Self-adaptive intelligent liquid supply device for coal mine underground drilling and fracturing operation and control method

Abstract

The invention relates to the technical field of coal mine underground operation equipment, and provides a self-adaptive intelligent liquid supply device for coal mine underground drilling and fracturing operation and a control method. The main pump module is connected with the power module and is used for pressurizing the fluid and outputting the fluid with a first preset parameter; the control valve group is connected to an outlet of the main pump module; the control valve group is provided with two output ports of which the opening degree can be switched and adjusted; and the pressurizing module is connected with one of the output ports of the control valve group through a pressurizing pipeline and is used for pressurizing the fluid output by the main pump module and outputting the fluid with a second preset parameter. By means of the arrangement, the device has the advantages of being compact in structure and integrated in energy supply, the underground space is remarkably saved, the equipment carrying and installing links are reduced, the construction continuity and the operation efficiency are improved, intensification, high efficiency and safety of coal mine underground area pressure relief engineering can be achieved easily, and good application and popularization value is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of underground coal mine operation equipment, and in particular to an adaptive intelligent fluid supply device and control method for underground coal mine drilling and fracturing operations. Background Technology

[0002] In directional hydraulic fracturing and depressurization operations in underground coal mines, directional long-distance drilling and hydraulic fracturing are two core technologies. Currently, the industry generally uses two independent pumping equipment systems to complete the corresponding operations: the mud pump system is used in the drilling stage, undertaking the tasks of water circulation, cuttings carrying and drill bit cooling; the fracturing pump system is used in the rock fracturing stage, providing high-pressure water flow or sand-carrying liquid to achieve the expansion of fractures in the coal and rock mass.

[0003] Due to significant differences in performance requirements between the two types of equipment, mud pumps and fracturing pumps differ markedly in flow and pressure parameters: mud pumps have a rated flow rate of 200–600 L / min, a rated pressure of 3–5 MPa, a drive power of 90–250 kW, dimensions (in m) of 2.0 × 1.2 × 1.6, and a weight of 1.2–5.0 t. They typically employ a multi-plunger reciprocating structure or a high-pressure centrifugal pump type, characterized by high flow rate, low pressure, and strong wear resistance. In contrast, fracturing pumps have a rated flow rate of 20–150 L / min, a rated pressure of 30–80 MPa, a drive power of 150–500 kW, dimensions (in m) of 10.1 × 1.5 × 1.8, and a weight of 12–15 t. They are mostly high-pressure plunger pumps or hydraulic booster structures, characterized by low flow rate, high pressure, and high precision requirements.

[0004] However, in practical applications, it has been found that due to the extremely limited downhole working space, the configuration of two independent sets of equipment has many insurmountable drawbacks in practical applications: 1) It occupies a large space; the total volume of the two sets of equipment exceeds 10m². 3 It occupies 1.5 to 2.0 meters of the roadway cross-section. 2 This encroaches on work and safe passage space.

[0005] 2) Difficulty in relocation and installation: Each process change requires separate handling, installation and connection of pipelines, resulting in complex construction organization and long time consumption.

[0006] 3) Low equipment utilization rate: Even when a set of equipment is idle, it still occupies space and incurs maintenance costs, with a resource utilization rate of less than 50%.

[0007] 4) The system is expensive, with high costs for purchasing, transporting and maintaining dual equipment, significantly increasing the total investment in downhole operations.

[0008] 5) The pipeline layout is complex, with different pressure levels and pipe diameters interspersed, resulting in complicated on-site connections and increasing the risk of leakage and misoperation.

[0009] In view of the above problems, how to solve the problems of large space occupation, difficult relocation, high cost and low efficiency caused by the separate setting of existing dual-mode pump sets has become an important technical problem that urgently needs to be solved. Summary of the Invention

[0010] This invention provides an adaptive intelligent fluid supply device and control method for underground drilling and fracturing operations in coal mines. It addresses the shortcomings of existing dual-mode pump sets, such as large space occupation, difficult relocation, high cost, and low efficiency. It features a compact structure and integrated energy supply, significantly saving underground space, reducing equipment handling and installation, improving construction continuity and operational efficiency, and facilitating the intensive, efficient, and safe implementation of pressure relief projects in underground coal mines. It has significant potential for widespread application.

[0011] This invention provides an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, comprising an integrated unit: The power module is used to provide driving force; The main pump module, connected to the power module, is used to pressurize the fluid and output the fluid with a first preset parameter; A control valve assembly is connected to the outlet of the main pump module; the control valve assembly has two output ports that can be switched and adjusted in opening. The booster module is connected to one of the output ports of the control valve group via a booster pipeline. It is used to boost the fluid output by the main pump module and output fluid with a second preset parameter.

[0012] According to the present invention, an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines is provided, wherein the main pump module is configured as a three-cylinder reciprocating plunger pump with a rated pressure of 12MPa and a rated flow rate of 400L / min.

[0013] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, according to the present invention, includes a power module comprising: The drive unit is used to provide rotational driving force; The drive unit is connected to the main pump module via the speed reducer.

[0014] According to the present invention, an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines is provided, wherein the drive unit includes an electric motor or a diesel engine.

[0015] According to the present invention, an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines is provided, wherein the booster module includes a hydraulic booster cylinder and a high-pressure plunger pump.

[0016] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided by the present invention, comprises a control valve group including: The electromagnetic directional valve has one input port and two output ports. The input port of the electromagnetic directional valve is connected to the outlet of the main pump module. One of the output ports is used to connect to the drilling supply pipe through the drain pipe, and the other output port is connected to the booster module through the booster pipeline.

[0017] According to the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines provided by the present invention, the control valve group further includes: A proportional pressure regulating valve, connected to the booster pipeline, is used to regulate the pressure of the fluid input to the booster module; A pressure relief valve, connected to the pressurization pipeline, is used to overflow and relieve pressure when the pressure of the fluid exceeds a set value.

[0018] According to the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines provided by the present invention, the control valve group further includes: A one-way valve, connected to the booster pipeline, is used for the unidirectional flow of fluid from the main pump module to the booster module.

[0019] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided by the present invention, further includes a fluid supply and return system, wherein the fluid supply and return system comprises: Liquid storage tanks are used to store fluids; A suction line is used to connect the liquid storage tank and the main pump module; The drain pipe connects the output port of the booster module and another output port of the main pump module relative to the booster module to the borehole. The return channel is used to return the liquid discharged from the borehole to the storage tank.

[0020] According to the present invention, an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines is provided, wherein a one-way valve is connected to the fluid discharge pipeline for unidirectional flow of fluid to the borehole fluid supply pipe.

[0021] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided by the present invention, further includes a fluid supply and return system: A filtration device is installed inside the liquid storage tank to filter the fluid entering the suction pipe.

[0022] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided by the present invention, further includes a monitoring and control system, wherein the monitoring and control system comprises: The data acquisition module is used to acquire parameters of the fluid output by the main pump module and the booster module; The controller is communicatively connected to the data acquisition module, the power module, and the control valve group, and is used to adjust the fluid to preset parameters according to different working conditions.

[0023] According to the present invention, an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines is provided, wherein the data acquisition module includes a pressure sensor and a flow sensor.

[0024] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to the present invention further includes a monitoring and control system comprising: The human-computer interaction module is connected to the controller via signals; the human-computer interaction module is equipped with control keys for inputting control commands.

[0025] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided by the present invention, further includes a safety explosion-proof system, the safety explosion-proof system comprising: Hazard information acquisition module, used to collect hazard signals; The controller is connected to the hazard information acquisition module and is used to execute explosion-proof measures when the hazard signal exceeds a set value.

[0026] According to the present invention, an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines includes a hazard information acquisition module comprising a methane detection device and a pressure sensor; the explosion-proof measures include alarm, power cut-off, and pressure relief.

[0027] An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided by the present invention, further includes: The chassis, the power module, the main pump module and the booster module are integrated on the chassis; the chassis is provided with hoisting points and the bottom is provided with a walking component.

[0028] This invention also provides an adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines, applicable to the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines described in any of the above-mentioned embodiments, comprising the following steps: In drilling mode, the fluid is pressurized to the first preset parameter by the main pump module and then directly output to the borehole; In fracturing mode, the fluid is pressurized by the main pump module and then output through the pressurization pipeline to the pressurization module for further pressurization to the second preset parameter, and then output to the borehole.

[0029] According to the present invention, an adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines is provided. In the drilling mode, the booster module is in bypass mode, and the output pressure is maintained at 5-12 MPa and the flow rate is 400 L / min.

[0030] According to the present invention, an adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines is characterized in that, in the fracturing mode, pressure and flow curves are collected in real time, and the injection volume and time of the fracturing section are recorded. If an abnormal increase in pressure or a sudden drop in flow is detected, pressure relief and shutdown measures are implemented.

[0031] This invention provides an adaptive intelligent fluid supply device and control method for underground drilling and fracturing operations in coal mines. The power module provides the driving force, and through the cooperation of the main pump module, control valve group, and pressurization module, it can output fluids with different pressure and flow parameters according to different working conditions to meet the fluid pressure and flow requirements of different working conditions. Specifically, in drilling conditions, low-pressure, high-flow-rate fluid is required. In this case, after the fluid is drawn into the main pump module, it is pressurized to a first preset parameter and then directly output to the borehole, meeting the low-pressure, high-flow-rate requirements of drilling. In fracturing conditions, high-pressure, low-flow-rate fluid is required. In this case, the control valve group switches the output port. After the fluid is initially pressurized by the main pump module, it is output through the pressurization pipeline to the pressurization module for further pressurization to a second preset parameter, and then output to the borehole, meeting the high-pressure, low-flow-rate requirements of fracturing.

[0032] Compared to the simultaneous arrangement of two pumping systems in related technologies, this method can output two working media with different pressures and flow rates on a single device, thus integrating drilling fluid pumping and high-pressure fracturing into one unit. This effectively solves the problems of large space occupation, difficult relocation, high cost, and low efficiency caused by setting up separate dual-condition pump sets. It has the advantages of compact structure and integrated power supply, significantly saving downhole space, reducing equipment handling and installation, improving construction continuity and operational efficiency, and facilitating the intensive, efficient, and safe implementation of pressure relief projects in underground coal mines. It has good application value. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines provided in an embodiment of the present invention.

[0035] Figure 2 This is a hydraulic schematic diagram of an adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, provided in an embodiment of the present invention.

[0036] Figure 3 This is a flowchart of an adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines, provided in an embodiment of the present invention.

[0037] Figure label: 10. Power module; 101. Drive unit; 102. Reducer; 20. Main pump module; 30. Control valve group; 301. Booster pipeline; 31. Solenoid directional valve; 32. Proportional pressure regulating valve; 33. Pressure relief valve; 34. Proportional overflow valve; 40. Booster module; 50. Chassis; 60. Liquid supply and return system; 70. Monitoring and control system; 80. Safety and explosion-proof system. Detailed Implementation

[0038] 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.

[0039] To better understand the adaptive intelligent fluid supply device and control method for coal mine underground drilling and fracturing operations provided in the embodiments of the present invention, its application background is first introduced. In coal mine underground directional hydraulic fracturing and depressurization operations, directional long-distance drilling and hydraulic fracturing are two core processes, and two independent pumping systems are required to complete the corresponding operations respectively.

[0040] In practical applications, it has been found that due to the extremely limited downhole working space, the simultaneous deployment of two pumping systems brings many insurmountable drawbacks: 1) It occupies a large space; the total volume of the two sets of equipment exceeds 10m². 3 It occupies 1.5 to 2.0 meters of the roadway cross-section. 2 This encroaches on work and safe passage space.

[0041] 2) Difficulty in relocation and installation: Each process change requires separate handling, installation and connection of pipelines, resulting in complex construction organization and long time consumption.

[0042] 3) Low equipment utilization rate: Even when a set of equipment is idle, it still occupies space and incurs maintenance costs, with a resource utilization rate of less than 50%.

[0043] 4) The system is expensive, with high costs for purchasing, transporting and maintaining dual equipment, significantly increasing the total investment in downhole operations.

[0044] 5) The pipeline layout is complex, with different pressure levels and pipe diameters interspersed, resulting in complicated on-site connections and increasing the risk of leakage and misoperation.

[0045] In view of the above problems, embodiments of the present invention provide an adaptive intelligent fluid supply device and control method for underground drilling and fracturing operations in coal mines. It can output two working media with different pressures and flow rates on a single device, thereby integrating drilling fluid pumping and high-pressure fracturing into one unit. This effectively solves the problems of large space occupation, difficult relocation, high cost, and low efficiency caused by setting up dual-condition pump sets separately, and significantly improves the intensification, efficiency, and safety of pressure relief projects in underground coal mines.

[0046] The following is combined Figures 1-3 This invention describes an adaptive intelligent fluid supply device and control method for underground drilling and fracturing operations in coal mines.

[0047] Reference Figure 1 and Figure 2 An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines includes an integrated power module 10, a main pump module 20, a control valve group 30, and a pressurization module 40. The power module 10 provides driving force. The main pump module 20 is connected to the power module 10 and pressurizes the fluid to output a fluid with a first preset parameter. The control valve group 30 is connected to the outlet of the main pump module 20 and has two output ports that can be switched and adjusted. The pressurization module 40 is connected to one of the output ports of the control valve group 30 via a pressurization pipeline 301 and pressurizes the fluid output by the main pump module 20 to output a fluid with a second preset parameter.

[0048] In a specific application scenario, the power module 10 can provide driving force, and through the cooperation of the main pump module 20, the control valve group 30 and the booster module 40, it can output fluids with different pressure and flow parameters according to different working conditions, so as to meet the requirements of different working conditions for fluid pressure and flow.

[0049] In detail, during drilling operations, a low-pressure, high-flow-rate fluid is required. In this case, the fluid is drawn into the main pump module 20, pressurized to the first preset parameter, and then directly output to the borehole, meeting the low-pressure, high-flow-rate requirements of drilling. During fracturing operations, a high-pressure, low-flow-rate fluid is required. In this case, the control valve group 30 switches the output port. The fluid is initially pressurized by the main pump module 20, then output through the pressurization pipeline 301 to the pressurization module 40 for further pressurization to the second preset parameter, and then output to the borehole, meeting the high-pressure, low-flow-rate requirements of fracturing.

[0050] Compared to the simultaneous arrangement of two pumping systems in related technologies, this method can output two working media with different pressures and flow rates on a single device, thus integrating drilling fluid pumping and high-pressure fracturing into one unit. This effectively solves the problems of large space occupation, difficult relocation, high cost, and low efficiency caused by setting up separate dual-condition pump sets. It has the advantages of compact structure and integrated power supply, significantly saving downhole space, reducing equipment handling and installation, improving construction continuity and operational efficiency, and facilitating the intensive, efficient, and safe implementation of pressure relief projects in underground coal mines. It has good application value.

[0051] It is understood that the first and second preset parameters mentioned above can be adaptively designed according to different actual construction scenarios to meet the pressure and flow requirements of fluids under different construction scenarios. No specific limitations are made in this embodiment of the invention.

[0052] In one example of the present invention, the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines further includes a chassis 50, on which the power module 10, main pump module 20, and booster module 40 are all integrated. The chassis 50 is equipped with lifting points and a traveling mechanism at its bottom. This configuration allows the various modules to be integrated into a single unit via the chassis 50, while the lifting points on the chassis 50 and the traveling mechanism at its bottom facilitate the traction or lifting of the entire device.

[0053] In detail, the chassis 50 forms the bottom support of the entire device. It is configured as a frame structure welded from channel steel. The surface of the chassis 50 is coated with epoxy anti-corrosion paint to adapt to the humid and dusty environment underground. The chassis 50 has an external dimension of approximately 3.0m × 1.5m × 1.8m and a weight of approximately 3.8t.

[0054] The space on the chassis is divided into multiple functional areas, with different modules fixedly connected to different functional areas to reduce structural redundancy, shorten the power transmission path, and reduce system resistance loss. Lifting rings can be fixedly connected (e.g., welded or integrally set) to the chassis 50 to form lifting attachment points for connection with lifting equipment. The traveling components at the bottom of the chassis 50 can be set as slide rails, allowing the chassis 50 to be placed on a flat foundation via the slide rails for easy traction of the entire device.

[0055] The following section will describe in detail the various modules integrated on the chassis 50, with reference to the accompanying drawings.

[0056] In one example of this invention, refer to Figure 1 The power module 10 includes a drive unit 101 and a reducer 102. The drive unit 101 provides rotational driving force, and its output shaft is connected to the input shaft of the reducer 102. The output shaft of the reducer 102 is connected to the main pump module 20 via a coupling. This configuration allows the reducer 102 to increase the output torque while ensuring the stability and accuracy of power transmission, enabling the main pump module 20 to obtain power parameters suitable for operational needs and meet the power output requirements under drilling or fracturing conditions.

[0057] Furthermore, the drive unit 101 can be a drive motor or diesel engine with a rated power of 400kW and a speed of 1480r / min. Moreover, the speed of the drive unit 101 can be adjusted according to different working conditions. For example, variable frequency drive technology can be used to dynamically adjust the motor speed according to the different power curves required in the drilling and fracturing stages, so as to achieve adaptive adjustment of low speed and high flow rate and high speed and high pressure output.

[0058] Furthermore, to meet the explosion-proof requirements in mines, the drive motor can be configured as an explosion-proof motor, and the diesel engine can be configured as an explosion-proof diesel engine. The reducer is set as a two-stage gear reducer 102, with an output speed of 200-500 r / min, to provide stable drive for the main pump module 20.

[0059] It should be clarified that the above description is only an example, and the drive unit 101 and the reducer include, but are not limited to, the specifications or structural forms described above. In this embodiment of the invention, they will not be listed one by one.

[0060] In one example of this invention, the main pump module 20 is configured as a three-cylinder reciprocating piston pump with a rated displacement of 400 L / min and a rated pressure of 12 MPa. It is mainly responsible for grout supply during the drilling stage, achieving low-pressure, high-flow delivery. The inlet and outlet of the main pump module 20 are connected to check valves and vibration damping joints to prevent fluid pulsation and backflow.

[0061] It should be noted that the three-cylinder reciprocating piston pump is a mature existing product, and its working principle and specific structure can be referred to existing technology, so they will not be described in detail in this embodiment of the invention. Furthermore, the main pump module 20 is not limited to the specifications mentioned above; it can be configured with other specifications depending on different construction scenarios, which will not be listed in this embodiment of the invention.

[0062] The control valve assembly 30 is connected to the outlet of the main pump module 20. By adjusting the flow direction of the fluid, the switching between "drilling" and "fracturing" modes is realized. In one example of the present invention, the control valve assembly 30 includes an electromagnetic directional valve 31. The electromagnetic directional valve 31 has one inlet and two outlets. The inlet of the electromagnetic directional valve 31 is connected to the outlet of the main pump module 20. One outlet is used to connect to the drilling fluid supply pipe through the drain pipe, and the other outlet is connected to the booster module 40 through the booster pipe 301.

[0063] With this configuration, the electromagnetic reversing valve 31 can adjust the fluid flow direction by receiving control commands. In drilling mode, the fluid pressurized by the main pump module 20 is directly discharged to the drilling supply pipe through the drain pipe. In fracturing mode, the two input ports can be switched through the battery reversing valve. The fluid pressurized by the main pump module 20 enters the pressurization module 40 for further pressurization and is then discharged to the borehole to meet the fracturing requirements.

[0064] To facilitate pressure regulation, in a further example of the present invention, the control valve assembly 30 further includes a proportional pressure regulating valve 32 and a pressure relief valve 33; wherein, the proportional pressure regulating valve 32 is connected to the booster pipeline 301 and is used to regulate the pressure of the fluid input to the booster module 40; the pressure relief valve 33 is connected to the booster pipeline 301 and is located between the proportional pressure regulating valve 32 and the booster module 40, and is used to overflow and relieve pressure when the fluid pressure exceeds a set value.

[0065] With this configuration, the proportional pressure regulating valve 32 can receive control commands and linearly adjust the valve opening, thereby precisely controlling the fluid pressure input to the booster module 40 and adjusting the fluid pressure output by the booster module 40. Meanwhile, the pressure relief valve 33 can release pressure when the fluid pressure exceeds the set value, ensuring safety.

[0066] Furthermore, in drilling mode, the booster module 40 is in bypass mode, maintaining an output pressure of 5–12 MPa and a flow rate of 400 L / min, primarily used to carry drill cuttings, cool the drill bit, and maintain stability within the borehole. In fracturing mode, fluid flows into the booster module 40, which increases the pressure to 30–80 MPa.

[0067] In a further example of the present invention, a proportional relief valve 34 can be connected in parallel at the output port of the main pump module 20. Through the over-limit pressure relief function of the proportional relief valve 34, the output pressure of the main pump module 20 can be maintained within the set pressure range to ensure safety.

[0068] In a further example of the present invention, the control valve assembly 30 further includes a one-way valve; the one-way valve is connected to the booster line 301, and the fluid flows unidirectionally from the main pump module 20 to the booster module 40.

[0069] In one example of the present invention, the booster module 40 serves as a structure for secondary pressurization of the fluid. It includes a hydraulic booster cylinder and a high-pressure plunger pump, which is connected to the main pump outlet during fracturing operations to increase the pressure to 30-80 MPa and the flow rate to approximately 100 L / min.

[0070] It should be noted that the hydraulic booster cylinder and high-pressure plunger pump are existing mature products, and their working principles and specific structures can be referred to existing technologies, which will not be elaborated here in this embodiment of the invention. Furthermore, the booster module 40 is not limited to the above-mentioned structure and specifications. Depending on different construction scenarios, booster modules 40 with other specifications can also be configured, which will not be listed in this embodiment of the invention.

[0071] In a further example of the present invention, the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines also includes a fluid supply and return system 60; the fluid supply and return system 60 includes a storage tank, a suction pipe, a discharge pipe, and a return channel; wherein, the storage tank is used to store fluid; the suction pipe is used to connect the storage tank and the main pump module 20; the output port of the booster module 40 and the other output port of the control valve group 30 relative to the booster module 40 are connected to the borehole through the discharge pipe; the return channel is used to return the fluid discharged from the borehole to the storage tank.

[0072] With this configuration, during drilling and fracturing, the main pump module 20 draws fluid from the storage tank through the suction line. The fluid then enters the main pump module 20 for pressurization. In drilling mode, the pressurized fluid from the main pump module 20 is directly introduced into the borehole through the discharge line. In fracturing mode, the pressurized fluid from the main pump module 20 enters the pressurization module 40 through the pressurization line 301, and is then pressurized again before being introduced into the borehole. The fluid discharged from drilling and fracturing flows back into the storage tank for reuse, ensuring smooth fluid circulation and safe operation.

[0073] Furthermore, the liquid supply and return system 60 also includes a filter device, which is installed in the liquid storage tank to filter the fluid entering the suction pipe. This prevents impurities from entering the subsequent pump module and ensures the stability and reliability of the device operation.

[0074] In detail, the filtration device can be configured as a three-stage filter to improve the filtration effect on the fluid.

[0075] Furthermore, in the entire fluid supply and return system 60, the pipelines can use quick-connect high-pressure connectors, which are simple to arrange and facilitate quick downhole connection.

[0076] To facilitate system control, in one example of the present invention, the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines further includes a monitoring and control system 70; the monitoring and control system 70 includes a data acquisition module and a controller; wherein, the data acquisition module is used to acquire parameters of the fluid output by the main pump module 20 and the booster module 40; the controller is communicatively connected to the data acquisition module, the power module 10, the main pump module 20, the control valve group 30 and the booster module 40, and is used to adjust the output fluid to preset parameters according to different working conditions.

[0077] With this setup, through feedback closed-loop control between the controller and the data acquisition module, the output parameters can be automatically matched. Based on a preset threshold, for example, when the set pressure is the pressure required for fracturing, the control valve group 30 is controlled by the controller to automatically switch to the booster module 40, thereby dynamically adjusting the flow rate and pressure under different operating conditions and achieving rapid and seamless process conversion.

[0078] In detail, the controller can be an existing PLC (Programmable Logic Controller). The controller can preset or receive externally input parameter thresholds and dynamically adjust the equipment operating parameters through control algorithms such as PID (Proportional-Integral-Derivative) to ensure dynamic adjustment of fluid flow and pressure under different operating conditions.

[0079] In detail, the data acquisition module includes a pressure sensor and a flow sensor; wherein, the pressure sensor and the flow sensor are connected to the output ports of the main pump module 20 and the booster module 40, and are used to collect the flow rate and pressure of the fluid output by the main pump module 20 and the flow rate and pressure of the fluid output by the booster module 40, respectively.

[0080] In one example of the present invention, the monitoring and control system 70 further includes a human-machine interaction module, which is signal-connected to the controller, and the human-machine interaction module is provided with control keys for inputting control commands.

[0081] With this setup, control commands can be entered through the human-computer interaction module to facilitate manual adjustment of the working mode and parameters.

[0082] To elaborate further, the controller is equipped with a recording unit, and the human-machine interaction module includes a display unit. After the controller collects data from various points through the data acquisition module, it automatically performs logical judgments and control outputs, and displays the pressure-time curve, flow-time curve, and equipment operating status in real time through the display unit.

[0083] In detail, the human-computer interaction module can be configured as an HMI touchscreen.

[0084] In one example of the present invention, the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines further includes a safety explosion-proof system 80; the safety explosion-proof system 80 includes a hazard information acquisition module and the aforementioned controller; wherein, the hazard information acquisition module is used to acquire hazard signals; the controller is signal-connected to the hazard information acquisition module and is used to determine that when the hazard signal exceeds a set value, to execute explosion-proof measures to ensure operational safety.

[0085] In detail, the hazard information acquisition module includes a methane detection device, a pressure sensor, a temperature sensor, a flow sensor, and a vibration sensor; explosion-proof measures include alarms, power cut-off, and pressure relief.

[0086] In addition, explosion-proof designs can be implemented for each electrical component to improve the overall explosion-proof performance of the equipment.

[0087] It is understood that, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0088] The adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines provided by this invention is described below.

[0089] Reference Figure 3 An adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines, applicable to the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines provided in any of the above examples, the method comprising the following steps: Step S1: In drilling mode, the fluid is pressurized to the first preset parameter by the main pump module 20 and then directly output to the borehole.

[0090] Step S2: In fracturing mode, the fluid is pressurized by the main pump module 20 and then output through the pressurization pipeline 301 to the pressurization module 40 for further pressurization to the second preset parameter, and then output to the borehole.

[0091] In one example of the present invention, in the drilling mode, the booster module 40 is in bypass mode, and the output pressure is maintained at 5-12 MPa and the flow rate is 400 L / min.

[0092] In one example of the present invention, under the fracturing mode, pressure and flow curves are collected in real time, and the injection volume and time of the fracturing section are recorded. If an abnormal increase in pressure or a sudden drop in flow is detected, pressure relief and shutdown measures are implemented.

[0093] The adaptive intelligent fluid supply device and control method for underground drilling and fracturing operations in coal mines provided by this invention can output two working media with different pressures and flow rates on a single device, thereby integrating drilling fluid pumping and high-pressure fracturing into one unit. This effectively solves the problems of large space occupation, difficult relocation, high cost, and low efficiency caused by setting up separate dual-condition pump sets. It has the advantages of compact structure and integrated energy supply, significantly saves underground space, reduces equipment handling and installation, improves construction continuity and operation efficiency, and is conducive to realizing the intensive, efficient, and safe depressurization project in underground coal mine areas. It has good promotion and application value.

[0094] 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. An adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines, characterized in that, Including integrated: Power module (10) for providing driving force; The main pump module (20) is connected to the power module (10) and is used to pressurize the fluid and output the fluid with the first preset parameters; A control valve assembly (30) is connected to the outlet of the main pump module (20); the control valve assembly (30) has two output ports that can be switched and adjusted in opening. The booster module (40) is connected to one of the output ports of the control valve group (30) through the booster pipeline (301) to boost the fluid output by the main pump module (20) and output the fluid with the second preset parameters.

2. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 1, characterized in that, The control valve assembly (30) includes: The electromagnetic reversing valve (31) has one input port and two output ports. The input port of the electromagnetic reversing valve (31) is connected to the outlet of the main pump module (20). One of the output ports is used to connect to the drilling supply pipe through the drain pipe, and the other output port is connected to the booster module (40) through the booster pipeline (301).

3. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 2, characterized in that, The control valve assembly (30) also includes: A proportional pressure regulating valve (32) is connected to the booster pipeline (301) and is used to regulate the pressure of the fluid input to the booster module (40); A pressure relief valve (33) is connected to the pressurization line (301) and is used to overflow and relieve pressure when the pressure of the fluid exceeds a set value.

4. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 3, characterized in that, The control valve assembly (30) also includes: A one-way valve, connected to the booster line (301), is used for the unidirectional flow of the fluid from the main pump module (20) to the booster module (40).

5. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 1, characterized in that, It also includes a liquid supply and return system (60), which includes: Liquid storage tanks are used to store fluids; A suction line is used to connect the liquid storage tank and the main pump module (20); The drain pipe connects the output port of the booster module (40) and the other output port of the main pump module (20) relative to the booster module (40) to the borehole. The return channel is used to return the liquid discharged from the borehole to the storage tank.

6. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 5, characterized in that, The liquid supply and return system (60) also includes: A filtration device is installed inside the liquid storage tank to filter the fluid entering the suction pipe.

7. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 1, characterized in that, It also includes a monitoring and control system (70), which includes: The data acquisition module is used to acquire parameters of the fluid output by the main pump module (20) and the booster module (40); The controller is communicatively connected to the data acquisition module, the power module (10), and the control valve group (30), and is used to adjust the fluid to preset parameters according to different working conditions; And / or, it also includes a safety explosion-proof system (80), said safety explosion-proof system (80) comprising: Hazard information acquisition module, used to collect hazard signals; The controller is connected to the hazard information acquisition module and is used to execute explosion-proof measures when the hazard signal exceeds a set value. And / or, also includes: The chassis (50) integrates the power module (10), the main pump module (20) and the booster module (40); the chassis (50) is provided with a hoisting point and a walking component at the bottom.

8. The adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines according to claim 1, characterized in that, The main pump module (20) is configured as a three-cylinder reciprocating piston pump with a rated pressure of 12MPa and a rated flow of 400L / min. And / or, The power module (10) includes: A drive unit (101) is used to provide rotational driving force; The drive unit (101) is connected to the main pump module (20) via the speed reducer (102); And / or, The booster module (40) includes a hydraulic booster cylinder and a high-pressure plunger pump.

9. An adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines, applicable to the adaptive intelligent fluid supply device for underground drilling and fracturing operations in coal mines as described in any one of claims 1 to 8, comprising the following steps: In drilling mode, the fluid is pressurized to the first preset parameter by the main pump module (20) and then directly output to the borehole; In fracturing mode, the fluid is pressurized by the main pump module (20) and then output from the pressurization pipeline (301) to the pressurization module (40) for further pressurization to the second preset parameter, and then output to the borehole.

10. The adaptive intelligent fluid supply control method for underground drilling and fracturing operations in coal mines according to claim 9, characterized in that, In the drilling mode, the booster module (40) is in bypass mode, with the output pressure maintained at 5-12 MPa and the flow rate at 400 L / min; and / or, In the fracturing mode, pressure and flow curves are collected in real time, and the injection volume and time of the fracturing section are recorded. If an abnormal increase in pressure or a sudden drop in flow is detected, pressure relief and shutdown measures are implemented.

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