Coring method for fractured zone stratum

Abstract

The invention relates to the technical field of geological exploration, and provides a coring method for fractured zone strata. The coring method for the fractured zone stratum comprises the following steps that S1, a first channel is obtained in a rock stratum till the first channel reaches the fractured zone stratum; s2, a second channel is obtained in the fracture zone stratum along the first channel, and the diameter of the second channel is smaller than that of the first channel; s3, a coagulant is injected into the fractured zone stratum; and S4, a sample core is drilled in the fractured zone stratum along the first channel. According to the method, the defects that in the prior art, drilling coring is influenced by the stratum geological characteristics of the fractured zone, and the coring rate is very low are overcome, and the method capable of improving the drilling coring rate of the stratum of the fractured zone is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of geological exploration, and in particular to a coring method for a fractured zone stratum. Background Art

[0002] Broken zone strata refer to geological bodies where rocks are broken, fragmented, or even pulverized due to geological tectonic movements (such as fault activity, folding, etc.). There are a large number of cracks and faults inside the rocks of these strata, which makes the rock structure loose and greatly reduces its strength. And due to the presence of cracks, the broken zone strata often have high permeability and easily become channels for groundwater flow.

[0003] Drilling and coring is the most direct and intuitive method to study the lithology of the formation. In the intact section of the formation, the coring rate is generally high, but due to the influence of the geological characteristics of the formation in the broken zone, coring is very difficult, resulting in a very low coring rate. Summary of the invention

[0004] The present invention provides a coring method for a broken zone stratum, which is used to solve the defect in the prior art that the coring rate of drilling holes is very low due to the influence of the geological characteristics of the broken zone stratum, and realizes a method that can improve the coring rate of drilling holes in the broken zone stratum.

[0005] The present invention provides a coring method for a fractured zone stratum, comprising: Acquire a first channel in the rock formation until the first channel reaches the fractured zone formation; Acquire a second channel in the fracture zone formation along the first channel, wherein the diameter of the second channel is smaller than the diameter of the first channel; injecting a coagulant into the fracture zone formation; A sample core is drilled in the fracture zone formation along the first channel.

[0006] According to a coring method for a broken zone formation provided by the present invention, after the step of obtaining a first channel in the rock formation until the first channel reaches the broken zone formation is completed, the first channel is expanded.

[0007] According to a coring method for a broken zone formation provided by the present invention, obtaining a first channel in the rock formation until the first channel reaches the broken zone formation includes: Select the target location; Obtaining the hardness and structure of rocks around the target location; Selecting a drilling tool according to the hardness and structure of the rock at the target location; A hole is drilled at the target location to obtain the first channel.

[0008] According to a coring method for a broken zone formation provided by the present invention, the step of obtaining a first channel in the rock formation until the first channel reaches the broken zone formation further comprises: In the process of acquiring the first channel, checking the depth and inclination of the first channel to ensure that the first channel can accurately reach the predetermined fracture zone formation; The data during the drilling process are recorded, including rock formation changes and drilling speed.

[0009] According to a coring method for a broken zone formation provided by the present invention, obtaining a second channel in the broken zone formation along the first channel includes: A guide component is installed inside the first channel, wherein the guide component has a guide channel coaxially arranged with the first channel; The drilling device drills downward along the guide channel until penetrating the fracture zone stratum.

[0010] According to a coring method for a broken zone formation provided by the present invention, the guide component comprises: A plurality of guide rings are arranged at intervals along the height direction of the first channel, and the inner rings of the plurality of guide rings constitute the guide channel; A connecting piece, provided on the guide ring, used to connect a plurality of guide rings; A fixing member is arranged on the guide ring at the end portion and is used for fixing the guide ring.

[0011] According to a coring method for a broken zone formation provided by the present invention, the inner ring of the guide ring is provided with a plurality of rolling bodies, and the plurality of rolling bodies are arranged at intervals.

[0012] According to a coring method for a broken zone formation provided by the present invention, injecting a coagulant into the broken zone formation comprises: According to the characteristics of the fractured zone strata, a coagulant is selected that can effectively consolidate loose particles and will not have a negative impact on the environment; Design reasonable grouting pressure, flow rate and time to avoid excessive pressure causing formation crack expansion; Pressure sensors are installed to monitor the grouting process in real time to ensure that the coagulant can be evenly distributed in the fractured zone.

[0013] According to a coring method for a fractured zone stratum provided by the present invention, the coagulant includes cement slurry, water glass, and a mixture of cement slurry and water glass.

[0014] According to a coring method for a broken zone formation provided by the present invention, the coagulation time of the coagulant is greater than 8 hours.

[0015] The present invention provides a coring method for a broken zone formation. First, a first channel is obtained in the rock formation until the channel reaches the broken zone formation. This process lays the foundation for subsequent operations and ensures that the path to the broken zone is unobstructed. Then, a second channel is obtained in the broken zone formation along the first channel. The diameter of the second channel here is smaller than the first channel. This design is to reduce the physical disturbance to the broken zone formation and avoid further fragmentation or instability of the formation caused by excessive excavation. Subsequently, a coagulant is injected into the broken zone formation. The coagulant can reinforce the broken zone formation and fill the cracks and gaps inside it, thereby enhancing the overall stability and strength of the formation and creating favorable conditions for the next coring work. Finally, a sample core is drilled in the broken zone formation treated with the coagulant again along the first channel. Since the previous preparation work greatly improves the physical properties of the formation, the coring operation performed at this stage is not only smoother, but also can obtain more complete and representative core samples, thereby significantly improving the efficiency and quality of drilling and coring in the broken zone formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The present invention provides a flow chart of a coring method for a fractured zone stratum. DETAILED DESCRIPTION

[0018] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0021] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0023] Reference Figure 1 The present invention provides a coring method for a fractured zone stratum, comprising the following steps: S1, obtaining a first channel in the rock formation until the first channel reaches the fractured zone formation; S2, obtaining a second channel in the fracture zone formation along the first channel, wherein the diameter of the second channel is smaller than the diameter of the first channel; S3, injecting a coagulant into the fracture zone formation; S4. Drill sample cores in the fracture zone along the first channel.

[0024] In the process of coring the broken zone formation, it is first necessary to create a first channel in the rock formation that directly reaches the broken zone formation through drilling technology. This step not only provides the necessary physical access for subsequent operations, but also enables a preliminary understanding of the basic conditions of the formation, laying the foundation for the smooth progress of subsequent work. When the first channel successfully reaches the target area, the next operation is to form a second channel with a smaller diameter inside the broken zone formation. The core of this design is that the smaller diameter second channel can reduce the disturbance to the surrounding unstable rock mass, thereby avoiding further geological damage or structural instability caused by drilling activities.

[0025] Subsequently, in order to ensure that the samples obtained from the fractured zone are representative and structurally intact, a coagulant needs to be injected into the formation. The main function of the coagulant is to enhance the stability of the fractured zone formation and reduce the problems of core breakage or sample contamination that may occur during the coring process. In this way, even in the fractured zone formation with extremely complex geological conditions, the target core can be effectively protected and stabilized to ensure the quality of the final sample obtained.

[0026] Finally, after completing the above preparations, the core sampling work was carried out in the broken zone formation along the first channel established previously. Since various measures have been taken in the early stage to improve the stability of the formation and reduce external interference, and since the diameter of the second channel is smaller than that of the first channel, the broken zone formation can be opened more accurately and safely along the first channel. It should be noted that when implementing the coring method of the broken zone formation, special attention should be paid to the following aspects to ensure the safety, effectiveness and scientificity of the operation: It should be noted that in the process of creating the first channel, appropriate drilling technology and equipment must be used, and the changes in various parameters during the drilling process, such as drilling speed and pressure, must be closely monitored to avoid unnecessary damage to the surrounding rock mass or geological disasters. In addition, the drilling strategy must be adjusted according to actual conditions to ensure that the first channel can smoothly and accurately reach the predetermined fracture zone formation position.

[0027] When entering the fractured zone and starting to form the second channel, drilling tools suitable for small-diameter drilling should be selected, and the drilling speed and force should be strictly controlled to prevent further deterioration of the formation structure due to improper operation. At this stage, the assessment of formation stability should also be strengthened, and temporary reinforcement measures can be taken if necessary to ensure the safety of drilling operations.

[0028] When injecting coagulants, it is necessary to select appropriate coagulant materials, which should not only effectively enhance the physical properties of the formation, but also consider whether their chemical properties will have adverse effects on the formation environment. At the same time, pressure control during grouting is also very critical. Excessive pressure may cause the expansion of formation cracks or even cause local collapse, while insufficient pressure may not achieve the expected reinforcement effect. Therefore, it is necessary to determine the optimal grouting parameters through field tests and flexibly adjust them in actual operations.

[0029] In the core sampling stage, the core sampling plan should be carefully designed based on the data information collected in the previous work, and matching core sampling tools and techniques should be selected to ensure that high-quality core samples are obtained. At the same time, attention should also be paid to recording various abnormal phenomena that occur during the core sampling process. These data are also of great value for subsequent sample analysis and research.

[0030] In some embodiments of the present invention, after step S1 is completed, the first channel is enlarged. It should be noted that enlarging the hole means increasing the diameter of the first channel on the basis of the first channel.

[0031] In the above scheme, the expansion of the hole can increase the diameter of the first channel, providing a larger operating space for subsequent operations. This increased space helps to improve the flexibility and operability of the drilling equipment, especially when performing the drilling of the second channel and the injection of the coagulant, it can be more convenient to install and use the relevant drilling tools and grouting equipment. The larger channel is also conducive to improving ventilation conditions and improving the safety of the working environment.

[0032] Secondly, the wall stability of the first channel can be improved to a certain extent through hole expansion. During the hole expansion process, the cracks and irregular structures on the hole wall can be reduced by properly trimming and smoothing the hole wall, thereby reducing the risk of collapse caused by unstable hole wall. This is of great significance to ensure the safety and success rate of subsequent coring operations.

[0033] Furthermore, hole enlargement can expose more fractured zone strata, thereby making sampling in step S4 more convenient and increasing the diversity of core sample selection.

[0034] In some embodiments of the present invention, step S1 includes the following steps.

[0035] S1.1. Select the target location. Selecting the target location is the starting point of the entire coring process, and requires comprehensive consideration of geological maps, geophysical exploration data, historical drilling records and other information. The target location should be selected to avoid known geological obstacles, such as large faults and caves, and the impact of coring operations on the environment should also be considered to avoid damage to sensitive ecological areas. After the selection is completed, further verification is required through field surveys to ensure the suitability of the selected location.

[0036] S1.2. Obtain the hardness and structure of the rocks around the target location. This stage mainly relies on geological surveys and geophysical detection technologies, such as resistivity logging and seismic wave reflection methods, to obtain the physical properties of the target location and its surrounding rocks. Through these technical means, we can understand the type, hardness, and crack development of the rock in detail. This information is crucial for the subsequent selection of appropriate drilling tools. In addition, the thickness and properties of the surface cover should also be investigated in order to formulate a reasonable drilling plan.

[0037] S1.3. Select drilling tools based on the hardness and structure of the rock at the target location; based on the rock hardness and structure information obtained in the previous step, select the most suitable drill bit and drill rod. Different types of drill bits are required for rocks of different hardness. For example, hard rocks may require diamond drill bits, while softer rocks can choose steel or tungsten carbide drill bits. At the same time, the length, diameter and material of the drill rod also need to be considered to ensure that they can withstand the mechanical load during drilling while reducing wear.

[0038] S1.4. Drill at the target location to obtain the first channel. After all preparations are completed, start the formal drilling. During the drilling process, drilling equipment is required to drill according to the pre-set path and angle. Drilling equipment usually includes a power unit, a drilling tower, drilling tools, etc. The operator needs to adjust the drilling pressure and speed according to the actual situation to ensure the smooth progress of the drilling. As the drilling depth increases, core samples need to be taken out regularly to analyze the changes in the rock formation.

[0039] S1.5. In the process of obtaining the first channel, check the depth and inclination of the first channel to ensure that the first channel can accurately reach the predetermined fracture zone formation; during the entire drilling process, the depth and inclination of the first channel must be constantly monitored to ensure that it moves along the predetermined trajectory. This is usually achieved by using measuring instruments (such as gyroscopes, magnetometers, etc.). Once a deviation from the predetermined path is found, drilling parameters such as drilling pressure and drilling speed should be adjusted in time to correct the drilling direction. In addition, it is necessary to pay close attention to abnormal conditions during the drilling process, such as sudden changes in resistance and sudden changes in the properties of rock cuttings, which are signals that geological obstacles may be encountered.

[0040] S1.6. Record the data during the drilling process, including rock formation changes and drilling speed. During the entire drilling process, various data need to be recorded in detail, which are very important for subsequent geological analysis and coring operations. The recorded data include but are not limited to the type, color, structure, fracture development of the rock formation, as well as parameters such as drilling speed, pressure, and temperature. These data can not only help adjust the drilling strategy in real time, but also provide valuable information for subsequent geological research. For example, the record of rock formation changes helps to identify geological interfaces, while changes in drilling speed can reflect changes in rock formation hardness or the possibility of encountering geological obstacles.

[0041] In some embodiments of the present invention, step S2 comprises: S2.1. A guide component is set up inside the first channel, wherein the guide component has a guide channel coaxially arranged with the first channel.

[0042] Specifically, a special guide component is prepared, which is designed with a guide channel coaxial with the first channel. The guide component is usually made of high-strength, corrosion-resistant materials to ensure that it can work stably for a long time in an underground environment. Before installing the guide component, the first channel needs to be cleaned to ensure that there is no residual rock debris or other debris inside, so as not to affect the installation and use of the guide component.

[0043] When installing the guide component, professional installation tools and equipment should be used to ensure that the center line of the guide component coincides with the center line of the first channel. During the installation process, it is also necessary to regularly check the fixing of the guide component to ensure that it is firm and reliable and will not move during the drilling process.

[0044] S2.2. The drilling device drills downward along the guide channel until it penetrates the fractured zone stratum.

[0045] Specifically, after installing the guide component, the next step is to use a drilling device to drill down along the guide channel. The drilling device usually includes a drill bit, a drill rod, and a power system. Before drilling begins, the drilling device needs to be fully inspected and debugged to ensure that all components are operating normally and the type and size of the drill bit meet the requirements.

[0046] During the drilling process, the drilling device will gradually move downward along the guide channel. The design of the guide channel enables the drilling device to maintain a stable straight path, reduce deviation and vibration, and thus improve the accuracy and stability of drilling. Operators need to closely monitor various parameters during the drilling process, such as drilling speed, drilling pressure, torque, etc., and adjust the drilling parameters in time according to actual conditions to cope with the characteristics of different rock formations.

[0047] During the drilling process, it is necessary to regularly take out core samples and observe the color, structure and cracks of the core to determine whether the broken zone has been reached. Once it is confirmed that the drilling device has penetrated the broken zone, drilling should be stopped immediately and the depth and position of the borehole should be recorded to provide accurate data support for subsequent coagulant injection and coring operations.

[0048] In some embodiments of the present invention, the guide component includes a plurality of guide rings, a connector and a fixing member. The plurality of guide rings are arranged at intervals along the height direction of the first channel, and the inner rings of the plurality of guide rings constitute the guide channel; the inner rings of the guide rings are provided with a plurality of rolling bodies, and the plurality of rolling bodies are arranged at intervals. The connector is provided on the guide rings for connecting the plurality of guide rings; the fixing member is provided on the guide rings at the ends for fixing the guide rings.

[0049] In the above structure, multiple guide rings are arranged at intervals along the height direction of the first channel, and the inner ring of each guide ring together constitutes a guide channel. This design not only provides precise path guidance for the drilling device, but also ensures the stability and reliability of the entire guide system through the distribution of multiple guide rings. The inner ring of the guide ring is provided with multiple rolling bodies, which are arranged at intervals to reduce friction when the drilling device drills downward along the guide channel, and improve the smoothness and efficiency of drilling. The presence of the rolling bodies makes the drilling device smoother during movement, reduces energy loss caused by friction, and thus improves the speed and quality of drilling.

[0050] The design of the fixings needs to ensure that the guide ring is firmly installed in the first channel to prevent displacement or loosening during the drilling process. The fixings are usually made of high-strength materials that can withstand the various forces generated during the drilling process to ensure that the guide ring remains stable under harsh environments such as high pressure and high temperature. The reliable fixation of the fixings not only ensures the overall stability of the guide system, but also provides a more accurate guide path for the drilling device.

[0051] The present invention significantly improves the accuracy and stability of drilling through the combined design of multiple guide rings and rolling elements, and reduces the deviation and vibration during the drilling process. Secondly, the flexible connection method of the connecting parts enhances the overall rigidity and adaptability of the guide system, enabling it to cope with complex geological conditions. Finally, the reliable fixation of the fixing parts ensures the stable installation of the guide ring in the first channel, providing a continuous and stable guide path for the drilling device.

[0052] In some embodiments of the present invention, step S3 includes: S3.1. According to the characteristics of the fractured zone strata, select a coagulant that can effectively consolidate loose particles and will not have a negative impact on the environment; Specifically, detailed geological surveys and laboratory tests are conducted on the characteristics of the strata in the fracture zone, including analysis of parameters such as lithology, fracture development, permeability, and porosity. These data can be used to understand the distribution and characteristics of loose particles in the strata, so as to select the most suitable coagulant. The selection of coagulants should not only consider their consolidation effect, but also ensure that their chemical composition will not pollute groundwater and soil. Coagulants include cement slurry, chemical curing agents (such as polyurethane, epoxy resin, etc.), water glass, and a mixture of cement slurry and water glass. During the selection process, relevant environmental standards and regulations can be referred to to ensure the environmental protection and safety of the selected coagulant.

[0053] S3.2. Design reasonable grouting pressure, flow rate and time to avoid excessive pressure causing formation crack expansion; When designing grouting parameters, it is necessary to comprehensively consider the mechanical properties of the formation and the physical properties of the coagulant. The grouting pressure should be determined based on the compressive strength of the formation and the development of cracks. Too high a pressure may cause the formation cracks to expand or even cause new cracks, while too low a pressure may not allow the coagulant to fully penetrate the formation. Generally, the grouting pressure should be around 70% of the formation compressive strength to ensure effective penetration of the coagulant without causing formation damage.

[0054] The setting of grouting flow rate should take into account the permeability of the formation and the setting time of the coagulant. Too large a flow rate will lead to uneven distribution of the coagulant in the formation, while too small a flow rate will affect the construction efficiency. In general, the grouting flow rate should be controlled between a few liters and tens of liters per minute, and the specific value needs to be determined based on field tests.

[0055] The determination of grouting time needs to be combined with grouting pressure and flow rate to ensure that the coagulant can fully fill the cracks and pores in the formation. Too short grouting time may lead to uneven distribution of coagulant, while too long time will waste materials and time. Generally, the grouting time should be determined according to the permeability characteristics of the formation and the setting time of the coagulant, generally more than 8 hours.

[0056] S3.3. Install pressure sensors to monitor the grouting process in real time to ensure that the coagulant can be evenly distributed in the fractured zone.

[0057] In order to ensure the smooth progress of the grouting process, pressure sensors need to be installed in the grouting pipeline and the formation. These sensors can monitor the changes in grouting pressure in real time and help operators adjust grouting parameters in time. The installation location of the pressure sensor should be selected at the key nodes of the grouting pipeline and the key parts of the formation, such as near the grouting port and the area with dense formation cracks.

[0058] During the grouting process, operators should closely monitor the data sent back by the pressure sensor to ensure that the grouting pressure is always within the set range. If the pressure is found to be abnormally high, the grouting pressure should be reduced or grouting should be suspended in time to avoid the expansion of formation cracks. At the same time, the grouting flow rate and time can be adjusted to ensure that the coagulant can be evenly distributed in the broken zone formation. Real-time monitoring not only helps to improve the accuracy and efficiency of grouting, but also can promptly discover and solve potential problems to ensure the safety and effectiveness of the grouting process.

[0059] In some possible embodiments, the first channel is drilled with a drill bit of 127 mm in diameter, and generally a broken zone layer is encountered when drilling to about 90 m. When expanding the hole, a 152 mm drill bit is used for expanding the hole. The second channel is drilled with an 89 mm drill bit until the broken zone is penetrated. In step S3, 0.5 t of cement is injected into the 89 mm second channel, the air pressure is 0.3 Mpa, and it solidifies for 24 hours. In step S4, a 127 mm coring drill bit is used for drilling.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coring method for a fractured zone formation, characterized in that: include: Acquire a first channel in the rock formation until the first channel reaches the fractured zone formation; Acquire a second channel in the fracture zone formation along the first channel, wherein the diameter of the second channel is smaller than the diameter of the first channel; injecting a coagulant into the fracture zone formation; A sample core is drilled in the fracture zone formation along the first channel.

2. The coring method of the fractured zone stratum according to claim 1, characterized in that: After the step of obtaining the first channel in the rock formation until the first channel reaches the fractured zone formation is completed, the first channel is expanded.

3. The coring method of the fractured zone stratum according to claim 2, characterized in that: The step of obtaining a first channel in a rock formation until the first channel reaches a fractured zone formation comprises: Select the target location; Obtaining the hardness and structure of rocks around the target location; Selecting a drilling tool according to the hardness and structure of the rock at the target location; A hole is drilled at the target location to obtain the first channel.

4. The coring method of the fractured zone stratum according to claim 3, characterized in that: The step of obtaining a first channel in the rock formation until the first channel reaches the fractured zone formation further comprises: In the process of acquiring the first channel, checking the depth and inclination of the first channel to ensure that the first channel can accurately reach the predetermined fracture zone formation; The data during the drilling process are recorded, including rock formation changes and drilling speed.

5. The coring method of the fractured zone stratum according to claim 2, characterized in that: Acquiring a second channel in the fracture zone formation along the first channel comprises: A guide component is installed inside the first channel, wherein the guide component has a guide channel coaxially arranged with the first channel; The drilling device drills downward along the guide channel until penetrating the fracture zone stratum.

6. The coring method of the fractured zone stratum according to claim 5, characterized in that: The guide component comprises: A plurality of guide rings are arranged at intervals along the height direction of the first channel, and the inner rings of the plurality of guide rings constitute the guide channel; A connecting piece, provided on the guide ring, used to connect a plurality of guide rings; A fixing member is arranged on the guide ring at the end portion and is used for fixing the guide ring.

7. The coring method of the fractured zone stratum according to claim 6, characterized in that: The inner ring of the guide ring is provided with a plurality of rolling bodies, and the plurality of rolling bodies are arranged at intervals.

8. The coring method of the fractured zone stratum according to claim 1, characterized in that: The injecting of a coagulant into the fracture zone formation comprises: According to the characteristics of the fractured zone strata, a coagulant is selected that can effectively consolidate loose particles and will not have a negative impact on the environment; Design reasonable grouting pressure, flow rate and time to avoid excessive pressure causing formation crack expansion; Pressure sensors are installed to monitor the grouting process in real time to ensure that the coagulant can be evenly distributed in the broken zone formation.

9. The coring method of the fractured zone stratum according to claim 8, characterized in that: The coagulant includes cement slurry, water glass and a mixture of cement slurry and water glass.

10. The coring method of the fractured zone stratum according to claim 9, characterized in that: The coagulation time of the coagulant is greater than 8 hours.

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