A stratified pumping device for deep buried thermal storage test

Abstract

The present invention relates to the technical field of stratified water pumping sampling equipment for experiments, and specifically discloses a stratified water pumping device for sedimentary deep-buried heat storage experiments, which is used to separately pump water from aquifers at different depths in the same test well. The device comprises a casing, a submersible pump and a straightening pipe, wherein the casing is arranged in the test well and passes through several aquifers in sequence, and a water-stop expansion member is provided at the position of the casing located at adjacent aquifers; a partial annular array of the casing located at the same aquifer is provided with several groups of water inlet holes, and a valve plate is driven to rotate by an elastic member so that the valve hole and the water inlet hole are misaligned to prevent water in the current aquifer from entering the casing, thereby realizing stratified water pumping; a plurality of negative pressure sampling tubes are provided in the straightening pipe, and the water body is intermittently sampled through the plurality of negative pressure sampling tubes in the straightening pipe when the submersible pump pumps water from different water layers, thereby solving the problems of difficulty in separating each water layer and sampling during multi-layer pumping, long sampling operation time, increased sampling volume and high manpower consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of stratified water pumping sampling equipment for testing, and in particular to a stratified water pumping device for sedimentation deep-buried heat storage testing. Background Art

[0002] The distribution of underground hot water can be divided into buried type (deep buried type or basin type) and exposed type (or hot spring type). The deep buried type is distributed deep in the sedimentary basin, with large thermal reservoirs and large storage resources.

[0003] After the geothermal well is drilled to the predetermined depth, it is necessary to conduct a heat storage theory study in order to more accurately predict the potential for geothermal development and the degree of resource guarantee. Since the same geothermal well will pass through multiple aquifers, it is necessary to test the following parameters of each aquifer: water yield, water level changes, water temperature, water quality, permeability coefficient, impact radius, recovery capacity and pressure changes. In addition to the water quality test, which requires sampling and testing its composition in the laboratory, the other tests are mainly carried out through hot water pump extraction and some sensors. When sampling water quality, in order to ensure that it can represent the water quality characteristics of the entire water layer, Sampling points need to be evenly set up in the same water layer to avoid concentration in a certain area. The current sampling is mainly carried out by collecting the extracted water in sections, or drilling several sampling wells for separate sampling. When collecting in sections, each water layer needs to be separated to avoid confusion among multiple water layers, which leads to inaccurate sampling. It is difficult to separate each water layer and sample. At the same time, it is necessary to take into account parameters such as pumping water to measure water output and water level changes. The same water layer will take several hours, and after pumping water from multiple layers, the sampling work has problems such as long operation time, increased sampling volume and high manpower consumption. Summary of the Invention

[0004] The purpose of the present invention is to provide a layered pumping device for sedimentary deep-buried heat storage testing, which solves the problems of difficulty in separating each water layer and sampling during multi-layer pumping, long sampling operation time, increased sampling volume and high manpower consumption.

[0005] The present invention is achieved through the following technical solutions: a stratified pumping device for sedimentary deep buried heat storage testing, used to separately pump water from aquifers at different depths in the same test well, comprising a casing, the casing being arranged in the test well and sequentially passing through several aquifers, the casing being provided with a water-stop expansion member at a position adjacent to the aquifer;

[0006] The annular array of the portion of the casing located in the same aquifer is provided with a plurality of groups of water inlet holes, the annular array inside the casing is provided with a plurality of valve plates that slide reciprocally around the inner wall of the casing, and elastic members that are arranged in cooperation with the valve plates, one valve plate corresponds to a group of the water inlet holes, the valve plate is provided with a plurality of valve holes, and the valve plate is driven to rotate by the elastic member to cause the valve holes to be misaligned with the water inlet holes, thereby preventing water in the current aquifer from entering the casing;

[0007] It also includes a submersible pump and a righting pipe, one end of the righting pipe is sealed and sleeved with the submersible pump, a plurality of drive bars are provided in a ring array on the outer wall of the righting pipe, the lower end of the drive bar is conical, and the plurality of valve plates are respectively driven by the drive bars to compress the elastic parts as the righting pipe dives, and the valve hole is aligned with the water inlet hole at the same time.

[0008] Furthermore, a cover plate is sealed at the lower end of the centralizing tube, a partition plate is provided in the inner cavity of the centralizing tube, a sampling cavity is provided between the partition plate and the cover plate; a negative pressure cavity is formed between the partition plate and the submersible pump;

[0009] It also includes a power tube, the power tube is coaxially passed through the cover plate and the partition plate, and the power tube is rotatably connected to the cover plate and the partition plate; the inner cavity of the power tube is provided with an impeller;

[0010] A negative pressure sampling tube arranged in parallel with the power tube is provided in the sampling cavity, a sealing cover is provided for sealing the tube mouth of the negative pressure sampling tube, a main sampling hole is provided on the sealing cover, a slide seat is provided on the sealing cover which slides radially along the sampling cavity, and the slide seat always covers the main sampling hole when sliding, a secondary sampling hole is provided on the slide seat, and a sampling tube is provided in communication with the secondary sampling hole, and an end of the sampling tube away from the slide seat passes through the partition plate and is communicated with the negative pressure cavity;

[0011] A return spring is provided at one end of the slide away from the power tube, and both ends of the return spring abut against the sealing cover and the slide respectively, so that the main sampling hole and the auxiliary sampling hole are misaligned by the return spring;

[0012] The sampling chamber is rotatably provided with a shaft tube, the shaft tube is coaxial with the power tube and is transmission-connected, a cam is sleeved on the shaft tube, and when the cam rotates, the slide moves through its raised portion and compresses the return spring, thereby connecting the main sampling hole with the auxiliary sampling hole.

[0013] Furthermore, a seat ring is coaxially rotatably provided in the sampling cavity, the partition plate is rotatably connected to the sampling cavity, and the partition plate is fixedly connected to the seat ring via a plurality of connecting plates;

[0014] A plurality of negative pressure sampling tubes are arranged in a circular array on the seat ring, and the negative pressure sampling tubes slide radially along the seat ring. When the negative pressure sampling tubes slide to a side close to the center axis of the seat ring, the slide is located on the moving path of the raised portion on the cam.

[0015] Furthermore, a drive shaft is provided on the centralizing tube, and the drive shaft is arranged radially along the centralizing tube. A driving bevel gear is provided on the portion of the drive shaft located in the sampling cavity, and a driven bevel gear is coaxially provided on the seat ring, and the driving bevel gear is meshed with the driven bevel gear.

[0016] A driving gear is provided after a driving bar is passed through the end of the driving shaft away from the active bevel gear. Several sections of racks are arranged at intervals on the inner wall of the casing. A rack is provided on the part of the casing located in the same aquifer. When the driving gear meshes with one of the racks and passes through the current rack as the centralizing tube dives, the driven bevel gear drives the seat ring to rotate 360° / N (N=the number of negative pressure sampling tubes).

[0017] Furthermore, it also includes a connecting rod, a sliding rod, a coil spring and a push head, a sliding cavity is coaxially provided in the driving shaft, the sliding rod is slidably provided in the sliding cavity, an end of the sliding rod close to the active bevel gear is connected to the push head through the connecting rod, an end of the sliding cavity close to the active bevel gear is provided with a locking cap, the connecting rod slides through the locking cap, the coil spring is sleeved on the connecting rod, and the two ends of the coil spring are respectively in contact with the sliding rod and the locking cap;

[0018] A limit bar is provided on the part of the sleeve below the rack, and a wedge surface is provided on one end of the limit bar close to the rack. When the slide rod slides through the wedge surface and abuts against the limit bar, the push head pushes the negative pressure sampling tube to one side of the center axis of the seat ring.

[0019] Furthermore, a plurality of rollers are provided in an annular array on the seat ring, the rollers are arranged in parallel with the negative pressure sampling tube, and a negative pressure sampling tube is provided between adjacent rollers;

[0020] An annular belt is wound around several of the rotating rollers, and the outer belt surface of the annular belt abuts against several of the negative pressure sampling tubes. When the push head pushes one of the negative pressure sampling tubes toward one end of the central axis of the seat ring, the negative pressure sampling tube drives the annular belt abutting against it to be concave inward, while the remaining negative pressure sampling tubes are driven toward the outside of the seat ring by the annular belt, thereby causing the slides on the remaining negative pressure sampling tubes to deviate from the moving path of the raised part on the cam.

[0021] Furthermore, a piston is slidably provided in the negative pressure sampling tube, and a plurality of negative pressure springs are provided at one end of the piston away from the sealing cover, and the two ends of the negative pressure springs are respectively connected to the bottom of the negative pressure sampling tube and the piston.

[0022] Furthermore, an upper mounting ring and a lower mounting ring are provided at intervals in a portion of the casing located in the same aquifer, a first slide rail is provided at the bottom of the upper mounting ring, and a second slide rail is provided at the top of the lower mounting ring, and the upper and lower ends of the valve plate are slidably provided on the first slide rail and the second slide rail respectively;

[0023] The upper mounting ring and the lower mounting ring are both provided with a plurality of fractures in an annular array, and the plurality of fractures are respectively used for the plurality of driving bars to pass through;

[0024] There are two valve plates between adjacent fractures in the same horizontal plane, and a plurality of elastic members are provided between the two valve plates, with two ends of the elastic members acting on the two valve plates respectively;

[0025] The two valve plates located on both sides of the fracture are in contact with each other at one end away from the elastic member, and a V-shaped opening is provided on the top between the two valve plates located on both sides of the fracture;

[0026] The rack is located below the lower mounting ring.

[0027] Furthermore, a plurality of limiting grooves are provided in an annular array on the inner wall of the casing, and the plurality of limiting grooves correspond to the plurality of fractures one by one. A limiting slide is provided at one end of the driving bar away from the centralizing tube, and the limiting slide is slidably placed in the limiting groove;

[0028] The rack is located on a side wall of the limiting groove;

[0029] The limiting strip is located at the bottom of the limiting groove.

[0030] Furthermore, the power tube is transmission-connected to the shaft tube via a planetary reducer.

[0031] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0032] 1. When the driving bar separates the two valve plates abutting each other, the water in the current aquifer can enter the casing, and then enter the centralizing tube from the bottom of the centralizing tube and is then pumped to the ground by the submersible pump. After the pumping test of the current aquifer is completed, the centralizing tube and the submersible pump continue to dive into the next water layer. When the driving bar completely passes through the fracture of the lower mounting ring, that is, after it is separated from between the two valve plates, all the valve holes of the current aquifer are misaligned with the corresponding water inlet holes, and the water in the current aquifer no longer enters the casing. Similarly, after the driving bar on the centralizing tube enters the fracture of the next water layer and aligns the valve holes of the next water layer with the water inlet holes, the submersible pump can perform a pumping test on the water layer in which it is located. According to this operation, the pumping operation of all water layers can be realized. It is simple and convenient, and adjacent water layers are not easily confused.

[0033] 2. When water flows through the power tube and into the negative pressure chamber, the water flow drives the impeller to rotate and then drives the entire power tube to rotate; the power tube is connected to the shaft tube through a planetary reducer, and the shaft tube drives the cam to rotate. Through the periodic rotation of the cam, the main sampling hole and the auxiliary sampling hole are periodically connected, and the negative pressure sampling tube intermittently samples the extracted water body, ensuring the normal progress of the pumping test while uniformly and automatically sampling the extracted water body, improving sampling efficiency and saving manpower.

[0034] 3. As the centralizing tube dives, the driving gear engages with the rack of the current aquifer and passes through the current rack. The driving gear rotates, and then drives the driven gear to rotate through the driving shaft. The driven bevel gear drives the seat ring to rotate 360° / N (N=the number of negative pressure sampling tubes). Each aquifer uses a negative pressure sampling tube, which is pushed to the inside of the seat ring and cooperates with the cam for intermittent sampling.

[0035] 4. When the slide rod slides through the wedge surface and abuts against the limit bar, the push head pushes the negative pressure sampling tube to one side of the center axis of the seat ring, thereby moving the slide on the negative pressure sampling tube to the rotation path of the raised part on the cam.

[0036] 5. When the push head pushes a negative pressure sampling tube to move toward one end of the center axis of the seat ring, the negative pressure sampling tube drives the annular belt abutting it to be concave inward, while the remaining negative pressure sampling tubes are driven toward the outside of the seat ring by the annular belt, thereby causing the slides on the remaining negative pressure sampling tubes to break away from the moving path of the raised part on the cam, ensuring that when the slide rod is gradually pushed toward the inside of the casing by the wedge surface of the limit bar, the push head pushes the new negative pressure sampling tube replaced by the seat ring driven by the gear to rotate to move toward the inside of the seat ring, and the previous negative pressure sampling tube on the inside of the seat ring and the remaining negative pressure sampling tubes are all pushed to the outside end of the seat ring by the annular belt, ensuring that the slide on one and only one negative pressure sampling tube abutted by the push head is located on the rotation path of the raised part on the cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic cross-sectional view of a layered pumping device for deep-buried heat storage testing provided by the present invention;

[0039] Figure 2 for Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0040] Figure 3 for Figure 1 Schematic diagram of the structure of the cross section at FF;

[0041] Figure 4 for Figure 1 A magnified schematic diagram of the structure at A in the middle;

[0042] Figure 5 for Figure 4 A magnified schematic diagram of the structure at C in the middle;

[0043] Figure 6 for Figure 4 Structural diagram of the cross section at DD in the middle;

[0044] Figure 7 for Figure 4 A magnified schematic diagram of the structure at E in the middle;

[0045] Icons: 1. Test well, 2. Aquifer, 3. Casing, 31. Water inlet, 32. Upper mounting ring, 321. First slide rail, 33. Lower mounting ring, 331. Second slide rail, 34. Fracture, 35. Limit groove, 4. Water-stop expansion member, 5. Valve plate, 51. Elastic member, 52. Valve hole, 53. V-shaped mouth, 6. Submersible pump, 7. Centralizing tube, 71. Drive bar, 711. Limit slide bar, 72. Cover plate, 73. Partition plate, 74. Sampling chamber, 75. Negative pressure chamber, 76. Power tube, 761. Impeller, 762. Shaft tube, 763. Cam, 77. Seat Ring, 771, connecting plate, 772, driven bevel gear, 78, driving shaft, 781, active bevel gear, 782, driving gear, 783, rack, 784, connecting rod, 785, slide bar, 786, coil spring, 787, push head, 788, slide cavity, 789, locking cap, 790, limit strip, 791, roller, 792, ring belt, 8, negative pressure sampling tube, 81, sealing cover, 82, main sampling hole, 83, slide seat, 831, auxiliary sampling hole, 84, sampling tube, 85, reset spring, 86, piston, 87, negative pressure spring, 9, planetary reducer. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0048] Reference Figures 1 to 7As shown, this embodiment provides a layered pumping device for sedimentary deep-buried heat storage testing, which is used to pump water from aquifers 2 of different depths in the same test well 1. The device includes a casing 3, which is arranged in the test well 1 and penetrates several aquifers 2 in sequence. The casing 3 is provided with a water-stop expansion member 4 at a position adjacent to the aquifer 2. The water-stop expansion member 4 can be made of a rubber material that swells when exposed to water. After swelling when exposed to water, the casing 3 and the wall of the test well 1 are sealed. As another embodiment, the water-stop expansion member 4 can also be an inflatable airbag. The gap between the casing 3 and the wall of the test well 1 is sealed by inflating the airbag, thereby separating different water layers and avoiding inaccurate pumping tests caused by mutual flow between adjacent or multiple water layers. After the drilling of the test well 1 is completed and the drill rod and drill bit are retracted, the casing 3 is lowered. After the water-stop expansion member 4 is in place, it can be used to pour concrete between the casing 3 and the test well 1, so that the casing 3 and the test well 1 are cast into one.

[0049] like Figure 1 As shown, the partial annular array of the sleeve 3 located between adjacent water-stop expansion members 4 is provided with several groups of water inlet holes 31, and each group of water inlet holes 31 includes several independent water inlet holes 31. The annular array inside the sleeve 3 is provided with several valve plates 5 that slide back and forth circumferentially around the inner wall of the sleeve 3 and elastic members 51 arranged in cooperation with the valve plates 5. One valve plate 5 corresponds to one group of water inlet holes 31, and the valve plate 5 is provided with several valve holes 52. The valve plate 5 is driven to rotate by the elastic member 51 to align or misalign the several valve holes 52 on the valve plate 5 with the corresponding group of water inlet holes 31. The misalignment of the water inlet holes 31 prevents water in the current aquifer 2 from entering the sleeve 3; a stepped groove can be provided at one end of the water inlet hole 31 near the valve plate 5 to install a rubber sealing ring to ensure that the valve plate 5 can rotate to block the water inlet hole 31 while preventing water from entering between the valve plate 5 and the sleeve 3. Of course, other designs can also be used to ensure sealing, and there is no restriction here.

[0050] More specifically, Figure 1-Figure 3As shown, an upper mounting ring 32 and a lower mounting ring 33 are provided at intervals between adjacent water-stop expansion members 4 in the casing 3. The lower mounting ring 33 is generally located at the bottom of the aquifer 2. A first slide rail 321 is provided at the bottom of the upper mounting ring 32, and a second slide rail 331 is provided at the top of the lower mounting ring 33. The upper and lower ends of the valve plate 5 are respectively slidably provided on the first slide rail 321 and the second slide rail 331; a plurality of fractures 34 are provided in an annular array on both the upper mounting ring 32 and the lower mounting ring 33; two valve plates 5 are provided between the upper mounting ring 32 and the lower mounting ring 33 between adjacent fractures 34 in the same horizontal plane, and a plurality of elastic members 51 are provided between the two valve plates 5, with the ends of the elastic members 51 acting on the two valve plates 5 respectively; The two valve plates 5 located on both sides of the fracture 34 abut against each other at one end away from the elastic member 51. Here, the valve plates 5 on both sides of the fracture 34 are each driven by a group of elastic members 51, so that the two abut against each other at the fracture 34. The elastic member 51 can be a traditional spiral spring or a torsion spring, and there is no restriction here. Then, it is only necessary to insert an object from the fracture 34 between the two abutting valve plates 5, and then the two valve plates 5 can be moved to both sides, so that the valve hole 52 is aligned with the water inlet hole 31 while compressing the elastic member 51. After the object passes through, the two valve plates 5 abut against each other again under the action of the elastic member 51, and the valve hole 52 and the water inlet hole 31 are separated from each other, so that the water in the current aquifer 2 cannot enter the casing 3.

[0051] More specifically, it also includes a submersible pump 6 and a centralizing pipe 7. The centralizing pipe 7 can be modified with a section of drill pipe to save material. One end of the centralizing pipe 7 is sealed and sleeved with the submersible pump 6. The two can move synchronously. When lowering the submersible pump, a steel cable can be used to cooperate with a winch to lower it, or a drill pipe can be used to lower it. As another embodiment, Figure 1 As shown, when the aquifer 3 is deeper, the centralizing tube 7 does not need to be sealed with the submersible pump 6. As long as the submersible pump 6 is inside the centralizing tube, the water in the water layer will rise along the test well 1 under the action of underground pressure, that is, the submersible pump 6 does not have to go down to the depth of the aquifer 3 to pump water. At this time, the lowering of the centralizing tube 7 can be carried out with the help of a traditional drill pipe.

[0052] The outer wall of the centralizing tube 7 is provided with a plurality of driving bars 71 in an annular array. The lower end of the driving bar 71 is tapered. As the centralizing tube 7 dives, the plurality of valve plates 5 are driven by the driving bars 71 to compress the elastic member 51 and align the valve hole 52 with the water inlet hole 31. In specific implementation, the centralizing tube 7 is mainly used to ensure that the submersible pump 6 is coaxial with the casing 3. At the same time, the plurality of fractures 34 are respectively used for the passage of the plurality of driving bars 71. A V-shaped opening 53 is provided on the top between the two valve plates 5 on both sides of the fracture 34, that is, the valve plates 5 abut against each other at the fracture 34. There is a V-shaped opening at the top between the two valve plates 5. The V-shaped opening 53 is used to insert the tapered portion of the lower end of the driving bar 71. As the driving bar 71 continues to be inserted between the two valve plates 5, the two valve plates 5 are pushed to both sides, compressing the elastic member 51 while aligning the valve hole 52 with the water inlet hole 31. When the driving bar 71 moves out of the break 34 on the lower mounting ring 33 to the next water layer, the two valve plates 5 at the break 34 of the current aquifer 2 are reset under the action of the elastic member 51 and abut against each other, and at the same time, the valve hole 52 is aligned with the water inlet hole 31. 31 is misaligned, and then the driving bar 71 separates the two valve plates 5 abutting each other. The water in the current aquifer 2 can enter the casing 3, and then enter the centralizing pipe 7 from the bottom of the centralizing pipe 7, and then be pumped to the ground by the submersible pump 6. After the pumping test of the current aquifer 2 is completed, the centralizing pipe 7 and the submersible pump 6 continue to dive into the next water layer. When the driving bar 71 completely passes through the fracture 34 of the lower mounting ring 33, that is, after it is separated from between the two valve plates 5, all the valve holes 52 in the current aquifer 2 are misaligned with the corresponding water inlet holes 31. The water in the water layer 2 will no longer enter the casing 3. Similarly, after the driving bar 71 on the straightening tube 7 enters the fracture 34 of the next water layer and aligns the valve hole 52 of the next water layer with the water inlet hole 31, the submersible pump 6 can perform a water pumping test on the water layer in which it is located. According to this operation, the pumping operation of all water layers can be achieved. It is simple and convenient, and adjacent water layers are not easily confused. However, when the submersible pump 6 enters the next water layer, the casing 3 at the current depth contains part of the water of the previous water layer, which can be ignored or extracted first, and this part of water is not used as a test sample.

[0053] like Figure 1 and Figure 4As shown, the lower end of the straightening tube 7 is sealed with a cover plate 72, and the inner cavity of the straightening tube 7 is provided with a partition plate 73, and a sampling cavity 74 is provided between the partition plate 73 and the cover plate 72; a negative pressure cavity 75 is formed between the partition plate 73 and the submersible pump 6; it also includes a power tube 76, which is coaxially passed through the cover plate 72 and the partition plate 73, and the power tube 76 is rotatably connected to the cover plate 72 and the partition plate 73; an impeller 761 is provided in the inner cavity of the power tube 76; and then when the submersible pump 6 pumps water under negative pressure, a negative pressure is formed in the negative pressure cavity 75, and then the water entering the casing 3 is sucked into the negative pressure cavity 75 through the power tube 76, and the power tube 76 rotates under the action of the impeller 761. The impeller 761 here can be a spiral blade, or a water turbine or a blade, etc. When the water flows through the power tube 76 and enters the negative pressure cavity 75, the water flow drives the impeller 761 to rotate and then drives the entire power tube 76 to rotate.

[0054] More specifically, Figure 4-Figure 7As shown, a negative pressure sampling tube 8 arranged in parallel with the power tube 76 is provided in the sampling cavity 74, and a sealing cover 81 is provided at the tube mouth of the negative pressure sampling tube 8. A main sampling hole 82 is provided on the sealing cover 81, and a slide 83 is provided on the sealing cover 81 to slide along the radial direction of the sampling cavity 74. When the slide 83 slides, it always covers the main sampling hole 82. A secondary sampling hole 831 is provided through the slide 83, and a sampling tube 84 is provided in communication with the secondary sampling hole 831. The end of the sampling tube 84 away from the slide 83 passes through the partition plate 73 and is communicated with the negative pressure cavity 75. In specific implementation, the sampling tube 84 adopts a The pipeline with a certain elasticity can meet the requirements of sliding along one end thereof with the slide 83. The sealing cover 81 is provided with a track for limiting and guiding the slide 83. The end of the slide 83 away from the power tube 76 is provided with a return spring 85. The two ends of the return spring 85 are respectively in contact with the sealing cover 81 and the slide 83. The top of the sealing cover 81 is provided with a raised support point for providing a force to support the return spring 85, and then the other end of the spring acts on the slide 83, and the main sampling hole 82 and the auxiliary sampling hole 831 are misaligned by the return spring 85; the sampling chamber 74 is provided with a shaft tube 762 for rotation, and the shaft tube 762 and the power tube 76 is coaxial and transmission connected. More specifically, the power tube 76 is transmission connected to the shaft tube 762 through the planetary reducer 9. The rotation speed of the shaft tube 762 is lower than that of the power tube 76, but it has a higher torque. The rotation speed of the shaft tube 762 can be controlled by controlling the reduction ratio of the planetary reducer 9; a cam 763 is sleeved on the shaft tube 762. When the cam 763 rotates, the slide 83 moves through its raised portion and compresses the reset spring 85, thereby connecting the main sampling hole 82 with the auxiliary sampling hole 831. After the rotation speed of the shaft tube 762 is controlled by the planetary reducer 9, the rotation of the cam 763 can be controlled. Speed, when the raised part of the cam 763 rotates, it pushes the slider to move to the outside of the straightening tube 7, thereby aligning the main sampling hole 82 with the auxiliary sampling hole 831. At this time, the negative pressure in the negative pressure sampling tube 8 absorbs the water in the negative pressure chamber 75 through the sampling tube 84, and then the slide 83 is reset by the reset spring 85, and then the cam 763 rotates periodically, and then the main sampling hole and the auxiliary sampling hole are periodically connected, and the negative pressure sampling tube 8 intermittently samples the extracted water body, ensuring the normal progress of the water pumping test while uniformly and automatically sampling the extracted water body, thereby improving sampling efficiency and saving manpower.

[0055] like Figure 4-Figure 7 As shown, a seat ring 77 is coaxially rotatably provided in the sampling chamber 74, the partition plate 73 is rotatably connected to the sampling chamber 74, and the partition plate 73 is fixedly connected to the seat ring 77 via a plurality of connecting plates 771; thus, the seat ring 77 and the partition plate 73 are fixed to each other and can rotate synchronously.

[0056] like Figure 4-Figure 7As shown, a plurality of negative pressure sampling tubes 8 are arranged in a circular array on the seat ring 77, and the negative pressure sampling tubes 8 slide radially along the seat ring 77. When the negative pressure sampling tube 8 slides to the side close to the central axis of the seat ring 77, the slide 83 is located on the moving path of the raised part of the cam 763. Several negative pressure sampling tubes 8 are used for sampling operations of water-blocked layers. In the initial state, each negative pressure sampling tube 8 is located on the outside of the seat ring 77. When a certain negative pressure sampling tube 8 is needed, it is only necessary to push the negative pressure sampling tube 8 toward the inside of the seat ring 77 until the slide 83 is located on the rotation path of the raised part of the cam 763. The raised part of the cam 763 can be used to drive the slide 83 to reset its gap during rotation, thereby making the main sampling hole and the auxiliary sampling hole intermittently connected.

[0057] More specifically, a plurality of limit grooves 35 are provided in a circular array on the inner wall of the casing 3, and the plurality of limit grooves 35 correspond to and are connected to the plurality of fractures 34 respectively. A limit slide 711 is provided at the end of the driving bar 71 away from the straightening tube 7, and the limit slide 711 is slidably placed in the limit groove 35; the limit slide 711 cooperates with the limit groove 35 to prevent the straightening tube 7 from deflecting, thereby ensuring that the submersible pump 6 is coaxial with the casing 3, and at the same time ensuring that the driving bar 71 will not deflect in the casing 3, and the width of the driving bar 71 is greater than the width of the limit groove 35, so that the driving bar 71 is slidably connected to the inner wall of the casing 3 where the limit groove 35 is located, and the limit slide 711 only extends into the limit groove 35 and does not contact the bottom of the limit groove 35.

[0058] More specifically, a drive shaft 78 is provided on the straightening tube 7, and the drive shaft 78 is arranged radially along the straightening tube 7. The part of the drive shaft 78 located in the sampling chamber 74 is provided with a driving bevel gear 781, and a driven bevel gear 772 is coaxially provided on the seat ring 77, and the driving bevel gear 781 is engaged with the driven bevel gear 772; a drive bar 71 is provided on the end of the drive shaft 78 away from the driving bevel gear 781 and a drive gear 782 is provided thereafter. Several sections of racks 783 are provided at intervals on the inner wall of the casing 3, and a rack 783 is provided on the part of the casing 3 located in the same aquifer 2, and the rack 783 is located below the lower mounting ring 33. During specific implementation, the driving gear 782 is located in a limiting groove 35, and the rack 783 is located on a side wall of the limiting groove 35; the rack is closer to the bottom of the limiting slide, and it will not interfere with the limiting slide 711. As the straightening tube 7 dives, the driving gear 782 engages with the rack 783 of the current aquifer 2 and passes through the current rack 783. The driving gear 782 rotates, and then drives the driven gear to rotate through the driving shaft 78. The driven bevel gear 772 drives the seat ring 77 to rotate 360° / N (N=the number of negative pressure sampling tubes 8). Each aquifer 2 uses a negative pressure sampling tube 8, which is pushed to the inside of the seat ring 77 and cooperates with the cam 763 for intermittent sampling.

[0059] like Figure 4-Figure 7The cam 785 is provided with a spring 786 which is adapted to engage the engagement member 787 and to engage the engagement member 788. The cam 786 is adapted to engage the engagement member 789 and to engage the engagement member 789.

[0060] The portion of the sleeve 3 below the rack 783 is provided with a limit bar 790, which is located at the bottom of the limit groove 35 and is integrally formed with it, except that the limit bar 790 is provided with a wedge surface at one end close to the rack 783. When the slide rod 785 slides through the wedge surface and abuts against the limit bar 790, the push head 787 pushes the negative pressure sampling tube 8 to one side of the central axis of the seat ring 77, thereby moving the slide 83 on the negative pressure sampling tube 8 to the rotation path of the raised part on the cam 763.

[0061] More specifically, Figure 4-Figure 6 As shown, a plurality of rollers 791 are arranged in an annular array on the seat ring 77. The rollers 791 are arranged parallel to the negative pressure sampling tube 8, and a negative pressure sampling tube 8 is arranged between adjacent rollers 791; a ring belt 792 is wound around the plurality of rollers 791, and the outer surface of the ring belt 792 abuts against the plurality of negative pressure sampling tubes 8. When the push head 787 pushes a negative pressure sampling tube 8 toward one end of the center axis of the seat ring 77, the negative pressure sampling tube 8 drives the ring belt 792 abutting against it to be concave inward, and the remaining negative pressure sampling tubes 8 are driven toward the outside of the seat ring 77 by the ring belt 792, thereby causing the slide seats 83 on the remaining negative pressure sampling tubes 8 to be The moving path of the raised part of the cam 763 is separated from the movement path, ensuring that when the slide bar 785 is gradually pushed toward the inside of the sleeve 3 by the wedge surface of the limit bar 790, the push head 787 pushes the new negative pressure sampling tube 8 that has just been replaced by the driving gear 782 to drive the seat ring 77 to rotate, and the previous negative pressure sampling tube 84 on the inside of the seat ring 77 and the remaining negative pressure sampling tubes 84 are all pushed to the outside end of the seat ring 77 by the annular belt 792, ensuring that there is only one slide 83 on the negative pressure sampling tube 8 that is supported by the push head 787 and is located on the rotation path of the raised part of the cam 763.

[0062] When implementing it specifically, Figure 4 and Figure 7As shown, a piston 86 is slidingly provided in the negative pressure sampling tube 8, and a plurality of negative pressure springs 87 are provided at one end of the piston 86 away from the sealing cover 81. The two ends of the negative pressure spring 87 are respectively connected to the bottom of the negative pressure sampling tube 8 and the piston 86, and then the piston 86 is pulled toward the bottom side of the negative pressure sampling tube 8 by the negative pressure spring 87, so that a negative pressure is generated between the piston 86 and the sealing cover 81. Then, when the main sampling hole and the auxiliary sampling hole are connected, water in the negative pressure chamber 75 is intermittently extracted through the sampling tube 84, and then until the submersible pump 6 completes the water pumping, the negative pressure sampling tube 8 also collects an appropriate amount of sample. The sample has high accuracy and all mechanical structure sampling is adopted, which is reliable and low in cost.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A stratified pumping device for deep-buried sedimentary heat storage testing, used to separately pump water from aquifers (2) at different depths within the same test well (1), characterized by: The casing (3) is provided in the test well (1) and penetrates the plurality of aquifers (2) in sequence, and a water-stop expansion member (4) is provided at a portion of the casing (3) adjacent to the aquifers (2); The sleeve (3) is located in a partial annular array in the same aquifer (2) and is provided with a plurality of groups of water inlet holes (31). The inner annular array of the sleeve (3) is provided with a plurality of valve plates (5) that slide reciprocally around the inner wall of the sleeve (3) and an elastic member (51) that is arranged in cooperation with the valve plate (5). One valve plate (5) corresponds to a group of the water inlet holes (31). The valve plate (5) is provided with a plurality of valve holes (52). The elastic member (51) drives the valve plate (5) to rotate so that the valve holes (52) and the water inlet holes (31) are misaligned, thereby preventing water in the current aquifer (2) from entering the sleeve (3). It also includes a submersible pump (6) and a righting pipe (7), one end of the righting pipe (7) is sealed and sleeved with the submersible pump (6), and a plurality of driving bars (71) are provided in an annular array on the outer wall of the righting pipe (7), and the lower ends of the driving bars (71) are tapered. When the righting pipe (7) dives, the plurality of valve plates (5) are respectively driven by the driving bars (71) to compress the elastic member (51) and simultaneously align the valve hole (52) with the water inlet hole (31); An upper mounting ring (32) and a lower mounting ring (33) are provided at intervals in a portion of the casing (3) located in the same aquifer (2); a first slide rail (321) is provided at the bottom of the upper mounting ring (32); a second slide rail (331) is provided at the top of the lower mounting ring (33); and upper and lower ends of the valve plate (5) are slidably provided on the first slide rail (321) and the second slide rail (331), respectively. A plurality of cutouts (34) are provided in a circular array on the upper mounting ring (32) and the lower mounting ring (33), and the cutouts (34) are respectively used for the passage of the plurality of drive bars (71); There are two valve plates (5) between the adjacent fractures (34) in the same horizontal plane, and a plurality of elastic members (51) are provided between the two valve plates (5), with both ends of the elastic members (51) acting on the two valve plates (5) respectively. The two valve plates (5) located on both sides of the fracture (34) abut against each other at their ends away from the elastic member (51), and a V-shaped opening (53) is provided at the top between the two valve plates (5) located on both sides of the fracture (34); A plurality of limiting grooves (35) are provided in a circular array on the inner wall of the sleeve (3), and the plurality of limiting grooves (35) correspond one to one with the plurality of fractures (34). A limiting slide bar (711) is provided at one end of the driving bar (71) away from the straightening tube (7), and the limiting slide bar (711) is slidably placed in the limiting groove (35).

2. A stratified pumping device for deep buried heat storage test according to claim 1, characterized in that: The lower end of the centralizing tube (7) is sealed with a cover plate (72), the inner cavity of the centralizing tube (7) is provided with a partition plate (73), a sampling cavity (74) is provided between the partition plate (73) and the cover plate (72); a negative pressure cavity (75) is formed between the partition plate (73) and the submersible pump (6); It also includes a power tube (76), the power tube (76) coaxially passing through the cover plate (72) and the partition plate (73), the power tube (76) being rotatably connected to the cover plate (72) and the partition plate (73); an impeller (761) is provided in the inner cavity of the power tube (76); A negative pressure sampling tube (8) arranged in parallel with the power tube (76) is provided in the sampling cavity (74), a sealing cover (81) is provided at the tube mouth of the negative pressure sampling tube (8), a main sampling hole (82) is provided on the sealing cover (81), a slide seat (83) sliding along the radial direction of the sampling cavity (74) is provided on the sealing cover (81), the slide seat (83) always covers the main sampling hole (82) when sliding, a secondary sampling hole (831) is provided on the slide seat (83), a sampling tube (84) is provided in communication with the secondary sampling hole (831), and an end of the sampling tube (84) away from the slide seat (83) passes through the partition plate (73) and is communicated with the negative pressure cavity (75); A return spring (85) is provided at one end of the slide (83) away from the power tube (76), and both ends of the return spring (85) are respectively in contact with the sealing cover (81) and the slide (83), so that the main sampling hole (82) and the auxiliary sampling hole (831) are dislocated by the return spring (85); The sampling chamber (74) is rotatably provided with a shaft tube (762), the shaft tube (762) being coaxial with the power tube (76) and being transmission-connected thereto, and a cam (763) being sleeved on the shaft tube (762). When the cam (763) rotates, the slide seat (83) is moved through its raised portion and the return spring (85) is compressed, thereby connecting the main sampling hole (82) with the auxiliary sampling hole (831).

3. A stratified pumping device for deep buried heat storage test according to claim 2, characterized in that: A seat ring (77) is coaxially rotatably provided in the sampling cavity (74), the partition plate (73) is rotatably connected to the sampling cavity (74), and the partition plate (73) is fixedly connected to the seat ring (77) via a plurality of connecting plates (771); A plurality of negative pressure sampling tubes (8) are provided in an annular array on the seat ring (77), and the negative pressure sampling tubes (8) slide radially along the seat ring (77). When the negative pressure sampling tubes (8) slide to a side close to the center axis of the seat ring (77), the slide seat (83) is located on the moving path of the raised portion on the cam (763).

4. A stratified pumping device for deep-buried sedimentation heat storage testing according to claim 3, characterized in that: A drive shaft (78) is provided on the centralizing tube (7), and the drive shaft (78) is arranged radially along the centralizing tube (7). A driving bevel gear (781) is provided on the portion of the drive shaft (78) located in the sampling cavity (74). A driven bevel gear (772) is coaxially provided on the seat ring (77), and the driving bevel gear (781) is meshed with the driven bevel gear (772). The driving shaft (78) is provided with a driving bar (71) at one end away from the active bevel gear (781), and a driving gear (782) is provided thereafter. A plurality of racks (783) are provided at intervals on the inner wall of the casing (3). The portion of the casing (3) located in the same aquifer (2) is provided with a rack (783). When the driving gear (782) engages with a rack (783) and passes through the current rack (783) as the straightening tube (7) dives, the driven bevel gear (772) drives the seat ring (77) to rotate 360° / N, where N = the number of negative pressure sampling tubes (8).

5. The stratified pumping device for deep-buried sedimentation heat storage test according to claim 4, characterized in that: It also includes a connecting rod (784), a sliding rod (785), a coil spring (786) and a push head (787), wherein a sliding cavity (788) is coaxially provided in the driving shaft (78), the sliding rod (785) is slidingly provided in the sliding cavity (788), the end of the sliding rod (785) close to the active bevel gear (781) is connected to the push head (787) through the connecting rod (784), the end of the sliding cavity (788) close to the active bevel gear (781) is provided with a locking cap (789), the connecting rod (784) slides through the locking cap (789), the coil spring (786) is sleeved on the connecting rod (784), and the two ends of the coil spring (786) are respectively in contact with the sliding rod (785) and the locking cap (789); A limit bar (790) is provided on the portion of the sleeve (3) below the rack (783), and a wedge surface is provided on one end of the limit bar (790) close to the rack (783). When the slide rod (785) slides through the wedge surface and abuts against the limit bar (790), the push head (787) pushes the negative pressure sampling tube (8) to one side of the center axis of the seat ring (77).

6. The stratified pumping device for deep-buried sedimentation heat storage test according to claim 5, characterized in that: A plurality of rollers (791) are provided in an annular array on the seat ring (77), the rollers (791) are arranged in parallel with the negative pressure sampling tube (8), and a negative pressure sampling tube (8) is provided between adjacent rollers (791); A ring belt (792) is wound around a number of the rotating rollers (791), and the outer surface of the ring belt (792) abuts against a number of the negative pressure sampling tubes (8). When the push head (787) pushes one of the negative pressure sampling tubes (8) to move toward one end of the center axis of the seat ring (77), the negative pressure sampling tube (8) drives the ring belt (792) abutting against it to be concave inward, while the remaining negative pressure sampling tubes (8) are driven toward the outside of the seat ring (77) by the ring belt (792), thereby causing the slides (83) on the remaining negative pressure sampling tubes (8) to separate from the moving path of the raised portion on the cam (763).

7. A stratified pumping device for sedimentary deep buried heat storage testing according to any one of claims 2 to 6, characterized in that: A piston (86) is slidably provided in the negative pressure sampling tube (8), and a plurality of negative pressure springs (87) are provided at one end of the piston (86) away from the sealing cover (81), and the two ends of the negative pressure springs (87) are respectively connected to the bottom of the negative pressure sampling tube (8) and the piston (86).

8. The stratified pumping device for deep-buried sedimentation heat storage test according to claim 6, characterized in that: The rack rail (783) is located below the lower mounting ring (33).

9. The stratified pumping device for deep-buried sedimentation heat storage test according to claim 8, characterized in that: The rack rail (783) is located on a side wall of the limiting groove (35); and the limiting bar (790) is located at the bottom of the limiting groove (35).

10. The stratified pumping device for deep-buried sedimentation heat storage test according to claim 9, characterized in that: The power tube (76) is transmission-connected to the shaft tube (762) via a planetary reducer (9).

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