A core capturing device based on ultra-short radius and multi-direction coring

Abstract

This invention discloses a core capture device based on ultra-short radius and multi-directional coring, belonging to the field of core capture technology. It includes an ultra-short radius directional drill bit, a multi-directional capture chamber, a micro-steering joint, a chamber switching valve assembly, and an ultra-short radius measurement and control terminal. The ultra-short radius directional drill bit is composed of a hemispherical cutterhead and an elastic deflection base. This invention solves the problem of excessive radial dimensions in traditional devices through structural miniaturization and power transmission optimization. It is adaptable to ultra-short radius wellbore operation scenarios such as radial branch wells and sidetracking infill wells. By overcoming the limitations of traditional unidirectional sampling, it can obtain core samples from reservoirs in different directions, accurately reflecting the anisotropy of physical properties such as permeability and porosity, supporting fine reservoir evaluation. For complex conditions such as shale and fractured formations, the sealing and jamming control design of the capture mechanism is optimized to reduce core loss, fracture, and drilling fluid contamination, ensuring core integrity.

Description

Technical Field

[0001] This invention relates to the field of core capture technology, and in particular to a core capture device based on ultra-short radius and multi-directional coring. Background Technology

[0002] As shallow reserves of strategic resources such as oil, gas, and minerals are gradually depleted, the focus of exploration and development is rapidly shifting to deeper and more complex formations. Ultra-short radius drilling (such as radial branch wells and sidetracking infill wells) has become a key technology in resource exploration due to its ability to efficiently develop remaining reservoirs and accurately detect reservoir boundaries. However, core samples, as the "first-hand data" for formation property analysis and reservoir evaluation, directly determine the accuracy of resource exploration. Traditional core capture devices have revealed significant shortcomings in ultra-short radius operation scenarios and complex formation conditions, making it difficult to meet current exploration needs. In the exploration of hard rock, fractured, or heterogeneous reservoirs, core sampling and capture are the core links connecting geological analysis and engineering construction. The effectiveness of auxiliary technologies such as microwave pretreatment and directional drilling ultimately needs to be verified through data analysis of complete core samples. It is important to distinguish that only capture devices with ultra-short radius adaptability and multi-directional coring capabilities can balance coring efficiency and formation information integrity in narrow-space operations. Ultra-short radius adaptability relies on structural miniaturization and optimized power transmission, while multi-directional coring requires overcoming the limitations of traditional unidirectional sampling. These two characteristics are key elements that are generally lacking in existing devices. Traditional devices either cannot enter ultra-short radius wellbores due to their excessively large radial dimensions, or they can only achieve coring in a single direction, making it difficult to reflect the anisotropic characteristics of reservoir permeability and porosity.

[0003] However, for complex reservoirs such as shale and tight sandstone, or formations containing fractured rocks and weak interlayers, even with conventional coring tools, problems such as core loss, breakage, or drilling fluid contamination during capture often occur. This is especially pronounced in the limited space of ultra-short radius wellbores, where core jamming and capture mechanism seal failure are more significant. Overall, current research focuses primarily on optimizing coring techniques in conventional wellbores, neglecting the specific requirements of multi-directional coring in ultra-short radius operations and the stability mechanisms of core capture in complex formations. Therefore, it is necessary to design a core capture device based on ultra-short radius and multi-directional coring to address the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a core capture device based on ultra-short radius and multi-directional coring, so as to solve the problem mentioned in the background art that coring equipment cannot achieve multi-directional accurate coring based on ultra-short radius.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a core capture device based on ultra-short radius and multi-directional coring, comprising an ultra-short radius directional drill bit, a multi-directional capture chamber, a micro steering joint, a chamber switching valve group, and an ultra-short radius measurement and control terminal;

[0006] The ultra-short radius reversing drill bit is composed of a hemispherical cutter head and an elastic deflection base. Diamond composite teeth are uniformly fixed on the outer side of the hemispherical cutter head. The ultra-short radius reversing drill bit is connected to the front end of the multi-directional capture chamber through a quick-connect buckle.

[0007] The multi-directional capture chamber is evenly provided with three sets of core tubes in the circumference. The core tubes are all provided with spring claws and buffer bushings inside. The side walls of the multi-directional capture chamber are all provided with hydraulic rotation mechanisms.

[0008] Two sets of micro hydraulic push rods are provided on one side of the micro steering joint, and an angle sensor is provided inside the micro steering joint.

[0009] The compartment switching valve assembly consists of a three-way hydraulic directional valve and a pressure sensor. One end of the compartment switching valve assembly is connected to a micro steering joint, and the other end of the compartment switching valve assembly is connected to a multi-directional capture compartment.

[0010] The ultra-short radius measurement and control terminal consists of an ultra-short radius attitude sensor, a channel control module, and a data transmission unit.

[0011] Furthermore, the ultra-short radius directional drill bit features a hollow dual-channel design, with the hollow dual channels serving as pathways for drilling fluid circulation and core entry into the multi-directional capture chamber, respectively. The hemispherical cutterhead has a 15° deflectable structure.

[0012] Furthermore, the circumferential angle between the core tubes is 120°, and the core tubes can independently complete the core capture and fixation operations.

[0013] Furthermore, the axial length of the micro steering joint is ≤0.3m, and it can achieve a radial deflection of ±30°. The micro steering joint adopts a titanium alloy hinged structure.

[0014] Furthermore, the built-in angle sensor of the micro steering joint is linked with the ultra-short radius measurement and control terminal to provide real-time feedback on the deflection attitude and achieve ultra-short radius trajectory precision control.

[0015] Furthermore, the chamber switching valve group receives instructions from the ultra-short radius measurement and control terminal to precisely switch the coring channels of the multi-directional capture chamber and monitor the coring pressure of each channel in real time.

[0016] Furthermore, the outer shell of the ultra-short radius measurement and control terminal is made of pressure-resistant ceramic material to adapt to downhole pressure of 50MPa.

[0017] Furthermore, the hydraulic rotation mechanism of the multi-directional capture chamber, in conjunction with the ultra-short radius steering action, can obtain core samples in different radial directions within the same well section.

[0018] The ultra-short radius multi-directional centering method includes the following steps:

[0019] Step 1: Lower the device to the target well section, collect the wellbore attitude through the ultra-short radius telemetry and control terminal, and locate the ultra-short radius operation area;

[0020] Step 2: The micro steering joint receives the command from the ultra-short radius measurement and control terminal, and drives the ultra-short radius reversing drill bit to complete an ultra-short radius turn with a curvature radius of 0.3-0.5m, aligning with the radial direction of the target;

[0021] Step 3: Switch the chamber switching valve group to the first core sampling channel. The corresponding core tube of the multi-directional capture chamber extends and retracts after completing the core capture with the ultra-short radius reversing drill bit. The spring chuck locks the core.

[0022] Step 4: The compartment switching valve group is switched sequentially to the 2nd and 3rd coring channels, and the coring operation is repeated to obtain core samples from multiple directions in the same well section;

[0023] Step 5: After core sampling is completed, the device is reset, lifted to the ground, and multiple sets of core samples are taken out.

[0024] Furthermore, the chamber switching valve assembly continuously monitors the core sampling pressure during the core sampling process to prevent core blockage.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] (1) Adaptability to ultra-short radius: This invention solves the problem of excessive radial size of traditional devices by miniaturizing the structure and optimizing power transmission, and can be adapted to ultra-short radius well operation scenarios such as radial branch wells and side-drilling infill wells;

[0027] (2) Multi-directional core sampling capability: By breaking through the limitations of traditional unidirectional sampling, this invention can obtain core samples from reservoirs in different directions, accurately reflecting the anisotropy of physical properties such as permeability and porosity, and supporting the fine evaluation of reservoirs;

[0028] (3) Core capture stability: This invention optimizes the sealing and jamming control design of the capture mechanism for complex conditions such as shale and fractured formations, reducing core loss, fracture and drilling fluid contamination, and ensuring core integrity;

[0029] (4) High-efficiency exploration support: The present invention integrates the functions of "narrow space operation" and "multi-dimensional sampling", which can avoid the drawbacks of traditional equipment to operate multiple times, reduce exploration costs, shorten the cycle, and provide reliable data for the identification of reservoir sweet spots. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] The reference numerals in the diagram are as follows: 1. Ultra-short radius reversing drill bit; 2. Hemispherical cutterhead; 3. Elastic deflection base; 4. Diamond composite blade teeth; 5. Quick-connect buckle; 6. Multi-directional capture chamber; 7. Core tube; 8. Spring chuck; 9. Hydraulic rotation mechanism; 10. Miniature steering joint; 11. Hydraulic push rod; 12. Chamber switching valve assembly; 13. Hydraulic directional valve; 14. Ultra-short radius measurement and control terminal; 15. Ultra-short radius attitude sensor; 16. Channel control module; 17. Data transmission unit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1 The present invention provides an embodiment of a core capture device based on ultra-short radius and multi-directional coring, comprising an ultra-short radius directional drill bit 1, a multi-directional capture chamber 6, a micro steering joint 10, a chamber switching valve group 12, and an ultra-short radius measurement and control terminal 14.

[0035] The ultra-short radius reversing drill bit 1 is composed of a hemispherical cutter head 2 and an elastic deflection base 3. Diamond composite blades 4 are uniformly fixed on the outer side of the hemispherical cutter head 2. The ultra-short radius reversing drill bit 1 is connected to the front end of the multi-directional capture chamber 6 through a quick-connect buckle 5.

[0036] The ultra-short radius reversible drill bit 1 is a hollow dual-channel design. The hollow dual channels are used for drilling fluid circulation and core entry into the multi-directional capture chamber 6, respectively. The hemispherical cutterhead 2 has a 15° deflectable structure.

[0037] Specifically, such as Figure 1As shown, during use, the ultra-short radius reversing drill bit 1 adopts a combination design of a hemispherical cutterhead 2 and an elastic deflection base 3, along with a 15° deflectable structure and diamond composite blades 4, which can achieve efficient small-radius rock breaking operations with a curvature radius ≤0.5m. The hollow dual-channel design can simultaneously complete drilling fluid circulation and core delivery, ensuring smooth downhole operations and core integrity. The quick-connect buckle 5 connection method improves assembly efficiency and ensures stable torque transmission during small-radius turning, avoiding loose connections. This drill bit effectively solves the problem that traditional drill bits cannot turn radially in extremely small spaces, improves the operation capability of small-radius coring near the well wall, reduces rock breaking resistance during turning, extends downhole service life, and provides stable and reliable front-end operation support for ultra-short radius multi-directional coring.

[0038] Three sets of core-collecting tubes 7 are evenly arranged around the circumference of the multi-directional capture chamber 6. The core-collecting tubes 7 are all equipped with spring claws 8 and buffer bushings inside. The side walls of the multi-directional capture chamber 6 are all equipped with hydraulic rotation mechanisms 9.

[0039] The circumferential angle between the core tubes 7 is 120°. The core tubes 7 can independently complete the core capture and fixation operation. The hydraulic rotation mechanism 9 of the multi-directional capture chamber 6, in conjunction with the ultra-short radius steering action, can obtain core samples in different radial directions in the same well section.

[0040] Specifically, such as Figure 1 As shown, during use, three sets of independent coring tubes 7 with an included angle of 120° are evenly arranged in the 6 directions around the multi-directional capture chamber. Each coring tube 7 has a built-in spring claw 8 and a buffer bushing, which can independently complete the core grabbing, fixing and storage without interfering with the operation process. This enables multi-directional synchronous coring preparation in a single well section. The independent coring structure improves the coring success rate and core integrity. The buffer bushing can reduce the breakage and loss of the core during the entry and storage process. The spring claw 8 realizes automatic locking of the core to prevent the core from falling off. This design greatly improves the efficiency of multi-directional coring, and multiple sets of samples can be obtained without multiple tool lowering, reducing downhole operation time and construction risks, and meeting the multi-dimensional sampling needs of complex formations.

[0041] Furthermore, the hydraulic rotation mechanism 9 on the side wall of the multi-directional capture chamber 6 can precisely coordinate with the ultra-short radius steering action of the device to drive the chamber to rotate and adjust the orientation of the core tube 7, so that the three sets of core tubes 7 can be aligned with different radial target areas in sequence, efficiently obtaining multi-directional core samples within the same well section. The rotation mechanism operates smoothly and is precisely positioned. It can work in conjunction with the micro-steering joint 10 and the measurement and control terminal to achieve automated and precise adjustment of the core orientation. This mechanism breaks through the limitation of traditional core tools that can only sample in a single orientation, realizes multi-dimensional and multi-directional core sampling in a single well section, improves the comprehensiveness and representativeness of geological sampling, and provides more complete data support for reservoir exploration and geological diagnosis.

[0042] Two sets of miniature hydraulic push rods 11 are provided on one side of the miniature steering joint 10 for driving, and an angle sensor is provided inside the miniature steering joint 10.

[0043] The axial length of the miniature steering joint 10 is ≤0.3m, and it can achieve radial deflection of ±30°. The miniature steering joint 10 adopts a titanium alloy hinge structure.

[0044] Specifically, such as Figure 1 As shown, during use, the micro steering joint 10 adopts a titanium alloy articulated structure and is driven by two sets of micro hydraulic push rods 11. It can achieve ±30° radial deflection within an extremely small axial length of ≤0.3m, perfectly adapting to the needs of ultra-short radius steering operations. It breaks through the technical limitations of traditional steering joints, which are large in size and large in deflection radius. The titanium alloy material has high strength, corrosion resistance, and high pressure resistance, making it suitable for complex and harsh downhole environments. Its extremely small size allows it to move flexibly in narrow wellbore spaces. This joint enables the device to accurately change radial direction in the near-wellbore area, providing stable power and attitude support for the drill bit to align with different coring positions, and greatly improving the flexibility and reliability of ultra-short radius trajectory control.

[0045] The built-in angle sensor of the miniature steering joint 10 is linked with the ultra-short radius measurement and control terminal 14 to provide real-time feedback on the deflection attitude and achieve ultra-short radius trajectory precision control.

[0046] Specifically, such as Figure 1 As shown, during use, the built-in angle sensor of the miniature steering joint 10 is linked with the ultra-short radius measurement and control terminal 14 in real time. It can continuously collect and feed back joint deflection angle and attitude data, realize closed-loop precision control of ultra-short radius running trajectory. The angle sensor transmits the downhole attitude information to the measurement and control terminal in real time. The terminal quickly calculates and adjusts the control commands to correct the deflection deviation and ensure that the turning radius is stably controlled within 0.5m, thereby improving the accuracy of coring azimuth positioning. This linkage mechanism solves the problem of inaccurate monitoring of downhole turning attitude, avoids trajectory deviation leading to coring failure, realizes intelligent and high-precision control of ultra-short radius steering, and ensures the accuracy of multi-directional coring azimuth.

[0047] The compartment switching valve assembly 12 consists of a three-way hydraulic directional valve 13 and a pressure sensor. One end of the compartment switching valve assembly 12 is connected to the miniature steering joint 10, and the other end of the compartment switching valve assembly 12 is connected to the multi-directional capture compartment 6.

[0048] The compartment switching valve group 12 receives instructions from the ultra-short radius measurement and control terminal 14 to precisely switch the coring channels of the multi-directional capture compartment 6 and monitor the coring pressure of each channel in real time.

[0049] Specifically, such as Figure 1As shown, during use, the three-way hydraulic directional valve 13 and pressure sensor are integrated through the compartment switching valve group 12. After receiving the command from the measurement and control terminal, the three sets of coring channels of the multi-directional capture compartment 6 can be quickly and accurately switched to achieve orderly conversion of the coring position. The valve group monitors the coring pressure of each channel in real time during operation. When the pressure is abnormal, it can provide timely feedback and adjustment, effectively avoiding failures such as core blockage and channel blockage, and ensuring the continuous and stable coring process. As the core control component of the coring channel, the valve group realizes the automatic switching and safety monitoring of multi-channel coring, improves the smoothness and reliability of multi-directional coring operations, and reduces the downhole failure rate and processing cost.

[0050] The ultra-short radius measurement and control terminal 14 consists of an ultra-short radius attitude sensor 15, a channel control module 16, and a data transmission unit 17.

[0051] The housing of the ultra-short radius telemetry and control terminal 14 is made of pressure-resistant ceramic material to adapt to downhole pressure of 50MPa;

[0052] Specifically, such as Figure 1 As shown, during use, the ultra-short radius measurement and control terminal 14 adopts a pressure-resistant ceramic shell, which can stably adapt to the 50MPa downhole high-pressure environment. This ensures that the ultra-short radius attitude sensor 14, channel control module 16 and data transmission unit 17 inside the terminal operate normally under high pressure and high corrosion conditions, and are not affected by external environmental interference. The pressure-resistant structure improves the downhole service life and working stability of the terminal, ensuring that it can reliably complete attitude acquisition, command transmission and data feedback functions for a long time. This design solves the problems of insufficient downhole pressure resistance and easy damage of traditional control terminals, and provides a safe and stable control center for the entire ultra-short radius multi-directional coring device, ensuring continuous and controllable downhole operations.

[0053] The ultra-short radius multi-directional centering method includes the following steps:

[0054] Step 1: Lower the device to the target well section and use the ultra-short radius measurement and control terminal 14 to collect the wellbore attitude and locate the ultra-short radius operation area;

[0055] Step 2: The micro steering joint 10 receives the command from the ultra-short radius measurement and control terminal 14 and drives the ultra-short radius reversing drill bit 1 to complete an ultra-short radius steering with a curvature radius of 0.3-0.5m, aligning itself with the radial orientation of the target;

[0056] Step 3: The compartment switching valve group 12 switches to the first core sampling channel, the corresponding core sampling tube 7 of the multi-directional capture compartment 6 extends, and after the core capture is completed with the ultra-short radius reversing drill bit 1, it retracts. The spring claw 8 locks the core. The compartment switching valve group 12 continuously monitors the core sampling pressure during the core sampling process to avoid core blockage failure.

[0057] Step 4: Switch the compartment switching valve group 12 to the 2nd and 3rd coring channels in sequence, repeat the coring operation, and obtain core samples from multiple directions in the same well section;

[0058] Step 5: After core sampling is completed, the device is reset, lifted to the ground, and multiple sets of core samples are retrieved;

[0059] In summary, this invention, through the coordinated operation of multiple components, constructs a downhole core sampling system adapted to small spaces, multiple dimensions, and high precision. It enables ultra-short radius radial turning with a curvature radius ≤0.5m and automatic core sampling from multiple azimuths within the same well section. It possesses core functions such as precise attitude control, independent multi-channel core sampling, adaptation to downhole high-pressure environments, and real-time data monitoring and transmission. It can efficiently complete core collection work in scenarios such as fracture and vault exploration of tight oil and gas reservoirs, near-wellbore sampling in old wells, and geological diagnosis of complex fault blocks. The overall solution significantly improves the operational accuracy and success rate of small-radius core sampling, reduces the number of downhole operations and risks, lowers operating costs, and yields core samples with high integrity and strong azimuth representativeness. This provides high-quality data support for oil and gas reservoir evaluation, remaining reserve assessment, and geological structure analysis, effectively solving the technical challenges of traditional core sampling techniques in small spaces, near-wellbore, and multi-dimensional sampling. It possesses significant technological advancements and engineering application value.

[0060] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A core capture device based on ultra-short radius and multi-directional coring, comprising an ultra-short radius directional drill bit (1), a multi-directional capture chamber (6), a micro steering joint (10), a chamber switching valve group (12), and an ultra-short radius measurement and control terminal (14). Its features are: The ultra-short radius reversing drill bit (1) is composed of a hemispherical cutter head (2) and an elastic deflection base (3). Diamond composite blades (4) are uniformly fixed on the outer side of the hemispherical cutter head (2). The ultra-short radius reversing drill bit (1) is connected to the front end of the multi-directional capture chamber (6) through a quick-connect buckle (5). The multi-directional capture chamber (6) is uniformly provided with three sets of core-collecting tubes (7) in the circumference. The core-collecting tubes (7) are all provided with spring claws (8) and buffer bushings inside. The side walls of the multi-directional capture chamber (6) are all provided with hydraulic rotation mechanisms (9). Two sets of micro hydraulic push rods (11) are provided on one side of the micro steering joint (10) for driving, and an angle sensor is provided inside the micro steering joint (10); The compartment switching valve group (12) consists of a three-way hydraulic directional valve (13) and a pressure sensor. One end of the compartment switching valve group (12) is connected to the micro steering joint (10), and the other end of the compartment switching valve group (12) is connected to the multi-directional capture chamber (6). The ultra-short radius measurement and control terminal (14) consists of an ultra-short radius attitude sensor (15), a channel control module (16), and a data transmission unit (17).

2. The core capture device based on ultra-short radius and multi-directional coring according to claim 1, characterized in that: The ultra-short radius directional drill bit (1) is a hollow double-channel design. The hollow double channels are used for drilling fluid circulation and core entry into the multi-directional capture chamber (6), respectively. The hemispherical cutterhead (2) has a 15° deflectable structure.

3. The core capture device based on ultra-short radius and multi-directional coring according to claim 1, characterized in that: The circumferential angle between the core tubes (7) is 120°, and the core tubes (7) can independently complete the core capture and fixation operation.

4. A core capture device based on ultra-short radius and multi-directional coring as described in claim 1, characterized in that: The axial length of the micro steering joint (10) is ≤0.3m, and it can achieve a radial deflection of ±30°. The micro steering joint (10) adopts a titanium alloy hinge structure.

5. A core capture device based on ultra-short radius and multi-directional coring according to claim 1, characterized in that: The built-in angle sensor of the micro steering joint (10) is linked with the ultra-short radius measurement and control terminal (14) to provide real-time feedback on the deflection attitude and achieve ultra-short radius trajectory precision control.

6. A core capture device based on ultra-short radius and multi-directional coring according to claim 1, characterized in that: The compartment switching valve group (12) receives instructions from the ultra-short radius measurement and control terminal (14) to accurately switch the coring channel of the multi-directional capture compartment (6) and monitor the coring pressure of each channel in real time.

7. A core capture device based on ultra-short radius and multi-directional coring according to claim 1, characterized in that: The outer shell of the ultra-short radius measurement and control terminal (14) is made of pressure-resistant ceramic material to adapt to downhole pressure of 50MPa.

8. A core capture device based on ultra-short radius and multi-directional coring according to claim 1, characterized in that: The hydraulic rotation mechanism (9) of the multi-directional capture chamber (6) is combined with the ultra-short radius steering action to obtain core samples in different radial directions in the same well section.

9. A method for ultra-short radius multi-directional coring based on the device described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Lower the device to the target well section, collect the wellbore attitude through the ultra-short radius measurement and control terminal (14), and locate the ultra-short radius operation area; Step 2: The micro steering joint (10) receives the command from the ultra-short radius measurement and control terminal (14) and drives the ultra-short radius reversing drill bit (1) to complete the ultra-short radius steering with a curvature radius of 0.3-0.5m and align with the radial orientation of the target; Step 3: The chamber switching valve group (12) switches to the first core sampling channel, the corresponding core sampling tube (7) of the multi-directional capture chamber (6) extends, and after the core capture is completed with the ultra-short radius reversing drill bit (1), it retracts, and the spring chuck (8) locks the core. Step 4: Switch the compartment switching valve group (12) to the 2nd and 3rd core sampling channels in sequence, repeat the core sampling operation, and obtain core samples from multiple directions in the same well section; Step 5: After core sampling is completed, the device is reset, lifted to the ground, and multiple sets of core samples are taken out.

10. A core capture device based on ultra-short radius and multi-directional coring according to claim 9, characterized in that: The chamber switching valve group (12) continuously monitors the core sampling pressure during the core sampling process to avoid core blockage failure.

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