Low-disturbance pressure and heat preservation integrated coring tool
By designing an integrated low-disturbance, pressure-maintaining, and heat-insulating coring tool, the problems of rock strata disturbance and sample instability caused by traditional coring tools were solved, achieving efficient and stable coring and real-time monitoring of samples.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-03-13
AI Technical Summary
Traditional coring tools cause rock strata disturbance during the coring process, leading to sample instability. Furthermore, existing pressure and heat preservation technologies are costly and inefficient.
A low-disturbance, pressure-maintaining, and temperature-preserving integrated coring tool is designed. By improving the tool's structure and materials, including the separation mechanism, anti-disturbance bearings, differential mechanism, and cleaning device, the disturbance to the rock strata is reduced, and the temperature and pressure of the cored sample are kept stable.
It reduced rock strata disturbance during the core sampling process, improved the integrity and stability of the core samples, increased core sampling efficiency, and enabled real-time monitoring of sample temperature and pressure.
Smart Images
Figure CN121654352A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of core sampling equipment, and more particularly to a low-disturbance, pressure-holding, and heat-insulating integrated core sampling tool. Background Technology
[0002] In geological exploration, traditional coring tools can cause rock strata disturbance during the coring process, and temperature changes can easily lead to sample instability, thus affecting sample quality and analytical results. Existing pressure-holding and heat-holding technologies also suffer from high costs and low efficiency. Therefore, developing a low-disturbance, integrated pressure-holding and heat-holding coring tool is of particular importance. Summary of the Invention
[0003] The present invention aims to provide a low-disturbance, pressure-maintaining, and heat-insulating integrated coring tool. By improving the tool's structure and materials, it reduces disturbance to the surrounding rock strata while maintaining the temperature and pressure of the cored sample, thereby improving the integrity and stability of the cored sample.
[0004] To achieve the above objectives, the present invention employs the following technical solution: This invention discloses a low-disturbance pressure-holding and heat-insulating integrated coring tool, including an outer tube assembly, a drill bit installed at the bottom end of the outer tube assembly, a pressure-holding sealing plate provided on the side wall of the bottom end of the outer tube assembly, and an inner tube assembly provided inside the outer tube assembly. The inner tube assembly includes a separation mechanism, a differential mechanism, a cleaning mechanism, and a core tube arranged sequentially from top to bottom. The separation mechanism includes a separation inner cylinder, the bottom end of which is sleeved on the top end of the separation outer cylinder. A load-bearing ring is provided on the bottom outer wall of the separation inner cylinder, and a load-bearing groove is provided on the top inner wall of the separation outer cylinder. A load-bearing bearing is installed between the load-bearing ring and the load-bearing groove. The differential mechanism includes a differential inner cylinder, the top end of which is coaxially and fixedly connected to the bottom end of the outer cylinder, the bottom end of which is sleeved inside the top end of the differential outer cylinder, a locking tooth on the outer wall in the middle of the differential inner cylinder, a locking claw on the outer wall at the top of the differential outer cylinder, the locking claw being adapted to the locking tooth, a ball-throwing ring on the bottom end of the differential inner cylinder, an inner cylinder through hole at the bottom of the differential inner cylinder, the inner cylinder through hole being higher than the ball-throwing ring being placed at the ball-throwing position, and an outer cylinder through hole at the bottom of the differential outer cylinder. The cleaning mechanism includes a cleaning outer tube, which is connected to the bottom of the differential outer cylinder. A cleaning piston is provided at the top of the cleaning outer tube. The cleaning piston is sealed and connected to the cleaning channel. The cleaning channel is initially located at the bottom of the differential outer cylinder. The inner cavity of the cleaning channel is a variable diameter hole with a larger upper diameter and a smaller lower diameter. A cleaning through hole is provided on the bottom side wall of the cleaning channel. The core tube is connected to the cleaning outer tube via a connecting seat. A one-way valve is installed inside the connecting seat. The core tube includes a core outer tube and a core inner tube. A drain hole is provided on the top side wall of the core inner tube. A straightening ring is provided in the middle of the core inner tube. The outer edge of the straightening ring extends to the outside of the core inner tube. The straightening ring is provided with a guide hole. The guide hole connects the core inner tube and the gap between the core inner tube and the core outer tube. A pressure holding chamber end cap is provided at the bottom of the core tube. An anti-disturbance bearing is provided between the pressure holding chamber end cap and the outer tube assembly. A core retaining ring is provided at the bottom of the core inner tube.
[0005] Preferably, the outer separating cylinder includes an upper separating cylinder and a lower separating cylinder. The upper separating cylinder is fitted around the top outer periphery of the lower separating cylinder. The top surface of the inner cavity of the upper separating cylinder and the top surface of the lower separating cylinder form a load-bearing groove. The top surface and ground surface of the load-bearing ring are respectively provided with load-bearing bearings between the two sides of the load-bearing groove. The top of the inner cavity of the inner separating cylinder is provided with a regular polygonal hole.
[0006] Preferably, the bottom outer side of the throwing ring is provided with multiple sealing rings, and the bottom of the throwing ring is sealed and slidably connected to the differential outer cylinder.
[0007] Preferably, the one-way valve in the connecting seat connects the cleaning mechanism and the core tube. The connecting seat is equipped with a monitoring mechanism, which includes a battery, a temperature probe, and a pressure probe. The temperature probe and pressure probe are used to detect the working conditions inside the core tube.
[0008] Preferably, the connector has a sealed chamber, one end of which has a sealing end cap, and the other end of which has an interface end cap. Temperature probes and pressure probes are mounted on the interface end cap, and the battery and sensor are mounted inside the sealed chamber.
[0009] Preferably, the anti-disturbance bearing includes an inner ring and an outer ring, both of which are made of magnetic materials and are designed with magnetic repulsion between them.
[0010] Preferably, the outer tube assembly is made up of multiple outer tube segments that are sequentially inserted and threaded together.
[0011] Preferably, the core tube has an anti-rotation section in the middle, the outer periphery of the anti-rotation section is a regular polygon, the outer periphery of the anti-rotation section is slidably connected to an anti-rotation ring, and the anti-rotation ring is fixedly connected to the inner wall of the outer tube assembly.
[0012] Preferably, the inner wall of the outer tube assembly is provided with a heat insulation layer.
[0013] The beneficial effects of this invention are: 1. The present invention can reduce the interference caused by vibration and movement of the outer tube assembly to the core tube through the separation mechanism, anti-disturbance bearing and differential mechanism.
[0014] 2. In this invention, the drainage hole of the core cylinder effectively reduces the pressure increase inside the core cylinder caused by the core entering the core cylinder, thereby effectively improving the core extraction efficiency.
[0015] 3. By setting up a cleaning device, the present invention can effectively avoid the adverse effects such as jamming caused by core residue on the moving mechanism.
[0016] 4. The present invention can monitor the working condition of the core cylinder in a timely manner through the temperature and pressure detection device directly installed in the connecting seat. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the present invention; Figure 2 for Figure 1 A schematic diagram of part A in the middle; Figure 3 for Figure 1 A schematic diagram of Part B; Figure 4 for Figure 1 A schematic diagram of section C; Figure 5 for Figure 1 A schematic diagram of section D; Figure 6 for Figure 1 A schematic diagram of section E in the middle; Figure 7 for Figure 1 A schematic diagram of section F in the middle; Figure 8 This is a sectional view of the connector. Figure 9 This is a cross-sectional view of the straightening ring.
[0018] In the diagram: 1-Outer tube assembly, 2-Pressure-holding sealing plate, 3-Separating inner cylinder, 4-Bearing ring, 5-Bearing groove, 6-Bearing bearing, 7-Upper part of separating outer cylinder, 8-Lower part of separating outer cylinder, 9-Differential inner cylinder, 10-Differential outer cylinder, 11-Clamping tooth, 12-Clamping claw, 13-Ball-throwing clamping ring, 14-Inner cylinder through hole, 15-Outer cylinder through hole, 16-Cleaning outer tube, 17-Cleaning piston, 18-Cleaning through hole, 19-Cleaning channel, 20-Connection 21-One-way valve, 22-Temperature probe, 23-Pressure probe, 24-Interface end cap, 25-Sealing end cap, 26-Regular polygonal hole, 27-Outer core cylinder, 28-Inner core cylinder, 29-Drain hole, 30-Straightening ring, 31-Flow guide hole, 32-Pressure holding chamber end cap, 33-Core retaining ring, 34-Inner ring, 35-Outer ring, 36-Anti-rotation section, 37-Anti-rotation ring, 38-Sealed chamber, 39-Ball throw, 40-Pressure holding space. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings.
[0020] like Figures 1-9As shown, the present invention includes an outer tube assembly 1, a drill bit is installed at the bottom end of the outer tube assembly 1, a pressure-holding sealing plate 2 is provided on the side wall of the bottom end of the outer tube assembly 1, and an inner tube assembly is provided inside the outer tube assembly 1. The inner tube assembly includes a separation mechanism, a differential mechanism, a cleaning mechanism, and a core tube arranged sequentially from top to bottom. The separation mechanism includes a separation inner cylinder 3, the bottom end of which is sleeved on the top end of the separation outer cylinder. The bottom outer wall of the separation inner cylinder 3 is provided with a load-bearing ring 4, and the top inner wall of the separation outer cylinder is provided with a load-bearing groove 5. A load-bearing bearing 6 is installed between the load-bearing ring 4 and the load-bearing groove 5. The differential mechanism includes a differential inner cylinder 9, the top end of which is coaxially and fixedly connected to the bottom end of the outer cylinder. The bottom end of the differential inner cylinder 9 is sleeved inside the top end of the differential outer cylinder 10. The outer wall of the middle part of the differential inner cylinder 9 is provided with a locking tooth 11. The outer wall of the top of the differential outer cylinder 10 is provided with a locking claw 12, which is adapted to the locking tooth 11. The bottom end of the differential inner cylinder 9 is provided with a ball-throwing ring 13. The bottom of the differential inner cylinder 9 is provided with an inner cylinder through hole 14, which is higher than the ball-throwing ring 13 when the ball 39 is placed. The inner cylinder through hole 14 connects to the sealed pressure space 40 formed at the connection between the differential inner cylinder 9 and the differential outer cylinder 10. The bottom of the differential outer cylinder 10 is provided with an outer cylinder through hole 15. The cleaning mechanism includes a cleaning outer tube 16, which is connected to the bottom end of the differential outer cylinder 10. A cleaning piston 17 is provided at the top end of the cleaning outer tube 16. The cleaning piston 17 is sealed to the cleaning channel 19. The cleaning channel 19 is initially located at the bottom of the differential outer cylinder 10. The inner cavity of the cleaning channel 19 is a variable diameter hole with a larger upper diameter and a smaller lower diameter. A cleaning through hole 18 is provided on the bottom side wall of the cleaning channel 19. The core tube is connected to the cleaning outer tube 16 via a connecting seat 20. A one-way valve 21 is provided inside the connecting seat 20. The core tube includes a core outer tube 27 and a core inner tube 28. A drain hole 29 is provided on the top side wall of the core inner tube 28. A straightening ring 30 is provided in the middle of the core inner tube 28. The outer edge of the straightening ring 30 extends to the outside of the core inner tube 28. The straightening ring 30 is provided with a guide hole 31, which connects the core inner tube 28 and the gap between the core inner tube 28 and the core outer tube 27. A pressure holding chamber end cap 32 is provided at the bottom of the core tube. An anti-disturbance bearing is provided between the pressure holding chamber end cap 32 and the outer tube assembly 1. A core retaining ring 33 is provided at the bottom of the core inner tube 28.
[0021] In order to achieve the suspension state of the differential mechanism through the separation mechanism and further reduce the upper disturbance, and to further ensure the separation of the inner cylinder 3 and the outer cylinder, the outer cylinder includes an upper outer cylinder 7 and a lower outer cylinder 8. The upper outer cylinder 7 is sleeved on the top outer periphery of the lower outer cylinder 8. The top surface of the inner cavity of the upper outer cylinder 7 and the top surface of the lower outer cylinder 8 form a load-bearing groove 5. The top surface and the ground surface of the load-bearing ring 4 are respectively provided with load-bearing bearings 6 between the two sides of the load-bearing groove 5. The top of the inner cavity of the inner cylinder 3 is provided with a regular polygonal hole 26.
[0022] In order to achieve a sealed connection between the differential inner cylinder 9 and the differential outer cylinder 10, the bottom outer side of the ball-throwing ring 13 is provided with multiple sealing rings, and the bottom of the ball-throwing ring 13 is sealed and slidably connected to the differential outer cylinder 10.
[0023] To enable real-time monitoring of the working conditions inside the core cylinder, a one-way valve 21 in the connecting seat 20 connects the cleaning mechanism and the core cylinder. The connecting seat 20 is equipped with a monitoring mechanism, which includes a battery, a temperature probe 22, and a pressure probe 23. The temperature probe 22 and the pressure probe 23 are used to detect the working conditions inside the core cylinder. The connecting seat 20 is equipped with a sealed chamber 38. One end of the sealed chamber 38 is equipped with a sealing end cap 25, and the other end of the sealed chamber 38 is equipped with an interface end cap 24. The temperature probe 22 and the pressure probe 23 are installed on the interface end cap 24, and the battery and the sensor are installed inside the sealed chamber 38.
[0024] In order to keep the core tube and the outer tube assembly 1 separated, the anti-disturbance bearing includes an inner ring 34 and an outer ring 35. Both the inner ring 34 and the outer ring 35 are made of magnetic materials and are designed with magnetic repulsion.
[0025] To improve the practicality of the equipment, the outer tube assembly 1 is made up of multiple sections of outer tube that are sequentially inserted and threaded together.
[0026] To further maintain the stability of the core tube, an anti-rotation section 36 is provided in the middle of the core tube. The outer periphery of the anti-rotation section 36 is a regular polygon. An anti-rotation ring 37 is slidably connected to the outer periphery of the anti-rotation section 36. The anti-rotation ring 37 is fixedly connected to the inner wall of the outer tube assembly 1.
[0027] In actual use, the separation mechanism and the anti-disturbance bearing ensure that the differential mechanism, core tube, etc. are suspended, which can reduce external disturbances. Differential mechanism working process: The ball 39 is thrown onto the ball-throwing ring 13. The bottom end of the differential inner cylinder 9 is isolated from the differential outer cylinder 10. The drilling fluid flows into the pressure-stabilized space 40 through the inner cylinder through hole 14. The pressure-stabilized space 40 gradually expands under the continuous injection of drilling fluid, which drives the differential outer cylinder 10 to move upward and complete the lifting action. After the upper body is in place, the locking claw 12 engages with the locking tooth 11. At the same time, the inner cylinder through hole 14 and the outer cylinder through hole 15 are aligned, and the drilling fluid is discharged through the outer cylinder through hole 15. The cleaning mechanism works as follows: A ball 39 is dropped into the cleaning channel 19. The drilling fluid is transferred to the cleaning channel 19 through the inner cavity of the differential mechanism and the cleaning channel 19 is pressed down. Then the cleaning piston 17 moves downward and discharges the fluorinated liquid stored in the outer cleaning pipe 16 into the inner core cylinder 28 through the one-way valve 21 on the connecting seat 20. The drilling fluid in the inner core cylinder 28 is squeezed to the outside of the inner core cylinder 28. When the core sample is collected, the drilling fluid in the inner core cylinder 28 is discharged from the drainage hole 29 into the gap between it and the outer core cylinder 27, and then flows into the end of the core cylinder from the guide hole 31 of the centralizing ring 30, reducing the liquid resistance during the core entry process and improving the core entry efficiency. Meanwhile, the outer shell of the outer tube assembly 1 is made of high-strength alloy material, and the inner surface is covered with a heat insulation layer. The heat insulation layer uses high-performance heat insulation material, which can effectively maintain the temperature of the sample.
[0028] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.
Claims
1. A low-disturbance, pressure-holding, and heat-insulating integrated coring tool, characterized in that: It includes an outer tube assembly (1), a drill bit is installed at the bottom of the outer tube assembly (1), a pressure-holding sealing plate (2) is provided on the side wall of the bottom end of the outer tube assembly (1), and an inner tube assembly is provided inside the outer tube assembly (1). The inner tube assembly includes a separation mechanism, a differential mechanism, a cleaning mechanism, and a core tube arranged sequentially from top to bottom. The separation mechanism includes a separation inner cylinder (3), the bottom end of which is sleeved on the top end of the separation outer cylinder. A load-bearing ring (4) is provided on the bottom outer wall of the separation inner cylinder (3), and a load-bearing groove (5) is provided on the top inner wall of the separation outer cylinder. A load-bearing bearing (6) is installed between the load-bearing ring (4) and the load-bearing groove (5). The differential mechanism includes a differential inner cylinder (9), the top end of the differential inner cylinder (9) is coaxially fixedly connected to the bottom end of the differential outer cylinder, the bottom end of the differential inner cylinder (9) is sleeved inside the top end of the differential outer cylinder (10), the middle outer wall of the differential inner cylinder (9) is provided with a locking tooth (11), the top outer wall of the differential outer cylinder (10) is provided with a locking claw (12), the locking claw (12) is adapted to the locking tooth (11), the bottom end of the differential inner cylinder (9) is provided with a ball-throwing ring (13), the bottom of the differential inner cylinder (9) is provided with an inner cylinder through hole (14), the inner cylinder through hole (14) is higher than the ball-throwing ring (13) when the ball (39) is placed, the inner cylinder through hole (14) connects to the sealed pressure space (40) formed at the connection between the differential inner cylinder (9) and the differential outer cylinder (10), the bottom of the differential outer cylinder (10) is provided with an outer cylinder through hole (15). The cleaning mechanism includes a cleaning outer tube (16), which is connected to the bottom end of the differential outer cylinder (10). A cleaning piston (17) is provided at the top end of the cleaning outer tube (16). The cleaning piston (17) is sealed and connected to the cleaning channel (19). The cleaning channel (19) is initially located at the bottom of the differential outer cylinder (10). The inner cavity of the cleaning channel (19) is a variable diameter hole with a larger upper diameter and a smaller lower diameter. A cleaning through hole (18) is provided on the bottom side wall of the cleaning channel (19). The core tube is connected to the cleaning outer tube (16) via a connecting seat (20). A one-way valve (21) is provided inside the connecting seat (20). The core tube includes a core outer tube (27) and a core inner tube (28). A drain hole (29) is provided on the top side wall of the core inner tube (28). A straightening ring (30) is provided in the middle of the core inner tube (28). The outer edge of the straightening ring (30) extends to the outside of the core inner tube (28). A guide hole (31) is provided on the straightening ring (30). The guide hole (31) connects the core inner tube (28) and the gap between the core inner tube (28) and the core outer tube (27). A pressure holding chamber end cap (32) is provided at the bottom of the core tube. An anti-disturbance bearing is provided between the pressure holding chamber end cap (32) and the outer tube assembly (1). A core retaining ring (33) is provided at the bottom of the core inner tube (28).
2. The core-removing tool according to claim 1, characterized in that: The outer cylinder includes an upper part (7) and a lower part (8). The upper part (7) is fitted around the top of the lower part (8). The top surface of the inner cavity of the upper part (7) and the top surface of the lower part (8) form a load-bearing groove (5). The top surface and the ground surface of the load-bearing ring (4) are respectively provided with load-bearing bearings (6) between the two sides of the load-bearing groove (5). The top of the inner cavity of the inner cylinder (3) is provided with a regular polygonal hole (26).
3. The core-removing tool according to claim 1, characterized in that: The bottom outer side of the ball-throwing ring (13) is provided with multiple sealing rings, and the bottom of the ball-throwing ring (13) is sealed and slidably connected to the differential outer cylinder (10).
4. The core-removing tool according to claim 1, characterized in that: The one-way valve (21) inside the connecting seat (20) connects the cleaning mechanism and the core tube. The connecting seat (20) is equipped with a monitoring mechanism, which includes a battery, a temperature probe (22), and a pressure probe (23). The temperature probe (22) and the pressure probe (23) are used to detect the working conditions inside the core tube.
5. The core-removing tool according to claim 4, characterized in that: The connector (20) is provided with a sealed chamber (38), one end of the sealed chamber (38) is provided with a sealed end cap (25), and the other end of the sealed chamber (38) is provided with an interface end cap (24). Temperature probe (22) and pressure probe (23) are installed on the interface end cap (24), and the battery and sensor are installed in the sealed chamber (38).
6. The core-retrieving tool according to claim 1, characterized in that: The anti-disturbance bearing includes an inner ring (34) and an outer ring (35). Both the inner ring (34) and the outer ring (35) are made of magnetic materials, and the inner ring (34) and the outer ring (35) are designed with magnetic repulsion.
7. The core-removing tool according to claim 1, characterized in that: The outer tube assembly (1) is made up of multiple sections of outer tube that are sequentially inserted and threaded together.
8. The core-removing tool according to claim 1, characterized in that: The core tube is provided with an anti-rotation section (36) in the middle. The outer periphery of the anti-rotation section (36) is a regular polygon. The outer periphery of the anti-rotation section (36) is slidably connected to the anti-rotation ring (37). The anti-rotation ring (37) is fixedly connected to the inner wall of the outer tube assembly (1).
9. The core-removing tool according to claim 1, characterized in that: The inner wall of the outer tube assembly (1) is provided with a heat insulation layer.