to boil under a certain pressure is called the saturation temperature. The deeper the geothermal water is buried, the higher the static pressure it is subjected to, and the higher the corresponding saturation temperature. In the drilling construction of geothermal water development, since the thermal reservoir is usually buried deep, when there are multiple aquifers, a sealing device is required to seal the upper aquifer to isolate the upper aquifer and directly use the deep geothermal water.

[0003] For example, the patent with application number 202310664411.X discloses a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method, which belong to the field of mine isolation and water extraction technology; the isolation device includes a central tube, which passes through the axes of a driving device, a rubber cylinder and an unlocking device from top to bottom in sequence; the rubber cylinder is made of an elastic material and deforms radially along the central tube under the pressure of the driving device; the water extraction device includes a casing, and perforations are provided on the circumferential side of the casing, and the perforations are filled with temporary blocking blocks, which are made of a water-soluble material; the central tube is arranged in the casing, and the casing is isolated or unsealed by the radial deformation of the rubber cylinder along the central tube; the device facilitates direct water extraction from the underlying geothermal water layer and improves the efficiency of geothermal water extraction, the isolation device does not require pipeline pressurization, has a simple structure, and is of low cost, which can greatly reduce the blocking cost of geothermal wells.

[0004] The patent with application number 202320997369.9 discloses a sealing device for geothermal well branch wells, including: a geothermal well assembly; a sealing assembly, including a support plate 1, a telescopic rod 2 connected to the support plate 1, a motor 1 for controlling the telescopic rod 2, a conical clamping plate connected to the front end of the telescopic rod 2, a sealing ring and a support column connected to the front end of the conical clamping plate, a telescopic rod 1 connected to the support column, and an arc block connected to the telescopic rod 1; a rotating assembly. There will be multiple branch wells opened in the geothermal well, and heat energy will be recycled through the branch wells. The heat energy of each branch well is different, but the connected branch wells are not convenient for using the heat energy of each branch well separately. By installing a sealing assembly on the side wall of the pumping pipe, the telescopic rod 2 controls the conical clamping plate and the sealing ring to be tightly pressed on the branch well wall. The telescopic rod 1 can press the arc block tightly on the branch well wall according to the diameter of the branch well wall to prevent the conical clamping plate and the sealing ring from loosening and causing gaps due to the flow of water.

[0005] However, the above-mentioned patent and similar patents have complex structures, high costs, and are unable to seal only the upper aquifer and discharge water only from the bottom, so improvements are needed. Summary of the invention

[0006] The object of the present invention is to provide a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method to solve the above-mentioned technical problems.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A multi-aquifer isolation device for a deep geothermal well comprises a separator tube, on which a plurality of separator airbags are sleeved, the separator airbags are annular, the separator airbags are fixedly connected to the separator tube, and the separator airbags are equidistantly arranged along the axial direction of the separator tube, and inflatable capillaries are arranged on both sides of the left and right sides of the separator tube, the inflatable capillaries pass through a plurality of separator airbags in sequence, the inflatable capillaries are fixedly connected to the separator airbags, and a vent is provided on the portion of the inflatable capillaries located in the separator airbags, a first buffer spring is provided between two adjacent separator airbags, one end of the first buffer spring is fixedly connected to the inflatable capillaries, and the other end of the first buffer spring is fixedly connected to an elastic ball, a circular water inlet hole is provided on the side of the separator tube close to the elastic ball, and a circular water inlet hole blocking mechanism is provided inside the separator tube.

[0009] Preferably, a bottom cover is provided at the bottom of the separation tube, and the bottom cover is fixedly connected to the bottom end of the separation tube.

[0010] Preferably, the bottom end of the inflatable tube is closed, and the top of the inflatable tube is threadedly connected with a sealing cap.

[0011] Preferably, the circular water inlet hole blocking mechanism comprises a guide tube, the guide tube is in the shape of a quadrangular prism, the bottom end of the guide tube is fixedly connected to the bottom cover, and an aquifer isolation assembly is slidably connected to the guide tube.

[0012] Preferably, the aquifer isolation assembly includes a slider, which is cylindrical and has a quadrangular prism-shaped slide groove running through the center of the slider, the slide groove is plugged into and fits with the guide tube, a multi-layer sealing tube is sleeved on the outer side of the slider, a connecting bracket is provided between the slider and the innermost sealing tube, one end of the connecting bracket is fixedly connected to the slider, and the other end of the connecting bracket is fixedly connected to the innermost sealing tube, and the top of the slider is fixedly connected to the lower end of the connecting rope.

[0013] Preferably, the aquifer isolation assembly also includes a bayonet, and bayonet are provided on both sides of the left and right sides of the sealing tube, and receiving grooves are provided on the surface of the sealing tube on both sides above and below the bayonet, and a locking structure is provided in the receiving groove, and the locking structure at the lower part of the inner sealing tube is located in the bayonet on the outer sealing tube.

[0014] Preferably, the card structure includes a card plate, which is located in the accommodating slot, and the lower end of the card plate is connected to the bottom of the accommodating slot by a hinge, an upper card block is provided on the top of the card plate, and the upper card block is fixedly connected to the card plate, a middle card block is provided in the middle of the card plate, and the middle card block is fixedly connected to the card plate, and a second buffer spring is provided in the accommodating slot, one end of the second buffer spring is fixedly connected to the card plate, and the other end of the second buffer spring is fixedly connected to the accommodating slot.

[0015] Preferably, the clamping structure further includes a fixing screw, the fixing screw is threadedly connected to the clamping plate, a threaded hole is provided in the accommodating groove, and the fixing screw is threadedly matched with the threaded hole.

[0016] Preferably, a plurality of water inlet pipes are fixedly provided at the bottom of the guide pipe, the water inlet pipes are communicated with the guide pipe, and the top end of the guide pipe is connected to a water pump.

[0017] The beneficial effects of the present invention are:

[0018] The present invention designs a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method. By moving the aquifer isolation component upward, all aquifers except the bottom aquifer can be sealed, and only the water in the bottom aquifer enters the separation pipe. By pumping out the water in the separation pipe, the high-temperature geothermal water in the bottom layer can be obtained. The present invention has a simple structure and a low cost, which is conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a multi-aquifer isolation device, a water extraction device and a water extraction method for a deep geothermal well according to the present invention;

[0020] Figure 2 The present invention provides a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method Figure 1 An enlarged schematic diagram of part B;

[0021] Figure 3 The present invention provides a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method Figure 1 An enlarged schematic diagram of the C portion;

[0022] Figure 4 It is a structural schematic diagram of an aquifer isolation assembly of a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method according to the present invention;

[0023] Figure 5 The present invention provides a deep geothermal well multi-aquifer isolation device, a water extraction device and a water extraction method Figure 4 A magnified schematic diagram of part A;

[0024] Figure numerals: 1. connecting rope; 2. slide groove; 3. slider; 4. connecting bracket; 5. blocking tube; 6. bayonet; 7. upper clamping block; 8. clamping plate; 9. middle clamping block; 10. hinge; 11. fixing screw; 12. receiving groove; 13. second buffer spring; 14. inflatable capillary; 15. guide tube; 16. partition tube; 17. partition airbag; 18. first buffer spring; 19. circular water inlet hole; 20. elastic ball; 21. bottom cover; 23. water inlet pipe. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] like Figure 1-5As shown, a multi-aquifer isolation device for a deep geothermal well includes a separator tube 16, on which a plurality of separator airbags 17 are sleeved. The separator airbags 17 are annular and fixedly connected to the separator tube 16. The separator airbags 17 are equidistantly arranged along the axial direction of the separator tube 16. Inflatable capillaries 14 are arranged on both sides of the left and right sides of the separator tube 16. The inflatable capillaries 14 pass through a plurality of separator airbags 17 in sequence. The inflatable capillaries 14 are fixedly connected to the separator airbags 17. A vent is provided on the portion of the inflatable capillaries 14 located in the separator airbags 17. A first buffer spring 18 is provided between two adjacent separator airbags 17. One end of the first buffer spring 18 is fixedly connected to the inflatable capillaries 14, and the other end of the first buffer spring 18 is fixedly connected to an elastic ball 20. A circular water inlet hole 19 is provided on the side of the separator tube 16 close to the elastic ball 20, and a circular water inlet hole blocking mechanism is provided inside the separator tube 16. A bottom cover 21 is provided at the bottom of the separation tube 16, and the bottom cover 21 is fixedly connected to the bottom end of the separation tube 16. The bottom end of the inflatable cap 14 is closed, and a sealing cap is threadedly connected to the top of the inflatable cap 14. The separation tube 16, the inflatable cap 14, and the guide tube 15 are all soft tubes.

[0030] First, drill a hole in the ground where the geothermal water is located, then release the separation tube 16 stored on the line drum and insert it into the borehole. Release the separation tube 16 of the corresponding length according to the number of meters underground that needs to be lowered, unscrew the sealing cap on the top of the inflatable capillary 14, and then inflate each separation airbag 17 through the inflatable capillary 14, so that the separation airbag 17 expands and presses against the inner wall of the borehole. On the one hand, the separation tube 16 can be fixed in the borehole, and on the other hand, the separation airbag 17 can be used to divide the inside of the borehole into several spaces to separate the geothermal water of each water layer.

[0031] Example 2

[0032] like Figure 1-5As shown, when other parts are the same as those of Example 1, the difference between this embodiment and Example 1 is that the circular water inlet hole plugging mechanism includes a guide tube 15, which is in the shape of a quadrangular prism, and the bottom end of the guide tube 15 is fixedly connected to the bottom cover 21, and an aquifer isolation assembly is slidably connected to the guide tube 15. The aquifer isolation assembly includes a slider 3, which is in the shape of a cylinder, and a quadrangular prism-shaped slide groove 2 is opened through the center of the slider 3, and the slide groove 2 is plugged and matched with the guide tube 15, and a multi-layer plugging tube 5 is sleeved on the outer side of the slider 3, and a connecting bracket 4 is provided between the slider 3 and the innermost plugging tube 5, and one end of the connecting bracket 4 is fixedly connected to the slider 3, and the other end of the connecting bracket 4 is fixedly connected to the innermost plugging tube 5, and the top of the slider 3 is fixedly connected to the lower end of the connecting rope 1. The aquifer isolation assembly also includes a bayonet 6, which is provided on both the left and right sides of the plugging tube 5, and a receiving groove 12 is provided on the surface of the plugging tube 5 on both the upper and lower sides of the bayonet 6, and a positioning structure is provided in the receiving groove 12, and the positioning structure at the lower part of the inner plugging tube 5 is located in the bayonet 6 on the outer plugging tube 5. The positioning structure includes a clamping plate 8, which is located in the receiving groove 12, and the lower end of the clamping plate 8 is connected to the bottom of the receiving groove 12 through a hinge 10, and an upper clamping block 7 is provided on the top of the clamping plate 8, and the upper clamping block 7 is fixedly connected to the clamping plate 8, and a middle clamping block 9 is provided in the middle of the clamping plate 8, and the middle clamping block 9 is fixedly connected to the clamping plate 8, and a second buffer spring 13 is provided in the receiving groove 12, and one end of the second buffer spring 13 is fixedly connected to the clamping plate 8, and the other end of the second buffer spring 13 is fixedly connected to the receiving groove 12. The positioning structure also includes a fixing screw 11, which is threadedly connected to the clamping plate 8, and a threaded hole is provided in the receiving groove 12, and the fixing screw 11 is threadedly matched with the threaded hole.

[0033] Before use, press the card plate 8 at the top of the outermost plugging tube 5 into the receiving groove 12, and then turn the fixing screw 11 to connect the fixing screw 11 with the threaded hole in the receiving groove 12, so that the card plate 8 at the top of the outermost plugging tube 5 is hidden in the receiving groove 12. The aquifer isolation assembly is located at the bottom of the separation tube 16, and the elastic ball 20 is located in the circular water inlet hole 19. The geothermal water of the aquifer enters between the adjacent separation airbags 17 outside the separation tube 16. Under the action of water pressure, the nearby elastic balls 20 are pushed to move into the separation tube 16, so that the elastic balls 20 no longer block the circular water inlet hole 19, and the geothermal water enters the separation tube 16 through the circular water inlet hole 19.

[0034] When it is necessary to seal the top aquifer, pull the connecting rope 1 upwards, so that the connecting rope 1 drives the slider 3 to slide upwards along the guide tube 15 in the separation tube 16, and the slider 3 drives the innermost blocking tube 5 to move upwards through the connecting bracket 4. Since the clamping plate 8 at the bottom of the inner blocking tube 5 is stuck in the clamping mouth 6 of the outer blocking tube 5, the inner blocking tube 5 can drive the outer blocking tube 5 to move upward synchronously when it moves upward, so that all the blocking tubes 5 can move upward synchronously.

[0035] During the rising process of the blocking tube 5, when the outermost blocking tube 5 reaches the bottom-layer aquifer, it contacts the elastic ball 20 that protrudes into the separation tube 16, and squeezes the elastic ball 20 back into the circular water inlet hole 19. At the same time, under the action of water pressure, the elastic ball 20 is pressed against the outermost blocking tube 5. As the outermost blocking tube 5 moves upward, when the elastic ball 20 moves into the bayonet 6, the elastic ball 20 is stuck in the bayonet 6 and presses against the clamping plate 8 at the bottom of the outermost blocking tube 5. At the same time, the elastic ball 20 stuck in the bayonet 6 presses the middle clamping block 9 on the inner blocking tube 5, and presses the upper clamping block 7, the middle clamping block 9, and the clamping plate 8 at the bottom of the inner blocking tube 5 into the receiving groove 12. At this time, the position of the outermost blocking tube 5 is stuck, and the inner blocking tube 5 continues to move upward.

[0036] By analogy, every time an aquifer is reached, the outermost blocking tube 5 will be stuck in the aquifer to resist the elastic ball 20, so that the elastic ball 20 blocks the circular water inlet hole 19, so that the water in the aquifer cannot enter the separation tube 16.

[0037] The plugging pipe 5 on the top aquifer will not move because the elastic balls 20 are clamped by the clamping plates 8 on the upper and lower sides of the clamping opening 6.

[0038] As for the blocking tube 5 on the bottom-layer aquifer, since the clamping plate 8 at the top of the blocking tube 5 is fixed in the receiving groove 12 by the fixing screws 11, there is no clamping plate 8 to limit the elastic ball 20 on the bottom-layer aquifer. Under the action of its own weight, the blocking tube 5 slowly slides down and separates from the elastic ball 20. After the elastic ball 20 is no longer stuck by the blocking tube 5, the elastic ball 20 moves into the separation tube 16 under the action of water pressure, so that the elastic ball 20 no longer blocks the circular water inlet hole 19, and the geothermal water in the bottom layer enters the separation tube 16 through the circular water inlet hole 19.

[0039] Example 3

[0040] like Figure 1-5 As shown, when other parts are the same as those of Example 2, the difference between this embodiment and Example 2 is that a plurality of water inlet pipes 23 are fixedly arranged at the bottom of the guide pipe 15, and the water inlet pipes 23 are connected to the guide pipe 15, and the top of the guide pipe 15 is connected to the water pump. The water pump extracts the geothermal water in the partition pipe 16 through the guide pipe 15 and the water inlet pipe 23.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-aquifer isolation device for deep geothermal wells, characterized by: The invention comprises a separation tube (16), wherein a plurality of separation airbags (17) are sleeved on the separation tube (16), wherein the separation airbags (17) are annular, and are fixedly connected to the separation tube (16), and the separation airbags (17) are arranged equidistantly along the axial direction of the separation tube (16), and the separation tube (16) is provided with inflatable thin tubes (14) on both sides, and the inflatable thin tubes (14) pass through the plurality of separation airbags (17) in sequence, and the inflatable thin tubes (14) are fixedly connected to the separation airbags (17), and the separation airbags (17) are arranged on the left and right sides of the separation tube (16). A ventilation hole is provided in the portion of the inflatable capillary (14) located inside the separation airbag (17); a first buffer spring (18) is provided between two adjacent separation airbags (17); one end of the first buffer spring (18) is fixedly connected to the inflatable capillary (14); the other end of the first buffer spring (18) is fixedly connected to the elastic ball (20); a circular water inlet hole (19) is provided on one side of the separation tube (16) close to the elastic ball (20); and a circular water inlet hole blocking mechanism is provided inside the separation tube (16).

2. A deep geothermal well multi-aquifer isolation device according to claim 1, characterized in that: A bottom cover (21) is provided at the bottom of the separation tube (16), and the bottom cover (21) is fixedly connected to the bottom end of the separation tube (16).

3. A deep geothermal well multi-aquifer isolation device according to claim 2, characterized in that: The bottom end of the inflatable tube (14) is closed, and the top of the inflatable tube (14) is threadedly connected with a sealing cap.

4. A deep geothermal well multi-aquifer isolation device according to claim 3, characterized in that: The circular water inlet hole blocking mechanism comprises a guide tube (15), the guide tube (15) is in the shape of a quadrangular prism, the bottom end of the guide tube (15) is fixedly connected to the bottom cover (21), and an aquifer isolation assembly is slidably connected to the guide tube (15).

5. A multi-aquifer isolation device for deep geothermal wells according to claim 4, characterized in that: The aquifer isolation assembly comprises a slider (3), the slider (3) is cylindrical, a quadrangular prism-shaped slide groove (2) is provided through the center of the slider (3), the slide groove (2) is plugged into and matched with a guide tube (15), a multi-layer plugging tube (5) is sleeved on the outer side of the slider (3), a connecting bracket (4) is provided between the slider (3) and the innermost plugging tube (5), one end of the connecting bracket (4) is fixedly connected to the slider (3), and the other end of the connecting bracket (4) is fixedly connected to the innermost plugging tube (5), and the top of the slider (3) is fixedly connected to the lower end of the connecting rope (1).

6. A deep geothermal well multi-aquifer isolation device according to claim 5, characterized in that: The aquifer isolation assembly further comprises a bayonet (6), the bayonet (6) being provided on both left and right sides of the plugging tube (5), and receiving grooves (12) being provided on the surface of the plugging tube (5) at both upper and lower sides of the bayonet (6), a locking structure being provided in the receiving groove (12), and the locking structure at the lower part of the inner plugging tube (5) being located in the bayonet (6) on the outer plugging tube (5).

7. A multi-aquifer isolation device for deep geothermal wells according to claim 6, characterized in that: The clamping structure comprises a clamping plate (8), wherein the clamping plate (8) is located in the receiving groove (12), the lower end of the clamping plate (8) is connected to the bottom of the receiving groove (12) through a hinge (10), an upper clamping block (7) is arranged on the top of the clamping plate (8), the upper clamping block (7) is fixedly connected to the clamping plate (8), a middle clamping block (9) is arranged in the middle of the clamping plate (8), the middle clamping block (9) is fixedly connected to the clamping plate (8), a second buffer spring (13) is arranged in the receiving groove (12), one end of the second buffer spring (13) is fixedly connected to the clamping plate (8), and the other end of the second buffer spring (13) is fixedly connected to the receiving groove (12).

8. A multi-aquifer isolation device for deep geothermal wells according to claim 7, characterized in that: The clamping structure further comprises a fixing screw (11), wherein the fixing screw (11) is threadedly connected to the clamping plate (8), a threaded hole is provided in the receiving groove (12), and the fixing screw (11) is threadedly matched with the threaded hole.

9. The water extraction device of the multi-aquifer isolation device for deep geothermal wells according to claim 7, characterized in that: A plurality of water inlet pipes (23) are fixedly arranged at the bottom of the guide pipe (15), the water inlet pipes (23) are in communication with the guide pipe (15), and the top end of the guide pipe (15) is connected to a water pump.

10. The water intake method of the water intake device of the deep geothermal well multi-aquifer isolation device according to claim 9, characterized in that: The method comprises the following steps: after the geothermal water at the bottom layer enters the separation pipe (16), the top end of the guide pipe (15) is connected to a water pump, and the water pump extracts the geothermal water in the separation pipe (16) through the guide pipe (15) and the water inlet pipe (23).

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