Hydraulic fracturing equipment with transverse grooving function

Abstract

The hydraulic fracturing equipment comprises a mounting frame, an oil pump box is mounted on one side of the mounting frame, the surface of the oil pump box is connected with an oil pipe, an energy storage device is mounted on the surface of the oil pipe, one end of the oil pipe is connected with a connecting pipe, one end of the connecting pipe is connected with a water injection pipe, and the other end of the connecting pipe is connected with a water pump. A pressure regulating valve is installed between the oil pipe and the connecting pipe, a flow meter used for detecting flow is installed on one side of the pressure regulating valve, and a collecting instrument used for recording flow and pressure changing curves in real time is installed on the outer side of the pressure regulating valve. The oil pump box, the energy storage device and the water injection pipe are used in a matched mode, oil and water are separated through the piston in the energy storage device, pump pressure can be transmitted, water pressure can be increased, and therefore the fracturing section is pressurized, high-pressure water injection fracturing is achieved, and the hydraulic fracturing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mine working face mining technology, specifically a hydraulic fracturing device for transverse grooving. Background Technology

[0002] High-pressure water fracturing technology uses a high-pressure water pump to inject high-pressure water into the coal and rock strata through boreholes. The high-pressure water impacts the borehole walls, disrupting the coal and rock structure and causing cracks to form within the coal and rock strata, or opening previously closed cracks to create new ones. This technology addresses problems encountered in coal mining, such as the weakening of top coal in fully mechanized longwall mining of hard, thick (high-gas) coal seams, large-area pressure from hard roofs, impact stress, gas outbursts, pressure relief from residual coal pillars, and efficient gas extraction in coal seams. The principle of underground high-pressure water fracturing in coal mines is to inject high-pressure water into the coal and rock mass through boreholes at a rate exceeding the coal and rock strata filtration rate. Overcoming minimum ground stress and the tensile strength of coal and rock mass, the splitting or supporting action on the two walls of various primary weak surfaces in coal and rock strata causes the weak surfaces to open, expand, and extend, thus forming internal divisions of the coal seam. This division process, on the one hand, increases the spatial volume of weak surfaces such as fractures through the opening and expansion of primary weak surfaces, thereby increasing the porosity of the coal body; on the other hand, the extension of primary weak surfaces such as pores and fractures increases the connectivity between pores and fractures, forming an interwoven multi-fracture network. The generated or increased fractures can effectively shorten the fracture distance of coal and rock strata, thereby achieving the goal of shortening the initial mining and initial release pressure step distance of the working face.

[0003] In the operation of existing hydraulic fracturing equipment, pre-fabricated fractures are created in the borehole fracturing section, and the hydraulic fracturing crack propagation direction is relatively singular, which is not conducive to achieving transverse cutting. As a result, the hydraulic fracturing crack propagation direction can only be along the vertical direction.

[0004] Therefore, those skilled in the art have provided a hydraulic fracturing device with transverse slotting to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to provide a hydraulic fracturing device with transverse grooving to solve the problem mentioned in the background art that existing hydraulic fracturing devices are not conducive to achieving transverse grooving during use.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hydraulic fracturing device with transverse grooving includes: a mounting frame; an oil pump box mounted on one side of the mounting frame, with an oil pipe connected to the surface of the oil pump box; an energy storage device mounted on the surface of the oil pipe; a connecting pipe connected to one end of the oil pipe, and a water injection pipe connected to one end of the connecting pipe; a pressure regulating valve installed between the oil pipe and the connecting pipe; a flow meter for detecting flow rate mounted on one side of the pressure regulating valve; a data acquisition instrument for real-time recording of flow rate and pressure change curves mounted on the outside of the pressure regulating valve; an installation plate mounted on the end of the water injection pipe away from the connecting pipe, with an extension pipe fixedly connected to the surface of the installation plate; a connecting pipe joint fixedly mounted on one end of the extension pipe; a nozzle tube connected to one end of the extension pipe; and a water outlet pipe threadedly connected to one end of the nozzle tube; a first water outlet provided at the water outlet end; and a transverse grooving fixedly opened on the surface of the water outlet pipe, with a second water outlet installed inside the transverse grooving.

[0008] As a further improvement of this utility model: a connecting pipe is installed inside the water outlet pipe, and a water distribution plate is installed inside the connecting pipe.

[0009] As a further improvement of this utility model: the external shape of the connecting pipe is a cross shape, and the external shape of the water distribution plate inside the connecting pipe is a cone shape.

[0010] As a further embodiment of this utility model: a rotating rod is movably connected to the surface of the connecting pipe section, and a screw is connected to the upper end of the rotating rod, with a nut threaded onto the surface of the screw.

[0011] As a further improvement of this utility model: a docking seat is installed at one end of the gun head tube near the connecting pipe section, and the gun head tube and the extension tube are connected by threads.

[0012] As a further improvement of this utility model: the surface of the docking seat is provided with an opening groove that is narrow on the outside and wide on the inside, and the dimensions of the opening groove on the surface of the docking seat and the screw are matched.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The oil pump box and accumulator are used in conjunction with the water injection pipe. The piston inside the accumulator separates the oil and water, and can also transmit pump pressure and increase water pressure, thereby pressurizing the fracturing section, realizing high-pressure water injection fracturing, and improving the effect of hydraulic fracturing.

[0015] 2. A water outlet pipe is installed at the water outlet end of the nozzle tube. A transverse cut is made on the surface of the water outlet pipe. A second water outlet is set inside the transverse cut, which works in conjunction with the first water outlet. The first water outlet performs straight water injection and cutting, while the second water outlet can perform transverse cutting. A cross-shaped connecting pipe is set inside the water outlet pipe. A water distribution plate is installed inside the connecting pipe. The connecting pipe is used to divert water, thereby working with the second water outlet to perform transverse cutting and realize the transverse extension direction of the hydraulic fracturing crack. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a hydraulic fracturing device with transverse grooving.

[0017] Figure 2 This is a schematic diagram of the connection structure between the extension pipe and the nozzle pipe of a hydraulic fracturing device with a transverse groove.

[0018] Figure 3 This is a schematic diagram of the outlet pipe in a hydraulic fracturing device with a transverse groove.

[0019] Figure 4 This is a schematic diagram of the connecting pipe in a hydraulic fracturing device with a transverse groove.

[0020] Figure 5 This is a cross-sectional schematic diagram of the connecting pipe in a hydraulic fracturing device with a transverse groove.

[0021] In the diagram: 1. Mounting bracket; 2. Oil pump box; 3. Oil pipe; 4. Flow meter; 5. Connecting pipe; 6. Pressure regulating valve; 7. Data acquisition instrument; 8. Water injection pipe; 9. Mounting plate; 10. Extension pipe; 11. Connecting pipe joint; 12. Rotating rod; 13. Screw; 14. Nut; 15. Gun head tube; 16. Connecting seat; 17. Water outlet pipe; 18. First water outlet; 19. Transverse cut; 20. Second water outlet; 21. Connecting pipe; 22. Water distribution plate; 23. Energy storage device. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-5This utility model provides a hydraulic fracturing device with transverse grooving, comprising: a mounting frame 1, an oil pump box 2 mounted on one side of the mounting frame 1, an oil pipe 3 connected to the surface of the oil pump box 2, an energy storage device 23 mounted on the surface of the oil pipe 3, a connecting pipe 5 connected to one end of the oil pipe 3, and a water injection pipe 8 connected to one end of the connecting pipe 5, a pressure regulating valve 6 installed between the oil pipe 3 and the connecting pipe 5, a flow meter 4 for detecting flow rate mounted on one side of the pressure regulating valve 6, an acquisition instrument 7 for real-time recording of flow rate and pressure change curves mounted on the outside of the pressure regulating valve 6, and a mounting plate 9 mounted on the end of the water injection pipe 8 away from the connecting pipe 5, with a fixed connection on the surface of the mounting plate 9. An extension tube 10 is provided, with a connecting pipe section 11 fixedly installed at one end. A nozzle tube 15 is connected to one end of the extension tube 10, and a water outlet tube 17 is threadedly connected to one end of the nozzle tube 15. A rotating rod 12 is movably connected to the surface of the connecting pipe section 11, and a screw 13 is connected to the upper end of the rotating rod 12. A nut 14 is threaded onto the surface of the screw 13. A docking seat 16 is installed at the end of the nozzle tube 15 near the connecting pipe section 11. The nozzle tube 15 and the extension tube 10 are threaded together. The surface of the docking seat 16 has an opening groove that is narrow on the outside and wide on the inside, and the opening groove on the surface of the docking seat 16 is dimensionally matched with the screw 13.

[0024] Specifically, one end of the nozzle tube 15 is protruding, while one end of the extension tube 10 is recessed, allowing the nozzle tube 15 and the extension tube 10 to be installed together. Using the screw 13 on the connecting tube section 11, the screw 13 is inserted into the opening groove on the surface of the connecting seat 16. Through the mutual cooperation between the screw 13 and the nut 14, the tightness of the connection between the nozzle tube 15 and the extension tube 10 is strengthened.

[0025] The outlet end of the water pipe 17 is provided with a first outlet 18, and a transverse cut 19 is fixedly opened on the surface of the water pipe 17, and a second outlet 20 is installed inside the transverse cut 19.

[0026] The outlet pipe 17 has a connecting pipe 21 installed inside, and the connecting pipe 21 has a water distribution plate 22 installed inside. The external shape of the connecting pipe 21 is a cross shape, and the external shape of the water distribution plate 22 inside the connecting pipe 21 is a cone shape.

[0027] Specifically, the water outlet pipe 17 is internally connected to the nozzle pipe 15, and the connecting pipe 21 is connected to the horizontally arranged second water outlet 20, which is conducive to achieving horizontal cutting with the second water outlet 20, thereby generating horizontal pressure cracks. The conical water distribution plate 22 can divert water, and water can pass through the center of the water distribution plate 22. At the same time, the water distribution plate 22 blocks the water to flow towards the second water outlet 20.

[0028] The working principle of this utility model is as follows:

[0029] When using this utility model, the nozzle tube 15 and the extension tube 10 are connected and installed. The protruding surface at the end of the nozzle tube 15 is configured with a threaded structure, and the concave inner wall at the end of the extension tube 10 is configured with a thread that mates with the protruding part at the end of the nozzle tube 15. This allows the nozzle tube 15 and the extension tube 10 to be connected by a thread, resulting in better connectivity. Rotating the rotating rod 12 on the connecting pipe section 11 causes the screw 13 on the rotating rod 12 to engage with the opening groove on the connecting seat 16. The mutual cooperation between the screw 13 and the nut 14 further strengthens the connection between the nozzle tube 15 and the extension tube 10. Furthermore, the cooperation between the oil pump box 2 and the accumulator 23 increases the pump pressure and achieves oil-water separation. Water pipe 8 injects water into the mining face through extension pipe 10 and nozzle pipe 15. To monitor the testing process in real time, display, record and analyze the test results, a water pressure fracturing data acquisition instrument 7 and a flow meter 4 are used to record the flow rate and pressure change curves in real time. The collected results are transmitted to a computer for processing and calculation to obtain the ground stress value. Next, water enters the outlet pipe 17 and is diverted using a cross-shaped connecting pipe 21 and a water distribution plate 22 inside the connecting pipe 21. When the second outlet 20 works in conjunction with the first outlet 18 to inject water and cut the crack, new cracks are generated at the same time as the cracks expand. The flow meter 4 is used to monitor the flow rate and the amount of water injected to ensure that the roof rock layer is sufficiently weakened and softened.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A transversely slotted hydraulic fracturing apparatus, characterized by, Include: Mounting frame (1), one side of mounting frame (1) is installed oil pump tank (2), and the surface of oil pump tank (2) is connected with oil pipe (3), the surface of oil pipe (3) is installed energy storage device (23), one end of oil pipe (3) is connected with connecting pipe (5), and one end of connecting pipe (5) is connected with water injection pipe (8), pressure regulating valve (6) is installed between oil pipe (3) and connecting pipe (5), and flow meter (4) for detecting flow is installed on one side of pressure regulating valve (6), acquisition instrument (7) for recording flow and pressure change curve in real time is installed on the outer side of pressure regulating valve (6), installation disc (9) is installed on the end of water injection pipe (8) away from connecting pipe (5), and extension pipe (10) is fixedly connected on the surface of installation disc (9), butt joint pipe section (11) is fixedly installed on one end of extension pipe (10), gun head pipe (15) is butt jointly installed on one end of extension pipe (10), and water outlet pipe (17) is threadedly connected on one end of gun head pipe (15), first water outlet (18) is arranged on the water outlet end of water outlet pipe (17), and transverse notch (19) is fixedly arranged on the surface of water outlet pipe (17), second water outlet (20) is installed in transverse notch (19).

2. A lateral slotting hydraulic fracturing apparatus according to claim 1, wherein, The inside of the water outlet pipe (17) is provided with a communication pipe (21), and the inside of the communication pipe (21) is provided with a water distribution disc (22).

3. A lateral slotting hydraulic fracturing apparatus according to claim 2, wherein, The outer shape of the communication pipe (21) is a "cross" structure, and the outer shape of the water distribution disc (22) inside the communication pipe (21) is a conical structure.

4. A lateral slotting hydraulic fracturing apparatus according to claim 1, wherein, The surface of the butt joint pipe section (11) is movably connected with a rotating rod (12), and the upper end of the rotating rod (12) is connected with a screw rod (13), and the surface of the screw rod (13) is threadedly sleeved with a nut (14).

5. A transversely slotted hydraulic fracturing apparatus as defined in claim 1, wherein, The end of the gun head pipe (15) close to the butt joint pipe section (11) is provided with a butt joint seat (16), and the gun head pipe (15) and the extension pipe (10) are threadedly connected.

6. A lateral slotting hydraulic fracturing apparatus according to claim 5, wherein, The surface of the butt joint seat (16) is provided with an opening slot with narrow outside and wide inside, and the size of the opening slot on the surface of the butt joint seat (16) and the screw rod (13) is matched with each other.

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