CN106645630A - Tester for simulating change of gas permeability of coal seam caused by water drainage and permeability-increasing method - Google Patents
Tester for simulating change of gas permeability of coal seam caused by water drainage and permeability-increasing method Download PDFInfo
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- CN106645630A CN106645630A CN201710089316.6A CN201710089316A CN106645630A CN 106645630 A CN106645630 A CN 106645630A CN 201710089316 A CN201710089316 A CN 201710089316A CN 106645630 A CN106645630 A CN 106645630A
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- 239000003245 coal Substances 0.000 title claims abstract description 129
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 230000035699 permeability Effects 0.000 title claims abstract description 38
- 230000008859 change Effects 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims abstract description 68
- 239000011521 glass Substances 0.000 claims abstract description 43
- 230000000007 visual effect Effects 0.000 claims abstract description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 87
- 230000002209 hydrophobic effect Effects 0.000 claims description 60
- 238000009792 diffusion process Methods 0.000 claims description 38
- 238000005070 sampling Methods 0.000 claims description 24
- 230000005012 migration Effects 0.000 claims description 15
- 238000013508 migration Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 238000004088 simulation Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 10
- 238000009825 accumulation Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 9
- 239000003034 coal gas Substances 0.000 claims description 8
- 238000003795 desorption Methods 0.000 claims description 8
- 230000008520 organization Effects 0.000 claims description 8
- 230000037361 pathway Effects 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000001028 reflection method Methods 0.000 claims description 6
- 230000002401 inhibitory effect Effects 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 6
- 239000011435 rock 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/222—Solid fuels, e.g. coal
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a tester for simulating the change of gas permeability of a coal seam caused by water drainage and a permeability-increasing method. The tester comprises a main framework, a gas application mechanism, a gas release control mechanism, a water drainage mechanism, and a dynamic visual observation mechanism; the main framework mainly comprises a square chamber, the square chamber is connected to a chamber cover through bolts, and the middle of the chamber cover is provided with transparent bulletproof glass; the gas application mechanism is located on the left side of the main framework; the gas release control mechanism is located on the right side of the main framework; the water drainage mechanism is located on the upper side of the main framework; the dynamic visual observation mechanism is located on the chamber cover of the front side of the main framework; the main framework, the gas application mechanism, the gas release control mechanism and the water drainage mechanism are connected through pipelines, and the dynamic visual observation mechanism is fixed on the front side of the main framework by bolts. The invention can provide good simulative experimental research equipment for the research on the influence of water drainage on the gas permeability of coal seams.
Description
Technical field
The present invention relates to hydrophobic change gas permeability of coal seam simulation test device and anti-reflection method.
Background technology
Gas permeability of coal seam has a significant impact to the occurrence status of gas, flow behavior in coal body, and coal body and its preservation are enclosed
Pressure water in rock will have a major impact effect to the gas permeability in coal seam.The presence of pressure water in coal seam not only affects coal to gas
Adsorption and desorption, can also block the passage that gas flows in coal micropore, capillarity, and then shape are produced in coal body hole
Into capillary resistance, hinder gas and enter inside micropore of producing coal.Therefore, dredge having in pressure water and roof and floor country rock in coal seam
Pressure water will likely to a great extent change the gas permeability in coal seam.And at present the research to gas permeability of coal seam is not all accounted for mostly
To the hydrophobic impact to gas permeability of coal seam, related laboratory analog simulation device is more rarely reported.Therefore, grasp is thought over
The hydrophobic affecting laws to gas permeability of coal seam, develop reliable simulation test device and are particularly important.
The content of the invention
It is an object of the invention to overcome existing dredge coal seam and top board pressure water to gas permeability of coal seam influence research not
Foot, there is provided a kind of hydrophobic change gas permeability of coal seam simulation test device and anti-reflection method, realization has pressure to dredging coal seam and top board
The analog simulation research that water affects on gas permeability of coal seam, for site safety is effectively ensured offer guidance is efficiently produced.
For achieving the above object, the present invention is adopted the following technical scheme that：
A kind of hydrophobic change gas permeability of coal seam simulation test device, including main body frame, gas applying mechanism, Methane Diffusion
Controlling organization, drainage mechanism, dynamic visual sampling mechanism；The main body frame is mainly made up of square cavity, square cavity with
Cavity lid is bolted, and transparent bulletproof glass is provided with the middle of cavity lid；The gas applying mechanism is located at body frame
Frame left side, including high pressure gas tank, gas pressure table, gas switch, Gas-Flow gauge, pipeline；The Methane Diffusion control machine
Structure is located at main body frame right side, including gas switch, Gas-Flow gauge, gas pressure table, pipeline；The drainage mechanism is located at master
Body frame upper side, including water tank, high-pressure hydraulic pump, water pressure gauge, switch, pipeline；The dynamic visual sampling mechanism is located at body frame
On cavity lid on front side of frame, including 12 screwed holes on transparent bulletproof glass and above, by the sealing for adjusting screwed hole
State can dynamic observation main body frame inner hydrophobic state；The main body frame, gas applying mechanism, Methane Diffusion control machine
Structure, drainage mechanism are attached by pipeline, and dynamic visual sampling mechanism is bolted on main body frame front side.
The main body frame includes square cavity, air inlet, gas outlet, water inlet, cavity lid, O-ring seal, air inlet
Mouth, gas outlet are located at the left and right sides of square cavity, and water inlet is located at the upside of square cavity, and cavity lid is located at square cavity
Front side, square cavity outer and cavity lid outer be equipped with bolt hole, and square cavity is bolted with cavity lid,
O-ring seal is located in the middle of square cavity and cavity lid.
The cavity lid is provided with dynamic visual sampling mechanism, the dynamic visual sampling mechanism by upper and lower frames, thoroughly
Bright bulletproof glass is combined, and transparent bulletproof glass is fixed between upper and lower frames.
The transparent bulletproof glass is provided with the equally distributed screwed hole of four rows, and often row is provided with three screwed holes, each spiral shell
Pit is furnished with corresponding bolt, and the bolt can carry out dynamic sealing and deblocking to screwed hole.
The gas applying mechanism includes high pressure gas tank, gas pressure table, gas switch, Gas-Flow gauge, pipeline, institute
State high pressure gas tank, gas pressure table, gas switch, Gas-Flow gauge by pipeline dependent Series and with main body frame on the left of
Joint on air inlet is attached.
The Methane Diffusion mechanism includes gas switch, Gas-Flow gauge, gas pressure table, pipeline；The gas switch,
Gas-Flow gauge, gas pressure table are serially connected by pipeline, and are attached with the joint on the gas outlet of main body frame right side.
The drainage mechanism includes water tank, high-pressure hydraulic pump, water pressure gauge, switch, pipeline, the water tank, high-pressure hydraulic pump, hydraulic pressure
Table, switch, it is serially connected by pipeline, and is attached with the joint on the water inlet of main body frame upside, by high-pressure hydraulic pump
During water in water tank can be pumped into the sample in main body frame.
The dynamic visual sampling mechanism is located on cavity lid, including transparent bulletproof glass and screwed hole above, is led to
The sealing state for overregulating screwed hole can dynamic observation main body frame inner hydrophobic state.
Hydrophobic change gas permeability of coal seam anti-reflection method, comprises the steps：
It is prepared by a, sample：Square cavity is kept flat, square cavity vertical inlet mouth direction is divided into two squares with hard paper
Shape space, near the space of water inlet 1/4 sand is filled up, and in addition coal dust is filled up in 3/4 space, and hard paper is taken out after being compacted into,
Then it is press-formed.
B, sealing assembling：Dynamic visual sampling mechanism is assemblied on square cavity, is sealed using O-ring seal,
And dynamic visual sampling mechanism is agreed with square cavity by hexagon socket head cap screw, the screwed hole on dynamic visual sampling mechanism
All sealed up with hexagon socket head cap screw, and by air inlet connections with the connection of gas applying mechanism, gas outlet joint and Methane Diffusion
Mechanism connects, the connection of water inlet connection drainage mechanism, and is examined in each sealing joint.
C, ventilation absorption：Air inlet switch is opened, gas outlet switch is closed, the logical gas of sample 8 hours in square shaped cavity
More than, after making the abundant adsorption gas of sample, close air inlet.
D, water filling：Make square cavity water inlet upward, open water inlet switch, the sample pressure water into square cavity, while
Gas vent firedamp drainage is opened, coverage of the roof water to sample is observed by transparent bulletproof glass.
E, hydrophobic anti-reflection：The present invention can be using three kinds of methods to sample hydrophobic anti-reflection：
(1) roof water release is dredged anti-reflection：Water inlet is closed, transparent bulletproof glass upper end the on cavity lid is opened successively
One discharge water hole, hydrophobic release is carried out to sample top board, at the same monitor gas outlet at Gas-Flow gauge Methane Diffusion parameter (watt
This diffuses speed, accumulation Methane Diffusion amount).By dredging top board pressure water, reduce top board pressure water and flow into underlying seam, closure
Migration pathway of the gas in coal micropore, crack；Meanwhile, the achievable local release to aqueous coal seam of roof water is dredged,
Under the ordering about of barometric gradient, promotion is adsorbed in the desorption of mash gas in coal body, is converted into free gas；Unload in addition, hydrophobic to top board
Pressure can increase the smoothness of gas migration pathway, connectedness in coal seam, migrate in coal seam for gas and provide condition.
(2) coal seam water release is dredged anti-reflection：Transparent bulletproof glass upper end first row dewatering orifice on cavity lid is closed, according to
Various combination mode, opens successively the second to four discharge pore on transparent bulletproof glass, carries out hydrophobic release to sample coal seam, together
When monitor the Methane Diffusion parameter (Methane Diffusion speed, accumulation Methane Diffusion amount) of Gas-Flow gauge at gas outlet and air vent.
By dredging coal seam pressure water, reduce the inhibitory action that water is desorbed to coal gas, promotion is adsorbed in the gas of coal body and is converted into
Free gas, increase free gas amount and methane pressure gradient, accelerate migration of the gas in coal seam；Meanwhile, dredging coal seam has
Pressure water flows out the water in the constitution pores and crack of coal seam, the passage that dredging gas flows in micropore, crack, reduction micropore,
The appearance for hindering gas migration moisture film is formed in fissured structure, increases the gas permeability in coal seam；In addition, dredge coal seam by local having
Pressure water, makes non-hydrophobic part coal body form pressure differential with hydrophobic part coal body, promotes non-hydrophobic part coal body to produce pressure break anti-reflection
Effect, increases the gas permeability in coal seam.
(3) coalbed from hydraulic is anti-reflection：Gas vent is closed, by the air vent in the middle part of transparent bulletproof glass on cavity lid
Drill in coal seam, then, fracturing screen casing is inserted in drilling and sealing of hole, the external high-pressure hydraulic pump of fracturing screen casing, to sample coal seam
Hydrofracturing is carried out anti-reflection, while observing coal seam fracturing situation by transparent bulletproof glass；After the abundant fracturing in coal seam, close and cause
Screen casing switch is split, air vent around fracturing screen casing is opened, to the hydrophobic release in coal seam；After a period of time, sieve in gas vent and fracturing
Negative pressure extraction pump, gas in negative pressure extraction coal seam are connect around pipe at air vent, while monitoring Gas-Flow gauge on extraction pipeline
Methane Diffusion parameter (Methane Diffusion speed, accumulation Methane Diffusion amount).By increasing gas permeability of coal seam to coalbed from hydraulic, so
Hydrophobic release afterwards, realizes promoting coal gas desorption, seepage flow, reaches the purpose anti-reflection to coal seam.
F, data observation：During to sample hydrophobic anti-reflection, by transparent bulletproof glass and Methane Diffusion controlling organization
Real-time monitored is hydrophobic to affect situation to gas permeability of coal seam.
Beneficial effects of the present invention：
1st, the present invention can dredge pressure water in coal seam by adjusting the switch simulation of water inlet, dewatering orifice and air vent, pass through
Transparent bulletproof glass and Gas-Flow gauge real-time monitored is hydrophobic affects situation to gas permeability of coal seam, is hydrophobic to gas permeability of coal seam
Research provides experimental study equipment that is good and emulating.
2nd, cavity lid is provided with transparent bulletproof glass, can the coverage of dynamic visual observation roof water and dredging for sample
Regimen condition.
3rd, transparent bulletproof glass is provided with four row's screwed holes on cavity lid, it is gradable progressively hydrophobic to sample in cavity and
Gas is diffused, while pressure break pipe can be inserted to sample by the screwed hole, it is anti-reflection to sample pressure break.
Description of the drawings
Fig. 1 is the hydrophobic front view for changing gas permeability of coal seam simulation test device of the present invention；
Fig. 2 is the top view of the hydrophobic main body frame for changing gas permeability of coal seam simulation test device of the present invention；
Fig. 3 is the exploded view of the hydrophobic main body frame for changing gas permeability of coal seam simulation test device of the present invention；
In figure：1-lower frame；2-upper side frame；3-transparent bulletproof glass；4-air inlet connections；5-water inlet connection；
6-gas outlet joint；7th, 8,9,10,11,12,13,14,15,16,17,18-frame fixes hexagon socket head cap screw；
19th, 20,21-discharge water screwed hole；22nd, 23,24,25,26,27,28,29,30-deflation screwed hole；31-square cavity；32—
High pressure gas tank；33-gas pressure table；34-pipeline；35-gas switch；36-Gas-Flow gauge；.37-water tank；38—
Pipeline；39-high-pressure hydraulic pump；40-water pressure gauge；41-gas switch；42-gas pressure table；43-pipeline；44-gas is opened
Close；45-Gas-Flow gauge；46-flexible pipe.
Specific embodiment
Below in conjunction with the accompanying drawings, specific implementation of the patent mode is further described.
As shown in Figure 1, Figure 2 and Figure 3, a kind of hydrophobic change gas permeability of coal seam simulation test device, including main body frame, watt
This applying mechanism, Methane Diffusion controlling organization, drainage mechanism, dynamic visual sampling mechanism；The main body frame is mainly by square
Cavity 31 is constituted, and cavity 31 is bolted 7-18 with cavity lid, and transparent bulletproof glass 3 is provided with the middle of cavity lid；Institute
State transparent bulletproof glass 3 and be provided with four row screwed hole 19-30, first row screwed hole is dewatering orifice 19-21, and two to four rows are deflation
Hole 22-30；The cavity left and right side is respectively equipped with air inlet, gas outlet, and cavity upper side is provided with water inlet 5；The gas
Diffuse controlling organization to be connected with gas outlet, air vent 22-30 by pipeline.
The main body frame includes square cavity 31, and 31 or so two opposite flank centers of the square cavity are respectively equipped with
Air inlet, gas outlet, the upper side center of square cavity 31 is provided with water inlet；Square cavity outer is equipped with cavity lid outer
Bolt hole, cavity 31 is connected with cavity lid by bolt 7-18.The cavity lid is provided with dynamic visual sampling mechanism, institute
State dynamic visual sampling mechanism to be combined by upper and lower frames 1,2, transparent bulletproof glass 3, transparent bulletproof glass 3 is fixed on up and down
Between framework 1,2.The transparent bulletproof glass is provided with the equally distributed screwed hole 19-30 of four rows, and often row is provided with three screw threads
Hole 19-30；The screwed hole 19-30 can connecting bolt sealed.
The gas applying mechanism includes high pressure gas tank 32, gas pressure table 33, pipeline 34, pipeline switch 35 and gas
Flowmeter 36；The high pressure gas tank 32, gas pressure table 33, pipeline 34, pipeline switch 35 and Gas-Flow gauge 36 are by pipe
Road 34 is connected with the air inlet connections 4 of square cavity 31.
The Methane Diffusion controlling organization includes gas switch 43, Gas-Flow gauge 44, gas pressure table 45, flexible pipe 46；
The gas switch 43, Gas-Flow gauge 44, gas pressure table 45, flexible pipe 46 are connect by pipeline 34 with the gas outlet of square cavity 31
6 are connected.
The drainage mechanism includes water tank 37, pipeline 38, high-pressure hydraulic pump 39, water pressure gauge 40 and switch 41；The water tank 37,
Pipeline 38, high-pressure hydraulic pump 39, water pressure gauge 40 and switch 41 are connected by pipeline with water inlet connection 5.The drainage mechanism is by height
Water pump 39 pumps into the water in water tank 37 in square cavity 31, such that it is able to observe the hydrophobic feelings of sample in square cavity 31
Condition.
Hydrophobic change gas permeability of coal seam anti-reflection method, using above-mentioned experimental rig, comprises the steps：
It is prepared by a, sample：Square cavity 31 is kept flat, the vertical inlet mouth direction of square cavity 31 is divided into two with hard paper
Individual coffin, near the space of water inlet 1/4 sand is filled up, and in addition coal dust is filled up in 3/4 space, and cardboard is taken out after being compacted into
Piece, is then press-formed.
B, sealing assembling：Dynamic visual sampling mechanism is assemblied on square cavity, is sealed using O-ring seal,
And dynamic visual sampling mechanism is agreed with square cavity 31 by hexagon socket head cap screw, the screw thread on dynamic visual sampling mechanism
Hole is all sealed up with hexagon socket head cap screw, and by air inlet connections 4 with the connection of gas applying mechanism, gas outlet joint 6 and gas
Releasing device connects, and water inlet connection 5 connects with drainage mechanism, and is examined in each sealing joint.
C, ventilation absorption：Air inlet switch 35 is opened, gas outlet switch 42 is closed, the logical gas of sample in square shaped cavity 31
More than 8 hours, after making the abundant adsorption gas of sample, close air inlet.
D, water filling：Make the water inlet of square cavity 31 upward, open water inlet switch 41, the sample pressure into square cavity 31
Water, while opening the firedamp drainage of gas vent 42, by transparent bulletproof glass 3 coverage of the roof water to sample is observed.
E, hydrophobic anti-reflection：The present invention can be using three kinds of methods to sample hydrophobic anti-reflection：
(1) roof water release is dredged anti-reflection：Water inlet is closed, transparent bulletproof glass upper end the on cavity lid is opened successively
One discharge water hole 19-21, to sample top board hydrophobic release is carried out, while monitoring the Methane Diffusion ginseng of Gas-Flow gauge at gas outlet
Number (Methane Diffusion speed, accumulation Methane Diffusion amount).By dredging top board pressure water, reduce top board pressure water and flow into lower coal
Layer, blocks migration pathway of the gas in coal micropore, crack；Meanwhile, dredge the achievable local to aqueous coal seam of roof water
Release, under the ordering about of barometric gradient, promotion is adsorbed in the desorption of mash gas in coal body, is converted into free gas；In addition, to top board
Hydrophobic release can increase the smoothness of gas migration pathway, connectedness in coal seam, migrate in coal seam for gas and provide condition.
(2) coal seam water release is dredged anti-reflection：Close the upper end first row dewatering orifice 19- of transparent bulletproof glass 3 on cavity lid
21, according to various combination mode, the second to four discharge pore 22-30 on transparent bulletproof glass 3 is opened successively, sample coal seam is entered
The hydrophobic release of row, while monitoring Methane Diffusion parameter (Methane Diffusion speed, the accumulation of Gas-Flow gauge at gas outlet and air vent
Methane Diffusion amount).By dredging coal seam pressure water, reduce the inhibitory action that water is desorbed to coal gas, promotion is adsorbed in coal body
Gas be converted into free gas, increase free gas amount and methane pressure gradient, accelerate migration of the gas in coal seam；Together
When, dredging coal seam pressure water flows out the water in the constitution pores and crack of coal seam, dredges gas in leading to that micropore, crack are flowed
Road, reduces micropore, the interior gas permeability for forming the appearance for hindering gas migration moisture film, increasing coal seam of fissured structure；In addition, passing through
Coal seam pressure water is dredged in local, makes non-hydrophobic part coal body form pressure differential with hydrophobic part coal body, promotes non-hydrophobic part coal
Body produces pressure break antireflection, increases the gas permeability in coal seam.
(3) coalbed from hydraulic is anti-reflection：Gas vent 6 is closed, by transparent bulletproof glass middle part 22-27 on cavity lid
Air vent drills in coal seam, then, fracturing screen casing is inserted in drilling and sealing of hole, the external high-pressure hydraulic pump of fracturing screen casing, to examination
It is anti-reflection that sample coal seam carries out hydrofracturing, while observing coal seam fracturing situation by transparent bulletproof glass；After the abundant fracturing in coal seam,
Fracturing screen casing switch is closed, air vent around fracturing screen casing is opened, to the hydrophobic release in coal seam；After a period of time, in the He of gas vent 6
Negative pressure extraction pump, gas in negative pressure extraction coal seam are connect around fracturing screen casing at air vent, while monitoring Gas-Flow on extraction pipeline
The Methane Diffusion parameter (Methane Diffusion speed, accumulation Methane Diffusion amount) of gauge.It is saturating by increasing coal seam to coalbed from hydraulic
Gas, then hydrophobic release is realized promoting coal gas desorption, seepage flow, reaches the purpose anti-reflection to coal seam.
F, data observation：During to sample hydrophobic anti-reflection, by transparent bulletproof glass 3 and Methane Diffusion controlling organization
Real-time monitored is hydrophobic to affect situation to gas permeability of coal seam.
The operation principle of the present invention：(1) by dredging pressure water, reduce the inhibitory action that water is desorbed to coal gas, promote
The gas for entering to be adsorbed in coal body is converted into free gas, increases free gas amount and methane pressure gradient, accelerates gas in coal seam
In migration.
(2) by dredging pressure water, flow out the water in the constitution pores and crack of coal seam, dredging gas is in micropore, crack
The passage of flowing, reduces micropore, the interior gas permeability for forming the appearance for hindering gas migration moisture film, increasing coal seam of fissured structure；
By dredging pressure water, the local release to aqueous coal seam, under the ordering about of barometric gradient, the gas being adsorbed in coal body are realized
Desorption, is converted into free gas；The smoothness of gas migration pathway in coal seam, connection can be increased the hydrophobic release of coal body simultaneously
Property, migrate in coal seam for gas and condition is provided.
(3) pressure water is dredged by local, makes non-hydrophobic part form pressure differential with hydrophobic part, promote non-hydrophobic part
Pressure break antireflection is produced, increases the gas permeability in coal seam.
(4) by increasing coalbed from hydraulic gas permeability of coal seam, then hydrophobic release is realized promoting coal gas solution
Suction, seepage flow, reach the purpose anti-reflection to coal seam.
Presently preferred embodiments of the present invention is the foregoing is only, not with the present invention to limit, all essences in the present invention
Any modification, equivalent and the improvement made within god and principle such as changes bulletproof glass upper screwed hole quantity, all should wrap
It is contained within protection scope of the present invention.
Claims (9)
1. one kind is hydrophobic changes gas permeability of coal seam simulation test device, including main body frame, gas applying mechanism, Methane Diffusion control
Mechanism processed, drainage mechanism, dynamic visual sampling mechanism；The main body frame is mainly made up of square cavity, square cavity and chamber
Body lid is bolted, and transparent bulletproof glass is provided with the middle of cavity lid；The gas applying mechanism is located at main body frame
Left side, including high pressure gas tank, gas pressure table, gas switch, Gas-Flow gauge, pipeline；The Methane Diffusion controlling organization
On the right side of main body frame, including gas switch, Gas-Flow gauge, gas pressure table, pipeline；The drainage mechanism is located at main body
Frame upper side, including water tank, high-pressure hydraulic pump, water pressure gauge, switch, pipeline；The dynamic visual sampling mechanism is located at main body frame
On the cavity lid of front side, including 12 screwed holes on transparent bulletproof glass and above, by the sealing shape for adjusting screwed hole
State can dynamic observation main body frame inner hydrophobic state；The main body frame, gas applying mechanism, Methane Diffusion controlling organization,
Drainage mechanism is attached by pipeline, and dynamic visual sampling mechanism is bolted on main body frame front side.
2. main body frame described in includes square cavity, air inlet, gas outlet, water inlet, cavity lid, O-ring seal, air inlet
Mouth, gas outlet are located at the left and right sides of square cavity, and water inlet is located at the upside of square cavity, and cavity lid is located at square cavity
Front side, square cavity outer and cavity lid outer be equipped with bolt hole, and square cavity is bolted with cavity lid,
O-ring seal is located in the middle of square cavity and cavity lid.
3. cavity lid described in is provided with dynamic visual sampling mechanism, and the dynamic visual sampling mechanism is by upper and lower frames, transparent
Bulletproof glass is combined, and transparent bulletproof glass is fixed between upper and lower frames.
4. transparent bulletproof glass described in is provided with the equally distributed screwed hole of four rows, and often row is provided with three screwed holes, each screw thread
Hole is furnished with corresponding bolt, and the bolt can carry out dynamic sealing and deblocking to screwed hole.
5. gas applying mechanism described in includes high pressure gas tank, gas pressure table, gas switch, Gas-Flow gauge, pipeline, described
High pressure gas tank, gas pressure table, gas switch, Gas-Flow gauge by pipeline dependent Series and with main body frame on the left of enter
Joint on gas port is attached.
6. Methane Diffusion mechanism described in includes gas switch, Gas-Flow gauge, gas pressure table, pipeline；The gas switch, watt
This flowmeter, gas pressure table are serially connected by pipeline, and are attached with the joint on the gas outlet of main body frame right side.
7. drainage mechanism described in includes water tank, high-pressure hydraulic pump, water pressure gauge, switch, pipeline, the water tank, high-pressure hydraulic pump, hydraulic pressure
Table, switch, it is serially connected by pipeline, and is attached with the joint on the water inlet of main body frame upside, by high-pressure hydraulic pump
During water in water tank can be pumped into the sample in main body frame.
8. dynamic visual sampling mechanism described in is located on cavity lid, including transparent bulletproof glass and screwed hole above, is passed through
The sealing state for adjusting screwed hole can dynamic observation main body frame inner hydrophobic state.
9. hydrophobic change gas permeability of coal seam anti-reflection method, comprises the steps：
It is prepared by a, sample：Square cavity is kept flat, square cavity vertical inlet mouth direction is divided into two rectangle skies with hard paper
Between, sand is filled up near the space of water inlet 1/4, in addition coal dust is filled up in 3/4 space, hard paper is taken out after being compacted into, then
Extrusion forming.
B, sealing assembling：Dynamic visual sampling mechanism is assemblied on square cavity, is sealed using O-ring seal, and
Dynamic visual sampling mechanism is agreed with square cavity by hexagon socket head cap screw, the screwed hole whole on dynamic visual sampling mechanism
Sealed up with hexagon socket head cap screw, and by air inlet connections with the connection of gas applying mechanism, gas outlet joint and Methane Diffusion mechanism
Connection, the connection of water inlet connection drainage mechanism, and it is examined in each sealing joint.
C, ventilation absorption：Air inlet switch is opened, gas outlet switch is closed, the logical gas of sample more than 8 hours in square shaped cavity,
After making the abundant adsorption gas of sample, air inlet is closed.
D, water filling：Make square cavity water inlet upward, open water inlet switch, the sample pressure water into square cavity, while opening
Gas vent firedamp drainage, by transparent bulletproof glass coverage of the roof water to sample is observed.
E, hydrophobic anti-reflection：The present invention can be using three kinds of methods to sample hydrophobic anti-reflection：
(1) roof water release is dredged anti-reflection：Water inlet is closed, transparent bulletproof glass upper end first row on cavity lid is opened successively
Dewatering orifice, to sample top board hydrophobic release is carried out, while monitoring the Methane Diffusion parameter of Gas-Flow gauge at gas outlet, (gas is put
Scattered speed, accumulation Methane Diffusion amount).By dredging top board pressure water, reduce top board pressure water and flow into underlying seam, block gas
Migration pathway in coal micropore, crack；Meanwhile, the achievable local release to aqueous coal seam of roof water is dredged, in pressure
Under the ordering about of gradient, promotion is adsorbed in the desorption of mash gas in coal body, is converted into free gas；In addition, can to the hydrophobic release of top board
Increase smoothness, the connectedness of gas migration pathway in coal seam, migrate in coal seam for gas and condition is provided.
(2) coal seam water release is dredged anti-reflection：Transparent bulletproof glass upper end first row dewatering orifice on cavity lid is closed, according to difference
Combination, opens successively the second to four discharge pore on transparent bulletproof glass, hydrophobic release is carried out to sample coal seam, while prison
Measure the Methane Diffusion parameter (Methane Diffusion speed, accumulation Methane Diffusion amount) of Gas-Flow gauge at gas port and air vent.Pass through
Coal seam pressure water is dredged, reduces the inhibitory action that water is desorbed to coal gas, promote the gas for being adsorbed in coal body to be converted into free
Gas, increases free gas amount and methane pressure gradient, accelerates migration of the gas in coal seam；Meanwhile, dredge coal seam pressure water
The water in the constitution pores and crack of coal seam is flowed out, the passage that gas flows in micropore, crack is dredged, micropore, crack is reduced
The appearance for hindering gas migration moisture film is formed in structure, increases the gas permeability in coal seam；In addition, dredging coal seam by local has pressure
Water, makes non-hydrophobic part coal body form pressure differential with hydrophobic part coal body, promotes non-hydrophobic part coal body to produce the anti-reflection effect of pressure break
Should, increase the gas permeability in coal seam.
(3) coalbed from hydraulic is anti-reflection：Gas vent is closed, by the air vent in the middle part of transparent bulletproof glass on cavity lid to coal
Drill in layer, then, fracturing screen casing is inserted in drilling and sealing of hole, the external high-pressure hydraulic pump of fracturing screen casing is carried out to sample coal seam
Hydrofracturing is anti-reflection, while observing coal seam fracturing situation by transparent bulletproof glass；After the abundant fracturing in coal seam, fracturing sieve is closed
Pipe is switched, and air vent around fracturing screen casing is opened, to the hydrophobic release in coal seam；After a period of time, in gas vent and fracturing screen casing week
Enclose and connect at air vent negative pressure extraction pump, gas in negative pressure extraction coal seam, while monitoring the gas of Gas-Flow gauge on extraction pipeline
Diffuse parameter (Methane Diffusion speed, accumulation Methane Diffusion amount).By increasing gas permeability of coal seam to coalbed from hydraulic, then dredge
Water release, realizes promoting coal gas desorption, seepage flow, reaches the purpose anti-reflection to coal seam.
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Application publication date: 20170510 |