CN105114055B - A kind of coal bed gas well mining output coal dust transported simulation test method - Google Patents
A kind of coal bed gas well mining output coal dust transported simulation test method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 93
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- 238000010998 test method Methods 0.000 title claims abstract description 28
- 238000005065 mining Methods 0.000 title claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 91
- 238000012360 testing method Methods 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
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Abstract
The invention discloses a kind of coal bed gas well mining output coal dust transported simulation test methods, belong to coal-bed gas exploitation field, this method fills test specimen by using core holding unit (5), pass through air compressor machine (6), solenoid valve (7) and liquid booster pump (8) increase the confining pressure simulation coal seam confining pressure environment of core holding unit (5), it is pressurizeed by constant-flux pump (13) to piston stirring container (1) and water coal mixtures (suspended things) is injected into core holding unit (5), and outflow fluid is collected in case detecting its ingredient, pressure is detected by pressure sensor, pass through electromagnetic flowmeter detection flows, experiment process is detected and accurately controls by electrical control and monitoring system, realize simulation coal-bed gas exploitation during the migration of coal seam fluid and coal dust and the experiment of silting.Pressure control of the present invention, flow control accuracy of measurement are high, and pressure, flowed fluctuation are small, and it is accurate, intuitive that data shows, convenient for controlling, easy to operate.
Description
Technical field
The present invention relates to a kind of test method in experiment indoor simulation coal dust migration, more particularly to a kind of coal bed gas well
Mining output coal dust transported simulation test method, belongs to coal-bed gas exploitation field.
Background technology
With the development of Chinese national economy, the supply of traditional energy gradually decreases, and is discharged in production and living
Great amount of carbon dioxide caused by greenhouse effects serious threat is to entire natural ecological safety, the mankind are to novel, clear
The demand of the clean energy is increasing, thus coal bed gas has received widespread attention as a kind of novel, clean energy resource.China has rich
Rich coal bed gas resource, cbm development is to alleviating China's petroleum resources anxiety present situation, mitigating mine disaster degree, reduction greenhouse
Gas discharge etc. is of great significance.It is larger through counting Southern Qinshui Basin part coal bed gas well coal dust quantum of output, average inspection pump
Period is 6 months, and frequent pump detection and workover has a negative impact, while also increase the mining of coal bed gas to gas well liquid loading dynamic
Cost.The research of coal dust migration rule has become one of core problem of cbm development technology, coal seam reservoirs is protected and raw
The science of production parameter determines to be of great significance.But coal dust source etc. is unclear at present, is produced during coal bed gas well mining
The mechanism study for going out coal dust has not been reported, and seriously hinders the implementation of coal dust prevention and effective mining management and control.
In consideration of it, in experiment indoor simulation coal seam reservoirs confining pressure condition, coal seam fluid and coal during coal-bed gas exploitation are realized
The migration test method of powder has important theory directive significance, for instructing coal bed gas to the migration rule of studying coal powder
Production operation has practical directive significance.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of coal bed gas well mining output coal dust transported simulation test method,
This method can be under the confining pressure environment of coal seam, and the migration of coal seam fluid and coal dust and silting, obtain during simulation coal-bed gas exploitation
The test datas such as the flow of coal dust, flow velocity, pressure drop under to experimental condition, and obtain the migration of final coal seam fluid and coal dust
And clogging test result.The present invention is easy to operate, and easy to implement, obtained data are accurate.
In order to achieve the above object, the present invention is using following technical scheme, a kind of coal bed gas well mining output coal dust migration
Simulation experiment method, used experimental rig include piston stirring container, core holding unit, air compressor machine, solenoid valve, liquid and increase
Press pump, balance, constant-flux pump, counterbalance valve, electromagnetic flowmeter and electrical control and monitoring system, the inlet ductwork of the constant-flux pump
Mouth is placed in container III, and export pipeline connects after being sequentially connected in series counterbalance valve, electromagnetic flowmeter with the epicoele of piston stirring container,
The cavity of resorption of piston stirring container is connected with the axial inlet of core holding unit, on the pipeline between counterbalance valve and electromagnetic flowmeter
Equipped with pressure sensor II；The axial outlet line portals of core holding unit are placed in container II, the axial inlet of core holding unit
Pipeline is equipped with pressure sensor I, and container II is placed on balance；Solenoid valve both ends connect respectively with air compressor machine and liquid booster pump
It connects, the inlet tube crossing of liquid booster pump is placed in container I, outlet and the inlet communication of core holding unit ring pressure, rock core clamping
The outlet crossing of device ring pressure is placed in container I；The electrical control and monitoring system are by electrical equipment and control software group
Into；It is as follows：
(1) ready coal column or cementing, compacting fracturing sand are fitted into the gum cover of core holding unit, by glue after sealing
It is placed in core holding unit, adjusts the length of core holding unit, gum cover and test specimen are fixed；
(2) the water coal mixtures that the concentration being configured is certain, capacity is certain are put into the piston stirring container cleaned up
Cavity of resorption in；
(3) by entire experimental rig connecting pipeline, power supply connect, open power supply and electrical control and monitoring system
System；
(4) clear water is filled in container I and container III；
(5) air compressor machine and liquid booster pump are opened, adds confining pressure to the annular space of core holding unit, confining pressure reaches experimental design value
When stop increase confining pressure；
(6) counterbalance valve is opened, and is set as experiment setting pressure, setting advection pump output pressure is experimental design pressure；
The valve eight of core holding unit inlet and outlet and valve 11 are opened, opens constant-flux pump and piston stirring container connecting pipeline
On valve one and valve two, open the valve three of piston stirring container epicoele inlet and cavity of resorption and core holding unit communicating pipe
The valve four of road pressurizes to piston stirring container epicoele injected media, starts to inject water coal mixtures into core holding unit；
(7) pressure value in control software is observed on pressure sensor I and pressure sensor II or display, and to counterbalance valve
It is adjusted with constant-flux pump, the pressure value of core holding unit inlet is made to reach test pressure；During experiment, pass through electromagnetic current
Flow information is passed to constant-flux pump, and automatically adjust injection flow by constant-flux pump by gauge, makes the pressure of core holding unit inlet
Power remains definite value；
(8) during testing, the numerical value that the gentle electromagnetic flowmeter in pressure sensor I, day is monitored, recorded by control software becomes
Change situation, and core holding unit entrance and the real-time pressure difference of outlet are calculated, draw related data versus time curve, rock
The suspension of heart clamp holder outflow with exporting the container II being connected by receiving；
(9) after the test, it opens the valve ten between core holding unit annular space and container I on connecting line and opens work
The valve 12 for filling in stirring container bottom carries out aerial drainage, releases pipeline connection；Core holding unit is opened, test specimen will be taken out,
Clean test chamber.
Another coal bed gas well mining output coal dust transported simulation test method of the present invention, used experimental rig packet
Include piston stirring container, core holding unit, air compressor machine, solenoid valve, liquid booster pump, balance, constant-flux pump, counterbalance valve, electromagnetic current
Gauge and electrical control and monitoring system, the inlet tube crossing of the constant-flux pump are placed in container III, and export pipeline is gone here and there successively
It is connected after connecing counterbalance valve, electromagnetic flowmeter with the epicoele of piston stirring container, the cavity of resorption and core holding unit of piston stirring container
Axial inlet connection, pressure sensor II is equipped on the pipeline between counterbalance valve and electromagnetic flowmeter；Core holding unit
Axial outlet line portals are placed in container II, and the axial inlet pipeline of core holding unit is equipped with pressure sensor I, and container II is put
It puts on balance；Solenoid valve both ends are connect respectively with air compressor machine and liquid booster pump, and the inlet tube crossing of liquid booster pump is placed in
In container I, outlet and the inlet communication of core holding unit ring pressure, the outlet crossing of core holding unit ring pressure is placed in container I；
The electrical control and monitoring system is made of electrical equipment and control software；It is as follows：
(1) ready coal column or cementing, compacting fracturing sand are fitted into the gum cover of core holding unit, by glue after sealing
It is placed in core holding unit, adjusts the length of core holding unit, gum cover and test specimen are fixed；
(2) the water coal mixtures that the concentration being configured is certain, capacity is certain are put into the piston stirring container cleaned up
Cavity of resorption in；
(3) by entire experimental rig connecting pipeline, power supply connect, open power supply and electrical control and monitoring system
System；
(4) clear water is filled in container I and container III；
(5) air compressor machine and liquid booster pump are opened, adds confining pressure to the annular space of core holding unit, confining pressure reaches experimental design value
When stop increase confining pressure；
(6) counterbalance valve is opened, and is set as maximum working pressure, setting advection pump output flow is experimental design flow；
The valve eight of core holding unit inlet and outlet and valve 11 are opened, opens constant-flux pump and piston stirring container connecting pipeline
On valve one and valve two, open the valve three of piston stirring container epicoele inlet and cavity of resorption and core holding unit communicating pipe
The valve four of road pressurizes to piston stirring container epicoele injected media, starts to inject water coal mixtures into core holding unit；
(7) flow value in control software is observed on electromagnetic flowmeter or display, and constant-flux pump is suitably adjusted, is made
The flow value of core holding unit inlet reaches experiment setting flow；The flow of fluid is flowed out by the container II that is weighed according to balance
The weight of middle fluid converts to obtain；During experiment, pressure information is passed to, and by putting down by constant-flux pump by pressure sensor I
Stream pump automatic adjustment injection pressure, makes the flow of core holding unit inlet remain definite value；
(8) it during testing, monitored by control software, record constant-flux pump, pressure sensor I, the gentle electromagnetic flowmeter in day
Numerical value change situation, and calculate core holding unit entrance and the real-time pressure difference of outlet, draw related data change at any time
Change curve, the suspension of core holding unit outflow with exporting the container II being connected by receiving；
(9) after the test, it opens the valve ten between core holding unit annular space and container I on connecting line and opens work
The valve 12 for filling in stirring container bottom carries out aerial drainage, releases pipeline connection；Core holding unit is opened, test specimen will be taken out,
Clean test chamber.
Further, used experimental rig further includes spare piston stirring container, two piston stirring containers
Epicoele and the pipeline parallel communication with constant-flux pump outlet, cavity of resorption and the pipeline connected with core holding unit axial inlet are in parallel
Connection；During experiment, the valve five and cavity of resorption of first closing spare piston stirring container epicoele inlet are connected with core holding unit
Valve six on pipeline, when the water coal mixtures in piston stirring container, which are used up, also needs to continue experiment, closure piston stirring
The valve three and cavity of resorption of container epicoele inlet and the valve four on core holding unit connecting pipeline open spare piston stirring
The valve five and cavity of resorption of container epicoele inlet and the valve six on core holding unit connecting pipeline, continue to note to core holding unit
Enter fluid；After the test, the valve 13 for opening spare piston stirring container bottom carries out aerial drainage.
Further, in the core holding unit sample room described in above two test method test pressure for 0.1MPa~
16MPa, test temperature are room temperature；Test pressure in the core holding unit annular space is 0.1MPa-20MPa.
Further, in the water coal mixtures described in above two test method, the grain size of coal dust is no more than 2mm, matter
It measures concentration and is not more than 10%.
Further, the precision of the pressure sensor I4 described in above two test method and counterbalance valve 14 is 0.4 grade,
The precision of the electromagnetic flowmeter 16 is 0.2 grade.
The present invention fills test specimen by using core holding unit, by air compressor machine, solenoid valve and liquid booster pump to rock core
Injected media increases the confining pressure simulation coal seam high pressure of core holding unit, the environment sealed in the annular space of clamper, passes through constant-flux pump
It pressurizes to piston stirring container epicoele injected media and water coal mixtures (suspended things) is injected into core holding unit, and collect outflow
Fluid, in case the ingredient of detection outflow fluid, is directly recorded or converted by pressure sensor and electromagnetic flowmeter and balance
Test data is detected by electrical control and monitoring system and accurately controls experiment process, realizes simulation coal-bed gas exploitation
The migration of coal seam fluid and coal dust and the experiment of silting in the process have obtained the flow of coal dust, flow velocity, pressure drop under experimental condition
Etc. test datas, and obtained final coal seam fluid and the migration of coal dust and clogging test result.Pressure control of the present invention, flow control amount
Precision is high, and pressure, flowed fluctuation are small, and it is accurate, intuitive that data shows, convenient for controlling, easy to operate.
Description of the drawings
Fig. 1 is the structure diagram of equipment therefor of the present invention.
In figure：1st, piston stirring container, 2, blender, 3-1, valve one, 3-2, valve two, 3-3, valve three, 3-4, valve
Men Si, 3-5, valve five, 3-6, valve six, 3-7, valve seven, 3-8, valve eight, 3-9, valve nine, 3-10, valve ten, 3-11,
Valve 11,3-12, valve 12,3-13, valve 13,4, pressure sensor I, 5, core holding unit, 6, air compressor machine, 7, electricity
Magnet valve, 8, liquid increase pump, 9, container I, 10, container II, 11, balance, 12, container III, 13, constant-flux pump, 14, counterbalance valve,
15th, pressure sensor II, 16, electromagnetic flowmeter.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, simulation test device used in the present invention, including piston stirring container 1, pressure sensor I4,
Core holding unit 5, air compressor machine 6, solenoid valve 7, liquid booster pump 8, balance 11, constant-flux pump 13, counterbalance valve 14, electromagnetic flowmeter
16th, several containers, several valves 33 and electrical control and monitoring system, the inlet tube crossing of the constant-flux pump 13 are put
In in container III12, export pipeline is sequentially connected in series the epicoele company with piston stirring container 1 after counterbalance valve 14, electromagnetic flowmeter 16
Logical, the cavity of resorption of piston stirring container 1 is connected with the axial entrance of core holding unit 5；The axial outlet line portals of core holding unit 5
It is placed in container II10, the axial inlet pipeline of core holding unit 5 is equipped with pressure sensor I4, and container II10 is placed on balance
On 11, balance 11 is high-precision electronic balance；7 both ends of solenoid valve are connect respectively with air compressor machine 6 and liquid booster pump 8, liquid
The inlet tube crossing of booster pump 8 is placed in container I9, outlet and the inlet communication of 5 ring pressure of core holding unit, 5 ring of core holding unit
The outlet crossing of pressure is placed in container I9；The electrical control and monitoring system by industrial personal computer, display and pick-up instrument,
The electrical equipments such as high-speed camera, power distribution circuit and control software composition.
A diameter of 50mm of the core holding unit 5, length is adjustable for 50~200mm, and outside uses 316L steel makings,
Inner sample room is manufactured using gum cover, and gum cover both ends are sealed respectively by the steel cushion block identical with its internal diameter, are finally distinguished with O-ring
It is sleeved on the gum cover outside two cushion blocks, the space between 5 outer wall of gum cover and core holding unit is annular space, by internally injecting Jie
Matter, which is realized, increases confining pressure, and core holding unit is fixed on the stent using 316L steel makings；The sample of core holding unit 5 is indoor
Maximum working pressure is 16MPa；The injection range of flow of the constant-flux pump 13 is 0-30ml/min, can simulate true stratum
The flow velocity of middle coal seam water, maximum working pressure 16MPa；The capacity of the piston stirring container 1 be 5L, maximum working pressure
For 16MPa；The air compressor machine 6 and the maximum pressure 20MPa of liquid booster pump 8；The pressure sensor I4 and counterbalance valve
14 precision is 0.4 grade, and the precision of the electromagnetic flowmeter 16 is 0.2 grade, can ensure to measure the accuracy of test data,
Guarantee test result is reliable；For a diameter of 50mm of the coal column of experiment, length is adjustable for 50~200mm.
The major function of electrical control and monitoring system is：1. to the distribution of electrical equipment, the safety of entire experimental rig
Protection and alarm etc.；2. pressure, flow to entire simulation test device etc. are acquired, store, handle and show, have simultaneously
Standby integrated console remote control with controlling both of which manually on the spot；3. video prison is carried out to state other than core holding unit 5
Control, with safeguards system safety.Entire experiment process can be set as being automatically performed by man-machine interface or manual intervention is completed, experiment
Data can save as specified data format, and realize report generation, printing.
One 3-1 of valve is equipped on the export pipeline of constant-flux pump 13, valve is equipped on the export pipeline of electromagnetic flowmeter
Two 3-2 are equipped with three 3-3 of valve in 1 epicoele inlet ductwork of piston stirring container, are passed in 1 cavity of resorption of piston stirring container and pressure
Connecting line is equipped with four 3-4 of valve between sensor I4, is respectively equipped in the inlet ductwork of core holding unit 5 and export pipeline
11 3-11 of eight 3-8 of valve and valve is equipped with valve nine on the connecting line of 5 ring pressure of liquid booster pump 8 and core holding unit
3-9 is equipped with ten 3-10 of valve on the export pipeline of 5 ring pressure of core holding unit；All valves are used in Control experiment device
Whether fluid circulates.
The piston stirring container 1 include container cartridge, piston and blender 2, piston is placed in container cartridge, axis with
The axis of container cartridge overlaps, and blender 2 is connect with the cavity of resorption bottom of container cartridge, before on-test, the test water that will be configured
Coal mixtures (suspension) are fitted into the cavity of resorption of piston stirring container 1, during experiment, can pass through the motor of turn on agitator 2
The bottom that coal dust is prevented to be deposited on piston stirring container is stirred, influences the precision of experiment.
Experimental rig further includes another spare piston stirring container 1, the epicoele of two piston stirring containers 1 and with it is flat
The pipeline parallel communication of stream 13 outlets of pump, cavity of resorption and the pipeline parallel communication connected with 5 axial inlet of core holding unit；It is standby
The epicoele inlet ductwork of piston stirring container 1 is equipped with five 3-5 of valve, connecting tube between cavity of resorption and pressure sensor I4
Road is equipped with six 3-6 of valve；During experiment, if the water coal mixtures for experiment in a piston stirring container 1 are (outstanding
Turbid) it is finished, it can continue to test with another spare piston stirring container 1, guarantee test smoothly completes, and avoids testing
Interrupt and influence the precision of result of the test data.
Pressure sensor II15 is equipped on pipeline between counterbalance valve 14 and electromagnetic flowmeter 16, for measuring in pipeline
Pressure.
Even open to atmosphere pipeline is respectively equipped in the bottom of two piston stirring containers 1, valve is respectively equipped on pipeline
13 3-13 of 12 3-12 and valve, when after the test, if the water coal mixtures (suspension) in piston stirring container 1 do not have
It is finished, you can by opening 12 3-12 of valve and 13 3-13 of valve progress aerial drainages herein.
It connects between the export pipeline of constant-flux pump 13 and the inlet ductwork of core holding unit 5, and is set on connecting pipeline
There is seven 3-7 of valve, when needing to do seepage tests, need not move through piston stirring container 1, the pipe being directly over where seven 3-7 of valve
Road is directly to 5 water filling of core holding unit.
One 3-1 of valve~valve, 13 3-13 is check valve, only allows liquid one-way flowing, prevents because of liquid
Flow back and cause the inaccuracy of result of the test.
Water coal mixtures (suspension) used in this test method are suspended in the stream formed in coal seam water for coal dust little particle
Body mixture.With the present apparatus carry out coal dust migration experiment when, need accurately real time measure flow into core holding unit 5 along pipeline
The flow of water coal mixtures (suspension) in interior sample room, but there is no at present can accurate measurement water coal mixtures it is (outstanding
Turbid) flow high precision flow because flowmeter with high accuracy is not allowed through suspension, suspension can be blocked up seriously
Plug, damage flowmeter.In order to solve this problem, accurate metering, the water coal mixtures of control injection core holding unit are (suspended
Liquid) flow, this experiment employ clear water push water coal mixtures (suspension) method.The principle applied is：The pressure of water
Contracting is very small, can ignore, then in the case where 1 upper and lower cavity pipeline diameter of piston stirring container is identical, constant-flux pump 13 will be clear
The flow of 1 epicoele of water injection piston stirring container is identical with the flow that 1 cavity of resorption suspension of piston stirring container flows out, so only needing
It accurately to control, the flow of 1 epicoele clear water of metering piston stirring container injection, you can accurately obtain 1 cavity of resorption of piston stirring container
The flow of flow and suspension the injection core holding unit 5 of suspended outflow.
In order to improve the adaptability of experimental rig, this experimental rig can be mixed by the water coal that coal dust maximum particle diameter is 3mm
Close object (suspension)；Allow the water coal mixtures (suspension) by the biggest quality a concentration of 20% or so, in addition, coal particle size
It is bigger, equipment allow by quality of pc concentration it is smaller, the mass concentration value no more than 10% be coal particle size be 2mm when
Maximum allowable mass concentration.So this experimental provision can simulate all grain size coal dusts in practical coal bed gas well output coal seam water
Migration.
Minimum Area area used in the present invention is 4500mm × 6500mm；To ensure the safety of experiment, divide in order to control
Area, trial zone, control zone are isolated with trial zone, it is ensured that personnel's operation, can be by camera in control room in safety zone
Observe monitoring test area.
The coal bed gas well mining output coal dust transported simulation test method of the present invention, step are as follows：
(1) ready coal column or cementing, compacting fracturing sand are fitted into the gum cover of core holding unit 5, gum cover both ends
The steel cushion block identical with its internal diameter is respectively charged into, O-ring is respectively fitted on the gum cover outside two cushion blocks, gum cover is placed in rock core
In clamper 5, the length of core holding unit 5 is adjusted, gum cover and test specimen are fixed；
(2) the water coal mixtures (suspension) that the concentration being configured is certain, capacity is certain are put into the piston cleaned up
In the cavity of resorption of stirring container 1；
(3) connecting pipeline, power supply in entire experimental rig etc. is connected, opens power supply and electrical control and monitoring system
System；
(4) clear water is filled in container I9 and container III12；
(5) air compressor machine 6 and liquid booster pump 8 are opened, opens the valve nine between liquid booster pump 8 and core holding unit 5
3-9, into the annular space of core holding unit 5 water filling add confining pressure, confining pressure stops increasing confining pressure when reaching experimental design value；
(6) counterbalance valve 14 is opened, and is set as experiment setting pressure, 13 output pressure of setting constant-flux pump is experimental design pressure
Power；11 3-11 of eight 3-8 of valve and valve of 5 inlet and outlet of core holding unit is opened, constant-flux pump 13 is opened and piston stirs
Two 3-2 of one 3-1 of valve and valve on 1 connecting pipeline of container is mixed, opens three 3- of valve of 1 epicoele inlet of piston stirring container
3 and cavity of resorption and 5 connecting pipeline of core holding unit on four 3-4 of valve, pressurize, open to 1 epicoele injected media of piston stirring container
Begin to inject water coal mixtures into core holding unit 5；
(7) pressure value in control software is observed on pressure sensor I4 and pressure sensor II15 or display, and to the back of the body
Pressure valve 14 and constant-flux pump 13 are suitably adjusted, and the pressure value of 5 inlet of core holding unit is made to reach test pressure；Rock core clamps
5 exit of device is vented, and is atmospheric pressure, therefore, it is core holding unit 5 that the pressure value that pressure sensor I4 is measured, which subtracts atmospheric pressure,
The pressure differential of entrance and exit；During experiment, when rock core permeability changes, injection pressure is constant, can cause rock core
The variation of 5 inlet flow rate of clamper, at this point, flow information is passed to constant-flux pump 13, and by advection by electromagnetic flowmeter 16
13 automatic adjustment injection flow of pump, makes the pressure of 5 inlet of core holding unit remain definite value, pressure error does not surpass preferably
0.05MPa is crossed, so as to ensure the pressure difference at 5 both ends of core holding unit as definite value, and then guarantee test precision；
(8) it during testing, monitored by control software, record pressure sensor I4, balance 11 and electromagnetic flowmeter 16
Numerical value change situation, and 5 entrance of core holding unit and the real-time pressure difference of outlet are calculated, it draws related data and changes with time
Curve, the suspension that core holding unit 5 flows out with exporting the container II10 being connected by receiving；
(9) after the test, ten 3-10 of valve between 5 annular space of core holding unit and container I9 on connecting line is opened simultaneously
12 3-12 of valve for opening 1 bottom of piston stirring container carries out aerial drainage, releases pipeline connection；Core holding unit 5 is opened, will be taken
Go out test specimen, clean test chamber.
Another coal bed gas well mining output coal dust transported simulation test method of the present invention, step are as follows：
(1) ready coal column or cementing, compacting fracturing sand are fitted into the gum cover of core holding unit 5, gum cover both ends
The steel cushion block identical with its internal diameter is respectively charged into, O-ring is respectively fitted on the gum cover outside two cushion blocks, gum cover is placed in rock core
In clamper 5, the length of core holding unit 5 is adjusted, gum cover and test specimen are fixed；
(2) the water coal mixtures (suspension) that the concentration being configured is certain, capacity is certain are put into the piston cleaned up
In the cavity of resorption of stirring container 1；
(3) connecting pipeline, power supply in entire experimental rig etc. is connected, opens power supply and electrical control and monitoring system
System；
(4) clear water is filled in container I9 and container III12；
(5) air compressor machine 6 and liquid booster pump 8 are opened, opens the valve nine between liquid booster pump 8 and core holding unit 5
3-9, into the annular space of core holding unit 5 water filling add confining pressure, confining pressure stops increasing confining pressure when reaching experimental design value；
(6) counterbalance valve 14 is opened, and is set as maximum working pressure, 13 output flow of setting constant-flux pump is experimental design stream
Amount；11 3-11 of eight 3-8 of valve and valve of 5 inlet and outlet of core holding unit is opened, constant-flux pump 13 is opened and piston stirs
Two 3-2 of one 3-1 of valve and valve on 1 connecting pipeline of container is mixed, opens three 3- of valve of 1 epicoele inlet of piston stirring container
3 and cavity of resorption and 5 connecting pipeline of core holding unit on four 3-4 of valve, pressurize, open to 1 epicoele injected media of piston stirring container
Begin to inject water coal mixtures into core holding unit 5；
(7) flow value in control software is observed on electromagnetic flowmeter 16 or display, and constant-flux pump 13 is suitably adjusted
Section makes the flow value of 5 inlet of core holding unit reach experiment setting flow；5 exit of core holding unit is vented, and is air
Pressure, therefore, the pressure value that pressure sensor I4 is measured subtracts the pressure differential that atmospheric pressure is 5 entrance and exit of core holding unit,
The flow that fluid is flowed out from core holding unit 5 is converted to obtain by the weight of fluid in the container II10 that is weighed according to balance 11；
During experiment, when rock core permeability changes, if flow is constant, the variation of 5 inlet pressure of core holding unit can be caused,
At this point, pressure information is passed to constant-flux pump 13 by pressure sensor I4, and injection pressure is automatically adjusted by constant-flux pump 13, made
The flow of 5 inlet of core holding unit remains definite value, and flow error is preferably no more than 0.01ml/m with guarantee test
Precision；
(8) it during testing, monitored by control software, record constant-flux pump 13, pressure sensor I4, balance 11 and electromagnetic current
The numerical value change situation of gauge 16, and 5 entrance of core holding unit and the real-time pressure difference of outlet are calculated, draw related data at any time
Between change curve, core holding unit 5 flow out suspension by with export be connected container II10 reception；
(9) after the test, it opens the valve 33 between 5 annular space of core holding unit and container I9 on connecting line and beats
12 3-12 of valve for opening 1 bottom of piston stirring container carries out aerial drainage, releases pipeline connection；Core holding unit 5 is opened, will be taken out
Test specimen cleans test chamber.
In above two test method, in the operation for carrying out step (6), first close in spare piston stirring container 1
Five 3-5 of valve and cavity of resorption of chamber inlet and six 3-6 of valve on 5 connecting pipeline of core holding unit, when in piston stirring container 1
Water coal mixtures use up when also needing to continue experiment, three 3-3 of valve and cavity of resorption of 1 epicoele inlet of closure piston stirring container
With four 3-4 of valve on 5 connecting pipeline of core holding unit, the valve five of spare 1 epicoele inlet of piston stirring container is opened
3-5 and cavity of resorption and six 3-6 of valve on 5 connecting pipeline of core holding unit, continue to inject fluid to core holding unit 5；It is walked
Suddenly during the operation of (9), 13 3-13 of valve for opening spare 1 bottom of piston stirring container carries out aerial drainage.
In above two test method, test pressure is 0.1MPa~16MPa in 5 sample room of core holding unit,
Test temperature is room temperature, can be realized under not coaxial press strip part, the experiment of simulation coal dust migration；5 ring of core holding unit
Test pressure in sky is 0.1MPa-20MPa, and the confining pressure that can simulate different depth coal seam reservoirs is tested.
By to coal bed gas well monitor it is found that in practical coal bed gas well output coal seam water entrained by coal particle size generally not
More than 1mm, due to fracturing fluid recovery (backflow) when can carry out the coal dust of 1-2mm grain sizes, used by above two test method
Coal particle size is not more than 2mm in water coal mixtures (suspension)；The mass concentration of coal dust in practical coal bed gas well output coal seam water
No more than 10%, therefore, the concentration of water coal mixtures (suspension) is not more than 10% used by above two test method.
In this experiment, fracturing sand mesh number used is 65~14 mesh (i.e. 0.212-1.18mm).
Claims (10)
1. a kind of coal bed gas well mining output coal dust transported simulation test method, it is characterised in that：Used experimental rig packet
It includes piston stirring container (1), core holding unit (5), air compressor machine (6), solenoid valve (7), liquid booster pump (8), balance (11), put down
Stream pump (13), counterbalance valve (14), electromagnetic flowmeter (16) and electrical control and monitoring system, the import of the constant-flux pump (13)
Line portals are placed in container III (12), and export pipeline is sequentially connected in series counterbalance valve (14), electromagnetic flowmeter (16) and is stirred afterwards with piston
The epicoele connection of container (1), the cavity of resorption of piston stirring container (1) is connected with the axial inlet of core holding unit (5), in counterbalance valve
(14) pipeline between electromagnetic flowmeter (16) is equipped with pressure sensor II (15)；The axial outlet of core holding unit (5)
Line portals are placed in container II (10), and the axial inlet pipeline of core holding unit (5) is equipped with pressure sensor I (4), container II
(10) it is placed on balance (11)；Solenoid valve (7) both ends are connect respectively with air compressor machine (6) and liquid booster pump (8), liquid supercharging
The inlet tube crossing of pump (8) is placed in container I (9), outlet and the inlet communication of core holding unit (5) ring pressure, core holding unit
(5) the outlet crossing of ring pressure is placed in container I (9)；The electrical control and monitoring system is soft by electrical equipment and control
Part forms；It is as follows：
(1) ready coal column or cementing, compacting fracturing sand are fitted into the gum cover of core holding unit (5), by glue after sealing
It is placed in core holding unit (5), adjusts the length of core holding unit (5), gum cover and test specimen are fixed；
(2) the water coal mixtures that the concentration being configured is certain, capacity is certain are put into the piston stirring container (1) that cleans up
In cavity of resorption；
(3) by entire experimental rig connecting pipeline, power supply connect, open power supply and electrical control and monitoring system；
(4) clear water is filled in container I (9) and container III (12)；
(5) air compressor machine (6) and liquid booster pump (8) are opened, adds confining pressure to the annular space of core holding unit (5), confining pressure reaches experiment
Stop increasing confining pressure during design value；
(6) counterbalance valve (14) is opened, and is set as experiment setting pressure, setting constant-flux pump (13) output pressure is experimental design pressure
Power；The valve eight (3-8) of core holding unit (5) inlet and outlet and valve 11 (3-11) are opened, opens constant-flux pump (13)
With the valve one (3-1) and valve two (3-2) on piston stirring container (1) connecting pipeline, piston stirring container (1) epicoele is opened
The valve three (3-3) and cavity of resorption of inlet and the valve four (3-4) on core holding unit (5) connecting pipeline, stir to piston and hold
Device (1) epicoele injected media pressurizes, and starts the injection water coal mixtures into core holding unit (5)；
(7) pressure value in control software on observation pressure sensor I (4) and pressure sensor II (15) or display, and to carrying on the back
Pressure valve (14) and constant-flux pump (13) are adjusted, and the pressure value of core holding unit (5) inlet is made to reach test pressure；It tested
Flow information is passed to constant-flux pump (13), and automatically adjusted and injected by constant-flux pump (13) by Cheng Zhong by electromagnetic flowmeter (16)
Flow makes the pressure of core holding unit (5) inlet remain definite value；
(8) it during testing, monitored by control software, record pressure sensor I (4), balance (11) and electromagnetic flowmeter (16)
Numerical value change situation, and calculate core holding unit (5) entrance and the real-time pressure difference of outlet, draw related data at any time
Change curve, the suspension of core holding unit (5) outflow with exporting the container II (10) being connected by receiving；
(9) after the test, the valve ten (3-10) between core holding unit (5) annular space and container I (9) on connecting line is opened
And the valve 12 (3-12) for opening piston stirring container (1) bottom carries out aerial drainage, releases pipeline connection；Open core holding unit
(5), test specimen will be taken out, cleans test chamber.
2. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 1, it is characterized in that：Institute
The experimental rig used further includes spare piston stirring container (1), the epicoele and and constant-flux pump of two piston stirring containers (1)
(13) the pipeline parallel communication of outlet, cavity of resorption and the pipeline parallel communication connected with core holding unit (5) axial inlet；Examination
When testing, the valve five (3-5) of spare piston stirring container (1) epicoele inlet and cavity of resorption and core holding unit (5) are first closed
Valve six (3-6) on connecting pipeline, when the water coal mixtures in piston stirring container (1), which are used up, also needs to continue experiment,
The valve three (3-3) and cavity of resorption of closure piston stirring container (1) epicoele inlet and the valve on core holding unit (5) connecting pipeline
Four (3-4) of door, open the valve five (3-5) of spare piston stirring container (1) epicoele inlet and cavity of resorption and core holding unit
(5) valve six (3-6) on connecting pipeline continues to inject fluid to core holding unit (5)；After the test, it opens spare
The valve 13 (3-13) of piston stirring container (1) bottom carries out aerial drainage.
3. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 1 or 2, feature
It is：Test pressure is 0.1MPa~16MPa in described core holding unit (5) sample room, and test temperature is room temperature；The rock
Test pressure in heart clamp holder (5) annular space is 0.1MPa-20MPa.
4. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 3, it is characterized in that：Institute
In the water coal mixtures stated, for the grain size of coal dust no more than 2mm, mass concentration is not more than 10%.
5. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 4, it is characterized in that：Institute
The pressure sensor I (4) and the precision of counterbalance valve (14) stated is 0.4 grade, and the precision of the electromagnetic flowmeter (16) is 0.2
Grade；When the pressure of core holding unit (5) inlet remains definite value, pressure error is no more than 0.05MPa.
6. a kind of coal bed gas well mining output coal dust transported simulation test method, it is characterised in that：Used experimental rig packet
It includes piston stirring container (1), core holding unit (5), air compressor machine (6), solenoid valve (7), liquid booster pump (8), balance (11), put down
Stream pump (13), counterbalance valve (14), electromagnetic flowmeter (16) and electrical control and monitoring system, the import of the constant-flux pump (13)
Line portals are placed in container III (12), and export pipeline is sequentially connected in series counterbalance valve (14), electromagnetic flowmeter (16) and is stirred afterwards with piston
The epicoele connection of container (1), the cavity of resorption of piston stirring container (1) is connected with the axial inlet of core holding unit (5), in counterbalance valve
(14) pipeline between electromagnetic flowmeter (16) is equipped with pressure sensor II (15)；The axial outlet of core holding unit (5)
Line portals are placed in container II (10), and the axial inlet pipeline of core holding unit (5) is equipped with pressure sensor I (4), container II
(10) it is placed on balance (11)；Solenoid valve (7) both ends are connect respectively with air compressor machine (6) and liquid booster pump (8), liquid supercharging
The inlet tube crossing of pump (8) is placed in container I (9), outlet and the inlet communication of core holding unit (5) ring pressure, core holding unit
(5) the outlet crossing of ring pressure is placed in container I (9)；The electrical control and monitoring system is soft by electrical equipment and control
Part forms；It is as follows：
(1) ready coal column or cementing, compacting fracturing sand are fitted into the gum cover of core holding unit (5), by glue after sealing
It is placed in core holding unit (5), adjusts the length of core holding unit (5), gum cover and test specimen are fixed；
(2) the water coal mixtures that the concentration being configured is certain, capacity is certain are put into the piston stirring container (1) that cleans up
In cavity of resorption；
(3) by entire experimental rig connecting pipeline, power supply connect, open power supply and electrical control and monitoring system；
(4) clear water is filled in container I (9) and container III (12)；
(5) air compressor machine (6) and liquid booster pump (8) are opened, adds confining pressure to the annular space of core holding unit (5), confining pressure reaches experiment
Stop increasing confining pressure during design value；
(6) counterbalance valve (14) is opened, and is set as maximum working pressure, setting constant-flux pump (13) output flow is experimental design stream
Amount；The valve eight (3-8) of core holding unit (5) inlet and outlet and valve 11 (3-11) are opened, opens constant-flux pump (13)
With the valve one (3-1) and valve two (3-2) on piston stirring container (1) connecting pipeline, piston stirring container (1) epicoele is opened
The valve three (3-3) and cavity of resorption of inlet and the valve four (3-4) on core holding unit (5) connecting pipeline, stir to piston and hold
Device (1) epicoele injected media pressurizes, and starts the injection water coal mixtures into core holding unit (5)；
(7) flow value in control software on observation electromagnetic flowmeter (16) or display, and constant-flux pump (13) is suitably adjusted
Section makes the flow value of core holding unit (5) inlet reach experiment setting flow；The flow of fluid is flowed out by according to balance (11)
The weight of fluid converts to obtain in the container II (10) of weighing；During experiment, by pressure sensor I (4) by pressure information
Constant-flux pump (13) is passed to, and injection pressure is automatically adjusted by constant-flux pump (13), the flow of core holding unit (5) inlet is made to begin
Definite value is remained eventually；
(8) it during testing, monitored by control software, record constant-flux pump (13), pressure sensor I (4), balance (11) and electromagnetism
The numerical value change situation of flowmeter (16), and core holding unit (5) entrance and the real-time pressure difference of outlet are calculated, draw dependency number
According to versus time curve, the suspension of core holding unit (5) outflow with exporting the container II (10) being connected by receiving；
(9) after the test, the valve ten (3-10) between core holding unit (5) annular space and container I (9) on connecting line is opened
And the valve 12 (3-12) for opening piston stirring container (1) bottom carries out aerial drainage, releases pipeline connection；Open core holding unit
(5), test specimen will be taken out, cleans test chamber.
7. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 6, it is characterized in that：Institute
The experimental rig used further includes spare piston stirring container (1), the epicoele and and constant-flux pump of two piston stirring containers (1)
(13) the pipeline parallel communication of outlet, cavity of resorption and the pipeline parallel communication connected with core holding unit (5) axial inlet；Examination
When testing, the valve five (3-5) of spare piston stirring container (1) epicoele inlet and cavity of resorption and core holding unit (5) are first closed
Valve six (3-6) on connecting pipeline, when the water coal mixtures in piston stirring container (1), which are used up, also needs to continue experiment,
The valve three (3-3) and cavity of resorption of closure piston stirring container (1) epicoele inlet and the valve on core holding unit (5) connecting pipeline
Four (3-4) of door, open the valve five (3-5) of spare piston stirring container (1) epicoele inlet and cavity of resorption and core holding unit
(5) valve six (3-6) on connecting pipeline continues to inject fluid to core holding unit (5)；After the test, it opens spare
The valve 13 (3-13) of piston stirring container (1) bottom carries out aerial drainage.
8. a kind of coal bed gas well mining output coal dust transported simulation test method described according to claim 6 or 7, feature
It is：Test pressure is 0.1MPa~16MPa in described core holding unit (5) sample room, and test temperature is room temperature；The rock
Test pressure in heart clamp holder (5) annular space is 0.1MPa-20MPa.
9. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 8, it is characterized in that：Institute
In the water coal mixtures stated, for the grain size of coal dust no more than 2mm, mass concentration is not more than 10%.
10. a kind of coal bed gas well mining output coal dust transported simulation test method according to claim 9, it is characterized in that：
The pressure sensor I (4) and the precision of counterbalance valve (14) are 0.4 grade, and the precision of the electromagnetic flowmeter (16) is 0.2
Grade；When the flow of core holding unit (5) inlet remains definite value, flow error is no more than 0.01ml/m.
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| CN105507894B (en) * | 2015-12-09 | 2018-07-06 | 河南理工大学 | Coal bed gas vertical well hydraulic fracturing process coal dust output test device and method |
| CN106014398B (en) * | 2016-05-13 | 2019-08-06 | 中国矿业大学(北京) | Coal dust generates and transported simulation experimental method in cbm development |
| CN108316916B (en) * | 2018-01-15 | 2021-03-26 | 河南理工大学 | Discharge and production pressure drop control simulation test method under different coal reservoir conditions |
| CN110186812A (en) * | 2019-05-09 | 2019-08-30 | 西南石油大学 | The dynamic characteristic test macro and test method of pulverized coal group under a kind of reservoir conditions |
| CN115901386B (en) * | 2022-11-21 | 2023-07-04 | 中国石油大学(华东) | Method for researching and judging particle transportation-blocking process in gas-containing coal seam fracture |
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