An experimental rock stratum fracturing device and a rock stratum fracturing construction method

Abstract

The present application relates to a kind of experimental rock stratum fracturing device and rock stratum fracturing construction method, experimental rock stratum fracturing device includes cylinder, drive shaft, fracturing component and driving piece. Partition is arranged in cylinder, and fracturing window is arranged on the lateral wall of cylinder. Drive shaft is coaxially arranged in cylinder. Fracturing component includes hatchet, sliding block and connecting rod, sliding block is slidably arranged on partition, one end of connecting rod is hinged with drive shaft, the other end is hinged with sliding block, hatchet is detachably connected with sliding block. Driving piece is connected with one end of drive shaft, and driving piece is used to drive drive shaft to move along the axis direction of cylinder, to drive hatchet to move towards the outside of cylinder through fracturing window. Directly insert cylinder into rock stratum, without sampling on rock stratum and moving to laboratory to carry out fracturing experiment. The front end of hatchet is embedded in crack, and crack is supported, the stability of crack is improved, sufficient time is provided for the measurement of experimental data, and the measured data is more accurate.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration technology, and in particular to an experimental rock fracturing device and a rock fracturing construction method. Background Technology

[0002] Fracturing is a mature technology in oil and gas extraction. Typically, before oil and gas extraction, it is necessary to sample and test the rock formations in the extraction area to obtain data on various physical properties of the formations, which guides subsequent extraction operations. A common fracturing test method involves transferring rock samples to a laboratory, conducting fracturing tests on the samples using fracturing equipment, and measuring various experimental data. Due to the small overall size of the samples, their mechanical properties may deviate significantly from the overall rock formations in the extraction area. Furthermore, oil and gas can easily escape from the samples during transport. Therefore, the experimental data collected from the samples may deviate from the actual physical properties of the rock formations. The fracturing equipment commonly used in fracturing experiments primarily fractures the samples through direct compression. When the pressure is released, the fractures formed on the sample close. Therefore, the data collection window is short, and data must be collected before the fractures close. Simultaneously, the closure of the fractures also leads to inaccurate fracture morphology data. Summary of the Invention

[0003] The purpose of this invention is to provide an experimental rock fracturing device and a rock fracturing construction method, which produces highly stable fractures and provides highly accurate experimental data.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] An experimental rock fracturing device is provided, comprising:

[0006] A cylindrical body, wherein a baffle is provided inside the cylindrical body, the baffle is perpendicular to the axis of the cylindrical body, and a fracturing window is provided through the side wall of the cylindrical body;

[0007] A drive shaft, which is coaxially disposed inside the cylinder;

[0008] A fracturing assembly, comprising a fracturing axe, a slider, and a connecting rod, wherein the slider is slidably disposed on the partition plate, one end of the connecting rod is hinged to the drive shaft, and the other end is hinged to the slider, and the fracturing axe is detachably connected to the slider;

[0009] A driving component is located outside the cylinder and is connected to one end of the driving shaft. The driving component is used to drive the driving shaft to move along the axial direction of the cylinder so as to drive the fracturing axe through the fracturing window toward the outside of the cylinder via the connecting rod and the slider.

[0010] Furthermore, it also includes an air supply component. The end of the fracturing axe away from the slider is the axe blade. An air supply channel is provided inside the fracturing axe. The inlet end of the air supply channel is connected to the air supply component, and the outlet end of the air supply channel extends to the axe blade.

[0011] Furthermore, the fracturing axe includes an axe head and an axe handle portion disposed on the axe head. The axe head forms the axe blade portion at one end opposite to the axe handle portion. The axe handle portion is threadedly connected to the slider. The air supply channel communicates with the slider. The air supply assembly includes an air compressor and an air supply pipe. The air compressor is communicated with the slider through the air supply pipe.

[0012] Furthermore, there are multiple fracturing components, which are spaced apart along the circumferential direction of the drive shaft.

[0013] Furthermore, there are multiple baffles, which are distributed at intervals along the axial direction of the cylinder, and each baffle is provided with a corresponding fracturing component.

[0014] Furthermore, it also includes a reinforcing component, which includes a sleeve and a plurality of reinforcing rods. The sleeve is coaxially arranged with the cylinder body, and the plurality of reinforcing rods are spaced apart along the circumferential direction of the sleeve. The two ends of the reinforcing rods are respectively connected to the inner wall of the sleeve and the inner wall of the cylinder body.

[0015] Furthermore, along the axial direction of the cylinder, the reinforcing components are provided on both sides of the partition.

[0016] Furthermore, the cylinder includes a main body and a positioning part disposed at the bottom end of the main body, the drive shaft is disposed inside the main body, and the bottom end of the drive shaft is inserted into the positioning part.

[0017] Furthermore, a spring is provided inside the positioning part, and the drive shaft is elastically connected to the positioning part through the spring.

[0018] A rock fracturing construction method is also provided, along with an experimental rock fracturing device, comprising the following steps:

[0019] Step S10: Drill an installation hole vertically downwards in the rock stratum, and drill a positioning hole at the bottom of the installation hole, the positioning hole being coaxial with the installation hole;

[0020] Step S20: Insert the cylinder of the experimental rock fracturing device into the mounting hole, and insert the positioning part at the bottom of the cylinder into the positioning hole;

[0021] Step S30: Fix the drive component to the outside of the mounting hole, and connect the output end of the drive component to the drive shaft of the experimental rock fracturing device. Use the drive component to drive the drive shaft down so that the fracturing axe passes through the cylinder and applies pressure to the hole wall of the mounting hole.

[0022] When installing the fracturing axe, adjust the fracturing axe to a horizontal position to create transverse cracks in the rock strata; or, adjust the fracturing axe to a vertical position to create longitudinal cracks in the rock strata.

[0023] Step S40: High-pressure gas is introduced into the gas supply channel of the fracturing axe using the gas supply assembly, and the high-pressure gas is used to diffuse into the transverse crack or the longitudinal crack.

[0024] The advantages of this invention compared to the prior art are:

[0025] This invention discloses an experimental rock fracturing device and method. By directly inserting the fracturing cylinder into the rock strata, fracturing is performed without the need to take samples from the rock strata and transport them to a laboratory for fracturing experiments. Experimental data collected directly from the rock strata deviate less from the overall physical properties of the rock strata, resulting in more accurate data. During fracturing, the tip of the fracturing axe embeds itself into the fracture, providing support and improving fracture stability. This prevents the fracture from closing after pressure is released, allowing sufficient time for data measurement, and the fracture morphology remains unchanged, leading to more accurate measurements. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an experimental rock fracturing device according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the cylinder being installed in a rock stratum according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the rock strata in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of a fracturing axe according to an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of a fracturing assembly for fracturing longitudinal cracks according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of a fracturing assembly for fracturing transverse cracks according to an embodiment of the present invention.

[0032] In the figure: 1. Cylinder; 11. Main body; 12. End plate; 13. Positioning part; 14. Fracturing window; 15. Spring; 2. Drive shaft; 3. Partition plate; 31. Connecting hole; 4. Reinforcing assembly; 41. Sleeve; 42. Reinforcing rod; 5. Fracturing assembly; 51. Fracturing axe; 511. Axe head; 512. Axe handle; 513. Axe blade; 514. Gas supply channel; 515. External thread; 52. Slider; 53. Connecting rod; 100. Rock stratum; 110. Mounting hole; 120. Positioning hole; 130. Longitudinal fracture; 140. Transverse fracture. Detailed Implementation

[0033] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 6 As shown, this invention provides an experimental rock fracturing device (hereinafter referred to as the fracturing device) for performing fracturing experiments on rock formation 100 to form transverse fractures 140 and longitudinal fractures 130 on the rock formation 100 for experimental analysis. The fracturing device includes a cylinder 1, a drive shaft 2, a fracturing assembly 5, and a drive component (not shown in the figure). The cylinder 1 provides overall support and installation space for the drive shaft 2 and the fracturing assembly 5. The fracturing assembly 5 is the direct execution component for the fracturing process, utilizing the mutual compression between the fracturing assembly 5 and the rock formation 100 to obtain transverse fractures 140 or longitudinal fractures 130. The drive shaft 2 transmits power, and the drive component provides power. The fracturing assembly 5 and the drive component are connected via the drive shaft 2, so that the power output by the drive component can be transmitted to the fracturing assembly 5 through the drive shaft 2.

[0035] The cylinder 1 is a hollow cylindrical structure, and a partition 3 is installed inside the cylinder 1. The partition 3 is used to support the fracturing assembly 5, and the partition 3 is arranged perpendicular to the axis of the cylinder 1. A fracturing window 14 is provided through the side wall of the cylinder 1 to allow communication between the inside and outside of the cylinder 1. The position of the fracturing window 14 corresponds to the fracturing assembly 5 so that the fracturing assembly 5 can pass through the fracturing window 14 and contact the rock strata 100 outside the cylinder 1. The drive shaft 2 is disposed inside the cylinder 1 and is coaxial with the cylinder 1. Correspondingly, the partition 3 is provided with a connecting hole 31 for the drive shaft 2 to pass through, and the drive shaft 2 passes through the connecting hole 31. The fracturing assembly 5 includes a fracturing axe 51, a slider 52, and a connecting rod 53. The slider 52 is slidably disposed on the partition 3, and the sliding direction of the slider 52 is radial to the cylinder 1. One end of the connecting rod 53 is hinged to the drive shaft 2, and the other end is hinged to the slider 52. The hinge point between the connecting rod 53 and the drive shaft 2 is higher than the hinge point between the connecting rod 53 and the slider 52, so that when the drive shaft 2 moves downward, the connecting rod 53 can push the slider 52 to slide along the center of the cylinder 1 towards the periphery. The overall shape of the fracturing axe 51 is similar to that of an axe in the prior art, using its front axe blade 513 to fracture the rock layer 100. The fracturing axe 51 and the slider 52 are detachably connected to facilitate adjustment of the installation direction of the fracturing axe 51. The driving component is a hydraulic cylinder or a jack. In this embodiment, a jack is used as the driving component to facilitate field installation and use. The driving component is installed on the outside of the cylinder 1, and the output end of the driving component is connected to one end of the drive shaft 2. Correspondingly, one end of the drive shaft 2 extends to the outside of the cylinder 1. The driving component is used to drive the drive shaft 2 to move along the axial direction of the cylinder 1, and then drive the fracturing axe 51 to move radially along the cylinder 1 through the connecting rod 53 and the slider 52. Driven by the drive shaft 2, the fracturing axe 51 moves through the fracturing window 14 toward the outside of the cylinder 1. The fracturing axe 51 contacts the rock stratum 100 and applies pressure to cause cracks in the rock stratum 100.

[0036] Understandably, during fracturing experiments, this fracturing device directly inserts the cylinder 1 into the rock formation 100, and then uses a drive component to drive the drive shaft 2 downwards, thereby using the fracturing axe 51 to create fractures in the rock formation 100. This eliminates the need to take samples from the rock formation 100 and transfer them to the laboratory for fracturing experiments, avoiding oil and gas loss during sample transfer and ensuring more accurate experimental data. Furthermore, during fracturing, the fracturing axe 51 moves towards the rock formation 100, and once a fracture is created, the tip of the fracturing axe 51 inserts into the fracture. This structure helps maintain the fractures in the rock formation 100, preventing fracture closure after pressure loss, providing sufficient time for data acquisition on fracture physical properties, and ensuring more accurate data acquisition.

[0037] Specifically, refer to Figure 1 and Figure 3As shown, the cylinder 1 includes a main body 11, an end plate 12, and a positioning part 13. The main body 11 has a hollow cylindrical structure, with an opening at the top. The drive shaft 2, the partition plate 3, and the fracturing assembly 5 are all installed inside the main body 11. The end plate 12 is located at the top of the main body 11 and has a ring structure. One side of the inner ring of the end plate 12 is connected to the periphery of the main body 11, and the other side of the outer ring of the end plate 12 extends away from the main body 11. The positioning part 13 is located at the bottom of the main body 11, and the bottom end of the drive shaft 2 is inserted into the positioning part 13. Correspondingly, the rock stratum 100 is provided with a mounting hole 110 for installing the fracturing device, and the shape of the mounting hole 110 matches the shape of the cylinder 1. The bottom of the mounting hole 110 is provided with a positioning hole 120 for installing the positioning part 13. The positioning hole 120 is coaxial with the mounting hole 110, and the diameter of the positioning hole 120 is smaller than the diameter of the mounting hole 110. The positioning part 13 is inserted into the positioning hole 120. It is understood that because the positioning part 13 is inserted into the positioning hole 120, the drive shaft 2 is also inserted into the positioning part 13, thus positioning the drive shaft 2 at the center of the mounting hole 110 of the rock layer 100. Simultaneously, the bottom end of the drive shaft 2 is fixed by the positioning hole 120 to prevent displacement of the drive shaft 2 due to radial pressure during fracturing. When the cylinder 1 is installed in the mounting hole 110, the end plate 12 is located on the top surface of the rock layer 100, and the end plate 12 can be used to bear the downward force of the entire fracturing device. Alternatively, the drive component can be mounted on the end plate 12 to transmit the reaction force generated when the drive component presses down on the drive shaft 2 to the end plate 12.

[0038] The positioning part 13 has a hollow cylindrical structure, with one end located inside the cylinder 1 and the other end protruding from the bottom surface of the cylinder 1. A spring 15 is installed inside the positioning part 13, and the drive shaft 2 is inserted into the positioning part 13, elastically connected to the positioning part 13 via the spring 15. Understandably, during fracturing, the fracturing axe 51 will pass through the fracturing window 14 and partially embed itself in the rock layer 100. At this time, the cylinder 1 cannot be removed upwards from the mounting hole 110. By providing the spring 15, the drive shaft 2 compresses the spring 15 when moving downwards. After fracturing is completed, the drive component releases the downward pressure, and the spring 15 can drive the drive shaft 2 upwards back to its initial position, allowing the fracturing axe 51 to retract into the cylinder 1 so that the cylinder 1 can be removed from the mounting hole 110.

[0039] The fracturing device also includes a reinforcing component 4, which strengthens the overall structure of the fracturing device. The reinforcing component 4 includes a sleeve 41 and multiple reinforcing rods 42. The sleeve 41 is coaxially arranged with the cylinder 1, and the drive shaft 2 passes through the sleeve 41, allowing it to slide up and down within the sleeve 41. Multiple reinforcing rods 42 are spaced apart along the circumference of the sleeve 41, with both ends of each rod connected and fixed to the inner walls of the sleeve 41 and the cylinder 1, respectively. Understandably, during fracturing, the reaction force generated by the fracturing axe 51 acts radially along the cylinder 1 on the drive shaft 2. By providing the reinforcing component 4 within the cylinder 1, the force on the drive shaft 2 is strengthened. During fracturing, the reaction force of the fracturing axe 51 can be distributed to the cylinder 1 through the reinforcing component 4, preventing the drive shaft 2 from bending and deforming due to excessive localized stress. Reinforcing components 4 are provided on both sides of the partition 3 along the axial direction of the cylinder 1. Since the fracturing assembly 5 is mounted on the partition 3, the position on the drive shaft 2 corresponding to the partition 3 experiences the greatest stress. Therefore, reinforcing assemblies 4 are installed on both sides of the partition 3 to enhance the stress resistance on the drive shaft 2. The reinforcing assemblies 4 should be installed as close to the partition 3 as possible without interfering with the movement of the fracturing assembly 5.

[0040] Specifically, refer to Figures 4 to 6 As shown, the fracturing axe 51 includes an axe head 511 and an axe handle 512. One end of the axe handle 512 is connected to the axe head 511, and the end of the axe head 511 opposite to the axe handle 512 forms an axe blade 513. The axe blade 513 is used to contact and fracture the rock stratum 100. The end of the axe handle 512 opposite to the axe head 511 is provided with an external thread 515, so that the axe handle 512 is threadedly connected to the slider 52 through the external thread 515. Correspondingly, the slider 52 is provided with an internal thread that mates with the external thread 515. In practical applications, the direction of the axe blade 513 is adjusted by rotating the fracturing axe 51. When the axe blade 513 is adjusted to a horizontal direction, it can fracture the rock stratum 100 to form a transverse crack 140; when the axe blade 513 is adjusted to a vertical direction, it can fracture the rock stratum 100 to form a longitudinal crack 130. The cracking axe 51 is provided with an air supply channel 514, which runs through the axe head 511 and the axe handle 512. One end of the air supply channel 514 is connected to the slider 52, and the other end (i.e. the outlet end) of the air supply channel 514 extends to the axe blade 513.

[0041] The fracturing device also includes a gas delivery assembly (not shown in the figure), which is used to supply high-pressure gas to the fracturing axe 51. The gas delivery assembly includes an air compressor and a gas delivery pipe. The air compressor generates high-pressure gas and is connected to the slider 52 via the gas delivery pipe, thereby connecting the air compressor to the gas delivery channel 514 in the fracturing axe 51. During fracturing, the axe blade 513 of the fracturing axe 51 fractures the rock layer 100 and creates a crack. Simultaneously, the axe blade 513 inserts into the crack. The gas delivery assembly supplies high-pressure gas into the gas delivery channel 514 to allow the high-pressure gas to further propagate the crack. In practical applications, before supplying high-pressure gas, an auxiliary cover plate can be used to seal the opening of the cylinder 1 to achieve a relative seal inside the cylinder 1.

[0042] Specifically, continue to refer to Figure 1 and Figure 5 As shown, there are multiple fracturing components 5, which are spaced apart along the circumferential direction of the drive shaft 2. By setting multiple fracturing components 5, fracturing can be performed at multiple positions in the circumferential direction of the mounting hole 110 to obtain multiple fractures. Multiple baffles 3 are set, which are spaced apart along the axial direction of the cylinder 1, and each baffle 3 is equipped with a fracturing component 5. In this embodiment, each baffle 3 is equipped with four fracturing components 5. This fracturing device can form fractures at multiple positions in the axial direction of the mounting hole 110, and can create multiple fractures on the same horizontal plane of the rock stratum 100. This allows for data acquisition of fractures at different depths in the rock stratum 100.

[0043] Specifically, the fracturing components 5 on all the baffles 3 are aligned with each other axially in the cylinder 1. When fracturing the longitudinal fracture 130, the fracturing components 5 located in the same position on multiple baffles 3 are aligned, and all the fracturing components 5 in the same position on multiple baffles 3 fracture the rock layer 100 to form a longitudinal fracture 130. It can also be understood that the length of the longitudinal fracture 130 extends along the depth direction of the mounting hole 110, and a single fracturing axe 51 cannot fracture to form a long longitudinal fracture 130. Therefore, aligning the fracturing components 5 located in the same position on each baffle 3 allows multiple fracturing axes 51 located in the same position to act simultaneously to form the longitudinal fracture 130.

[0044] like Figures 1 to 6 As shown, a rock fracturing construction method is also provided, which utilizes a fracturing device to conduct fracturing experiments on rock layer 100. Specifically, it includes the following steps:

[0045] Step S10: Drill a vertically downward mounting hole 110 in the rock stratum 100. The diameter of the mounting hole 110 is equal to or slightly larger than the diameter of the cylinder 1, so that the cylinder 1 can be inserted into the mounting hole 110 without significant shaking within it. Drill a positioning hole 120 at the bottom of the mounting hole 110, coaxial with the mounting hole 110. The shape of the positioning hole 120 matches the positioning part 13, so that the positioning part 13 can be inserted into the positioning hole 120. In this embodiment, the rock stratum 100 is the actual rock stratum in the oil and gas extraction area, and drilling operations are carried out in the area where experimental data collection is required.

[0046] Step S20: Install the fracturing device on the rock stratum 100. Insert the cylinder 1 into the mounting hole 110 and insert the positioning part 13 at the bottom of the cylinder 1 into the positioning hole 120.

[0047] Step S30: Secure the drive component to the outside of the mounting hole 110. The drive component can be pre-installed directly on the end plate 12 of the cylinder 1, or installed on the top surface of the rock stratum 100 using an external auxiliary tool. The output end of the drive component is connected and fixed to the drive shaft 2. The drive component drives the drive shaft 2 to descend, and the drive shaft 2 drives the fracturing axe 51 to move toward the periphery of the cylinder 1 via the connecting rod 53 and the slider 52. The fracturing axe 51 passes through the fracturing window 14 and abuts against the wall of the mounting hole 110, applying pressure to the rock stratum 100 to cause the rock stratum 100 to fracture and generate cracks.

[0048] In this embodiment, when experimental data for longitudinal fracture 130 needs to be collected, the fracturing axe 51 is rotated to adjust the axe blade 513 to a vertical direction during installation. During fracturing, multiple fracturing axes 51 in the same position apply pressure simultaneously to form longitudinal fracture 130. It should be noted that in practical applications, when multiple fracturing axes 51 located on the same straight line are installed at intervals in the depth direction of the mounting hole 110, the fracturing axes 51 fracture the rock layer 100 and form vertical cracks. As fracturing continues, the vertical cracks near the multiple fracturing axes 51 begin to extend and connect together to form an overall longitudinal fracture 130. Furthermore, when experimental data for transverse fracture 140 needs to be collected, the fracturing axe 51 is rotated to adjust the axe blade 513 to a horizontal direction during installation. During fracturing, multiple transverse fractures 140 are correspondingly formed by the fracturing components 5 located on the same partition 3. As fracturing continues, the transverse cracks 140 spread outwards, and multiple transverse cracks 140 located on the same horizontal plane can connect together.

[0049] Step S40: High-pressure gas is introduced into the air supply channel 514 of the fracturing axe 51 using the air supply assembly. The high-pressure gas is injected into the crack from the position of the axe blade 513 so that the interior of the transverse crack 140 or the longitudinal crack 130 diffuses.

[0050] In step S50, after the rock stratum 100 develops transverse cracks 130 or longitudinal cracks 140, the rock stratum 100 is tested using appropriate testing equipment to obtain the required experimental data.

[0051] Understandably, in this embodiment, the fracturing device is directly installed on the rock formation 100 for fracturing experiments, eliminating the need for sampling in the oil and gas extraction area and transferring samples to a laboratory, resulting in more accurate fracturing experiment data from the rock formation 100. By adjusting the direction of the fracturing axe 51, the conversion between transverse fractures 140 and longitudinal fractures 130 can be achieved, making it convenient and versatile. It eliminates the need to separately deploy fracturing devices for transverse fractures 140 and longitudinal fractures 130, thus reducing costs. Furthermore, the design of the fracturing axe 51 ensures that its blade 513 embeds into the fractures in the rock formation 100, preventing rapid fracture closure and providing ample time for experimental data acquisition.

[0052] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. An experimental rock fracturing device, characterized in that, include: A cylindrical body, wherein a baffle is provided inside the cylindrical body, the baffle is perpendicular to the axis of the cylindrical body, and a fracturing window is provided through the side wall of the cylindrical body; A drive shaft, which is coaxially disposed inside the cylinder; A fracturing assembly, comprising a fracturing axe, a slider, and a connecting rod, wherein the slider is slidably disposed on the partition plate, one end of the connecting rod is hinged to the drive shaft, and the other end is hinged to the slider, and the fracturing axe is detachably connected to the slider; A driving component is located outside the cylinder and is connected to one end of the driving shaft. The driving component is used to drive the driving shaft to move along the axial direction of the cylinder so as to drive the fracturing axe through the fracturing window toward the outside of the cylinder via the connecting rod and the slider. It also includes an air supply component. The end of the fracturing axe away from the slider is the axe blade. An air supply channel is provided inside the fracturing axe. The inlet end of the air supply channel is connected to the air supply component, and the outlet end of the air supply channel extends to the axe blade. The fracturing axe includes an axe head and an axe handle portion disposed on the axe head. The axe head forms the axe blade portion at one end away from the axe handle portion. The axe handle portion is threadedly connected to the slider. The air supply channel communicates with the slider. The air supply assembly includes an air compressor and an air supply pipe. The air compressor is communicated with the slider through the air supply pipe. There are multiple baffles, which are distributed at intervals along the axial direction of the cylinder, and each baffle is provided with a corresponding fracturing component; It also includes a reinforcing component, which includes a sleeve and a plurality of reinforcing rods. The sleeve is coaxially arranged with the cylinder body, and the plurality of reinforcing rods are spaced apart along the circumferential direction of the sleeve. The two ends of the reinforcing rods are respectively connected to the inner wall of the sleeve and the inner wall of the cylinder body. The reinforcing components are provided on both sides of the partition along the axial direction of the cylinder.

2. The experimental rock fracturing device according to claim 1, characterized in that, The fracturing assembly comprises multiple components, which are spaced apart along the circumferential direction of the drive shaft.

3. The experimental rock fracturing apparatus according to any one of claims 1 to 2, characterized in that, The cylinder includes a main body and a positioning part disposed at the bottom end of the main body. The drive shaft is disposed inside the main body, and the bottom end of the drive shaft is inserted into the positioning part.

4. The experimental rock fracturing device according to claim 3, characterized in that, A spring is provided inside the positioning part, and the drive shaft is elastically connected to the positioning part through the spring.

5. A method for hydraulic fracturing rock formations, characterized in that, Providing an experimental rock fracturing apparatus as described in any one of claims 1 to 4, comprising the following steps: Step S10: Drill an installation hole vertically downwards in the rock stratum, and drill a positioning hole at the bottom of the installation hole, the positioning hole being coaxial with the installation hole; Step S20: Insert the cylinder of the experimental rock fracturing device into the mounting hole, and insert the positioning part at the bottom of the cylinder into the positioning hole; Step S30: Fix the drive component to the outside of the mounting hole, and connect the output end of the drive component to the drive shaft of the experimental rock fracturing device. Use the drive component to drive the drive shaft down so that the fracturing axe passes through the cylinder and applies pressure to the hole wall of the mounting hole. When installing the fracturing axe, adjust the fracturing axe to a horizontal position to create transverse cracks in the rock strata; or, adjust the fracturing axe to a vertical position to create longitudinal cracks in the rock strata. Step S40: High-pressure gas is introduced into the gas supply channel of the fracturing axe using the gas supply assembly, and the high-pressure gas is used to diffuse into the transverse or longitudinal crack.

Images