CN107515185A - A kind of coal body permeability test device and its application method - Google Patents
A kind of coal body permeability test device and its application method Download PDFInfo
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- CN107515185A CN107515185A CN201710785780.9A CN201710785780A CN107515185A CN 107515185 A CN107515185 A CN 107515185A CN 201710785780 A CN201710785780 A CN 201710785780A CN 107515185 A CN107515185 A CN 107515185A
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- 239000003245 coal Substances 0.000 title claims abstract description 113
- 230000035699 permeability Effects 0.000 title claims abstract description 60
- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000011435 rock Substances 0.000 claims abstract description 52
- 238000005259 measurement Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 3
- 210000001367 artery Anatomy 0.000 claims 1
- 238000009738 saturating Methods 0.000 claims 1
- 210000003462 vein Anatomy 0.000 claims 1
- 238000009423 ventilation Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 46
- 230000008859 change Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000023753 dehiscence Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0422—Shear waves, transverse waves, horizontally polarised waves
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
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- Dispersion Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of coal body permeability test device and its application method, including support, clamper, confined pressure pump, axle press pump, gas cylinder and gas booster pump；Clamper is set in the bracket, clamper includes cylinder, and the top and bottom of cylinder are coated with rock core plug respectively, and rock core plug is provided with passage respectively in axial direction, the side wall of cylinder is provided with the confined pressure interface connected with the inner chamber of cylinder, and confined pressure interface is connected by pipeline with confined pressure pump；Support above clamper is provided with axle pressure chamber, and the lower end of axle pressure chamber is provided with expansion link, and the lower end of expansion link is connected with the upper end of the rock core plug of cylinder upper end, and axle pressure chamber is connected by axle pressure pipe road with axle press pump；Passage in the rock core plug of cylinder upper end is connected by pipeline with the outlet side of gas boosting pump, and the inlet end of gas boosting pump is connected with gas cylinder.The present invention is simple in construction, easy to operate, and test result is accurate, can not only test coal body permeability, while can also test the permeability and Ultrasonic characteristics of other rock samples.
Description
Technical field
The invention belongs to coal body permeability technical field of measurement and test, more particularly to a kind of coal body permeability test device and its make
Use method.
Background technology
Coal resources in China is quite abundant, and preservation has a large amount of gas (coal bed gas) in coal seam, is a kind of important energy, right
The exploitation of coal bed gas can provide powerful power supply for society.Coal body permeability is to weigh the infiltrative parameter of coal body,
CBM exploration and development field, the size of coalbed methane reservoir permeability are to influence whether coal bed gas has the important ginseng of Development volue
Number, the anisotropy measure of coal body permeability is the basis of cbm development, and the measure of permeability is carried out in fact by laboratory
It is most convenient most accurate method to test analysis.
Gas is also a kind of pernicious gas in mine governance process, staff can be made to suffocate in mine, when watt
This concentration reaches certain limit and also has the danger exploded, and has so both influenceed the safety in production of national wealth and mine, also prestige
The security of the lives and property of staff is coerced, and these gases are directly discharged into air also to cause environmental pollution.If can handle
The generation that the direct extraction of coal bed gas and being used both reduces this kind of disaster can also reach the purpose to turn waste into wealth, therefore coal
The exploitation of layer gas is respectively provided with important meaning for environmental protection and economic development.
In the case where being adopted, original crustal stress can be destroyed coal body, and crustal stress suffered by coal seam can be dynamic with adopting
Influence and constantly change.Meanwhile coal seam crustal stress dominates the change of effective stress, direct or indirect controlling is permeated
Rate.But the equipment of test permeability is the permeability tested under a certain state of coal sample in the past, can not reflect permeability
Truth.Therefore above various reasons are based on, it is necessary to which the permeability anisotropy in the case of different compressions is carried out to coal body
Research.Different crustal stress are being simulated by different pressures situation by coal body, permeated so as to study coal body under different stressing conditions
The changing rule of coal body permeability under the anisotropy and different pressures of rate, analyze the crack feelings of Coal Pore Structure and its inside
Condition, so as to instruct the utilization of coal bed gas, turn waste into wealth, but also mine can be made to be kept the safety in production, avoid disaster
Occur.
Existing coal body permeability survey method has cycle Loading Method, impulse method and steady state method, wherein with impulse method and surely
Based on state method, it is primarily present problems with：
Existing experimental facilities is measured in the presence of very big difficulty to the permeability in coal body destructive process and after destruction.Mostly
The poor sealing of coal sample clamper, all uses operator's hand-kept, makes the permeability of measurement in many cases in number equipment
Larger error be present with actual value.And existing equipment is single measurement coal body permeability, it is impossible to ultrasonic parameters
Measurement carry out simultaneously.
The content of the invention
It is an object of the invention to provide a kind of coal body permeability test device and its application method, permeability measuring apparatus
It is merged with ultrasonic measuring device, can reach in a pressure process while measure permeability and ultrasonic parameters
Purpose.Ess-strain of the sample in pressurized process can also be measured simultaneously.This method is easy directly, and test result is by data
Reason system records automatically, operates save trouble and labor.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of coal body permeability test device, including support, clamper, confined pressure pump, axle press pump, gas cylinder and gas boosting
Pump；Clamper is set in the bracket, and clamper includes the cylinder of upper and lower opening, and the top and bottom of cylinder are slided respectively is coated with rock
Heart plug, rock core plug are provided with passage respectively in axial direction, and the side wall of cylinder is provided with the confined pressure interface connected with the inner chamber of cylinder, confined pressure
Interface is connected by pipeline with confined pressure pump；Support above clamper is provided with axle pressure chamber, and the lower end of axle pressure chamber is provided with expansion link,
The lower end of expansion link is connected with the upper end of the rock core plug of cylinder upper end, and axle pressure chamber is connected by axle pressure pipe road with axle press pump；Cylinder
Passage in the rock core plug of upper end is connected by pipeline with the outlet side of gas boosting pump, the inlet end and gas of gas boosting pump
Bottle connection.
Preferably, the top and bottom of cylinder are respectively equipped with pressure-pad, and what rock core plug slided respectively is installed on corresponding pressure-pad
In, rubber sleeve is provided with the inner chamber of cylinder, coal sample is set with rubber sleeve, the top and bottom of rubber sleeve are installed with envelope respectively
Head, what the rock core plug in the inner chamber of cylinder slided is installed in corresponding end socket.
Preferably, the outer wall of end socket is set with square seal ring and circular seal with the matching of the inwall of corresponding cylinder
Circle.
Preferably, the top and bottom of rubber sleeve are respectively equipped with conical internal cavity, and end socket is provided with the cone matched with conical internal cavity
Shape face.
Preferably, rock core plug is respectively equipped with porous plate with the end face of corresponding coal sample.
Preferably, rock core plug is built-in with ultrasonic transducer, and ultrasonic transducer is occurred by circuit and ultrasonic pulse
Device is connected, and ultrasonic pulse generator is connected by circuit with digital oscilloscope.
Preferably, the passage in the rock core plug of cylinder lower end is connected by pipeline with gas collector, on pipeline also
Provided with vavuum pump, outlet pressure sensor, flowmeter and valve.
Preferably, the pipeline between gas boosting pump and clamper is provided with inlet pressure sensor.
Preferably, be additionally provided with data collecting system, digital oscilloscope, inlet pressure sensor, outlet pressure sensor and
Flowmeter is connected with data collecting system respectively.
A kind of application method based on coal body permeability test device, comprises the following steps：
(1) sample preparation：According to the object to be studied, corresponding sample is taken, then drills through circle according to different directions
The coal sample of cylindricality, make its upper and lower two end face with axially vertical, and ensure that its surfacing is smooth, and use vernier caliper measurement
The length and its diameter of coal sample；
(2) valve of gas circuit is closed；
(3) coal sample prepared is taken, puts it into clamper, then loads onto rock core plug；Clamper is arranged on branch
On frame, stabilize it；
(4) pipeline of confined pressure pump is connected on confined pressure interface, starts confined pressure pump, set confined pressure parameter to be pressurizeed；
(5) start axle press pump, set axle to press parameter to be pressurizeed；
(6) start vavuum pump to vacuumize, pressure in system is less than 40pa, be then shut off vavuum pump；
(7) valve of gas cylinder is opened, gas is passed through to coal sample, treats its adsorption equilibrium；
(8) after adsorption equilibrium, open data handling system, carry out the setting of parameter, including coal sample length, coal sample diameter,
Test gas viscosity, atmospheric pressure；
(9) after setting parameter in a data processing system, open valve and start to test；
(10) after test terminates, valve is closed；Then axle pressure pressure value is once again set up, next time is carried out after its adsorption equilibrium
Test；
All parameters in test process, including coal sample length, coal sample diameter, gas viscosity, atmospheric pressure, inlet pressure
The numerical value of sensor, the numerical value of outlet pressure sensor, the numerical value of flowmeter and the permeability result that is calculated according to formula
It can be automatically saved in Excel file；
According to Darcy formula, the formula of gas permeability is：(10-3μm2)
In formula, K-gas permeability；A-coal sample sectional area, calculated according to coal sample diameter；L-coal sample length；P1、P2—
Coal sample entrance and outlet pressure；P0- atmospheric pressure；μ-gas viscosity；Q0- flowmeter flow；
When measuring permeability, the axle pressure of sample treats that coal body internal stability can measure with after confined pressure application 20 minutes
The longitudinal and transverse velocity of wave of coal sample；
Velocity of wave calculation formula is as follows：
The P-wave And S velocity of wave calculation formula of ultrasonic wave：
Compressional wave：VP=L/tP-t0
Shear wave：VS=L/tS-t0
In formula：VP- longitudinal wave velocity；VS- transverse wave speed；L-coal sample length；tPThe time that-compressional wave is walked in the sample；
tSThe time that-shear wave is walked in the sample；t0The zero propagation of-instrument system.
Preferably, when measuring permeability, the axle pressure of sample treats coal body internal stability with after confined pressure application 20 minutes,
The longitudinal and transverse velocity of wave of coal sample is measured, measuring process is as follows：
(1) ultrasonic pulse generator and digital oscilloscope are opened；
(2) the compressional wave measurement circuitry of clamper top rock core plug is connected on the interface of ultrasonic pulse generator；
(3) the compressional wave measurement circuitry of clamper bottom rock core plug is connected on the interface of digital oscilloscope；
(4) control handle on digital oscilloscope is adjusted, until there is preferable oscillogram on digital oscilloscope；
(5) operating data processing system record P wave data；
(6) the amount circuit of the compressional wave of clamper top rock core plug is removed, shear wave measurement circuitry is then connected to ultrasonic wave
On the interface of impulse generator；
(7) the amount circuit of the compressional wave of clamper bottom rock core plug is removed, shear wave measurement circuitry then is connected into numeral shows
On the interface of ripple device；
(8) operating data processing system record shear wave data.
Present invention has the advantage that：
1. the coal body permeability test device of the present invention is simple in construction, easy to operate, test result is accurate, can not only survey
Coal body permeability is tried, while the permeability and Ultrasonic characteristics of other rock samples can also be tested, there is portability, it is general
The features such as property is stronger.
2. the ultrasonic pulse generator in the coal body permeability test device of the present invention can excite the super of certain frequency
Sound wave, after digital oscilloscope adjusts waveform, the acoustic signals by coal body can be gathered, can by the change of ultrasonic velocity
To reflect the change and distribution in coal body internal holes crack, permeability and ultrasonic wave are measured in same process, make test result
More accurately and reliably.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the vertical section schematic diagram of clamper in Fig. 1；
Fig. 3 is the top view of porous plate in Fig. 2；
Fig. 4 is the curve map drawn using P wave data；
In figure：1 is axle press pump, and 2 be gas cylinder, and 3 be gas boosting pump, and 4 be inlet pressure sensor, and 5 be clamper, and 6 are
Coal sample, 7 be outlet pressure sensor, and 8 be flowmeter, and 9 be valve, and 10 be data collecting system, and 11 be confined pressure pump, and 12 be vacuum
Pump, 13 be axle pressure pipe road, and 14 be support, and 15 be gas collector, and 16 be ultrasonic pulse generator, and 17 be digital oscillography
Device；51 be rock core plug, and 52 be end socket, and 53 be pressure-pad, and 54 be cylinder, and 55 be confined pressure interface, and 56 be rubber sleeve, and 57 be quad seal
Circle, 58 be circular seal ring, and 59 be porous plate, and 510 be ultrasonic transducer.
Embodiment
A kind of coal body permeability test device, as Figure 1-3, including axle press pump 1, gas cylinder 2, gas boosting pump 3, clamping
Device 5, confined pressure pump 11 and support 14.Clamper 5 is located in support 14, and clamper 5 includes the cylinder 54 of upper and lower opening, cylinder 54
Top and bottom are slided respectively is coated with rock core plug 51, and rock core plug 51 is provided with passage respectively in axial direction, and the side wall of cylinder 54 is set
There is the confined pressure interface 55 that the inner chamber with cylinder 54 connects, confined pressure interface 55 is connected by pipeline with confined pressure pump 11.
The support 14 of the top of clamper 5 is provided with axle pressure chamber, and the lower end of axle pressure chamber is provided with expansion link, the lower end of expansion link and
The upper end connection of the rock core plug 51 of the upper end of cylinder 54, axle pressure chamber are connected by axle pressure pipe road 13 with axle press pump 1；The upper end of cylinder 54
Passage in rock core plug 51 is connected by pipeline with the outlet side of gas boosting pump 3, the inlet end and gas cylinder of gas boosting pump 3
2 connections.
The top and bottom of cylinder 54 are respectively equipped with pressure-pad 53, and pressure-pad 53 is threadedly coupled with cylinder 54, attachment structure
Firmly.
What rock core plug 51 slided respectively is installed in corresponding pressure-pad 53, and rubber sleeve 56, rubber are provided with the inner chamber of cylinder 54
Coal sample 6 is set with gum cover 56, the top and bottom of rubber sleeve 56 are installed with end socket 52 respectively, in the inner chamber of cylinder 54
What rock core plug 51 slided is installed in corresponding end socket 52.Rock core plug 51, end socket 52, pressure-pad 53, cylinder 54 are made by steel.
The outer wall of end socket 52 is set with square seal ring 57 and circular seal ring with the matching of the inwall of corresponding cylinder 54
58。
The top and bottom of rubber sleeve 56 are respectively equipped with conical internal cavity, and end socket 52 is provided with the taper matched with conical internal cavity
Face.Due to the presence of pyramidal structure, thus in the bigger clamper 5 of pressure wedge be bonded it is closer, can reach good sealing
Effect, it so can guarantee that the seal of experimental system.
Rock core plug 51 is respectively equipped with porous plate 59 with the end face of corresponding coal sample 6.Rock core plug 51 is built-in with ultrasonic wave transducer
Device 510, ultrasonic transducer 510 are connected by circuit with ultrasonic pulse generator 16, and ultrasonic pulse generator 16 passes through
Circuit is connected with digital oscilloscope 17.Ultrasonic pulse generator 16 uses Olympus (OLYMPUS) 5077PR pulse generations
Device, the tester are equipped with compressional wave (P ripples), shear wave (S ripples) activating system.Digital oscilloscope 17 uses Tyke TDS2014C series numbers
Signal-under-test is sampled and quantified first, preserved in memory, passed through with binary signal by word oscillograph, digital oscilloscope
Specific algorithm in a continuous fashion displays the centrifugal pump of measured signal on screen, and the oscillograph has capture transient wave
The functional characteristics such as shape, stored waveform.
Ultrasonic transducer 510 is located in rock core plug 51, can both transmit signal, can also bear pressure, rock core plug 51
Preferable protective effect is played to ultrasonic transducer 510.
Passage in the rock core plug 51 of the lower end of cylinder 54 is connected by pipeline with gas collector 15, is also set on pipeline
There are vavuum pump 12, outlet pressure sensor 7, flowmeter 8 and valve 9.Set on pipeline between gas boosting pump 3 and clamper 5
There is inlet pressure sensor 4.Gas collector 15 is by the gas discharged in drainage collecting, in case gas escapes,
Cause potential safety hazard.
It is additionally provided with data collecting system 10, digital oscilloscope 17, inlet pressure sensor 4, outlet pressure sensor 7 and stream
Gauge 8 is connected with data collecting system 10 respectively, and the parameters that data collecting system 10 is used in harvester are gone forward side by side line number
According to processing.
The present invention can be carried out real-time in the case of conversion confined pressure and axle pressure to the permeability of coal body at various pressures
Measurement.Ultrasonic pulse generator can excite the ultrasonic wave of certain frequency, and waveform is adjusted in digital oscilloscope, after can gather
By the acoustic signals of coal body, the change and distribution in coal body internal holes crack can be reflected by the change of ultrasonic velocity.Two
Individual pressure sensor and high precision flow are connected with data collecting system, when carrying out data acquisition, data acquisition system
System can voluntarily gathered data, while data acquisition, can calculate automatically corresponding to permeability and preserve, it is therefore non-in operating process
It is often easy, permeability and ultrasonic wave are measured in same process, make test result more accurately and reliably.
A kind of application method based on coal body permeability test device, comprises the following steps：
(1) sample preparation：According to the object to be studied, corresponding sample is taken, then drills through circle according to different directions
The coal sample 6 of cylindricality, make its upper and lower two end face with axially vertical, and ensure that its surfacing is smooth, and use vernier caliper measurement
The length and its diameter of coal sample 6；The specification of coal sample 6 is Φ 25mm × 50mm -60mm or Φ 50mm × 50mm -100mm；
(2) valve 9 of gas circuit is closed；
(3) coal sample prepared 6 is taken, puts it into clamper 5, then loads onto rock core plug 51；Clamper 5 is installed
On the support 14, stabilize it；
(4) pipeline of confined pressure pump 11 is connected on confined pressure interface 55, starts confined pressure pump 11, set confined pressure parameter to be added
Pressure；
(5) start axle press pump 1, set axle to press parameter to be pressurizeed；
(6) start vavuum pump 12 to vacuumize, pressure in system is less than 40pa, be then shut off vavuum pump 12；
(7) valve of gas cylinder 2 is opened, gas is passed through to coal sample 6, treats its adsorption equilibrium；
(8) after adsorption equilibrium, data handling system is opened, carries out the setting of parameter, including the length of coal sample 6, coal sample 6 are straight
Footpath, test gas viscosity, atmospheric pressure；
(9) after setting parameter in a data processing system, open valve 9 and start to test；
(10) after test terminates, valve 9 is closed；Then axle pressure pressure value is once again set up, is carried out down after its adsorption equilibrium
Secondary test；
All parameters in test process, including coal sample length, coal sample diameter, gas viscosity, atmospheric pressure, inlet pressure
The numerical value of sensor, the numerical value of outlet pressure sensor, the numerical value of flowmeter and the permeability result that is calculated according to formula
It can be automatically saved in Excel file；
According to Darcy formula, the formula of gas permeability is：(10-3μm2)
In formula, K-gas permeability；A-coal sample sectional area, calculated according to coal sample diameter；L-coal sample length；P1、P2—
Coal sample entrance and outlet pressure；P0- atmospheric pressure；μ-gas viscosity；Q0The flow of-flowmeter 8；
When measuring permeability, the axle pressure of sample treats that coal body internal stability can measure with after confined pressure application 20 minutes
The longitudinal and transverse velocity of wave of coal sample 6.Measuring process is as follows：
(1) ultrasonic pulse generator 16 and digital oscilloscope 17 are opened.
(2) the compressional wave measurement circuitry of the top rock core plug 51 of clamper 5 is connected to the interface of ultrasonic pulse generator 16
On.
(3) the compressional wave measurement circuitry of the bottom rock core plug 51 of clamper 5 is connected on the interface of digital oscilloscope 17.
(4) control handle on digital oscilloscope 17 is adjusted, until there is preferable oscillogram on digital oscilloscope 17.
(5) operating data processing system record P wave data.
(6) measurement circuitry of the compressional wave of the top rock core plug 51 of clamper 5 is removed, is then connected to shear wave measurement circuitry super
On the interface of sound wave pulse generator 16.
(7) measurement circuitry of the compressional wave of the bottom rock core plug 51 of clamper 5 is removed, shear wave measurement circuitry is then connected to number
On the interface of word oscillograph 17.
(8) operating data processing system record shear wave data.
Velocity of wave calculation formula is as follows：
The P-wave And S velocity of wave calculation formula of ultrasonic wave：Compressional wave：VP=L/tP-t0
Shear wave：VS=L/tS-t0
In formula：VP- longitudinal wave velocity；VS- transverse wave speed；L-coal sample length；tPThe time that-compressional wave is walked in the sample；
tSThe time that-shear wave is walked in the sample；t0The zero propagation of-instrument system.
As shown in Figure 4, continue with the load time, longitudinal wave velocity is continuously increased, before 1.5MPa velocity of wave increase compared with
It hurry up, illustrate inside coal body, most of crack hole closes, and permeability will reduce；Velocity of wave increase afterwards is slow, in pressure
Velocity of wave reaches maximum when reaching 3.6MPa or so, hereafter diminishes with the increase velocity of wave of stress, illustrates that coal body acts in pressure
The lower extension that crack occurs simultaneously generates new porous dehiscence gap, and coal body permeability can increase afterwards.
Embodiment described above is only that the preferred embodiment of the present invention is described, and is set not departing from the present invention
On the premise of meter spirit, various modifications and improvement that those of ordinary skill in the art make to technical scheme all should
Fall into the protection domain of claims of the present invention determination.
Claims (10)
- A kind of 1. coal body permeability test device, it is characterised in that：Including support, clamper, confined pressure pump, axle press pump, gas cylinder and Gas boosting pump；Clamper is set in the bracket, and clamper includes the cylinder of upper and lower opening, and the top and bottom of cylinder are slided respectively Rock core plug is coated with, rock core plug is provided with passage respectively in axial direction, and the side wall of cylinder is provided with the confined pressure connected with the inner chamber of cylinder Interface, confined pressure interface are connected by pipeline with confined pressure pump；Support above clamper is provided with axle pressure chamber, and the lower end of axle pressure chamber is set There is expansion link, the lower end of expansion link is connected with the upper end of the rock core plug of cylinder upper end, and axle pressure chamber passes through axle pressure pipe road and axle press pump Connection；Passage in the rock core plug of cylinder upper end is connected by pipeline with the outlet side of gas boosting pump, gas boosting pump Inlet end is connected with gas cylinder.
- 2. coal body permeability test device as claimed in claim 1, it is characterised in that：The top and bottom of cylinder are respectively equipped with Pressure-pad, what rock core plug slided respectively is installed in corresponding pressure-pad, and rubber sleeve is provided with the inner chamber of cylinder, is set with rubber sleeve Coal sample, the top and bottom of rubber sleeve are installed with end socket respectively, and what rock core plug in the inner chamber of cylinder slided be installed on pair In the end socket answered；The outer wall of end socket is set with square seal ring and circular seal ring with the matching of the inwall of corresponding cylinder.
- 3. coal body permeability test device as claimed in claim 2, it is characterised in that：The top and bottom of rubber sleeve are set respectively There is conical internal cavity, end socket is provided with the taper surface matched with conical internal cavity.
- 4. coal body permeability test device as claimed in claim 3 and its application method, it is characterised in that：Rock core plug with it is corresponding The end face of coal sample be respectively equipped with porous plate.
- 5. coal body permeability test device as claimed in claim 4, it is characterised in that：Rock core plug is built-in with ultrasonic wave transducer Device, ultrasonic transducer are connected by circuit with ultrasonic pulse generator, and ultrasonic pulse generator passes through circuit and numeral Oscillograph connects.
- 6. coal body permeability test device as claimed in claim 5, it is characterised in that：Ventilation in the rock core plug of cylinder lower end Hole is connected by pipeline with gas collector, and vavuum pump, outlet pressure sensor, flowmeter and valve are additionally provided with pipeline.
- 7. coal body permeability test device as claimed in claim 6, it is characterised in that：Between gas boosting pump and clamper Pipeline is provided with inlet pressure sensor.
- 8. coal body permeability test device as claimed in claim 7, it is characterised in that：Data collecting system is additionally provided with, numeral Oscillograph, inlet pressure sensor, outlet pressure sensor and flowmeter are connected with data collecting system respectively.
- A kind of 9. application method of the coal body permeability test device based on described in claim 8, it is characterised in that：Including following Step：(1) sample preparation：According to the object to be studied, corresponding sample is taken, then drills through cylinder according to different directions Coal sample, make its upper and lower two end face with axially vertical, and ensure that its surfacing is smooth, and with vernier caliper measurement coal sample Length and its diameter；(2) valve of gas circuit is closed；(3) coal sample prepared is taken, puts it into clamper, then loads onto rock core plug；Clamper is rack-mount, Stabilize it；(4) pipeline of confined pressure pump is connected on confined pressure interface, starts confined pressure pump, set confined pressure parameter to be pressurizeed；(5) start axle press pump, set axle to press parameter to be pressurizeed；(6) start vavuum pump to vacuumize, pressure in system is less than 40pa, be then shut off vavuum pump；(7) valve of gas cylinder is opened, gas is passed through to coal sample, treats its adsorption equilibrium；(8) after adsorption equilibrium, data handling system is opened, carries out the setting of parameter, including coal sample length, coal sample diameter, test Gas viscosity, atmospheric pressure；(9) after setting parameter in a data processing system, open valve and start to test；(10) after test terminates, valve is closed；Then axle pressure pressure value is once again set up, next survey is carried out after its adsorption equilibrium Examination；All parameters in test process, including coal sample length, coal sample diameter, gas viscosity, atmospheric pressure, inlet pressure sensing The numerical value of device, the numerical value of outlet pressure sensor, the numerical value of flowmeter and the permeability result that is calculated according to formula can It is automatically saved in Excel file；According to Darcy formula, the formula of gas permeability is：In formula, K-gas permeability；A-coal sample sectional area, calculated according to coal sample diameter；L-coal sample length；P1、P2- coal sample Entrance and outlet pressure；P0- atmospheric pressure；μ-gas viscosity；Q0- flowmeter flow；When measuring permeability, the axle pressure of sample treats coal body internal stability, measures coal sample with after confined pressure application 20 minutes Longitudinal and transverse velocity of wave；Velocity of wave calculation formula is as follows：The P-wave And S velocity of wave calculation formula of ultrasonic wave：Compressional wave：VP=L/tP-t0Shear wave：VS=L/tS-t0In formula：VP- longitudinal wave velocity；VS- transverse wave speed；L-coal sample length；tPThe time that-compressional wave is walked in the sample；tS- horizontal The time that ripple is walked in the sample；t0The zero propagation of-instrument system.
- A kind of 10. application method of coal body permeability test device as claimed in claim 9, it is characterised in that：Oozed in measurement During saturating rate, the axle pressure of sample treats coal body internal stability, measures the longitudinal and transverse velocity of wave of coal sample, measure with after confined pressure application 20 minutes Step is as follows：(1) ultrasonic pulse generator and digital oscilloscope are opened；(2) the compressional wave measurement circuitry of clamper top rock core plug is connected on the interface of ultrasonic pulse generator；(3) the compressional wave measurement circuitry of clamper bottom rock core plug is connected on the interface of digital oscilloscope；(4) control handle on digital oscilloscope is adjusted, until there is preferable oscillogram on digital oscilloscope；(5) operating data processing system record P wave data；(6) measurement circuitry of the compressional wave of clamper top rock core plug is removed, shear wave measurement circuitry is then connected to ultrasonic wave arteries and veins Rush on the interface of generator；(7) measurement circuitry of the compressional wave of clamper bottom rock core plug is removed, shear wave measurement circuitry is then connected to digital oscillography On the interface of device；(8) operating data processing system record shear wave data.
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