CN114607321A - Coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and method - Google Patents
Coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and method Download PDFInfo
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- CN114607321A CN114607321A CN202210311898.9A CN202210311898A CN114607321A CN 114607321 A CN114607321 A CN 114607321A CN 202210311898 A CN202210311898 A CN 202210311898A CN 114607321 A CN114607321 A CN 114607321A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 238000002347 injection Methods 0.000 title claims abstract description 100
- 239000007924 injection Substances 0.000 title claims abstract description 100
- 239000003245 coal Substances 0.000 title claims abstract description 96
- 238000000605 extraction Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000003116 impacting effect Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 21
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 238000005422 blasting Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention provides a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and a method. And a frequency modulation test stage is carried out before a frequency shift permeability increasing stage, the frequency band which causes the coal body resonance is determined according to the frequency band of the ultrasonic wave corresponding to the maximum vibration state of the coal body measured by the sensor, the resonance frequency band is adopted as the working frequency band of the ultrasonic generator in the subsequent permeability increasing stage, the size of the coal seam modification hole is large, the permeability increasing range is large, and gas extraction is facilitated.
Description
Technical Field
The invention belongs to the technical field of coal seam mining, and particularly relates to a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and method.
Background
Coal mine gas is the main culprit of coal mine disasters and is a non-renewable clean energy source, and coal and gas co-mining is a fundamental technology for realizing gas outburst prevention and resource utilization. In order to improve the gas extraction rate of the coal seam, a plurality of coal seam permeability increasing methods are proposed at home and abroad in succession, and the method comprises the following steps: a hydraulic fracturing permeability increasing method, a hydraulic slotting permeability increasing method, a gas explosion permeability increasing method, a loosening blasting permeability increasing method, a hydraulic punching permeability increasing method, an ultrasonic excitation permeability increasing method and the like.
The ultrasonic excitation permeability-increasing technology is an increasing and mining technology which is not limited by geological conditions of a coal reservoir and gas source characteristics and has common application. However, the existing ultrasonic excitation anti-reflection technology adopts fixed-frequency ultrasound for anti-reflection, but the frequency is not suitable for all coal seams, so that the anti-reflection range of the coal seams is small, the size of pores for coal seam modification is narrow, the operation efficiency is low, and the anti-reflection effect needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and the first purpose of the invention is to provide a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device. The second purpose of the invention is to provide an extraction method by utilizing the coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device.
In order to achieve the first purpose, the invention adopts the following technical scheme: a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device comprises a plurality of drill holes arranged in a coal body, wherein the drill holes comprise extraction drill holes and water injection drill holes, and hole packers are arranged at orifices of the drill holes; an extraction pipe is arranged in the extraction drill hole, the extraction pipe penetrates through the hole packer to be connected with extraction equipment positioned outside the extraction drill hole, a water injection pipe is arranged in the water injection drill hole, and the water injection pipe penetrates through the hole packer to be connected with water injection equipment positioned outside the water injection drill hole; the anti-reflection extraction device also comprises an ultrasonic transducer and a sensor for detecting the vibration of the coal body, wherein one of the ultrasonic transducer and the sensor is positioned in the extraction drill hole, and the other one is positioned in the water injection drill hole; the connecting line of the sensor penetrates through the hole packer to be connected with a control system positioned outside the drilled hole, and the signal output end of the sensor is connected with the input end of the control system; the connecting circuit of the ultrasonic transducer penetrates through the hole packer to be connected with an ultrasonic generator with adjustable frequency and positioned outside the drill hole, the output control end of the control system is connected with the frequency modulation end of the ultrasonic generator, the ultrasonic transducer emits ultrasonic waves, and the sensor detects the coal body vibration with different ultrasonic frequencies and transmits the vibration condition to the control system.
In the technical scheme, the hydraulic fracturing technology and the ultrasonic fracturing technology are combined by arranging the water injection equipment, the water injection pump, the ultrasonic generator and the ultrasonic transducer, and water with certain pressure is injected into each water injection drill hole through the water injection equipment to perform primary fracturing on the coal body; the ultrasonic generator and the ultrasonic transducer continuously emit ultrasonic waves to the coal body, secondary fracturing is carried out on the coal body, so that the number of fractures and the length of the fractures of the coal bed are greatly increased, and the ventilation of the coal bed is favorably increased. The coal body vibration condition when the ultrasonic frequency is different is detected by arranging the sensor, the vibration condition is transmitted to the control system, the frequency band of the ultrasonic wave corresponding to the coal body vibration maximum state is determined by the control system to be the frequency band causing the coal body resonance, and the resonance frequency band is the working frequency band of the ultrasonic generator in the ultrasonic anti-reflection process. By arranging the sensor, the invention can perform ultrasonic permeability increase on different coal bodies by adopting ultrasonic waves with different frequencies, solves the attenuation problem, enhances the permeability increase range, has large size of coal seam reconstruction holes, high operation efficiency and good permeability increase effect.
In a preferred embodiment of the invention, the extraction drill hole and the ultrasonic anti-reflection drill hole are arranged in parallel side by side.
In a preferred embodiment of the invention, the sensor is arranged against the wall of the borehole. The real vibration situation of the coal body can be better detected.
In a preferred embodiment of the invention, the sensor is a vibration sensor and/or an acceleration sensor. The vibration sensor and the acceleration sensor can measure the vibration condition of the coal body.
In a preferred embodiment of the invention, the number of the sensors in one borehole is multiple, and the multiple sensors are arranged at intervals along the length direction of the extraction borehole.
In the technical scheme, because the number of the sensors is set according to actual conditions, different sensors detect the vibration conditions of corresponding positions of the sensors, the control system records the relation curve between the vibration conditions of the coal body measured by different sensors and the change of ultrasonic frequency, the maximum frequency corresponding to inflection points of the relation curve is used as the working frequency of the ultrasonic generator, or the working frequency of the ultrasonic generator is set between ultrasonic frequency bands corresponding to the ultrasonic frequencies of the inflection points of the relation curve.
In another preferred embodiment of the present invention, the number of the ultrasonic transducers in a borehole is two or more, the two or more ultrasonic transducers are arranged in parallel and spaced apart along the length direction of the borehole, and the two or more ultrasonic transducers are connected to one ultrasonic generator or a plurality of ultrasonic generators.
In the technical scheme, two or more ultrasonic transducers are arranged in one drill hole, and the coal is subjected to segmented operation in a plurality of sections along the length direction of the drill hole, so that the coal is increased in permeability, and the operation efficiency is high.
In another preferred embodiment of the present invention, a display device is further connected to the control system.
In the technical scheme, the display device is arranged, so that people can conveniently read and monitor the vibration condition of the coal and the ultrasonic frequency emitted by the ultrasonic generator, and the relation curve of the ultrasonic frequency and the vibration can be conveniently obtained.
In order to achieve the second purpose, the invention adopts the following technical scheme: the extraction method of the coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device comprises the following steps: and (3) water injection fracturing stage: starting water injection equipment, injecting water into the water injection drill hole through a water injection pipe by the water injection equipment, keeping the water pressure in the water injection drill hole to reach a set value after the water injection drill hole is filled with water, stopping injecting water into the water injection drill hole, and closing the water injection equipment, wherein the water in the water injection drill hole is used for performing primary fracturing on coal; and (3) frequency modulation test stage: maintaining the water pressure in the water injection drill hole, starting the ultrasonic generator and gradually increasing the frequency of the ultrasonic generator, and enabling the ultrasonic transducer to emit ultrasonic waves in the drill hole; the sensor detects the vibration of the medium when the ultrasonic transducer emits ultrasonic waves and transmits a vibration signal to the control system; the control system receives and records the vibration signal; the control system determines the frequency band of the ultrasonic wave corresponding to the maximum vibration state of the coal body as the frequency band causing the resonance of the coal body; frequency shift anti-reflection stage: maintaining the water pressure in the water injection drill hole, carrying out frequency modulation on an ultrasonic generator by a control system to enable the frequency of the ultrasonic generator to fall into the frequency band range of the resonance of the coal body, continuously working the ultrasonic generator for a period of time under the resonance frequency band, carrying out secondary fracturing on the coal body to achieve the effect of impacting the coal body to generate new fractures, and after the coal bed is anti-reflection, closing the ultrasonic generator and taking out an ultrasonic transducer from the drill hole; and (3) extraction stage: and starting the extraction equipment to extract gas.
In the technical scheme, the hydraulic fracturing technology and the ultrasonic fracturing technology are combined, the coal body is subjected to primary fracturing by using hydraulic power, and then is subjected to secondary fracturing by using ultrasonic waves, so that the number of coal seam fractures and the length of the fractures are greatly increased, and the air permeability of the coal seam is favorably increased. And before the frequency shift permeability increasing stage, a frequency modulation test stage is carried out, the frequency band which causes the coal body to resonate is determined according to the frequency band of the ultrasonic wave corresponding to the coal body vibration maximum state measured by the sensor, the resonant frequency band is adopted as the working frequency band of the ultrasonic generator in the subsequent permeability increasing stage, the size of the coal seam transformation hole is large, the permeability increasing range is large, and the gas extraction is facilitated.
In another preferred embodiment of the invention, in the stage of water injection fracturing, the set value of the water pressure in the water injection drill hole is 0.5-1 Mpa; in the frequency modulation test stage, the frequency of the ultrasonic generator is gradually increased from 15kHz to 100kHz, the frequency bands are separated by 5kHz, each frequency band is kept for 2-3 minutes, and the whole cycle is carried out for 3 times; in the frequency shift anti-reflection stage, the ultrasonic generator continuously works for more than 3 hours under the resonance frequency band so as to perform secondary fracturing on the coal body.
In the technical scheme, the frequency of the ultrasonic generator is gradually increased from 15kHz at low frequency to 100kHz at high frequency, the duration of each frequency band is fixed and is 2-3 minutes, so that frequency-optimized data can be provided for a frequency modulation experiment stage conveniently; in the frequency shift anti-reflection stage, the ultrasonic anti-reflection time is long, and the anti-reflection effect is good.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to an embodiment of the application.
Fig. 2 is another schematic structural diagram of a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to the embodiment of the application.
Reference numerals in the drawings of the specification include: the device comprises a coal body 1, a water injection drill hole 2, an extraction drill hole 3, a hole packer 4, an ultrasonic transducer 5, an ultrasonic generator 6, a control system 7, a sensor 8, an extraction pipe 9, extraction equipment 10, a display device 11, a water injection pipe 12 and water injection equipment 13.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The invention provides a coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and an extraction method.
As shown in fig. 1 and 2, in a preferred embodiment, the permeability-increasing extraction device comprises a plurality of drill holes arranged in a coal body 1, the drill holes comprise an extraction drill hole 3 and a water injection drill hole 2, the extraction drill hole 3 and the water injection drill hole 2 are arranged in parallel side by side, and hole packers 4 are arranged at the hole openings of the drill holes. The water injection drill holes 2 and the extraction drill holes 3 are arranged in a one-to-one correspondence manner, and fig. 1 and 2 show that one extraction drill hole 3 and one water injection drill hole 2 are arranged, and the number of the specific extraction drill holes 3 and the number of the water injection drill holes 2 are set according to actual conditions.
An extraction pipe 9 is arranged in the extraction borehole 3, the extraction pipe 9 penetrates through the hole packer 4 to be connected with extraction equipment 10 positioned outside the extraction borehole 3, the extraction equipment 10 is the prior art, and the structure and the principle of the extraction equipment 10 are not detailed herein; when a plurality of extraction boreholes 3 are provided, a plurality of extraction pipes 9 respectively inserted into the plurality of extraction boreholes 3 may be connected to the same extraction device 10. A water injection pipe 12 is arranged in the water injection drill hole 2, the water injection pipe 12 penetrates through the hole packer 4 and is connected with a water injection device 13 positioned outside the water injection drill hole 2, and the water injection device 13 can be a water pump and is used for applying pressure water to the water injection drill hole 2; when a plurality of water injection boreholes 2 are provided, a plurality of water injection pipes 12 respectively inserted into the plurality of water injection boreholes 2 may be connected with the same water injection apparatus 13. The anti-reflection extraction device further comprises an ultrasonic transducer 5 and a sensor 8 for detecting vibration of the coal body 1, as shown in fig. 1 and 2, one of the ultrasonic transducer 5 and the sensor 8 is located in the extraction drill hole 3, and the other is located in the water injection drill hole 2.
The connecting line of the sensor 8 penetrates through the hole packer 4 to be connected with a control system 7 located outside a drill hole, the control system 7 is connected with a display device 11, the signal output end of the sensor 8 is connected with the input end of the control system 7, the sensor 8 detects the vibration condition of the coal body 1 when the ultrasonic frequency is different (the specific sensor 8 can detect the vibration frequency and the vibration amplitude of the coal body 1), and the vibration condition is transmitted to the control system 7. Preferably, the sensor 8 is arranged close to the hole wall of the extraction drill hole 3, and the sensor 8 is a vibration sensor 8 or an acceleration sensor 8. The number of the sensors 8 in one borehole is multiple, the sensors 8 are arranged at intervals along the length direction of the extraction borehole 3, and three sensors 8 are arranged in one borehole as shown in fig. 1 and 2.
The connecting line of the ultrasonic transducer 5 penetrates through the hole packer 4 to be connected with an ultrasonic generator 6 with adjustable frequency outside a drilled hole, the output control end of the control system 7 is connected with the frequency modulation end of the ultrasonic generator 6, the ultrasonic transducer 5 emits ultrasonic waves, and the sensor 8 detects the vibration of the coal body 1 with different ultrasonic frequencies and transmits the vibration condition to the control system 7. One or more ultrasonic transducers 5 can be installed in one drill hole, when two or more ultrasonic transducers 5 are installed, the two or more ultrasonic transducers 5 are arranged in parallel and distributed in a plurality of sections in the length direction of the drill hole, and the coal body 1 is subjected to segmented operation and permeability increasing. Preferably, a plurality of ultrasonic transducers 5 in a borehole are connected in common to an ultrasonic generator 6, so that the ultrasonic frequencies emitted by the plurality of ultrasonic transducers 5 in a borehole are identical. The ultrasonic transducers 5 in different drill holes are connected with an ultrasonic generator 6 together, and the emitted ultrasonic frequencies are the same; or the ultrasonic transducers 5 in different boreholes are respectively connected with different ultrasonic generators 6, so that the ultrasonic transducers 5 in different boreholes can emit ultrasonic waves with the same or different frequencies.
The extraction method of the anti-reflection extraction device comprises the following steps:
and (3) water injection fracturing stage: and starting the water injection equipment 13, wherein the water injection equipment 13 injects water into the water injection drill hole 2 through the water injection pipe 12, the water injection pressure is low pressure and is about 0.5-1Mpa, and the water injection pressure can be preset. After the water injection drill hole 2 is filled with water, the water pressure in the water injection drill hole 2 is kept to be 0.5-1Mpa (namely a set value), and the water in the water injection drill hole 2 performs primary fracturing on the coal body 1. And (3) continuously maintaining the pressure after the water injection drill hole 2 is filled with water, and supplementing water through a water injection device 13 after the water is lost, so that the cracks of the coal body 1 around the water injection drill hole 2 are ensured to be filled with water, and a water medium is provided for the transmission of the ultrasonic wave.
And (3) frequency modulation test stage: keeping the water pressure in the water injection drill hole 2, starting the ultrasonic generator 6 and gradually increasing the frequency of the ultrasonic generator 6, and sending out ultrasonic waves in the drill hole by the ultrasonic transducer 5; the sensor 8 detects the vibration of the medium when the ultrasonic transducer 5 emits ultrasonic waves and transmits a vibration signal to the control system 7; the control system 7 receives and records the vibration signal; the control system 7 recognizes the frequency band of the ultrasonic wave corresponding to the state where the coal 1 vibrates maximally as the frequency band causing the coal 1 to resonate. In the frequency modulation test stage, the frequency of the ultrasonic generator 6 can be gradually increased from 15kHz at low frequency to 100kHz at high frequency, the frequency bands are separated by 5kHz, each frequency band is kept for 2-3 minutes, and the whole cycle is carried out for 3 times. Each band cycles for an equal length from low to high frequencies.
Frequency shift anti-reflection stage: keeping the water pressure in the water injection drill hole 2, adjusting the frequency of the ultrasonic generator 6 by the control system to enable the frequency of the ultrasonic generator 6 to fall within the resonant frequency band range of the coal body 1, continuously working the ultrasonic generator 6 under the resonant frequency band for a period of time (preferably continuously working for more than 3 hours), performing secondary fracturing on the coal body 1 to achieve the effect of impacting the coal body 1 to generate new fractures, closing the ultrasonic generator 6 and taking out the ultrasonic transducer 5 from the drill hole after the coal bed is subjected to anti-reflection.
And (3) extraction stage: and starting the extraction equipment 10 to extract gas.
In the frequency modulation test stage, when the number of the extraction drill holes 3 and the number of the water injection drill holes 2 are two or more and a plurality of ultrasonic generators 6 are arranged, ultrasonic Pij with different frequencies are sequentially applied to different ultrasonic generators 6, the control system 7 acquires Nijk when a detection signal of the sensor 8 is strongest, wherein i is the serial number of the ultrasonic generator 6, j is the adopted frequency, k is the serial number of the sensor 8, Nijk is the vibration generated by the sensor k under the influence of the ultrasonic j emitted by the ultrasonic generator i, i and k are positive integers, and j is a frequency value.
The control system 7 acquires the corresponding ultrasonic frequency Pk (i ' j ') when the detection signal of the sensor k is strongest, wherein i ' is the serial number of the ultrasonic generator when the detection signal of the sensor k is strongest, and j ' is the frequency adopted by the ultrasonic generator i ' when the detection signal of the sensor k is strongest.
The ith 'ultrasonic generator works by adopting the frequency j', if the detection signals of the different sensors are strongest and correspond to the condition that the same ultrasonic generator sends ultrasonic waves with different frequencies, the ultrasonic generator judges which detection signal of the sensors is strongest, and the ultrasonic generator works by adopting the frequency corresponding to the strongest value.
According to the scheme, the ultrasonic waves with different frequencies are sequentially applied to different ultrasonic generators, so that the coal body is cracked by applying the ultrasonic waves in a differentiation manner, and the large-range rapid permeability increase of the coal bed is facilitated.
In another preferred embodiment of the present invention, an ultrasonic transducer may be further provided, the ultrasonic transducer is preferably disposed in a spherical waterproof housing, the housing is preferably made of a plastic with certain hardness, such as epoxy resin, and a storage battery is disposed in the spherical housing to supply power to the ultrasonic transducer. The spherical wireless ultrasonic transducers are connected in series by flexible materials to form a spherical wireless ultrasonic transducer string, the fixed end of the flexible materials of the spherical wireless ultrasonic transducer string is fixed at the drilling hole, when water is injected, the free end of the spherical wireless ultrasonic transducer string is released, the spherical wireless ultrasonic transducer string is preferably placed in the water injection drilling hole 2 in advance, enters a coal seam crack along with the action of water pressure, and is pulled and taken out by the fixed end after the operation is finished. The specific spherical wireless ultrasonic transducer can be designed into a size according to design requirements, for example, the diameter of the spherical wireless ultrasonic transducer is about 6 cm.
The spherical wireless ultrasonic transducer can work next time in a charging mode or a mode of replacing a storage battery.
More preferably, a power line is arranged in the flexible material, and a power supply unit connected with the power line is arranged in the spherical shell and is used for continuously supplying power to the ultrasonic transducer. By arranging the ultrasonic transducer which penetrates into the coal seam cracks, the permeability increasing efficiency of coal seam gas is improved.
In the description herein, reference to the description of the terms "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device is characterized by comprising a plurality of drill holes arranged in a coal body, wherein the drill holes comprise extraction drill holes and water injection drill holes, and hole packers are arranged at orifices of the drill holes;
an extraction pipe is arranged in the extraction drill hole, the extraction pipe penetrates through the hole packer to be connected with extraction equipment outside the extraction drill hole, a water injection pipe is arranged in the water injection drill hole, and the water injection pipe penetrates through the hole packer to be connected with water injection equipment outside the water injection drill hole;
the anti-reflection extraction device further comprises an ultrasonic transducer and a sensor for detecting the vibration of the coal body, wherein one of the ultrasonic transducer and the sensor is positioned in the extraction drill hole, and the other one is positioned in the water injection drill hole;
the connecting circuit of the sensor penetrates through the hole packer to be connected with a control system positioned outside the drilled hole, and the signal output end of the sensor is connected with the input end of the control system; the connecting circuit of the ultrasonic transducer penetrates through the hole packer to be connected with an ultrasonic generator with adjustable frequency and located outside a drill hole, the output control end of the control system is connected with the frequency modulation end of the ultrasonic generator, the ultrasonic transducer sends out ultrasonic waves, and the sensor detects coal body vibration at different ultrasonic frequencies and transmits the vibration condition to the control system.
2. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to claim 1, characterized in that the extraction drill hole and the ultrasonic permeability-increasing drill hole are arranged in parallel side by side.
3. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to claim 1, wherein the sensor is arranged close to the hole wall of the drill hole.
4. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to claim 1, wherein the sensor is a vibration sensor or an acceleration sensor.
5. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to claim 1, characterized in that the number of the sensors in one drill hole is multiple, and the sensors are arranged at intervals along the length direction of the extraction drill hole.
6. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to claim 1, wherein the number of the ultrasonic transducers in one drill hole is two or more, the two or more ultrasonic transducers are arranged in parallel and are arranged at intervals along the length direction of the drill hole, and the two or more ultrasonic transducers are connected with one ultrasonic generator or a plurality of ultrasonic generators.
7. The coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device according to any one of claims 1 to 6, wherein the control system is further connected with a display device.
8. An extraction method by using the coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device as claimed in any one of claims 1 to 7, is characterized by comprising the following steps:
and (3) water injection fracturing stage: starting water injection equipment, injecting water into the water injection drill hole through a water injection pipe by the water injection equipment, keeping the water pressure in the water injection drill hole to reach a set value after the water injection drill hole is filled with water, and performing primary fracturing on coal bodies by the water in the water injection drill hole;
and (3) frequency modulation test stage: maintaining the water pressure in the water injection drill hole, starting the ultrasonic generator and gradually increasing the frequency of the ultrasonic generator, and enabling the ultrasonic transducer to emit ultrasonic waves in the drill hole; the sensor detects the vibration of the medium when the ultrasonic transducer emits ultrasonic waves and transmits a vibration signal to the control system; the control system receives and records the vibration signal; the control system determines the frequency band of the ultrasonic wave corresponding to the maximum vibration state of the coal body as the frequency band causing the resonance of the coal body;
frequency shift anti-reflection stage: maintaining the water pressure in the water injection drill hole, carrying out frequency modulation on an ultrasonic generator by a control system to enable the frequency of the ultrasonic generator to fall into the frequency band range of the resonance of the coal body, continuously working the ultrasonic generator for a period of time under the resonance frequency band, carrying out secondary fracturing on the coal body to achieve the effect of impacting the coal body to generate new fractures, and after the coal bed is anti-reflection, closing the ultrasonic generator and taking out an ultrasonic transducer from the drill hole;
and (3) extraction stage: and starting the extraction equipment to extract gas.
9. A drainage method according to claim 8, characterized in that, in the water injection fracturing stage, the set value of the water pressure in the water injection borehole is 0.5-1 Mpa;
in the frequency modulation test stage, the frequency of the ultrasonic generator is gradually increased from 15kHz to 100kHz, the frequency bands are separated by 5kHz, each frequency band is kept for 2-3 minutes, and the whole cycle is carried out for 3 times;
and in the frequency shift anti-reflection stage, the ultrasonic generator continuously works for more than 3 hours under the resonance frequency band so as to perform secondary fracturing on the coal body.
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