CN107448184A - It is a kind of that the device and method for improving coal and rock fracturing effect is circulated using high/low temperature - Google Patents
It is a kind of that the device and method for improving coal and rock fracturing effect is circulated using high/low temperature Download PDFInfo
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- CN107448184A CN107448184A CN201710826233.0A CN201710826233A CN107448184A CN 107448184 A CN107448184 A CN 107448184A CN 201710826233 A CN201710826233 A CN 201710826233A CN 107448184 A CN107448184 A CN 107448184A
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- 239000003245 coal Substances 0.000 title claims abstract description 158
- 239000011435 rock Substances 0.000 title claims abstract description 136
- 230000000694 effects Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000523 sample Substances 0.000 claims description 151
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 129
- 238000003825 pressing Methods 0.000 claims description 109
- 238000004826 seaming Methods 0.000 claims description 69
- 229910052757 nitrogen Inorganic materials 0.000 claims description 64
- 239000007788 liquid Substances 0.000 claims description 52
- 238000003780 insertion Methods 0.000 claims description 15
- 230000037431 insertion Effects 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000009834 vaporization Methods 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000306 recurrent effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 10
- QJGQUHMNIGDVPM-OUBTZVSYSA-N nitrogen-15 Chemical compound [15N] QJGQUHMNIGDVPM-OUBTZVSYSA-N 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000005619 thermoelectricity Effects 0.000 description 2
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
It is a kind of that the device and method for improving coal and rock fracturing effect is circulated using high/low temperature, belong to Safety of Coal Mine Production technical field.The device includes refrigerating circulatory device, coal and rock stand under load device, hydraulic system, temperature control system, acoustic emission system and data acquisition processing system.This method is included using said apparatus：Prepare coal and rock sample and assembled, confined pressure is applied to coal and rock sample, collect acoustic emission signal, apply high warm for coal and rock sample to carry, coal and rock sample in hot environment is freezed, signal is gathered, analyzing and processing, obtains fracturing characteristic and crack propagation law under high/low temperature recurrent state on coal and rock.This method realizes the fracturing of coal and rock using high/low temperature temperature jump, and a kind of method referred to is provided to improve gas extraction efficiency.
Description
Technical field
It is more particularly to a kind of to improve coal and rock cause using high/low temperature circulation the invention belongs to Safety of Coal Mine Production technical field
Split the device and method of effect.
Background technology
As China's coal-mine resource exploitation gradually develops to deep, gas bearing capacity gradually increases in coal body, coal body permeability
It can be reduced with desorption of mash gas ability, cause gas drainage under suction difficulty increased dramatically, the coal bed gas accumulated in coal seam has a strong impact on coal
Ore deposit is kept the safety in production.
It is more using conventional methods such as drilling, heat injection, hydraulic fracturings at present in order to reasonably carry out gas drainage under suction.Drilling
Method can improve gas drainage amount to a certain extent by increasing the quantity and density of coal bed drilling；, can using heat injection measure
Strengthen coal body permeance property.The crude oil crack that the method for hydraulic fracturing can be linked up in coal seam, so as to link up the aerogenesis of coal bed gas
Passage, improve methane output.Although above method there can be certain fracturing effect to coal and rock, further reach increase coal
The infiltrative purpose of body, but above method cost is higher, and also have certain restriction to gas extraction efficiency.
The content of the invention
The problem of existing for prior art, the present invention are provided a kind of circulated using high/low temperature and improve coal and rock fracturing effect
Device and method, the coal and rock sample in confined pressure state be heated to a certain pre- by the device by infrared heating device
If temperature, liquid nitrogen then is injected to the coal and rock sample central through-hole in the condition of high temperature, is continuously in coal and rock sample
In the system that colds and heat succeed each other, until destroying.Coal and rock fracture damage signal is collected using acoustic emission system, so as to be closed
In fracturing characteristic and crack propagation law of the coal and rock under high/low temperature recurrent state.The inventive method utilizes high/low temperature temperature
The fracturing of coal and rock is realized in mutation, and a kind of method referred to is provided to improve gas extraction efficiency.
To achieve these goals, the present invention adopts the following technical scheme that：
It is a kind of using high/low temperature circulate improve coal and rock fracturing effect device, including refrigerating circulatory device, coal and rock by
Carry put, hydraulic system, temperature control system, acoustic emission system and data acquisition processing system；
Described refrigerating circulatory device include liquid nitrogen output tank, the first pressure regulator valve, output pressure tank table, nitrogen storage tank,
Second pressure regulator valve, holding vessel pressure gauge and apparatus for producing liquid nitrogen；
Described coal and rock stand under load device includes upper pressing cap, seaming chuck, sample cylinder, lower pressing cap, push-down head and sample cylinder bottom
Seat；
Described hydraulic system includes hydraulic means, confined pressure pressure gauge and confined pressure pressure regulator valve；
Described temperature control system includes infrared hot plate, thermocouple and multichannel temp controlled meter；
Described acoustic emission system includes acoustic emission sensor and sound emission data collecting instrument；
Described data acquisition processing system includes Multichannel data acquisition device and computer；
Upper pressing cap, seaming chuck, sample cylinder, lower pressing cap and the push-down head of coal and rock stand under load device form a closed cavity,
For placing coal and rock sample, lower pressing cap is connected with sample cylinder base, and fixed manufactured effect is played to whole device.
Seaming chuck in coal and rock stand under load device is provided centrally with an insertion aperture, is seaming chuck first through hole, on this
Pressure head first through hole is connected with output pressure tank table, the first pressure regulator valve, liquid nitrogen output tank by pipeline successively；
Another insertion aperture is additionally provided with seaming chuck, is the through hole of seaming chuck second, is provided with seaming chuck lower surface
Acoustic emission sensor and being picked out by wire by the through hole of seaming chuck second is connected with sound emission data collecting instrument；Sound emission data
Acquisition Instrument is connected with the Multichannel data acquisition device of data acquisition processing system；
An insertion aperture is provided with upper pressing cap, is upper pressing cap through hole, the thermocouple being connected with multichannel temp controlled meter
In upper pressing cap through hole, the probe of thermocouple gos deep into sample cylinder being in contact with coal and rock sample；
An insertion aperture is provided centrally with push-down head, is push-down head through hole, the push-down head through hole is prepared with liquid nitrogen and filled
Put and be connected by pipeline, apparatus for producing liquid nitrogen passes through pipeline with holding vessel pressure gauge, the second pressure regulator valve, nitrogen storage tank successively
It is connected；
An insertion aperture is provided with lower pressing cap or push-down head, is hydraulic system through hole, the hydraulic system through hole according to
It is secondary to be connected with confined pressure pressure gauge, confined pressure pressure regulator valve, hydraulic means by pipeline；
Multiple infrared hot plates are evenly arranged with sample cylinder surrounding, is connected in parallel between infrared hot plate, passes through parallel connection
Circuit is connected with multichannel temp controlled meter；Multichannel temp controlled meter is connected with Multichannel data acquisition device；
It is connected by Multichannel data acquisition device with computer, hydraulic pressure signal, temperature signal and acoustic emission signal are unified
Collect in computer and focused on.
Preferably, described seaming chuck first through hole, upper pressing cap through hole, push-down head through hole and hydraulic system through hole are
Manhole.
Preferably, the described through hole of seaming chuck second is arranged on seaming chuck lower surface close to seaming chuck first through hole one
Side.
Described liquid nitrogen output tank and nitrogen storage tank may be configured as the same pot.
Described infrared hot plate is curved surface, and described multiple infrared hot plates are at least 2.
Described hydraulic system plays a part of providing confined pressure for coal petrography sample.
Described temperature control system plays a part of providing heat load for coal petrography sample.
Described data acquisition processing system monitors the processing system of hydraulic pressure, temperature and sound emission data for regulation.
Described coal and rock is provided with seaming chuck and upper pressing cap by above the sample cylinder of carrier, lower section be provided with push-down head and
Lower pressing cap.
Upper pressing cap in described coal and rock stand under load device is " undercut word " shape, and upper pressing cap is provided centrally with through hole, to be upper
Pressure cap runs through through hole；Seaming chuck is " type " shape, and seaming chuck is provided centrally with cylindrical type projection, and upper pressing cap is through through hole and upper pressure
Head cylindrical type projection matches；Upper pressing cap lower surface is in contact with seaming chuck upper surface；
Seaming chuck vertical direction is provided with seaming chuck external screw thread, and the inner side that sample cylinder contacts with seaming chuck is provided with sample cylinder
Internal thread, the outside that sample cylinder contacts with upper pressing cap are provided with sample cylinder external screw thread, are provided with the inside of upper pressing cap vertical direction
Upper pressing cap internal thread；Seaming chuck is connected through a screw thread with sample cylinder contact position, and upper pressing cap is connected with sample cylinder contact position by screw thread
Connect, seaming chuck is connected through a screw thread with upper pressing cap vertical direction contact position.
Lower pressing cap in described coal and rock stand under load device is " character cut in bas-relief " shape, and lower pressing cap is provided centrally with through hole, to push
Cap runs through through hole；Push-down head is " type " shape, and push-down head is provided centrally with cylindrical type projection, and lower pressing cap is through through hole with pushing
Head cylindrical type projection matches；Lower pressing cap lower surface is in contact with push-down head lower surface；
Push-down head vertical direction is provided with push-down head external screw thread, and the inner side that sample cylinder contacts with push-down head is provided with sample cylinder
Internal thread, the outside that sample cylinder contacts with lower pressing cap are provided with sample cylinder external screw thread, are provided with the inside of lower pressing cap vertical direction
Lower pressing cap internal thread；Push-down head is connected through a screw thread with sample cylinder contact position, and lower pressing cap is connected with sample cylinder contact position by screw thread
Connect, push-down head is connected through a screw thread with lower pressing cap vertical direction contact position.
Between the upper pressing cap and seaming chuck, between upper pressing cap and sample cylinder, between lower pressing cap and push-down head, lower pressing cap with
Sealed between sample cylinder with sealing ring.
Be provided with internal thread on the inside of upper pressing cap through hole, thermocouple and upper pressing cap contact position are provided with external screw thread, thermocouple and
Upper pressing cap contact position is connected through a screw thread.
The a kind of of the present invention circulates the method for improving coal and rock fracturing effect using high/low temperature, using said apparatus, specifically
Comprise the following steps：
Step 1：Prepare coal and rock sample and assembled
Coal and rock sample is taken, and runs through a through hole at coal and rock sample center, the coal and rock sample for having through hole is loaded
In sample cylinder, sealing；
Step 2：Confined pressure is applied to coal and rock sample
The confined pressure pressure regulator valve of the hydraulic means in hydraulic system is opened, hydraulic oil is continually fed into sample cylinder, makes coal petrography
Confined pressure suffered by body sample closes the confined pressure pressure regulator valve of hydraulic means, confined pressure holding is stable suffered by coal and rock sample to 15~70MPa
Value；
Step 3：Collect acoustic emission signal
The sound emission data collecting instrument in acoustic emission system is opened, acoustic emission signal is gathered, coal and rock sample deformation is broken
It is bad to carry out real-time monitored；
Step 4：Apply high warm for coal and rock sample to carry
Temperature control system is opened, the temperature value exported is needed in the operation interface input of multichannel temp controlled meter, then connects red
Additional hot plate, continuous heating is carried out to coal and rock sample, coal and rock sample is integrally reached the temperature of setting；
Step 5：Coal and rock sample in hot environment is freezed
The first pressure regulator valve, the second pressure regulator valve and the apparatus for producing liquid nitrogen in refrigeration system are opened, liquid nitrogen output will be stored in
Liquid nitrogen in tank flows into sample cylinder from seaming chuck, is flow to via coal and rock sample through hole at push-down head, now, liquid nitrogen vaporization is
Nitrogen, nitrogen flow to apparatus for producing liquid nitrogen through piping from push-down head, liquid nitrogen are made again, collects into nitrogen storage tank, from
And realize recycling for liquid nitrogen.
Step 6：Gather signal, analyzing and processing
Repeat step four and step 5 are multiple, and by Multichannel data acquisition device by hydraulic pressure signal, temperature signal and sound
Transmission signal is uniformly collected in computer, and the data of computer acquisition are focused on, followed so as to draw in high/low temperature
Coal and rock destroys the rule of damage under ring.
In described step one, described takes coal and rock sample, and concrete operations are the coal obtained with corning machine in coal petrography
Rock mass sample, the size of coal and rock sample is identical with the sample cylinder size in device, preferably Φ 100mm × 100mm.
In described step four, the temperature value of setting sets different temperature according to the difference of coal and rock.
The a kind of of the present invention circulates the apparatus and method for improving coal and rock fracturing effect using high/low temperature, with other coal and rocks
Fracturing technology is compared, and its advantage is：
1. the device of the present invention forms the high/low temperature circulatory system by infrared heating device and liquid nitrogen refrigerating apparatus, in
Coal and rock in confined pressure state is loaded, so as to obtaining on fracturing characteristic of the coal and rock under high/low temperature recurrent state and
Crack propagation law.A kind of method referred to is provided to improve gas extraction efficiency.
2. its refrigerant of the device of the present invention, liquid nitrogen can recycle, cost is low, good in economic efficiency.
3. the inventive method realizes the fracturing of coal and rock using high/low temperature temperature jump, conventional art is to pass through hyperthermia induced
The either single fracturing method such as low temperature bursting by freezing is split, and both fracturing technologies are subjected to organic knot of knowing clearly in the methods of the invention
Close；So as to significantly very high fracturing effect, cost is saved, has improved the efficiency of natural gas extraction.
Brief description of the drawings
Fig. 1 is the structural representation that the device for improving coal and rock fracturing effect is circulated using high/low temperature of the present invention；
Fig. 2 is the structural representation that the device top for improving coal and rock fracturing effect is circulated using high/low temperature of the present invention；
In figure, 1- upper pressing caps, 2- seaming chucks, 3- infrared hot plates, 4- sample cylinders, 5- lower pressing caps, 6- sample cylinder bases, 7-
Acoustic emission sensor, 8- push-down heads, 9- liquid nitrogen output tank, 10- output pressure tank tables, the pressure regulator valves of 11- first, 12- liquid nitrogen storages
Tank, 13- holding vessel pressure gauges, the pressure regulator valves of 14- second, 15- apparatus for producing liquid nitrogen, 16- hydraulic means, 17- confined pressure pressure gauges,
18- confined pressure pressure regulator valves, 19- multichannel temp controlled meters, 20- sound emission data collecting instruments, 21- computers, 22- thermocouples, 23- coal petrographys
Body sample, 24- Multichannel data acquisition devices.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of that the device for improving coal and rock fracturing effect is circulated using high/low temperature, its structural representation is shown in Fig. 1, the device bag
Include refrigerating circulatory device, coal and rock stand under load device, hydraulic system, temperature control system, acoustic emission system and data acquisition processing system；
Described refrigerating circulatory device includes liquid nitrogen output tank 9, the first pressure regulator valve 11, output pressure tank table 10, liquid nitrogen storage
Deposit tank 12, the second pressure regulator valve 14, holding vessel pressure gauge 13 and apparatus for producing liquid nitrogen 15；
Described coal and rock stand under load device includes upper pressing cap 1, seaming chuck 2, sample cylinder 4, lower pressing cap 5, push-down head 8 and sample
Cylinder bottom seat 6；
Described hydraulic system includes hydraulic means 16, confined pressure pressure gauge 17 and confined pressure pressure regulator valve 18；
Described temperature control system includes infrared hot plate 3, thermocouple 22 and multichannel temp controlled meter 19；
Described acoustic emission system includes acoustic emission sensor 7 and sound emission data collecting instrument 20；
Described data acquisition processing system includes Multichannel data acquisition device 24 and computer 21；
The upper pressing cap 1 of coal and rock stand under load device, seaming chuck 2, sample cylinder 4, lower pressing cap 5 and push-down head 8 form one it is closed
Cavity, for placing coal and rock sample 23, lower pressing cap 1 is connected with sample cylinder base 6, whole device is played made of fixing
Effect.
Seaming chuck 2 in coal and rock stand under load device is provided centrally with an insertion aperture, is seaming chuck first through hole, on this
Pressure head first through hole is connected with output pressure tank table 10, the first pressure regulator valve 11, liquid nitrogen output tank 9 by pipeline successively；
Another insertion aperture is additionally provided with seaming chuck 2, is the through hole of seaming chuck second, is installed in the lower surface of seaming chuck 2
Acoustic emission sensor 7 and being picked out by wire by the through hole of seaming chuck second is connected with sound emission data collecting instrument 20；Sound is sent out
Data collecting instrument 20 is penetrated with the Multichannel data acquisition device 24 of data acquisition processing system to be connected；
An insertion aperture is provided with upper pressing cap 1, is upper pressing cap through hole, the thermoelectricity being connected with multichannel temp controlled meter 19
Even 22 are arranged in upper pressing cap through hole, and the probe of thermocouple 22 gos deep into sample cylinder being in contact with coal and rock sample 23；
An insertion aperture is provided centrally with push-down head 8 in coal and rock stand under load device, is push-down head through hole, this is pushed
Head through hole be connected with apparatus for producing liquid nitrogen 15 by pipeline, apparatus for producing liquid nitrogen 15 successively with holding vessel pressure gauge 13, second
Pressure regulator valve 14, nitrogen storage tank 12 are connected by pipeline；
An insertion aperture is provided with lower pressing cap 1 in coal and rock stand under load device, is hydraulic system through hole, the hydraulic pressure
System through hole is connected with confined pressure pressure gauge 17, confined pressure pressure regulator valve 18, hydraulic means 16 by pipeline successively；
In coal and rock stand under load device four curved surface infrared hot plates 3, infrared heating are evenly arranged with the outside of sample cylinder 4
It is connected in parallel between plate 3, is connected by parallel circuit with multichannel temp controlled meter 19；Multichannel temp controlled meter 19 and multi-channel data
Collector 24 is connected；
It is connected by Multichannel data acquisition device 24 with computer 21, hydraulic pressure signal, temperature signal and acoustic emission signal
Uniformly collect in computer and focused on.
Preferably, described seaming chuck first through hole, upper pressing cap through hole, push-down head through hole and hydraulic system through hole are
Manhole.
Preferably, the described through hole of seaming chuck second is arranged on seaming chuck lower surface close to seaming chuck first through hole one
Side.
Described liquid nitrogen output tank 9 and nitrogen storage tank 12 may be configured as the same pot.
Described hydraulic system plays a part of providing confined pressure for coal petrography sample.
Described temperature control system plays a part of providing heat load for coal petrography sample.
Described data acquisition processing system monitors the processing system of hydraulic pressure, temperature and sound emission data for regulation.
Described coal and rock is provided with seaming chuck 2 and upper pressing cap 1 by the top of sample cylinder 4 of carrier, and lower section, which is provided with, to be pushed
First 8 and lower pressing cap 5.
Upper pressing cap 1 in described coal and rock stand under load device is " undercut word " shape, and upper pressing cap 1 is provided centrally with through hole, is
Upper pressing cap runs through through hole；Seaming chuck 2 is " type " shape, and seaming chuck 2 is provided centrally with cylindrical type projection, upper pressing cap through through hole with
Seaming chuck cylindrical type projection matches；The lower surface of upper pressing cap 1 is in contact with the upper surface of seaming chuck 2；
The vertical direction of seaming chuck 2 is provided with seaming chuck external screw thread, and the inner side that sample cylinder 4 contacts with seaming chuck is provided with sample
Cylinder internal thread, the outside that sample cylinder 4 contacts with upper pressing cap are provided with sample cylinder external screw thread, set on the inside of the vertical direction of upper pressing cap 1
It is equipped with upper pressing cap internal thread；Seaming chuck 2 is connected through a screw thread with the contact position of sample cylinder 4, and upper pressing cap 1 leads to the contact position of sample cylinder 4
Threaded connection is crossed, seaming chuck 2 is connected through a screw thread with the vertical direction contact position of upper pressing cap 1.The structural representation of its connected mode
See Fig. 2.
Lower pressing cap 5 in described coal and rock stand under load device is " character cut in bas-relief " shape, and lower pressing cap 5 is provided centrally with through hole, under
Pressure cap runs through through hole；Push-down head 8 is " fall type " shape, and push-down head 8 is provided centrally with cylindrical type projection, lower pressing cap through through hole with
Push-down head cylindrical type projection matches；The lower surface of lower pressing cap 5 is in contact with the lower surface of push-down head 8；
The vertical direction of push-down head 8 is provided with push-down head external screw thread, and the inner side of sample cylinder 4 is provided with sample cylinder internal thread, sample
The outside of cylinder 4 is provided with sample cylinder external screw thread, and lower pressing cap internal thread is provided with the inside of the vertical direction of lower pressing cap 5；Push-down head 8 and sample
The contact position of product cylinder 4 is connected through a screw thread, and lower pressing cap 5 is connected through a screw thread with the contact position of sample cylinder 4, and push-down head 8 is perpendicular with lower pressing cap 5
Nogata is connected through a screw thread to contact position.
Between the upper pressing cap 1 and seaming chuck 2, between upper pressing cap 1 and sample cylinder 4, between lower pressing cap 5 and push-down head 8, under
Sealed between pressure cap 5 and sample cylinder 4 with sealing ring.
Internal thread is provided with the inside of the through hole of upper pressing cap 1, thermocouple 22 is provided with external screw thread, thermoelectricity with the contact position of upper pressing cap 1
Idol 22 and the contact position of upper pressing cap 1 are connected through a screw thread.
It is a kind of that the method for improving coal and rock fracturing effect is circulated using high/low temperature, using said apparatus, specifically include following
Step：
Step 1：Prepare coal and rock sample 23 and assembled
Φ 100mm × 100mm coal and rocks sample 23 is taken in coal petrography with corning machine, and is run through at the center of coal and rock sample 23
One through hole, the coal and rock sample 23 for having through hole is fitted into sample cylinder 4, sealed；
Step 2：Confined pressure is applied to coal and rock sample 23
The confined pressure pressure regulator valve 18 of the hydraulic means 16 in hydraulic system is opened, hydraulic oil is continually fed into sample cylinder 4, makes
Confined pressure suffered by coal and rock sample 23 is protected to 70MPa, the confined pressure pressure regulator valve 18 of closing hydraulic means 16, confined pressure suffered by coal and rock sample
Keep steady definite value；
Step 3：Collect acoustic emission signal
The sound emission data collecting instrument 20 in acoustic emission system is opened, acoustic emission signal is gathered, to coal and rock sample deformation
Destroy and carry out real-time monitored；
Step 4：Apply high warm for coal and rock sample to carry
Temperature control system is opened, the temperature value exported is needed in the operation interface input of multichannel temp controlled meter 19, then connects
Infrared hot plate 3, continuous heating is carried out to coal and rock sample 23, coal and rock sample is integrally reached the temperature of setting；
Wherein, the temperature value of setting sets different temperature according to the difference of coal and rock.
Step 5：Coal and rock sample in hot environment is freezed
The first pressure regulator valve 11, the second pressure regulator valve 14 and the apparatus for producing liquid nitrogen 15 in refrigeration system are opened, liquid will be stored in
Liquid nitrogen in nitrogen output tank 9 flows into sample cylinder 4 from seaming chuck 2, is flow to via the through hole of coal and rock sample 23 at push-down head 8, this
When, liquid nitrogen vaporization is nitrogen, and nitrogen flow to apparatus for producing liquid nitrogen 15 from push-down head 8 through piping, and liquid nitrogen is made again, is collected extremely
In nitrogen storage tank 12, so as to realize recycling for liquid nitrogen.
Step 6：Gather signal, analyzing and processing
Repeat step four and step 5 are multiple, and by Multichannel data acquisition device 24 by hydraulic pressure signal, temperature signal with
Acoustic emission signal is uniformly collected in computer 21, and the data of computer acquisition are focused on, so as to draw in height
The lower coal and rock of temperature circulation destroys the rule of damage.
Embodiment 2
It is a kind of that the device for improving coal and rock fracturing effect is circulated using high/low temperature, with embodiment 1.
It is a kind of that the method for improving coal and rock fracturing effect is circulated using high/low temperature, using said apparatus, specifically include following
Step：
Step 1：Prepare coal and rock sample 23 and assembled
Φ 100mm × 100mm coal and rocks sample 23 is taken in coal petrography with corning machine, and is run through at the center of coal and rock sample 23
One through hole, the coal and rock sample 23 for having through hole is fitted into sample cylinder 4, sealed；
Step 2：Confined pressure is applied to coal and rock sample 23
The confined pressure pressure regulator valve 18 of the hydraulic means 16 in hydraulic system is opened, hydraulic oil is continually fed into sample cylinder 4, makes
Confined pressure suffered by coal and rock sample 23 is protected to 15MPa, the confined pressure pressure regulator valve 18 of closing hydraulic means 16, confined pressure suffered by coal and rock sample
Keep steady definite value；
Step 3：Collect acoustic emission signal
The sound emission data collecting instrument 20 in acoustic emission system is opened, acoustic emission signal is gathered, to coal and rock sample deformation
Destroy and carry out real-time monitored；
Step 4：Apply high warm for coal and rock sample to carry
Temperature control system is opened, the temperature value exported is needed in the operation interface input of multichannel temp controlled meter 19, then connects
Infrared hot plate 3, continuous heating is carried out to coal and rock sample 23, coal and rock sample is integrally reached the temperature of setting；
Wherein, the temperature value of setting sets different temperature according to the difference of coal and rock.
Step 5：Coal and rock sample in hot environment is freezed
The first pressure regulator valve 11, the second pressure regulator valve 14 and the apparatus for producing liquid nitrogen 15 in refrigeration system are opened, liquid will be stored in
Liquid nitrogen in nitrogen output tank 9 flows into sample cylinder 4 from seaming chuck 2, is flow to via the through hole of coal and rock sample 23 at push-down head 8, this
When, liquid nitrogen vaporization is nitrogen, and nitrogen flow to apparatus for producing liquid nitrogen 15 from push-down head 8 through piping, and liquid nitrogen is made again, is collected extremely
In nitrogen storage tank 12, so as to realize recycling for liquid nitrogen.
Step 6：Gather signal, analyzing and processing
Repeat step four and step 5 are multiple, and by Multichannel data acquisition device 24 by hydraulic pressure signal, temperature signal with
Acoustic emission signal is uniformly collected in computer 21, and the data of computer acquisition are focused on, so as to draw in height
The lower coal and rock of temperature circulation destroys the rule of damage.
Claims (9)
1. a kind of circulate the device for improving coal and rock fracturing effect using high/low temperature, it is characterised in that this is circulated using high/low temperature
Improving the device of coal and rock fracturing effect includes refrigerating circulatory device, coal and rock stand under load device, hydraulic system, temperature control system, sound
Emission system and data acquisition processing system；
Described refrigerating circulatory device includes liquid nitrogen output tank, the first pressure regulator valve, output pressure tank table, nitrogen storage tank, second
Pressure regulator valve, holding vessel pressure gauge and apparatus for producing liquid nitrogen；
Described coal and rock stand under load device includes upper pressing cap, seaming chuck, sample cylinder, lower pressing cap, push-down head and sample cylinder base；
Described hydraulic system includes hydraulic means, confined pressure pressure gauge and confined pressure pressure regulator valve；
Described temperature control system includes infrared hot plate, thermocouple and multichannel temp controlled meter；
Described acoustic emission system includes acoustic emission sensor and sound emission data collecting instrument；
Described data acquisition processing system includes Multichannel data acquisition device and computer；
Upper pressing cap, seaming chuck, sample cylinder, lower pressing cap and the push-down head of coal and rock stand under load device form a closed cavity, push
Cap is connected with sample cylinder base；
Seaming chuck in coal and rock stand under load device is provided centrally with an insertion aperture, is seaming chuck first through hole, the seaming chuck
First through hole is connected with output pressure tank table, the first pressure regulator valve, liquid nitrogen output tank by pipeline successively；
Another insertion aperture is additionally provided with seaming chuck, is the through hole of seaming chuck second, sound hair is installed in seaming chuck lower surface
Penetrate sensor and picked out by wire by the through hole of seaming chuck second and is connected with sound emission data collecting instrument；Sound emission data acquisition
Instrument is connected with the Multichannel data acquisition device of data acquisition processing system；
An insertion aperture is provided with upper pressing cap, is upper pressing cap through hole, the installation of TC being connected with multichannel temp controlled meter
In upper pressing cap through hole, the probe of thermocouple gos deep into sample cylinder being in contact with coal and rock sample；
An insertion aperture is provided centrally with push-down head, is push-down head through hole, the push-down head through hole leads to apparatus for producing liquid nitrogen
Piping is connected, and apparatus for producing liquid nitrogen is connected with holding vessel pressure gauge, the second pressure regulator valve, nitrogen storage tank by pipeline successively
Connect；
An insertion aperture is provided with lower pressing cap or push-down head, is hydraulic system through hole, the hydraulic system through hole successively with
Confined pressure pressure gauge, confined pressure pressure regulator valve, hydraulic means are connected by pipeline；
Multiple infrared hot plates are evenly arranged with sample cylinder surrounding, is connected in parallel between infrared hot plate, passes through parallel circuit
It is connected with multichannel temp controlled meter；Multichannel temp controlled meter is connected with Multichannel data acquisition device；
It is connected by Multichannel data acquisition device with computer, hydraulic pressure signal, temperature signal and acoustic emission signal are unified to be gathered
Focused on into computer.
2. the device of coal and rock fracturing effect is improved using high/low temperature circulation as claimed in claim 1, it is characterised in that described
Liquid nitrogen output tank and nitrogen storage tank may be configured as the same pot.
3. the device of coal and rock fracturing effect is improved using high/low temperature circulation as claimed in claim 1, it is characterised in that described
Infrared hot plate be curved surface, described multiple infrared hot plates are at least 2.
4. the device of coal and rock fracturing effect is improved using high/low temperature circulation as claimed in claim 1, it is characterised in that described
Coal and rock by carrier sample cylinder above be provided with seaming chuck and upper pressing cap, lower section is provided with push-down head and lower pressing cap；
Upper pressing cap in described coal and rock stand under load device is " undercut word " shape, and upper pressing cap is provided centrally with through hole, is upper pressing cap
Through through hole；Seaming chuck is " type " shape, and seaming chuck is provided centrally with cylindrical type projection, and upper pressing cap is justified through through hole and seaming chuck
Stud bump matches；Upper pressing cap lower surface is in contact with seaming chuck upper surface；
Seaming chuck vertical direction is provided with seaming chuck external screw thread, and the inner side that sample cylinder contacts with seaming chuck is provided with spiral shell in sample cylinder
Line, the outside that sample cylinder contacts with upper pressing cap are provided with sample cylinder external screw thread, pressure are provided with the inside of upper pressing cap vertical direction
Cap internal thread；Seaming chuck is connected through a screw thread with sample cylinder contact position, and upper pressing cap is connected through a screw thread with sample cylinder contact position, on
Pressure head is connected through a screw thread with upper pressing cap vertical direction contact position；
Lower pressing cap in described coal and rock stand under load device is " character cut in bas-relief " shape, and lower pressing cap is provided centrally with through hole, passed through for lower pressing cap
Reach through hole；Push-down head is " type " shape, and push-down head is provided centrally with cylindrical type projection, and lower pressing cap is justified through through hole and push-down head
Stud bump matches；Lower pressing cap lower surface is in contact with push-down head lower surface；
Push-down head vertical direction is provided with push-down head external screw thread, and the inner side that sample cylinder contacts with push-down head is provided with spiral shell in sample cylinder
Line, the outside that sample cylinder contacts with lower pressing cap are provided with sample cylinder external screw thread, are provided with and push on the inside of lower pressing cap vertical direction
Cap internal thread；Push-down head is connected through a screw thread with sample cylinder contact position, and lower pressing cap is connected through a screw thread with sample cylinder contact position, under
Pressure head is connected through a screw thread with lower pressing cap vertical direction contact position.
5. the device of coal and rock fracturing effect is improved using high/low temperature circulation as claimed in claim 1, it is characterised in that described
Between upper pressing cap and seaming chuck, between upper pressing cap and sample cylinder, between lower pressing cap and push-down head, between lower pressing cap and sample cylinder
Sealed with sealing ring.
6. the device of coal and rock fracturing effect is improved using high/low temperature circulation as claimed in claim 1, it is characterised in that upper pressure
Internal thread is provided with the inside of cap through hole, thermocouple is provided with external screw thread, thermocouple and upper pressing cap contact position with upper pressing cap contact position
It is connected through a screw thread.
7. a kind of circulate the method for improving coal and rock fracturing effect using high/low temperature, using the device described in claim 1, it is special
Sign is, comprises the following steps：
Step 1：Prepare coal and rock sample and assembled
Coal and rock sample is taken, and runs through a through hole at coal and rock sample center, the coal and rock sample for having through hole is loaded into sample
In cylinder, sealing；
Step 2：Confined pressure is applied to coal and rock sample
The confined pressure pressure regulator valve of the hydraulic means in hydraulic system is opened, hydraulic oil is continually fed into sample cylinder, tries coal and rock
Confined pressure suffered by sample closes the confined pressure pressure regulator valve of hydraulic means to 15~70MPa, and confined pressure suffered by coal and rock sample remains stable；
Step 3：Collect acoustic emission signal
Open acoustic emission system in sound emission data collecting instrument, gather acoustic emission signal, coal and rock sample deformation is destroyed into
Row real-time monitored；
Step 4：Apply high warm for coal and rock sample to carry
Temperature control system is opened, the temperature value exported is needed in the operation interface input of multichannel temp controlled meter, then connects infrared add
Hot plate, continuous heating is carried out to coal and rock sample, coal and rock sample is integrally reached the temperature of setting；
Step 5：Coal and rock sample in hot environment is freezed
The first pressure regulator valve, the second pressure regulator valve and the apparatus for producing liquid nitrogen in refrigeration system are opened, will be stored in liquid nitrogen output tank
Liquid nitrogen from seaming chuck flow into sample cylinder, flow to via coal and rock sample through hole at push-down head, now, liquid nitrogen vaporization is nitrogen
Gas, nitrogen flow to apparatus for producing liquid nitrogen through piping from push-down head, liquid nitrogen are made again, collects into nitrogen storage tank；
Step 6：Repeat step four and step 5 are multiple, and by Multichannel data acquisition device by hydraulic pressure signal, temperature signal with
Acoustic emission signal is uniformly collected in computer, and the data of computer acquisition are focused on, and is drawn and is circulated in high/low temperature
Lower coal and rock destroys the rule of damage.
8. the method for improving coal and rock fracturing effect using high/low temperature circulation as claimed in claim 1, it is characterised in that described
The step of one in, described takes coal and rock sample, and concrete operations are the coal and rock sample obtained with corning machine in coal petrography, coal
The size of rock mass sample is identical with the sample cylinder size in device.
9. the method for improving coal and rock fracturing effect using high/low temperature circulation as claimed in claim 1, it is characterised in that described
The step of four in, the temperature value of setting sets different temperature according to the difference of coal and rock.
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| CN113281191A (en) * | 2021-05-25 | 2021-08-20 | 中国科学院武汉岩土力学研究所 | High-low temperature fracturing test device and test method based on same |
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| CN110823757A (en) * | 2019-11-28 | 2020-02-21 | 辽宁工程技术大学 | Low-permeability coal bed gas microwave-liquid nitrogen circulating freeze-thaw degradation-promotion permeability-increasing experimental device and method |
| CN113156079A (en) * | 2021-03-31 | 2021-07-23 | 西安科技大学 | Liquid nitrogen immersion coal sample crack space-time evolution and mechanical parameter testing experimental device |
| CN113156079B (en) * | 2021-03-31 | 2023-06-27 | 西安科技大学 | Experimental device for testing space-time evolution and mechanical parameters of liquid nitrogen immersed coal sample cracks |
| CN113281191A (en) * | 2021-05-25 | 2021-08-20 | 中国科学院武汉岩土力学研究所 | High-low temperature fracturing test device and test method based on same |
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