Rock core seepage test device and test method

Abstract

The invention relates to the technical field of rock core seepage testing, and provides a rock core seepage testing device and method.The device comprises a testing mechanism, the testing mechanism comprises a vertically-arranged transparent shell, the transparent shell is cylindrical, and the two ends of the transparent shell are sealed through end plates respectively; the two end plates are respectively provided with a plurality of liquid conveying joints for introducing test liquid into the transparent shell in a penetrating manner, a pressure-bearing rod is arranged on the upper end plate in a sliding and penetrating manner, a hydraulic machine for pushing the pressure-bearing rod downwards is arranged above the pressure-bearing rod, and a supporting column is fixedly arranged on the lower end plate in a penetrating manner; the pressure bearing rod and the supporting column are each fixedly connected with a rock core tray used for clamping a rock core sample, and the supporting column is further provided with a first air channel and a second air channel which are communicated with inner cavities of the rock core trays. According to the invention, the general flow direction of the gas in the fracture of the rock core sample can be obtained in the rock core seepage test process.

Description

Technical Field

[0001] The invention relates to the technical field of core seepage test, in particular to a core seepage test device and a test method. Background Art

[0002] In the research of geological engineering, geotechnical engineering and environmental science, it is crucial to accurately evaluate the seepage performance of materials such as soil and rock. Core seepage test is an important means to evaluate the deformation and seepage performance of rocks under the action of fluid.

[0003] In the existing technology, core seepage tests are mostly carried out by applying some load to the core sample to force cracks to appear inside the core sample, and then the cracks spread to the surface of the core sample to form cracks, and then the cracks and cracks are detected by X-ray scanning technology to analyze the changes in the core sample. Although this type of technology can test the changes in the core, it can only obtain the distribution of cracks, and cannot obtain intuitive results for the flow of gas inside the cracks. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a core seepage test device and a test method, which can obtain the approximate flow direction of gas in the cracks of the core sample during the core seepage test, enrich the test results, and provide guidance for subsequent other tests and engineering practices.

[0005] In order to achieve the above-mentioned purpose, the specific scheme adopted by the present invention is: a core seepage test device, including a test mechanism, the test mechanism includes a vertically arranged transparent shell, the transparent shell is cylindrical, and the two ends of the transparent shell are respectively closed by an end plate, and the two end plates are respectively penetrated with a plurality of liquid delivery joints for introducing the test liquid into the interior of the transparent shell, a pressure-bearing rod is slidably penetrated on the upper end plate, a hydraulic press for pushing the pressure-bearing rod downward is arranged above the pressure-bearing rod, and a support column is fixedly penetrated on the lower end plate, the pressure-bearing rod and the support column are each fixedly connected with a core tray for clamping the core sample, and the support column is also provided with a first air channel and a second air channel interconnected with the inner cavity of the core tray, the first air channel is used to inject seepage gas into the core sample, and the second air channel is used to inject flow direction indicating gas into the core sample, and the flow direction indicating gas can form sediment in the core sample or can react with the test liquid to form sediment.

[0006] Preferably, the device includes a base, and the base includes a support plate and a bottom plate which are arranged up and down and parallel to each other. The support plate is provided with a through hole, and an end plate located below can pass through the through hole to allow the support column to fall on the bottom plate. The support plate and the bottom plate are connected by a plurality of vertical plates, and a distance is left between two adjacent vertical plates to form a channel. The first air channel is connected to a first gas source for providing the seepage gas through a first gas delivery pipe, and the second air channel is connected to a second gas source for providing the flow direction indicating gas through a second gas delivery pipe, and both the first gas delivery pipe and the second gas delivery pipe can pass through the channel.

[0007] Preferably, a ring-shaped track is fixedly provided on the upper surface of the support plate, and the track is coaxially arranged with the through hole, a support ring is rotatably provided on the track, and when the support column falls on the bottom plate, the support ring is located on the peripheral side of the transparent shell, and an image acquisition mechanism is fixedly provided on the support plate, and the image acquisition mechanism is used to photograph the transparent shell.

[0008] Preferably, the image acquisition mechanism comprises a mounting post vertically fixedly arranged on the support plate, and a camera and at least one fill light are arranged on a side of the mounting post facing the transparent shell.

[0009] Preferably, the lower surface of the support ring is coaxially fixedly connected with a rotating ring, the lower surface of the rotating ring is provided with an annular groove, the track is inserted into the annular groove, an outer gear ring is fixedly sleeved on the circumferential side wall of the support ring, a driving motor is fixedly installed on the support plate, and the driving motor is drivingly connected to a driving gear meshing with the outer gear ring.

[0010] Preferably, the second gas source includes a heating box, which is connected to an air inlet pipe, an air outlet pipe and a storage bin, in which iodine powder is stored, and at least one heating plate is provided inside the heating box. After the iodine powder enters the heating box, it can be heated by the heating plate to form iodine vapor and enter the second airway from the air outlet pipe and the second gas delivery pipe, and an air outlet valve is provided at the end of the air outlet pipe.

[0011] Preferably, a linear drive is disposed outside the heating box, an output end of the linear drive extends into the heating box and is fixedly connected to a piston, and the linear drive is used to drive the piston to move to transport the iodine vapor into the outlet pipe.

[0012] Preferably, at least one heating element is embedded in the support column, and the heating element is located on the side of the second air duct.

[0013] Preferably, at least two first partitions are fixedly arranged in the transparent shell, the first partition is fixedly connected to the second partition, the first partition and the second partition cooperate with each other to separate the interior of the transparent shell into at least two test chambers, and each of the test chambers is connected to at least one of the liquid delivery connectors.

[0014] A core seepage test method, based on the above core seepage test device, comprises the following steps: Placing the core sample into the transparent housing, and inserting two ends of the core sample into the two core trays respectively; Using the hydraulic press to drive the pressure rod downward, so that the pressure rod squeezes the core sample and applies an axial load to the core sample; Using the liquid delivery joint to input the test liquid into the transparent housing, and using the test liquid to apply circumferential confining pressure to the core sample; Using the first gas channel to input seepage gas into the core sample; After cracks appear in the core sample, flow direction indicating gas is input into the core sample by using the second gas channel.

[0015] The present invention can obtain the approximate flow direction of gas in the cracks of the core sample during the core seepage test, enriching the test results and providing guidance for subsequent other tests and engineering practices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the test device of the present invention; Figure 2 is a schematic diagram of the structure of the support ring; Figure 3 It is a schematic diagram of the structure of the test organization; Figure 4 is a schematic diagram of the arrangement of the first partition and the second partition; Figure 5 is a schematic diagram of the structure of the second gas source; Figure 6 It is a schematic diagram of the state after cracks are formed on the surface of the core sample.

[0018] Figure markings: 1-bottom plate, 2-vertical plate, 3-support plate, 4-channel, 5-through hole, 6-track, 7-driving gear, 8-support ring, 9-mounting column, 10-test mechanism, 11-outer gear ring, 12-rotating ring, 13-annular groove, 14-camera, 15-fill light, 16-end plate, 17-transparent shell, 18-liquid delivery connector, 19-support column, 20-first air channel, 21-heating element, 22-second air channel, 23-core tray, 24-core sample, 25-pressure rod, 26-first partition, 27-second partition, 28-heating box, 29-piston, 30-linear drive, 31-heating plate, 32-inlet pipe, 33-outlet pipe, 34-outlet valve, 35-storage bin. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 and Figure 3 As shown, the core seepage test device includes a test mechanism 10, which includes a vertically arranged transparent shell 17, the transparent shell 17 is cylindrical, and the two ends of the transparent shell 17 are respectively closed by an end plate 16, and the two end plates 16 are respectively penetrated with a plurality of liquid delivery joints 18 for passing the test liquid into the transparent shell 17, and a pressure rod 25 is slidably penetrated on the upper end plate 16, and a hydraulic press for pushing the pressure rod 25 downward is arranged above the pressure rod 25, and the end plate 16 located at the lower end plate 16 is provided with a pressure rod 25, and the pressure rod 25 is provided with a hydraulic press for pushing the pressure rod 25 downward. A support column 19 is fixedly penetrated on the top, and a core tray 23 for clamping the core sample 24 is fixedly connected to the pressure-bearing rod 25 and the support column 19 respectively. A first air channel 20 and a second air channel 22 which are interconnected with the inner cavity of the core tray 23 are also opened on the support column 19. The first air channel 20 is used to inject seepage gas into the core sample 24, and the second air channel 22 is used to inject flow direction indicating gas into the core sample 24. The flow direction indicating gas can form sediment in the core sample 24 or can react with the test liquid to form a precipitate.

[0021] When conducting a core seepage test, first, a cylindrical core sample 24 is placed in the transparent housing 17, and the two ends of the core sample 24 are placed in two core trays 23 respectively; then, a hydraulic press is used to push the pressure rod 25 downward, so that the pressure rod 25 moves downward and squeezes the core sample 24, thereby applying an axial load to the core sample 24, and a test liquid is input into the transparent housing 17 using a liquid delivery joint 18. The test liquid is distributed around the core sample 24, and a circumferential confining pressure is applied to the core sample 24. ; Then, the seepage gas is injected into the core sample 24 by the first gas channel 20. Under the multiple effects of the axial load, the axial confining pressure and the seepage gas, the core sample 24 is damaged and cracks are formed inside. When the cracks spread to the surface of the core sample 24, cracks are formed on the surface of the core sample 24. After that, after the cracks and cracks are stable, the core sample 24 is scanned by the ray scanning technology to obtain the three-dimensional data of the sample, and the fracture data is generated based on the three-dimensional data of the sample. The fracture data mainly includes the three-dimensional distribution area of ​​the fracture domain and crack width; finally, the flow direction indicating gas is introduced into the core sample 24 by the second gas channel 22. If the flow direction indicating gas adopts the scheme of forming precipitates in the cracks of the core sample 24, then after the flow direction indicating gas is introduced for a certain period of time, the core sample 24 is scanned again by the ray scanning technology. Because sediments are formed in the cracks, the obtained three-dimensional data of the sample will change, and the crack data will also change, mainly the crack width. Based on the position where the crack width changes in the three-dimensional distribution area of ​​the crack, the approximate flow direction of the flow direction indicating gas in the crack can be judged. The flow direction of the flow direction indicating gas is the flow direction of the gas in the crack after the cracks are generated in the core, so as to obtain more abundant test data and guide engineering practice; if the flow direction indicating gas adopts the scheme of reacting with the test liquid to form precipitates, a large amount of precipitates will be formed near the cracks. Based on the position where the precipitates appear, the approximate flow direction of the flow direction indicating gas in the cracks can be determined. The state of the surface of the core sample 24 after the cracks are formed and the morphological lines of the cracks are shown in the figure. Figure 6 It should be noted that the flow direction indicator is a rough data of the flow direction of the gas, which can be used to qualitatively analyze the flow of the gas in the core fracture, but cannot obtain very accurate direction data.

[0022] The present invention can obtain the approximate flow direction of gas in the cracks of the core sample 24 during the core seepage test, enriching the test results and providing guidance for subsequent other tests and engineering practices.

[0023] Further, such as Figure 1As shown, the device includes a base, and the base includes a support plate 3 and a bottom plate 1 which are arranged up and down and parallel to each other. A through hole 5 is opened on the support plate 3, and an end plate 16 located below can pass through the through hole 5 to allow the support column 19 to fall on the bottom plate 1. The support plate 3 and the bottom plate 1 are connected by a plurality of vertical plates 2, and a distance is left between two adjacent vertical plates 2 to form a channel 4. The first gas channel 20 is connected to a first gas source for providing seepage gas through a first gas delivery pipe, and the second gas channel 22 is connected to a second gas source for providing flow direction indicating gas through a second gas delivery pipe. Both the first gas delivery pipe and the second gas delivery pipe can pass through the channel 4. During the test, the bottom plate 1 is directly placed on the ground, because a large axial load is required to make the core sample 24 crack smoothly. Therefore, by placing the test mechanism directly on the bottom plate 1 and supporting the test mechanism by the ground and the bottom plate 1, the support strength can be guaranteed, thereby ensuring that the core sample 24 can crack smoothly. By leaving the channel 4 , it is convenient to deploy the first gas delivery pipe and the second gas delivery pipe, thereby facilitating the injection of seepage gas and flow direction indicating gas into the core sample 24 .

[0024] In order to facilitate the determination of whether cracks appear on the surface of the core sample 24, whether the shape of the cracks is stable, and whether sediment appears near the cracks, a circular track 6 is fixedly provided on the upper surface of the support plate 3, and the track 6 is coaxially arranged with the through hole 5. A support ring 8 is rotatably provided on the track 6. When the support column 19 falls on the bottom plate 1, the support ring 8 is located on the peripheral side of the transparent shell 17. An image acquisition mechanism is fixedly provided on the support plate 3, and the image acquisition mechanism is used to photograph the transparent shell 17. After the axial load, circumferential confining pressure and the infiltration gas are applied, the image acquisition mechanism is driven to rotate around the test mechanism and continuously photograph the test mechanism. Based on the transparent shell 17, the image captured includes the surface of the core sample 24. Further, based on the existing image recognition technology, especially the crack detection technology, it is possible to detect whether cracks appear on the surface of the core sample 24 from the captured image. After it is determined that cracks appear on the surface of the core sample 24, and the shape and size of the cracks do not change significantly after a preset time threshold, it can be determined that the cracks in the core sample 24 and the crack shape on the surface are relatively stable, and the flow direction indicating gas can be introduced into the core sample 24. If the flow direction indicating gas adopts a scheme of reacting with the test liquid to generate a precipitate, the generation of the precipitate will cause a part of the position of the crack to become blurred in the captured image. Based on this blurred position, it can be determined at which positions of the cracks the flow direction indicating gas has leaked, and then the approximate flow direction of the flow direction indicating gas in the cracks inside the core sample 24 can be determined. The track 6 is used to enable the image acquisition mechanism to rotate stably on the support ring 8, to ensure that the distance between the image acquisition mechanism and the test mechanism remains stable during the rotation process, and then to ensure that the same method can be used for all images for processing, and finally to ensure that the crack recognition result is sufficiently accurate.

[0025] The specific structure of the image acquisition mechanism is as follows: the image acquisition mechanism includes a mounting column 9 vertically fixed on the support plate 3, and a camera 14 and at least one fill light 15 are arranged on the side of the mounting column 9 facing the transparent housing 17. It should also be noted that the above-mentioned image recognition technology and crack detection technology are both mature existing technologies and will not be described in detail here.

[0026] like Figure 2As shown, the specific setting mode of the support ring 8 is as follows: the lower surface of the support ring 8 is coaxially fixedly connected with a rotating ring 12, the lower surface of the rotating ring 12 is provided with an annular groove 13, the track 6 is inserted into the annular groove 13, the peripheral side wall of the support ring 8 is fixedly sleeved with an outer gear ring 11, and a driving motor is fixedly provided on the support plate 3, and the driving motor is driven and connected with a driving gear 7 meshing with the outer gear ring 11. Through the cooperation of the annular groove 13 and the track 6, it is ensured that the support ring 8 can rotate stably, and through the cooperation of the driving motor, the driving gear 7 and the outer gear ring 11, the driving motor can drive the support ring 8 to rotate automatically, avoiding the error introduced by the manual rotation of the image acquisition mechanism. The driving motor can be a stepping motor, which drives the image acquisition mechanism to rotate the same angle each time, making it easier to determine the corresponding relationship between the captured image and the surface position of the core sample 24, and thus easier to detect whether there are cracks on the surface of the core sample 24.

[0027] Because most of the cracks on the surface of the core sample 24 do not surround the entire core sample 24, most of the cracks on the surface of the core sample 24 will only appear in a part of the area. In order to be able to more specifically detect the flow direction of the flow direction indicating gas, especially when the flow direction indicating gas reacts with the test liquid to form a precipitate, in order to more efficiently detect whether there is a precipitate near the crack, such as Figure 4 As shown, at least two first partitions 26 are fixedly arranged in the transparent shell 17, and the first partition 26 is fixedly connected to the second partition 27. The first partition 26 and the second partition 27 cooperate with each other to separate the interior of the transparent shell 17 into at least two test chambers, and each test chamber is connected to at least one liquid delivery joint 18. More specifically, the first partition 26 contacts the inner wall of the transparent shell 17, the end plate 16 and the outer wall of the core tray 23, and the second partition 27 contacts the core sample 24. The inner chamber of the transparent shell 17 can be divided into a plurality of test chambers by the first partition 26 and the second partition 27. Further, after the position of the crack is determined based on the image captured by the image acquisition mechanism, the corresponding relationship between the crack and the test chamber is determined, that is, in which test chambers the crack is located, and these test chambers can be called target chambers. When the core sample 24 is subsequently photographed by the image acquisition mechanism, only the target chamber needs to be photographed, thereby reducing the number of images captured, thereby reducing the complexity of image data processing, shortening the time consumption of image processing, and improving the overall efficiency of the test.

[0028] As described above, there are two schemes for the flow direction indicating gas. The first scheme is to form a sediment in the crack, and the second scheme is to react with the test liquid to form a precipitate. Both schemes require some special structures to be implemented, which are described in detail below.

[0029] When the flow direction indicating gas adopts the scheme of reacting with the test liquid to generate a precipitate, the test liquid includes two types, the first type is used in the process of fissure and crack formation, the first type can be water, and the seepage gas is carbon dioxide. After the fissure and crack are formed, the test liquid is replaced with the second type, the second type uses a calcium hydroxide solution, and the flow direction indicating gas uses carbon dioxide. After the flow direction indicating gas leaks from the crack into the test liquid, it reacts with the test liquid to generate a calcium carbonate precipitate, and the precipitate is distributed near the crack, so that the image captured by the image acquisition mechanism appears blurred near the crack, thereby determining the approximate flow direction of the flow direction indicating gas. In this scheme, water and calcium hydroxide solution can be stored in liquid storage tanks respectively, and transported to the inside of the transparent shell 17 through a water pump, a liquid infusion tube and a liquid delivery joint 18. The liquid storage tank, the water pump and the liquid infusion tube are all mature existing technologies, which will not be repeated here, and are not shown in the drawings. In addition, the first gas source can adopt a conventional gas source structure, for example, including a compressed storage tank capable of storing seepage gas, a pump for transporting the seepage gas in the compressed storage tank to the outside to the gas transmission pipeline, and a pressure sensor for monitoring the remaining seepage gas in the compressed storage tank. Each component is a mature existing technology and will not be described in detail here.

[0030] When the flow direction indicating gas adopts the scheme of forming a deposit in the crack, the flow direction indicating gas in the present invention adopts iodine vapor. On this basis, in order to stably provide iodine vapor, such as Figure 5As shown, the second gas source includes a heating box 28, the heating box 28 is connected with an air inlet pipe 32, an air outlet pipe 33 and a storage bin 35, iodine powder is stored in the storage bin 35, and at least one heating plate 31 is arranged inside the heating box 28. After the iodine powder enters the heating box 28, it can be heated by the heating plate 31 to form iodine vapor, and enter the second air channel 22 from the air outlet pipe 33 and the second gas delivery pipe, and the end of the air outlet pipe 33 is provided with an air outlet valve 34. After the cracks and fissures are formed and stabilized, the test liquid is continuously input into the transparent shell 17, and the temperature of the test liquid is controlled so that the temperature of the test liquid is lower than the sublimation temperature of the iodine element, and the temperature of the core sample 24 is reduced by the test liquid. Afterwards, from the storage bin 35, the granular iodine powder is input into the heating box 28, and the air inlet pipe 32 is utilized to pass into the heating box 28 a part of the shielding gas that can not react with the iodine element, for example, inert gas can be adopted, to promote the pressure in the heating box 28, and the shielding gas can also directly act on the iodine powder added in the heating box 28, so that the iodine powder is evenly distributed in the heating box 28, thereby sublimating into iodine vapor faster. Subsequently, the heating plate 31 is utilized to heat the iodine element, so that the iodine powder is sublimated and forms iodine vapor, and afterwards iodine vapor enters the crack inside the core sample 24 with higher pressure through the air outlet pipe 33, the second gas delivery pipe and the second air channel 22, and after the iodine vapor is cooled, it can be condensed into solid again and form the sediment attached to the inner wall of the crack. After a certain amount of iodine vapor is passed, stop, and reuse the ray scanning technology to scan the core sample 24, according to the difference of the scanning results before and after twice, the distribution of sediment in the crack can be determined, and then the approximate flow direction of iodine vapor in the crack is obtained. In order to facilitate the output of iodine vapor through the outlet pipe 33, a linear drive 30 is provided outside the heating box 28, the output end of the linear drive 30 extends into the heating box 28 and is fixedly connected to a piston 29, and the linear drive 30 is used to drive the piston 29 to move and transport the iodine vapor to the outlet pipe 33. It should also be noted that scanning the core sample 24 using ray scanning technology is a conventional technology in the art and will not be repeated here.

[0031] Furthermore, in order to prevent iodine vapor from condensing in the second gas channel 22, at least one heating element 21 is embedded in the support column 19, and the heating element 21 is located on the side of the second gas channel 22. The heating element 21 can ensure that the temperature inside the second gas channel 22 is higher than the sublimation temperature of the iodine element, thereby preventing iodine vapor from condensing in the second gas channel 5, and further ensuring that the iodine vapor can smoothly enter the cracks inside the core sample 24.

[0032] The present invention further provides a core seepage test method. Based on the above core seepage test device, the method includes S1 to S5.

[0033] S1. Place the core sample 24 into the transparent housing 17 , and insert both ends of the core sample 24 into two core trays 23 , respectively.

[0034] S2. Use a hydraulic press to drive the pressure rod 25 downward, so that the pressure rod 25 squeezes the core sample 24 and applies an axial load to the core sample 24.

[0035] S3. Use the liquid delivery joint 18 to input the test liquid into the transparent housing 17, and use the test liquid to apply circumferential confining pressure to the core sample 24.

[0036] S4. Use the first gas channel 20 to input seepage gas into the core sample 24.

[0037] S5. After cracks appear in the core sample 24, flow direction indicating gas is input into the core sample 24 through the second gas channel 22. Specifically, after the cracks and fractures are stabilized, flow direction indicating gas is introduced. The specific introduction method refers to the above two flow direction indicating gas solutions, which will not be repeated here.

[0038] Finally, it should be noted that in the present invention, the core sample 24 can be selected according to actual needs, for example, ordinary rock or coal rock can be used, and the relevant test parameters belong to the mature existing technology in this field and will not be repeated here.

[0039] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A core seepage test device, characterized in that: The test mechanism (10) comprises a vertically arranged transparent shell (17), the transparent shell (17) being cylindrical, and the two ends of the transparent shell (17) are respectively closed by an end plate (16), and the two end plates (16) are respectively penetrated with a plurality of liquid delivery joints (18) for introducing the test liquid into the transparent shell (17), a pressure rod (25) is slidably penetrated on the upper end plate (16), a hydraulic press for pushing the pressure rod (25) downward is arranged above the pressure rod (25), and a support is fixedly penetrated on the lower end plate (16) The support column (19) is provided with a core tray (23) for clamping a core sample (24), and the support column (19) is provided with a first air channel (20) and a second air channel (22) which are interconnected with the inner cavity of the core tray (23). The first air channel (20) is used to inject seepage gas into the core sample (24), and the second air channel (22) is used to inject flow direction indicating gas into the core sample (24). The flow direction indicating gas can form a sediment in the core sample (24) or can react with the test liquid to form a precipitate.

2. The core seepage test device according to claim 1, characterized in that: The device comprises a base, the base comprising a support plate (3) and a bottom plate (1) which are arranged up and down and parallel to each other, the support plate (3) being provided with a through hole (5), an end plate (16) located at the bottom being able to pass through the through hole (5) so that the support column (19) falls on the bottom plate (1), the support plate (3) and the bottom plate (1) are connected via a plurality of vertical plates (2), a distance is left between two adjacent vertical plates (2) to form a channel (4), the first gas channel (20) is connected to a first gas source for providing the seepage gas via a first gas delivery pipe, the second gas channel (22) is connected to a second gas source for providing the flow direction indicating gas via a second gas delivery pipe, and both the first gas delivery pipe and the second gas delivery pipe are able to pass through the channel (4).

3. The core seepage test device according to claim 2, characterized in that: An annular track (6) is fixedly provided on the upper surface of the support plate (3), and the track (6) is coaxially arranged with the through hole (5). A support ring (8) is rotatably provided on the track (6), and when the support column (19) falls on the bottom plate (1), the support ring (8) is located on the peripheral side of the transparent shell (17). An image acquisition mechanism is fixedly provided on the support plate (3), and the image acquisition mechanism is used to photograph the transparent shell (17).

4. The core seepage test device according to claim 3, characterized in that: The image acquisition mechanism comprises a mounting column (9) vertically fixedly arranged on the support plate (3), and a camera (14) and at least one fill light (15) are arranged on a side of the mounting column (9) facing the transparent housing (17).

5. The core seepage test device according to claim 3, characterized in that: A rotating ring (12) is coaxially fixedly connected to the lower surface of the support ring (8); an annular groove (13) is provided on the lower surface of the rotating ring (12); the track (6) is inserted into the annular groove (13); an outer gear ring (11) is fixedly sleeved on the peripheral side wall of the support ring (8); a driving motor is fixedly arranged on the support plate (3); and the driving motor is drivingly connected to a driving gear (7) meshing with the outer gear ring (11).

6. The core seepage test device according to claim 2, characterized in that: The second gas source comprises a heating box (28), the heating box (28) being connected to an air inlet pipe (32), an air outlet pipe (33) and a storage bin (35), wherein iodine powder is stored in the storage bin (35), and at least one heating plate (31) is arranged inside the heating box (28). After the iodine powder enters the heating box (28), it can be heated by the heating plate (31) to form iodine vapor, and then enters the second gas channel (22) through the air outlet pipe (33) and the second gas delivery pipe, and an air outlet valve (34) is arranged at the end of the air outlet pipe (33).

7. The core seepage test device according to claim 6, characterized in that: A linear drive (30) is arranged outside the heating box (28), and an output end of the linear drive (30) extends into the heating box (28) and is fixedly connected to a piston (29). The linear drive (30) is used to drive the piston (29) to move and transport the iodine vapor to the outlet pipe (33).

8. The core seepage test device according to claim 6, characterized in that: At least one heating element (21) is embedded inside the support column (19), and the heating element (21) is located on the side of the second air channel (22).

9. The core seepage test device according to claim 1, characterized in that: At least two first partitions (26) are fixedly arranged in the transparent housing (17); the first partition (26) is fixedly connected to a second partition (27); the first partition (26) and the second partition (27) cooperate with each other to separate the interior of the transparent housing (17) into at least two test chambers; each of the test chambers is in communication with at least one of the liquid delivery connectors (18).

10. A core seepage test method, characterized in that: Based on the core seepage test device according to any one of claims 1 to 9, the method comprises the following steps: Placing the core sample (24) into the transparent housing (17), and inserting two ends of the core sample (24) into the two core trays (23) respectively; Using the hydraulic press to drive the pressure-bearing rod (25) downward, so that the pressure-bearing rod (25) squeezes the core sample (24) to apply an axial load to the core sample (24); Using the liquid delivery joint (18) to input a test liquid into the transparent housing (17), and using the test liquid to apply a circumferential confining pressure to the core sample (24); Using the first gas channel (20) to input seepage gas into the core sample (24); After cracks appear in the core sample (24), flow direction indicating gas is input into the core sample (24) via the second gas channel (22).

Images