CN109323974A - A kind of experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method - Google Patents
A kind of experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method Download PDFInfo
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- 238000002474 experimental method Methods 0.000 title claims abstract description 64
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- 238000005553 drilling Methods 0.000 claims abstract description 83
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- 238000002347 injection Methods 0.000 claims description 5
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- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 9
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- 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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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Abstract
The present invention relates to coal bed gas (mine gas) production technique fields, the experimental method of especially a kind of controllable shock wave fracturing coal seam with gas of multi- scenarios method, including step a: the liquid of certain pressure is injected in production coal sample, the preset drilling in the coal sample into the drilling；Step b: high power pulse generating mechanism is connected by installation high power pulse generating mechanism using conducting wire with the drilling；Step c: installation shock-wave detection mechanism；Step d: make liquid propellant high power pulse of the high power pulse generating mechanism into the drilling, form shock wave, coal sample described in fracturing in the liquid；Step e: being detected using the shock-wave detection mechanism 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 method 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
Method.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method, including
Step a: the liquid of certain pressure is injected in production coal sample, the preset drilling in the coal sample into the drilling；
Step b: installation high power pulse generating mechanism, using conducting wire by high power pulse generating mechanism and the drilling phase
Connection；
Step c: installation shock-wave detection mechanism；
Step d: make liquid propellant high power pulse of the high power pulse generating mechanism into the drilling, described
Shock wave, coal sample described in fracturing are formed in liquid；
Step e: being detected using the shock-wave detection mechanism and analyzes 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 method 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step f: installation acoustic emission detection mechanism, it is special to the sound emission in the coal sample using the acoustic emission detection mechanism
Sign is detected and analyzed.
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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step g: three axis compression systems of installation apply triaxial pressure to the coal sample using the three axis compression system.
Preferably, the experimental method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step h: installation gas injected system injects gas to the inside of the coal sample using the gas injected system.
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 method 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step i: installation gas pressure detection mechanism, using the gas pressure detection mechanism to the gas in the coal sample
Pressure is detected.
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, in the step b, installation high power pulse generating mechanism includes
Step b1: installation high power pulsed source, high power pulse switch and high power pulse capacitor；The conducting wire
Including the first conducting wire segment, the second conducting wire segment and privates segment,
Step b2: using first conducting wire segment to the high power pulsed source and the high power pulse capacitor
It is attached, one end of second conducting wire segment is connected with the anode of the high power pulse capacitor, the other end is stretched
Enter in the drilling, one end of the privates segment is connected with the cathode of the high power pulse capacitor, it is another
End is protruded into the drilling；
Step b3: high power pulse switch is arranged in second conducting wire segment or the privates segment
On, for controlling the on off operating mode of circuit between the high power pulse capacitor and the 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 method 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step j: first through hole is arranged in the plugging block, using the plugging block to the drilling in production plugging block
It is blocked；
Step k: it selects hard material to make connecting rod, makes inner wall phase of the outer wall of the connecting rod with the first through hole
One end of matching, the connecting rod is discharge end, discharger is installed on the discharge end, by the anode of the discharger and institute
It states the second conducting wire segment to be connected, the cathode of the discharger is connected with the privates segment,
Step l: the discharge end of the connecting rod is passed through into 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, in the step j, production plugging block further includes
Step j1: being also provided with closed first passage in the plugging block, makes the first passage and the brill
The inside in hole is connected；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, in the step j, production envelope
Sprue further includes
Step j2: first pipe is installed on first connecting pin；
Step j3: being arranged second channel in the plugging block, and the one end of the second channel far from the drilling is the
Second pipe is installed in the second connection end in two connecting pins；
Step j4: the first valve for controlling the first pipe on off operating mode is installed in the first pipe；
Step j5: the second valve for controlling the second pipe on off operating mode is installed on the second pipe；
Step j6: the pressure gauge for measuring the fluid pressure is installed on the second pipe.
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, in the step g, three axis compression systems of installation include
Step g1: the closed pressure chamber for accommodating the coal sample is made；
Step g2: the direction x of the pressure chamber, the direction y, the direction z side wall on open up the second through-hole respectively；
Step g3: the sliding setting sliding shoe on second through-hole；The inside phase of the sliding shoe and the pressure chamber
Corresponding one end is pressure side, is made between the end of the pressure side and the coal sample for press fit.
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, in the step g, three axis compression systems of installation further include
Step g4: installing hydraulic cylinder on position corresponding with the sliding shoe, make the hydraulic cylinder with it is described
It is to be linked between 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, in the step g, three axis compression systems of installation further include
Step g5: installing link block in first corresponding end, and one end of the link block is made to pass through the pressure chamber,
Extend to the outside of the pressure chamber；
Step g6: offering closed third through-hole on the link block, offers on the connection sliding shoe
Closed third channel；
Step g7: the gas injected system is connected with the third through-hole；Make the gas of injection through the third
Through-hole flows into the pressure chamber, then flows out the pressure chamber through the third channel.
Preferably, in the step g, three axis compression systems of installation further include
Step g8: offering fourth hole on the link block, keeps the fourth hole corresponding with the drilling, makes
The inner wall of the fourth hole and the outer wall of the plugging block match.
Preferably, in the step h, installation gas injected system includes
Step h1: installation is stored with the pressure bottle of gas；
Step h2: the pressure bottle and the third through-hole are attached using third pipeline.
It preferably, is removably to connect between the third pipeline and the third through-hole.
Preferably, in the step h, installation gas injected system further includes
Step h3: installing the 4th pipeline on the third channel, install flowmeter on the 4th pipeline, makes described
Flowmeter 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step m: the Rogowski coil is mounted on the conducting wire, uses data line by installation Rogowski coil and oscillograph
The Rogowski coil and the oscillograph are attached.
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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step n: it selects hard material to make support tube, several fifth holes is opened up on the support tube；
Step o: the support tube is arranged in the drilling, the outer wall of the support tube and the inner wall of the drilling are made
It fits.
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 method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method, including
Step a: the liquid of certain pressure is injected in production coal sample 2, the preset drilling 3 in the coal sample 2 into the drilling 3
Body；
Step b: installation high power pulse generating mechanism, using conducting wire by high power pulse generating mechanism and it is described drilling 3
It is connected；
Step c: installation shock-wave detection mechanism 1；
Step d: make liquid propellant high power pulse of the high power pulse generating mechanism into the drilling 3, in institute
It states and forms shock wave in liquid, coal sample 2 described in fracturing；
Step e: it is detected using the shock-wave detection mechanism 1 and analyzes the impact wave characteristic in the coal sample 2.
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 method 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step f: the sound in the coal sample 2 is sent out using the acoustic emission detection mechanism 4 by installation acoustic emission detection mechanism 4
Feature is penetrated to be detected and analyzed.
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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step g: three axis compression systems of installation apply triaxial pressure to the coal sample 2 using the three axis compression system.
Preferably, the experimental method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step h: installation gas injected system injects gas to the inside of the coal sample 2 using the gas injected system.
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 method 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step i: installation gas pressure detection mechanism 5, using the gas pressure detection mechanism 5 in the coal sample 2
Gas pressure is detected.
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, in the step b, installation high power pulse generating mechanism includes
Step b1: installation high power pulsed source 6, high power pulse switch 7 and high power pulse capacitor 8；It is described
Conducting wire includes the first conducting wire segment 9, the second conducting wire segment 10 and privates segment 11,
Step b2: using first conducting wire segment 9 to the high power pulsed source 6 and the high power pulse capacitor
Device 8 is attached, and one end of second conducting wire segment 10 is connected with the anode of the high power pulse capacitor 8, separately
One end is protruded into the drilling 3, by the cathode phase of one end of the privates segment 11 and the high power pulse capacitor 8
Connection, the other end protrude into the drilling 3；
Step b3: the high power pulse switch 7 is arranged in second conducting wire segment 10 or the privates section
In section 11, for controlling the on off operating mode of circuit between the 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 3,
One end of privates segment 11 is connected with the cathode of high power pulse capacitor 8, and the other end protrudes into drilling 3, high power
Pulse switch 7 is arranged on the second conducting wire segment 10 or privates segment 11.In use, disconnecting high power pulse switch first
7, and high power pulsed source 6 is made to charge high power pulse capacitor 8, pass through measurement high power pulse capacitor 8
Voltage between positive electrode and negative electrode can calculate the pulse energy stored in high power pulse capacitor 8.When to high power arteries and veins
When rushing the electricity that capacitor 8 is filled with and meeting requirement of experiment, fill the stopping of high power pulsed source 6 to high power pulse capacitor 8
High power pulse switch 7 is then closed by electricity, and high power pulse capacitor 8 discharges the high-voltage pulse of certain pulses energy at this time,
Shock wave is generated in a liquid, and fracturing is carried out to coal sample 2.Meanwhile passing through 6 pairs of height of high power pulsed source in control certain time
The number of number and high power pulse switch 7 closure of the charging of power pulse capacitor 8, can be realized with specific frequency
Rate carries out fracturing to coal sample 2.
It is carried out using the experimental method 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step j: first through hole 121 is arranged in production plugging block 12 in the plugging block 12, right using the plugging block 12
The drilling 3 is blocked；
Step k: selecting hard material to make connecting rod 13, makes the outer wall of the connecting rod 13 and the first through hole 121
Inner wall match, one end of the connecting rod 13 is discharge end, discharger 28 is installed on the discharge end, by the electric discharge
The anode of device 28 is connected with second conducting wire segment 10, by the cathode of the discharger 28 and the privates segment 11
It is connected,
Step l: the discharge end of the connecting rod 13 is passed through into the inside that the first through hole 121 extends to 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 and is sprayed from the opening of drilling and weaken shock wave, together
When can be realized to drilling 3 in inject certain pressure liquid.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,
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 foot of hole is 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 and leading to
Behind 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 using
Connecting rod 13 is made in hard material, on the discharge end of connecting rod 13 be arranged discharger 28, while make discharger 28 anode with
Second conducting wire segment 10 is connected, and the cathode of discharger 28 is made to be connected with privates segment 11, makes the interior of first through hole 121
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, it is ensured that
The end of second conducting wire segment 10 and the end of privates segment 11 can be extend into drilling as much as possible, be provided with simultaneously
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 and requires.
Preferably, in the step j, production plugging block 12 further includes
Step j1: being also provided with closed first passage 122 in the plugging block 12, makes the first passage 122
It is connected with the inside of the drilling 3；When injecting liquid into the drilling 3, the liquid is flowed into along the first passage 122
The drilling 3.
By the way that closed first passage 122 is arranged in plugging block 12, when injecting liquid into drilling, first by the
One channel 122 is adjusted to opening-wide state, and liquid passes through 122 injection hole of first passage.When the liquid in drilling fills and has
After certain pressure, first passage 122 is closed, can be realized to the liquid in drilling with certain pressure, operate very square
Just.
Preferably, the one end of the first passage 122 far from the drilling 3 is the first connecting pin, in the step j, system
Making plugging block 12 further includes
Step j2: first pipe 14 is installed on first connecting pin；
Step j3: second channel 123 is set in the plugging block 12, and the second channel 123 is far from the drilling
One end is second connection end, and second pipe 16 is installed in the second connection end；
Step j4: the first valve for controlling 14 on off operating mode of first pipe is installed in the first pipe 14
15；
Step j5: the second valve for controlling 16 on off operating mode of second pipe is installed on the second pipe 16
18；
Step j6: the pressure gauge 17 for measuring the fluid pressure is installed on the second pipe 16.
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, in the step g, three axis compression systems of installation include
Step g1: the closed pressure chamber 19 for accommodating the coal sample 2 is made；
Step g2: the direction x of the pressure chamber 19, the direction y, the direction z side wall on open up the second through-hole 191 respectively；
Step g3: the sliding setting sliding shoe 20 on second through-hole 191；The sliding shoe 20 and the pressure chamber 19
The corresponding one end in inside be pressure side, make between the end of the pressure side and the coal sample 2 for press fit.
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, in the step g, three axis compression systems of installation further include
Step g4: hydraulic cylinder 21 is installed on position corresponding with the sliding shoe 20, makes the hydraulic cylinder 21
It is to be linked between 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 in the step g, three axis compression systems of installation further include
Step g5: installing link block 22 in first corresponding end, and one end of the link block 22 is made to pass through the pressure
Power room 19 extends to the outside of the pressure chamber 19；
Step g6: offering closed third through-hole 221 on the link block 22, opens on the connection sliding shoe
Equipped with closed third channel 201；
Step g7: the gas injected system is connected with the third through-hole 221；Make the gas of injection through described the
Three through-holes 221 flow into the pressure chamber 19, then flow out the pressure chamber 19 through the third channel 201.
Preferably, in the step g, three axis compression systems of installation further include
Step g8: offering fourth hole 222 on the link block 22, makes the fourth hole 222 and the drilling 3
It is corresponding, so that the inner wall of the fourth hole 222 and the outer wall of the plugging block 12 is matched.
Preferably, in the step h, installation gas injected system includes
Step h1: installation is stored with the pressure bottle 23 of gas；
Step h2: the pressure bottle 23 and the third through-hole 221 are attached using third pipeline 24.
It preferably, is removably to connect between the third pipeline 24 and the third through-hole 221.
Preferably, in the step h, installation gas injected system further includes
Step h3: the 4th pipeline 25 is installed on the third channel 201, flow is installed on the 4th pipeline 25
Meter, matches the flowmeter with the 4th pipeline 25, measures 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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step m: the Rogowski coil 26 is mounted on the conducting wire by installation Rogowski coil 26 and oscillograph 27, is used
Data line is attached the Rogowski coil 26 and the oscillograph 27.
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 method of the controllable shock wave fracturing coal seam with gas of the multi- scenarios method further includes
Step n: it selects hard material to make support tube 29, several fifth holes 291 is opened up on the support tube 29；
Step o: by the support tube 29 setting in the drilling 3, make the outer wall of the support tube 29 and the drilling 3
Inner wall 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 method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method, it is characterised in that: including
Step a: production coal sample (2), the preset drilling (3) on the coal sample (2) inject certain pressure into the drilling (3)
Liquid；
Step b: installation high power pulse generating mechanism, using conducting wire by high power pulse generating mechanism and described drilling (3) phase
Connection；
Step c: installation shock-wave detection mechanism (1)；
Step d: make 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；
Step e: it is detected using the shock-wave detection mechanism (1) and analyzes the impact wave characteristic in the coal sample (2).
2. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 1, feature exist
In: further include
Step f: installation acoustic emission detection mechanism (4), using the acoustic emission detection mechanism (4) to the sound in the coal sample (2)
Transmitting feature is detected and analyzed.
3. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 2, feature exist
In: further include
Step g: three axis compression systems of installation apply triaxial pressure to the coal sample (2) using the three axis compression system.
4. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 3, feature exist
In: further include
Step h: installation gas injected system injects gas to the inside of the coal sample (2) using the gas injected system.
5. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 4, feature exist
In: further include
Step i: installation gas pressure detection mechanism (5), using the gas pressure detection mechanism (5) in the coal sample (2)
Gas pressure detected.
6. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 5, feature exist
In: in the step b, installation high power pulse generating mechanism includes
Step b1: installation high power pulsed source (6), high power pulse switch (7) and high power pulse capacitor (8)；Institute
Stating conducting wire includes the first conducting wire segment (9), the second conducting wire segment (10) and privates segment (11),
Step b2: using first conducting wire segment (9) to the high power pulsed source (6) and the high power pulse capacitor
Device (8) is attached, and one end of second conducting wire segment (10) is connected with the anode of the high power pulse capacitor (8)
It connects, the other end protrudes into the drilling (3), by one end of the privates segment (11) and the high power pulse capacitor
(8) cathode is connected, and the other end protrudes into the drilling (3)；
Step b3: high power pulse switch (7) is arranged in second conducting wire segment (10) or the privates section
In section (11), for controlling the on off operating mode of circuit between the high power pulse capacitor (8) and the coal sample (2).
7. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 6, feature exist
In: further include
Step j: production plugging block (12) is arranged first through hole (121) on the plugging block (12), uses the plugging block
(12) drilling (3) is blocked；
Step k: selecting hard material production connecting rod (13), makes the outer wall of the connecting rod (13) and the first through hole
(121) inner wall matches, and one end of the connecting rod (13) is discharge end, installs discharger (28) on the discharge end,
The anode of the discharger (28) is connected with second conducting wire segment (10), by the cathode of the discharger (28) and institute
Privates segment (11) is stated to be connected,
Step l: the discharge end of the connecting rod (13) is passed through into the inside that the first through hole (121) extend to the drilling (3).
8. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 7, feature exist
In: in the step j, production plugging block (12) further includes
Step j1: it is also provided with closed first passage (122) on the plugging block (12), makes the first passage
(122) it is connected with the inside of the drilling (3)；Into the drilling (3) when injection liquid, the liquid is logical along described first
Road (122) flows into the drilling (3).
9. the experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method according to claim 8, feature exist
In: in the step g, three axis compression systems of installation include
Step g1: the closed pressure chamber (19) for accommodating the coal sample (2) is made；
Step g2: the direction x of the pressure chamber (19), the direction y, the direction z side wall on open up the second through-hole (191) respectively；
Step g3: sliding setting sliding shoe (20) on second through-hole (191)；The sliding shoe (20) and the pressure chamber
(19) the corresponding one end in inside is pressure side, is made between the end of the pressure side and the coal sample (2) for press fit.
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
Method, it is characterised in that: further include
Step m: the Rogowski coil (26) is mounted on the conducting wire, makes by installation Rogowski coil (26) and oscillograph (27)
The Rogowski coil (26) and the oscillograph (27) are attached with data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811566380.XA CN109323974A (en) | 2018-12-18 | 2018-12-18 | A kind of experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method |
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| 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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