A method for hydraulically fracturing a downhole oriented long hole cased hole

Abstract

This invention relates to the field of coal mining technology and provides a method for running casing in directional long-hole hydraulic fracturing in underground mines. The method includes: cleaning the borehole wall to ensure a clean borehole surface; determining the borehole inlet and preparing for subsequent casing filling; filling the interior of the borehole with a hot-melt conduit until the conduit reaches the bottom of the borehole; and solidifying the hot-melt conduit to form a casing layer supporting the borehole wall within the borehole. This invention achieves the purpose of generating casing within the underground borehole by filling the borehole with a hot-melt conduit, effectively supporting the borehole wall, ensuring the continuity and stability of the borehole, improving the success rate and efficiency of running casing in hydraulic fracturing boreholes, reducing the risks and costs of hydraulic fracturing operations, ensuring the smooth progress of fracturing operations, and, by forming a stable fracturing channel, accurately injecting fracturing fluid into the target formation, thus improving the directionality and efficiency of hydraulic fracturing technology.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method for running casing in directional long-hole hydraulic fracturing in underground mines. Background Technology

[0002] The application of hydraulic fracturing technology in the coal mining field mainly includes the following aspects: First, coalbed methane extraction. Coalbed methane, or coalbed gas, is natural gas embedded in coal seams, and its extraction is one of the important ways to ensure coal mine safety and comprehensive resource utilization. Hydraulic fracturing technology can form a fracture network in the coal seam, improve the permeability of coalbed methane, and promote its release and extraction. Second, coal mine roof control. In coal mining, roof stability is an important aspect of ensuring mine safety. In particular, the stability of thick and hard roof coal seams has a significant impact on mine safety. Hydraulic fracturing technology can be used to weaken the roof, reduce its stability, make it easier to collapse, and reduce the pressure on the mine. Third, mine pressure control. In the process of coal mining, mine pressure is a common challenge. Especially in the mining of thick, hard-roofed coal seams, hydraulic fracturing technology can slow down the release rate of mine pressure by weakening the coal and rock mass, reduce lateral support pressure on the surrounding rock by fracturing the overhanging roof, improve the stress environment of the goaf, and enhance the stability of the goaf, providing an important guarantee for safe production in the mine. Fourth, it is used for gas drainage. Coal mine gas is a dangerous combustible gas, and its drainage is crucial for mine safety. Hydraulic fracturing technology can improve the permeability of coal seams, increase the release rate of gas, and improve drainage efficiency. Fifth, it is used for the prevention and control of geological disasters in mines. Hydraulic fracturing technology can also be used to prevent and control geological disasters in mines, such as coal and gas outbursts and coal and gas explosions, by changing the mechanical properties and permeability of the coal and rock mass, thereby mitigating the harm caused by geological disasters. In summary, the application of hydraulic fracturing technology in the coal mining field provides new technical means and ideas for improving coal mine safety, resource development and utilization, and environmental protection.

[0003] As the scale of rock formation modification in coal mines increases, the fracturing capacity and pressure also rise, along with the requirements for drilling depth and directional drilling. Furthermore, when the target rock formation is dense and hard, traditional hydraulic fracturing technology may not achieve the desired fracturing effect. To overcome this challenge, special techniques such as casing are needed to achieve directional fracturing and facilitate fracturing initiation. Traditional hydraulic fracturing borehole casing installation has the following problems: First, when drilling through multiple formations, the unstable interfaces between formations can easily lead to borehole collapse or failure. Second, when drilling long boreholes, changes in the formation or the characteristics of the borehole itself can easily cause borehole collapse during long-hole drilling.

[0004] Therefore, how to provide a method for running casing in directional long-hole drilling in wells is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a method for running casing in downhole directional long-hole hydraulic fracturing, which solves the problem of easy borehole collapse in existing hydraulic fracturing technology.

[0006] This invention provides a method for running casing in downhole directional long-hole hydraulic fracturing, comprising:

[0007] Clean the borehole walls to ensure the borehole surface is clean;

[0008] Determine the borehole entry point and prepare for subsequent casing filling work;

[0009] Use a hot melt conduit to fill the inside of the borehole until the hot melt conduit is filled to the bottom of the borehole;

[0010] The hot-melt conduit solidifies and forms a sleeve inside the borehole that supports the borehole wall.

[0011] According to the method for running casing in directional long-hole hydraulic fracturing according to the present invention, the method of filling the interior of the borehole with a thermoplastic conduit includes:

[0012] Use heating equipment to heat the hot melt conduit above its softening point, making it flowable;

[0013] A pneumatic pushing device is used to pressurize and fill the heated hot melt conduit from the inlet into the borehole until the hot melt conduit fills the bottom of the borehole.

[0014] According to the method for running casing in directional long-hole hydraulic fracturing according to the present invention, the step of cleaning the borehole wall to ensure a clean borehole surface includes:

[0015] Determine the borehole parameters based on the geological conditions of the coal seam and the requirements for hydraulic fracturing;

[0016] Determine the drilling path and drilling area based on the formation conditions, downhole equipment, and operating conditions.

[0017] The method for running casing in directional long-hole hydraulic fracturing according to the present invention further includes:

[0018] Directional drilling equipment is used to drill directional holes based on a defined drilling path to ensure accurate penetration of the target coal seam and reach the predetermined hydraulic fracturing location.

[0019] According to the method for running casing in directional long-hole hydraulic fracturing according to the present invention, the directional drilling process includes, after which:

[0020] Based on comprehensive mine information, boreholes are monitored and evaluated in real time to ensure that borehole quality, borehole wall stability, and inclination deviation meet design requirements.

[0021] The method for running casing in directional long-hole hydraulic fracturing according to the present invention further includes:

[0022] Based on the assessment results, coal seam geological conditions, fracturing objectives, and fracturing effect requirements, a fracturing design scheme is formulated to ensure that the fracturing fluid formulation, injection pressure, and injection rate achieve the expected fracturing effect.

[0023] According to the method for running casing for directional long-hole hydraulic fracturing provided by the present invention, the hot-melt conduit is solidified to form a casing layer supporting the borehole wall inside the borehole, and then includes: performing hydraulic fracturing, and after the hydraulic fracturing is completed, sealing and preventing seepage at the wellhead.

[0024] The method for running casing in directional long-hole hydraulic fracturing according to the present invention further includes, in part, performing hydraulic fracturing:

[0025] Monitoring equipment is used to monitor and record fracturing parameters in real time during the fracturing process;

[0026] Analyze the monitored data to assess the current fracturing effect;

[0027] Adjust fracturing parameters promptly based on analysis results to achieve the desired fracturing effect.

[0028] The method for running casing in directional long-hole hydraulic fracturing according to the present invention further includes: during the drilling process, when the rock strata are dense rock strata, using cutting technology to cut predetermined cracks in the rock.

[0029] The method for running casing for directional long-hole hydraulic fracturing according to the present invention further includes: using directional perforation technology to drill directional holes in the wellbore so that hydraulic fracturing fluid can be precisely injected into the target area.

[0030] This invention provides a method for running casing in downhole directional long-hole hydraulic fracturing. By filling the borehole with a thermoplastic conduit, a casing layer is formed to support the borehole wall, thus achieving the purpose of generating casing within the downhole borehole. This method effectively supports the borehole wall, preventing collapse and ensuring borehole continuity and stability, improving the success rate and efficiency of running casing in hydraulic fracturing boreholes. It provides support and stability to the borehole wall, preventing borehole collapse, reducing abandoned boreholes, and lowering the risks and costs of hydraulic fracturing operations. Furthermore, the addition of casing provides extra support to the borehole wall, forming a stable borehole wall structure that effectively resists formation stresses. Pressure and deformation reduce the risk of borehole collapse, improving the stability and safety of downhole drilling. On the other hand, it creates a downhole fracturing channel; the addition of casing effectively forms this channel, providing a good pathway for hydraulic fracturing operations. This allows fracturing fluid to be effectively injected into the target formation, maximizing the fracturing effect. Furthermore, it effectively seals the space around the borehole, preventing fracturing fluid leakage and reducing pressure loss due to borehole leakage, ensuring smooth fracturing operations. By forming a stable fracturing channel, fracturing fluid can be accurately injected into the target formation, maximizing the fracturing effect and improving the directionality and efficiency of hydraulic fracturing technology. This method of installing casing inside the downhole borehole can be applied to different types of hydraulic fracturing operations, with a wide range of applications, effectively solving common and challenging problems in downhole hydraulic fracturing operations. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this 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 this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic flowchart of a method for running casing in directional long-hole hydraulic fracturing according to an embodiment of the present invention. Detailed Implementation

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

[0034] The following is combined with Figure 1This invention describes a method for running casing in downhole directional long-hole hydraulic fracturing.

[0035] Figure 1 This is a schematic flowchart of a method for running casing in directional long-hole hydraulic fracturing according to an embodiment of the present invention, as shown below. Figure 1 As shown, the method includes:

[0036] Step 101: Clean the borehole wall to ensure the borehole surface is clean; that is, by thoroughly cleaning the debris and other obstacles inside the borehole, ensure that the borehole wall is clean and smooth so that the hot melt conduit can adhere better and can smoothly reach the bottom of the borehole from the inlet.

[0037] Step 102: Determine the borehole entry point and prepare for subsequent casing filling. Casing filling may include determining the material and process of the hot-melt casing. The process includes casing lowering and pressurized filling to ensure the casing can be stably filled into the borehole. The hot-melt conduit material can be thermoplastics such as polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC). These materials have good processing properties, good resistance to various chemicals, and are not easily corroded by acids, alkalis, or salt solutions. Compared to some traditional solvent-based materials, hot-melt conduits do not contain volatile organic compounds (VOCs), reducing environmental pollution and meeting modern environmental protection requirements. Choose a suitable heating method to ensure that the heat-fused casing can be fully softened and filled into the borehole. Common heating methods include electric heating and infrared heating. The heating temperature should be adjusted according to the melting point of the casing material to ensure that it softens at an appropriate temperature without overheating and decomposing. During the filling process, use pressurizing equipment (such as high-pressure pumps, pneumatic systems, etc.) to apply a certain pressure to the casing to ensure that it can fit tightly against the borehole wall and form a good sealing effect.

[0038] Step 103: Use a hot melt conduit to fill the inside of the borehole until the hot melt conduit fills to the bottom of the borehole.

[0039] Step 104: The hot melt conduit solidifies and forms a sleeve inside the borehole that supports the borehole wall.

[0040] In this embodiment, after step 104, the following steps are included: performing hydraulic fracturing, and after the hydraulic fracturing is completed, sealing and preventing seepage at the wellhead to prevent fracturing fluid or other fluids from leaking from the wellhead and to prevent groundwater or other fluids from seeping into the wellbore, thereby protecting the integrity of the wellbore.

[0041] Furthermore, hydraulic fracturing also includes: using monitoring equipment to monitor and record fracturing parameters in real time during the fracturing process; analyzing the monitored data and evaluating the current fracturing effect;

[0042] Adjust fracturing parameters promptly based on analysis results to achieve the desired fracturing effect.

[0043] This setup, through real-time monitoring and parameter adjustment, ensures that fracturing fluid can be evenly distributed throughout the coal seam, forming an ideal fracture network and improving fracture propagation efficiency. Real-time monitoring and dynamic adjustment also allow for the timely detection and handling of potential safety hazards, reducing the occurrence of construction accidents and ensuring the safety of construction personnel.

[0044] As can be seen from the above solution, the present invention achieves the purpose of generating casing inside the downhole borehole by filling the borehole with a hot-melt guide tube to form a casing layer to support the borehole wall.

[0045] This scheme effectively supports the borehole wall, preventing collapse and ensuring borehole continuity and stability. It improves the success rate and efficiency of casing installation in hydraulic fracturing boreholes, providing support and stability to the borehole wall, thus preventing borehole collapse, reducing abandoned boreholes, and lowering the risks and costs of hydraulic fracturing operations. Furthermore, the casing provides additional support to the borehole wall, forming a stable borehole wall structure that effectively resists formation pressure and deformation, reducing the risk of borehole collapse and improving the stability and safety of downhole drilling. The addition of casing effectively creates a downhole fracturing channel, providing a good pathway for hydraulic fracturing operations. This allows fracturing fluid to be effectively injected into the target formation, maximizing fracturing effectiveness. Furthermore, it effectively seals the space around the borehole, preventing fracturing fluid leakage and reducing pressure loss due to borehole-related seepage, ensuring smooth fracturing operations. By forming a stable fracturing channel, fracturing fluid can be accurately injected into the target formation, maximizing fracturing effectiveness and improving the directionality and efficiency of hydraulic fracturing technology. This method of installing casing inside the downhole borehole can be applied to different types of hydraulic fracturing operations, has a wide range of applications, and can effectively solve common and challenging problems in downhole hydraulic fracturing operations.

[0046] In this embodiment, step 103, filling the borehole with a hot melt conduit, includes: heating the hot melt conduit above its softening point using a heating device to make it flowable; and using a pneumatic pushing device to pressurize and fill the heated hot melt conduit from the inlet into the borehole until the hot melt conduit fills the bottom of the borehole.

[0047] The heating equipment can be electric heating equipment, which generates heat through resistance wire or heating element to directly heat the hot melt conduit, so that the hot melt conduit reaches the appropriate temperature. Then, it is slowly and steadily fed into the borehole by a pneumatic pushing device until it fills the predetermined position (usually the bottom of the borehole). Throughout the filling process, an appropriate filling pressure is maintained to ensure that the hot melt conduit can fill the entire space evenly and make close contact with the borehole wall. Once the hot melt conduit is filled in place, the material of the hot melt conduit is rapidly hardened and forms a stable structure by forced cooling such as air cooling or water cooling. The cooled hot melt conduit usually has high hardness and compressive strength, which can effectively support the pressure of the environment around the borehole and maintain the shape of the borehole.

[0048] In a further embodiment, step 100 is included before step 101: determining the drilling parameters based on the coal seam geological conditions and hydraulic fracturing requirements; and determining the drilling path and drilling area based on the formation conditions, downhole equipment, and operating conditions.

[0049] The parameters of the borehole include its diameter, length, and inclination angle. A reasonable diameter can accommodate more fracturing fluid and proppant, a longer borehole can cover a larger area, and a reasonable inclination angle can make the borehole fit the coal seam better, reduce displacement, and improve the fracturing effect.

[0050] This setup ensures that the borehole can effectively reach the target coal seam and provide the best physical channel for hydraulic fracturing. By rationally selecting borehole parameters, the starting pressure can be reduced, the fracture propagation efficiency can be increased, and thus the resource recovery rate can be improved. Choosing a suitable borehole path and area can avoid crossing unstable strata or obstacles, reducing safety hazards during construction. Based on the capabilities of existing downhole equipment (such as drilling rig power, delivery system, etc.), a suitable borehole path can be selected to ensure that the equipment can work normally. Reasonable path planning can shorten construction time, reduce equipment load, and improve overall construction efficiency.

[0051] Furthermore, between steps 100 and 101, the method further includes: using directional drilling equipment to perform directional drilling based on a determined drilling path to ensure accurate penetration of the target coal seam and reaching the predetermined hydraulic fracturing location.

[0052] This setup ensures that the borehole can accurately penetrate the target coal seam, thereby improving the success rate of hydraulic fracturing. Through precise path planning and real-time adjustments, the borehole can smoothly reach the predetermined fracturing position, ensuring that the fracturing fluid can be effectively injected into the target area to form ideal fractures and improve fracture propagation efficiency.

[0053] In some embodiments, during drilling, when the rock formation is dense, a cutting technique is used to cut predetermined fractures in the rock. This configuration allows for the creation of sufficient fractures or channels in dense rock formations, as conventional drilling and fracturing methods may struggle to form such a large number of fractures or channels. The cutting technique pre-creates these fractures or channels within the rock, providing an "entry point" for subsequent hydraulic fracturing. The cut fractures serve as channels for fracturing fluid to enter the rock formation, reducing the initial pressure required for hydraulic fracturing, lowering energy consumption and equipment load, and improving fracturing efficiency.

[0054] Furthermore, this also includes employing directional perforation technology to drill directional holes in the wellbore, allowing hydraulic fracturing fluid to be precisely injected into the target area. Specifically, a directional perforation gun can be used to accurately drill small holes in the wellbore wall according to a pre-designed path and angle. Perforation guns are typically equipped with sensors such as GPS positioning systems, gyroscopes, and magnetic locators to monitor the position and angle of the perforation in real time, ensuring accuracy. The perforation gun can be lowered into the wellbore via cable or tubing, and after reaching the predetermined depth, perforation is performed according to the design requirements. To achieve directional perforation, guiding tools (such as elbows, stabilizers, etc.) are usually installed on the perforation gun to control its attitude and direction. These tools can be adjusted in real time via a ground control system to ensure that the perforation gun moves along the predetermined path.

[0055] With this setup, directional perforation technology can drill directional holes in the wellbore, allowing fracturing fluid to be precisely injected into the target area, avoiding unnecessary diffusion, improving the efficiency of fracture formation, and by controlling the direction and position of the perforations, the fractures can be evenly distributed in the network, which can optimize the fracture network, improve the fracturing success rate, reduce costs, and protect the environment.

[0056] In this embodiment, directional drilling is performed, followed by: integrating mine information to monitor and evaluate the borehole in real time to ensure that the borehole quality, borehole wall stability, and dip angle deviation meet the design requirements. The integrated mine information may include roadway structure, spatial layout, overburden characteristics, geological structure, and support, etc.

[0057] In other words, during the drilling process, mid-course measurements (such as well logging and imaging) are conducted regularly. These data can be obtained through methods such as ground-penetrating radar and core drilling to verify whether the borehole is progressing along the predetermined path. If deviations are found, drilling parameters are adjusted in a timely manner. Based on the mid-course measurement results, the subsequent borehole path is optimized to ensure that the borehole can successfully reach the predetermined hydraulic fracturing position. If necessary, the angle of the drill bit can be adjusted or part of the path can be replanned.

[0058] Optionally, during drilling, a logging-while-drilling system can be used to monitor parameters such as the position, depth, inclination, and pressure of the drill bit in real time. This data can help operators adjust the direction and angle of the drill bit in a timely manner to ensure that the borehole advances along the predetermined path. Acoustic sensors can be used to monitor the integrity of the borehole wall and detect whether there are cracks or loosening. Acoustic sensors can provide high-resolution images of the borehole wall to help assess its stability.

[0059] Data collected by monitoring equipment is transmitted to the ground control center in real time via wireless or wired networks. Data transmission should be highly reliable to ensure that there is no data loss or delay. The collected data is analyzed and processed at the ground control center. Through data visualization technology, various parameters of the borehole can be displayed intuitively to help operators make quick decisions.

[0060] Based on monitoring data, drilling parameters are adjusted in real time to ensure that the borehole quality meets design requirements.

[0061] Optionally, the integrity and stability of the borehole wall can be assessed by means of acoustic imaging, video monitoring, etc., and the inclination and azimuth angles of the borehole can be accurately measured by using equipment such as gyroscopes and magnetic positioning to ensure that it meets the design requirements.

[0062] Preferably, after drilling is completed, a comprehensive final borehole measurement is performed to confirm whether the borehole has accurately penetrated the target coal seam and reached the predetermined fracturing position. The final borehole measurement should include parameters such as the borehole diameter, length, dip angle, and offset.

[0063] In some embodiments, the method further includes: developing a fracturing design scheme based on the assessment results, coal seam geological conditions, fracturing objectives, and fracturing effect requirements, so as to ensure that the fracturing fluid formulation, injection pressure, and injection rate achieve the expected fracturing effect.

[0064] Specifically, based on the borehole completion measurement and borehole wall stability assessment results, confirm whether the borehole meets the design requirements and whether there are potential risk points (such as cracks, loosening, etc.). If problems are found, take remedial measures in a timely manner, such as casing, to ensure the integrity and stability of the borehole. Analyze the physical and mechanical properties of the formation by combining coal seam geological conditions such as coal seam thickness, strike, dip angle, fracture development, and formation lithology to determine their impact on the fracturing effect. Select a suitable fracturing fluid based on the coal seam geological conditions and fracturing objectives. Determine an appropriate injection pressure based on the coal seam's compressive strength and fracture development to break through the natural fractures of the coal seam while avoiding unnecessary equipment load or formation damage. The maximum injection pressure should be lower than the coal seam's fracturing pressure to avoid excessive fracturing leading to formation instability or fracture extension to non-target areas. Set an appropriate injection rate based on the coal seam's permeability and fracturing objectives to ensure that the fracturing fluid enters the coal seam quickly while avoiding excessive injection that could lead to fracture closure or fluid loss.

[0065] With this setup, an ideal fracture network can be formed through a reasonable fracturing fluid formulation and injection parameters, ensuring that the fracturing fluid can be evenly distributed throughout the coal seam, improving fracture propagation efficiency. By setting reasonable injection pressure and speed, excessive equipment load can be avoided, extending equipment service life and reducing maintenance costs.

[0066] This invention establishes a directional drilling and casing technology for hydraulic fracturing in coal mines by combining directional drilling, hydraulic fracturing technology, and the insertion of casing within the borehole. This method can improve the efficiency and success rate of hydraulic fracturing operations, thereby further enhancing the effectiveness of hydraulic fracturing. The specific effects are as follows:

[0067] 1. Adding casing during drilling can effectively support the borehole wall, prevent borehole wall collapse, ensure the continuity and stability of drilling, and thus improve the borehole success rate.

[0068] 2. The addition of casing can provide additional support to the borehole wall, forming a stable borehole wall assembly structure, effectively resisting formation pressure and deformation, reducing the risk of borehole collapse, and improving the stability and safety of downhole drilling.

[0069] 3. By forming a casing in the borehole, a downhole fracturing channel can be effectively created. This fracturing channel provides a good passage for hydraulic fracturing operations, allowing fracturing fluid to be effectively injected into the target formation, thereby maximizing the fracturing effect.

[0070] 4. The addition of casing can effectively seal the space around the borehole, prevent the leakage of fracturing fluid, effectively reduce leakage and pressure loss caused by the borehole itself, and ensure the smooth progress of fracturing operations.

[0071] 5. By forming a stable fracturing channel, fracturing fluid can be accurately injected into the target formation, maximizing the fracturing effect and thus improving the directionality and efficiency of hydraulic fracturing technology.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for running casing in directional long-hole hydraulic fracturing in wells, characterized in that, include: Clean the borehole walls to ensure the borehole surface is clean; Determine the borehole entry point and prepare for subsequent casing filling work; Use a hot melt conduit to fill the inside of the borehole until the hot melt conduit is filled to the bottom of the borehole; The method of filling the interior of the borehole using a hot-melt conduit includes: Use heating equipment to heat the hot melt conduit above its softening point, making it flowable; A pneumatic pushing device is used to pressurize and fill the heated hot melt conduit from the inlet into the borehole until the hot melt conduit fills the bottom of the borehole. The hot melt conduit solidifies and forms a sleeve inside the borehole that supports the borehole wall; The process of cleaning the borehole wall to ensure a clean borehole surface includes, prior to: Determine the borehole parameters based on the geological conditions of the coal seam and the requirements for hydraulic fracturing; Determine the drilling path and drilling area based on the formation conditions, downhole equipment, and operating conditions; Using directional drilling equipment, directional drilling is carried out based on a determined drilling path to ensure accurate penetration of the target coal seam and reaching the predetermined hydraulic fracturing location; The process of directional drilling then includes: Based on comprehensive mine information, boreholes are monitored and evaluated in real time to ensure that borehole quality, borehole wall stability, and inclination deviation meet design requirements; Also includes: Based on the assessment results, coal seam geological conditions, fracturing objectives, and fracturing effect requirements, a fracturing design scheme is formulated to ensure that the fracturing fluid formulation, injection pressure, and injection rate achieve the expected fracturing effect.

2. The method for running casing in directional long-hole hydraulic fracturing according to claim 1, characterized in that, The hot-melt conduit is solidified and formed into a casing that supports the borehole wall inside the borehole. The process then includes: hydraulic fracturing, and after the hydraulic fracturing is completed, sealing and seepage prevention treatment of the wellhead.

3. The method for running casing in downhole directional long-hole hydraulic fracturing according to claim 2, characterized in that, The hydraulic fracturing process also includes: Monitoring equipment is used to monitor and record fracturing parameters in real time during the fracturing process; Analyze the monitored data to assess the current fracturing effect; Adjust fracturing parameters promptly based on analysis results to achieve the desired fracturing effect.

4. The method for running casing in downhole directional long-hole hydraulic fracturing according to claim 1, characterized in that, Also includes: During the drilling process, when the rock strata are dense, cutting techniques are used to cut predetermined cracks in the rock.

5. The method for running casing in downhole directional long-hole hydraulic fracturing according to claim 4, characterized in that, Also includes: Directional perforation technology is used to drill directional holes in the wellbore so that hydraulic fracturing fluid can be precisely injected into the target area.

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