Core catch

Abstract

The application discloses a core discharging and connecting device, which comprises a base cylinder, a first cleaning valve, a first variable-diameter arc plate and a cover. The base cylinder is used for accommodating a core, and the bottom end of the base cylinder is provided with a bottom plate and the top end is open. The bottom plate is provided with a slurry discharging port. The first cleaning valve is fixed to the base cylinder and close to the top end of the base cylinder. The first variable-diameter arc plate is movably installed in the base cylinder along a preset direction and is used for tightly abutting against the outer wall of the core to prevent the core from shaking in the base cylinder. The cover can be fixed to the top end of the base cylinder and close the top end opening of the base cylinder. In the core discharging and connecting device, the base cylinder can accommodate the core taken out by a drilling device, and the first variable-diameter arc plate is arranged in the base cylinder and can tightly abut against the core to fix the core, so that the manual core taking is avoided, and the safety hidden danger caused by the manual core taking to the workers is eliminated.

Description

Technical Field

[0001] This invention relates to the field of petroleum exploration technology, and more specifically, to a core extraction and connection device. Background Technology

[0002] In the process of oil drilling and exploration, core samples are the direct physical data for obtaining information such as the physical properties of the oil reservoir, the oil, gas and water content of the reservoir, and the development effect of the oil field. Since there is no way to repair a damaged core sample, the core extraction process is particularly important.

[0003] Currently, the core sampling process typically involves: ① annular fracturing of the bottom rock to form a core; ② core protection: during drilling, the formed core must be protected to prevent erosion by circulating drilling fluid and mechanical damage from drill string rotation; ③ core retrieval: after drilling to a certain length, the core is cut off at the bottom and clamped, then lifted to the surface with the drill string during tripping. Once the core is on the surface, the core retrieval and reconnection process begins. In most cases, workers manually retrieve the core and arrange it in a core box. However, manually retrieving the core poses safety hazards to the workers.

[0004] In addition, manual core joining can easily cause uneven stress on the core, leading to breakage and making it difficult to join the joints, thus reducing the long-term preservation effect of the core.

[0005] In summary, how to avoid manual core handling and eliminate safety hazards for workers is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a core extraction and connection device, wherein the base cylinder is capable of holding the core extracted by the drilling device, and the base cylinder is provided with a first variable diameter arc plate, which can fit tightly against the core to fix the core and avoid the safety hazards to workers from manual core connection.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A core extraction and connection device, comprising:

[0009] The base cylinder has a slurry outlet on its bottom plate and an opening at its top; the base cylinder is used to receive the rock core.

[0010] A first cleaning valve is fixed to the base cylinder and close to the top of the base cylinder;

[0011] The first variable diameter arc plate is movable in a preset direction and installed inside the base cylinder to fit tightly against the outer wall of the core.

[0012] A cap is provided, which is fixed to the top of the base tube and closes the top opening of the base tube.

[0013] Preferably, the above-mentioned core outlet and core connection device further includes a filter plate, which is arranged on the bottom plate and has a gap with the bottom plate.

[0014] Preferably, in the above-mentioned core feeding and receiving device, the slurry tray has a plurality of protrusions supporting the bottom plate on one side facing the bottom plate, and each of the protrusions is arranged circumferentially along the slurry tray; the outer periphery of the slurry tray has a plurality of slurry discharge notches.

[0015] Preferably, in the above-mentioned core outlet and core connection device, the outer wall of the base cylinder is provided with multiple handles.

[0016] Preferably, in the above-mentioned core outlet and core connection device, the first cleaning valve includes:

[0017] A tangential tube is fixed to the first mounting hole of the base cylinder, and the outlet end of the tangential tube communicates with the interior of the base cylinder.

[0018] A connecting cap, the first end of which is threaded to the inlet end of the tangential pipe, and the second end of which is provided with a plug.

[0019] Preferably, in the above-mentioned core outlet and core connection device, the first variable diameter arc plate is movably installed on the base cylinder via a variable diameter adjustment valve; the variable diameter adjustment valve includes:

[0020] A prism is inserted into a second mounting hole in the base cylinder, which is movably inserted along the radial direction of the base cylinder; one end of the prism is fixedly connected to the first variable diameter arc plate.

[0021] A support frame, which is fixed to the outer wall of the base cylinder;

[0022] A lead screw is installed on the support frame by means of a threaded connection, and one end of the lead screw is rotatably fitted into the prism around its own axis.

[0023] Preferably, the above-mentioned core extraction and connection device further includes a core straightening assembly, which includes:

[0024] A straightening wire tube is fixed to the base cylinder, and the straightening wire tube is a hollow inner wire tube;

[0025] A screw, which is threaded into the straightening wire tube and is used to extend into the base cylinder to straighten the rock core.

[0026] Preferably, the above-mentioned core outlet and core connection device further includes:

[0027] An extension tube is provided, with openings at both ends, and is used to fix the base tube to lengthen the base tube; the extension tube is provided with a second variable diameter arc plate and a second cleaning valve.

[0028] Preferably, in the above-mentioned core feeding and connecting device, the top end of the base cylinder is provided with a first connecting cylinder, the first connecting cylinder is coaxial with the base cylinder, and the aperture of the first connecting cylinder is larger than the aperture of the base cylinder; the lower end of the extension cylinder is inserted into the first connecting cylinder and abuts against the base cylinder; the cap is used to fix the upper end of the base cylinder and block the upper opening of the extension cylinder.

[0029] Preferably, in the above-mentioned core output and connection device, the top end of the extension cylinder is connected to a second connecting cylinder, the second connecting cylinder is coaxial with the extension cylinder, and the aperture of the second connecting cylinder is larger than the aperture of the extension cylinder;

[0030] The outer periphery of the first connecting cylinder and the second connecting cylinder are respectively fixed with connecting hoops that fit into the connecting rod, and wing nuts are respectively installed at both ends of the connecting rod.

[0031] This invention provides a core receiving device, comprising a base cylinder, a first cleaning valve, a first variable-diameter arc plate, and a cap; the base cylinder is used to receive the core, and the bottom end of the base cylinder is provided with a bottom plate and the top end has an opening; the bottom plate has a slurry outlet; the first cleaning valve is fixed to the base cylinder and close to the top end of the base cylinder; the first variable-diameter arc plate is movable in the base cylinder in a preset direction and is used to fit tightly against the outer wall of the core to prevent the core from shaking inside the base cylinder; the cap is fixed to the top end of the base cylinder and closes the top end opening of the base cylinder.

[0032] In the core extraction and connection device provided by the present invention, the base cylinder can hold the core extracted by the drilling device, and the base cylinder is provided with a first variable diameter arc plate, which can fit tightly against the core to fix the core, avoid manual connection of the core, and eliminate the safety hazards caused to workers by manual connection of the core.

[0033] In addition, the core ejection and core connection device provided by the present invention is equipped with a first variable diameter arc plate, which can clamp the core from the side, so as to reliably fix the core and reduce the risk of breakage due to uneven force during the core ejection and core connection process.

[0034] Furthermore, the core feeding and receiving device is equipped with a cap, which can preserve the core for a long time. Even if the core breaks, the entire core is reliably fixed by the first variable diameter arc plate, which can ensure that the broken ends of the core are always tightly sealed, thus ensuring the long-term preservation of the core. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 An exploded view of the core extraction and connection device provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the filter disc provided in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of the first cleaning valve provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the connecting disk provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the assembly of the prism and the lead screw provided in an embodiment of the present invention;

[0041] Figure 6 An assembly drawing of the connecting rod and the wing nut provided in an embodiment of the present invention;

[0042] Figure 7 This is an assembly drawing of the variable diameter adjusting valve, the base cylinder, and the first variable diameter arc plate provided in an embodiment of the present invention;

[0043] in, Figures 1-7 middle:

[0044] 1. Base cylinder; 2. Variable diameter adjusting valve; 3. First variable diameter arc plate; 4. Support leg; 5. End lug; 6. Lifting lug; 7. Filter plate; 8. Slurry outlet; 9. Base plate; 10. First cleaning valve; 11. Sleeve; 12. Connecting hoop; 13. Extension cylinder; 14. Tangential tube; 15. Cover; 16. Tightening cap; 17. Protrusion; 18. Slurry outlet notch; 19. Cylinder wall; 20. Rotating cylinder; 21. Prism; 22. Support frame; 23. Screw rod; 24. Fixing screw cap; 25. Rotating hole; 26. Rotating handle; 27. Inner thread ring; 28. Connecting cap; 29. ​​Protrusion; 30. Sealing; 31. Connecting plate; 32. Top cavity; 33. Rotating cylinder cavity; 34. Bottom cavity; 35. Connecting rod; 36. Wing nut; 37. Straightening thread tube. Detailed Implementation

[0045] This invention discloses a core extraction and connection device, whose base cylinder can hold the core extracted by the drilling device, and the base cylinder is provided with a first variable diameter arc plate, which can fit tightly against the core to fix the core and avoid the safety hazards to workers from manual core connection.

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Please see Figure 1-7 This invention provides a core receiving device, comprising a base cylinder 1, a first cleaning valve 10, a first variable-diameter arc plate 3, and a cap 15. The base cylinder 1 is used to receive the core, and its bottom end is provided with a bottom plate 9 and a top opening. The bottom plate 9 has a slurry outlet 8. The first cleaning valve 10 is fixed to the base cylinder 1 and close to the top end of the base cylinder 1. The first variable-diameter arc plate 3 is movably installed inside the base cylinder 1 in a preset direction to fit tightly against the outer wall of the core to prevent the core from shaking inside the base cylinder 1. The cap 15 is fixed to the top end of the base cylinder 1 and closes the top opening of the base cylinder 1. The preset direction is the radial direction of the base cylinder 1.

[0048] In the core feeding and receiving device provided in this embodiment of the invention, the base cylinder 1 can hold the core extracted by the drilling device, and the base cylinder 1 is provided with a first variable diameter arc plate 3, which can fit tightly against the core to fix the core, avoid manual core feeding, and eliminate the safety hazards caused to workers by manual core feeding.

[0049] In addition, the core ejection and core connection device provided in this embodiment of the invention is provided with a first variable diameter arc plate 3, which can clamp the core from the side, so as to reliably fix the core and reduce the risk of breakage due to uneven force during the core ejection and core connection process.

[0050] Furthermore, the core feeding and receiving device can preserve the core for a long time. Even if the core breaks, the entire core is reliably fixed by the first variable diameter arc plate 3, which ensures that the broken ends of the core are always tightly pressed together, thus guaranteeing the long-term preservation of the core.

[0051] Meanwhile, in the core feeding and connecting device provided in this embodiment, the base cylinder 1 is equipped with a first cleaning valve 10, which can provide cleaning water to the base cylinder 1. The cleaned mud can flow out through the slurry outlet 8, thereby cleaning the inside of the base cylinder 1.

[0052] The base cylinder 1 has three supporting legs 4 on its outer periphery at the bottom. Specifically, each supporting leg 4 is a triangular steel plate with a right-angled side length of 80mm × 100mm × wall thickness of 3mm. The bottom edge of each supporting leg 4 extends 20mm beyond the bottom of the base cylinder 1. The base cylinder 1 is a steel cylinder with dimensions of 120mm inner diameter × 3mm wall thickness × 500mm height. The bottom of the base cylinder 1 is sealed with a steel base plate with a diameter of 126mm × thickness of 3mm.

[0053] The slurry outlet 8 can be set to be relatively small, or arranged at the edge of the base plate 9, so that the core can fall directly onto the base plate 9. However, in order to facilitate the discharge of mud, the slurry outlet 8 is opened in the middle of the base plate 9 (specifically, a hole with a diameter of 30mm can be opened as the slurry outlet 8). The core discharge and connection device also includes a filter plate 7, which is arranged on the base plate 9 and has a gap with the base plate 9.

[0054] Specifically, the filter tray 7 has multiple protrusions 17 supporting the base plate 9 on one side, with each protrusion 17 arranged circumferentially on the filter tray 7; the outer periphery of the filter tray 7 has multiple slurry outlet notches 18, which communicate with the slurry outlet 8. The protrusions 17 and slurry outlet notches 18 are preferably arranged alternately circumferentially, such as... Figure 2 As shown.

[0055] The protrusion 17 can be configured as a hemispherical welded to the filter plate 7, or the protrusion 17 can be configured as an integral structure with the filter plate 7; this embodiment is not limited to either. The filter plate 7 has a diameter of 100mm × thickness of 3mm, and four slurry outlet notches 18 of 30mm in length × 30mm in width can be evenly opened on the edge of the filter plate 7; a hemispherical sphere of 20mm in diameter is welded between two adjacent slurry outlet notches 18. The protrusion 17 of the filter plate 7 faces the bottom plate 9 and is fastened to the bottom plate 9, forming a channel for the mud to flow to the outlet 8. At the same time, when the core is being extracted, the core inside the base cylinder 1 can be pushed out by pushing the filter plate 7.

[0056] The outer wall of the base cylinder 1 is provided with multiple handles, including a pair of handles 6 fixed to the opposite position on the top outer wall of the base cylinder 1, so that the user can hold the base cylinder 1 with both hands or support it with one hand; it also includes an end ear 5 fixed to the bottom outer wall of the base cylinder 1, which is arranged in sequence with a handle 6 in the vertical direction for pouring out the core.

[0057] In this embodiment, the base cylinder 1 is provided with a lifting lug 6 and an end lug 5, which can realize safe core connection and suspension placement. When it is necessary to place the rock core in the first variable diameter arc plate 3 into the rock core box, the base cylinder 1 can be manually tilted by using the lifting lug 6 and the corresponding end lug 5 to make the rock core slide out.

[0058] Specifically, two semicircular rings with a diameter of 120 mm are welded on both sides of the top outer wall of the base cylinder 1 at a distance of 10 mm from the top edge of the cylinder to serve as lifting lugs 6. A semicircular ring with a diameter of 120 mm is welded on 100 mm from the bottom of the cylinder to serve as an end lug 5. The end lug 5 and one of the lifting lugs 6 are set in a vertical direction.

[0059] In the aforementioned core outlet and core connection device, the first cleaning valve 10 includes:

[0060] Tangential tube 14 is fixed to the first mounting hole of the base cylinder 1, and the outlet end of the tangential tube 14 is connected to the interior of the base cylinder 1.

[0061] Connecting cap 28, the first end of which is threaded to the inlet end of tangential tube 14, and the second end is provided with a plug 30.

[0062] Specifically, a 30mm diameter hole is drilled in the side wall of the base cylinder 1, 50mm from the top edge, and a first cleaning valve is welded to the outside of this hole. The tangential tube 14 in the first cleaning valve has an inner diameter of 30mm and a wall thickness of 3mm. The connecting end of the tangential tube 14 is cut at a 30° angle and then welded to the hole drilled in the base cylinder 1. The other end of the tangential tube 14 is machined with an internal threaded ring 27, which is screwed onto a connecting cap 28. The end of the connecting cap 28 connected to the tangential tube 14 has an inner diameter of 30mm, and this end is machined with external threads and screwed into the tangential tube 14. The other end of the connecting cap 28 is provided with a protrusion 29 with external threads for connecting the cleaning pipeline. When not cleaning, it is plugged with a plug 30 with internal threads.

[0063] When applied, if the first variable diameter arc plate 3 discharges the core, the tangential pipe 14 of the first cleaning valve 10 is at a certain angle, which can ensure that the cleaning fluid forms a vortex inside the base cylinder 1, thus improving the cleaning effect.

[0064] The first variable diameter arc plate 3 is movably mounted on the base cylinder 1 via a variable diameter adjustment valve 2; the variable diameter adjustment valve 2 includes:

[0065] Prism 21 is inserted into the second mounting hole of the base cylinder 1 in a radially movable manner; one end of prism 21 is fixedly connected to the first variable diameter arc plate 3; the shape of the second mounting hole is the same as the cross-sectional shape of prism 21 to prevent prism 21 from rotating around its own axis.

[0066] Support 22 is fixed to the outside of the cylinder wall 19 of the base cylinder 1;

[0067] The lead screw 23 is installed on the support frame 22 by means of threaded connection, and one end of the lead screw 23 is rotatably clamped in the prism 21 around its own axis.

[0068] Preferably, there are two first variable diameter arc plates 3, and the two are arranged opposite to each other inside the base cylinder 1.

[0069] Specifically, prism 21 can be set as a hexagonal prism, and the corresponding second mounting hole is a hexagonal hole. The first variable diameter arc plate 3 is arc-shaped, with a length of 350mm × wall thickness of 2mm × diameter of 70mm; the two first variable diameter arc plates 3 are arranged vertically opposite to each other in the base cylinder 1, and the two first variable diameter arc plates 3 can move radially along the base cylinder 1 by rotating the variable diameter adjustment valve 2, thereby changing the diameter of the core being picked up; holes are opened at opposite positions on the cylinder wall 19 of the base cylinder 1 for installing the variable diameter adjustment valve 2 that cooperates with the two first variable diameter arc plates 3 respectively.

[0070] More specifically, the hexagonal prism in the variable diameter regulating valve 2 has a regular hexagonal cross-section, with dimensions of 120mm in height and 20mm in equal side length. It includes a top cavity 32, a rotating cylinder cavity 33, and a bottom cavity 34 connected in sequence, each 40mm long. A 10mm diameter through-hole is opened in the middle of the top cavity 32 for threading the lead screw 23. A 30mm diameter through-hole is opened in the middle of the rotating cylinder cavity 33, through which a solid steel column with a diameter of 29mm and a height of 40mm is installed as the rotating cylinder 20. The lead screw 23, extending from the through-hole of the top cavity 32, is welded to the center of the rotating cylinder 20. The bottom cavity 34 is a solid column, with its end extending into the base cut into an arc shape and welded centrally to the first variable diameter arc plate 3. The top cavity 32, rotating cylinder cavity 33, and bottom cavity 34 are sequentially welded to form a whole.

[0071] The lead screw 23 is made of steel column, with a diameter of 10mm and a length of 150mm. Only the first 100mm of the lead screw 23 is threaded, while the remaining 50mm is unthreaded. A through hole 25 is opened at the first end of the lead screw 23 as a turning hole 25, and a steel bar is inserted into the turning hole 25 as a handle 26 to facilitate the user's rotation of the lead screw 23. The support frame 22 is made of bent steel column with a diameter of 12mm. The support frame 22 is vertically welded to the outer wall of the base cylinder 1, and a fixing nut 24 is welded to the position corresponding to the lead screw 23. The fixing nut 24 is threadedly engaged with the lead screw 23.

[0072] The aforementioned core feeding and connecting device also includes a core straightening assembly, which comprises:

[0073] The straightening tube 37 is fixed to the base cylinder 1, and the straightening tube 37 is a hollow inner tube;

[0074] The screw is threaded into the centering tube 37 and is used to extend into the base cylinder 1 to center the rock core.

[0075] Specifically, a 30mm inner diameter × 5mm wall thickness × 50mm length inner thread tube is welded 50mm below the cleaning valve in the base cylinder 1 as a straightening thread tube 37. The straightening thread tube 37 is a hollow thread tube. After the screw is assembled, the screw can be extended and retracted by rotation to straighten the rock core inside the base cylinder 1.

[0076] Preferably, the above-mentioned core outlet and core connection device further includes an extension cylinder 13, which has openings at both ends and is used to fix and connect to the base cylinder 1 to lengthen the base cylinder 1; the extension cylinder 13 is provided with a second variable diameter arc plate and a second cleaning valve. The second variable diameter arc plate and the second cleaning valve are the same as the first variable diameter arc plate 3 and the second cleaning valve (specifically, the structure and installation method are the same), and will not be described in detail here.

[0077] The base cylinder 1 has a first connecting cylinder at its top end. The first connecting cylinder is coaxial with the base cylinder 1, and the diameter of the first connecting cylinder is larger than the diameter of the base cylinder 1. The lower end of the extension cylinder 13 is inserted into the first connecting cylinder and abuts against the base cylinder 1. The cap 15 is used to fix the upper end of the base cylinder 1 and block the upper opening of the extension cylinder 13.

[0078] Furthermore, a second connecting cylinder is connected to the top of the extension cylinder 13. The second connecting cylinder is coaxial with the extension cylinder 13, and the diameter of the second connecting cylinder is larger than the diameter of the extension cylinder 13. Connecting hoops 12 that are inserted into the connecting rod 35 are fixed to the outer periphery of the first connecting cylinder and the second connecting cylinder, respectively. Wing nuts 36 are installed at both ends of the connecting rod 35.

[0079] Specifically, the first connecting sleeve includes a sleeve 11 and a connecting plate 31. The sleeve 11 has an outer diameter of 159mm × height of 50mm × wall thickness of 5mm, and one end of the sleeve 11 is welded to the connecting plate 31. The connecting plate 31 has an inner diameter of 120mm × outer diameter of 159mm. The inner hole of the connecting plate 31 fits into the top of the base cylinder 1 and is welded flush with the top end face of the base cylinder 1. The upper end of the sleeve 11 has internal threads for screwing on the cap 15. Three tubes with an inner diameter of 15mm × wall thickness of 3mm × length of 50mm are evenly welded to the outside of the sleeve 11 as connecting clamps 12, which are used to pass through the connecting rod 35 that fixes the extension cylinder 13 to the base cylinder 1. The second connecting sleeve has the same structure and installation method as the first connecting sleeve, and will not be described again in this embodiment.

[0080] The extension tube 13 has the same diameter as the base tube 1. The lower end of the extension tube 13 is inserted into the sleeve 11 of the first connecting tube and docks with the base tube 1. The bottom of the extension tube 13 is placed above the connecting plate 31 of the first connecting tube. The connecting rod 35 is inserted into the connecting clamps 12 of the first and second connecting tubes in sequence. Then, the two ends of the connecting rod 35 are fixed by screwing on the wing nut to prevent the connecting rod 35 from moving in the connecting clamps 12 of the first and second connecting tubes, thereby fixing the base tube 1 and the extension tube 13.

[0081] The cover 15 measures 149mm in diameter and 50mm in height. The outer side of the cover 15 is threaded so that it can be screwed into the sleeve 11. A hexagonal nut is welded to the center of the top of the cover 15 to serve as a screw cap 16. The six sides of the hexagonal nut have centrally located through holes, into which a throttle 26 can be inserted.

[0082] In application, first determine the required number of extension tubes 13 based on the length of the drilled core. Then, connect the base tube 1 and extension tubes 13 sequentially, with the bottom of the extension tube 13 inserted into the adjacent sleeve 11 and positioned above the connecting plate 31. The extension tubes 13 and base tube 1 are then sequentially fixedly connected via connecting clamps 12 and connecting rods 35. After the extension tubes 13 and base tube 1 are connected, adjust the diameter-changing valve 2 according to the desired core diameter, moving the diameter-changing arc plate to a position suitable for the core's outer diameter. Finally, receive the core, allowing it to sequentially enter the extension tubes 13 and base tube 1 and be positioned between the diameter-changing arc plates. Drilling fluid and cleaning fluid then flow out from the slurry outlet 18 and slurry port 8 of the base tube 1. When the core needs to be stored for a long period, the sealing cap 15 engages with the sleeve 11 to achieve a seal.

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A core extraction and connection device, characterized in that, include: A base cylinder, wherein the bottom plate of the base cylinder has a slurry outlet and the top of the base cylinder has an opening; The base tube is used to receive the rock core; A first cleaning valve is fixed to the base cylinder and close to the top of the base cylinder; The first variable diameter arc plate is movable in a preset direction and installed inside the base cylinder to fit tightly against the outer wall of the core. A cap is provided, which can be fixed to the top of the base tube and close the top opening of the base tube; The first cleaning valve includes: A tangential tube is fixed to the first mounting hole of the base cylinder, and the outlet end of the tangential tube communicates with the interior of the base cylinder. A connecting cap, the first end of which is threaded to the inlet end of the tangential pipe, and the second end of which is provided with a plug; The first variable-diameter arc plate is movably mounted on the base cylinder via a variable-diameter adjustment valve; the variable-diameter adjustment valve includes: A prism is inserted into a second mounting hole in the base cylinder, which is movably inserted along the radial direction of the base cylinder; one end of the prism is fixedly connected to the first variable diameter arc plate. A support frame, which is fixed to the outer wall of the base cylinder; A lead screw is installed on the support frame by means of a threaded connection, and one end of the lead screw is rotatably fitted into the prism around its own axis.

2. The core extraction and connection device according to claim 1, characterized in that, It also includes a filter tray, which is arranged on the base plate and has a gap with the base plate.

3. The core extraction and connection device according to claim 2, characterized in that, The filter tray has multiple protrusions on the bottom plate facing one side, and each protrusion is arranged circumferentially along the filter tray; the outer periphery of the filter tray has multiple slurry outlet notches.

4. The core extraction and connection device according to claim 1, characterized in that, The outer wall of the base tube is provided with multiple handles.

5. The core extraction and connection device according to claim 1, characterized in that, It also includes a core straightening assembly, which comprises: A straightening wire tube is fixed to the base cylinder, and the straightening wire tube is a hollow inner wire tube; A screw, which is threaded into the straightening wire tube and is used to extend into the base cylinder to straighten the rock core.

6. The core output and connection device according to claim 1, characterized in that, Also includes: An extension tube, which is open at both ends, is used to be fixedly connected to the base tube to lengthen the base tube; The extension cylinder is equipped with a second variable diameter arc plate and a second cleaning valve.

7. The core extraction and connection device according to claim 6, characterized in that, The base tube has a first connecting tube at its top end. The first connecting tube is coaxial with the base tube, and the diameter of the first connecting tube is larger than the diameter of the base tube. The lower end of the extension tube is inserted into the first connecting tube and abuts against the base tube. The cap is used to fix the upper end of the base tube and block the upper opening of the extension tube.

8. The core extraction and connection device according to claim 7, characterized in that, The top end of the extension tube is connected to a second connecting tube, the second connecting tube is coaxial with the extension tube, and the diameter of the second connecting tube is larger than the diameter of the extension tube. The outer periphery of the first connecting cylinder and the second connecting cylinder are respectively fixed with connecting hoops that fit into the connecting rod, and wing nuts are respectively installed at both ends of the connecting rod.

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