Coal seam high-frequency vibration auxiliary hydraulic fracturing permeation increasing device

Abstract

The utility model provides a coal seam high-frequency vibration auxiliary hydraulic fracturing permeation increasing device which comprises a hollow drill rod with a hydraulic drill bit at the front end, a plugging device used for plugging a hole opening of a drill hole is arranged on the drill rod, and high-pressure water provided by a water supply device can enter the drill rod; the drill rod is connected with the drilling machine, and under the action of the drilling machine and the hydraulic drill bit, the drill rod can drill holes in a target coal seam or rock stratum; a plurality of hydraulic nozzles are installed on the drill rod, and a hydraulic vibration device driven by hydraulic power is installed in the drill rod. According to the utility model, the three functions of directional drilling of the drill rod, reconstruction of coal body macroscopic fractures by hydraulic fracturing and reconstruction of a coal body micro-fracture net structure by high-frequency vibration waves are integrated, hydraulic fracturing cave making and high-frequency vibration permeability increasing are accurately carried out while drilling is carried out, and full-scale hole and fracture structures of media can be efficiently improved; the desorption-diffusion-seepage of the gas in the coal body is improved to a greater extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal seam permeability enhancement, and in particular relates to a coal seam high-frequency vibration assisted hydraulic fracturing permeability enhancement device. Background Art

[0002] Most of my country's coal seams have high gas pressure, high ground stress and low permeability. The gas dynamic phenomenon is serious during coal mining, the geological conditions are complex, and the coal seams have poor permeability, resulting in low extraction utilization rates of most coal seams, necessitating fracturing to increase permeability.

[0003] Conventional hydraulic fracturing technology, such as the permeability enhancement and pressure relief device disclosed in CN202211184025.2 and the hydraulic fracturing permeability enhancement device disclosed in CN201711125065.9, requires first drilling a fracture hole with a drill pipe, and then injecting high-pressure water into the fracture hole for hydraulic fracturing. The efficiency is low, and the initiation position of coal cracks cannot be controlled. The crack extension range is small, which can easily cause water lock and block the gas circulation channel. Utility Model Content

[0004] The utility model aims to solve the technical problems existing in the prior art and aims to provide a coal seam high-frequency vibration assisted hydraulic fracturing permeability enhancement device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-frequency vibration-assisted hydraulic fracturing and permeability enhancement device for coal seams, comprising a hollow drill rod with a drill bit at the front end, a plugger for sealing the borehole opening is provided on the drill rod, the drill bit is a hydraulic drill bit driven by water power, the water inlet of the drill rod is connected to a water supply device, the interior of the drill rod is a water flow channel, and high-pressure water provided by the water supply device can enter the drill rod; the drill rod is connected to a drilling rig, and under the action of the drilling rig and the hydraulic drill bit, the drill rod can drill holes in the target coal seam or rock formation; a plurality of hydraulic nozzles located at the rear side of the hydraulic drill bit are installed on the side wall of the drill rod, and a hydraulic vibration device driven by water power is installed in the drill rod.

[0006] The above technical solution, by setting a hydraulic drill bit, a hydraulic nozzle and a hydraulic vibration device, performs hydraulic fracturing and cavitation and high-frequency vibration permeability enhancement while drilling, which is highly efficient, and the crack initiation position of the coal body crack can be controlled by controlling the position where the drill rod is sent in. The utility model integrates three functions of drill rod directional drilling, hydraulic fracturing to transform the macroscopic cracks of the coal body, and high-frequency vibration wave to transform the micro-fracture network structure of the coal body. It can accurately perform hydraulic fracturing and cavitation and high-frequency vibration permeability enhancement while drilling, which can effectively improve the full-scale pore and fracture structure of the media, and is conducive to opening up the diffusion and seepage channels of gas in the coal body, and maximizing the desorption-diffusion-seepage of gas in the coal body.

[0007] In a preferred embodiment of the present invention, the occluder is a water bag made of elastic material and surrounding the drill rod, and the occluder is expanded by injecting water into the water bag to seal the drill rod.

[0008] In the above technical solution, the occluder is a water bag, which is sealed by water injection, and is highly reliable, fast and efficient.

[0009] In a preferred embodiment of the utility model, the plugger can slide on the drill rod, and the plugger has a water injection port.

[0010] In the above technical solution, the position of the plugger is fixed and does not move with the drill rod to plug the borehole opening.

[0011] In a preferred embodiment of the present invention, the opening of the drilled hole is also fixedly connected to a support seat located at the rear side of the occluder to support it.

[0012] In the above technical solution, the support seat is used to support and fix the position of the occluder to ensure that the occluder does not move with the drill rod.

[0013] In a preferred embodiment of the present invention, the plugger is fixedly connected to the support seat, and the water injection port of the plugger passes through the support seat and extends to the outside of the drilled hole.

[0014] In the above technical solution, the water injection port extends through the support seat to the outside of the drill hole, which is convenient for water injection and water discharge of the plugger and more convenient for operation.

[0015] In a preferred embodiment of the utility model, a turbine located between the hydraulic nozzle and the hydraulic vibration device is installed in the drill rod, and a static valve disc and a dynamic valve disc are also sequentially provided between the hydraulic drill bit and the hydraulic nozzle in the drill rod.

[0016] In the above technical solution, high-pressure water enters the drill pipe, is pressurized by a turbine, and then forms a water pressure pulse through the static valve disc and the dynamic valve disc at the rear side of the hydraulic drill bit, which acts on the hydraulic vibration device to generate high-frequency vibration.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of the coal seam high-frequency vibration assisted hydraulic fracturing permeability enhancement device of Example 1.

[0020] Figure 2 It is a structural schematic diagram of using the permeability enhancing device of the embodiment to enhance the permeability of the coal seam.

[0021] The figure marks in the drawings of the specification include: drill rod 1, water supply device 2, hydraulic drill bit 3, hydraulic nozzle 4, hydraulic vibration device 5, plug 6, water injection port 7, support seat 8, turbine 9, static valve disc 10, dynamic valve disc 11, borehole 12, coal seam 13, rock tunnel 14. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] Embodiment 1

[0026] This embodiment provides a coal seam high-frequency vibration assisted hydraulic fracturing permeability enhancement device, such as Figure 1 and Figure 2 As shown, in a preferred embodiment, the permeability enhancement device includes a drill rod 1 with a hollow front end provided with a drill bit, and a plugger 6 for plugging the borehole 12 is provided on the drill rod 1; the drill bit is a hydraulic drill bit 3 driven by water power, and the water inlet at the rear end of the drill rod 1 is connected to a water supply device 2, and the water supply device 2 can adopt a high-pressure water pump. The interior of the drill rod 1 is a water flow channel, and the high-pressure water provided by the water supply device 2 can enter the drill rod 1. The drill rod 1 is connected to the drilling rig, and under the high-speed rotation of the hydraulic drill bit 3 and the pushing action of the drilling rig, the drill rod 1 can drill into the target coal seam 13 or rock formation to construct the borehole 12. A plug 6 is installed on the side wall of the drill rod 1 at the rear side of the hydraulic drill bit 3 ( Figure 2A plurality of hydraulic nozzles 4 are provided on the lower side (shown in the figure), and a hydraulic vibration device 5 driven by water force is installed in the drill pipe 1.

[0027] Under the hydraulic action of high-pressure water, the hydraulic drill bit 3 rotates at high speed to drill holes, and the drill rig pushes the drill rod 1 to drill, forming a borehole 12, and the orifice of the borehole 12 is blocked by the plug 6 to achieve high-pressure water blocking. After the drill rod 1 is sent to the designated position, the hydraulic nozzle 4 sprays high-pressure water to act on the coal seam 13, and hydraulic fracturing generates a large number of macroscopic fracture structures, opens up the gas seepage channel in the coal body, and then the hydraulic vibration device 5 is driven by water to implement high-frequency vibration of the coal body to assist in generating a large number of micro-fracture network structures, improving the gas diffusion channel in the coal body. After hydraulic fracturing and high-frequency vibration are performed to enhance the permeability of the coal seam 13 at a designated position, when the drill rod 1 and the hydraulic drill bit 3 continue to drill to the next designated position, hydraulic fracturing and high-frequency vibration enhancement are performed.

[0028] In the utility model, a turbine 9 located between the hydraulic nozzle 4 and the hydraulic vibration device 5 is installed in the drill pipe 1, and preferably multiple turbines 9 are arranged side by side to form a turbine group; a static valve disc 10 and a dynamic valve disc 11 are also arranged in sequence between the hydraulic drill bit 3 and the hydraulic nozzle in the drill pipe 1, and the static valve disc 10 is a fixed valve, and the dynamic valve disc 11 is a dynamic valve. High-pressure water enters the drill pipe 1, is pressurized by the turbine 9, and then the high-pressure water is sprayed out through the hydraulic nozzle 4 for hydraulic fracturing; and when the high-pressure water passes through the static valve disc 10 and the dynamic valve disc 11, a water pressure pulse is formed, which acts on the hydraulic vibration device 5 to generate high-frequency vibration, and hydraulic fracturing and high-frequency vibration are performed at the same time. The hydraulic vibration device 5 has a vibration disc, a vibration rod or a vibrator inside, which can generate vibration. These vibration components use the energy generated by the high-pressure water flow to convert into mechanical vibration. The specific method of making the hydraulic vibration device 5 generate high-frequency vibration is the existing technology, such as the torsion spring hydraulic oscillator disclosed in CN201710791076.4.

[0029] In the utility model, the plugging device 6 is a water bag made of elastic material and surrounding the outside of the drill rod 1. Water is injected into the water bag to expand it for plugging. The water bag can be made of high-elasticity and high-strength rubber.

[0030] Among them, the plugger 6 is arranged in a ring outside the drill rod 1 and can slide on the drill rod 1. The position of the plugger 6 is fixed and does not move with the drill rod 1. The plugger 6 has a water injection port 7. Another high-pressure water is injected into the plugger 6 through the water injection port 7 to make it expand, so as to block the opening of the borehole 12.

[0031] Preferably, the opening of the bore 12 is also fixedly connected to a plug located at the rear side of the plug 6 ( Figure 2 A support seat 8 is provided to support it (below the borehole 13), and the plugger 6 is fixed on the support seat 8. The water injection port 7 of the plugger 6 extends through the support seat 8 to the rock tunnel 14 outside the borehole 13.

[0032] Further preferably, a plurality of wear-resistant metal sheets are circumferentially arranged at intervals on the inner wall of the occluder 6 to increase its strength and wear resistance.

[0033] The process of using the infiltration device of the utility model is as follows:

[0034] Step 1: Select the target coal seam 13, and the construction personnel connect the drill rod 1 to the drilling rig in the rock tunnel 14.

[0035] Step 2: The high-pressure water provided by the water supply device 2 enters the drill rod 1, and the high-pressure water in the drill rod 1 is pressurized by the turbine 9. The hydraulic drill bit 3 rotates under the hydraulic action of the high-pressure water, and the drill rod 1 is fed into the drill rig at the same time. The drill rod 1 is drilled to form a borehole 12, and the drill rod 1 is sent to a designated position in the coal seam 13. According to the information provided by the coal mining enterprise, the crack initiation position of the coal body is determined by judging the thickness of the coal seam 13. The designated position is the crack initiation position, and the crack initiation position of the coal body can be controlled by controlling the position of the drill rod 1.

[0036] Step three: After the drill pipe 1 reaches the designated position, drilling is suspended, and the opening of the borehole 12 is sealed with a plug 6. High-pressure water is injected into the drill pipe 1 through the water supply device 2. The high-pressure water in the drill pipe 1 is pressurized by the turbine 9, and the high-pressure water is sprayed out through the hydraulic nozzle 4 to perform hydraulic fracturing and permeability enhancement operations. When the high-pressure water passes through the movable valve disc 11 and the static valve disc 10, the hydraulic pulses generated act on the hydraulic vibration device 5 to generate high-frequency vibrations, and high-frequency vibration permeability enhancement operations are performed to simultaneously perform hydraulic fracturing and permeability enhancement and high-frequency vibration permeability enhancement.

[0037] Step 4: After the permeability enhancement operation at the designated position is completed, the accumulated water in the plugger 6 and the borehole 12 is released, and high-pressure water is continuously injected into the drill pipe 1. Under the action of the hydraulic drill bit 3, the drill pipe 1 drills forward to the next designated position and then pauses. The hydraulic nozzle 4 performs hydraulic fracturing and permeability enhancement operation at the new position, and the hydraulic vibration device 5 performs high-frequency vibration and permeability enhancement operation at the new position until the hydraulic fracturing and high-frequency vibration permeability enhancement of the entire borehole 12 are completed.

[0038] Step 5: After the permeability enhancement is completed, the water in the borehole 12 is discharged, the permeability enhancement device is removed, and the borehole 12 is connected to the gas extraction pipeline.

[0039] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A coal seam high frequency vibration assisted hydraulic fracturing permeability enhancement device, characterized in that: It includes a drill rod with a hollow front end and a drill bit, a plug for plugging a borehole opening, the drill bit is a hydraulic drill bit driven by water power, a water supply device is connected to the water inlet of the drill rod, the interior of the drill rod is a water flow channel, and high-pressure water provided by the water supply device can enter the drill rod; The drill rod is connected to a drilling rig, and under the action of the drilling rig and a hydraulic drill bit, the drill rod can drill a hole in a target coal seam or rock stratum; A plurality of hydraulic nozzles located at the rear side of the hydraulic drill bit are installed on the side wall of the drill rod, and a hydraulic vibration device driven by water power is installed in the drill rod.

2. The coal seam high-frequency vibration-assisted hydraulic fracturing permeability enhancement device according to claim 1 is characterized in that: The plugging device is a water bag made of elastic material and surrounding the outside of the drill rod. Water is injected into the water bag to expand it for plugging.

3. The coal seam high-frequency vibration assisted hydraulic fracturing permeability enhancement device according to claim 2 is characterized in that: The plugger can slide on the drill rod and has a water injection port.

4. The coal seam high-frequency vibration-assisted hydraulic fracturing permeability enhancement device according to claim 3 is characterized in that: The opening of the drilled hole is also fixedly connected to a support seat located at the rear side of the occluder to support it.

5. The coal seam high-frequency vibration-assisted hydraulic fracturing permeability enhancement device according to claim 4 is characterized in that: The plugger is fixedly connected to the support seat, and the water injection port of the plugger passes through the support seat and extends to the outside of the borehole.

6. The coal seam high frequency vibration assisted hydraulic fracturing permeability enhancement device according to any one of claims 1 to 5, characterized in that: A turbine located between the hydraulic nozzle and the hydraulic vibration device is installed in the drill rod, and a static valve disc and a dynamic valve disc are sequentially arranged between the hydraulic drill bit and the hydraulic nozzle in the drill rod.

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