A device for sampling radioactive samples of geothermal fluids

Abstract

The present invention relates to the technical field of underground collection devices, and specifically discloses a device for sampling radioactive samples of geothermal fluids, comprising a sampling tube and a water filling tube disposed below the sampling tube; the sampling tube is provided with an exhaust hole at the top and an air inlet at the middle; the sampling tube is provided with a notch and a water inlet channel at the bottom, the notch being provided with a water inlet pipe communicating with the water inlet channel, the outer edge of the water inlet pipe being provided with a first water inlet; the water inlet pipe passing through the upper section of the water filling tube and being rotatably connected thereto, and the upper section of the water filling tube being provided with an outer pipe sleeve adapted to the water inlet pipe, the outer pipe sleeve being provided with a second water inlet; when the water filling tube is stationary, the first water inlet and the second water inlet are offset and closed; when the water filling tube is flipped over, the first water inlet and the second water inlet are overlapped and connected. The present invention has better sampling function and self-closing properties, and higher sampling safety.

Description

Technical Field

[0001] The present invention relates to the technical field of underground sampling devices, and in particular to a sampling device for geothermal fluid radioactive samples. Background Art

[0002] Geothermal fluids are a general term for various thermal fluids stored underground at temperatures above normal, including groundwater, geothermal steam, and heat-carrying gases. These include geothermal steam, geothermal water, and hydrothermal fluids containing a variety of components and high concentrations. Common heat-carrying gases include carbon dioxide, hydrogen sulfide, hydrogen, oxygen, nitrogen, and methane. Geothermal fluids are often radioactive, so sampling requires special measures to ensure safety and accurate sample acquisition.

[0003] Sampling and testing of geothermal fluids plays an important role in their development. For example, in geothermal heating, geothermal water is directly circulated into indoor heating pipes, part of which is used in heat exchangers to extract heat energy, and the heating tail water is discharged into the sewer. The water quality of geothermal tail water is not much different from the original water quality, and the water temperature is relatively high (generally around 30°C). Therefore, using heating tail water as the water source for geothermal reinjection will not affect the water quality of the heat storage.

[0004] Some existing instruments for sampling geothermal fluid samples usually extend directly into the geothermal fluid to sample liquid, making it difficult to sample underground hot water and geothermal steam at the same time. In addition, they have poor self-closing properties and are prone to leakage, posing a certain threat to the safety of operators. Summary of the Invention

[0005] The object of the present invention is to provide a device for sampling radioactive samples of geothermal fluids, which has better sampling function and self-closing performance and higher sampling safety.

[0006] The present invention is achieved through the following technical solutions: a sampling device for geothermal fluid radioactive samples, comprising a sampling barrel and a water filling barrel arranged on the lower side of the sampling barrel; an exhaust hole is provided at the top of the sampling barrel, and an air inlet hole is provided at the middle section; a notch groove and a water inlet channel are provided at the bottom of the sampling barrel, a water inlet pipe communicating with the water inlet channel is provided in the notch groove, and a first water inlet is provided on the outer edge surface of the water inlet pipe; the water inlet pipe passes through the upper section of the water filling barrel and is rotatably connected thereto, and an outer pipe sleeve is provided on the upper section of the water filling barrel that is compatible with the water inlet pipe, and a second water inlet is provided on the outer pipe sleeve; when the water filling barrel is stationary, the first water inlet and the second water inlet are staggered and closed; when the water filling barrel is flipped over, the first water inlet and the second water inlet overlap and are connected.

[0007] Furthermore, the sampling tube is provided with a first floating plate and a second floating plate that fit with the inner hole, and a protrusion for supporting the first floating plate is provided above the air inlet; the second floating plate is provided at the bottom of the sampling tube.

[0008] Furthermore, it also includes a central axis, which is arranged in the sampling cylinder, and the two ends of the central axis are respectively connected to the top and bottom of the sampling cylinder, and the central axis passes through the middle of the first floating plate and the second floating plate and is slidably connected thereto.

[0009] Furthermore, a buoyancy skirt is provided on the outside of the sampling tube, and the buoyancy skirt is provided between the air inlet and the water filling tube.

[0010] Furthermore, a filter screen is provided at the open end of the water filling cylinder.

[0011] Furthermore, a cleaning strip is provided in the notch groove, and when the water filling cylinder turns around the water inlet pipe, the cleaning strip contacts the surface of the filter screen.

[0012] Furthermore, it also includes an elastic pull rope, and both ends of the elastic pull rope are respectively connected to the water filling cylinder and the notch groove.

[0013] Furthermore, a baffle is provided at the bottom of the water filling cylinder.

[0014] Furthermore, the air inlet is arranged downward.

[0015] Furthermore, a rotation angle adjuster and a lifting rod are provided on the top of the sampling tube, and the tail end of the lifting rod is connected to the rotation angle adjuster to drive the sampling tube to rotate.

[0016] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0017] 1. The air inlet and water filling cylinder are set to realize the simultaneous collection of hot steam, hot air and underground hot water, which has a self-sealing effect and high safety;

[0018] 2. Taking advantage of the uneven flow rate of geothermal fluid in the horizontal direction, the water filling barrel can rotate back and forth at a certain angle, and the cleaning scraper can realize the self-cleaning of the filter cover;

[0019] 3. The first floating plate and the second floating plate are used to separate the sampled hot steam and underground hot water. After the sampling is completed, the air inlet and the exhaust hole can be blocked respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the geothermal fluid radioactive sample sampling device before sampling begins;

[0021] Figure 2This is a schematic diagram of the structure of the geothermal fluid radioactive sample sampling device of the present invention after geothermal gas and liquid sampling is completed;

[0022] Figure 3 for Figure 2 A local enlarged view of point A in FIG;

[0023] Figure 4 is a cross-sectional view of the sampling tube of the present invention;

[0024] Figure 5 This is a schematic structural diagram of the water filling cylinder at the bottom of the sampling cylinder in the present invention before sampling;

[0025] Figure 6 This is a schematic diagram of the structure of the water filling tube of the present invention when it is inserted into the geothermal water flow and is impacted and turned over;

[0026] Figure 7 This is a structural diagram of the water filling barrel in the present invention when it is flipped to a horizontal position by the impact of a strong geothermal fluid.

[0027] Figure markings: 1-sampling cylinder, 11-air inlet, 12-exhaust hole, 13-notch, 131-cleaning scraper, 132-elastic pull rope, 14-water inlet channel, 15-buoyancy outer skirt, 2-water filling cylinder, 21-filter screen cover, 22-baffle, 3-water inlet pipe, 31-first water inlet, 4-outer pipe sleeve, 41-second water inlet, 5-first float plate, 6-second float plate, 7-protrusion, 8-central axis, 9-rotation angle adjuster, 10-lifting rod. DETAILED DESCRIPTION

[0028] The following is further described in conjunction with specific embodiments. Figure 1-Figure 7As shown, this embodiment is a device for sampling radioactive samples of geothermal fluids, comprising a sampling tube 1 and a water filling tube 2 provided on the lower side of the sampling tube 1; an exhaust hole 12 is provided on the top of the sampling tube 1, and an air inlet 11 is provided in the middle section; a notch groove 13 and a water inlet channel 14 are provided at the bottom of the sampling tube 1, a water inlet pipe 3 communicating with the water inlet channel 14 is provided in the notch groove 13, and a first water inlet port 31 is provided on the outer edge of the water inlet pipe 3; the water inlet pipe 3 passes through the upper section of the water filling tube 2 and is rotatably connected thereto, and the upper section of the water filling tube 2 is provided with a notch groove 13 and a water inlet channel 14; The section is provided with an outer pipe sleeve 4 that is compatible with the water inlet pipe 3, and the outer pipe sleeve 4 is provided with a second water inlet 41; when the water filling cylinder 2 is stationary, the first water inlet 31 and the second water inlet 41 are offset and closed; when the water filling cylinder 2 is turned over, the first water inlet 31 and the second water inlet 41 overlap and are connected; specifically, the flow of geothermal fluid underground is divided into vertical flow and horizontal flow. The heat of the deep magma system rises through the active fault zone, forming a heat source for the geothermal system. At the same time, the fault zone also constitutes a channel for fluid circulation. These fault zones and fissures provide a path for the horizontal flow of geothermal fluid. When the sampling device is lowered along the borehole, the lower half of the sampling tube 1 is inserted into the geothermal water, and the air inlet 11 is located above the geothermal water. The hot steam and hot gas heated by the magma float up to contact the air inlet 11 and are input into the sampling tube 1. The hot steam squeezes the air at the upper end of the air inlet 11 in the sampling tube 1 and discharges it from the exhaust hole 12. In addition, the direction of the notch 13 is consistent with the flow direction of the underground hot water. During the horizontal flow of hot water, the hydraulic force will drive the water filling tube 2 to go around the water inlet pipe 3. The water inlet 31 and the water inlet 41 are turned over to a horizontal state, so that the first water inlet 31 and the second water inlet 41, which were originally in a dislocated closed state, partially overlap. At this time, the open end of the water filling cylinder 2 facing the water flow direction will be filled with hot water. The underground hot water passes through the second water inlet 41 and the first water inlet 31 in turn, and is injected into the sampling cylinder 1 along the water inlet pipe 3 and the water inlet channel 14. The hot water gradually overflows from the bottom of the sampling cylinder 1, and the original air below the air inlet 11 can be discharged from the air inlet 11, thereby realizing the simultaneous automatic sampling and collection of liquid, gas and steam of the geothermal fluid.

[0029] It is worth noting that a one-way valve or other device may be provided at the exhaust hole 12 to prevent dust or dirt from clogging the exhaust hole 12 when the sampling device is taken out, and to prevent the exhaust hole 12 from re-flowing into impurity gases.

[0030] Furthermore, the flow of geothermal fluids is caused by uneven temperatures. Temperature changes cause changes in the density of geothermal fluids, thereby promoting their flow. In underground heat reservoirs, the temperature distribution is uneven. Areas closer to heat sources (such as magma intrusions) have higher temperatures, while areas farther from the heat source have lower temperatures. High-temperature geothermal fluids have relatively low densities, while low-temperature geothermal fluids have relatively high densities. According to the principle of buoyancy in physics, a fluid with a lower density will rise within a fluid with a higher density. For example, hot water heated by magma will float upward because its density is lower than that of the surrounding, cooler water. This buoyancy-driven flow is also an important way geothermal fluids flow underground.

[0031] like Figure 2 As shown, the sampling tube 1 in this embodiment is provided with a first floating plate 5 and a second floating plate 6 that fit in with the inner hole, and a protrusion 7 for supporting the first floating plate 5 is provided above the air inlet 11; the second floating plate 6 is provided at the bottom of the sampling tube 1; specifically, when hot steam and hot air are injected into the air inlet 11, it will drive the first floating plate 5 to rise from the protrusion 7 and squeeze the air above the first floating plate 5 to be discharged from the exhaust hole 12, and underground hot water enters the sampling tube 1 from the water inlet channel 14, and the water will drive the second floating plate 6 to rise to support the protrusion 7. 7 limit. During this process, since there are multiple air inlet holes 11, the second float plate 6 will discharge some residual air from the air inlet holes 11, without affecting the hot steam from the other air inlet holes 11 into the sampling tube 1. Therefore, when the second float plate 6 rises to the protrusion 7, the second float plate 6 just blocks the air inlet holes 11, and the sampling tube 1 forms a self-sealing structure. The hot steam and hot air are stored between the first float plate 5 and the second float plate 6, and the underground hot water is stored below the second float plate 6. The sampling tube 1 is not prone to the risk of sample leakage.

[0032] Reference Figure 1 As shown, in order to ensure that the first float plate 5 and the second float plate 6 can rise toward a horizontal state, this embodiment further includes a central axis 8, which is arranged in the sampling tube 1, and the two ends of the central axis 8 are respectively connected to the top and the bottom of the sampling tube 1, and the central axis 8 passes through the middle of the first float plate 5 and the second float plate 6 and is slidably connected therewith, so that they rise more smoothly, the first float plate 5 and the second float plate 6 are not easily stuck with the inner wall of the sampling tube 1, and the edge of the first float plate 5 can also better fit and block the exhaust hole 12, and the edge of the second float plate 6 can better fit and block the air inlet hole 11.

[0033] like Figure 1 and Figure 4 As shown, the outside of the sampling tube 1 in this embodiment is provided with a buoyancy skirt 15, and the buoyancy skirt 15 is arranged between the air inlet 11 and the water filling tube 2; specifically, the buoyancy skirt 15 increases the contact area with water, so that the sampling tube 1 floats on the water surface and is not easy to collapse, and also ensures that the water inlet is stably arranged above the water surface to collect hot steam and hot air.

[0034] like Figure 5 、 Figure 6 and Figure 7 As shown, underground hot water contains more impurities. In order to prevent them from entering the water cylinder 2 and causing blockage, which affects sampling, a filter screen 21 is provided at the open end of the water cylinder 2. The filter screen 21 is an arc-shaped structure, so that impurities can be washed away by the water flow and are not easily attached to the surface of the filter screen 21.

[0035] like Figure 5 and Figure 6 As shown, a cleaning strip 131 is provided in the notch groove 13 in this embodiment. When the water filling cylinder 2 turns around the water inlet pipe 3, the cleaning strip 131 contacts the surface of the filter screen cover 21. Specifically, the horizontal hydraulic force drives the vertical water filling cylinder 2 to turn. Since the underground water flow speed is not uniform, the water filling cylinder 2 rotates back and forth at a certain angle. The cleaning strip 131 can contact the surface of the filter screen cover 21 for cleaning, thereby reducing the chance of clogging of the filter screen cover 21.

[0036] like Figure 6 As shown, this embodiment further includes an elastic pull rope 132, the two ends of which are connected to the water cylinder 2 and the notch 13 respectively; specifically, when the water cylinder 2 is turning over, that is, when the water cylinder 2 tends to be horizontal from a vertical state, the elastic pull rope 132 will be stretched to accumulate momentum, so that when the hydraulic impact on the water cylinder 2 becomes smaller, the elastic pull rope 132 will pull the water cylinder 2 to rotate and reset to a certain angle. This process can be referred to Figure 7 Towards Figure 6 The change has the effect of improving the contact and cleaning effect between the cleaning strip 131 and the filter screen cover 21.

[0037] Figure 7 When the water flow rate is fast, the water filling tube 2 is turned to a horizontal state. After the underground hot water enters the water filling tube 2, the high-pressure and high-speed water can flow into the second water inlet 41, the first water inlet 31 and the water inlet channel 14.

[0038] Better yet, a baffle 22 is provided at the bottom of the water filling tube 2 to increase the turning force-bearing area.

[0039] like Figure 2 As shown, since the hot steam is in a floating state, in order to facilitate collection, the air inlet 11 is set downward, and the air inlet 11 guides the hot steam into the sampling tube 1.

[0040] like Figure 1As shown, a rotation angle adjuster 9 and a lifting rod 10 are provided at the top of the sampling tube 1, and the tail end of the lifting rod 10 is connected to the rotation angle adjuster 9 to drive the sampling tube 1 to rotate. Specifically, the sampling tube 1 can be driven to rotate a certain angle by rotating the lifting rod 10, so that the water filling tube 2 is aligned with the flow direction of underground hot water. The rotation angle adjuster 9 can also be used to drive the sampling tube 1 to rotate and adjust the angle without moving the lifting rod 10. The rotation angle adjuster 9 includes a ring gear, a gear and a motor. The ring gear is installed on the top of the sampling tube 1, and the gear is driven by the motor, and the gear is meshed with the ring gear to achieve this.

[0041] 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 device for sampling radioactive samples of geothermal fluids, characterized by: It comprises a sampling cylinder (1) and a water filling cylinder (2) arranged on the lower side of the sampling cylinder (1); The top of the sampling tube (1) is provided with an exhaust hole (12), and the middle section is provided with an air inlet hole (11); The bottom of the sampling tube (1) is provided with a notch groove (13) and a water inlet channel (14); a water inlet pipe (3) communicating with the water inlet channel (14) is provided in the notch groove (13); and a first water inlet (31) is provided on the outer edge surface of the water inlet pipe (3); The water inlet pipe (3) passes through the upper section of the water filling cylinder (2) and is rotatably connected thereto, and the upper section of the water filling cylinder (2) is provided with an outer pipe sleeve (4) adapted to the water inlet pipe (3), and the outer pipe sleeve (4) is provided with a second water inlet (41); When the water filling cylinder (2) is at rest, the first water inlet (31) and the second water inlet (41) are staggered and closed; When the water filling tube (2) is turned over, the first water inlet (31) and the second water inlet (41) overlap and communicate with each other; The sampling tube (1) is provided with a first floating plate (5) and a second floating plate (6) adapted to fit the inner hole, and a protrusion (7) for supporting the first floating plate (5) is provided above the air inlet hole (11); The second floating plate (6) is arranged at the bottom of the sampling tube (1); The central shaft (8) is provided in the sampling cylinder (1), and the two ends of the central shaft (8) are respectively connected to the top and the bottom of the sampling cylinder (1), and the central shaft (8) passes through the middle of the first floating plate (5) and the second floating plate (6) and is slidably connected thereto.

2. The device for collecting radioactive samples from geothermal fluids according to claim 1, characterized in that: The sampling tube (1) is provided with a buoyancy outer skirt (15) on the outside, and the buoyancy outer skirt (15) is provided between the air inlet (11) and the water filling tube (2).

3. The device for collecting radioactive samples from geothermal fluids according to claim 1, characterized in that: The open end of the water filling cylinder (2) is provided with a filter screen cover (21).

4. The device for collecting radioactive samples from geothermal fluids according to claim 3, characterized in that: A cleaning strip (131) is provided in the notch groove (13). When the water filling tube (2) turns around the water inlet pipe (3), the cleaning strip (131) contacts the surface of the filter screen cover (21).

5. The device for collecting radioactive samples from geothermal fluids according to claim 4, characterized in that: It also includes an elastic pull rope (132), with both ends of the elastic pull rope (132) respectively connected to the watering cylinder (2) and the notch groove (13).

6. The device for collecting radioactive samples from geothermal fluids according to any one of claims 3 to 5, characterized in that: A baffle (22) is provided at the bottom of the water filling cylinder (2).

7. The device for collecting radioactive samples from geothermal fluids according to claim 1, characterized in that: The air inlet (11) is arranged downward.

8. The device for collecting radioactive samples from geothermal fluids according to claim 1, characterized in that: A rotation angle adjuster (9) and a lifting rod (10) are provided on the top of the sampling tube (1), and the tail end of the lifting rod (10) is connected to the rotation angle adjuster (9) to drive the sampling tube (1) to rotate.

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