Apparatus for producing a core by axial pressing and method for producing a laboratory core by axial pressing

Abstract

The application provides a device for making a core by axial pressing and a method for making a core by axial pressing in a laboratory. The device for making a core by axial pressing comprises a frame assembly having a containing space and at least two pushing holes coaxially arranged on opposite sides of the containing space; a mold assembly detachably arranged in the containing space, the mold assembly having a pressing deformation groove filled with core raw materials; a pressing oil cylinder arranged on the frame assembly and located in the containing space, at least a part of the pressing oil cylinder abutting against the mold assembly, the volume of the pressing deformation groove being changed during the extension and retraction of the pressing oil cylinder to press the core raw materials into a core; and a coring device arranged on the frame assembly and at least a part of the coring device being telescopically arranged in one of the pushing holes, the coring device being capable of extending into the pressing deformation groove and pushing the core out of the other pushing hole. The application solves the problems of high difficulty and high cost in making artificial cores in the prior art.

Description

Technical Field

[0001] This invention relates to the field of petroleum drilling experimental equipment technology, and more specifically, to an apparatus for axial compression core fabrication and a method for axial compression indoor core fabrication. Background Technology

[0002] Core physical simulation experiments are the basic theory for oil and gas reservoir evaluation and development. Physical simulation requires a large number of cores for repetitive experiments. However, due to the difficulty, small quantity, high cost and limited specifications of formation core sampling, it is difficult to meet the needs of experimental research. Therefore, it is necessary to find a model that can replace reservoir cores.

[0003] In China, artificial rock cores are commonly used for simulation experiments. Controlling the pore structure and manufacturing dimensions of artificial rock cores is crucial. Currently, the main artificial rock core manufacturing processes in China generally suffer from problems such as limited structural and functional capabilities and difficulty in controlling the porosity of the manufactured rock cores.

[0004] Patent CN205665078U discloses an artificial core fabrication mold and its mold segments, comprising at least two separately arranged mold segments. Adjacent mold segments are joined to form a mold cavity extending vertically along an axis. Each mold segment has a C-shaped cross-section. One of the joined mold segments has a first positioning structure on its mating end face, and the corresponding mating end face of the other mold segment has a second positioning structure for engaging with the first positioning structure. The mutually engaging first and second positioning structures ensure the radial positioning accuracy of the two mold segments when they are joined. Since each mold segment has a C-shaped cross-section and the positioning structure is located on the mating end face, the positioning structure is situated between the inner and outer circumferential surfaces of the mold segment, eliminating the need for outwardly protruding connecting ears on each mold segment. This design is complex, cumbersome to operate, and has a limited function, only capable of producing cores of a single specification. If multiple specifications of cores are required, multiple specifications of artificial core fabrication molds and mold segments are needed, resulting in extremely high manufacturing costs.

[0005] In other words, existing technologies for artificial rock cores present challenges in terms of production difficulty and cost. Summary of the Invention

[0006] The main objective of this invention is to provide an apparatus and method for axially compressed rock core production, in order to solve the problems of high difficulty and high cost in the production of artificial rock cores in the prior art.

[0007] To achieve the above objectives, according to one aspect of the present invention, an apparatus for axial compression core production is provided, comprising: a frame assembly having a receiving space and at least two push holes communicating with the receiving space, the two push holes being coaxially disposed on opposite sides of the receiving space; a mold assembly detachably disposed within the receiving space, the mold assembly having a compression deformation groove filled with core material; a compression cylinder disposed on the frame assembly and located within the receiving space, at least a portion of the compression cylinder abutting against the mold assembly, the compression cylinder changing the volume of the compression deformation groove during extension and retraction to compress the core material into a core; and a core sampling device disposed on the frame assembly, at least a portion of the core sampling device being retractably disposed within one push hole, the core sampling device being capable of extending into the compression deformation groove and ejecting the core through the other push hole.

[0008] Furthermore, the frame assembly includes: a frame body, which has a central through hole on one side surface and at least two connecting holes communicating with the central through hole; and a support frame, which is disposed within the central through hole and is fitted against the inner wall of the central through hole. The support frame has an accommodating space and at least two communicating holes communicating with the accommodating space, and the communicating holes and connecting holes are coaxial to form a pushing hole.

[0009] Furthermore, the support frame includes: a mold mounting plate, which is disposed at the top of the central through hole, and the mold assembly is connected to the mold mounting plate; a hydraulic cylinder mounting plate, which is disposed at the bottom of the central through hole, and the pressing hydraulic cylinder is connected to the hydraulic cylinder mounting plate; and two side support plates, which are spaced apart, with both ends of the side support plates connected to the mold mounting plate and the hydraulic cylinder mounting plate respectively to form an accommodating space, and the side support plates having connecting holes.

[0010] Furthermore, the mold assembly includes: a fixed mold, which is connected to the frame assembly, and has a receiving groove on the side of the fixed mold facing the pressing cylinder, the receiving groove extending through two opposite sides of the fixed mold; and a movable mold, which is movably disposed within the receiving groove, and has a notch on the side of the movable mold facing the bottom surface of the receiving groove, the notch and the receiving groove forming a pressing deformation groove, the pressing cylinder abutting against the movable mold to push the movable mold to move within the receiving groove, changing the distance between the notch and the bottom surface of the receiving groove, thereby pressing the core material into a core.

[0011] Furthermore, the mold assembly includes at least one bushing, which is detachably disposed within the pressing deformation groove, and the core material is disposed within the bushing. The pressing cylinder pushes the movable mold to press the bushing and thus press the core material into a core.

[0012] Furthermore, there are multiple bushings, each with a different diameter.

[0013] Furthermore, the diameter of the bushing is smaller than the diameter of the push hole.

[0014] Furthermore, the mold assembly also includes multiple adjusting bolts, and the side surface of the fixed mold facing the pressing cylinder has multiple adjusting holes. The multiple adjusting bolts are arranged corresponding to the multiple adjusting holes, and at least a portion of the adjusting bolts are located inside the side wall of the receiving groove to limit the movement of the mold.

[0015] Furthermore, the fixed mold also has at least two connecting flanges that extend outward from the two sides through which the receiving groove passes.

[0016] Furthermore, the axial compression core-making apparatus also includes at least two baffles, which are detachably disposed between the frame assembly and the mold assembly to block the push hole.

[0017] According to another aspect of the present invention, a method for producing rock cores by axial compression is provided. The method employs the aforementioned apparatus for producing rock cores by axial compression. The method includes: determining the required material ratio for the rock core to be produced and preparing it as the core raw material; determining the size of the rock core to be produced, selecting a suitable bushing according to the size, and placing the bushing into the compression deformation groove; determining the porosity of the rock core to be produced, and adjusting the position of the adjusting bolt according to the size and porosity; filling the bushing with the core raw material, activating the compression cylinder to push the bushing and form the rock core; after compression, removing the baffles at both ends of the mold assembly, and activating the core extraction device to push the rock core out from the push hole.

[0018] According to the technical solution of this invention, the axial compression core-making apparatus includes a frame assembly, a mold assembly, a pressing cylinder, and a core-taking device. The frame assembly has a receiving space and at least two pushing holes communicating with the receiving space, with the two pushing holes coaxially arranged on opposite sides of the receiving space. The mold assembly is detachably disposed within the receiving space and has a pressing deformation groove filled with core material. The pressing cylinder is disposed on the frame assembly and located within the receiving space, with at least a portion of the pressing cylinder abutting against the mold assembly. During the extension and retraction of the pressing cylinder, the volume of the pressing deformation groove is changed to press the core material into a core. The core-taking device is disposed on the frame assembly, with at least a portion of the core-taking device retractably disposed within one pushing hole. The core-taking device can extend into the pressing deformation groove and push the core out through the other pushing hole.

[0019] The frame assembly provides space for the mold assembly, pressing cylinder, and core sampling device. The mold assembly is the mold for making the core. During operation, the output shaft of the pressing cylinder can extend and retract vertically. As the output shaft extends, it gradually compresses the mold assembly, applying pressure to the core material within the compression deformation groove. As the output shaft retracts, the pressure on the mold assembly gradually decreases. This repeated compression process facilitates the shaping of the core material. The size of the compression deformation groove is variable to accommodate core materials of different volumes, thus producing cores of different sizes. This allows a single axial compression core-making device to produce cores of various sizes, effectively reducing the production cost of artificial cores. Furthermore, by controlling the pressing stroke of the pressing cylinder, the pressing force can be adjusted, thereby controlling the porosity of the core. After the hydraulic cylinder presses the core, the core extraction device is controlled to push the core out of the mold assembly without having to completely dismantle the axial compression core-making device. This facilitates quick core removal and reduces the difficulty of core production. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of the axial compression core-making apparatus is shown in an alternative embodiment of the present invention;

[0022] Figure 2 It shows Figure 1 A structural diagram of the mid-frame components;

[0023] Figure 3 A schematic diagram showing the positional relationship between the mold assembly and the baffle is provided.

[0024] The above figures include the following reference numerals:

[0025] 10. Frame assembly; 11. Accommodation space; 12. Push hole; 13. Frame body; 14. Central through hole; 15. Connecting hole; 16. Support frame; 161. Mold mounting plate; 162. Hydraulic cylinder mounting plate; 163. Side support plate; 17. Connecting hole; 20. Mold assembly; 21. Pressing deformation groove; 22. Fixed mold; 23. Accommodation groove; 24. Movable mold; 25. Notch; 26. Bushing; 27. Adjusting bolt; 28. Connecting flange; 30. Pressing cylinder; 40. Core extraction device; 50. Baffle. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0029] To address the problems of high difficulty and cost in manufacturing artificial rock cores in existing technologies, this invention provides an apparatus and method for manufacturing indoor rock cores using axial compression.

[0030] like Figures 1 to 3 As shown, the axial compression core-making apparatus includes a frame assembly 10, a mold assembly 20, a pressing cylinder 30, and a core-taking device 40. The frame assembly 10 has a receiving space 11 and at least two push holes 12 communicating with the receiving space 11. The two push holes 12 are coaxially arranged on opposite sides of the receiving space 11. The mold assembly 20 is detachably disposed within the receiving space 11 and has a pressing deformation groove 21 filled with core material. The pressing cylinder 30 is disposed on the frame assembly 10 and located within the receiving space 11. At least a portion of the pressing cylinder 30 abuts against the mold assembly 20. During the extension and retraction of the pressing cylinder 30, the volume of the pressing deformation groove 21 is changed to press the core material into a core. The core-taking device 40 is disposed on the frame assembly 10, and at least a portion of the core-taking device 40 is retractably disposed within one push hole 12. The core-taking device 40 can extend into the pressing deformation groove 21 and push the core out through the other push hole 12.

[0031] The frame assembly 10 provides space for the mold assembly 20, the pressing cylinder 30, and the core extraction device 40. The mold assembly 20 is the mold for making cores. During operation, the output shaft of the pressing cylinder 30 can extend and retract vertically. As the output shaft extends, it gradually compresses the mold assembly 20 to apply pressure to the core material within the pressing deformation groove 21. As the output shaft retracts, the pressure on the mold assembly 20 gradually decreases. This process of repeatedly pressing the core material facilitates the molding of the core. The size of the pressing deformation groove 21 is variable to accommodate core materials of different capacities, thereby producing cores of different sizes. This allows a single axial-pressure core-making device to produce cores of various sizes, effectively reducing the manufacturing cost of artificial cores. Furthermore, by controlling the pressing stroke of the pressing cylinder 30, the pressing force can be adjusted, thereby controlling the porosity of the core. After the pressing cylinder 30 presses the core, the core extraction device 40 is controlled to work so that the core extraction device 40 pushes the core out of the mold assembly 20 without having to completely dismantle the axial pressing core making device. This facilitates the quick removal of the core and reduces the difficulty of core making.

[0032] like Figure 1 and Figure 2 As shown, the frame assembly 10 includes a frame body 13 and a support frame 16. The frame body 13 has a central through hole 14 on one side surface and at least two connecting holes 15 communicating with the central through hole 14. The support frame 16 is disposed within the central through hole 14 and is fitted against the inner wall of the central through hole 14. The support frame 16 has a receiving space 11 and at least two connecting holes 17 communicating with the receiving space 11. The connecting holes 17 and the connecting holes 15 are coaxially arranged to form a pushing hole 12. The central through hole 14 on the frame body 13 facilitates the connection between the support frame 16 and the frame body 13, and also forms a receiving space 11 for accommodating the mold assembly 20 and the pressing cylinder 30. The support frame 16 is the basic component of the frame assembly 10, bearing the stress generated by other components during core pressing. The support frame 16 serves to strengthen the structural strength of the support frame 16 and provides an installation position for the mold assembly 20 and the pressing cylinder 30.

[0033] like Figure 1 and Figure 2As shown, the support frame 16 includes a mold mounting plate 161, a cylinder mounting plate 162, and two side support plates 163. The mold mounting plate 161 is located at the top of the central through hole 14, and the mold assembly 20 is connected to the mold mounting plate 161. The cylinder mounting plate 162 is located at the bottom of the central through hole 14, and the pressing cylinder 30 is connected to the cylinder mounting plate 162. The two side support plates 163 are spaced apart, and the two ends of the side support plates 163 are respectively connected to the mold mounting plate 161 and the cylinder mounting plate 162 to form an accommodating space 11. The side support plates 163 have connecting holes 17. The mold mounting plate 161 is used to mount the mold assembly 20, and the cylinder mounting plate 162 is used to mount the pressing cylinder 30. Furthermore, the mold mounting plate 161 is positioned at the top of the central through hole 14, so that the mold assembly 20 is positioned above it. When the pressing cylinder 30 retracts, the movable part of the mold assembly 20 moves downward under gravity, causing the size of the pressing deformation groove 21 to increase. When the pressing cylinder 30 extends, it pushes against the movable part of the mold assembly 20, at which point the size of the pressing deformation groove 21 decreases, compressing the core material. The repeated changes in the size of the pressing deformation groove 21 are beneficial for core pressing and shaping. The two side support plates 163 are mainly used to strengthen the structural strength of the frame body 13 and support the baffle 50 during core pressing.

[0034] Optionally, the central through hole 14 is square, and the support frame 16 is also square. The mold mounting plate 161, the cylinder mounting plate 162, and the two side support plates 163 are all flat, which facilitates the installation of the mold assembly 20 and the pressing cylinder 30.

[0035] like Figure 3 As shown, the mold assembly 20 includes a fixed mold 22 and a movable mold 24. The fixed mold 22 is connected to the frame assembly 10. The fixed mold 22 has a receiving groove 23 on the side facing the pressing cylinder 30, and the receiving groove 23 extends through the two opposite sides of the fixed mold 22. The movable mold 24 is movably disposed in the receiving groove 23. The movable mold 24 has a notch 25 on the side facing the bottom surface of the receiving groove 23. The notch 25 and the receiving groove 23 form a pressing deformation groove 21. The pressing cylinder 30 abuts against the movable mold 24 to push the movable mold 24 to move in the receiving groove 23, changing the distance between the notch 25 and the bottom surface of the receiving groove 23, thereby pressing the core material into a core. The pressing cylinder 30 cooperates with the movable mold 24 to change the position of the movable mold 24 in the receiving groove 23, thereby changing the distance between the notch 25 and the bottom surface of the receiving groove 23, so that the volume of the pressing deformation groove 21 changes. The change in the volume of the pressing deformation groove 21 is beneficial to pressing out rock cores of different diameters and porosities, effectively reducing the production cost of artificial rock cores.

[0036] like Figure 3As shown, the mold assembly 20 includes at least one bushing 26, which is detachably disposed within the pressing deformation groove 21. The core material is disposed within the bushing 26. The pressing cylinder 30 pushes the movable mold 24 to press the bushing 26, thereby pressing the core material into a core. The bushing 26 confines the core material within a space, reducing the looseness of the core material and improving the pressing efficiency of the core.

[0037] Optionally, there may be multiple bushings 26, each with a different diameter. Different bushings 26 can be used when producing cores of different diameters.

[0038] Specifically, the diameter of the bushing 26 is smaller than the diameter of the push hole 12. Setting the diameter of the bushing 26 to be smaller than the diameter of the push hole 12 facilitates the ejection of the bushing 26 and the core.

[0039] Specifically, one of the two push holes 12 is a push-in hole, at least a portion of the core-taking device 40 is telescopically disposed in a push-in hole, and the opposite of the push-in hole is a push-out hole, and the diameter of the bushing 26 is at least smaller than the diameter of the push-out hole.

[0040] like Figure 3 As shown, the mold assembly 20 also includes multiple adjusting bolts 27. The fixed mold 22 has multiple adjusting holes on its surface facing the pressing cylinder 30. The multiple adjusting bolts 27 are correspondingly arranged with the multiple adjusting holes, and at least a portion of the adjusting bolts 27 is located inside the sidewall of the receiving groove 23 to limit the movement of the movable mold 24. By controlling the extension length of the adjusting bolts 27 relative to the adjusting holes, the maximum stroke of the movable mold 24 is limited, thereby producing cores of different diameters and porosities.

[0041] like Figure 3 As shown, the fixed mold 22 also has at least two connecting flanges 28, which extend outward from the two sides through the receiving groove 23. The connecting flanges 28 in the fixed mold 22 facilitate the connection of the fixed mold 22 to the frame assembly 10.

[0042] like Figure 1 and Figure 3 As shown, the axial compression core-making apparatus also includes at least two baffles 50, which are detachably disposed between the frame assembly 10 and the mold assembly 20 to block the push hole 12. The baffles 50 are used to block the push hole 12 to form a closed space to facilitate core compression. When the core is removed, the baffles 50 are removed to expose the push hole 12, so that the core-retrieving device 40 can easily remove the core.

[0043] In addition, the fixed mold 22 is provided with a connecting flange 28 to provide an installation position for the baffle 50, so that the baffle 50 can be installed between the frame assembly 10 and the mold assembly 20.

[0044] The axial compression core fabrication method employs the aforementioned axial compression core fabrication apparatus. The method includes: determining the required material ratio for the core sample and preparing it as the core raw material; determining the size of the core sample and selecting a suitable bushing 26 based on the size, then placing the bushing 26 into the compression deformation groove 21; determining the porosity of the core sample and adjusting the position of the adjusting bolt 27 according to the size and porosity; filling the bushing 26 with the core raw material, activating the compression cylinder 30 to push the bushing 26 and form the core; after compression, removing the baffles 50 at both ends of the mold assembly 20, and activating the core extraction device 40 to push the core out through the push hole 12. The aforementioned axial compression core fabrication apparatus simplifies the operation of the method, allowing for the production of artificial core samples of various diameters and porosities, meeting the needs of most core simulation experiments, and enabling the rapid preparation of artificial core samples of various specifications.

[0045] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0046] 1. The axial compression core-making device in this application has a simple and reliable structure. The movable mold 24 can be matched with bushings 26 of different specifications to prepare artificial core samples of different diameters and porosities, which can replace reservoir cores for core physical simulation experiments. It has the advantages of simple operation and low production cost, and solves the problems of shortage, high cost and limited specifications of reservoir cores in indoor physical simulation experiments.

[0047] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for axial compression core fabrication, characterized in that, include: A frame assembly (10) having a receiving space (11) and at least two push holes (12) communicating with the receiving space (11), the two push holes (12) being coaxially arranged on opposite sides of the receiving space (11); A mold assembly (20) is detachably disposed within the receiving space (11), the mold assembly (20) having a pressing deformation groove (21) filled with core material; A pressing cylinder (30) is disposed on the frame assembly (10) and located in the receiving space (11). At least a portion of the pressing cylinder (30) abuts against the mold assembly (20). During the extension and retraction of the pressing cylinder (30), the volume of the pressing deformation groove (21) is changed to press the core material into a core. A core sampling device (40) is disposed on the frame assembly (10) and at least a portion of the core sampling device (40) is retractably disposed within one of the push holes (12). The core sampling device (40) is capable of extending into the compression deformation groove (21) and pushing the core through another push hole (12). The mold assembly (20) includes: A fixed mold (22) is connected to the frame assembly (10). The fixed mold (22) has a receiving groove (23) on the side facing the pressing cylinder (30). The receiving groove (23) extends through two opposite sides of the fixed mold (22). A movable mold (24) is movably disposed within the receiving groove (23). The movable mold (24) has a notch (25) on one side facing the bottom surface of the receiving groove (23). The notch (25) and the receiving groove (23) form the pressing deformation groove (21). The pressing cylinder (30) abuts against the movable mold (24) to push the movable mold (24) to move within the receiving groove (23), changing the distance between the notch (25) and the bottom surface of the receiving groove (23), thereby pressing the core material into a core.

2. The axial compression core-making apparatus according to claim 1, characterized in that, The framework component (10) includes: The frame body (13) has a central through hole (14) on one side surface and at least two connecting holes (15) communicating with the central through hole (14). A support frame (16) is disposed in the central through hole (14) and the support frame (16) is fitted to the inner wall surface of the central through hole (14). The support frame (16) has the accommodating space (11) and at least two connecting holes (17) communicating with the accommodating space (11). The connecting holes (17) and the connecting hole (15) are coaxially arranged to form the pushing hole (12).

3. The axial compression core-making apparatus according to claim 2, characterized in that, The support frame (16) includes: A mold mounting plate (161) is disposed on top of the central through hole (14), and the mold assembly (20) is connected to the mold mounting plate (161). A hydraulic cylinder mounting plate (162) is provided at the bottom of the central through hole (14), and the pressing hydraulic cylinder (30) is connected to the hydraulic cylinder mounting plate (162). Two side support plates (163) are spaced apart. The two ends of the side support plates (163) are respectively connected to the mold mounting plate (161) and the cylinder mounting plate (162) to form the accommodating space (11). The side support plates (163) have the communicating holes (17).

4. The apparatus for axial compression core fabrication according to claim 1, characterized in that, The mold assembly (20) includes at least one bushing (26), which is detachably disposed in the pressing deformation groove (21), and the core material is disposed in the bushing (26). The pressing cylinder (30) pushes the movable mold (24) to press the bushing (26) and thus press the core material into the core.

5. The apparatus for axial compression core fabrication according to claim 4, characterized in that, There are multiple bushings (26), and the diameters of the multiple bushings (26) are different.

6. The apparatus for axial compression core fabrication according to claim 4, characterized in that, The diameter of the bushing (26) is smaller than the diameter of the push hole (12).

7. The apparatus for axial compression core fabrication according to claim 1, characterized in that, The mold assembly (20) also includes a plurality of adjusting bolts (27). The fixed mold (22) has a plurality of adjusting holes on the side surface facing the pressing cylinder (30). The plurality of adjusting bolts (27) are arranged corresponding to the plurality of adjusting holes, and at least a portion of the adjusting bolts (27) is located inside the groove sidewall of the receiving groove (23) to limit the movement of the movable mold (24).

8. The apparatus for axial compression core fabrication according to claim 1, characterized in that, The fixed mold (22) also has at least two connecting flanges (28), which extend outward from the two sides through which the receiving groove (23) passes.

9. The apparatus for axial compression core preparation according to any one of claims 1 to 8, characterized in that, The axial compression core-making device further includes at least two baffles (50), which are detachably disposed between the frame assembly (10) and the mold assembly (20) to block the push hole (12).

10. A method for producing rock cores by axial compression, characterized in that, The method for producing cores by axial compression employs the apparatus for producing cores by axial compression as described in any one of claims 1 to 9, and the method for producing cores by axial compression includes: Determine the required material ratio for the core sample to be prepared, and mix them into core raw materials; Determine the size of the core to be processed, select a suitable bushing (26) according to the size, and place the bushing (26) into the compression deformation groove (21); Determine the porosity of the core sample to be prepared, and adjust the position of the adjusting bolt (27) according to the size and porosity; The core material is filled into the bushing (26), and the pressing cylinder (30) is activated to press the bushing (26) and form a core. After pressing, remove the baffles (50) at both ends of the mold assembly (20), and start the core extraction device (40) to push the core out from the push hole (12).

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