An apparatus and method for measuring permeability of a rock

Abstract

The present application relates to the technical fields of permeability measurement, and discloses a kind of ore permeability measuring device and method, including measuring frame, the upper portion of measuring frame is fixedly connected with liquid injection pipe, and the top of liquid injection pipe is equipped with liquid injection part, further comprising: sealing element, sealing element is made of two groups of half-round plates, the lower portion of measuring frame is slidably connected with liquid discharge pipe, two groups of half-round plates are fixedly wrapped in the end of liquid injection pipe and liquid discharge pipe being close to each other, and clamping portion is installed on liquid discharge pipe, stirring portion, stirring portion is installed on liquid injection pipe;The present application is linked to reciprocating screw rod and magnetic coupling mechanism by driving motor, under the premise of not destroying high-pressure seal, simultaneously realizes liquid injection pipe inlet fluid stirring and test liquid uniform stirring in liquid storage tank, can prevent core inlet blockage, promote reactive fluid uniform distribution, can also avoid particle settlement and bubble retention, effectively improve the accuracy, repeatability and engineering representativeness of low-permeability ore permeability measurement, more real simulation field dynamic injection working condition.

Description

Technical Field

[0001] This invention relates to the field of permeability measurement technology, specifically to an ore permeability measurement device and method. Background Technology

[0002] In the fields of mineral resource development, in-situ leaching, and geological engineering, accurately measuring the permeability of ore cores is a key foundation for assessing fluid transport capacity, optimizing leaching processes, and predicting engineering safety.

[0003] However, existing permeability measurement devices generally suffer from the following shortcomings: First, during the testing process, particle settling, clay expansion, or accumulation of reaction products can easily cause blockage at the core inlet, especially affecting metallic ores containing fine minerals (such as copper and uranium ores); second, most devices employ static steady-state methods, which cannot simulate real dynamic conditions such as mine blasting, earthquakes, or injection disturbances, resulting in permeability measurements that fail to reflect the seepage characteristics of low-permeability, dense ores under actual stress-disturbance coupled environments; third, while traditional confining pressure systems can simulate formation stress, they lack synergistic integration with multiple physical fields such as fluid disturbance, degassing, and vibration, making it difficult to achieve high-fidelity multi-field coupled seepage experiments. Therefore, this paper proposes an ore permeability measurement device and method. Summary of the Invention

[0004] This invention provides an ore permeability measurement device and method. By driving a motor to link a reciprocating lead screw and a magnetic coupling mechanism, the fluid at the injection pipe inlet is agitated and the test liquid in the storage tank is uniformly stirred, preventing blockage at the core inlet and avoiding particle sedimentation and bubble retention. Furthermore, through the cooperation of a moving wedge block, a fixed wedge block, and a vibration spring, vibration simulation and self-driven degassing are achieved simultaneously, solving the problems mentioned in the background art, such as difficulty in simulating dynamic disturbances, easy blockage, lack of multi-field coupling, and inaccurate measurement accuracy.

[0005] This invention provides the following technical solution: A device for measuring the permeability of an ore includes a measuring frame, an injection pipe fixedly connected to the upper part of the measuring frame, and an injection section installed on the top of the injection pipe. It also includes: a sealing element composed of two sets of semi-circular plates; a drain pipe slidably connected to the lower part of the measuring frame; the two sets of semi-circular plates fixedly wrapping around the ends of the injection pipe and the drain pipe that are close to each other; a clamping part installed on the drain pipe; a stirring part installed on the injection pipe for stirring and mixing the liquid passing through the ore sample; and a vibrating part installed on the injection pipe for simulating a dynamic environment during the measurement process.

[0006] As a preferred embodiment of the present invention, the injection unit includes a storage tank, a support frame is fixedly connected to the measuring frame, the storage tank is fixedly connected to the top of the support frame, a mounting frame is fixedly connected to the top of the measuring frame, a piston pump is fixedly connected to the mounting frame, the output end of the piston pump is fixedly connected to and communicates with the top end of the injection pipe, a suction pipe is fixedly connected to and communicates with the storage tank, the input end of the suction pipe extends to the bottom of the inner cavity of the storage tank, and the output end of the suction pipe is fixedly connected to and communicates with the input end of the piston pump.

[0007] As a preferred embodiment of the present invention, the two sets of semicircular plates are fixedly connected by bolts, and a confining pressure cavity is provided in the semicircular plate. An inflatable airbag is fixedly connected in the confining pressure cavity. A first air pipe is fixedly connected to the confining pressure cavity of both sets of semicircular plates, and a double-headed air pump is fixedly connected between the input ends of the two sets of first air pipes.

[0008] As a preferred embodiment of the present invention, the clamping part includes two sets of lifting screws, the tops of the two sets of lifting screws are respectively rotatably connected to the bottom sides of the top plate of the drain pipe, the bottom ends of the lifting screws penetrate to the bottom of the horizontal plate of the measuring frame, and the lifting screws are threaded with lifting nuts.

[0009] In a preferred embodiment of the present invention, the agitating part includes a sealing ring, which is fixedly connected to the lower outer wall of the injection tube. An outer magnetic ring is rotatably sleeved on the outer side of the sealing ring, and an inner magnetic ring is rotatably sleeved on the inner cavity of the sealing ring. The inner magnetic ring and the outer magnetic ring are magnetically attracted to each other. Multiple sets of agitating rods are fixedly fixed at equal intervals on the inner arc wall of the inner magnetic ring. Mounting seats are fixedly connected to both sides of the measuring frame. A reciprocating screw is rotatably connected between the two mounting seats. A sliding sleeve is threaded onto the reciprocating screw. A toothed plate is fixedly connected to the side wall of the sliding sleeve. A gear ring is fixedly connected to the outer wall of the outer magnetic ring. The gear ring and the toothed plate are meshed together. A drive motor is fixedly connected to one mounting seat. The output shaft of the drive motor is fixedly connected to the end of the reciprocating screw.

[0010] As a preferred embodiment of the present invention, a stirring shaft is rotatably connected inside the storage tank, and multiple sets of stirring paddles are fixed at equal intervals on the stirring shaft. The top end of the stirring shaft extends through to the top of the storage tank and is fixedly connected to a rotating arm. The other end of the rotating arm is rotatably connected to a telescopic arm, and the other end of the telescopic arm is fixedly connected to the outer wall of the sliding sleeve.

[0011] As a preferred embodiment of the present invention, the vibration unit includes two sets of vibration tables, which are respectively fixed on both sides of the lower end of the injection tube. Multiple sets of piston chambers are fixedly connected to the side of the vibration table near the injection tube. A piston plate is slidably connected inside the piston chamber. A vibration spring is fixedly connected between the side wall of the piston plate and the inner wall of the piston chamber. A fixed wedge block is fixedly connected to the other side of the piston plate. A movable wedge block is fixedly connected to the outer wall of the outer magnetic ring. The fixed wedge block and the movable wedge block are adapted to each other.

[0012] As a preferred embodiment of the present invention, multiple sets of piston chambers on the same vibration table are connected by a second air pipe. An exhaust pipe is fixed and connected to the second air pipe. Both sides of the top of the liquid storage tank are fixed and connected to a suction pipe. The other ends of the suction pipes on both sides are respectively connected to the inner cavity of the piston chambers on the vibration table on both sides. A one-way valve is provided in both the exhaust pipe and the suction pipe.

[0013] As a preferred embodiment of the present invention, a pressure sensor is installed on the injection pipe, and a back pressure regulating valve is installed on the drainage pipe.

[0014] A method for measuring the permeability of an ore includes the following steps: Step 1: Drill a cylindrical core sample from the ore and grind both ends of the sample flat; Step 2: Fix the sample between the injection tube and the drain tube; Step 3: Apply confining pressure to the outer wall of the sample to simulate formation stress conditions; Step 4: Inject the fluid medium through the injection tube and record the corresponding data. Then calculate the permeability according to Darcy's formula.

[0015] Compared with the prior art, the present invention provides an ore permeability measuring device and method, which has the following beneficial effects: 1. This ore permeability measuring device, through the linkage of a drive motor with a reciprocating screw and a magnetic coupling mechanism, simultaneously achieves the agitation of the fluid at the injection pipe inlet and the uniform stirring of the test liquid in the storage tank without damaging the high-pressure seal. This not only prevents blockage at the core inlet and promotes the uniform distribution of reactive fluid, but also avoids particle sedimentation and bubble retention, effectively improving the accuracy, repeatability, and engineering representativeness of low-permeability ore permeability measurement, and more realistically simulating the dynamic injection conditions on site.

[0016] 2. This ore permeability measuring device, through the cooperation of a moving wedge block, a fixed wedge block, and a vibration spring, simultaneously achieves vibration simulation and self-driven degassing: the vibration effect realistically reproduces underground dynamic disturbances, activates the pore channels of low-permeability ores, and improves the geological representativeness of dynamic permeability; at the same time, the reciprocating motion of the piston forms a micro-negative pressure, which, combined with stirring, efficiently removes air bubbles from the test liquid, eliminates the illusion of airlock and non-Darcy flow, and significantly improves the reliability of permeability measurement of low-permeability and dense ores.

[0017] 3. This ore permeability measuring device achieves rapid and precise core clamping through a lifting nut and a double semi-circular plate structure. Combined with a pneumatic expansion airbag to uniformly apply confining pressure, it effectively simulates formation stress, closes micro-fractures, and prevents leakage of the test fluid. Combined with a back pressure regulating valve and a pressure sensor to precisely control the pressure difference at both ends of the sample, it ensures steady-state flow conditions and significantly improves the sealing, stability, and data accuracy of permeability measurement of low-permeability ores. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0019] Figure 1 This is a first-view perspective stereoscopic diagram of the present invention; Figure 2 This is a second-view perspective stereoscopic diagram of the present invention; Figure 3 This is a schematic cross-sectional view of the semi-circular plate of the present invention; Figure 4 This is a third-view perspective stereoscopic diagram of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram of region A in the middle; Figure 6 This is a schematic diagram of a partial transverse cross-sectional structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of region B in the middle; Figure 8 This is a partial cross-sectional view of the lower end of the injection tube of the present invention; Figure 9 For the present invention Figure 8 A magnified structural diagram of region C in the middle.

[0020] In the diagram: 1. Measuring frame; 2. Injection pipe; 21. Drain pipe; 3. Semicircular plate; 31. Confining pressure chamber; 32. Inflatable air bladder; 33. First air pipe; 34. Dual-head air pump; 4. Storage tank; 41. Support frame; 42. Mounting frame; 43. Piston pump; 44. Suction pipe; 45. Stirring shaft; 46. Stirring paddle; 47. Rotating arm; 471. Telescopic arm; 5. Lifting screw; 51. Lifting nut; 6. Sealing ring; 61. 62. Outer magnetic ring; 63. Inner magnetic ring; 64. Stirring rod; 65. Mounting base; 66. Reciprocating lead screw; 67. Sliding sleeve; 68. Gear plate; 69. Gear ring; 70. Drive motor; 71. Vibration table; 72. Piston chamber; 73. Piston plate; 74. Vibration spring; 75. Fixed wedge block; 76. Moving wedge block; 77. Second air pipe; 78. Exhaust pipe; 89. Suction pipe; 80. Pressure sensor; 81. Back pressure regulating valve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Reference Figures 1-9 A permeability measuring device for ore includes a measuring frame 1, an injection pipe 2 fixedly connected to the upper part of the measuring frame 1, a pressure sensor 8 installed on the injection pipe 2, and an injection part installed at the top of the injection pipe 2. It also includes a sealing element composed of two sets of semi-circular plates 3. A drain pipe 21 is slidably connected to the lower part of the measuring frame 1, and a back pressure regulating valve 81 is installed on the drain pipe 21. The two sets of semi-circular plates 3 are fixedly wrapped around the ends of the injection pipe 2 and the drain pipe 21 that are close to each other. A clamping part, a stirring part, and a vibrating part are installed on the drain pipe 2 and used to agitate and mix the liquid passing through the ore sample. The vibrating part is also installed on the injection pipe 2 and used to simulate the dynamic environment during the measurement process.

[0023] Reference Figures 1-4The injection unit includes a storage tank 4, a support frame 41 fixedly connected to the measuring frame 1, and the storage tank 4 fixedly connected to the top of the support frame 41. The storage tank 4 is filled with sample measuring liquid, and deionized water or formation water simulation liquid can be selected according to different measurement requirements. A mounting frame 42 is fixedly connected to the top of the measuring frame 1, and a piston pump 43 is fixedly connected to the mounting frame 42. The output end of the piston pump 43 is fixedly connected to and communicates with the top end of the injection pipe 2. A suction pipe 44 is fixedly connected to and communicates with the storage tank 4. The input end of the suction pipe 44 extends to the bottom of the inner cavity of the storage tank 4, and the output end of the suction pipe 44 is connected to the piston pump 43. The input end is fixed and connected; the two sets of semicircular plates 3 are fixedly connected by bolts, and a confining pressure cavity 31 is opened in the semicircular plate 3. An inflatable air bladder 32 is fixedly connected in the confining pressure cavity 31. The confining pressure cavity 31 of the two sets of semicircular plates 3 is fixed and connected to a first air pipe 33. A double-headed air pump 34 is fixedly connected between the input ends of the two sets of first air pipes 33. The clamping part includes two sets of lifting screws 5. The tops of the two sets of lifting screws 5 are respectively rotatably connected to the bottom sides of the top plate of the drain pipe 21. The bottom end of the lifting screw 5 penetrates to the bottom of the horizontal plate of the measuring frame 1, and a lifting nut 51 is threaded on the lifting screw 5.

[0024] With the above structure, a cylindrical core sample is first drilled from the ore, and both ends of the sample are ground flat. The sample is then placed between the injection pipe 2 and the drainage pipe 21. The lifting nut 51 is then rotated to move the drainage pipe 21 upwards, ultimately clamping and fixing the sample between the injection and drainage pipes 21. Next, two sets of semi-circular plates 3 are bolted and wrapped around the ends of the injection and drainage pipes 21 that are close to each other. Then, the dual-headed air pump 34 is fixed and connected to the first air pipes 33 on both sides. The dual-headed air pump 34 is then turned on, injecting gas into the confining pressure chamber 31, causing the inflatable airbag 32 to expand and approach the outer wall of the sample, ultimately wrapping around it. This simulates the formation stress conditions, restores the true underground mechanical state, and simultaneously addresses any micro-cracks existing on the outer wall of the sample. By sealing the pore throat to prevent the measuring liquid from leaking out, the accuracy of the final measurement result is improved. Next, the pressure in the drain pipe 21 is adjusted to the preset value through the back pressure regulating valve 81 on the drain pipe 21. Then, the piston pump 43 is turned on to draw the measuring liquid from the storage tank 4, and then it is delivered to the top of the sample through the injection pipe 2. The pressure sensor 8 controls the injection pipe 2 to always maintain the preset pressure value. During the measurement process, the back pressure regulating valve 81 always ensures that the pressure in the drain pipe 21 is within the preset value range. When the measurement reaches a steady state, the corresponding data (including the flow rate through the sample per unit time, the pressure difference between the two ends of the sample, the sample length, the sample cross-sectional area, and the fluid viscosity) are recorded. Then, the permeability of the sample can be calculated by substituting it into Darcy's formula.

[0025] Darcy's formula for calculating permeability is as follows: In the formula: For penetration rate, The flow rate through the sample per unit time. Pressure difference between the two ends of the sample The length of the sample. Cross-sectional area of ​​the sample This represents the fluid viscosity.

[0026] In addition, by adjusting the height of the drain pipe 21, it can be used for samples of different lengths, thus improving the applicability of the device.

[0027] Reference Figures 6-9 The stirring part includes a sealing ring 6, which is fixedly connected to the lower outer wall of the injection tube 2. An outer magnetic ring 61 is rotatably sleeved on the outer side of the sealing ring 6, and an inner magnetic ring 62 is rotatably sleeved inside the sealing ring 6. The inner magnetic ring 62 and the outer magnetic ring 61 are magnetically attracted to each other. Multiple sets of stirring rods 63 are fixed at equal intervals on the inner arc wall of the inner magnetic ring 62. Mounting seats 64 are fixedly connected to both sides of the measuring frame 1. A reciprocating screw 65 is rotatably connected between the two mounting seats 64. A sliding sleeve 66 is threaded on the reciprocating screw 65. A toothed plate 661 is fixedly connected to the side wall of the sliding sleeve 66. The outer magnetic ring 6... A gear ring 67 is fixedly connected to the outer wall of the storage tank 1. The gear ring 67 is meshed with the toothed plate 661. A drive motor 68 is fixedly connected to the mounting base 64 on one side. The output shaft of the drive motor 68 is fixedly connected to the end of the reciprocating screw 65. A stirring shaft 45 is rotatably connected inside the storage tank 4. Multiple sets of stirring paddles 46 are fixed at equal intervals on the stirring shaft 45. The top end of the stirring shaft 45 extends through to the top of the storage tank 4 and is fixedly connected to a rotating arm 47. The other end of the rotating arm 47 is rotatably connected to a telescopic arm 471. The other end of the telescopic arm 471 is fixedly connected to the outer wall of the sliding sleeve 66.

[0028] With the above-described structure, during the measurement process, the drive motor 68 is activated, causing it to rotate the reciprocating screw 65. This causes the sliding sleeve 66, carrying the toothed plate 661, to slide back and forth along the reciprocating screw 65. The meshing connection between the gear ring 67 and the toothed plate 661 drives the outer magnetic ring 61 to rotate. Combined with the magnetic coupling between the inner magnetic ring 62 and the outer magnetic ring 61, this causes the inner magnetic ring 62 and the stirring rod 63 to rotate within the inner cavity of the injection tube 2 near the sample. Thus, without disrupting the high-pressure seal, the inlet fluid of the sample is agitated, completing the dynamic injection simulation. This design closely matches current working conditions and effectively prevents inlet blockage, improving the reliability of low-permeability ore measurements. It also promotes the uniform distribution of reactive fluids, significantly improving the accuracy of permeability measurements. Furthermore, during the reciprocating sliding of the sliding sleeve 66, the telescopic arm 471 and the rotating arm 47 drive the stirring shaft 45 to rotate, causing the stirring paddle 46 to agitate the test fluid in the storage tank 4, achieving a uniform distribution of the test fluid. The dynamic agitation ensures that key issues such as particle sedimentation and reaction imbalance do not occur during testing, significantly improving the accuracy of core permeability measurements.

[0029] Reference Figure 4 , Figure 5 and Figure 9 The vibrating part includes two sets of vibrating tables 7, which are fixed on both sides of the lower end of the injection pipe 2. Multiple sets of piston chambers 71 are fixedly connected to the side of the vibrating table 7 closest to the injection pipe 2. A piston plate 72 is slidably connected inside the piston chamber 71. A vibration spring 73 is fixedly connected between the side wall of the piston plate 72 and the inner wall of the piston chamber 71. A fixed wedge block 74 is fixedly connected to the other side of the piston plate 72. A movable wedge block 75 is fixedly connected to the outer wall of the outer magnetic ring 61. The fixed wedge block 74 and the movable wedge block 75 are adapted to each other. Multiple sets of piston chambers 71 on the same vibrating table 7 are connected to each other through a second air pipe 76. An exhaust pipe 761 is fixed and connected to the second air pipe 76. Both sides of the top of the storage tank 4 are fixed and connected to suction pipes 77. The other ends of the suction pipes 77 on both sides are connected to the inner cavity of the piston chambers 71 on the two vibrating tables 7. A one-way valve is provided in both the exhaust pipe 761 and the suction pipe 77.

[0030] It should be noted that the one-way valve in the exhaust pipe 761 can only allow the gas in the piston chamber 71 to be discharged along the second air pipe 76 and the exhaust pipe 761; the one-way valve in the suction pipe 77 can only allow the gas in the liquid storage tank 4 to enter the piston chamber 71 along the suction pipe 77 and the second air pipe 76.

[0031] With the above-described structure, during the rotation of the outer magnetic ring 61, the fixed wedge block 74 and the moving wedge block 75 will intermittently contact each other. Under the action of rotational torque, the moving wedge block 75 will exert a squeezing force on the fixed wedge block 74, causing the fixed wedge block 74 to push the piston plate 72 into the piston chamber 71 and squeeze the vibration spring 73. When the moving wedge block 75 passes over the fixed wedge block 74, under the rebound action of the vibration spring 73, the fixed wedge block 74 will quickly rebound and eventually impact the outer wall of the outer magnetic ring 61. This generates a vibration effect during the measurement process, realistically simulating the underground dynamic disturbance environment and activating the pore channels of low-permeability ore, thus improving the reliability of the measurement. This not only effectively improves the authenticity and reliability of low-permeability ore permeability measurement, but also provides an innovative experimental method for multi-physics field coupled seepage research, obtaining more geologically significant dynamic permeability, thereby improving the representativeness of the detection results. When the piston plate 72 slides into the piston chamber 71, it compresses the gas inside the piston chamber 71 and opens the one-way valve in the exhaust pipe 761, allowing the gas inside the piston chamber 71 to be discharged along the second gas pipe 76 and the exhaust pipe 761. When the piston plate 72 returns to its original position under the rebound action of the vibration spring 73, it generates a negative pressure suction force in the piston chamber 71, thereby opening the one-way valve in the suction pipe 77 and extracting the gas from the top of the inner cavity of the liquid storage tank 4. This creates a slightly negative pressure state in the inner cavity of the liquid storage tank 4. Combined with the stirring action of the stirring paddle 46, it can quickly expel the air bubbles in the test liquid, significantly improving the degassing speed and thoroughness. This achieves degassing of the test liquid, preventing the gas mixed in the test liquid from precipitating at the low-pressure end and forming an airlock that blocks the flow. It also avoids the false "non-Darcy flow" phenomenon caused by air bubbles, significantly improving the reliability and accuracy of core permeability experiments, especially for low-permeability and dense ore tests.

[0032] In addition, this device can be used for both dynamic and static simulation measurements. That is, the drive motor 68 is turned off during static measurement and turned on during dynamic measurement. By combining the data from the two states, the permeability of the sample can be better analyzed, thus improving the representativeness of the measurement results.

[0033] Example 2: Reference Figures 1-9 Similar to Example 1, but based on Example 1, a method for measuring ore permeability is proposed, including the following steps: Step 1: Drill a cylindrical core sample from the ore and grind both ends of the sample flat; Step 2: Fix the sample between the injection tube 2 and the drain tube 21; Step 3: Apply confining pressure to the outer wall of the sample to simulate formation stress conditions; Step 4: Inject the fluid medium through injection tube 2 and record the corresponding data. Then calculate the permeability according to Darcy's formula.

[0034] Reference Figures 1-9 In this invention, during use, a cylindrical core sample is first drilled from the ore, and both ends of the sample are ground flat. The sample is then placed between the injection pipe 2 and the drainage pipe 21. The lifting nut 51 is then rotated to push the drainage pipe 21 upwards, ultimately clamping and fixing the sample between the injection pipe 2 and the drainage pipe 21. Next, two sets of semi-circular plates 3 are bolted and wrapped around the ends of the injection pipe 2 and the drainage pipe 21 that are close to each other. Then, the double-headed air pump 34 is fixed and connected to the first air pipes 33 on both sides. The double-headed air pump 34 is then turned on, injecting gas into the confining pressure chamber 31, causing the expansion airbag 32 to expand and approach the outer wall of the sample, ultimately wrapping around the outer wall of the sample, thereby simulating formation stress conditions and restoring... The actual underground mechanical state is measured, and the micro-cracks and pore throats on the outer wall of the sample are sealed to prevent the measuring fluid from seeping out, thereby improving the accuracy of the final measurement results. Next, the pressure in the drain pipe 21 is adjusted to the preset value by the back pressure regulating valve 81 on the drain pipe 21. Then, the piston pump 43 is turned on to draw the measuring fluid from the storage tank 4, and then it is delivered to the top of the sample through the injection pipe 2. The pressure sensor 8 controls the injection pipe 2 to always maintain the preset pressure value. During the measurement process, the back pressure regulating valve 81 always ensures that the pressure in the drain pipe 21 is within the preset value range. When the measurement reaches a steady state, the corresponding data is recorded, and then substituted into Darcy's formula to calculate the permeability of the sample.

[0035] In addition, during the measurement process, the drive motor 68 is turned on, causing it to rotate the reciprocating screw 65. This causes the sliding sleeve 66, carrying the toothed plate 661, to slide back and forth along the reciprocating screw 65. This, combined with the meshing connection between the gear ring 67 and the toothed plate 661, drives the outer magnetic ring 61 to rotate. Furthermore, the magnetic coupling between the inner magnetic ring 62 and the outer magnetic ring 61 causes the inner magnetic ring 62 and the stirring rod 63 to rotate within the inner cavity of the injection tube 2 near the sample. In this way, without disrupting the high-pressure seal, the fluid entering the sample is agitated, completing the dynamic injection simulation, which is closer to reality. Under operating conditions, it effectively prevents blockage at the inlet end, improves the reliability of low-permeability ore measurement, and promotes the uniform distribution of reactive fluid, significantly improving the accuracy of permeability measurement. Furthermore, during the reciprocating sliding of the sliding sleeve 66, the telescopic arm 471 and the rotating arm 47 can drive the stirring shaft 45 to rotate, so that the stirring paddle 46 agitates the test fluid in the storage tank 4, achieving uniform distribution of the test fluid. The dynamic agitation ensures that key issues such as particle sedimentation and reaction imbalance will not occur during the test, significantly improving the accuracy of core permeability measurement.

[0036] Furthermore, during the rotation of the outer magnetic ring 61, the fixed wedge block 74 and the moving wedge block 75 will intermittently contact each other. Under the action of rotational torque, the moving wedge block 75 will exert a squeezing force on the fixed wedge block 74, causing the fixed wedge block 74 to push the piston plate 72 into the piston chamber 71 and squeeze the vibration spring 73. When the moving wedge block 75 passes over the fixed wedge block 74, under the rebound action of the vibration spring 73, the fixed wedge block 74 will quickly rebound and eventually impact the outer wall of the outer magnetic ring 61, thereby generating a vibration effect during the measurement process. This realistically simulates the underground dynamic disturbance environment and activates the pore channels of low-permeability ore, improving the reliability of the measurement. This not only effectively improves the authenticity and reliability of low-permeability ore permeability measurement, but also provides an innovative experimental method for multi-physics field coupled seepage research, obtaining more geologically significant dynamic permeability, thereby improving the representativeness of the detection results; and when the piston plate When piston plate 72 slides into piston chamber 71, it compresses the gas inside piston chamber 71 and opens the one-way valve in exhaust pipe 761, allowing the gas inside piston chamber 71 to be discharged along the second gas pipe 76 and exhaust pipe 761. When piston plate 72 returns to its original position and slides under the rebound action of vibration spring 73, it generates negative pressure suction in piston chamber 71, thereby opening the one-way valve in suction pipe 77 to extract the gas from the top of the inner cavity of storage tank 4, making the inner cavity of storage tank 4 in a slightly negative pressure state. Combined with the stirring action of stirring paddle 46, it can quickly expel air bubbles in the test liquid, significantly improving the degassing speed and thoroughness, thereby achieving degassing of the test liquid, avoiding the precipitation of gas mixed in the test liquid at the low pressure end, forming an air lock to block the flow, avoiding the false "non-Darcy flow" phenomenon caused by air bubbles, and significantly improving the reliability and accuracy of core permeability experiments, especially low-permeability and dense ore tests.

[0037] Components not described in detail in this article are existing technologies.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring the permeability of an ore, comprising a measuring frame (1), characterized in that, The upper part of the measuring frame (1) is fixedly connected to the injection tube (2), and the top of the injection tube (2) is equipped with an injection part, and the frame also includes: The sealing element consists of two sets of semi-circular plates (3). The measuring frame (1) is slidably connected to a drain pipe (21) at its lower part. Two sets of semicircular plates (3) are fixedly wrapped around the ends of the injection pipe (2) and the drain pipe (21) that are close to each other. A clamping part is installed on the drain pipe (21). A stirring unit is installed on the injection pipe (2) and is used to stir the liquid that mixes and passes through the ore sample. The vibrating part is installed on the injection tube (2) and is used to simulate the dynamic environment during the measurement process.

2. The ore permeability measuring device according to claim 1, characterized in that, The injection unit includes a storage tank (4), a support frame (41) is fixedly connected to the measuring frame (1), the storage tank (4) is fixedly connected to the top of the support frame (41), a mounting frame (42) is fixedly connected to the top of the measuring frame (1), a piston pump (43) is fixedly connected to the mounting frame (42), the output end of the piston pump (43) is fixed and connected to the top of the injection pipe (2), a suction pipe (44) is fixed and connected to the storage tank (4), the input end of the suction pipe (44) extends to the bottom of the inner cavity of the storage tank (4), and the output end of the suction pipe (44) is fixed and connected to the input end of the piston pump (43).

3. The ore permeability measuring device according to claim 1, characterized in that, The two sets of semicircular plates (3) are fixedly connected by bolts. A confining pressure cavity (31) is provided in the semicircular plate (3). An inflatable airbag (32) is fixedly connected in the confining pressure cavity (31). A first air pipe (33) is fixed and connected to the confining pressure cavity (31) of the two sets of semicircular plates (3). A double-headed air pump (34) is fixedly connected between the input ends of the two sets of first air pipes (33).

4. The ore permeability measuring device according to claim 1, characterized in that, The clamping part includes two sets of lifting screws (5). The tops of the two sets of lifting screws (5) are rotatably connected to the bottom sides of the top plate of the drain pipe (21). The bottom end of the lifting screw (5) extends through to the bottom of the horizontal plate of the measuring frame (1), and a lifting nut (51) is threaded on the lifting screw (5).

5. The ore permeability measuring device according to claim 2, characterized in that, The stirring part includes a sealing ring (6), which is fixedly connected to the lower outer wall of the injection tube (2). An outer magnetic ring (61) is rotatably sleeved on the outer side of the sealing ring (6), and an inner magnetic ring (62) is rotatably sleeved inside the sealing ring (6). The inner magnetic ring (62) and the outer magnetic ring (61) are magnetically attracted to each other. Multiple sets of stirring rods (63) are fixed at equal intervals on the inner arc wall of the inner magnetic ring (62). Mounting seats (64) are fixedly connected to both sides of the measuring frame (1). 4) A reciprocating lead screw (65) is rotatably connected between the two parts. A sliding sleeve (66) is threaded on the reciprocating lead screw (65). A toothed plate (661) is fixedly connected to the side wall of the sliding sleeve (66). A gear ring (67) is fixedly connected to the outer wall of the outer magnetic ring (61). The gear ring (67) and the toothed plate (661) are meshed together. A drive motor (68) is fixedly connected to the mounting base (64) on one side. The output shaft of the drive motor (68) is fixedly connected to the end of the reciprocating lead screw (65).

6. The ore permeability measuring device according to claim 5, characterized in that, A stirring shaft (45) is rotatably connected inside the storage tank (4). Multiple sets of stirring paddles (46) are fixed at equal intervals on the stirring shaft (45). The top end of the stirring shaft (45) extends through to the top of the storage tank (4) and is fixedly connected to a rotating arm (47). The other end of the rotating arm (47) is rotatably connected to a telescopic arm (471). The other end of the telescopic arm (471) is fixedly connected to the outer wall of the sliding sleeve (66).

7. The ore permeability measuring device according to claim 5, characterized in that, The vibration unit includes two sets of vibration tables (7). The two sets of vibration tables (7) are fixed on both sides of the lower end of the injection tube (2). Multiple sets of piston chambers (71) are fixedly connected to the side of the vibration table (7) near the injection tube (2). A piston plate (72) is slidably connected inside the piston chamber (71). A vibration spring (73) is fixedly connected between the side wall of the piston plate (72) and the inner wall of the piston chamber (71). A fixed wedge block (74) is fixedly connected to the other side of the piston plate (72). A moving wedge block (75) is fixedly connected to the outer wall of the outer magnetic ring (61). The fixed wedge block (74) and the moving wedge block (75) are adapted to each other.

8. The ore permeability measuring device according to claim 7, characterized in that, Multiple sets of piston chambers (71) on the same vibration table (7) are connected by a second air pipe (76). An exhaust pipe (761) is fixed and connected to the second air pipe (76). Both sides of the top of the liquid storage tank (4) are fixed and connected to suction pipes (77). The other ends of the suction pipes (77) on both sides are connected to the inner cavity of the piston chambers (71) on the vibration table (7) on both sides. A one-way valve is provided in both the exhaust pipe (761) and the suction pipe (77).

9. The ore permeability measuring device according to claim 1, characterized in that, A pressure sensor (8) is installed on the injection pipe (2), and a back pressure regulating valve (81) is installed on the discharge pipe (21).

10. A method for measuring the permeability of an ore, using the ore permeability measuring device as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Drill a cylindrical core sample from the ore and grind both ends of the sample flat; Step 2: Fix the sample between the injection tube (2) and the drain tube (21); Step 3: Apply confining pressure to the outer wall of the sample to simulate formation stress conditions; Step 4: Inject the fluid medium through the injection tube (2) and record the corresponding data. Then calculate the permeability according to Darcy's formula.

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