Continuous coring device

Abstract

The present application relates to the technical field of drilling and coring in the field of oil and natural gas, and discloses a continuous coring device. The continuous coring device comprises an outer barrel, the upper end and lower end of which are respectively connected to a joint and a coring bit; a linear motion mechanism and multiple nested coring inner barrels are provided in the outer barrel; the lower end of the outermost coring inner barrel extends into and is mounted in the coring bit; and among two adjacent coring inner barrels, the linear motion mechanism can drive the inner coring inner barrel to move in the axial direction of the outer coring inner barrel. The present application has the advantages that continuous coring can be achieved, and a single-run coring operation can achieve a drilling footage of 20-30 meters or above, which improves the efficiency by at least 2-3 times compared with conventional processes, thereby greatly reducing drilling costs and improving the coring efficiency.

Description

Continuous coring device

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411990409.2, filed with the Chinese Patent Office on December 31, 2024, entitled “Continuous Core Taking Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of core drilling technology in the oil and gas industry, and specifically to a continuous core drilling device. Background Technology

[0004] Medium-length coring is a coring technique that allows for the upward connection of a single drill pipe during coring, with a single coring length exceeding two drill pipes. The coring length is typically between 20-30 meters; reaching 30 meters qualifies as long-length coring. Long-length coring is usually used when the rock has good cementation and integrity. The purpose of long-length coring is to maximize the footage per drill pipe while ensuring a high core recovery rate. It represents an improvement and development of conventional coring technology. In oil and gas development, especially in deep coalbed methane and shale oil development, the use of long-length coring is of great significance for increasing drilling speed and reducing drilling costs.

[0005] Significant progress has been made in coring technology as it has advanced into high-precision fields such as heat preservation and pressure maintenance, and on-site nuclear magnetic resonance testing. However, the core recovery rate remains the fundamental technical indicator for coring operations, and how to obtain longer core samples in a single well entry is an urgent problem to be solved in coring field operations. Currently, only drilling rigs equipped with top drives can perform medium- and long core drilling; ordinary mechanical drilling rigs do not have this capability.

[0006] Application content

[0007] The purpose of this application is to overcome the problem of how to obtain longer core samples in a single well entry of the existing coring tool, and to provide a continuous coring device that can achieve continuous coring and a single-tube coring operation footage of 20-30 meters or more, which is at least 2 to 3 times more efficient than the original process, greatly saves drilling costs and improves coring efficiency.

[0008] To achieve the above objectives, this application provides a continuous coring device, which includes an outer cylinder with connectors and a coring drill bit connected to its upper and lower ends, respectively. The outer cylinder is provided with a linear motion mechanism and multiple nested inner coring cylinders. The lower end of the outermost inner coring cylinder extends into the coring drill bit. In adjacent inner coring cylinders, the linear motion mechanism can drive the inner inner coring cylinder to move axially along the outer inner coring cylinder.

[0009] Optionally, the linear motion mechanism is connected to the innermost core-taking inner cylinder, and in two adjacent core-taking inner cylinders, the inner core-taking inner cylinder and the outer core-taking inner cylinder are axially limited by a limiting structure.

[0010] Optionally, a partition flipping mechanism is provided between two adjacent core-taking inner cylinders. The partition of the partition flipping mechanism is located between the inner core-taking inner cylinder and the outer core-taking inner cylinder. When the linear motion mechanism drives the inner core-taking inner cylinder to move up to above the partition, the partition can flip to cover the flow section of the outer core-taking inner cylinder.

[0011] Optionally, the partition flipping mechanism includes a torsion spring installed on the outer core-taking inner cylinder. The torsion spring is fixed to the inner wall of the outer core-taking inner cylinder by a movable pin, and one end of the partition is provided with a mounting hole for installing the torsion spring.

[0012] Optionally, the partition flipping mechanism includes a partition limiting structure, which is disposed on the outer core inner cylinder at a position opposite to the torsion spring to restrict the partition from moving downward.

[0013] Optionally, the linear motion mechanism includes a hydraulic pump and a hydraulic cylinder assembly connected together. The push rod of the hydraulic cylinder assembly is connected to the rack in the gear and rack pair. The inner wall of the outer cylinder is provided with an axially extending gear track that is adapted to the gear in the gear and rack pair. A solenoid valve group is installed on the connecting pipeline between the hydraulic pump and the hydraulic cylinder assembly.

[0014] Optionally, the linear motion mechanism includes a crawling outer cylinder, a radial limiting plate formed in the middle of the crawling outer cylinder, the radial limiting plate having a through hole for the rack to pass through, the top end of the rack having a radially extending limiting head, the limiting head being connected to the push rod, and a spring being installed between the limiting head and the radial limiting plate.

[0015] Optionally, the motor of the hydraulic pump is connected to a control circuit board, which is electrically connected to an output terminal installed in the battery compartment.

[0016] Optionally, the continuous coring device is provided with an anchoring component, which is connected to the upper end of the innermost coring cylinder.

[0017] Optionally, the anchoring assembly is a hydraulic anchoring assembly, and the hydraulic oil inlet of the hydraulic anchoring assembly is connected to the solenoid valve assembly.

[0018] Optionally, along the direction from the joint to the core drill bit, the outer cylinder is provided with a plug, a protective sleeve, a hydraulic cylinder assembly, a crawling outer cylinder, an anchoring assembly, and a multi-layered core drill inner cylinder nested inside and outside. The protective sleeve is equipped with a battery compartment, a control circuit board, a hydraulic pump, and a solenoid valve assembly connected in sequence.

[0019] Optionally, the battery compartment is provided with a power plug at one end near the plug, and a sensor is provided on the plug, with the sensor electrically connected to the power plug.

[0020] Optionally, the upper end of the anchoring assembly is mounted on one end of the bearing connecting rod via a bearing sleeve, and the other end of the bearing connecting rod is connected to the crawling outer cylinder.

[0021] Through the above technical solution, the inner and outer core-taking inner cylinders nested in the continuous coring device of this application can use a linear motion mechanism to drive the innermost core-taking inner cylinder and the rock core inside it to rise after one core is taken, so that the subsequent outer core-taking inner cylinder can continuously perform multiple cores, and can obtain a longer rock core in a single well entry.

[0022] Furthermore, the linear motion mechanism, driven by a combination of battery and hydraulic power, enables ordinary drilling rigs to perform long-tube coring operations, eliminating the previous limitations of top drive operations. It can be widely applied to drilling and coring operations of various models and sizes, with no technical barriers to application and broad application prospects. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the structure of a continuous core-taking device according to one embodiment of this application;

[0024] Figure 2 is a schematic diagram of the continuous core sampling principle according to one embodiment of this application;

[0025] Figure 3 is a schematic diagram of the electrically controlled output principle of one embodiment of this application;

[0026] Figure 4 is a schematic diagram of the partition flipping mechanism according to one embodiment;

[0027] Figure 5 is a schematic diagram of another state of Figure 4;

[0028] Figure 6 is a schematic diagram of the gear and rack pair in Figure 1;

[0029] Figure 7 is a control flowchart of the control circuit board.

[0030] Explanation of reference numerals in the attached diagram: 1. Connector; 2. Outer cylinder; 3. Sensor; 4. Power plug; 5. Plug; 6. Casing; 7. Battery compartment; 8. Control circuit board; 9. Motor; 10. Hydraulic pump; 11. Solenoid valve assembly; 12. Push rod; 13. Rack; 14. Crawling outer cylinder; 15. Gear; 16. Fixing pin; 17. Bearing cap; 18. Bearing connecting rod; 19. Bearing; 20. Anchoring assembly; 23. Inner core cylinder; 24. Outer core cylinder; 25. Partition; 26. Limiting ball; 27. Core; 28. Core cylinder - Core claw; 29. ​​Core cylinder - Guide core; 30. Adjustable length and variable thread structure; 31. Core cylinder - Core claw; 32. Core cylinder - Guide core; 33. Core drill bit. Detailed Implementation

[0031] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0032] In this application, unless otherwise stated, "inner" and "outer" refer to the inner and outer contours of each component itself, and "upper," "lower," "top," and "bottom" are generally used to describe the relative positional relationships of the components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions. For ease of description, the advantages of this application are illustrated in the specific embodiments using the continuous coring device with two nested inner coring cylinders shown in Figures 1-6, but this application is not limited to this.

[0033] This application discloses a continuous coring device, which includes a connector 1, an outer cylinder 2, and a coring drill bit 33. The upper and lower ends of the outer cylinder 2 are respectively connected to the connector 1 and the coring drill bit 33. The outer cylinder 2 is provided with a linear motion mechanism and two nested inner coring cylinders, namely, a first coring cylinder 23 and a second coring cylinder 24. The lower end of the second coring cylinder 24 extends into the coring drill bit 33, and the first coring cylinder 23, the second coring cylinder 24, and the coring drill bit 33 are coaxially arranged. The linear motion mechanism is connected to the first coring cylinder 23 to drive the first coring cylinder 23 to move along the axial direction of the second coring cylinder 24.

[0034] Specifically, as shown in Figure 2(a), after the first coring cylinder 23 completes one coring operation, the linear motion mechanism pulls the first coring cylinder 23 upward as shown in Figure 2(b), and the second coring cylinder 24 performs a second coring operation. This application can achieve continuous coring and the single-cylinder coring operation footage can reach more than 20-30 meters, which is 2 to 3 times more efficient than the existing process, greatly saving drilling costs and improving coring efficiency.

[0035] It should be noted that the guide core and core claw of the inner core cylinder 1 23 and the inner core cylinder 24 adopt the structure of the prior art, which is well known to those skilled in the art and is not the core inventive point of this application, and will not be described in detail here. As shown in Figure 1, the inner core cylinder 24 adopts the length adjustment and buckle structure 30 of the prior art to realize the length adjustment during assembly, because there is an error in the assembly of tools that are too long, and the length needs to be adjusted to fit.

[0036] It is understandable that, in order to adapt to drilling at different depths, the outer cylinder 2 in this application can be formed by combining multiple cylinder sections.

[0037] In this application, the continuous coring device includes a partition flipping mechanism. In the initial state, as shown in Figure 2(a), the partition 25 of the partition flipping mechanism is located between the first coring inner cylinder 23 and the second coring inner cylinder 24. After the first coring inner cylinder 23 completes one coring operation, the linear motion mechanism drives the first coring inner cylinder 23 to move upward along the axial direction of the second coring inner cylinder 24 to above the partition 25. At this time, the linear motion mechanism stops working, as shown in Figure 2(b). The partition 25 can be flipped 90° to cover the flow section of the second coring inner cylinder 24. At this time, the first coring inner cylinder 23 and the core 27 move downward under the action of gravity and sit on the partition 25, as shown in Figure 2(c), thus completing the sealing and fixing of the first coring inner cylinder 23.

[0038] It should be noted that there are various partition flipping mechanisms that can achieve the flipping of partition 25. The following is an example, but not limited to this. For example, as shown in Figures 4 and 5, the partition flipping mechanism includes a torsion spring. The torsion spring is fixed to the inner wall of the second core-taking inner cylinder 24 by a movable pin. One end of the partition 25 is provided with a mounting hole for installing the torsion spring. In the initial state, as shown in Figure 2(a) and Figure 4, the partition 25 is limited by the first core-taking inner cylinder 23 and the second core-taking inner cylinder 24. When the first core-taking inner cylinder 23 moves upward to the position, the partition flips ninety degrees as shown in Figure 2(b) and Figure 5.

[0039] Since the partition 25 needs to bear the weight of the inner core cylinder 23 and the core 27, the partition 25 is prone to sinking. To address this, a partition limiting structure is provided on the inner core cylinder 24 opposite to the torsion spring. This partition limiting structure can restrict the downward movement of the partition 25. There are various partition limiting structures that can restrict the downward movement of the partition. The following is an example, but not limited to these. For example, a boss that supports the partition 25 can be extended inward from the inner wall of the inner core cylinder 24. Alternatively, as shown in Figures 4 and 5, a limiting ball 26 can be installed on the inner wall of the inner core cylinder 24 through a return spring. The partition 25 can be rotated 90 degrees. After rotating 90 degrees, the limiting ball 26 limits the partition 25, thereby achieving a stable seal and fixation of the inner core cylinder 23, and thus sealing the core in the inner core cylinder 23.

[0040] In this application, to prevent the inner core cylinder 24 from being pulled out when the inner core cylinder 23 is pulled upward, the inner core cylinder 23 and the inner core cylinder 24 are axially limited by a limiting structure. It is understood that there are various limiting structures that can prevent the outer cylinder from being pulled out when the inner cylinder is pulled upward. The following is an example, but it is not limited to this. For example, as shown in Figure 2, the upper end of the inner core cylinder 24 forms a limiting step inward. Correspondingly, the outer wall surface of the lower end of the inner core cylinder 23 has a protrusion that matches the limiting step.

[0041] It should be noted that there are various linear motion mechanisms capable of achieving linear motion to lift the inner core cylinder 23. The following is an illustrative description, but it does not limit this application. For example, as shown in Figure 1, the linear motion mechanism includes a hydraulic pump 10 and a hydraulic cylinder assembly connected together. To achieve smooth lifting, a gear and rack pair can be used. Specifically, the push rod 12 of the hydraulic cylinder assembly is connected to the rack 13 in the gear and rack pair, as shown in Figure 6. This gear and rack pair is symmetrically equipped with at least two gears, including at least one driven gear and a driving gear meshing with the rack. The inner wall of the outer cylinder 2 is provided with an axially extending gear track adapted to the gear 15. In this way, on the one hand, the linear motion is converted into the crawling motion of the gear 15 on the inner wall of the outer cylinder 2 through the cooperation of the gear and rack pair, which can realize electrically controlled automatic core extraction. The overall process has a high degree of automation, reducing the workload of on-site core extraction engineers. On the other hand, ordinary drilling rigs can also carry out long cylinder core extraction operations, removing the previous top drive operation restrictions and expanding the core extraction market.

[0042] It is understood that a solenoid valve assembly 11 is installed on the connecting pipeline between the hydraulic pump 10 and the hydraulic cylinder assembly. In this application, there are no special requirements for the solenoid valve assembly, and a solenoid valve that meets the two-position three-way function can be used in this application.

[0043] To reduce vibration, the linear motion mechanism includes a crawling outer cylinder 14, in which a radial limiting plate is formed. The radial limiting plate has a through hole for the rack 13 to pass through. A gear mounting groove is formed on the crawling outer cylinder between the rack 13 and the corresponding gear track on the inner wall of the outer cylinder 2. Thus, the gear surfaces on both radial sides of the gear mesh with the gear track and the rack 13 respectively. The top of the rack is provided with a radially extending limiting head. The top of the limiting head is connected to the push rod 12 of the hydraulic cylinder assembly and cannot pass through the through hole of the aforementioned radial limiting plate. A spring is installed between the limiting head and the radial limiting plate.

[0044] In this application, the motor 9 of the hydraulic pump 10 is connected to a control circuit board 8. The control circuit board 8 is electrically connected to the output terminal installed in the battery compartment 7. This enables electrically controlled automatic core extraction, resulting in a high degree of overall process automation and reducing the workload of on-site core extraction engineers. Furthermore, it allows ordinary drilling rigs to perform long-tube core extraction operations, removing previous top-drive limitations and expanding the core extraction market. It should be noted that this application has no special requirements for the control circuit board 8; any control circuit board capable of implementing the control flowchart shown in Figure 7 can be used in this application, and will not be elaborated further.

[0045] In this application, an anchoring component 20 is provided above the inner cylinder 24 of the core-taking inner cylinder 23, which is connected to the upper end of the inner cylinder 23 of the core-taking inner cylinder. The anchoring component 20 can be anchored to the inner wall of the outer cylinder 2. It is understood that the anchoring component in the prior art can be used in this application. Considering the aforementioned hydraulic pump 10 and solenoid valve group 11, the anchoring component in this application is preferably a hydraulic anchoring component in the prior art. The hydraulic oil inlet of the hydraulic anchoring component is connected to the solenoid valve group 11. The hydraulic pump 10 and the solenoid valve group control the hydraulic anchoring component to achieve anchoring and unanchoring. The main column of the continuous core-taking device in this application is seated inside the core-taking drill bit 33. The upper end of the continuous core-taking device is connected to a stabilizer, and the middle is anchored to the inner wall of the outer cylinder 2 by a hydraulic anchor to ensure the stability of the entire column.

[0046] In this application, as shown in Figure 1, the lower end of the outer shell of the anchoring assembly 20 is connected to the inner core cylinder 23, and the upper end is fixed to the outer wall of the bearing cap 17. The lower end of the bearing connecting rod 18 has a protruding positioning shoulder. Bearings 19 are installed at both ends of the axial direction of the positioning shoulder. The upper end of the bearing connecting rod 18 is connected to the crawling outer cylinder 14 by a fixing pin 16 through the connecting cylinder. In this way, the bearing connecting rod 18 and the bearing cap 17 can rotate relative to each other. Understandably, if anchoring failure occurs, the inner core cylinder 23 will rotate synchronously with the inner core cylinder 24 and the core drill bit 33 during the core retrieval process. This could easily cause the inner core cylinder 23 to drive the linear motion mechanism to rotate synchronously. To prevent the linear motion mechanism from rotating with the inner core cylinder 23 and causing damage to the device, a bearing cap 17, a bearing connecting rod 18, and a bearing 19 are provided so that the bearing connecting rod 18 can rotate relative to the bearing cap 17, thereby achieving rotational separation. This effectively prevents the linear motion mechanism from rotating with the inner core cylinder 23 and improves the reliability of protection for the linear motion mechanism.

[0047] In this application, the battery compartment 7, control circuit board 8, hydraulic pump 10, and solenoid valve group 11 can be installed in the casing 6 in sequence. Then, along the direction from the connector 1 to the core drill bit 33, the outer cylinder 2 is provided with the plug 5, casing 6, hydraulic cylinder assembly, crawling outer cylinder 14, anchoring assembly 20, and inner and outer nested core inner cylinder one 23 and core inner cylinder two 24 in sequence. The casing 6 is equipped with the battery compartment 7, control circuit board 8, hydraulic pump 10, and solenoid valve group 11 connected in sequence.

[0048] The plug 5 shown in Figure 1 protects the communication plug and prevents water from entering the instrument. Its streamlined design makes it resistant to erosion. One end of the battery compartment 7 extends into the plug 5 and is equipped with a power plug 4 at that end. The crawler wheel can be moved upwards by external power supply and host computer software to complete the electrically controlled automatic core extraction of the long core. A sensor 3 is installed on the plug 5. The sensor is electrically connected to the power plug. The function of the sensor 3 is to receive signals sent from the ground. This application has no special requirements for the sensor. It can be a commercially available pressure sensor, speed sensor, vibration gauge sensor, etc. This application will not elaborate further on this.

[0049] It should be noted that, unless otherwise specified, conventional techniques in the field are used to seal the various parts of the continuous core sampling device according to actual needs, and this application will not elaborate on this further.

[0050] The implementation process of the continuous coring device shown in Figures 1-3 will be described below through examples, but this application is not limited to these.

[0051] Example

[0052] Taking coring in loose formations as an example, the tool is connected to the continuous coring device shown in Figures 1-3 of this application. After the drill string is lowered and the angular drill pipe is connected, the drilling fluid is circulated once when the drill bit is 1-2m from the bottom of the well. The rotary table is then started, and coring drilling begins with pressure applied. The drilling pressure is 30-80 kN. The drill bit should be fed evenly without intermittent feeding, and slippage or scrambling is strictly prohibited. The drilling fluid discharge rate during coring is 12-24 L / s.

[0053] The ground sends a command to the sensor 3 of the continuous coring device downhole via the mud pulse method in the existing technology. The continuous coring device is powered by a battery. After receiving the command from the ground, the control circuit board 8 drives the hydraulic pump 10 to drive the hydraulic anchoring component to perform anchoring and unlocking. After the coring of the inner cylinder 23 is completed, the inner cylinder 23 is pulled upward by the linear motion mechanism. Then the inner cylinder 24 is prepared for the second coring operation.

[0054] Specifically, after receiving instruction 1, the pressure sensor or vibration sensor installed in the continuous coring device starts the combination of motor 9 and hydraulic pump 10 to pump out high-pressure hydraulic oil, which drives the anchor claw of the hydraulic anchoring component to support it and push it against the inner wall of the outer cylinder 2, thus fixing the inner cylinder of the coring device and preparing for the first coring operation. The coring drill bit 33 is lowered to the bottom to carry out the coring operation. When the advance reaches the length of the inner cylinder 23, the ground hook lifts the entire coring string to cut the core. At this time, the core claw 28 of the inner cylinder of the coring device holds the core tightly. After lifting a certain tonnage, the core is cut off, as shown in Figure 2(a). After the core cutting is completed, the hydraulic pump 10 controls the oil circuit channel to retract the hydraulic anchor claws and release the anchoring state. Through the gear and rack transmission, when the rack moves axially, the gear 15 moves upward along the gear track on the inner wall of the outer cylinder 2, causing the first core-taking cylinder 23 and its inner rock core 27 to move upward together, making room for the second core-taking cylinder 24 and preparing for the second core taking. When the first core-taking cylinder 23 reaches the top relative to the second core-taking cylinder 24, there is a limit step. After the rock core 27 moves to the position, the partition 25 will rotate 90° under the action of the torsion spring. The limit ball 26 is connected to the return spring. The limit ball 26 (which can be a limit steel ball) pops out under the action of the return spring, blocking the partition 25 from continuing to rotate. The gear 15 stops working. At this time, the first core-taking cylinder 23 and the rock core 27 move downward under the action of gravity and sit on the partition 25, completing the sealing and fixing of the core of the first core-taking cylinder 23, as shown in Figure 2(b). After the second coring operation is completed, the ground hook lifts the entire coring string again. At this time, the two core claws 31 of the inner cylinder of the coring tube hold the core tightly. After lifting a certain tonnage, the core is cut, completing the second core cutting, as shown in Figure 2(c). The long cylinder coring operation is now complete. The entire coring string is pulled out, and the core is extracted from the ground. When extracting the core, the upper connector 1 and the plug 5 can be removed. The computer data cable is connected to the power plug 4. The crawler wheel is moved upward through external power supply and upper computer software to complete the electronically controlled automatic core extraction of the long cylinder core, as shown in Figure 3. It can be understood that the power plug 4 can be connected to the computer data cable, which enables power supply through the external power supply of the power plug 4 even when the battery is depleted, improving the reliability and flexibility of use.

[0055] During continuous coring, the coring footage and recovery rate can be monitored using the operator's display instrument installed in the driller's cabin, with a data upload time set to 15 seconds per cycle. Drilling pressure and displacement can be adjusted at any time according to the mechanical drilling speed. Once the core is full and the recovery rate meets the client's requirements, the core is cut, the drill string is smoothly pulled out, the coring tool is retrieved from the wellhead, the inner cylinder is removed and laid flat on the site pipe rack, the core is extracted, cut to the required length, and marked, completing the coring operation. The continuous coring device employs a double core claw cutting structure, achieving continuous coring through a segmented coring process.

[0056] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings; however, this application is not limited thereto. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, this application will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in this application and are all within the protection scope of this application.

Claims

1. A continuous coring device, wherein, The continuous coring device includes an outer cylinder (2) with a connector (1) and a coring drill bit (33) connected to its upper and lower ends respectively. The outer cylinder (2) is provided with a linear motion mechanism and multiple nested coring inner cylinders. The lower end of the outermost coring inner cylinder extends into the coring drill bit (33). In the two adjacent coring inner cylinders, the linear motion mechanism can drive the inner coring inner cylinder to move axially along the outer coring inner cylinder. The linear motion mechanism is connected to the innermost coring inner cylinder. In the two adjacent coring inner cylinders, the inner coring inner cylinder and the outer coring inner cylinder are axially limited by a limiting structure.

2. The continuous coring apparatus according to claim 1, wherein, A partition flipping mechanism is provided between two adjacent core-taking inner cylinders. The partition (25) of the partition flipping mechanism is located between the inner core-taking inner cylinder and the outer core-taking inner cylinder. When the linear motion mechanism drives the inner core-taking inner cylinder to move up to above the partition, the partition (25) can flip to cover the flow section of the outer core-taking inner cylinder.

3. The continuous coring device according to claim 2, wherein, The partition flipping mechanism includes a torsion spring installed on the outer core-taking inner cylinder. The torsion spring is fixed to the inner wall of the outer core-taking inner cylinder by a movable pin. One end of the partition (25) is provided with a mounting hole for installing the torsion spring.

4. The continuous coring apparatus according to claim 3, wherein, The partition flipping mechanism includes a partition limiting structure, which is disposed on the outer core inner cylinder at a position opposite to the torsion spring to restrict the partition (25) from moving downward.

5. The continuous coring apparatus according to claim 1, wherein, The linear motion mechanism includes a hydraulic pump (10) and a hydraulic cylinder assembly connected together. The push rod (12) of the hydraulic cylinder assembly is connected to the rack (13) in the gear rack pair. The inner wall of the outer cylinder (2) is provided with an axially extending gear track adapted to the gear (15) in the gear rack pair. A solenoid valve group (11) is installed on the connecting pipeline between the hydraulic pump (10) and the hydraulic cylinder assembly.

6. The continuous coring apparatus according to claim 5, wherein, The linear motion mechanism includes a crawling outer cylinder (14), in which a radial limiting plate is formed. The radial limiting plate has a through hole for the rack to pass through. The top of the rack (13) is provided with a radially extending limiting head. The limiting head is connected to the push rod (12). A spring is installed between the limiting head and the radial limiting plate.

7. The continuous coring apparatus according to claim 5, wherein, The motor (9) of the hydraulic pump (10) is connected to a control circuit board (8), which is electrically connected to the output terminal installed in the battery compartment (7).

8. The continuous coring apparatus according to claim 1, wherein, The continuous coring device is provided with an anchoring component (20), which is connected to the upper end of the innermost coring cylinder.

9. The continuous coring apparatus according to claim 8, wherein, The anchoring component (20) is a hydraulic anchoring component, and the hydraulic oil inlet of the hydraulic anchoring component is connected to the solenoid valve group (11).

10. The continuous coring apparatus according to claim 8, wherein, The upper end of the anchoring component (20) is mounted on one end of the bearing connecting rod (18) via a bearing (19), and the other end of the bearing connecting rod (18) is connected to the crawling outer cylinder (14).

11. The continuous coring apparatus according to claim 1, wherein, Along the direction from the joint (1) to the core drill bit (33), the outer cylinder (2) is provided with a plug (5), a protective sleeve (6), a hydraulic cylinder assembly, a crawling outer cylinder (14), an anchoring assembly (20), and a multi-layered core drill inner cylinder nested inside and outside. Among them, the protective sleeve (6) is provided with a battery compartment (7), a control circuit board (8), a hydraulic pump (10), and a solenoid valve group (11) connected in sequence.

12. The continuous coring apparatus according to claim 11, wherein, The battery compartment (7) is provided with a power plug (4) at one end near the plug (5), and a sensor (3) is provided on the plug (5), and the sensor (3) is electrically connected to the power plug.

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