Continuous coring device

Abstract

This invention relates to the field of core drilling technology in the oil and gas industry, and discloses a continuous coring apparatus. The continuous coring apparatus includes an outer cylinder with connectors and a coring drill bit connected to its upper and lower ends, respectively. The outer cylinder contains 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. Between adjacent inner coring cylinders, the linear motion mechanism drives the inner inner coring cylinder to move axially along the outer inner coring cylinder. This invention enables continuous coring with a single-cylinder coring operation footage of 20-30 meters or more, improving efficiency by at least 2-3 times compared to existing processes, significantly saving drilling costs and increasing coring efficiency.

Description

Technical Field

[0001] This invention relates to the field of core drilling technology in the oil and gas industry, and specifically to a continuous core drilling device. Background Technology

[0002] 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.

[0003] 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 sampling; ordinary mechanical drilling rigs do not have this capability. Summary of the Invention

[0004] The purpose of this invention 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.

[0005] To achieve the above objectives, the present invention provides a continuous coring device, comprising 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, wherein 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.

[0006] In some embodiments, 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.

[0007] In some embodiments, 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 moves the inner core-taking inner cylinder upward to above the partition, the partition can flip to cover the flow section of the outer core-taking inner cylinder.

[0008] In some embodiments, the partition flipping mechanism includes a torsion spring mounted 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 has a mounting hole for mounting the torsion spring.

[0009] In some embodiments, 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 limit the downward movement of the partition.

[0010] In some embodiments, 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 a rack in a gear and rack pair. The inner wall of the outer cylinder is provided with an axially extending gear track adapted to the gear in the gear and rack pair. A solenoid valve assembly is installed on the connecting pipeline between the hydraulic pump and the hydraulic cylinder assembly.

[0011] In some embodiments, 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, a radially extending limiting head provided at the top of the rack, the limiting head being connected to the push rod, and a spring installed between the limiting head and the radial limiting plate.

[0012] In some embodiments, 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.

[0013] In some embodiments, the continuous coring device is provided with an anchoring assembly connected to the upper end of the innermost coring cylinder.

[0014] In some embodiments, 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.

[0015] In some embodiments, along the direction from the joint to the core drill bit, the outer cylinder is sequentially 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.

[0016] In some embodiments, the battery compartment is provided with a power plug at one end near the plug, and a sensor is provided on the plug, the sensor being electrically connected to the power plug.

[0017] In some embodiments, the upper end of the anchoring assembly is mounted on one end of a bearing connecting rod via a bearing sleeve, and the other end of the bearing connecting rod is connected to the crawling outer cylinder.

[0018] Through the above technical solution, the inner and outer core-taking inner cylinders nested in the continuous coring device of the present invention can use a linear motion mechanism to drive the innermost core-taking inner cylinder and the rock core therein 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. 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

[0019] Figure 1 This is a schematic diagram of the structure of a continuous core-taking device according to one embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the continuous core sampling principle of one embodiment of the present invention; Figure 3 This is a schematic diagram of the electrically controlled output principle of one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a partition flipping mechanism according to one embodiment; Figure 5 yes Figure 4 A diagram illustrating another state; Figure 6 yes Figure 1 Schematic diagram of the structure of a gear and rack pair; Figure 7 The control flowchart is for the control circuit board.

[0020] Explanation of reference numerals in the attached figures 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 thread structure; 31 Core cylinder - Core claw; 32 Core cylinder - Guide core; 33 Core drill bit. Detailed Implementation

[0021] The specific embodiments of the present invention 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 the present invention.

[0022] In this invention, unless otherwise stated, "inner" and "outer" refer to the inner and outer contours of each component itself, while "upper," "lower," "top," and "bottom" are generally terms used to describe the relative positional relationships of the components in relation to the directions shown in the accompanying drawings or in the vertical, perpendicular, or gravitational directions. For ease of description, the specific embodiments of this invention use... Figures 1-6 The continuous core-taking device with two nested core-taking inner cylinders is shown to illustrate the advantages of the present invention, but the present invention is not limited thereto.

[0023] This invention 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.

[0024] Specifically, such as Figure 2 As shown in (a), after the inner core-retrieving cylinder 23 completes one core retrieval, the linear motion mechanism pulls the inner core-retrieving cylinder 23 upwards to the position shown in (a). Figure 2 As shown in (b), the inner core cylinder 24 performs a second core sampling operation. This invention can achieve continuous core sampling and the single core sampling 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 core sampling efficiency.

[0025] 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 invention, and will not be described in detail here. Figure 1 As shown, the inner cylinder 24 of the core adopts the existing length adjustment and buckle structure 30 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.

[0026] It is understood that, in order to adapt to drilling at different depths, the outer cylinder 2 in this invention can be formed by combining multiple cylinder sections.

[0027] In this invention, the continuous coring device includes a partition flipping mechanism. In the initial state, as follows: Figure 2 As shown in (a), the partition 25 of the partition flipping mechanism is located between the first core-taking inner cylinder 23 and the second core-taking inner cylinder 24. When the first core-taking inner cylinder 23 completes one core taking, the linear motion mechanism drives the first core-taking inner cylinder 23 to move upward along the axial direction of the second core-taking inner cylinder 24 to above the partition 25, and then the linear motion mechanism stops working. Figure 2 As shown in (b), the partition 25 can be rotated 90° to cover the flow section of the inner core cylinder 24. At this time, the inner core cylinder 23 and the core 27 move downward under the action of gravity and sit on the partition 25, as shown in (b). Figure 2 As shown in (c), the sealing and fixing of the inner core cylinder 23 has been completed.

[0028] It should be noted that there are various partition flipping mechanisms capable of achieving partition 25 flipping. The following is an illustrative example, but not limited to this one. For example, such as... Figures 4-5 As shown, the partition flipping mechanism includes a torsion spring, which is fixed to the inner wall of the core-taking inner cylinder 24 by a movable pin. One end of the partition 25 has a mounting hole for installing the torsion spring. In the initial state, as shown... Figure 2 (a) and Figure 4 As shown, the partition 25 is limited by the first core-removing inner cylinder 23 and the second core-removing inner cylinder 24. When the first core-removing inner cylinder 23 moves upward into position, as... Figure 2 (b) and Figure 5 The partition shown is rotated ninety degrees.

[0029] Because the partition 25 needs to bear the weight of the inner core cylinder 23 and the core 27, there is a problem of the partition 25 sinking. Therefore, 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 extending inward from the inner wall of the inner core cylinder 24 to support the partition 25, or... Figure 4 and Figure 5As shown, a limiting ball 26 is installed on the inner wall of the inner core cylinder 24 via a return spring. The partition 25 is rotated 90 degrees. After rotating 90 degrees, the limiting ball 26 limits the partition 25, thereby achieving stable sealing and fixation of the inner core cylinder 23.

[0030] In this invention, to prevent the inner core-removing cylinder 24 from being pulled out when the inner core-removing cylinder 23 is pulled upwards, the inner core-removing cylinder 23 and the inner core-removing 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 upwards. The following is an illustrative description, but it is not limited to these. For example, such as... Figure 2 As shown, a limiting step is formed inward at the upper end of the inner core cylinder 24, and correspondingly, a boss that matches the limiting step is formed on the outer wall surface of the lower end of the inner core cylinder 23.

[0031] 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 the present invention. For example, such as Figure 1 As shown, the linear motion mechanism includes a hydraulic pump 10 and a hydraulic cylinder assembly connected together. To achieve smooth lifting, a rack and pinion pair can be used. Specifically, the push rod 12 of the hydraulic cylinder assembly is connected to the rack 13 in the rack and pinion pair, as shown below. Figure 6 As shown, the gear rack pair is symmetrically equipped with at least two gears, including at least one driven gear and a driving gear that meshes with the rack. The inner wall of the outer cylinder 2 is provided with an axially extending gear track that is adapted to the gear 15. In this way, on the one hand, it can realize electrically controlled automatic core extraction, with a high degree of overall process 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.

[0032] 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 invention, 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 invention.

[0033] 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.

[0034] In this invention, 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 limitations of top-drive operations and expanding the core extraction market. It should be noted that this invention has no special requirements for the control circuit board 8 and can achieve… Figure 7 The control circuit boards shown in the control flowchart can all be used in this invention, and will not be described in detail here.

[0035] In this invention, 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 invention. Considering the aforementioned hydraulic pump 10 and solenoid valve group 11, the anchoring component of this invention 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 tube of the continuous core-taking device of this invention sits 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 tube.

[0036] In this invention, such as Figure 1 As shown, 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 through the connecting cylinder using a fixing pin 16. In this way, the bearing connecting rod 18 and the bearing cap 17 can rotate relative to each other.

[0037] In this invention, the battery compartment 7, control circuit board 8, hydraulic pump 10, and solenoid valve group 11 can be installed sequentially in the casing 6. Then, along the direction from the connector 1 to the core drill bit 33, the outer cylinder 2 is sequentially provided with a 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. 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.

[0038] Figure 1The plug 5 shown can protect the communication plug and prevent water from entering the instrument. It is streamlined and erosion resistant. One end of the battery compartment 7 extends into the plug 5 and is equipped with a power plug 4 at this end. It can be controlled by external power supply and host computer software to move the crawling wheels upward and complete the electronically controlled automatic core extraction of the long core. The plug 5 is equipped with a sensor 3, which is electrically connected to the power plug. The function of the sensor 3 is to receive signals sent from the ground. This invention has no special requirements for the sensor. It can be a commercially available pressure sensor, speed sensor, vibration gauge sensor, etc. This invention will not elaborate on this.

[0039] It should be noted that, unless otherwise specified, conventional techniques in the field are used to seal various parts of the continuous core-taking device according to actual needs, and this invention will not elaborate on this further.

[0040] The following will illustrate this through examples. Figures 1-3 The implementation process of the continuous core sampling device shown is illustrated, but the present invention is not limited thereto.

[0041] Example Taking coring from loose strata as an example, the tool is connected to the present invention as follows: Figures 1-3 After the continuous coring system is set up and the swivel drill pipe is connected, the drilling fluid is circulated once when the drill bit is 1-2 meters from the bottom of the well. The rotary table is then started, and coring begins with pressure applied at a pressure of 30-80 kN. The feed rate should be uniform, without intermittent feed, and slippage or scrambling of the drill bit is strictly prohibited. The drilling fluid flow rate during coring is 12-24 L / s.

[0042] 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.

[0043] Specifically, after receiving instruction 1, the pressure sensor or vibration sensor installed inside the continuous coring device starts the combination of motor 9 and hydraulic pump 10, pumping out high-pressure hydraulic oil to drive the anchor claws of the hydraulic anchoring assembly to support the inner wall of the outer cylinder 2, thus fixing the inner cylinder 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 depth 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 holds the core tightly, and after being lifted by a certain tonnage, the core is cut off. Figure 2(a) After core cutting is completed, the hydraulic pump 10 controls the oil circuit channel, causing the hydraulic anchor claws to retract 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 is raised to 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. 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 core cylinder grip the core tightly. After being lifted to a certain tonnage, the core is cut, completing the second coring operation. Figure 2 (c) At this point, the long core sampling operation is complete. The entire core string is retrieved, and the core is extracted to the ground. During extraction, the upper connector 1 and plug 5 can be removed. Connect the computer data cable to the power plug 4, and control the crawler wheels to move upwards via external power supply and host computer software, completing the electrically controlled automatic core extraction of the long core. Figure 3 As shown.

[0044] 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 the 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 during coring. 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 brought out of the wellhead, the inner cylinder is removed and laid flat on the site pipe rack, the core is extracted, cut to the required length, marked, and the coring operation is complete.

[0045] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A continuous coring device characterized by, 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 along the axial direction of the outer coring inner cylinder.

2. The continuous coring device of claim 1, wherein, The linear motion mechanism is connected to the innermost core-taking inner cylinder. In the 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.

3. The continuous coring device of claim 1 or 2, 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.

4. The continuous coring device of claim 3, 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.

5. The continuous coring apparatus of claim 4, 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.

6. The continuous coring apparatus of 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.

7. The continuous coring device of claim 6, 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.

8. The continuous coring apparatus of claim 6, 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).

9. The continuous coring apparatus of 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.

10. The continuous coring device of claim 9, 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).

11. The continuous coring apparatus of 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 of 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.

13. The continuous coring apparatus of claim 9, 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).

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