CN109323972A - A kind of experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method - Google Patents
A kind of experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 312
- 230000035939 shock Effects 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005553 drilling Methods 0.000 claims abstract description 82
- 230000007246 mechanism Effects 0.000 claims abstract description 80
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 239000003380 propellant Substances 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000002474 experimental method Methods 0.000 claims description 29
- 230000006835 compression Effects 0.000 claims description 21
- 238000007906 compression Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 11
- 238000007689 inspection Methods 0.000 claims description 9
- 210000001367 artery Anatomy 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 210000003462 vein Anatomy 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 47
- 230000006378 damage Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 9
- 230000035699 permeability Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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Abstract
The present invention relates to coal bed gas (mine gas) production technique fields, the experimental provision of especially a kind of controllable shock wave fracturing coal seam with gas of multi- scenarios method, including high power pulse generating mechanism and shock-wave detection mechanism, drilling is preset in coal sample, the liquid of certain pressure is marked in the drilling, the high power pulse generating mechanism is connected by conducting wire with drilling, when the high power pulse generating mechanism being made to work, liquid propellant high power pulse of the high power pulse generating mechanism into the drilling, shock wave is formed in the liquid, coal sample described in fracturing, the shock-wave detection mechanism is matched with the coal sample, it detects and analyzes the impact wave characteristic in the coal sample.Using the invention has the benefit that pulse energy required when can determine preferable to coal body fracturing effect, shock wave characteristic, the damage and failure rule of shock wave coal body are studied, and carry out numerical Analysis to the shock wave fracturing coal body rule of different wave and energy.
Description
Technical field
The present invention relates to coal bed gas (mine gas) production technique field, especially a kind of controllable shock wave of multi- scenarios method is caused
Split the experimental provision of coal seam with gas.
Background technique
In recent years, with the development of science and technology, China made breakthrough progress the exploitation in coal seam.With China
The increase year by year of coal demand, China also gradually shift the exploitation in coal seam to deep.Deep fractures gas pressure is big, gas contains
Amount is high, is easy to cause generation coal and gas prominent dynamic disaster in Mine Production.In order to prevent and treat generation coal and gas prominent
Disaster, it is ensured that safety in production needs to carry out extraction to the gas in coal seam before exploiting coal seam.However, deep fractures
Gas permeability it is generally lower, thus gas drainage difficulty is larger, in order to reduce the difficulty of gas drainage, needs before mash gas extraction
Take measures to increase the permeability in coal seam.
Coal seam fracturing anatonosis technology is to solve the generally existing micropore of deep low air permeability coal seam, low-permeability and high absorption
The important method of problem, scholar both domestic and external have carried out a large amount of explorations to coal seam fracturing anatonosis technology, have made some progress.
Currently used coal seam anatonosis technology mainly has: exploitation protective layer, intensive drilling, hydraulic fracturing, high-pressure water jet slot and
Deep hole standing shot etc..It is the generally existing complex process of these technologies, great in constructing amount, at high cost and the disadvantages of be of limited application.
In recent years, High pulse power technology is suggested applied to the anti-reflection field in coal seam, achieved in application at the scene compared with
Good effect.During increasing coal seam permeability using High pulse power technology, it was discovered by researchers that high power pulse skill
Art acts on influence of the anatonosis effect in coal seam by pulse energy and coal body itself physicochemical characteristics, i.e., is caused using high power pulse
When splitting coal body, the high power pulse of different pulse energies is selected to carry out fracturing, coal body after fracturing to the coal body of identical physicochemical characteristics
Permeability it is not identical；It selects the high power pulse of identical pulse energy to carry out fracturing to the coal body of different physicochemical characteristics, causes
The permeability for splitting rear coal body is not also identical.
During seam mining, the coal seam of different regions, its own physicochemical characteristics is identical.Using high power arteries and veins
When rushing fracturing coal body, in order to ensure the coal body after fracturing has preferable permeability, need to determine in advance to coal body fracturing effect
Required pulse energy when preferably.
Summary of the invention
Goal of the invention of the invention is: when for using high power pulse fracturing coal body, how to determine to coal body fracturing
When effect is preferable the problem of required pulse energy, a kind of experiment of controllable shock wave fracturing coal seam with gas of multi- scenarios method is provided
Device.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method, including high power pulse generating mechanism
With shock-wave detection mechanism, drilling is preset in coal sample, the liquid of certain pressure, the high power pulse are marked in the drilling
Generating mechanism is connected by conducting wire with the drilling, when the high power pulse generating mechanism being made to work, the high power arteries and veins
Liquid propellant high power pulse of the generating mechanism into the drilling is rushed, forms shock wave, coal described in fracturing in the liquid
Sample, the shock-wave detection mechanism are matched with the coal sample, are detected and are analyzed the impact wave characteristic in the coal sample.
The high power pulse of the application refers to pulse power in the pulse of 10KW or more.Shock wave inspection in above scheme
Surveying mechanism can be selected shock-wave detection instrument common on the market.Liquid in above scheme can be selected water or other it is existing can be with
By the energetic material of electric initiation.In above scheme, by drilling preset in coal sample, and into drilling inject certain pressure liquid
Body, when the work of high power pulse generating mechanism, liquid propellant high power pulse of the high power pulse generating mechanism into drilling,
Shock wave, fracturing coal sample are formed in a liquid.It is preferable to the fracturing effect of coal sample progress fracturing in this manner.
Need to produce the identical coal sample of multiple groups according to experiment before experiment starts.When experiment, by shock-wave detection mechanism
Multiple sensors be embedded in coal sample inside different location, then make high power pulse generating mechanism with different pulse energies
High power pulse the liquid filled in the drilling of different groups of coal sample is punctured, make liquid generate shock wave to coal sample into
Row fracturing, and pulse energy corresponding to each group coal sample is recorded one by one.The failure mode of coal sample can be divided into tension destruction and resistance to compression
It destroys, the destruction near drilling is usually Compressive failure.The tensile strength of coal sample is less than its compression strength, as shock wave exists
It is propagated in coal sample, the damage capability of shock wave is gradually reduced, when the Compressive failure that can not cause coal sample of shock wave, coal sample
Failure mode is changed into tension destruction.Shock-wave detection mechanism analyzes collected shockwave signal, can know coal
Different zones are by the form destroyed in sample, while shock-wave detection mechanism divides the position of collected shockwave signal
Analysis, so as to obtain the size in coal sample by the region destroyed.By comparing in different groups of coal samples by the region destroyed
Size, that is, can determine the maximum one group of coal sample in internal sabotage region.By inquiring pulse energy corresponding to this group of coal sample i.e.
It can determine pulse energy required when keeping coal sample fracturing effect preferable, thus when solving using high power pulse fracturing coal sample,
When how to determine preferable to coal body fracturing effect the problem of required pulse energy.
During using high power pulse fracturing coal body, it was discovered by researchers that using the high power of identical pulse energy
During the same coal body of pulse pair carries out fracturing, when carrying out the frequency difference of fracturing to same coal body, i.e., in certain time
When the interior number difference for carrying out fracturing to same coal body, the fracturing effect of coal body is not also identical.In order to ensure the coal body after fracturing
With preferable permeability, which kind of frequency is selected to carry out fracturing to coal body for this reason, it may be necessary to determine in advance.
It is tested using the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method described in above scheme
When, it keeps selecting different pulse energies to be tested in the identical situation of frequency to coal body progress fracturing, determining and cause first
Split effect it is good when required pulse energy；Then in the case where keeping the pulse energy of high power pulse constant, using different
Frequency carries out fracturing to different groups of coal sample.After the completion of fracturing, is detected by the inside of the coal sample to different groups, determine hole
The maximum one group of coal sample of gap rate can determine that the fracturing effect of coal sample is good when which kind of frequency to carry out fracturing to coal sample with.
In above scheme, the shockwave signal in coal sample is detected and is analyzed using shock-wave detection mechanism,
To which the failure mechanism that researcher can be realized the generation to high power pulse shock wave, the mechanism of transmission and coal sample is divided
Analysis, while can also realize the experimental study of shock wave characteristic, shock wave fracturing coal sample rule, and rush to different wave energy
It hits wave fracturing rule and carries out numerical Analysis.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes acoustic emission detection
Mechanism, the acoustic emission detection mechanism are matched with the coal sample, are detected and are analyzed the characteristics of Acoustic Emission in the coal sample.
Acoustic emission detector common on the market can be selected in acoustic emission detection mechanism in above-mentioned preferred embodiment.When experiment,
The sensor of acoustic emission detection mechanism is fitted in the surface of coal sample, subsequent high power pulse generating mechanism emits high power pulse
Fracturing is carried out to coal sample, the different zones in coal sample gradually rupture, and generate acoustic emission signal, the inspection of acoustic emission detection mechanism
The acoustic emission signal generated when different zones rupture is surveyed, and records the sequencing of the acoustic emission signal detected.It is caused to coal sample
After the completion of splitting, acoustic emission detection mechanism analyzes collected acoustic emission signal, and is modeled using computer, can
Clearly reflection coal sample different zones generate the dynamic process destroyed on computers.By to sound emission and shock wave jointly into
Row analysis, can more accurately obtain the rupture range inside coal sample.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes three axis compression trains
System, the three axis compression system are matched with the coal sample, apply triaxial pressure to the coal sample.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes gas injection system
System, the gas injected system are matched with the coal sample, when the gas injected system being made to work, the gas injected system
Gas is injected to the inside of the coal sample.
Coal resource is one of China's main energy sources, with the development of economy, is gradually changed to deep to the exploitation of coal resource.
The features such as high-ground stress, high methane possessed by deep fractures and low-permeability, has seriously affected the safe working of coal.Therefore,
Carry out coal seam containing gas under complex stress, especially compared with the Acoustic emission under high confining pressure and high methane pressure, to taking off
Show the spatial-temporal distribution characteristic of deep high methane coal and rock micro rupture test specimen under different ambient stresses, ensures deep high gas layer peace
Standard-sized sheet, which is adopted, to be of great significance.
The experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method described in above-mentioned preferred embodiment further includes
Three axis compression systems and gas injected system, when experiment, three axis compression systems apply triaxial pressure to coal sample, simulate deep fractures
The high-ground stress being subject to, gas injected system inject gas, high methane pressure existing for simulation coal petrography inside to the inside of coal sample.
During experiment, acoustic emission detection mechanism is acquired and analyzes to the acoustic emission signal inside coal body, can obtain
To sound emission space distribution rule, ruptured so that researcher can analyze the coal containing methane gas under compared with high confining pressure and high methane pressure
Sound emission temporal and spatial evolution in the process inquires into influence of the gas pressure to characteristics of Acoustic Emission.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes gas pressure inspection
Mechanism is surveyed, the gas pressure detection mechanism is matched with the coal sample, detects the gas pressure in the coal sample.
High pulse power technology acts on influence of the anatonosis effect in coal seam by the coal seam atmospheric pressure in coal seam, that is, works as coal
Layer in coal seam atmospheric pressure difference when, using identical pulse energy high power pulse to coal body carry out fracturing fracturing effect simultaneously
It is not identical.In above-mentioned preferred embodiment, by the way that gas pressure detection mechanism is arranged, the inspection to coal sample inside gas pressure is realized
It surveys, so as to clearly obtain coal sample under what gas pressure, the fracturing effect by high power pulse is best.
Preferably, the high power pulse generating mechanism includes high power pulsed source, high power pulse switch and height
Power pulse capacitor, the conducting wire include the first conducting wire segment, the second conducting wire segment and privates segment, the high power
It is connected between the pulse power and the high power pulse capacitor by first conducting wire segment, second conducting wire segment
One end be connected with the anode of the high power pulse capacitor, the other end protrudes into the drilling, the privates section
One end of section is connected with the cathode of the high power pulse capacitor, and the other end protrudes into the drilling, the high power arteries and veins
It washes pass open to be arranged on second conducting wire segment or the privates segment, controls the high power pulse capacitor and institute
State the on off operating mode of circuit between coal sample.
In above-mentioned preferred embodiment, high power pulse generating mechanism include high power pulsed source, high power pulse switch with
And high power pulse capacitor, it is connected between high power pulsed source and high power pulse capacitor by the first conducting wire segment
It connects, one end of the second conducting wire segment is connected with the anode of high power pulse capacitor, and the other end protrudes into drilling, privates
One end of segment is connected with the cathode of high power pulse capacitor, and the other end protrudes into drilling, high power pulse switch setting
On the second conducting wire segment or privates segment.In use, disconnecting high power pulse switch first, and keep high power pulse electric
Source charges to high power pulse capacitor, the voltage between positive electrode and negative electrode by measuring high power pulse capacitor,
The pulse energy stored in high power pulse capacitor can be calculated.When the electricity being filled with to high power pulse capacitor meets
When requirement of experiment, high power pulsed source is made to stop charging to high power pulse capacitor, then closes high power pulse switch
Close, at this time high power pulse capacitor release certain pulses energy high-voltage pulse, generate shock wave in a liquid, to coal sample into
Row fracturing.Meanwhile by high power pulsed source in control certain time to the number of the charging of high power pulse capacitor, with
And the number that high power pulse closes the switch, it can be realized and fracturing is carried out to coal sample with specific frequency.
It is carried out using the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method described in above-mentioned preferred embodiment
Experiment is not only able to be realized more conveniently with the high power pulse of certain pulses energy to coal sample progress fracturing, and can also
Enough realize more conveniently carries out fracturing to coal sample with specific frequency.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes plugging block and company
Extension bar, for blocking the drilling, the connecting rod is made of hard material the plugging block, and one end of the connecting rod is to put
Electric end is provided with discharger on the discharge end, and the anode of the discharger is connected with second conducting wire segment, described to put
The cathode of electric appliance is connected with the privates segment, and first through hole is provided in the plugging block, the first through hole
Inner wall and the outer wall of the connecting rod match, and the discharge end passes through the inside that the first through hole extends to the drilling.
Discharger common on the market can be selected in discharger described in above-mentioned preferred embodiment.By the way that plugging block is arranged, keep away
Exempt from high power pulse liquid after the liquid in breakdown drilling to spray from the opening of drilling and weaken shock wave, while can
Realize the liquid that certain pressure is injected into drilling.During experiment, in order to keep the effect of fracturing coal sample preferable, usually need
The end of the end of second conducting wire segment and privates segment is extend into as much as possible in drilling, while being necessary to ensure that
Spacing between two conducting wire segment ends and privates segment end meets electric discharge and requires.However, the material of most conducting wire
Matter is softer, thus the first conducting wire segment and the second conducting wire segment passed through extend into after first through hole the operation of foot of hole compared with
Difficulty, while after the first conducting wire segment and the second conducting wire segment pass through first through hole, the end and second of the first conducting wire segment
Spacing between the end of conducting wire segment is difficult to ensure.Connecting rod is made by using hard material, in the discharge end of connecting rod
Upper setting discharger, while the anode of discharger being made to be connected with the second conducting wire segment, make the cathode and privates of discharger
Segment is connected, and the outer wall of the inner wall and connecting rod that make first through hole matches, after discharge end is passed through first through hole when experiment
Extend to the inside of drilling, it is ensured that the end of the second conducting wire segment and the end of privates segment can be extend into as much as possible
In drilling, while being provided with discharger, it is ensured that the spacing between the second conducting wire segment end and privates segment end is full
Foot electric discharge requires.
Preferably, closed first passage, the first passage and the drilling are additionally provided in the plugging block
Inside is connected, and when injecting liquid into the drilling, the liquid flows into the drilling along the first passage.
By the way that closed first passage is arranged in plugging block, when injecting liquid into drilling, first is led to first
Road is adjusted to opening-wide state, and liquid passes through first passage injection hole.When the liquid in drilling fills and has certain pressure
Afterwards, first passage is closed, is can be realized to the liquid in drilling with certain pressure, it is easy to operate.
Preferably, the one end of the first passage far from the drilling is the first connecting pin, is set on first connecting pin
It is equipped with first pipe, the first valve is provided in the first pipe, first valve is for controlling the first pipe
On off operating mode, is additionally provided with second channel in the plugging block, and the one end of the second channel far from the drilling is second to connect
End is connect, second pipe is provided in the second connection end, pressure gauge and the second valve are provided on the second pipe, it is described
Second valve is used to control the on off operating mode of the second pipe, and the pressure gauge is used to measure the pressure of the liquid.
During testing repeatedly, it was discovered by researchers that when the fluid pressure difference of bore inner, high power pulse
The effect of the shock wave fracturing coal sample generated after breakdown liquid is not also identical, by the way that second pipe is arranged in second connection end,
And pressure gauge is set on second pipe, the pressure of liquid has been measured, has been punctured by the liquid to different pressures, so as to
Enough determine that the shock wave generated after being punctured when why fluid pressure is worth by high power pulse is best to the fracturing effect of coal sample.Pass through
Two valves are set on second pipe, while first pipe is set, and the first valve is set in first pipe, are easily facilitated pair
Liquid is injected in drilling.
Preferably, the three axis compression system includes closed pressure chamber, and the pressure chamber is used to accommodate the coal sample,
The direction x of the pressure chamber, the direction y, the direction z side wall on be respectively arranged with the second through-hole, slide and set on second through-hole
It is equipped with sliding shoe, sliding shoe one end corresponding with the inside of the pressure chamber is pressure side, the end of the pressure side
It is press fit between the coal sample.
In above-mentioned preferred embodiment, the three axis compression system includes closed pressure chamber.When experiment, coal sample is placed in
In pressure chamber, and confining pressure room, by pushing sliding shoe to oppress the pressure side end of sliding shoe to coal sample, Ji Keshi
Triaxial pressure now is applied to coal sample, it is easy to operate.
Preferably, the three axis compression system further includes hydraulic cylinder, the hydraulic cylinder it is opposite with the sliding shoe
It answers, is linked between the hydraulic cylinder and the sliding shoe.
In above-mentioned preferred embodiment, by the way that hydraulic cylinder is arranged, and keep hydraulic cylinder corresponding with sliding shoe, in hydraulic cylinder
It is linked down between sliding shoe, when hydraulic cylinder being made to stretch, hydraulic cylinder pushes or pull on sliding shoe sliding, makes sliding shoe
Compressing coal sample is separated with coal sample, thus when applying triaxial pressure to coal sample, it is more convenient.
Preferably, the sliding shoe is made of insulating material.
Preferably, one of them in the sliding shoe is connection sliding shoe, and the coal sample deviates from the connection sliding shoe
One end be the first corresponding end, link block is set in first corresponding end, one end of the link block passes through the pressure chamber,
The outside of the pressure chamber is extended to, closed third through-hole is provided on the link block, is arranged on the connection sliding shoe
There is closed third channel, the gas injected system is connected with the third through-hole, makes the gas of injection through described the
Three through-holes flow into the pressure chamber, then flow out the pressure chamber through the third channel.
Preferably, fourth hole is additionally provided on the link block, the fourth hole is corresponding with the drilling, described
The inner wall of fourth hole and the outer wall of the plugging block match.
Preferably, the gas injected system includes pressure bottle, and gas is stored in the pressure bottle, and the pressure bottle is logical
Third pipeline is crossed to be connected with the third through-hole.
It preferably, is removably to connect between the third pipeline and the third through-hole.
Preferably, it is provided with the 4th pipeline on the third channel, flowmeter, the stream are provided on the 4th pipeline
Meter is matched with the 4th pipeline, is measured to the gas for flowing through the third channel.
During experiment, experimenter's discovery, after carrying out fracturing to coal body using high power pulse, gas can be passed through
Coal body, and the outside for being connected to sliding shoe is flowed to along third channel.When the fracturing effect of coal sample is better, the flow of Gas Flow
It is bigger.In above-mentioned preferred embodiment, by the way that the 4th pipeline is arranged on third channel, and flowmeter is set on the 4th pipeline, it is right
The gas for flowing through third channel is measured, so that passing through different groups of the corresponding stream of coal sample of comparison after the completion of to coal sample fracturing
The uninterrupted that meter is shown can determine that the fracturing effect of which group coal sample is best.It is entire to determine that coal sample internal penetration rate is big
Small process is not necessarily to the cooperation of other instruments, has not only saved experimental cost, and very convenient.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further include Rogowski coil and
Oscillograph, the Rogowski coil are arranged on the conducting wire, pass through data line phase between the Rogowski coil and the oscillograph
Connection.
During testing repeatedly, it was discovered by researchers that being hit with the pulse current of different discharge types to liquid
When wearing, the intensity of the shock wave generated after liquid breakdown is also different, so that the fracturing effect to coal sample is also different.In order to ensure right
The effect of the fracturing of coal body is best, therefore determines when discharging in what manner in advance, the shock wave generated after liquid breakdown it is strong
Degree is maximum.Under different discharge types, current waveform corresponding to the pulse current of generation is all different.
In above-mentioned preferred embodiment, pass through installation Rogowski coil and oscillograph, under the cooperation of Rogowski coil and oscillograph, energy
Current waveform corresponding to different pulse currents is enough measured, by comparing under different waveforms, the fracturing effect of coal sample can be true
It is best to the fracturing effect of coal body when determining to puncture liquid with the pulse current of which kind of waveform.Adjust high power pulse machine
The discharge type of structure, being allowed to waveform corresponding to the pulse current generated is specific waveform, can be real using existing mode
It is existing.Therefore, when obtaining to coal sample fracturing effect preferably after the current waveform of pulse current, by adjusting putting for high power pulse
It is best that the effect for carrying out fracturing to coal body can be realized in electric form.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes support tube, institute
It states support tube to be made of hard material, several fifth holes is provided on the support tube, the support tube is arranged in the brill
In hole, the outer wall of the support tube and the inner wall of the drilling fit.
Compared with prior art, the invention has the benefit that it is required when can determine preferable to coal body fracturing effect
Pulse energy, shock wave characteristic, the damage and failure rule of shock wave coal body are studied, to different wave and energy
Shock wave fracturing coal body rule carries out numerical Analysis, while can analyze under compared with high confining pressure and high methane pressure containing gas
Sound emission temporal and spatial evolution in coal rupture process inquires into influence of the gas pressure to characteristics of Acoustic Emission.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention；
Fig. 2 is the partial enlarged view in Fig. 1 at A；
Fig. 3 is that coal sample of the present invention is placed on the indoor cross-sectional view of pressure；
Fig. 4 is the partial enlarged view in Fig. 3 at B；
Fig. 5 is the cross-sectional view of link block of the present invention；
Fig. 6 is the cross-sectional view of pressure chamber of the present invention；
Fig. 7 is the cross-sectional view in the other directions of pressure chamber of the present invention；
Fig. 8 is the cross-sectional view of plugging block of the present invention,
Marked in the figure: 1- shock-wave detection mechanism, 2- coal sample, 3- drilling, 4- acoustic emission detection mechanism, the inspection of 5- gas pressure
Mechanism, 6- high power pulsed source are surveyed, 7- high power pulse switchs, 8- high power pulse capacitor, the first conducting wire of 9- segment,
The second conducting wire of 10- segment, 11- privates segment, 12- plugging block, 13- connecting rod, 14- first pipe, the first valve of 15-,
16- second pipe, 17- pressure gauge, the second valve of 18-, the pressure chamber 19-, 20- sliding shoe, 21- hydraulic cylinder, 22- link block,
23- pressure bottle, 24- third pipeline, the 4th pipeline of 25-, 26- Rogowski coil, 27- oscillograph, 28- discharger, 29- support tube,
121- first through hole, 122- first passage, 123- second channel, the second through-hole of 191-, 201- third channel, 221- third are logical
Hole, 222- fourth hole, 291- fifth hole.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Embodiment 1
A kind of experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method, including high power pulse generating mechanism
With shock-wave detection mechanism 1, drilling 3 is preset in coal sample 2, the liquid of certain pressure, the high power are marked in the drilling 3
Impulse mechanism is connected by conducting wire with the drilling 3, when the high power pulse generating mechanism being made to work, the Gao Gong
Liquid propellant high power pulse of the rate impulse mechanism into the drilling 3, forms shock wave, fracturing institute in the liquid
Coal sample 2 is stated, the shock-wave detection mechanism 1 is matched with the coal sample 2, is detected and is analyzed the impact baud in the coal sample 2
Sign.
The high power pulse of the application refers to pulse power in the pulse of 10KW or more.Shock wave inspection in above scheme
Surveying mechanism 1 can be selected shock-wave detection instrument common on the market.Liquid in above scheme can be selected water or other it is existing can
By the energetic material of electric initiation.In above scheme, certain pressure is injected by drilling preset in coal sample 2, and into drilling 3
Liquid, when high power pulse generating mechanism work when, liquid propellant high power of the high power pulse generating mechanism into drilling
Pulse forms shock wave, fracturing coal sample 2 in a liquid.In this manner to coal sample 2 carry out fracturing fracturing effect compared with
It is good.
Need to produce the identical coal sample 2 of multiple groups according to experiment before experiment starts.When experiment, by shock-wave detection mechanism
Multiple sensors be embedded in coal sample 2 inside different location, then enable high power pulse generating mechanism with different pulses
The high power pulse of amount punctures the liquid filled in the drilling 3 of different groups of coal sample 2, and liquid is made to generate shock wave to coal
Sample 2 carries out fracturing, and records pulse energy corresponding to each group coal sample 2 one by one.The failure mode of coal sample 2 can be divided into tension destruction
And Compressive failure, the destruction near drilling 3 is usually Compressive failure.The tensile strength of coal sample 2 is less than its compression strength, with
Shock wave is propagated in coal sample 2, and the damage capability of shock wave is gradually reduced, when the resistance to compression that can not cause coal sample 2 of shock wave is broken
Bad when, the failure mode of coal sample 2 are changed into tension destruction.Shock-wave detection mechanism divides collected shockwave signal
Analysis, can know that different zones are by the form destroyed in coal sample, while shock-wave detection mechanism believes collected shock wave
Number position analyzed, so as to obtain the size in coal sample 2 by the region destroyed.By comparing different groups of coal samples 2
The interior size by the region destroyed can determine the maximum one group of coal sample in internal sabotage region.By inquiring 2 institute of this group of coal sample
Corresponding pulse energy can determine pulse energy required when keeping 2 fracturing effect of coal sample preferable, to solve using Gao Gong
When rate pulse fracturing coal body, when how to determine preferable to 2 fracturing effect of coal sample the problem of required pulse energy.
Need to produce the identical coal sample 2 of multiple groups according to experiment before experiment starts.When experiment, by shock-wave detection mechanism
1 sensor is fitted in the surface of coal sample 2, then makes high power pulse generating mechanism with the high power pulse of different pulse energies
The liquid filled in the drilling 3 of different groups of coal sample 2 is punctured, so that liquid is generated shock wave and fracturing is carried out to coal sample 2, and
Pulse energy corresponding to each group coal sample 2 is recorded one by one.Shock-wave detection mechanism 1 analyzes collected shockwave signal
Level of breakage inside coal sample that you can get it 2, so that it is determined that the maximum one group of coal sample 2 of interior porosity.By inquiring this group of coal
Pulse energy corresponding to sample 2 can determine pulse energy required when keeping coal body fracturing effect preferable, to solve use
When high power pulse fracturing coal body, when how to determine preferable to coal body fracturing effect the problem of required pulse energy.
During using high power pulse fracturing coal body, it was discovered by researchers that using the high power of identical pulse energy
During the same coal body of pulse pair carries out fracturing, when carrying out the frequency difference of fracturing to same coal body, i.e., in certain time
When the interior number difference for carrying out fracturing to same coal body, the fracturing effect of coal body is not also identical.In order to ensure the coal body after fracturing
With preferable permeability, which kind of frequency is selected to carry out fracturing to coal body for this reason, it may be necessary to determine in advance.
It is tested using the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method described in above scheme
When, it keeps selecting different pulse energies to be tested in the identical situation of frequency to coal body progress fracturing, determining and cause first
Split effect it is good when required pulse energy；Then in the case where keeping the pulse energy of high power pulse constant, using different
Frequency carries out fracturing to different groups of coal sample 2.It after the completion of fracturing, is detected, is determined by the inside of the coal sample 2 to different groups
The maximum one group of coal sample 2 of porosity can determine that the fracturing effect of coal sample 2 is good when which kind of frequency to carry out fracturing to coal sample 2 with.
In above scheme, the shockwave signal in coal sample 2 is detected and divided using shock-wave detection mechanism 1
Analysis, thus researcher can be realized the failure mechanism of the generation to high power pulse shock wave, the mechanism of transmission and coal sample 2 into
Row analysis, while can also realize the experimental study of shock wave characteristic, 2 rule of shock wave fracturing coal sample, and to different wave
Energy impact wave fracturing rule carries out numerical Analysis.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes acoustic emission detection
Mechanism 4, the acoustic emission detection mechanism 4 are matched with the coal sample 2, are detected and are analyzed the characteristics of Acoustic Emission in the coal sample 2.
Acoustic emission detector common on the market can be selected in acoustic emission detection mechanism 4 in above-mentioned preferred embodiment.When experiment,
The sensor of acoustic emission detection mechanism 4 is fitted in the surface of coal sample 2, subsequent high power pulse generating mechanism emits high power arteries and veins
Punching carries out fracturing to coal sample 2, and the different zones in coal sample 2 gradually rupture, and generate acoustic emission signal, acoustic emission detection machine
Structure 4 detects the acoustic emission signal generated when different zones rupture, and records the sequencing of the acoustic emission signal detected.To coal
After the completion of 2 fracturing of sample, acoustic emission detection mechanism analyzes collected acoustic emission signal, and is built using computer
Mould can clearly reflect that 2 different zones of coal sample generate the dynamic process destroyed on computers.By to sound emission and impact
Wave is analyzed jointly, can more accurately obtain the rupture range inside coal sample 2.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes three axis compression trains
System, the three axis compression system are matched with the coal sample 2, apply triaxial pressure to the coal sample 2.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes gas injection system
System, the gas injected system are matched with the coal sample 2, when the gas injected system being made to work, gas injection system
It unites and injects gas to the inside of the coal sample 2.
Coal resource is one of China's main energy sources, with the development of economy, is gradually changed to deep to the exploitation of coal resource.
The features such as high-ground stress, high methane possessed by deep fractures and low-permeability, has seriously affected the safe working of coal.Therefore,
Carry out coal seam containing gas under complex stress, especially compared with the Acoustic emission under high confining pressure and high methane pressure, to taking off
Show the spatial-temporal distribution characteristic of deep high methane coal and rock micro rupture test specimen under different ambient stresses, ensures deep high gas layer peace
Standard-sized sheet, which is adopted, to be of great significance.
The experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method described in above-mentioned preferred embodiment further includes
Three axis compression systems and gas injected system, when experiment, three axis compression systems apply triaxial pressure to coal sample 2, simulate deep coal
The high-ground stress that layer is subject to, gas injected system inject gas, high methane pressure existing for simulation coal petrography inside to the inside of coal sample 2
Power.During experiment, acoustic emission detection mechanism 4 is acquired and analyzes to the acoustic emission signal inside coal body, energy
Sound emission space distribution rule is accessed, so that researcher can analyze the coal containing methane gas under compared with high confining pressure and high methane pressure
Sound emission temporal and spatial evolution in rupture process inquires into influence of the gas pressure to characteristics of Acoustic Emission.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes gas pressure inspection
Mechanism 5 is surveyed, the gas pressure detection mechanism 5 is matched with the coal sample 2, detects the gas pressure in the coal sample 2.
High pulse power technology acts on influence of the anatonosis effect in coal seam by the coal seam atmospheric pressure in coal seam, that is, works as coal
Layer in coal seam atmospheric pressure difference when, using identical pulse energy high power pulse to coal body carry out fracturing fracturing effect simultaneously
It is not identical.In above-mentioned preferred embodiment, by the way that gas pressure detection mechanism 5 is arranged, the inspection to 2 inside gas pressure of coal sample is realized
It surveys, so as to clearly obtain coal sample 2 under what gas pressure, the fracturing effect by high power pulse is best.
Preferably, the high power pulse generating mechanism include high power pulsed source 6, high power pulse switch 7 and
High power pulse capacitor 8, the conducting wire include the first conducting wire segment 9, the second conducting wire segment 10 and privates segment 11, institute
It states and is connected between high power pulsed source 6 and the high power pulse capacitor 8 by first conducting wire segment 9, it is described
One end of second conducting wire segment 10 is connected with the anode of the high power pulse capacitor 8, and the other end protrudes into the drilling,
One end of the privates segment 11 is connected with the cathode of the high power pulse capacitor 8, and the other end protrudes into the brill
In hole, the high power pulse switch 7 is arranged on second conducting wire segment 10 or the privates segment 11, controls institute
State the on off operating mode of circuit between high power pulse capacitor 8 and the coal sample 2.
In above-mentioned preferred embodiment, high power pulse generating mechanism includes high power pulsed source 6, high power pulse switch 7
And high power pulse capacitor 8, pass through the first conducting wire segment 9 between high power pulsed source 6 and high power pulse capacitor 8
It is connected, one end of the second conducting wire segment 10 is connected with the anode of high power pulse capacitor 8, and the other end protrudes into drilling,
One end of privates segment 11 is connected with the cathode of high power pulse capacitor 8, and the other end protrudes into drilling, high power arteries and veins
Pass 7 is washed open to be arranged on the second conducting wire segment 10 or privates segment 11.In use, high power pulse switch 7 is disconnected first,
And high power pulsed source 6 is made to charge high power pulse capacitor 8, just by measurement high power pulse capacitor 8
Voltage between pole and cathode can calculate the pulse energy stored in high power pulse capacitor 8.When to high power pulse
When the electricity that capacitor 8 is filled with meets requirement of experiment, high power pulsed source 6 is made to stop charging to high power pulse capacitor 8,
Then high power pulse switch 7 is closed, high power pulse capacitor 8 discharges the high-voltage pulse of certain pulses energy at this time,
Shock wave is generated in liquid, and fracturing is carried out to coal sample 2.Meanwhile by high power pulsed source 6 in control certain time to Gao Gong
The number of number and high power pulse switch 7 closure of the charging of rate impulse capacitor 8, can be realized with specific frequency
Fracturing is carried out to coal sample 2.
It is carried out using the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method described in above-mentioned preferred embodiment
Experiment is not only able to be realized more conveniently with the high power pulse of certain pulses energy to the progress fracturing of coal sample 2, and can also
Enough realize more conveniently carries out fracturing to coal sample 2 with specific frequency.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes 12 He of plugging block
Connecting rod 13, the plugging block 12 is for blocking the drilling 3, and the connecting rod 13 is made of hard material, the connecting rod
13 one end is discharge end, and discharger 28, anode and second conducting wire of the discharger 28 are provided on the discharge end
Segment 10 is connected, and the cathode of the discharger 28 is connected with the privates segment 11, is arranged in the plugging block 12
There is first through hole 121, the inner wall of the first through hole 121 and the outer wall of the connecting rod 13 match, and the discharge end passes through
The first through hole 121 extends to the inside of the drilling 3.
Discharger 28 common on the market can be selected in discharger 28 described in above-mentioned preferred embodiment.By the way that plugging block is arranged
12, it avoids high power pulse liquid after the liquid in breakdown drilling 3 and is sprayed from the opening of drilling 3 and weaken shock wave,
It can be realized the liquid that certain pressure is injected into drilling simultaneously.During experiment, in order to make the effect of fracturing coal sample 2 compared with
It is good, it usually needs the end of the end of the second conducting wire segment 10 and privates segment 11 is extend into as much as possible in drilling 3,
It is necessary to ensure that the spacing between 11 end of 10 end of the second conducting wire segment and privates segment meets electric discharge and requires simultaneously.So
And the material of most conducting wire is softer, therefore the first conducting wire segment 9 and the second conducting wire segment 10 are passed through first through hole
The operation that 3 bottoms of drilling are extend into after 121 is more difficult, while passing through first in the first conducting wire segment 9 and the second conducting wire segment 10
After through-hole 121, the spacing between the end of the first conducting wire segment 9 and the end of the second conducting wire segment 10 is difficult to ensure.By adopting
Connecting rod 13 is made with hard material, discharger 28 is set on the discharge end of connecting rod 13, while making the anode of discharger 28
It is connected with the second conducting wire segment 10, the cathode of discharger 28 is made to be connected with privates segment 11, makes first through hole 121
Inner wall and the outer wall of connecting rod 13 match, and discharge end is passed through first through hole 121 when experiment and is extended back to the inside of drilling 3, really
The end of the end and privates segment 11 of having protected the second conducting wire segment 10 can be extend into as much as possible in drilling 3, simultaneously
Provided with discharger 28, it is ensured that the spacing between 11 end of 10 end of the second conducting wire segment and privates segment meets electric discharge
It is required that.
Preferably, closed first passage 122, the first passage 122 and institute are additionally provided in the plugging block 12
The inside for stating drilling 3 is connected, and when injecting liquid into the drilling 3, the liquid flows into described along the first passage 122
Drilling 3.
By the way that closed first passage 122 is arranged in plugging block 12, when injecting liquid into drilling 3, first will
First passage 122 is adjusted to opening-wide state, and liquid passes through 122 injection hole 3 of first passage.When drilling 3 in liquid fill and
After certain pressure, first passage 122 is closed, can be realized to the liquid in drilling 3 with certain pressure, operation ten
It is convenient to divide.
Preferably, the one end of the first passage 122 far from the drilling 3 is the first connecting pin, first connecting pin
On be provided with first pipe 14, be provided with the first valve 15 in the first pipe 14, first valve 15 is for controlling institute
The on off operating mode of first pipe 14 is stated, second channel 123 is additionally provided in the plugging block 12, the second channel 123 is separate
One end of the drilling 3 is second connection end, is provided with second pipe 16 in the second connection end, on the second pipe 16
It is provided with pressure gauge 17 and the second valve 18, second valve 18 is used to control the on off operating mode of the second pipe 16, institute
Pressure gauge 17 is stated for measuring the pressure of the liquid.
Repeatedly test during, it was discovered by researchers that when drill 3 inside fluid pressure difference when, high power arteries and veins
The effect that the shock wave fracturing coal sample 2 generated after liquid is worn in impact is not also identical, by the way that the second pipe is arranged in second connection end
Road 16, and pressure gauge 17 is set on second pipe 16, the pressure of liquid has been measured, has been hit by the liquid to different pressures
It wears, the shock wave generated after being punctured when why being worth so as to determining fluid pressure by high power pulse imitates the fracturing of coal sample 2
Fruit is best.By the way that two valves are arranged on second pipe 16, while first pipe 14 is set, and is arranged in first pipe 14
One valve 15 easily facilitates and injects liquid in drilling 3.
Preferably, the three axis compression system includes closed pressure chamber 19, and the pressure chamber 19 is described for accommodating
Coal sample 2, the direction x of the pressure chamber 19, the direction y, the direction z side wall on be respectively arranged with the second through-hole 191, described second is logical
Sliding is provided with sliding shoe 20 on hole 191, and the sliding shoe 20 one end corresponding with the inside of the pressure chamber 19 is compressing
End is press fit between the end of the pressure side and the coal sample 2.
In above-mentioned preferred embodiment, the three axis compression system includes closed pressure chamber 19.When experiment, coal sample 2 is put
Be placed in pressure chamber 19, and confining pressure room 19, by push sliding shoe 20 make the pressure side end of sliding shoe 20 to coal sample 2 into
Row compressing can be realized and apply triaxial pressure to coal sample 2, easy to operate.
Preferably, the three axis compression system further includes hydraulic cylinder 21, the hydraulic cylinder 21 with the sliding shoe
20 is corresponding, is linked between the hydraulic cylinder 21 and the sliding shoe 20.
In above-mentioned preferred embodiment, by the way that hydraulic cylinder 21 is arranged, and keep hydraulic cylinder 21 corresponding with sliding shoe 20, in liquid
It is linked down between compressing cylinder 21 and sliding shoe 20, when hydraulic cylinder 21 being made to stretch, hydraulic cylinder 21 pushes or pull on sliding
Block 20 slides, and sliding shoe 20 is made to oppress coal sample 2 or separate with coal sample 2, thus when applying triaxial pressure to coal sample 2, more just
Just.
Preferably, the sliding shoe 20 is made of insulating material.
Preferably, one of them in the sliding shoe 20 is connection sliding shoe, and the coal sample 2 is slided away from the connection
One end of block is the first corresponding end, and link block 22 is arranged in first corresponding end, and one end of the link block 22 passes through described
Pressure chamber 19 extends to the outside of the pressure chamber 19, and closed third through-hole 221 is provided on the link block 22, described
It is provided with closed third channel 201 on connection sliding shoe, the gas injected system is connected with the third through-hole 221
It is logical, so that the gas of injection is flowed into the pressure chamber 19 through the third through-hole 221, then flow out through the third channel 201 described
Pressure chamber 19.
Preferably, fourth hole 222, the fourth hole 222 and 3 phases of the drilling are additionally provided on the link block 22
Corresponding, the inner wall of the fourth hole 222 and the outer wall of the plugging block 12 match.
Preferably, the gas injected system includes pressure bottle 23, and gas, the pressure are stored in the pressure bottle 23
Bottle 23 is connected by third pipeline 24 with the third through-hole 221.
It preferably, is removably to connect between the third pipeline 24 and the third through-hole 221.
Preferably, it is provided with the 4th pipeline 25 on the third channel 201, is provided with flow on the 4th pipeline 25
Meter, the flowmeter are matched with the 4th pipeline 25, are measured to the gas for flowing through the third channel 201.
During experiment, experimenter's discovery, after carrying out fracturing to coal body using high power pulse, gas can be passed through
Coal body, and the outside for being connected to sliding shoe is flowed to along third channel 201.When the fracturing effect of coal sample 2 is better, Gas Flow
Flow is bigger.In above-mentioned preferred embodiment, by the way that the 4th pipeline 25 is arranged on third channel 201, and set on the 4th pipeline 25
Flowmeter is set, the gas for flowing through third channel 201 is measured, so that passing through different groups of comparison after the completion of to 2 fracturing of coal sample
The uninterrupted that shows of the corresponding flowmeter of coal sample 2, that is, can determine that the fracturing effect of which group coal sample 2 is best.It is entire to determine
The process of 2 internal penetration rate size of coal sample is not necessarily to the cooperation of other instruments, has not only saved experimental cost, and very convenient.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes Rogowski coil 26
With oscillograph 27, the Rogowski coil 26 is arranged on the conducting wire, leads between the Rogowski coil 26 and the oscillograph 27
Data line is crossed to be connected.
During testing repeatedly, it was discovered by researchers that being hit with the pulse current of different discharge types to liquid
When wearing, the intensity of the shock wave generated after liquid breakdown is also different, so that the fracturing effect to coal sample 2 is also different.In order to ensure
It is best to the effect of the fracturing of coal body, therefore determine when discharging in what manner in advance, the shock wave generated after liquid breakdown
Maximum intensity.Under different discharge types, current waveform corresponding to the pulse current of generation is all different.
In above-mentioned preferred embodiment, by installation Rogowski coil 26 and oscillograph 27, in Rogowski coil 26 and oscillograph 27
Under cooperation, current waveform corresponding to different pulse currents can be measured, by comparing under different waveforms, the fracturing of coal sample 2
Effect can determine when being punctured with the pulse current of which kind of waveform to liquid, best to the fracturing effect of coal body.It adjusts high
The discharge type of power pulse mechanism, being allowed to waveform corresponding to the pulse current generated is specific waveform, and use is existing
Mode can be realized.Therefore, high by adjusting when obtaining to 2 fracturing effect of coal sample preferably after the current waveform of pulse current
It is best that the effect for carrying out fracturing to coal body can be realized in the discharge type of power pulse.
Preferably, the experimental provision of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes support tube 29,
The support tube 29 is made of hard material, and several fifth holes 291 are provided on the support tube 29, and the support tube 29 is set
It sets in the drilling 3, the outer wall of the support tube 29 and the inner wall of the drilling 3 fit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method, it is characterised in that: including high power arteries and veins
Generating mechanism and shock-wave detection mechanism (1) are rushed, is preset in coal sample (2) drilling (3), is marked with a level pressure in the drilling (3)
The liquid of power, the high power pulse generating mechanism are connected by conducting wire with the drilling (3), and the high power pulse is sent out
When life structure works, liquid propellant high power pulse of the high power pulse generating mechanism into the drilling (3), described
Shock wave, coal sample described in fracturing (2) are formed in liquid, the shock-wave detection mechanism (1) matches with the coal sample (2), inspection
It surveys and analyzes the impact wave characteristic in the coal sample (2).
2. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 1, feature exist
In: it further include acoustic emission detection mechanism (4), the acoustic emission detection mechanism (4) matches with the coal sample (2), detects and divides
Analyse the characteristics of Acoustic Emission in the coal sample (2).
3. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 2, feature exist
In: it further include three axis compression systems, the three axis compression system is matched with the coal sample (2), applies three to the coal sample (2)
Axis pressure.
4. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 3, feature exist
In: it further include gas injected system, the gas injected system is matched with the coal sample (2), makes the gas injected system
When work, the gas injected system injects gas to the inside of the coal sample (2).
5. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 4, feature exist
In: it further include gas pressure detection mechanism (5), the gas pressure detection mechanism (5) matches with the coal sample (2), detection
Gas pressure in the coal sample (2).
6. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 5, feature exist
In: the high power pulse generating mechanism includes high power pulsed source (6), high power pulse switch (7) and high power arteries and veins
It rushes capacitor (8), the conducting wire includes the first conducting wire segment (9), the second conducting wire segment (10) and privates segment (11), institute
It states and is connected between high power pulsed source (6) and the high power pulse capacitor (8) by first conducting wire segment (9)
It connects, one end of second conducting wire segment (10) is connected with the anode of the high power pulse capacitor (8), and the other end protrudes into
In the drilling (3), one end of the privates segment (11) is connected with the cathode of the high power pulse capacitor (8)
Connect, the other end protrudes into the drilling (3), high power pulse switch (7) setting in second conducting wire segment (10) or
On the privates segment (11), the on-off of circuit between the high power pulse capacitor (8) and the coal sample (2) is controlled
State.
7. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 6, feature exist
In: it further include plugging block (12) and connecting rod (13), the plugging block (12) is for blocking the drilling (3), the connecting rod
(13) it being made of hard material, one end of the connecting rod (13) is discharge end, discharger (28) are provided on the discharge end,
The anode of the discharger (28) is connected with second conducting wire segment (10), the cathode of the discharger (28) and described the
Three wires segment (11) is connected, and is provided with first through hole (121) on the plugging block (12), the first through hole (121)
Inner wall and the outer wall of the connecting rod (13) match, and the discharge end passes through the first through hole (121) and extends to the drilling
(3) inside.
8. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 7, feature exist
In: it is additionally provided with closed first passage (122) on the plugging block (12), the first passage (122) and the drilling
(3) inside is connected, and into the drilling (3) when injection liquid, the liquid is along described in the first passage (122) inflow
It drills (3).
9. the experimental provision of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 8, feature exist
In: the three axis compression system includes closed pressure chamber (19), and the pressure chamber (19) is used to accommodate the coal sample (2),
The direction x of the pressure chamber (19), the direction y, the direction z side wall on be respectively arranged with the second through-hole (191), second through-hole
(191) sliding is provided with sliding shoe (20) on, the sliding shoe (20) one end corresponding with the inside of the pressure chamber (19)
It is press fit between the end of the pressure side and the coal sample (2) for pressure side.
10. the experiment of the controllable shock wave fracturing coal seam with gas of multi- scenarios method as claimed in any of claims 1 to 9
Device, it is characterised in that: further include Rogowski coil (26) and oscillograph (27), the Rogowski coil (26) is arranged in the conducting wire
On, it is connected between the Rogowski coil (26) and the oscillograph (27) by data line.
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| CN112268818A (en) * | 2020-11-11 | 2021-01-26 | 中国科学院地质与地球物理研究所 | Rock true triaxial controllable shock wave fracturing test system and method |
| CN112943371A (en) * | 2021-01-25 | 2021-06-11 | 华能煤炭技术研究有限公司 | Coal seam permeability increasing evaluation system with controllable shock waves |
| CN113418852A (en) * | 2021-06-22 | 2021-09-21 | 西安科技大学 | Ultrasonic pulse fracturing gas-containing coal body seepage experimental device and method |
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