Layered water pumping device for sedimentary deeply-buried heat storage test

Abstract

The invention relates to the technical field of layered water pumping sampling equipment for tests, and particularly discloses a layered water pumping device for a sedimentary deeply-buried heat storage test, which is used for respectively pumping water from water-bearing layers with different depths in the same test well, and comprises a sleeve, a submersible pump and a righting pipe, the sleeve is arranged in the test well and sequentially penetrates out of a plurality of water-bearing layers, and the righting pipe is connected with the submersible pump; a water stop expansion piece is arranged at the part, adjacent to the aquifer, of the sleeve; multiple sets of water inlet holes are formed in the part, located in the same aquifer, of the sleeve in an annular array mode, the elastic piece drives the valve plate to rotate so that the valve holes and the water inlet holes can be staggered, water in the current aquifer can be prevented from entering the sleeve, and then layered water pumping is achieved. A plurality of negative pressure sampling pipes are arranged in the centralizing pipe, intermittent sampling is conducted on water when the submersible pump pumps water on different water layers through the negative pressure sampling pipes in the centralizing pipe, and the problems that during multi-layer water pumping, the difficulty of separating each water layer and sampling is large, the sampling operation time is long, the sampling amount is increased, and manpower consumption is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of layered pumping and sampling equipment for experiments, and in particular, to a layered pumping device for sediment buried deep geothermal reservoir experiments. Background Art

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

[0003] After the geothermal well reaches the predetermined depth, it is necessary to first conduct theoretical research on the geothermal reservoir to more accurately predict the potential of geothermal development and the degree of resource guarantee; since the same geothermal well will pass through multiple aquifers, it is necessary to detect the following parameters for each aquifer: water yield, water level change, water temperature, water quality, permeability coefficient, influence radius, recovery ability, and pressure change. Except for water quality detection, which requires sampling and laboratory analysis of its components, the other parameters are mainly detected by pumping with a hot water pump and some sensors. When sampling water quality, in order to ensure that the sample can represent the water quality characteristics of the entire water layer, sampling points need to be evenly set within the same water layer, so as to avoid concentrating in a certain area. Currently, sampling is mainly carried out by collecting water in segments or drilling several sampling wells separately for sampling. When collecting water in segments, it is necessary to separate each water layer to avoid confusion between multiple water layers, resulting in inaccurate sampling. The difficulty of separating each water layer and sampling is large. At the same time, it is also necessary to take into account pumping to measure parameters such as water yield and water level change. It takes several hours for the same water layer. For multi-layer pumping, the sampling work has problems such as long operation time, increased sampling volume, and high labor consumption. Summary of the Invention

[0004] The purpose of the present invention is to provide a layered pumping device for sediment buried deep geothermal reservoir experiments, which solves the problems of large difficulty in separating each water layer and sampling during multi-layer pumping, as well as long sampling operation time, increased sampling volume, and high labor consumption.

[0005] The present invention is achieved through the following technical solutions: A layered pumping device for sediment buried deep geothermal reservoir experiments, used for pumping water from aquifers at different depths in the same test well respectively, includes a casing, the casing is arranged in the test well and sequentially penetrates through several of the aquifers, and a water-stop expansion member is arranged at the part of the casing located between adjacent aquifers; A portion of the casing located in the same aquifer is provided with several groups of water inlet holes in an annular array. Inside the casing, several valve plates that reciprocally slide circumferentially along the inner wall of the casing and elastic members cooperating with the valve plates are arranged in an annular array. One valve plate corresponds to one group of the water inlet holes. A number of valve holes are provided on the valve plate. The valve holes are displaced from the water inlet holes by driving the valve plate to rotate through the elastic member, thereby preventing the water in the current aquifer from entering the casing. It further includes a submersible pump and a centralizing pipe. One end of the centralizing pipe is hermetically sleeved with the submersible pump. Several driving strips are arranged in an annular array on the outer wall of the centralizing pipe. The lower ends of the driving strips are conical. When the centralizing pipe descends, the several driving strips respectively drive the several valve plates to compress the elastic members and at the same time align the valve holes with the water inlet holes.

[0006] Furthermore, a cover plate is hermetically arranged at the lower end of the centralizing pipe. A partition plate is arranged in the inner cavity of the centralizing pipe. A sampling cavity is arranged between the partition plate and the cover plate; a negative pressure cavity is formed between the partition plate and the submersible pump. It further includes a power pipe. The power pipe coaxially penetrates through the cover plate and the partition plate, and the power pipe is rotationally connected to the cover plate and the partition plate; an impeller is arranged in the inner cavity of the power pipe. A negative pressure sampling pipe parallel to the power pipe is arranged in the sampling cavity. The pipe orifice of the negative pressure sampling pipe is hermetically provided with a sealing cover. A main sampling hole is provided on the sealing cover. A sliding seat that slides radially along the sampling cavity is arranged on the sealing cover. When the sliding seat slides, it always covers the main sampling hole. A secondary sampling hole is provided on the sliding seat. A sampling pipe is communicated with the secondary sampling hole. The end of the sampling pipe far away from the sliding seat passes through the partition plate and is communicated with the negative pressure cavity. A return spring is arranged at one end of the sliding seat far away from the power pipe. The two ends of the return spring respectively abut against the sealing cover and the sliding seat. The main sampling hole and the secondary sampling hole are displaced by the return spring. A shaft pipe is rotationally arranged in the sampling cavity. The shaft pipe is coaxial with the power pipe and is in transmission connection therewith. A cam is sleeved on the shaft pipe. When the cam rotates, the sliding seat is moved by its convex part and the return spring is compressed, thereby communicating the main sampling hole with the secondary sampling hole.

[0007] Furthermore, a seat ring is rotationally arranged coaxially in the sampling cavity. The partition plate is rotationally connected to the sampling cavity. The partition plate is fixedly connected to the seat ring through several connecting plates. Several of the negative pressure sampling pipes are arranged in an annular array on the seat ring. The negative pressure sampling pipes slide radially along the seat ring. When the negative pressure sampling pipes slide to the side close to the central axis of the seat ring, the sliding seat is located on the moving path of the convex part on the cam.

[0008] Further, a drive shaft penetrates through the centralizing pipe. The drive shaft is arranged radially along the centralizing pipe. A driving bevel gear is arranged on the part of the drive shaft located in the sampling cavity. A driven bevel gear is coaxially arranged on the seat ring. The driving bevel gear meshes with the driven bevel gear. A drive gear is arranged at one end of the drive shaft away from the driving bevel gear after passing through one of the drive bars. A plurality of tooth rails are arranged at intervals on the inner wall of the casing. One tooth rail is arranged on the part of the casing located in the same aquifer. When the drive gear meshes with one of the tooth rails and passes through the current tooth rail as the centralizing pipe descends, the driven bevel gear drives the seat ring to rotate 360° / N (N = the number of negative pressure sampling pipes).

[0009] Further, it further includes a connecting rod, a sliding rod, a spiral spring and a push head. A sliding cavity is coaxially arranged inside the drive shaft. The sliding rod is slidably arranged in the sliding cavity. One end of the sliding rod close to the driving bevel gear is connected to the push head through the connecting rod. A lock cap is arranged at one end of the sliding cavity close to the driving bevel gear. The connecting rod slidably passes through the lock cap. The spiral spring is sleeved on the connecting rod. Two ends of the spiral spring respectively abut against the sliding rod and the lock cap. A limiting strip is arranged on the part of the casing below the tooth rail. A wedge surface is arranged at one end of the limiting strip close to the tooth rail. When the sliding rod slides through the wedge surface and abuts against the limiting strip, the push head pushes the negative pressure sampling pipe to one side of the central axis of the seat ring.

[0010] Further, a plurality of rotating rollers are annularly arranged on the seat ring. The rotating rollers are arranged parallel to the negative pressure sampling pipes. One negative pressure sampling pipe is arranged between adjacent rotating rollers. An annular belt is wound around the plurality of rotating rollers. The outer belt surface of the annular belt abuts against the plurality of negative pressure sampling pipes. When the push head pushes one negative pressure sampling pipe to move towards one end of the central axis of the seat ring, the negative pressure sampling pipe drives the annular belt in contact with it to concave inward, and the remaining negative pressure sampling pipes are driven by the annular belt to the outside of the seat ring, so that the sliding seats on the remaining negative pressure sampling pipes are separated from the moving path of the convex parts on the cam.

[0011] Further, a piston is slidably arranged in the negative pressure sampling pipe. A plurality of negative pressure springs are arranged at one end of the piston away from the sealing cover. Two ends of the negative pressure springs are respectively connected to the bottom of the negative pressure sampling pipe and the piston.

[0012] Furthermore, an upper mounting ring and a lower mounting ring are arranged at intervals in the part of the casing located in the same aquifer, a first slide rail is arranged at the bottom of the upper mounting ring, a second slide rail is arranged at the top of the lower mounting ring, and the upper and lower ends of the valve plate are slidably arranged on the first slide rail and the second slide rail respectively; The upper mounting ring and the lower mounting ring are both provided with a plurality of cutouts in an annular array, and the plurality of cutouts are respectively used for the plurality of driving bars to pass through; There are two valve plates between the adjacent fractures in the same horizontal plane, a plurality of elastic members are arranged between the two valve plates, and two ends of the elastic members act on the two valve plates respectively; The two valve plates located on both sides of the break are butted against 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 break; The rack is located below the lower mounting ring.

[0013] Furthermore, a plurality of limit grooves are arranged in an annular array on the inner wall of the casing, and the plurality of limit grooves correspond to the plurality of fractures one by one, and a limit slide bar is arranged at one end of the driving bar away from the centralizing tube, and the limit slide bar is slidably placed in the limit groove; The gear rail is located on a side wall of the limiting groove; The limiting strip is located at the bottom of the limiting groove.

[0014] Furthermore, the power tube is transmission-connected to the shaft tube via a planetary reducer.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. When the driving strip separates the two mutually abutting valve plates, the water in the current aquifer can enter the casing, and then enter the righting tube from the bottom of the righting tube and then be pumped to the ground by the submersible pump. After the pumping test of the current aquifer is completed, the righting tube and the submersible pump continue to dive into the next water layer. When the driving strip completely passes through the fracture of the lower mounting ring, that is, it is detached 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 strip on the righting tube enters the fracture of the next water layer and aligns the valve hole of the next water layer with the water inlet hole, 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.

[0016] 2. When water flows through the power tube and enters 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 the sampling efficiency and saving manpower.

[0017] 3. As the centralizing tube dives, the driving gear meshes 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). One negative pressure sampling tube is used for each aquifer. The negative pressure sampling tube is pushed to the inside of the seat ring and intermittent sampling is carried out in conjunction with the cam.

[0018] 4. When the slide rod slides through the wedge surface and abuts against the limit strip, the push head pushes the negative pressure sampling tube to one side of the center axis of the seat ring, thereby moving the slide seat on the negative pressure sampling tube to the rotation path of the raised part on the cam.

[0019] 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 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 slide seats on the remaining negative pressure sampling tubes to leave the moving path of the raised part on the cam, ensuring that when the slide bar is gradually pushed toward the inside of the casing by the wedge surface of the limit strip, the push head pushes the new negative pressure sampling tube that has just been driven by the gear to drive the seat ring to rotate and is replaced 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 of the seat ring by the annular belt, ensuring that one and only one slide seat on the negative pressure sampling tube abutted by the push head is located on the rotating path of the raised part on the cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic cross-sectional view of a layered pumping device for deep-buried heat storage testing provided by the present invention; Figure 2 for Figure 1 A magnified schematic diagram of the structure at B in the middle; Figure 3 for Figure 1Schematic diagram of the structure of the cross-section at F-F in [device name]; Figure 4 is Figure 1 Enlarged schematic diagram of the structure at A in [device name]; Figure 5 is Figure 4 Enlarged schematic diagram of the structure at C in [device name]; Figure 6 is Figure 4 Schematic diagram of the structure of the cross-section at D-D in [device name]; Figure 7 is Figure 4 Enlarged schematic diagram of the structure at E in [device name]; Icon: 1. Test well, 2. Aquifer, 3. Casing, 31. Water inlet hole, 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 part, 5. Valve plate, 51. Elastic part, 52. Valve hole, 53. V-shaped opening, 6. Submersible pump, 7. Centering pipe, 71. Driving strip, 711. Limit slide bar, 72. Cover plate, 73. Partition plate, 74. Sampling chamber, 75. Negative pressure chamber, 76. Power pipe, 761. Impeller, 762. Shaft pipe, 763. Cam, 77. Seat ring, 771. Connecting plate, 772. Driven bevel gear, 78. Driving shaft, 781. Driving bevel gear, 782. Driving gear, 783. Tooth rail, 784. Connecting rod, 785. Slide bar, 786. Helical spring, 787. Pushing head, 788. Slide cavity, 789. Lock nut, 790. Limit bar, 791. Roller, 792. Ring belt, 8. Negative pressure sampling pipe, 81. Sealing cover, 82. Main sampling hole, 83. Slide seat, 831. Sub-sampling hole, 84. Sampling pipe, 85. Return spring, 86. Piston, 87. Negative pressure spring, 9. Planetary reducer. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0024] Refer to Figures 1 to 7As shown in the figure, this embodiment provides a layered pumping device for a sediment deep geothermal reservoir test, which is used to pump water from aquifers 2 at different depths in the same test well 1 respectively. It includes a casing 3, which is arranged in the test well 1 and sequentially penetrates through several aquifers 2. A water-stop expansion member 4 is arranged at the part of the casing 3 located between adjacent aquifers 2. The water-stop expansion member 4 can be made of a rubber material that expands when it meets water. After expanding when it meets water, it seals the casing 3 and the well wall of the test well 1. As another implementation method, the water-stop expansion member 4 can also be an inflated airbag, and the gap between the casing 3 and the wall of the test well 1 is sealed by inflating the airbag, so as to separate different water layers and avoid inaccurate pumping tests caused by the mutual flow between adjacent or multiple water layers. After the drilling of the test well 1 is completed and the drill pipe and drill bit are withdrawn, the casing 3 is lowered. After the water-stop expansion member 4 is set in place, concrete can be poured between the casing 3 and the test well 1 to integrate the casing 3 and the test well 1 into one body.

[0025] As Figure 1 shown, several groups of water inlet holes 31 are arranged in a circumferential array on the part of the casing 3 located between adjacent water-stop expansion members 4. Each group of water inlet holes 31 includes several independent water inlet holes 31. Several valve plates 5 that slide back and forth circumferentially along the inner wall of the casing 3 and elastic members 51 that cooperate with the valve plates 5 are arranged in a circumferential array inside the casing 3. One valve plate 5 corresponds to one group of water inlet holes 31. Several valve holes 52 are arranged on the valve plate 5. The elastic member 51 is used to drive the valve plate 5 to rotate so that several valve holes 52 on the valve plate 5 are aligned or misaligned with several water inlet holes 31 in the corresponding group. When the water inlet holes 31 are misaligned, the water in the current aquifer 2 is prevented from entering the casing 3. A stepped groove can be arranged at one end of the water inlet hole 31 close to the valve plate 5 to install a rubber sealing ring, which can 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 casing 3. Of course, other designs can also be used to ensure the sealing performance, and there is no limitation here.

[0026] More specifically, as Figures 1 - 3As shown, in the part of the casing 3 located between adjacent water-stop expansion members 4, an upper mounting ring 32 and a lower mounting ring 33 are arranged at intervals. The position of the lower mounting ring 33 is usually 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 slidably arranged on the first slide rail 321 and the second slide rail 331 respectively; a number of break openings 34 are arranged in a circular array on both the upper mounting ring 32 and the lower mounting ring 33. There are two valve plates 5 between the upper mounting ring 32 and the lower mounting ring 33 adjacent to each other in the same horizontal plane. A number of elastic members 51 are arranged between these two valve plates 5. The two ends of the elastic member 51 act on these two valve plates 5 respectively; the ends of the two valve plates 5 located on both sides of the break opening 34 away from the elastic member 51 are in mutual contact. Here, the two valve plates 5 on both sides of the break opening 34 are each driven by a set of elastic members 51, so that they are in mutual contact at the break opening 34. The elastic member 51 can be a traditional spiral spring or a torsion spring, which is not limited here. Then, as long as an object is inserted between the two mutually contacting valve plates 5 from the break opening 34, the two valve plates 5 can then move to both sides, aligning the valve hole 52 with the water inlet hole 31 while compressing the elastic member 51. After the object passes through, the two valve plates 5 are in mutual contact again under the action of the elastic member 51, and at the same time, the valve hole 52 is separated from the water inlet hole 31, preventing the water in the current aquifer 2 from entering the casing 3.

[0027] More specifically, it also includes a submersible pump 6 and a centralizing pipe 7. The centralizing pipe 7 can be modified from a section of drill pipe to save material usage. One end of the centralizing pipe 7 is hermetically sleeved with the submersible pump 6, and the two can move synchronously. When lowering the submersible pump, it can be lowered with the cooperation of a steel cable and a winch, or it can be lowered with the drill pipe of the drilling. As another implementation method, as Figure 1 shown, when the aquifer 3 is relatively deep, the centralizing pipe 7 does not need to be hermetically sleeved with the submersible pump 6, as long as the submersible pump 6 is inside the centralizing pipe. Since the water in the water layer will gush up along the test well 1 under the action of the underground pressure, that is, the submersible pump 6 does not necessarily need to be lowered to the depth of the aquifer 3 to pump water. At this time, the centralizing pipe 7 can be lowered with the cooperation of traditional drill pipes.

[0028] A number of driving bars 71 are arranged in an annular array on the outer wall of the centralizing pipe 7. The lower ends of the driving bars 71 are tapered. When the centralizing pipe 7 descends, the driving bars 71 respectively drive a number of valve plates 5 to compress the elastic members 51, and at the same time align the valve holes 52 with the water inlet holes 31. Specifically, during implementation, the centralizing pipe 7 is mainly used to ensure the coaxiality of the submersible pump 6 and the casing 3. At the same time, a number of break openings 34 are respectively used for the driving bars 71 to pass through. And at the top between two valve plates 5 on both sides of the break opening 34, there is a V-shaped opening 53, that is, at the top between two valve plates 5 that are in contact with each other at the break opening 34, there is a V-shaped opening. The V-shaped opening 53 is used for the tapered part at the lower end of the driving bar 71 to insert. As the driving bar 71 continues to insert between the two valve plates 5, the two valve plates 5 are pushed to both sides. While compressing the elastic member 51, the valve hole 52 is aligned with the water inlet hole 31. When the driving bar 71 moves out of the break opening 34 on the lower mounting ring 33 to the next water layer, the two valve plates 5 at the break opening 34 of the current aquifer 2 are reset and in contact with each other under the action of the elastic member 51, and at the same time the valve hole 52 is misaligned with the water inlet hole 31. Furthermore, when the driving bar 71 separates the two mutually contacting valve plates 5, 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 descend into the next water layer. When the driving bar 71 completely passes through the break opening 34 of the lower mounting ring 33, that is, after separating from between the two valve plates 5, all the valve holes 52 of the current aquifer 2 are misaligned with the corresponding water inlet holes 31, and the water in the current aquifer 2 no longer enters the casing 3. Similarly, after the driving bar 71 on the centralizing pipe 7 enters the break opening 34 of the next water layer and aligns the valve holes 52 of the next water layer with the water inlet holes 31, the submersible pump 6 can conduct a pumping test on the water layer where it is located. By operating in this way, the pumping operation of all water layers can be realized, which is simple and convenient, and it is not easy to mix up adjacent water layers. It's just that when the submersible pump 6 enters the next water layer, the part of the water in the casing 3 at the current depth that contains the water of the previous water layer can be ignored or pumped out first, and this part of the water is not used as a test sample.

[0029] Such as Figure 1 And Figure 4As shown, a cover plate 72 is hermetically arranged at the lower end of the centralizing pipe 7. A partition plate 73 is arranged in the inner cavity of the centralizing pipe 7. A sampling cavity 74 is arranged 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. Further included is a power pipe 76 which coaxially penetrates through the cover plate 72 and the partition plate 73. The power pipe 76 is rotationally connected to the cover plate 72 and the partition plate 73. An impeller 761 is arranged in the inner cavity of the power pipe 76. Thus, 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 pipe 76. Under the action of the impeller 761, the power pipe 76 generates self-rotation. Here, the impeller 761 can be a spiral blade, a water turbine or a paddle, etc. When the water flow passes through the power pipe 76 and enters the negative pressure cavity 75, the water flow drives the impeller 761 to rotate and then drives the entire power pipe 76 to rotate.

[0030] More specifically, as Figures 4 - 7As shown, a negative pressure sampling tube 8 arranged in parallel with the power tube 76 is arranged in the sampling cavity 74, and a sealing cover 81 is provided at the tube mouth of the negative pressure sampling tube 8. The sealing cover 81 is provided with a main sampling hole 82, and the sealing cover 81 is provided with a slide seat 83 which slides radially along the sampling cavity 74. When the slide seat 83 slides, it always covers the main sampling hole 82. A secondary sampling hole 831 is penetrated through the slide seat 83, and a sampling tube 84 is connected to the secondary sampling hole 831. The end of the sampling tube 84 away from the slide seat 83 passes through the partition plate 73 and is connected to the negative pressure cavity 75. In specific implementation, the sampling tube 84 adopts a The pipeline with a certain elasticity can satisfy the sliding along one end thereof with the slide seat 83. The sealing cover 81 is provided with a track for limiting and guiding the slide seat 83. The end of the slide seat 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 seat 83. The top of the sealing cover 81 is provided with a raised support point for providing a force for supporting the return spring 85, and then the other end of the spring acts on the slide seat 83, and the main sampling hole 82 and the auxiliary sampling hole 831 are misaligned through the return spring 85; the sampling cavity 74 is rotatably provided with a shaft tube 762, and the shaft tube 762 and the power tube 76 are 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 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 seat 83 moves through its convex part 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, so that 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, improving the sampling efficiency and saving manpower.

[0031] like Figures 4 - 7 As shown, a seat ring 77 is coaxially rotatably arranged 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 the two can rotate synchronously.

[0032] like Figures 4 - 7As shown in the figure, a number of negative pressure sampling tubes 8 are arranged in a circular array on the stay ring 77. The negative pressure sampling tubes 8 slide radially along the stay ring 77. When the negative pressure sampling tube 8 slides to the side close to the axis of the stay ring 77, the sliding seat 83 is located on the moving path of the convex part of the cam 763. A number of negative pressure sampling tubes 8 are respectively used for sampling operations in non-water layers. In the initial state, each negative pressure sampling tube 8 is located outside the stay ring 77. When a certain negative pressure sampling tube 8 is needed, only need to push the negative pressure sampling tube 8 towards the inner side of the stay ring 77 until the sliding seat 83 is located on the rotation path of the convex part of the cam 763. The convex part of the cam 763 can drive the sliding seat 83 to reset intermittently during rotation, so that the main sampling hole and the secondary sampling hole are intermittently conducted.

[0033] More specifically, a number of limiting grooves 35 are arranged in a circular array on the inner wall of the sleeve 3. A number of limiting grooves 35 respectively correspond to and communicate with a number of break ports 34 one by one. A limiting slide bar 711 is arranged at one end of the driving bar 71 away from the centralizing pipe 7. The limiting slide bar 711 slides in the limiting groove 35; the cooperation between the limiting slide bar 711 and the limiting groove 35 is used to prevent the centralizing pipe 7 from deflecting, thereby ensuring that the submersible pump 6 is coaxial with the sleeve 3. At the same time, it also ensures that the driving bar 71 will not deflect in the sleeve 3. The width of the driving bar 71 is greater than the width of the limiting groove 35. Therefore, the driving bar 71 is slidably connected to the inner wall of the sleeve 3 where the limiting groove 35 is located, while the limiting slide bar 711 only extends into the limiting groove 35 and does not contact the bottom of the limiting groove 35.

[0034] More specifically, a driving shaft 78 is arranged through the centralizing pipe 7. The driving shaft 78 is arranged radially along the centralizing pipe 7. A driving bevel gear 781 is arranged on the part of the driving shaft 78 located in the sampling cavity 74. A driven bevel gear 772 is coaxially arranged on the stay ring 77. The driving bevel gear 781 meshes with the driven bevel gear 772; a driving gear 782 is arranged at one end of the driving shaft 78 away from the driving bevel gear 781 after passing through a driving bar 71. A number of tooth rails 783 are arranged at intervals on the inner wall of the sleeve 3. One tooth rail 783 is arranged on the part of the sleeve 3 located in the same aquifer 2. The tooth rail 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 tooth rail 783 is arranged on one side wall of the limiting groove 35; the rack is closer to the bottom of the limiting chute and will not interfere with the limiting slide bar 711. When the driving gear 782 meshes with the tooth rail 783 of the current aquifer 2 and passes through the current tooth rail 783 as the centralizing pipe 7 descends, 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 stay ring 77 to rotate 360° / N (N = the number of negative pressure sampling tubes 8). One negative pressure sampling tube 8 is used for each aquifer 2. Push the negative pressure sampling tube 8 to the inner side of the stay ring 77 and cooperate with the cam 763 for intermittent sampling.

[0035] As Figures 4 - 7As shown, it also includes a connecting rod 784, a sliding rod 785, a spiral spring 786 and a push head 787. A sliding cavity 788 is coaxially arranged in the driving shaft 78, and the sliding rod 785 is slidably arranged in the sliding cavity 788. A rubber sealing ring is sleeved on the sliding rod 785, which can prevent water from entering the sleeve 3 from the inner cavity of the driving shaft 78; at the same time, 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, and 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, and the spiral spring 786 is sleeved on the connecting rod 784, and the two ends of the spiral spring 786 are respectively abutted against the sliding rod 785 and the locking cap 789, and the elastic force of the spiral spring 786 makes the sliding rod 785 on one side of the principle negative pressure sampling tube 8 when it is not subjected to external force, so that the end of the sliding rod 785 slides and abuts against the bottom of the limiting groove 35; A limit strip 790 is provided at the portion of the sleeve 3 below the rack 783. The limit strip 790 is located at the bottom of the limit groove 35 and is integrally formed therewith, except that a wedge surface is provided at one end of the limit strip 790 close to the rack 783. When the slide rod 785 slides through the wedge surface and abuts against the limit strip 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 seat 83 on the negative pressure sampling tube 8 to the rotation path of the raised portion on the cam 763.

[0036] More specifically, Figures 4 - 6 As shown, a plurality of rollers 791 are arranged in an annular array on the seat ring 77, and 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 belt 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 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, and the remaining negative pressure sampling tubes 8 are driven toward the outside of the seat ring 77 by the ring belt 792, thereby making the slide seats 83 on the remaining negative pressure sampling tubes 8 The moving path of the convex part on the cam 763 is separated from that of the convex part, ensuring that when the slide bar 785 is gradually pushed toward the inside of the sleeve 3 by the wedge surface of the limit strip 790, the push head 787 pushes the new negative pressure sampling tube 8 that has been replaced by the rotation of the seat ring 77 driven by the driving gear 782 to move toward the inside of the seat ring 77, 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 the slide seat 83 on one and only one negative pressure sampling tube 8 that is pressed by the push head 787 is located on the rotation path of the convex part on the cam 763.

[0037] When implementing it, Figure 4 and Figure 7As shown, a piston 86 is slidably arranged in the negative pressure sampling tube 8, and a plurality of negative pressure springs 87 are arranged 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 of the negative pressure sampling tube 8 by the negative pressure spring 87, so that negative pressure is generated between the piston 86 and the sealing cover 81, and 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 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, the structure is reliable and the cost is low.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stratified pumping device for deep-buried heat storage test, used for pumping water from aquifers (2) at different depths in the same test well (1), characterized in that: It comprises a casing (3), the casing (3) being arranged in the test well (1) and sequentially penetrating a plurality of the aquifers (2), the casing (3) being provided with a water-stop expansion member (4) at a position adjacent to the aquifers (2); The sleeve (3) is provided with a plurality of groups of water inlet holes (31) in a partial annular array located in the same aquifer (2); the inner annular array of the sleeve (3) is provided with a plurality of valve plates (5) that reciprocate 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 valve plate (5) is driven to rotate by the elastic member (51) 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) being sealed and sleeved with the submersible pump (6), a plurality of drive bars (71) being arranged in a ring array on the outer wall of the righting pipe (7), the lower ends of the drive bars (71) being tapered, and the plurality of valve plates (5) are respectively driven by the drive bars (71) to compress the elastic members (51) as the righting pipe (7) descends, thereby aligning the valve holes (52) with the water inlet holes (31).

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 disposed in the inner cavity of the power tube (76); A negative pressure sampling tube (8) arranged in parallel with the power tube (76) is arranged in the sampling cavity (74); a sealing cover (81) is provided at the tube mouth of the negative pressure sampling tube (8) to seal; a main sampling hole (82) is provided on the sealing cover (81); a sliding seat (83) sliding radially along the sampling cavity (74) is provided on the sealing cover (81); the sliding seat (83) always covers the main sampling hole (82) when sliding; a secondary sampling hole (831) is provided on the sliding seat (83); a sampling tube (84) is provided in communication with the secondary sampling hole (831); an end of the sampling tube (84) away from the sliding 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 seat (83) away from the power tube (76), and two ends of the return spring (85) are respectively in contact with the sealing cover (81) and the slide seat (83), so that the main sampling hole (82) and the auxiliary sampling hole (831) are misaligned 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, the shaft tube (762) being sleeved with a cam (763), and when the cam (763) rotates, the slide seat (83) is moved through its raised portion and the return spring (85) is compressed, thereby causing the main sampling hole (82) to communicate 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 arranged 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 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 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 heat storage test according to claim 3, characterized in that: A driving shaft (78) is provided on the centralizing tube (7), the driving shaft (78) being arranged radially along the centralizing tube (7), a driving bevel gear (781) being arranged at a portion of the driving shaft (78) located in the sampling chamber (74), a driven bevel gear (772) being coaxially arranged on the seat ring (77), the driving bevel gear (781) being meshed with the driven bevel gear (772); The end of the drive shaft (78) away from the active bevel gear (781) is provided with a drive bar (71) and a drive 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 drive gear (782) meshes with a rack (783) and passes through the rack (783) as the straightening tube (7) descends, the driven bevel gear (772) drives the seat ring (77) to rotate 360° / N (N=the number of negative pressure sampling tubes (8)).

5. A stratified pumping device for deep buried 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); a sliding cavity (788) is coaxially arranged in the driving shaft (78); the sliding rod (785) is slidably arranged in the sliding cavity (788); one 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); a locking cap (789) is arranged at one end of the sliding cavity (788) close to the active bevel gear (781); the connecting rod (784) slides through the locking cap (789); the coil spring (786) is sleeved on the connecting rod (784); and two ends of the coil spring (786) are respectively in contact with the sliding rod (785) and the locking cap (789); A limit strip (790) is provided at a portion of the sleeve (3) below the rack (783), and a wedge surface is provided at one end of the limit strip (790) close to the rack (783). When the slide bar (785) slides through the wedge surface and abuts against the limit strip (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. A stratified pumping device for deep buried heat storage test according to claim 5, characterized in that: A plurality of rollers (791) are arranged in a circular 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 arranged between adjacent rollers (791); An annular belt (792) is wound around a plurality of the rotating rollers (791), and the outer belt surface of the annular belt (792) abuts against a plurality of the negative pressure sampling tubes (8). When the push head (787) pushes a negative pressure sampling tube (8) to move toward one end of the central axis of the seat ring (77), the negative pressure sampling tube (8) drives the annular 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 annular belt (792), thereby causing the slide seats (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 test according to any one of claims 2 to 6, characterized in that: A piston (86) is slidably disposed in the negative pressure sampling tube (8), and a plurality of negative pressure springs (87) are disposed at one end of the piston (86) away from the sealing cover (81), and 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).

8. The stratified water pumping device for deep buried heat storage test according to claim 6 is characterized in that: An upper mounting ring (32) and a lower mounting ring (33) are arranged at intervals in a portion of the casing (3) located in the same aquifer (2); a first slide rail (321) is arranged at the bottom of the upper mounting ring (32); a second slide rail (331) is arranged at the top of the lower mounting ring (33); and upper and lower ends of the valve plate (5) are slidably arranged on the first slide rail (321) and the second slide rail (331), respectively; The upper mounting ring (32) and the lower mounting ring (33) are both provided with a plurality of cutouts (34) in a circular array, and the plurality of cutouts (34) are respectively used for the plurality of drive bars (71) to pass through; There are two valve plates (5) between the adjacent fractures (34) in the same horizontal plane, a plurality of elastic members (51) are arranged between the two valve plates (5), and two ends of the elastic members (51) act on the two valve plates (5) respectively; The two valve plates (5) located on both sides of the break (34) are in contact with 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 break (34); The toothed track (783) is located below the lower mounting ring (33).

9. A stratified pumping device for deep buried heat storage test according to claim 8, characterized in that: A plurality of limiting grooves (35) are arranged in an annular array on the inner wall of the sleeve (3), the plurality of limiting grooves (35) respectively corresponding to the plurality of fractures (34) one by one, a limiting slide bar (711) is arranged at one end of the driving bar (71) away from the centralizing tube (7), and the limiting slide bar (711) is slidably placed in the limiting groove (35); The gear rail (783) is located on a side wall of the limiting groove (35); The limiting strip (790) is located at the bottom of the limiting groove (35).

10. A stratified pumping device for deep buried 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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