CN109682736A - A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient - Google Patents
A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 107
- 239000003245 coal Substances 0.000 title claims abstract description 102
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
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- 229910052734 helium Inorganic materials 0.000 claims description 4
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
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Abstract
The invention discloses a kind of methods of underground gas injection measurement coal seam anisotropy permeability coefficient, comprising the following specific steps 1) establishing test coordinate system on the test section of heading wall surface；2) heading plastic zone radius R is calculated；3) in the coordinate system established in 1), vertical heading wall surface makes a call to an injecting hole, respectively x-axis direction, y-axis direction, xy45 ° of direction at a certain distance from respectively construct the flow measurement hole of a vertical heading wall surface；4) injecting hole and flow measurement hole are subjected to sealing of hole, the identical gas operated device in an aperture is arranged in each hole；5) injecting hole is injected pressurized gas into, after waiting the gas flow in flow measurement hole to stablize, measures the gas flow in each flow measurement hole；6) calculate determine x, on y plane any direction anisotropy permeability coefficient.The present invention realizes the measurement of coal seam anisotropy permeability coefficient, and overcoming conventional method cannot be distinguished the anisotropic deficiency of permeability coefficient.
Description
Technical field
The invention belongs to coal mine gas drainage technical fields, are related to fire damp gas permeability of coal seam test method, especially relate to
And a kind of test method of underground gas injection measurement coal seam anisotropy permeability coefficient.
Background technique
The main component of coal-bed gas is methane, is a kind of Coal Mine Disasters cause calamity gas, while being also a kind of high heating value
Clear energy sources.Mash gas extraction has the social and economic benefit of three aspects: (1) can prevent and treat coal mine gas disaster, be effectively reduced watt
This is protruded and gas explosion is dangerous；(2) gas is a kind of greenhouse gases, is discharged into atmosphere and becomes titanium dioxide after 10 years
Carbon, significantly increases the capture difficulty of carbon dioxide, and underground coal mine mash gas extraction can play GHG emissions mitigation, Environment control
Effect；(3) gas is a kind of Unconventional gas of high heating value, and mash gas extraction can be supplied for China's natural gas and provide supplement,
Meet China's Energy restructuring, encourages the industrial policy of clear energy sources exploitation.2014, gas accident 47 occurred for national coal mine
It rises, dead 266 people, although coal mine gas explosion declined year by year in recent years, gas accident total amount is still larger, great gas thing
Therefore do not contained effectively, mine gas prevention and control situation is still severe.Mash gas extraction is the basic of prevention and treatment Gas Disaster accident
Measure, China in 2014 are total to 17,000,000,000 side of mash gas extraction, 13,300,000,000 side of underground gas extraction, 3,700,000,000 side of ground extraction, underground extraction
It is still the main body of current gas drainage." the coal bed gas action strategic plan " of newest publication in 2015 proposes, arrives the year two thousand twenty, I
State's underground gas extraction amount will reach 20,000,000,000 sides.
Permeability Coefficent in Coal Seam reflects the complexity of Gas Flow, is evaluation gas drainage ability and Gas Outburst danger
Dangerous key parameter is the important evidence of arrangement of drilling in gas drainage design.Coal bed gas extraction engineering practice shows coal
The gas permeability of layer there are anisotropy, i.e. the Gas Flow complexity of coal seam all directions there are bigger difference, thus, measure coal
The permeability coefficient of layer different directions is of crucial importance to gas drainage engineering is rationally designed.
Currently, China's coal-mine security fields mainly use single hole radial direction discharge method to measure Permeability Coefficent in Coal Seam, this side
Method assumes Permeability Coefficent in Coal Seam isotropism, that is, the permeability coefficient for the radial all directions that drill be it is identical, gas is from diameter
It flows to and drills to direction, be only capable of obtaining a comprehensive permeability coefficient, gas flow cannot be distinguished and come from which direction, thus
This method cannot reflect the anisotropic properties of gas permeability of coal seam.Meanwhile this test method needs measurement coal seam original in advance
Beginning gas pressure starts daily gas natural flow after gas pressure is stablized again, generally requires 30 days or more, there is measurement
The deficiency of period length.For the anisotropic properties for reflecting coal seam permeability, once there is researcher to have taken coal in front of driving face
Body image analyzes the fractured zones of coal body using image recognition technology, has statisticallyd analyze the anisotropy of coal seam permeability
Matter, but this method is only capable of the permeability anisotropic properties on reflection coal body surface layer, can not measure the anisotropy inside coal body
Gas permeability distribution.Simultaneously as tunnel wall surface receives the influence adopted, what the image that this method is shot reflected is only adopted
Fractured zones after dynamic, are not the crack of the original coal body in deep, thus cannot reflect each to different of original coal body permeability coefficient
Property property.Chinese patent 201310317597.8 discloses a kind of Permeability Coefficent in Coal Seam test method, shows using injection
Track gas, but also assumed that gas permeability of coal seam isotropism, the anisotropy of Permeability Coefficent in Coal Seam cannot be measured.In addition, this
Kind method starts to calculate flow velocity when injecting fluid and not yet entering the steady flow stage, and unstable flow velocity is calculated as stationary flow
Speed deposits deficiency in principle, while not explaining to pore size, pitch of holes, exists more very much not in the accuracy of test
Foot.
Summary of the invention
The object of the present invention is to provide a kind of methods of underground gas injection measurement coal seam anisotropy permeability coefficient, in solution
State problem.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient, comprising the following specific steps
(1) in the transportation roadway of working seam or air way, selection coal seam is more intact, is crushed without tomography, nothing, influences without drainage holes
One section of heading wall surface, on the test section of heading wall surface establish test coordinate system；
(2) coal core standard specimen is drilled through other than test section region, measures the physical and mechanical parameter of coal, calculates heading plasticity
Area radius R；
(3) in the coordinate system established in (1), it is to spud in a little with co-ordinate zero point, plays a drilling perpendicular to heading wall surface,
Using this hole as injecting hole, the depth of injecting hole is greater than coal road plastic zone radius R and subtracts tunnel radius R0Length；Respectively in x
At a certain distance from axis direction, y-axis direction, xy45 ° of direction, drilling of each construction one perpendicular to heading wall surface, as
The depth in flow measurement hole, flow measurement hole subtracts tunnel radius R not less than coal road plastic zone radius R0Length；
(4) injecting hole and flow measurement hole are subjected to sealing of hole, hole sealing depth is not less than plastic zone radius R and subtracts tunnel radius R0
Length, and be less than the depth in injecting hole or flow measurement hole；It is elastic region, injecting hole and flow measurement on the inside of coal road plastic zone
Hole and elastic region form coal seam gas chamber；When sealing the identical air guide dress in an aperture is arranged in each hole in injecting hole and flow measurement hole
It sets, the gas operated device connection coal seam gas chamber and heading；
(5) injecting hole is injected pressurized gas into, after waiting the gas flow in flow measurement hole to stablize, measures each flow measurement hole
Gas flow；
(6) according to the dynamic viscosity coefficient of compressed gas and gas injection pressure, injecting hole and flow measurement hole line hole back gauge,
Each flow measurement pore pressure force and gas discharge relation of measurement calculate size λ x, λ y, the λ of the permeability coefficient in each measurement direction
xy45, according to λ x, λ y, λ xy45Determine x, on y plane any direction anisotropy permeability coefficient.
Preferably, the gas operated device is air guide iron pipe, and the air guide iron pipe protrudes into the depth of coal seam wall surface and coal road is moulded
Property area radius R subtracts tunnel radius R0Length it is identical.
Preferably, the compressed gas is one of air, carbon dioxide, nitrogen and helium gas.
Preferably, the pressure of the compressed gas is 3-6MPa.
Preferably, the pitch of holes in injecting hole and the direction x, y directional flow measurement hole is 0.5~1m, injecting hole and xy45 ° of side
It is 0.7~1.5m to the pitch of holes in flow measurement hole.
Preferably, injecting hole and the direction x and be 600mm with the pitch of holes in y directional flow measurement hole, injecting hole with
The pitch of holes in xy45 ° of directional flow measurement hole is 600mm.
Preferably, the injecting hole and the bore dia in flow measurement hole are 120mm.
Beneficial effects of the present invention are as follows:
1, the present invention by co-ordinate zero point and x-axis direction, y-axis direction, xy45 ° of direction at a certain distance from drill, pass through note
Stomata injects compressed gas, and the method that flow measurement hole measures gas flow and pressure realizes coal seam anisotropy gas permeability
The measurement of coefficient, overcoming conventional method cannot be distinguished the anisotropic deficiency of permeability coefficient.This test method is simple and easy to do,
Minute is short, without measuring original gas pressure, shortens the waiting time.
2, the depth in injecting hole of the invention and flow measurement hole is not less than coal road plastic zone radius R and subtracts tunnel radius
R0Length hole sealing depth be not less than plastic zone radius R and subtract tunnel radius R0Length, and be less than injecting hole or flow measurement
The depth in hole avoids the influence of tunnel-surrounding plastic zone, fracture area gas leakage to permeability coefficient measurement accuracy；
3, extensive as gas sources such as the air of compressed gas gas source, carbon dioxide, nitrogen, helium, underground gas injection is improved
The engineering measures such as gas drainage rate provide the directly available calculating parameter of reality, therefore applied widely.
4, inflating method disclosed by the invention can get the gas permeability of any direction in heading side wall plane
Coefficient magnitude, the anisotropy permeability coefficient measured using the present invention can calculate the gas injection that various gas injections promote gas pumping engineering
Pressure distribution, gas injection influence distance, gas injection time, assess various gas injection abilities, and design gas injection parameter accordingly, save test
Time and project amount.
Detailed description of the invention
Fig. 1 is injecting hole and flow measurement hole and equipment connection schematic diagram on heading wall surface；
Fig. 2 is the sectional view in Fig. 1 at A-A；
Fig. 3 is injecting hole and flow measurement hole drilling position and scale diagrams on heading wall surface；
Fig. 4 is anisotropy permeability coefficient Mohr's circle schematic diagram.
It is as shown in the figure: 1- heading wall surface, 2- injecting hole, 3- air guide iron pipe, 4- sampling hole, 5- air compressor machine, 6- pressure
Table, 7- flow measurement hole, 8- flowmeter, 9- valve, the elastic region 10-, the coal seam 11- gas chamber, 12- heading, the plastic zone 13-.
Specific embodiment
Embodiment 1
The embodiment of the present invention 1 is further illustrated below in conjunction with attached drawing 1-4.
A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient, comprises the following specific steps that:
(1) in the headings 12 such as the transportation roadway or air way that underground buried depth is H, select coal seam more complete, broken without construction, nothing
One section of heading 12 that is broken, being influenced without drainage holes, the calibration measurement coordinate system on test section heading wall surface 1, with coal seam
It is horizontally to the right the direction x since zero point that certain point of tunnel wall surface 1, which is co-ordinate zero point, is vertically upward the direction y, demarcates survey with this
Position fixing system；
It (2) is to spud in a little with co-ordinate zero point, vertical heading wall surface 1 plays a drilling, bore dia 120mm, and drilling depth L is
10m, using this hole as injecting hole 2.At coordinate x direction 600mm, at the 600mm of the direction y, each construction at xy45 ° of direction 600mm
The drilling of one vertical coal road wall surface, bore dia are 120mm, and drilling depth L is 10m, using this 3 holes as flow measurement
Hole 7.
(3) outside permeability coefficient measuring point at least 50m, it is 120mm that vertical heading wall surface 1, which makes a call to a diameter, and depth L is
The sampling hole 4 of 15m is taken out coal core at hole depth 15m, diameter 50mm is processed into laboratory using hollow core pipe bit,
The standard specimen of high 100mm carries out Rock Mechanics Test, respectively measurement measurement coal core density p, interior cohesive force, internalfrictionangleφ.
The parameter surveyed is substituted into following formula, calculates 12 plastic zone of heading, 13 radius, calculating resulting 13 radius of plastic zone is
7m。
In formula, 13 radius of R --- plastic zone, m；
R0--- 12 radius of heading, m；
ρ --- the density of seam, kg/m3;
G --- acceleration of gravity, N/kg；
H --- measuring point tunnel buried depth, m；
φ --- coal seam internal friction angle, °；
C --- cohesive force in coal seam, MPa.
(4) sealing of hole is carried out in 7 certain depth of injecting hole 2 and flow measurement hole, when sealing of hole, an enclosed iron leg pipe was as leading
Device of air, air guide iron pipe 3 is connected to coal seam gas chamber 11 and 12 space of heading, hole sealing depth are more than that 13 radius R of plastic zone is subtracted
Heading 12R0Length.Injecting hole 2 and flow measurement hole 7 hole depth 10m, 12 radius R of heading0For 1.5m, plastic zone 13
Radius R is 7m, then hole sealing depth L15.5m should be not less than, work as L1When for 6m, coal seam gas chamber 11L2Length is 4m.
(5) air compressor machine 5 is placed in heading 12, using air as gas injection gas source, by 5 gas outlet of air compressor machine and gas injection
Hole 2 connects, and 2 aperture pipeline of injecting hole installs pressure gauge 6, to measure gas injection pressure P1。
Corresponding range can be used in connecting valve 9 and flowmeter 8, flowmeter 8 on the iron pipe in 7 exit of flow measurement hole
Flowmeter 8.
(6) 2 connecting valve 9 of injecting hole is opened, starts air compressor machine 5, from injecting hole 2 to coal seam injecting compressed air, centainly
It flows out after time from three flow measurement holes 7, stablizes after 6 pressure of certain time pressure gauge, reach setting gas injection pressure value, and
When the flow in three flow measurement holes 7 reaches stable, the stationary flow magnitude in each flow measurement hole 7 is measured.
(7) flow value in each hole of measurement is substituted into formula (2), can be calculated each 7 all directions of flow measurement hole
Permeability coefficient λ x, λ y, λ xy45。
In formula, K --- coal seam permeability, m2；
μ --- the dynamic viscosity coefficient of injection gas, Pas；
The hole back gauge of l --- injecting hole 2 and 7 line of flow measurement hole, m；
Bore dia projected area on A --- injecting hole 2 and 7 line direction of flow measurement hole, multiplies equal to bore dia
With hole edge straight line line distance, m2；
Q --- venthole regime flow, m3/min；
The Permeability Coefficent in Coal Seam of λ --- all directions, m2/ (MPa2·d)；
P1--- 2 gas injection pressure of injecting hole, MPa；
Pa--- venthole aperture pressure is equal to atmospheric pressure, 0.1MPa.
Wherein, l is the hole back gauge of injecting hole 2 and each 7 line of flow measurement hole, respectively l12=480mm, l13 =
480mm, l14 =728.53mm。
(8) due to the permeability coefficient λ of each metering orifice all directions of practical measurementx、λy、λxy45It is not necessarily gas permeability
Coefficient main value, and anisotropic permeability coefficient is universal.Continuum theory proves again, when tangential permeability coefficient,
Anisotropic parameters are constantly present maximum main permeability coefficient λyyWith minimum main permeability coefficient λyy, and the two value direction phases
It is mutually vertical.It thus needs to further calculate out maximum main permeability coefficient λ according to measurement resultxxWith minimum main permeability coefficient
λyy, calculation method can be calculated by aforementioned formula (3), (4), (5), that is,
In formula, λn--- permeability coefficient main value has maximum value λxxWith minimum value λyyTwo values；
λτn--- tangential permeability coefficient value；
θ --- λ x and λnThe angle of maximum value is equal to λnThe angle of maximum value and coordinate x forward direction, °；
λx--- the permeability coefficient in the actually measured direction x in underground；
λy--- the permeability coefficient in the actually measured direction y in underground；
λxy45--- the permeability coefficient in xy45 ° of actually measured direction of underground.
Work as λτnWhen=0, two main value sizes of permeability coefficient can be obtained, i.e., maximum main permeability coefficient λxxIt is main saturating with minimum
Gas property coefficient λyy, i.e.,
Obtain two main permeability coefficient λxx、λyyAfterwards, it can be obtained on any inclined-plane according to the permeability coefficient Mohr's circle of formula (6)
Positive permeability coefficient and tangential permeability coefficient, the permeability coefficient Mohr's circle of all directions is as shown in Figure 4.
Embodiment 2
A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient, comprising the following specific steps
(1) in the transportation roadway of working seam or air way, selection coal seam is more intact, is crushed without tomography, nothing, influences without drainage holes
One section of heading wall surface 1, on the test section of heading wall surface 1 establish test coordinate system.
(2) drilling the sampling holes 4 other than test section region, take coal core standard specimen, measure the physical and mechanical parameter of coal, calculate
12 plastic zone of heading, 13 radius R.
(3) in the coordinate system established in (1), it is to spud in a little with co-ordinate zero point, makes a call to one perpendicular to heading wall surface 1
Drilling, using this hole as injecting hole 2, the depth of injecting hole 2 is greater than 13 radius R of coal road plastic zone and subtracts tunnel radius R0Length
Degree；In x-axis direction, y-axis direction, each construction one is hung down at 2 distance 600mm of injecting hole and at xy45 ° of direction 600mm respectively
Directly in the drilling of heading wall surface 1, as flow measurement hole 7, the depth in flow measurement hole 7 is not less than coal road plastic zone 13 half
Diameter R subtracts tunnel radius R0Length；The injecting hole 2 and the diameter in flow measurement hole 7 are 120mm.
(4) injecting hole 2 and flow measurement hole 7 are subjected to sealing of hole, hole sealing depth is not less than 13 radius R of plastic zone and subtracts lane
Road radius R0Length, and be less than the depth in injecting hole 2 or flow measurement hole 7；It is elastic region 10, note on the inside of coal road plastic zone 13
Stomata 2 and flow measurement hole 7 and elastic region 10 form coal seam gas chamber 11；Aperture phase is set when 7 envelope of injecting hole 2 and flow measurement hole
Same air guide iron pipe 3, the air guide iron pipe 3 protrudes into the depth of coal seam wall surface and 13 radius R of coal road plastic zone subtracts tunnel radius
R0Length it is identical, gas operated device connection coal seam gas chamber 11 and heading 12；
(5) compressed gas that pressure is 3-6MPa is injected into injecting hole 2, compressed gas is air, carbon dioxide, nitrogen and helium
One of, after waiting the gas flow in flow measurement hole 7 to stablize, measure the gas flow in each flow measurement hole 7；
(6) according to the hole back gauge of the dynamic viscosity coefficient of compressed gas and gas injection pressure, injecting hole 2 and 7 line of flow measurement hole
From, measurement each 7 pressure of flow measurement hole and gas discharge relation calculate it is each measurement direction permeability coefficient size λx、λy、
λxy45, according to λx、λy、λxy45Determine x, on y plane any direction anisotropy permeability coefficient, specific formula for calculation and meter
Calculation method is the same as embodiment 1.
Embodiment 3
A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient, comprising the following specific steps
(1) in the transportation roadway of working seam or air way, selection coal seam is more intact, is crushed without tomography, nothing, influences without drainage holes
One section of heading wall surface 1, on the test section of heading wall surface 1 establish test coordinate system.
(2) coal core standard specimen is drilled through other than test section region, measures the physical and mechanical parameter of coal, calculates heading
12 plastic zone, 13 radius R.
(3) in the coordinate system established in (1), it is to spud in a little with co-ordinate zero point, makes a call to one perpendicular to heading wall surface 1
Drilling, using this hole as injecting hole 2, the depth of injecting hole 2 is greater than 13 radius R of coal road plastic zone and subtracts tunnel radius R0Length
Degree；Respectively x-axis direction, y-axis direction, xy45 ° of direction at a certain distance from, each construction one is perpendicular to heading wall surface 1
Drilling, as flow measurement hole 7, the depth in flow measurement hole 7 subtracts tunnel radius R not less than 13 radius R of coal road plastic zone0
Length；
(4) injecting hole 2 and flow measurement hole 7 are subjected to sealing of hole, hole sealing depth is not less than 13 radius R of plastic zone and subtracts tunnel half
Diameter R0Length, and be less than the depth in injecting hole 2 or flow measurement hole 7；It is elastic region 10, injecting hole on the inside of coal road plastic zone 13
2 and flow measurement hole 7 and elastic region 10 form coal seam gas chamber 11；Each hole is arranged one when 7 envelope of injecting hole 2 and flow measurement hole
The identical gas operated device in aperture, the gas operated device connection coal seam gas chamber 11 and heading 12；
(5) injecting hole 2 is injected pressurized gas into, after waiting the gas flow in flow measurement hole 7 to stablize, measures each flow measurement hole
7 gas flow；
(6) according to the hole back gauge of the dynamic viscosity coefficient of compressed gas and gas injection pressure, injecting hole 2 and 7 line of flow measurement hole
From, measurement each 7 pressure of flow measurement hole and gas discharge relation calculate it is each measurement direction permeability coefficient size λx、λy、
λxy45, according to λx、λy、λxy45Determine x, on y plane any direction anisotropy permeability coefficient, specific formula for calculation and meter
Calculation method is the same as embodiment 1.
Embodiment 4
A kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient, if measurement coal road moves towards the anisotropy in direction
When permeability coefficient, the measurement coordinate system of z, y plane, i.e., another level side can be established in 12 driving face coal wall of heading
To for the direction z, being vertically upward still the direction y, method is to replace the direction x with the direction z.13 range of plastic zone is with vertical coal seam lane
12 driving face wall direction of road calculates, and measuring method, calculation formula and calculation method are same as Example 1.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (7)
1. a kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient, which is characterized in that including walking in detail below
It is rapid:
(1) in the transportation roadway of working seam or air way, selection coal seam is more intact, is crushed without tomography, nothing, influences without drainage holes
One section of heading wall surface, on the test section of heading wall surface establish test coordinate system；
(2) coal core standard specimen is drilled through other than test section region, measures the physical and mechanical parameter of coal, calculates heading plasticity
Area radius R；
(3) in the coordinate system established in (1), it is to spud in a little with co-ordinate zero point, plays a drilling perpendicular to heading wall surface,
Using this hole as injecting hole, the depth of injecting hole is greater than coal road plastic zone radius R and subtracts tunnel radius R0Length；Respectively in x
At a certain distance from axis direction, y-axis direction, xy45 ° of direction, drilling of each construction one perpendicular to heading wall surface, as
The depth in flow measurement hole, flow measurement hole subtracts tunnel radius R not less than coal road plastic zone radius R0Length；
(4) injecting hole and flow measurement hole are subjected to sealing of hole, hole sealing depth is not less than plastic zone radius R and subtracts tunnel radius R0
Length, and be less than the depth in injecting hole or flow measurement hole；It is elastic region, injecting hole and flow measurement on the inside of coal road plastic zone
It is coal seam gas chamber that hole and elastic region, which form space,；One aperture is identical leads for each hole setting when sealing for injecting hole and flow measurement hole
Device of air, the gas operated device connection coal seam gas chamber and heading；
(5) injecting hole is injected pressurized gas into, after waiting the gas flow in flow measurement hole to stablize, measures each flow measurement hole
Gas flow；
(6) according to the dynamic viscosity coefficient of compressed gas and gas injection pressure, injecting hole and flow measurement hole line hole back gauge,
Measurement each flow measurement pore pressure force and gas discharge relation calculate it is each measurement direction permeability coefficient size,, according to,
Determine x, on y plane any direction anisotropy permeability coefficient.
2. a kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient according to claim 1, feature
It is, the gas operated device is air guide iron pipe, and the air guide iron pipe protrudes into the depth of coal seam wall surface and coal road plastic zone radius R subtracts
Remove tunnel radius R0Length it is identical.
3. a kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient according to claim 1, feature
It is, the compressed gas is one of air, carbon dioxide, nitrogen and helium gas.
4. a kind of method of underground gas injection measurement coal seam anisotropy permeability coefficient according to claim 1, feature
It is, the pressure of the compressed gas is 3-6MPa.
5. any one right will require a kind of underground gas injection to measure coal seam anisotropy ventilative according to claim 1
The method of property coefficient, which is characterized in that the pitch of holes in injecting hole and the direction x, y directional flow measurement hole is 0.5~1m, injecting hole
Pitch of holes with xy45 ° of directional flow measurement hole is 0.7~1.5m.
6. to require a kind of underground gas injection to measure coal seam anisotropy saturating for any one right in -5 according to claim 1
The method of gas property coefficient, which is characterized in that injecting hole is 600mm with the direction x and with the pitch of holes in y directional flow measurement hole,
Injecting hole and the pitch of holes in xy45 ° of directional flow measurement hole are 600mm.
7. to require a kind of underground gas injection to measure coal seam anisotropy saturating for any one right in -5 according to claim 1
The method of gas property coefficient, which is characterized in that the injecting hole and the bore dia in flow measurement hole are 120mm.
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