Long-distance directional through-layer concentrated liquid supply and hydraulic fracturing method and system

Abstract

The application provides a long-distance directional through-layer concentrated liquid supply and cooperative hydraulic fracturing method and system, relates to the underground safety technical field of coal mines, and comprises the following steps: forming a through-layer drilling hole, so that the through-layer drilling hole passes through a coal rock mass between a first roadway and a second roadway, and serves as a cross-road high-pressure fluid conveying channel; arranging a high-pressure pump station in the first roadway and in communication with the through-layer drilling hole; arranging a high-pressure water distribution device at an orifice end of the through-layer drilling hole in the second roadway; respectively connecting a plurality of outlet branches of the high-pressure water distribution device with a plurality of fracturing drilling holes on the side of the second roadway; and conveying the high-pressure fluid to the high-pressure water distribution device through the through-layer drilling hole, and distributing the high-pressure fluid to each fracturing drilling hole by switching on and off each outlet branch. The application uses the through-layer drilling hole as a hidden channel in the coal rock mass, realizes concentrated liquid supply and cooperative fracturing of a single fixed pump station to multiple drilling fields, reduces high-pressure pipelines in the roadway, eliminates the hidden danger of pipe explosion, and shortens the fracturing engineering cycle.

Description

Technical Field

[0001] This invention relates to the field of underground safety technology in coal mines, and in particular to a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method and system. Background Technology

[0002] Hydraulic fracturing in coal mines is an important technical means to increase the permeability of coal seams and improve gas extraction efficiency. As the length of the working face continues to increase, the number of fracturing drilling sites increases accordingly, placing higher demands on the continuous operation capability and multi-drilling site coordination capability of the fracturing fluid supply system.

[0003] In existing technologies, downhole hydraulic fracturing mostly adopts a decentralized operation mode of one drilling site and one pump station. That is, each drilling site is equipped with a separate high-pressure pump station. After fracturing at one drilling site is completed, the pump station is disassembled, transported, and reinstalled at the next drilling site. Some mines have also tried to fix the pump station in a certain location and lay high-pressure pipelines along the roadway for long distances to supply fluid to different drilling sites. A small number of solutions use downhole mobile fracturing pump stations, integrating the pump station on a mobile platform for transfer between different drilling sites.

[0004] However, all of the above solutions have significant shortcomings: in the one-drill-site-one-pump-station model, the pump station needs to be relocated repeatedly with the drilling site, and the relocation workload accounts for a large proportion of the total fracturing project time, severely extending the project cycle; in the long-distance roadway pipe-laying and fluid supply model, the high-pressure pipeline is laid openly along the roadway floor for hundreds of meters, and is in a high-pressure pulse state for a long time. Once a pipe bursts, the instantaneous jet of high-pressure fluid can easily cause injury accidents; the mobile pump station is essentially still a pump station that moves with the drilling site, failing to realize the sharing of a single fluid supply backbone system among multiple drilling sites. In addition, when there is a thick coal and rock mass blocking the roadway between the target drilling site and the roadway where the pump station is located, the pipeline can only detour along the roadway, resulting in a long path and a large pressure drop, making it impossible to achieve direct fluid supply across roadways.

[0005] Therefore, the existing solution has technical problems such as low operating efficiency due to frequent relocation of pump stations, significant safety hazards of high-pressure open-laid pipelines in roadways, inability of multiple drilling sites to coordinate operations, and limited fluid supply paths across roadways. Summary of the Invention

[0006] This invention provides a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method and system to solve the technical problems of low efficiency, large safety hazards in roadway pipelines, inability to coordinate operations among multiple drilling sites, and limited fluid supply paths across roadways in existing downhole hydraulic fracturing operations.

[0007] This invention provides a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method, comprising: forming a cross-layer borehole, which passes through the coal and rock mass between a first roadway and a second roadway, serving as a cross-roadway high-pressure fluid transport channel; arranging a high-pressure pump station in the first roadway and connecting the high-pressure pump station to the borehole end of the cross-layer borehole located in the first roadway; arranging a high-pressure water distribution device at the borehole end of the cross-layer borehole located in the second roadway, the high-pressure water distribution device being used to distribute a single high-pressure fluid into multiple high-pressure fluids; connecting multiple outlet branches of the high-pressure water distribution device to fracturing boreholes in multiple drilling sites on the side of the second roadway; and by switching the on / off state of each outlet branch of the high-pressure water distribution device, transporting the high-pressure fluid provided by the high-pressure pump station through the cross-layer borehole to the high-pressure water distribution device, and distributing it to each fracturing borehole through the high-pressure water distribution device.

[0008] According to the present invention, a long-distance directional cross-layer centralized fluid supply and hydraulic fracturing method is provided, wherein the cross-layer borehole adopts long-distance directional drilling; forming the cross-layer borehole includes: determining the borehole trajectory according to the spatial coordinate relationship between the first roadway and the second roadway; using a directional drilling rig in conjunction with a measurement-while-drilling system to perform directional drilling, wherein the directional drilling rig is used to adjust the drilling direction according to the borehole inclination and azimuth angles collected in real time by the measurement-while-drilling system; and inserting a casing into the borehole in the opening section of the first roadway and grouting to solidify the casing, thereby forming the cross-layer borehole as a high-pressure fluid transport channel across the roadways.

[0009] According to the present invention, a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method is provided, wherein a high-pressure pump station is fixedly arranged near the borehole of the cross-layer borehole in the first roadway, and the high-pressure pump station is kept in a fixed position during the fracturing operation.

[0010] According to the present invention, a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method is provided, wherein the high-pressure water distribution device includes an inlet and multiple outlet branches, each outlet branch is equipped with an independently controlled valve, and the inlet is connected to the orifice end of the cross-layer borehole located in the second roadway.

[0011] According to the present invention, a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method is provided. By switching the on / off state of each outlet branch of a high-pressure water distribution device, high-pressure fluid provided by a high-pressure pump station is transported to the high-pressure water distribution device via cross-layer boreholes. The high-pressure water distribution device then distributes the fluid to each fracturing borehole. The method includes: supplying fluid to each fracturing borehole in a sequential, flow-line operation according to the drilling site and borehole by switching the on / off state of each outlet branch; wherein, while high-pressure fluid is introduced into the fracturing borehole of the current drilling site for fracturing operations, the next drilling site prepares for borehole sealing and pipeline connection; after the fracturing operation of the current drilling site is completed, the corresponding outlet branch of the high-pressure water distribution device is switched to transport the high-pressure fluid to the fracturing borehole of the next drilling site, until all drilling sites have completed fracturing operations.

[0012] According to the present invention, a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method is provided. The high-pressure water distribution device adopts a flow collector and distributor. A high-pressure manifold is formed inside the flow collector and distributor. The inlet and multiple outlet branches are respectively connected to the high-pressure manifold and distributor. Each outlet branch is equipped with an independent high-pressure shut-off valve.

[0013] According to the present invention, a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method is provided, which connects multiple outlet branches of a high-pressure water distribution device to each fracturing borehole in multiple drilling sites on the side of the second roadway, including: connecting multiple outlet branches of the high-pressure water distribution device to each fracturing borehole in multiple drilling sites on the side of the second roadway through high-pressure branch pipes, forming a fluid supply path from the high-pressure pump station through the cross-layer borehole and the high-pressure water distribution device to each fracturing borehole.

[0014] According to the present invention, a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method is provided, wherein the valves of each outlet branch are electro-hydraulic high-pressure valves, and the on / off switching of each valve is centrally controlled by a remote control console.

[0015] The long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method provided by the present invention further includes: after all fracturing operations are completed, reusing the cross-layer borehole as at least one of gas extraction borehole, coal seam water injection borehole or stress monitoring borehole.

[0016] This invention also provides a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing system, comprising: a high-pressure pump station located in a first roadway and configured to output high-pressure fluid; a cross-layer borehole passing through the coal and rock mass between the first and second roadways, the borehole being connected to the high-pressure pump station at its opening end in the first roadway, configured to transport high-pressure fluid from the first roadway to the second roadway; a high-pressure water distribution device located in the second roadway and connected to the opening end of the cross-layer borehole in the second roadway, the high-pressure water distribution device including an inlet and multiple outlet branches, each outlet branch being equipped with an independently controlled valve; multiple high-pressure branch pipes, one end of each high-pressure branch pipe being connected to an outlet branch, and the other end being connected to a fracturing borehole on the side of the second roadway; the high-pressure pump station, the cross-layer borehole, the high-pressure water distribution device, and each high-pressure branch pipe are connected to form a fluid supply network from a single pump station to multiple fracturing boreholes.

[0017] The present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements any of the above-described long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing methods.

[0018] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the above-described long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing methods.

[0019] The long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method and system provided by this invention, by forming a cross-layer borehole in the coal and rock mass between the first and second roadways, shifts the high-pressure fluid delivery channel from the open-laid roadway to the interior of the coal and rock mass. This not only eliminates the safety hazard of pipe bursts and injuries caused by open-laid high-pressure pipelines in the roadway, but also allows the fluid supply path to cross the coal and rock mass in a straight line, thus achieving the shortest path delivery and reducing pressure loss along the way. By arranging the high-pressure pump station in the first roadway and the high-pressure water distribution device at the borehole end of the cross-layer borehole located in the second roadway, the high-pressure pump station does not need to be relocated once it is set up, eliminating the project interruption and time consumption caused by repeated relocation of the pump station. Furthermore, by connecting the multiple outlet branches of the high-pressure water distribution device to each fracturing borehole in multiple drilling sites on the side of the second roadway, a system is constructed... A centralized fluid supply network was established, connecting a single pump station to each fracturing borehole via a cross-layer borehole and a water distribution device. This allowed all drilling sites to share the same main fluid supply system, establishing a physical connection and foundation for collaborative operations among multiple drilling sites. Furthermore, by switching the on / off states of the outlet branches of the high-pressure water distribution device, high-pressure fluid was transported through the cross-layer borehole to the water distribution device and then distributed to each fracturing borehole. This enabled a single fixed pump station to selectively supply fluid to multiple drilling sites as needed, avoiding equipment idleness and resource waste caused by independently configuring pump stations at each drilling site. Simultaneously, branch switching achieved seamless connection between different drilling sites, eliminating non-operational waiting time during site switching, improving the continuity of fracturing operations and equipment utilization. Thus, under the premise of eliminating safety hazards, centralized fluid supply and collaborative fracturing of multiple drilling sites with a single pump were achieved, shortening the overall cycle of the fracturing project. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic flowchart of a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method provided in an embodiment of the present invention.

[0022] Figure 2 This is a schematic cross-sectional view of a long-distance directional through-layer liquid supply hole provided in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of a multi-drilling-field diversion control device provided in an embodiment of the present invention.

[0024] Figure 4 This is a structural block diagram of an intelligent monitoring and control system provided in an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the topology of a multi-hole liquid supply network for a single pump provided in an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of a collaborative fracturing construction process provided in an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the overall layout of a long-distance directional trans-layer pump multi-hole centralized liquid supply system provided in an embodiment of the present invention. Detailed Implementation

[0028] 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.

[0029] The following is combined with Figure 1 This invention describes a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method. For consistency, the entity executing this method will be uniformly named "system," and will not be described further thereafter.

[0030] Figure 1 This is a schematic diagram of the process of a long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method provided by an embodiment of the present invention, as shown below. Figure 1 As shown, the method includes the following: S101, Forming a through-layer borehole.

[0031] Among them, the cross-layer borehole passes through the coal and rock mass between the first and second roadways, serving as a high-pressure fluid transport channel across the roadways.

[0032] For example, the first roadway refers to the roadway where the high-pressure pump station is located; the second roadway refers to the roadway where multiple drilling sites are located.

[0033] Specifically, if the first roadway is a return airway, the second roadway is a main haulage roadway. The return airway is a roadway arranged along the return air side of the working face, and the main haulage roadway is a roadway arranged along the haulage side of the working face. The two roadways are separated by coal and rock pillars.

[0034] In this embodiment of the invention, the cross-layer drilling adopts long-distance directional drilling.

[0035] For example, long-distance directional drilling refers to drilling constructed using directional drilling technology, which can precisely control the spatial trajectory of the borehole and penetrate the coal and rock mass between two roadways. It serves as a concealed delivery channel for high-pressure fracturing fluid, replacing the traditional open-laid high-pressure pipelines in roadways.

[0036] In some embodiments, the drilling trajectory can be determined based on the spatial coordinate relationship between the first tunnel and the second tunnel.

[0037] For example, based on the spatial coordinate relationship between the return airway and the main haulage roadway, the occurrence conditions of the coal and rock strata, and the stability of the surrounding rock, borehole trajectory design software is used for three-dimensional optimization.

[0038] Specifically, the design principle of the drilling trajectory is to minimize the path, traverse stable strata, and locate the final hole at a predetermined position in the second roadway.

[0039] For example, the final hole point is located within 1.0m to 2.0m from the bottom plate on the side of the main haulage roadway.

[0040] Furthermore, directional drilling is carried out using a directional drilling rig in conjunction with a measurement-while-drilling system.

[0041] In this embodiment of the invention, the directional drilling rig is used to adjust the drilling direction based on the inclination and azimuth angles of the borehole collected in real time by the measurement-while-drilling system.

[0042] For example, a kilometer-long directional drilling rig can be selected as the drilling equipment, equipped with a measurement-while-drilling system to achieve real-time monitoring and precise control of the borehole trajectory.

[0043] Specifically, directional drilling is carried out by drilling a hole in the sidewall of the first roadway. During the drilling process, the measurement-while-drilling system collects dip and azimuth data at 3-meter intervals and transmits the data to the drilling rig control console in real time. Based on the trajectory data fed back by the measurement-while-drilling system, the operator adjusts the drilling direction in real time by adjusting the tool face angle of the borehole directional drilling tool, and dynamically corrects the borehole trajectory to ensure that the deviation of the final hole position is controlled within the preset allowable deviation, thus forming a high-precision cross-roadway and cross-layer passage.

[0044] For example, the preset allowable deviation can be set to 0.5m.

[0045] In actual drilling, the borehole diameter can be 96mm to 120mm, and the borehole length can be 80m to 300m for cross-layer drilling.

[0046] In this embodiment of the invention, the borehole diameter is 96mm, the borehole length is 235m, the final hole position deviation is 0.3m, the trajectory measurement interval is 3m / time, and the opening inclination angle is 12°; the opening inclination angle range is generally 8° to 25°.

[0047] Furthermore, a borehole casing is inserted into the opening section of the first roadway and grout is injected to solidify the casing, forming a cross-layer borehole as a high-pressure fluid transport channel across the roadway.

[0048] For example, the borehole section is drilled 5m to 8m using a Φ120mm drill bit, and a borehole casing is lowered and grout is injected to solidify the casing; after the cement grout has solidified, a Φ96mm drill bit is used for directional drilling to form a borehole sealing foundation and a through-layer drilling channel.

[0049] Thus, by constructing long-distance directional cross-layer boreholes in the coal and rock mass between the first and second roadways, the present invention transfers the high-pressure fluid transport channel from the open roadway to the interior of the coal and rock mass, allowing the high-pressure liquid to flow deep within the surrounding rock throughout the entire process, thereby eliminating the safety hazard of high-pressure pipeline rupture and injury within the roadway.

[0050] The following is combined with Figure 2 The structure of the through-layer liquid supply hole will be further explained.

[0051] Figure 2 This is a schematic cross-sectional view of a long-distance directional through-layer liquid supply hole provided in an embodiment of the present invention. Figure 2 As shown, the long-distance directional through-layer fluid supply hole includes, in sequence along the borehole axis, a pump station side connection section, an inner casing section, and a diversion interface section.

[0052] The pump station side connection section is equipped with a flange connector for sealing connection with the output pipeline of the high-pressure pump station or the inlet pipeline of the water distribution device.

[0053] In this embodiment of the invention, both ends of the through-layer liquid supply hole are provided with pump station side connection sections, located on the main haulage roadway side and the return air roadway side respectively, which can realize bidirectional liquid supply.

[0054] The inner casing section is equipped with a high-pressure steel casing, which is solidified with the borehole wall through a cement grouting layer to form a pressure-bearing and sealing structure.

[0055] For example, the high-pressure steel bushing can be Φ73 / Φ89, that is, a high-strength seamless steel pipe with an outer diameter of 89mm and an inner diameter of 73mm.

[0056] The coal and rock mass is the surrounding rock medium through which the liquid supply hole passes. The high-pressure steel casing is installed in the borehole inside the coal and rock mass and is tightly bonded to the surrounding rock through a cement slurry consolidation layer to ensure sealing performance and structural stability during the high-pressure liquid supply process.

[0057] The diversion interface section is equipped with a diversion interface, which is used to distribute the high-pressure fluid delivered by the through-layer fluid supply hole to multiple branch pipelines, which are connected to different drilling sites and boreholes respectively.

[0058] S102. The high-pressure pump station is arranged in the first roadway and connected to the opening end of the through-layer borehole in the first roadway.

[0059] In some embodiments, the high-pressure pump station is fixedly arranged near the opening of the through-layer borehole in the first roadway.

[0060] The high-pressure pump station is kept in a fixed position after it is set up during fracturing operations.

[0061] For example, the high-pressure pump station system includes an emulsion pump group, a liquid storage tank and a programmable logic controller (PLC) integrated control console arranged in parallel. The pump station system is located near the borehole opening of the through-layer drilling, at a distance of no more than 20m.

[0062] Specifically, two emulsion pumps can be configured in parallel, equipped with a stainless steel water tank and a PLC integrated control console. The rated flow rate of the emulsion pumps is 120 liters / minute. The emulsion pump set, water tank, and PLC integrated control console are arranged on the roadway floor near the borehole opening of the first roadway. The pump station equipment is fixed by ground anchors to ensure stability under high-pressure operation. The pump station outlet is connected to the borehole opening of the cross-layer through a high-pressure connection pipeline with a flange seal. The flange pressure rating is not lower than the fracturing operation pressure to ensure that the high-pressure fracturing fluid is injected into the cross-layer borehole without leakage. After the pump station system is installed and fixed at once, it remains in a fixed position throughout the entire fracturing operation and does not need to be disassembled and moved when the drilling site is relocated.

[0063] Thus, by fixing the high-pressure pump station in the first roadway and sealing it with the cross-layer borehole, the present invention eliminates the need for relocation of the high-pressure pump station during the entire fracturing operation after a single installation, thus eliminating the project interruption and time consumption caused by repeated relocation of the pump station.

[0064] S103. Arrange the high-pressure water distribution device at the end of the borehole in the second roadway of the cross-layer borehole.

[0065] Among them, the high-pressure water distribution device is used to distribute a single high-pressure fluid into multiple high-pressure fluids.

[0066] In this embodiment of the invention, the high-pressure water distribution device includes an inlet and multiple outlet branches.

[0067] Each outlet branch is equipped with an independently controlled valve, and the entrance is connected to the borehole end of the second roadway.

[0068] For example, the number of outlet branches of the high-pressure water distribution device is determined according to the drilling site and the number of boreholes, and is generally 6 to 12.

[0069] Specifically, the inlet side of the high-pressure water distribution device is sealed to the end of the cross-layer borehole in the second roadway via a flange, with a flange pressure rating of 50 MPa; each outlet branch on the outlet side is connected to the fracturing borehole of each drilling site via a high-pressure hose; each outlet branch is equipped with an independent valve that can control the on / off state of the corresponding branch, and by combining the opening and closing of different valves, the fluid supply can be switched arbitrarily between single borehole, single drilling site, or combined drilling site.

[0070] In real-world scenarios, anti-vibration pressure gauges or pressure sensors with a range of 0 MPa to 60 MPa can be installed on each outlet branch to monitor the changes in fracturing pressure in each branch in real time.

[0071] Thus, by setting a high-pressure water distribution device on the second roadway side of the cross-layer borehole, the present invention distributes a single high-pressure fluid into multiple independent and controllable branch fluids, providing a distribution hub for multi-drilling site collaborative fracturing, enabling a single pump station to selectively supply fluid to multiple drilling sites as needed.

[0072] In this embodiment of the invention, the high-pressure water distribution device adopts a flow collector and distributor.

[0073] The distributor contains a high-pressure manifold, with the inlet and multiple outlet branches connected to it. Each outlet branch is equipped with an independent high-pressure shut-off valve.

[0074] For example, the high-pressure water distribution device adopts an integrally forged multi-channel manifold distributor structure, made of high-strength alloy steel, and its pressure resistance rating meets the highest pressure requirements of fracturing operations.

[0075] Specifically, the flow distributor is a cylindrical or polyhedral flow block structure with a high-pressure manifold inside. The high-pressure manifold is a chamber structure located inside the water distribution device, used to collect the inlet fluid and distribute it evenly to each branch. A single large-diameter flange interface is provided on the inlet side for connection to the end of the through-layer borehole. Multiple branch interfaces are evenly distributed along the circumference or axis on the outlet side. Each branch interface is connected to a high-pressure shut-off valve and a pressure monitoring element from the inside to the outside, forming an independent and controllable liquid supply branch. The overall structure is compact and can be installed on a special bracket on the sidewall of the second roadway.

[0076] Thus, by employing an integrally forged multi-channel manifold distributor as a high-pressure water distribution device, this invention ensures the structural strength and sealing performance of the device, enabling it to reliably withstand the repeated action of high-pressure fracturing fluid. At the same time, the independent and controllable design of each branch makes fluid supply switching flexible and convenient.

[0077] The following is combined with Figure 3 The structure of the high-pressure water separator will be further explained.

[0078] Figure 3 This is a schematic diagram of a multi-drilling-field diversion control device provided in an embodiment of the present invention. Figure 3 As shown, the multi-drilling-site diversion control device includes a main inlet pipeline, multiple diversion branches, and corresponding control and monitoring elements.

[0079] One end of the main inlet pipeline is the inlet side, which is connected to the through-layer liquid supply hole or the pump station output end; the other end extends to form the main pipeline, and multiple branch pipelines branch off from the main pipeline.

[0080] In this embodiment of the invention, the entrance side is the main transport roadway side, and the exit side is the return air roadway side, or the arrangement can be reversed according to the layout direction.

[0081] For example, a pressure gauge, multiple flow meters, and a safety relief valve are sequentially installed along the fluid flow direction on the main pipeline.

[0082] The pressure gauge is used to monitor the pressure data of the main pipeline in real time; the flow meter is used to monitor the flow data of each branch pipeline in real time; and the safety relief valve is used for automatic pressure relief protection when the system is overpressured.

[0083] Each branch is equipped with a ball valve to independently control the on / off state of the corresponding branch.

[0084] In this embodiment of the invention, the diversion branch includes multiple branches on the main haulage roadway side and multiple branches on the return airway side, which are respectively connected to the main haulage roadway drilling site 1, main haulage roadway drilling site 2, main haulage roadway drilling site 3, main haulage roadway drilling site 4, and multiple drilling sites such as return airway drilling site A1, return airway drilling site A2, return airway drilling site B1, and return airway drilling site B2.

[0085] In this way, by independently controlling the ball valves on each branch, fluid supply can be switched arbitrarily between single boreholes, single drilling sites, or combined drilling sites, meeting the scheduling requirements of multi-drilling site coordinated fracturing.

[0086] In this embodiment of the invention, the valves of each outlet branch are electro-hydraulic high-pressure valves, and the switching of each valve is centrally controlled by a remote control console.

[0087] For example, valves can be remotely controlled via a remote control console, and pressure data collected by pressure sensors in each branch can be used to achieve centralized control from the ground or in the chamber.

[0088] Specifically, the control cables of each electro-hydraulic high-pressure valve are connected to a remote control console, which can be set up in the tunnel chamber or the ground dispatch room. Operators can centrally control the opening and closing status of each outlet branch valve through the remote control console. With the data acquisition of each branch pressure sensor, the pressure data of each branch can be displayed in real time on the remote control console, realizing centralized monitoring and remote control of fracturing operations.

[0089] Alternatively, the valve can be switched on and off manually.

[0090] For example, operators can manually operate the opening and closing of the high-pressure shut-off valves of each branch at the high-pressure water distribution device in the second roadway, according to the fracturing plan, to switch the liquid supply branches.

[0091] Thus, by employing two optional schemes—manual control mode and electro-hydraulic remote control mode—this invention allows operators to stay away from high-pressure danger zones, improving the safety and automation level of fracturing operations, while also enhancing the response speed and accuracy of fluid supply scheduling.

[0092] The following is combined with Figure 4 The intelligent monitoring and control system will be further explained.

[0093] Figure 4 This is a structural block diagram of an intelligent monitoring and control system provided in an embodiment of the present invention. Figure 4 As shown, the intelligent monitoring and control system includes a front-end sensing unit, a data acquisition unit, a control unit, a communication unit, and a higher-level monitoring unit.

[0094] The front-end sensing unit includes a pressure sensor, a flow sensor, a temperature sensor, and a liquid level sensor, which are respectively set at the corresponding positions in the liquid supply system to collect parameter data such as pressure, flow rate, temperature, and liquid level in real time.

[0095] The data acquisition unit includes a data acquisition module (AI / DI), which is connected to the signals of each sensor and is used to acquire the analog signals output by the front-end sensing unit and convert them into digital signals.

[0096] The control unit includes a programmable logic controller (PLC), which outputs control signals according to preset control logic or host computer instructions to drive the corresponding actuators to operate.

[0097] The communication unit includes a communication module, which is used to realize data transmission and command interaction between the downhole equipment and the ground host computer.

[0098] The upper-level monitoring unit includes a host computer and a remote monitoring platform, which is used to display various monitoring parameters in real time, store historical data, issue control commands, and realize remote monitoring.

[0099] In addition, the system includes a local display screen, data storage devices, and alarm devices. The local display screen is used to display monitoring data in real time on-site; the data storage devices are used to store historical data; and the alarm devices are used to automatically issue alarm signals when the monitoring data exceeds a preset safety threshold.

[0100] S104. Connect the multiple outlet branches of the high-pressure water distribution device to the fracturing boreholes in the multiple drilling sites on the side of the second roadway.

[0101] In some embodiments, multiple outlet branches of the high-pressure water distribution device can be connected to each fracturing borehole in multiple drilling sites on the side of the second roadway via high-pressure branch pipes, forming a fluid supply path from the high-pressure pump station through the cross-layer borehole and the high-pressure water distribution device to each fracturing borehole.

[0102] For example, the high-pressure branch pipe can be a high-pressure hose with a rated pressure of 40 MPa and a burst pressure of not less than 120 MPa. For instance, a four-layer steel wire wound high-pressure hose can be selected.

[0103] Specifically, high-pressure branch pipelines are laid from each outlet branch of the high-pressure water distribution device along the second roadway towards each drilling site; the terminals of the branch pipelines and the sealing fluid injection interfaces of each fracturing borehole can be connected by quick couplings, which are reliable and easy to install and disassemble.

[0104] Thus, by connecting each outlet branch of the high-pressure water distribution device to the fracturing boreholes of each drilling site via high-pressure branch pipes, the present invention constructs a complete terminal fluid supply network, enabling high-pressure fracturing fluid to be reliably delivered to each fracturing borehole.

[0105] In this embodiment of the invention, the centralized liquid supply network has a four-level node tree topology, and the entire liquid supply network is composed of four levels of nodes connected in series.

[0106] For example, the first-level node is a fixed pump station in the first roadway, serving as the pressure source node of the entire fluid supply network; the second-level node is a long-distance directional cross-layer borehole, serving as the main transport channel node across roadways, concealingly transporting high-pressure fluid from the first roadway to the second roadway; the third-level node is a high-pressure water distribution device in the second roadway, serving as a multi-branch distribution hub node, distributing single-path high-pressure fluid into multiple-path branch fluids; and the fourth-level node is each fracturing borehole in each drilling site, serving as the terminal operation node.

[0107] Specifically, the fluid path is as follows: pump station, connecting pipeline, through-layer orifice, through-layer borehole, water distributor inlet, water distributor manifold, branch valves, branch pipeline, sealing device, fracturing borehole, forming a complete fluid supply path from the fixed pump station to each fracturing borehole.

[0108] The following is combined with Figure 5 The topology of the liquid supply network will be further explained.

[0109] Figure 5 This is a schematic diagram of the topology of a multi-hole liquid supply network for a single pump provided in an embodiment of the present invention. Figure 5 As shown, the fluid supply network adopts a tree-like topology structure with a single pump source and multi-level diversion, including the main fluid supply source, inter-layer fluid supply holes, diversion nodes, and terminal drilling sites.

[0110] The main fluid supply source is a fixed high-pressure pump station, located in the middle of the system, which serves as the pressure source for the entire fluid supply network and outputs high-pressure fracturing fluid.

[0111] The cross-layer fracturing fluid supply port is the main fluid supply pipeline, which runs through the coal and rock pillar to transport high-pressure fracturing fluid from the pump station to the roadways on both sides. As the main channel of the fluid supply network, the cross-layer fracturing fluid supply port enables concealed high-pressure fluid transportation across roadways.

[0112] Diversion nodes are located at both ends of the through-layer fluid supply port to distribute the high-pressure fluid from the main pipeline into multiple branch fluids. In this embodiment of the invention, the diversion node includes control valves that can independently control the on / off state of each branch.

[0113] The terminal drilling sites include multiple drilling sites on the side of the main haulage roadway and multiple drilling sites on the side of the return airway.

[0114] For example, the main haulage roadway drilling site includes drilling site 1, drilling site 2, drilling site 3, and drilling site 4; the return airway drilling site includes drilling site A1, drilling site A2, drilling site B1, and drilling site B2. Each drilling site corresponds to a branch line, and each branch line is led out from the branch node and connected to the fracturing borehole of the corresponding drilling site.

[0115] In this way, the entire fluid supply network takes fixed high-pressure pump stations as the source, cross-layer fluid supply holes as the main trunk, and diversion nodes as branch points, forming a centralized fluid supply pattern of one pump and multiple holes, which can realize selective fluid supply from a single pump station to multiple drilling sites and multiple boreholes.

[0116] S105. By switching the on / off of each outlet branch of the high-pressure water distribution device, the high-pressure fluid provided by the high-pressure pump station is transported to the high-pressure water distribution device through the cross-layer borehole, and then distributed to each fracturing borehole by the high-pressure water distribution device.

[0117] In some embodiments, fluid can be supplied to each fracturing borehole in a sequential, assembly-line operation sequence, by switching the on / off state of each outlet branch.

[0118] For example, the collaborative fracturing operation adopts a production line-style operation sequence of fracturing one site and one hole at a time, with one site prepared for each fracturing operation.

[0119] Specifically, the exit branch corresponding to the first drilling site is opened to carry out fracturing operations on the fracturing boreholes within the first drilling site.

[0120] In actual operations, the fracturing pressure is set by the pump station pressure regulating valve. For example, it can be set to 25 MPa to 35 MPa; the fracturing time per hole is determined according to the fracturing fluid volume and pumping rate, generally 30 to 60 minutes per hole; the fracturing fluid type is water or modified fracturing fluid with drag reducers and permeability enhancers added.

[0121] In this embodiment of the invention, while high-pressure fluid is introduced into the fracturing borehole of the current drilling site for fracturing operations, the next drilling site prepares for borehole sealing and pipeline connection.

[0122] For example, during fracturing operations at the first drilling site, preparations for borehole sealing and pipeline connections are carried out simultaneously at the second drilling site, including the installation of sealing devices, connection of branch pipelines, and pressure testing.

[0123] Furthermore, after the fracturing operation at the current drilling site is completed, the corresponding outlet branch of the high-pressure water distribution device is switched to transport the high-pressure fluid to the fracturing borehole of the next drilling site, until the fracturing operation at all drilling sites is completed.

[0124] For example, after all borehole fracturing is completed at the first drilling site, the outlet branch of the high-pressure water distribution device corresponding to the first drilling site is closed, and the outlet branch corresponding to the second drilling site is opened to begin fracturing at the second drilling site; the same applies to the third and fourth drilling sites, enabling continuous fracturing operations without relocation waiting time. During the switching of drilling sites, the fixed pump station remains in continuous operation without interruption.

[0125] Thus, this invention transforms the traditional serial and intermittent fracturing operation into a parallel and continuous operation with multiple drilling sites by adopting a pipeline-style collaborative fracturing operation sequence of one site and one hole, eliminating the non-operational waiting time during drilling site switching, improving the continuity of fracturing operations and equipment utilization, and shortening the overall cycle of fracturing projects.

[0126] The following is combined with Figure 6 The collaborative fracturing construction process will be further explained.

[0127] Figure 6 This is a schematic diagram of a collaborative fracturing construction process provided by an embodiment of the present invention. Figure 6 As shown, the collaborative fracturing operation process includes the following steps: 1) Construction of fluid supply through-layer boreholes. Long-distance directional through-layer boreholes are constructed using directional drilling technology to serve as the main channels for high-pressure fluid supply.

[0128] 2) Install casing and cement well. Run the casing into the opening section of the cross-layer borehole and grout it to form a pressure-bearing and sealing structure.

[0129] 3) Connect the diversion control device. Install a high-pressure water distribution device at the end of the through-layer borehole and connect the liquid supply pipelines of each branch.

[0130] 4) System pressure test. Perform a high-pressure test on the entire liquid supply system to check the system's sealing performance and pressure resistance.

[0131] 5) Single-hole fracturing. Select a single borehole for fracturing commissioning to verify the system operating parameters and fracturing effect.

[0132] 6) Sequential fracturing. Fracturing operations are carried out sequentially in the order of site by site and hole by hole, i.e., fracturing in the order of 1, 2, 3 to N.

[0133] 7) Multi-site coordinated fracturing. According to the construction plan, simultaneous fracturing or group coordinated fracturing is carried out in multiple drilling sites to achieve coordinated operation of multiple drilling sites.

[0134] 8) Fracturing monitoring. During the fracturing process, parameters such as pressure and flow rate are monitored in real time to track the fracturing operation status.

[0135] 9) End fracturing / shut-in. After completing all fracturing operations, close all branch valves to end the fracturing operation.

[0136] 10) Maintain pipeline pressure for standby use. After fracturing is completed, the pipeline is kept at a certain pressure for standby use, or connected to other uses, such as gas extraction, coal seam water injection, etc., to achieve multiple uses for one pipeline.

[0137] Optionally, the present invention can also adopt various fracturing process sequences such as alternating across drilling sites and parallel grouping according to actual needs, and flexibly arrange the fracturing operation process.

[0138] For example, cross-drilling site alternation means that when the fracturing pressure of a certain drilling site is abnormal or the fracturing parameters need to be adjusted, the fracturing operation can be temporarily switched to another ready drilling site, and the operation can be continued at the original drilling site after the problem is solved. Through the flexible switching of the independent valves of each branch of the water distribution device, any fluid supply mode for single hole, single drilling site or combined drilling sites can be realized.

[0139] In the long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method provided by this invention, a cross-layer borehole is formed in the coal and rock mass between the first and second roadways, transferring the high-pressure fluid delivery channel from the open-laid roadway to the interior of the coal and rock mass. This not only eliminates the safety hazard of pipe bursts and injuries caused by the open-laid high-pressure pipeline in the roadway, but also allows the fluid supply path to pass through the coal and rock mass in a straight line, thus achieving the shortest path delivery and reducing pressure loss along the way. By arranging the high-pressure pump station in the first roadway and the high-pressure water distribution device at the borehole end of the cross-layer borehole located in the second roadway, the high-pressure pump station does not need to be relocated once it is set up, eliminating the project interruption and time consumption caused by repeated relocation of the pump station. Furthermore, by connecting the multiple outlet branches of the high-pressure water distribution device to each fracturing borehole in multiple drilling sites on the side of the second roadway, a system is constructed... A centralized fluid supply network, consisting of a single pump station connected to each fracturing borehole via a cross-layer borehole and a water distribution device, allows all drilling sites to share the same main fluid supply system, establishing a physical connection and foundation for collaborative operations among multiple drilling sites. Furthermore, by switching the on / off state of each outlet branch of the high-pressure water distribution device, high-pressure fluid is transported via the cross-layer borehole to the water distribution device and then distributed to each fracturing borehole. This enables a single fixed pump station to selectively supply fluid to multiple drilling sites as needed, avoiding equipment idleness and resource waste caused by independently configuring pump stations at each drilling site. Simultaneously, branch switching achieves seamless connection between different drilling sites, eliminating non-operational waiting time during site switching, improving the continuity of fracturing operations and equipment utilization. Thus, under the premise of eliminating safety hazards, centralized fluid supply and collaborative fracturing of multiple drilling sites with a single pump are achieved, shortening the overall cycle of fracturing projects.

[0140] Optionally, after all fracturing operations are completed, the cross-layer borehole can be reused as at least one of the following: gas extraction borehole, coal seam water injection borehole, or stress monitoring borehole.

[0141] Among them, gas extraction holes refer to boreholes connected to the mine's gas extraction pipeline network for extracting coal seam gas; coal seam water injection holes refer to boreholes used to inject static pressure water into the coal seam to achieve coal seam water injection and dust prevention; and stress monitoring holes refer to boreholes installed with stress sensors for monitoring mine pressure.

[0142] For example, after all fracturing operations are completed, the water distribution device is disassembled, and the borehole opening of the first roadway side-penetrating layer is connected to the mine gas extraction pipeline network to extract coal seam gas using the fracture network after fracturing and permeability enhancement.

[0143] Specifically, during fracturing, the cross-layer borehole serves as the main high-pressure fluid supply channel, undertaking the cross-roadway transport of all fracturing fluid. After fracturing, during the gas extraction phase, the cross-layer borehole on the side of the first roadway is connected to the mine's gas extraction pipeline network. Depending on the mine's needs, this borehole can also be used as a coal seam water injection hole for static pressure water injection or as a stress monitoring hole for monitoring mine pressure.

[0144] Thus, by reusing the cross-layer boreholes after fracturing as gas extraction holes, coal seam water injection holes, or stress monitoring holes, this invention achieves multiple reuses in a single drilling operation, significantly improving the overall utilization rate of boreholes, reducing the amount of repeated drilling in the mine, saving overall engineering costs, and allowing for immediate connection to extraction after fracturing and permeability enhancement, ensuring a close connection between gas control effects.

[0145] The following is combined with Figure 7 The long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing system of the present invention will be described.

[0146] This invention provides a long-distance directional cross-layer single-pump multi-hole centralized liquid supply system, which includes: a high-pressure pump station, cross-layer boreholes, a high-pressure water distribution device, and multiple high-pressure branch pipes.

[0147] The system includes a high-pressure pump station located in the first roadway, configured to output high-pressure fluid; a cross-layer borehole penetrating the coal and rock mass between the first and second roadways, with its borehole end in the first roadway connected to the high-pressure pump station, configured to transport high-pressure fluid from the first roadway to the second roadway; a high-pressure water distribution device located in the second roadway and connected to the borehole end of the cross-layer borehole in the second roadway, the high-pressure water distribution device including one inlet and multiple outlet branches, each outlet branch equipped with an independently controlled valve; multiple high-pressure branch pipes, each high-pressure branch pipe having one end connected to an outlet branch and the other end connected to a fracturing borehole on the side of the second roadway; the high-pressure pump station, cross-layer borehole, high-pressure water distribution device, and each high-pressure branch pipe are connected to form a fluid supply network from a single pump station to multiple fracturing boreholes.

[0148] In this embodiment of the invention, the system adopts an overall layout with a single pump station centrally located and bidirectional fluid supply through perforations. The first and second roadways are arranged in parallel, separated by coal and rock pillars.

[0149] In embodiments of the present invention, such as Figure 7 As shown, the first tunnel is a return air tunnel, and the second tunnel is a main haulage tunnel; multiple return air tunnel drilling sites are arranged on the side of the return air tunnel, and multiple main haulage tunnel drilling sites are arranged on the side of the main haulage tunnel.

[0150] A fixed high-pressure pump station is located in the middle between the two roadways, serving as the pressure source for the entire fluid supply system. Long-distance directional cross-layer fluid supply holes penetrate the coal and rock pillars in a direction perpendicular to the roadway direction, delivering the high-pressure fracturing fluid output from the fixed high-pressure pump station to each drilling site on the return airway side and the main haulage roadway side.

[0151] For example, multiple drilling sites such as Return Airway Drilling Site A1, Return Airway Drilling Site A2, Return Airway Drilling Site B1, and Return Airway Drilling Site B2 are arranged on the side of the return airway; multiple drilling sites such as Main Transport Roadway Drilling Site 1, Main Transport Roadway Drilling Site 2, Main Transport Roadway Drilling Site 3, and Main Transport Roadway Drilling Site 4 are arranged on the side of the main transport roadway.

[0152] In this embodiment of the invention, the fluid supply pipeline includes a main fluid supply pipe and branch fluid supply pipes. The main fluid supply pipe is a long-distance directional cross-layer fluid supply hole, which is set inside the coal and rock pillar; the branch fluid supply pipes branch off from both ends of the cross-layer fluid supply hole and connect to the fracturing boreholes of each drilling site.

[0153] In addition, the system is equipped with a return water pipeline and a pressure relief pipeline for pressure relief or return water after fracturing is completed.

[0154] In this embodiment of the invention, a high-pressure pump station is located near the borehole of the cross-section borehole in the first roadway. The high-pressure pump station includes an emulsion pump unit, a liquid storage tank, and a programmable logic controller (PLC) integrated control console, which is fixed to the floor of the first roadway by ground anchors. The PLC integrated control console is used to regulate the pressure and flow rate of the output liquid. The outlet of the high-pressure pump station is connected to the inlet end of the cross-section borehole through a flange interface with a pressure resistance rating not lower than the fracturing operation pressure.

[0155] In this embodiment of the invention, the through-layer drilling is a high-precision drilling constructed using long-distance directional drilling technology. The opening section is equipped with a borehole sleeve, and the sleeve is solidified by cement grouting to form a pressure-bearing and sealing structure.

[0156] In this embodiment of the invention, the high-pressure water distribution device is a multi-channel manifold distributor that is integrally forged and has a high-pressure manifold cavity inside; each outlet branch is equipped with an independent high-pressure shut-off valve and a pressure monitoring element.

[0157] In this embodiment of the invention, the high-pressure branch pipe is a four-layer steel wire wound high-pressure hose, and each high-pressure branch pipe is suspended and laid along the side of the second roadway and tied in groups according to the drilling site; the end of the high-pressure branch pipe is connected to the sealing fluid injection interface of the fracturing borehole opening through a quick connector.

[0158] In this embodiment of the invention, the liquid supply network has a four-level node tree topology. The entire system takes the through-layer drilling as the main trunk and the high-pressure water distribution device as the branch point, forming a centralized liquid supply pattern of one pump and multiple holes.

[0159] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method provided by the above methods. The method includes: forming a cross-layer borehole that passes through the coal and rock mass between a first roadway and a second roadway, serving as a cross-roadway high-pressure fluid transport channel; arranging a high-pressure pump station in the first roadway and connecting the high-pressure pump station to the borehole end of the cross-layer borehole located in the first roadway; arranging a high-pressure water distribution device at the borehole end of the cross-layer borehole located in the second roadway, the high-pressure water distribution device being used to distribute a single high-pressure fluid into multiple high-pressure fluids; connecting multiple outlet branches of the high-pressure water distribution device to fracturing boreholes in multiple drilling sites on the side of the second roadway; and by switching the on / off of each outlet branch of the high-pressure water distribution device, transporting the high-pressure fluid provided by the high-pressure pump station through the cross-layer borehole to the high-pressure water distribution device, and distributing it to each fracturing borehole through the high-pressure water distribution device.

[0160] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method provided by the above methods. The method includes: forming a cross-layer borehole that passes through the coal and rock mass between a first roadway and a second roadway, serving as a high-pressure fluid transport channel across the roadways; arranging a high-pressure pump station in the first roadway and connecting the high-pressure pump station to the borehole end of the cross-layer borehole located in the first roadway; arranging a high-pressure water distribution device at the borehole end of the cross-layer borehole located in the second roadway, the high-pressure water distribution device being used to distribute a single high-pressure fluid stream into multiple high-pressure fluid streams; connecting multiple outlet branches of the high-pressure water distribution device to fracturing boreholes in multiple drilling sites on the side of the second roadway; and by switching the on / off states of each outlet branch of the high-pressure water distribution device, transporting the high-pressure fluid provided by the high-pressure pump station through the cross-layer borehole to the high-pressure water distribution device, and distributing it to each fracturing borehole through the high-pressure water distribution device.

[0161] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0162] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0163] 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 long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing method, characterized in that, The method includes: A cross-layer borehole is formed, which passes through the coal and rock mass between the first roadway and the second roadway, serving as a high-pressure fluid transport channel across the roadway; A high-pressure pump station is arranged in the first roadway, and the high-pressure pump station is connected to the opening end of the through-layer borehole in the first roadway. A high-pressure water distribution device is arranged at the opening end of the through-layer borehole located in the second roadway. The high-pressure water distribution device is used to distribute a single high-pressure fluid into multiple high-pressure fluids. The multiple outlet branches of the high-pressure water distribution device are respectively connected to each fracturing borehole in multiple drilling sites on the side of the second roadway; By switching the on / off state of each outlet branch of the high-pressure water distribution device, the high-pressure fluid provided by the high-pressure pump station is transported to the high-pressure water distribution device through the cross-layer borehole, and then distributed to each of the fracturing boreholes by the high-pressure water distribution device.

2. The method according to claim 1, characterized in that, The cross-layer borehole is formed by long-distance directional drilling; the formation of the cross-layer borehole includes: The drilling trajectory is determined based on the spatial coordinate relationship between the first tunnel and the second tunnel; Directional drilling is carried out using a directional drilling rig in conjunction with a measurement-while-drilling system. The directional drilling rig is used to adjust the drilling direction based on the borehole inclination and azimuth angles collected in real time by the measurement-while-drilling system. A borehole casing is inserted into the opening section of the first roadway and grout is injected to solidify the casing, forming the through-layer borehole as the high-pressure fluid transport channel across the roadway.

3. The method according to claim 1, characterized in that, The high-pressure pump station is fixedly arranged near the opening of the through-layer borehole in the first roadway, and its position remains fixed during the fracturing operation.

4. The method according to claim 1, characterized in that, The high-pressure water distribution device includes an inlet and multiple outlet branches. Each outlet branch is equipped with an independently controlled valve. The inlet is connected to the borehole end of the through-layer borehole located in the second roadway.

5. The method according to claim 1, characterized in that, The process of switching the on / off states of each outlet branch of the high-pressure water distribution device to transport the high-pressure fluid provided by the high-pressure pump station through the cross-layer borehole to the high-pressure water distribution device, and then distributing it to each of the fracturing boreholes through the high-pressure water distribution device, includes: By switching the on / off of each of the aforementioned outlet branches, fluid is supplied to each of the aforementioned fracturing boreholes in a sequential, assembly-line operation sequence, one site at a time; wherein, while the fracturing borehole of the current drilling site is being energized with high-pressure fluid for fracturing operations, the next drilling site is preparing for borehole sealing and pipeline connection. After the fracturing operation at the current drilling site is completed, the corresponding outlet branch of the high-pressure water distribution device is switched to transport the high-pressure fluid to the fracturing borehole of the next drilling site until the fracturing operation at all drilling sites is completed.

6. The method according to claim 4, characterized in that, The high-pressure water distribution device adopts a flow collector and distributor, which has a high-pressure confluence cavity inside. The inlet and multiple outlet branches are respectively connected to the high-pressure confluence cavity, and each outlet branch is equipped with an independent high-pressure shut-off valve.

7. The method according to claim 1, characterized in that, The step of connecting the multiple outlet branches of the high-pressure water distribution device to each fracturing borehole in multiple drilling sites on the side of the second roadway includes: The multiple outlet branches of the high-pressure water distribution device are connected to each fracturing borehole in multiple drilling sites on the side of the second roadway through high-pressure branch pipes, forming a fluid supply path from the high-pressure pump station through the cross-layer borehole and the high-pressure water distribution device to each fracturing borehole.

8. The method according to claim 4, characterized in that, The valves of each of the aforementioned outlet branches are electro-hydraulic high-pressure valves, and the on / off switching of each of the aforementioned valves is centrally controlled by a remote control console.

9. The method according to claim 1, characterized in that, The method further includes: After all fracturing operations are completed, the cross-layer boreholes will be reused as at least one of the following: gas extraction boreholes, coal seam water injection boreholes, or stress monitoring boreholes.

10. A long-distance directional cross-layer centralized fluid supply and coordinated hydraulic fracturing system, characterized in that, The system includes: A high-pressure pump station is located in the first roadway and is configured to output high-pressure fluid. A cross-layer borehole is drilled through the coal and rock mass between the first roadway and the second roadway. The cross-layer borehole is located at the borehole end of the first roadway and is connected to the high-pressure pump station. It is configured to transport the high-pressure fluid from the first roadway to the second roadway. A high-pressure water distribution device is arranged in the second roadway and connected to the borehole end of the through-layer borehole located in the second roadway. The high-pressure water distribution device includes an inlet and multiple outlet branches, and each outlet branch is equipped with an independently controllable valve. Multiple high-pressure branch pipes, one end of each high-pressure branch pipe is connected to one of the outlet branches, and the other end is connected to the fracturing borehole on the side where the second roadway is located; The high-pressure pump station, the cross-layer borehole, the high-pressure water distribution device, and each of the high-pressure branch pipes are connected to form a fluid supply network from a single pump station to multiple fracturing boreholes.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 9.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 9.

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