Experimental rock stratum fracturing device and rock stratum fracturing construction method

Abstract

The invention relates to a rock stratum fracturing device for an experiment and a rock stratum fracturing construction method. The rock stratum fracturing device for the experiment comprises a barrel, a driving shaft, a fracturing assembly and a driving part. A partition plate is arranged in the cylinder body, and a fracturing window is arranged on the side wall of the cylinder body. The driving shaft is coaxially arranged in the barrel. The fracturing assembly comprises a fracturing axe, a sliding block and a connecting rod, the sliding block is slidably arranged on the partition plate, one end of the connecting rod is hinged to the driving shaft, the other end of the connecting rod is hinged to the sliding block, and the fracturing axe is detachably connected with the sliding block. The driving part is connected with one end of the driving shaft and used for driving the driving shaft to move in the axis direction of the barrel so as to drive the fracturing axe to penetrate through the fracturing window to move towards the outside of the barrel. The barrel body is directly inserted into a rock stratum, and sampling on the rock stratum and transferring to a laboratory for a fracturing experiment are not needed. The front end of the fracturing axe is embedded into the crack, the crack is supported, the stability of the crack is improved, enough time is provided for measurement of experimental data, and the measured data are more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to an experimental rock formation fracturing device and a rock formation fracturing construction method. Background Art

[0002] Hydraulic fracturing is a mature technology in oil and gas extraction. Before oil and gas extraction begins, sampling and testing are typically performed on the rock formation in the extraction area to obtain various physical properties, which guide subsequent extraction operations. A common method for fracturing experiments involves transferring rock samples to a laboratory, performing fracturing tests on them using fracturing equipment, and measuring various experimental data. Due to the small size of the samples, their mechanical properties can differ significantly from those of the overall rock formation in the extraction area. Furthermore, the sample transfer process can easily lead to oil and gas loss. Consequently, the experimental data collected from the samples may deviate from the actual physical properties of the rock formation. The fracturing equipment commonly used in fracturing experiments primarily fractures the sample through direct compression. When the pressure is removed, the cracks formed in the sample close. Therefore, the window for collecting experimental data is limited and must be completed before the cracks close. Furthermore, this closure of the cracks can lead to inaccurate fracture morphology data. Summary of the Invention

[0003] The purpose of the present invention is to provide an experimental rock formation fracturing device and a rock formation fracturing construction method, wherein the cracks generated by the fracturing have strong stability and the accuracy of the experimental data is high.

[0004] To achieve this object, the present invention adopts the following technical solutions: An experimental rock fracturing device is provided, comprising: A cylinder, wherein a partition is provided in the cylinder, the partition is perpendicular to the axis of the cylinder, and a fracturing window is provided through the side wall of the cylinder; a drive shaft, the drive shaft being coaxially disposed within the cylinder; A fracturing assembly, the fracturing assembly comprising a fracturing axe, a slider and a connecting rod, the slider being slidably disposed on the partition, one end of the connecting rod being hinged to the drive shaft, and the other end being hinged to the slider, the fracturing axe being detachably connected to the slider; A driving member is located outside the cylinder, and the driving member is connected to one end of the driving shaft. The driving member 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 through the connecting rod and the slider.

[0005] Furthermore, it also includes a gas supply component, the end of the fracturing axe away from the slider is the axe blade, and a gas supply channel is provided in the fracturing axe. The inlet end of the gas supply channel is connected to the gas supply component, and the outlet end of the gas supply channel extends to the axe blade.

[0006] Furthermore, the fracturing axe includes an axe head and an axe handle portion arranged on the axe head, the end of the axe head facing away from the axe handle portion forms the axe blade portion, the axe handle portion is threadedly connected to the slider, the air supply channel is connected to the slider, and the air supply assembly includes an air compressor and an air supply pipe, and the air compressor is connected to the slider through the air supply pipe.

[0007] Furthermore, there are multiple fracturing assemblies, and the multiple fracturing assemblies are distributed at intervals along the circumferential direction of the drive shaft.

[0008] Furthermore, there are a plurality of partitions, which are spaced apart along the axial direction of the cylinder, and each of the partitions is correspondingly provided with the fracturing assembly.

[0009] Furthermore, it also includes a reinforcement component, which includes a sleeve and multiple reinforcement rods. The sleeve is coaxially arranged with the cylinder, and the multiple reinforcement rods are spaced apart along the circumferential direction of the sleeve. The two ends of the reinforcement rods are respectively connected to the sleeve and the inner wall of the cylinder.

[0010] Furthermore, along the axial direction of the cylinder, the reinforcement components are provided on both sides of the partition.

[0011] Furthermore, the cylinder includes a main body and a positioning portion arranged at the bottom end of the main body, the drive shaft is arranged in the main body, and the bottom end of the drive shaft is inserted into the positioning portion.

[0012] Furthermore, a spring is provided in the positioning portion, and the drive shaft is elastically connected to the positioning portion through the spring.

[0013] A rock fracturing construction method is also provided, and an experimental rock fracturing device is provided, comprising the following steps: Step S10: drilling a mounting hole vertically downward in the rock formation, and drilling a positioning hole at the bottom of the mounting hole, wherein the positioning hole is coaxial with the mounting hole; Step S20: inserting the barrel of the experimental rock fracturing device into the mounting hole, and inserting the positioning portion at the bottom of the barrel into the positioning hole; Step S30: Fixing a driving member outside the mounting hole, connecting an output end of the driving member to a driving shaft of the experimental rock fracturing device, and using the driving member to drive the driving shaft downward so that the fracturing axe passes through the barrel and applies pressure to the wall of the mounting hole; When installing the fracturing axe, the fracturing axe is adjusted to a horizontal direction to fracture the rock formation into a transverse crack; or the fracturing axe is adjusted to a vertical direction to fracture the rock formation into a longitudinal crack; Step S40: Use a gas delivery assembly to input high-pressure gas into the gas delivery channel of the fracturing axe, and use the high-pressure gas to diffuse the transverse cracks or the longitudinal cracks.

[0014] The present invention has the following advantages compared to the prior art: The present invention provides an experimental rock formation fracturing device and a rock formation fracturing construction method. By directly inserting a cylinder into the rock formation for fracturing, there is no need to take samples from the rock formation and transfer them to a laboratory for fracturing experiments. The experimental data collected on the rock formation have a smaller deviation from the physical properties of the overall rock formation, making the experimental data more accurate. During the fracturing process, the front end of the fracturing axe is embedded in the crack, providing support for the crack, improving the stability of the crack, and preventing the crack from closing after the pressure is removed. This provides sufficient time for measuring experimental data, and the crack morphology does not change, making the measured data more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of an experimental rock fracturing device according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of a cylinder according to an embodiment of the present invention installed in a rock formation.

[0017] Figure 3 Schematic diagram of a rock formation according to an embodiment of the present invention.

[0018] Figure 4 Schematic diagram of a fracturing axe according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of a fracturing assembly fracturing a longitudinal crack according to an embodiment of the present invention.

[0020] Figure 6 Schematic diagram of a fracturing assembly fracturing a transverse crack according to an embodiment of the present invention.

[0021] In the figure: 1. Cylinder; 11. Main body; 12. End plate; 13. Positioning part; 14. Fracturing window; 15. Spring; 2. Drive shaft; 3. Partition; 31. Connecting hole; 4. Reinforcement assembly; 41. Sleeve; 42. Reinforcement rod; 5. Fracturing assembly; 51. Fracturing axe; 511. Axe head; 512. Axe handle; 513. Axe blade; 514. Gas transmission channel; 515. External thread; 52. Slider; 53. Connecting rod; 100. Rock formation; 110. Mounting hole; 120. Positioning hole; 130. Longitudinal crack; 140. Transverse crack. DETAILED DESCRIPTION

[0022] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] like Figures 1 to 6 As shown, the present invention provides an experimental rock formation fracturing device (hereinafter referred to as the fracturing device), which is used to conduct fracturing experiments on a rock formation 100 to form transverse cracks 140 and longitudinal cracks 130 on the rock formation 100 for experimental analysis. The fracturing device includes a barrel 1, a drive shaft 2, a fracturing assembly 5, and a drive member (not shown in the figure). The barrel 1 serves as an integral support, providing installation space for the drive shaft 2 and the fracturing assembly 5. The fracturing assembly 5 is the direct actuator of the fracturing process, utilizing mutual compression between the fracturing assembly 5 and the rock formation 100 to form transverse cracks 140 or longitudinal cracks 130. The drive shaft 2 serves as a power transmission function, and the drive member is used to provide power. The fracturing assembly 5 and the drive member are connected by a transmission connection via the drive shaft 2, so that the power output by the drive member can be transmitted to the fracturing assembly 5 via the drive shaft 2.

[0024] The cylinder 1 is a hollow cylindrical structure, and a partition 3 is provided 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 so that the inside and outside of the cylinder 1 are connected through the fracturing window 14. 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 formation 100 outside the cylinder 1. The drive shaft 2 is provided in the cylinder 1, and the drive shaft 2 is coaxial with the cylinder 1. Correspondingly, a connecting hole 31 for passing the drive shaft 2 is provided on the partition 3, and the drive shaft 2 is passed 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 provided on the partition 3, and the sliding direction of the slider 52 is the radial direction of 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 toward the periphery of the cylinder 1. The overall shape of the fracturing axe 51 is similar to that of an axe in the prior art, and the axe blade 513 at its front end is used to fracture the rock formation 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 member is a hydraulic cylinder or a jack. In this embodiment, the driving member adopts a jack to facilitate field installation and use. The driving member is installed on the outside of the cylinder 1, and the output end of the driving member 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 member 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. Under the driving action of the driving shaft 2, the fracturing axe 51 passes through the fracturing window 14 and moves toward the outside of the barrel 1. The fracturing axe 51 contacts the rock formation 100 and applies pressure to generate cracks in the rock formation 100.

[0025] It is understandable that when the fracturing device is conducting a fracturing experiment, the barrel 1 is directly inserted into the rock formation 100, and then the driving shaft 2 is driven downward by the driving member, and the fracturing axe 51 can be used to fracture the rock formation 100 to generate cracks. There is no need to take samples from the rock formation 100 and transfer the samples to the laboratory for fracturing experiments, which avoids the loss of oil and gas during the transfer process, making the experimental data more accurate. In addition, during the fracturing process, the fracturing axe 51 moves toward the rock formation 100, and when cracks are generated in the rock formation 100, the front end of the fracturing axe 51 will be inserted into the cracks. This structure is conducive to maintaining the cracks on the rock formation 100, avoiding the closure of the cracks after the pressure is lost, providing sufficient time for the data collection work of the physical properties of the cracks, and making the data collection of the physical properties of the cracks more accurate.

[0026] Specifically, refer to Figure 1 and Figure 3As shown, the cylinder 1 includes a main body 11, an end plate 12, and a positioning portion 13. The main body 11 is a hollow cylindrical structure with an opening formed at the top. The drive shaft 2, partition plate 3, and fracturing assembly 5 are all installed within the main body 11. The end plate 12 is disposed at the top of the main body 11 and has a circular ring structure. The inner ring side of the end plate 12 is connected to the periphery of the main body 11, and the outer ring side of the end plate 12 extends away from the main body 11. The positioning portion 13 is disposed at the bottom end of the main body 11, and the bottom end of the drive shaft 2 is inserted into the positioning portion 13. Correspondingly, a mounting hole 110 for mounting the fracturing device is provided in the rock formation 100. The shape of the mounting hole 110 matches the shape of the cylinder 1. A positioning hole 120 for mounting the positioning portion 13 is provided at the bottom of the mounting hole 110. The positioning hole 120 is coaxial with the mounting hole 110 and has a smaller diameter than the mounting hole 110. The positioning portion 13 is inserted into the positioning hole 120. It can be understood that since the positioning portion 13 is inserted into the positioning hole 120, the drive shaft 2 is inserted into the positioning portion 13 to achieve the positioning of the drive shaft 2 so that the drive shaft 2 is located at the center of the mounting hole 110 of the rock formation 100. At the same time, the bottom end of the drive shaft 2 is fixed by the positioning hole 120 to prevent the drive shaft 2 from being displaced 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 formation 100, and the end plate 12 can be used to bear the downward force of the entire fracturing device. Of course, the drive member can also be installed on the end plate 12 to transmit the reaction force generated when the drive member presses down the drive shaft 2 to the end plate 12.

[0027] The positioning portion 13 is a hollow cylindrical structure, with one end of the positioning portion 13 located inside the cylinder 1 and the other end protruding from the bottom surface of the cylinder 1. A spring 15 is provided in the positioning portion 13, and the drive shaft 2 is inserted into the positioning portion 13, and the drive shaft 2 is elastically connected to the positioning portion 13 through the spring 15. It can be understood that during fracturing, the fracturing axe 51 will pass through the fracturing window 14 and be partially embedded in the rock formation 100. At this time, the cylinder 1 cannot be removed upward from the mounting hole 110. By providing the spring 15, the spring 15 is compressed when the drive shaft 2 moves downward. After the fracturing is completed, the driving member removes the downward pressure, and the spring 15 can drive the drive shaft 2 to rise back to the initial position, thereby allowing the fracturing axe 51 to retreat into the cylinder 1 so that the cylinder 1 can be removed from the mounting hole 110.

[0028] The fracturing device also includes a reinforcement assembly 4, which serves to reinforce the overall structure of the fracturing device. The reinforcement assembly 4 includes a sleeve 41 and multiple reinforcement rods 42. The sleeve 41 is coaxially arranged with the cylinder body 1, and the drive shaft 2 is inserted into the sleeve 41 and can slide up and down within the sleeve 41. The multiple reinforcement rods 42 are spaced apart along the circumference of the sleeve 41, and the ends of the reinforcement rods 42 are respectively connected and fixed to the sleeve 41 and the inner wall of the cylinder body 1. It can be understood that during fracturing, the reaction force generated by the fracturing axe 51 acts on the drive shaft 2 in the radial direction of the cylinder body 1. By providing the reinforcement assembly 4 within the cylinder body 1, the force applied to the drive shaft 2 is strengthened. During fracturing, the reaction force of the fracturing axe 51 can be distributed to the cylinder body 1 through the reinforcement assembly 4, preventing the drive shaft 2 from bending and deforming due to excessive local force. The reinforcement assembly 4 is provided on both sides of the partition 3 along the axis of the cylinder body 1. Because the fracturing assembly 5 is mounted on the partition 3, the location on the drive shaft 2 corresponding to the partition 3 experiences the greatest force. Therefore, reinforcement assemblies 4 are installed on both sides of the partition 3 to enhance the force applied to the drive shaft 2. Reinforcement assemblies 4 should be installed as close to the partition 3 as possible without interfering with the movement of the fracturing assembly 5.

[0029] Specifically, refer to Figures 4 to 6 As shown, the fracturing axe 51 includes an axe head 511 and a handle 512. One end of the handle 512 is connected to the axe head 511, and the end of the axe head 511 facing away from the handle 512 forms an axe blade 513. The axe blade 513 is used to contact and fracture the rock formation 100. The end of the axe handle 512 facing away from the axe head 511 is provided with external threads 515, which allow the handle 512 to be threadedly connected to the slider 52. Correspondingly, the slider 52 is provided with internal threads that mate with the external threads 515. In actual use, the direction of the axe blade 513 is adjusted by rotating the fracturing axe 511. When the axe blade 513 is adjusted to a horizontal orientation, it can fracture the rock formation 100 to form a transverse crack 140. When the axe blade 513 is adjusted to a vertical orientation, it can fracture the rock formation 100 to form a longitudinal crack 130. The fracturing axe 51 is provided with an air supply channel 514 which passes 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.

[0030] The fracturing device also includes a gas supply assembly (not shown) for supplying high-pressure gas to the fracturing axe 51. The gas supply assembly includes an air compressor and a gas supply pipe. The air compressor is used to generate high-pressure gas. The air compressor is connected to the slider 52 via the gas supply pipe, which in turn connects the air compressor to the gas supply channel 514 in the fracturing axe 51. During fracturing, the axe blade 513 of the fracturing axe 51 fractures the rock formation 100 and creates cracks. Simultaneously, the axe blade 513 is inserted into the cracks. The gas supply assembly supplies high-pressure gas into the gas supply channel 514, using the high-pressure gas to further expand the cracks. In actual use, before supplying high-pressure gas, the opening of the cylinder 1 can be sealed with an auxiliary cover plate to ensure a relatively sealed interior of the cylinder 1.

[0031] Specifically, continue to refer to Figure 1 and Figure 5 As shown, there are multiple fracturing assemblies 5, and the multiple fracturing assemblies 5 are spaced apart along the circumferential direction of the drive shaft 2. By providing multiple fracturing assemblies 5, fracturing can be performed at multiple positions in the circumferential direction of the mounting hole 110 to obtain multiple cracks. There are multiple partitions 3, and the multiple partitions 3 are spaced apart along the axial direction of the cylinder 1, and each partition 3 is provided with a fracturing assembly 5. In this embodiment, four fracturing assemblies 5 are provided on each partition 3. The fracturing device can form cracks at multiple positions in the axial direction of the mounting hole 110, and can form multiple cracks on the rock formation 100 on the same horizontal plane. This enables data collection of cracks on the rock formation 100 at different depths.

[0032] Specifically, the fracturing assemblies 5 on all the partitions 3 are aligned with each other in the axial direction of the cylinder 1. When fracturing the longitudinal crack 130, the fracturing assemblies 5 located in the same position on multiple partitions 3 are aligned. After all the fracturing assemblies 5 in the same position on multiple partitions 3 fracture the rock formation 100, a longitudinal crack 130 is formed. It can also be understood that the length of the longitudinal crack 130 extends along the depth direction of the mounting hole 110, and a single fracturing axe 51 cannot fracture and form a longer longitudinal crack 130. Therefore, the fracturing assemblies 5 located in the same position on each partition 3 are aligned, so that multiple fracturing axes 51 located in the same position act simultaneously to form the longitudinal crack 130.

[0033] like Figures 1 to 6 As shown, a rock formation fracturing construction method is also provided, which uses a fracturing device to perform a fracturing experiment on the rock formation 100. Specifically, the following steps are included: Step S10: Drill a mounting hole 110 vertically downward in the rock formation 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 and the cylinder 1 does not shake significantly in the mounting hole 110. Drill a positioning hole 120 at the bottom of the mounting hole 110. The positioning hole 120 is coaxial with the mounting hole 110. The shape of the positioning hole 120 matches the positioning portion 13, so that the positioning portion 13 can be inserted into the positioning hole 120. In this embodiment, the rock formation 100 is a field rock formation in an oil and gas production area, and the drilling operation is performed in an area where experimental data collection is required.

[0034] Step S20 : ​​Install the fracturing device on the rock formation 100 . Insert the barrel 1 into the installation hole 110 , and insert the positioning portion 13 at the bottom of the barrel 1 into the positioning hole 120 .

[0035] Step S30, fix the driving member on the outside of the mounting hole 110. The driving member can be directly installed on the end plate 12 of the cylinder 1 in advance, or installed on the top surface of the rock formation 100 through an external auxiliary tool. The output end of the driving member is connected and fixed to the driving shaft 2. The driving member drives the driving shaft 2 to descend, and the driving shaft 2 drives the fracturing axe 51 to move toward the periphery of the cylinder 1 through 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. The fracturing axe 51 applies pressure to the rock formation 100 to break the rock formation 100 and produce cracks.

[0036] In this embodiment, when it is necessary to collect experimental data on longitudinal cracks 130, the axe 51 is rotated during installation to adjust the axe blade 513 to a vertical orientation. During fracturing, multiple fracturing axes 51 in the same orientation simultaneously apply pressure to form longitudinal cracks 130. It should be noted that in actual applications, when multiple fracturing axes 51 are installed in a straight line at intervals in the depth direction of the mounting hole 110, the fracturing axes 51 fracture the rock formation 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 a unified longitudinal crack 130. Furthermore, when it is necessary to collect experimental data on transverse cracks 140, the axe 51 is rotated during installation to adjust the axe blade 513 to a horizontal orientation. During fracturing, multiple transverse cracks 140 are correspondingly formed in the fracturing assembly 5 located on the same partition 3. As the fracturing continues, the transverse cracks 140 spread outward, and multiple transverse cracks 140 located on the same horizontal plane can be connected together.

[0037] Step S40 , using the gas delivery assembly to input high-pressure gas into the gas delivery channel 514 of the fracturing axe 51 , and the high-pressure gas is sprayed into the crack from the position of the axe blade 513 to diffuse the inside of the transverse crack 140 or the longitudinal crack 130 .

[0038] In step S50 , after the transverse cracks 130 or the longitudinal cracks 140 are generated in the rock stratum 100 , the rock stratum 100 is tested by corresponding testing equipment to obtain required experimental data.

[0039] It is understood that in this embodiment, the fracturing device is directly installed on the rock formation 100 to conduct the fracturing experiment. There is no need to take samples in the oil and gas production area and transfer the samples to the laboratory. The fracturing experimental data of the rock formation 100 is more accurate. By adjusting the direction of the fracturing axe 51, the conversion between the transverse cracks 140 and the longitudinal cracks 130 can be achieved. It is easy to use and has strong versatility. There is no need to arrange corresponding fracturing devices for the transverse cracks 140 and the longitudinal cracks 130 respectively, which is conducive to reducing costs. In addition, through the design of the fracturing axe 51, the axe blade 513 of the fracturing axe 51 will be embedded in the cracks of the rock formation 100, avoiding the rapid closure of the cracks and providing sufficient time for experimental data collection.

[0040] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. An experimental rock fracturing device, characterized in that: include: A cylinder, wherein a partition is provided in the cylinder, the partition is perpendicular to the axis of the cylinder, and a fracturing window is provided through the side wall of the cylinder; a drive shaft, the drive shaft being coaxially disposed within the cylinder; A fracturing assembly, the fracturing assembly comprising a fracturing axe, a slider and a connecting rod, the slider being slidably disposed on the partition, one end of the connecting rod being hinged to the drive shaft, and the other end being hinged to the slider, the fracturing axe being detachably connected to the slider; A driving member is located outside the cylinder, and the driving member is connected to one end of the driving shaft. The driving member 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 through the connecting rod and the slider.

2. The experimental rock fracturing device according to claim 1, characterized in that: It also includes a gas delivery component. The end of the fracturing axe facing away from the slider is the axe blade. A gas delivery channel is provided in the fracturing axe. The inlet end of the gas delivery channel is connected to the gas delivery component, and the outlet end of the gas delivery channel extends to the axe blade.

3. The experimental rock fracturing device according to claim 2, characterized in that: The fracturing axe includes an axe head and an axe handle portion arranged on the axe head, the end of the axe head facing away from the axe handle portion forms the axe blade portion, the axe handle portion is threadedly connected to the slider, the air supply channel is connected to the slider, and the air supply component includes an air compressor and an air supply pipe, and the air compressor is connected to the slider through the air supply pipe.

4. The experimental rock fracturing device according to claim 1, characterized in that: There are multiple fracturing assemblies, and the multiple fracturing assemblies are distributed at intervals along the circumferential direction of the driving shaft.

5. The experimental rock fracturing device according to claim 1, characterized in that: There are a plurality of partitions, which are spaced apart and distributed along the axial direction of the cylinder, and each of the partitions is correspondingly provided with the fracturing assembly.

6. The experimental rock fracturing device according to claim 1, characterized in that: It also includes a reinforcement component, which includes a sleeve and multiple reinforcement rods. The sleeve is coaxially arranged with the cylinder body, and the multiple reinforcement rods are spaced apart along the circumferential direction of the sleeve. The two ends of the reinforcement rods are respectively connected to the sleeve and the inner wall of the cylinder body.

7. The experimental rock fracturing device according to claim 6, characterized in that: Along the axial direction of the cylinder, the reinforcement components are provided on both sides of the partition.

8. The experimental rock fracturing device according to any one of claims 1 to 7, characterized in that: The cylinder includes a main body and a positioning portion arranged at the bottom end of the main body. The drive shaft is arranged in the main body, and the bottom end of the drive shaft is inserted into the positioning portion.

9. The experimental rock fracturing device according to claim 8, characterized in that: A spring is provided in the positioning portion, and the driving shaft is elastically connected to the positioning portion through the spring.

10. A rock formation fracturing construction method, characterized in that: An experimental rock fracturing device according to any one of claims 1 to 9 is provided, comprising the following steps: Step S10: drilling a mounting hole vertically downward in the rock formation, and drilling a positioning hole at the bottom of the mounting hole, wherein the positioning hole is coaxial with the mounting hole; Step S20: inserting the barrel of the experimental rock fracturing device into the mounting hole, and inserting the positioning portion at the bottom of the barrel into the positioning hole; Step S30: Fixing a driving member outside the mounting hole, connecting an output end of the driving member to a driving shaft of the experimental rock fracturing device, and using the driving member to drive the driving shaft downward so that the fracturing axe passes through the barrel and applies pressure to the wall of the mounting hole; When installing the fracturing axe, the fracturing axe is adjusted to a horizontal direction to fracture the rock formation into a transverse crack; or the fracturing axe is adjusted to a vertical direction to fracture the rock formation into a longitudinal crack; Step S40: Use a gas delivery assembly to input high-pressure gas into the gas delivery channel of the fracturing axe, and use the high-pressure gas to diffuse the transverse cracks or the longitudinal cracks.

Images