CN105735966B - Coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device and analogy method - Google Patents
Coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device and analogy method Download PDFInfo
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- CN105735966B CN105735966B CN201610214261.2A CN201610214261A CN105735966B CN 105735966 B CN105735966 B CN 105735966B CN 201610214261 A CN201610214261 A CN 201610214261A CN 105735966 B CN105735966 B CN 105735966B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation devices, including pit shaft simulator, movable support, the both ends of pit shaft simulator to be respectively equipped with top connection and lower contact；Lower contact is connect with the second check valve, liquid-filling valve, liquid injection flowmeter, water pump successively；Top connection is connect with tapping valve, gas-liquid separator, fluid flowmeter, eduction valve successively；Lower contact is connect with the first check valve, total gas injection valve, large-capacity valve, vortex-shedding meter, pressure gauge, pressure regulator valve, gas storage pot valve, air accumulator, air compressor successively；Pressure gauge is equipped with spinner flowmeter, small flow valve successively by parallel pipeline and total secondary connection of gas injection valve, parallel pipeline；Movable support includes rack body, brake castor, steel wire rope, fixed pulley.The present invention also provides a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation methods.The present invention can be with the migration of analog study coal dust solid microparticulate in the wellbore, settlement law.
Description
Technical field
The present invention relates to a kind of simulators, and in particular to a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation
Device and analogy method.
Background technology
Coal bed gas is the grand strategy supplement of conventional gas, alleviates emission reduction to country as a kind of clean environment firendly energy
Pressure, Optimization of Energy Structure realize that economic transition has important strategic importance.Its main acquisition modes is mining with surface drill well,
Pump drainage is carried out using artificial wellbore to the underground water in coal seam and its country rock to promote to inhale in coal seam to reduce coal seam reservoirs pressure
Attached methane desorbing gas release, and be collected via oil jacket annular carrying to well head.The presence of coal dust solid microparticulate is coal
One big feature of layer gas well mining production, in mining production process, coal dust is in wellbore bottom, easily far from Pump Suction Nozzle one end
Assemble agglomerating, and then form deposit buildup or coal bridge, cause wellbore block it is unsmooth, holddown, bury the problems such as pump.Therefore understand at any time
The flow behavior and flow pattern for grasping coal bed gas well downhole well fluid specify migration and the aggregate and precipitate rule of coal dust, are mining side
The selection of formula stops well operations risk assessment etc. with mining and provides advantageous guidance and basis for estimation, to formulate rational mining system
Degree avoids blindness extraction, realizes that production capacity maximization is of great significance.
In recent years, with the development of coal bed gas industry, there is some simulated experiments dress for the mining of coal bed gas well
It sets, such as the coal dust output experimental provision in vertical bore, the visual experimental apparatus of simulation wellbore hole annulus multi phase flow, water pumping gas production
Experimental provision etc..But the function of these analogue experiment installations is more single, not will visualization, high pressure resistant and to temperature,
Pressure, hole deviation, tolerance, the comprehensive regulation of liquid measure and device realize unified combination, nothing to the adaptability of coal dust solid microparticulate
The flow behavior of coal dust solid microparticulate in method accurate simulation coal bed gas well pit shaft, and then the true migration and aggregation for reflecting coal dust
Precipitation.
Invention content
The purpose of the present invention is to provide a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device and simulations
Method, the device and method can be with the migration of analog study coal dust solid microparticulate in the wellbore, settlement laws.
The technical solution adopted in the present invention is：
A kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device, including pit shaft simulator and shaft drum form
The movable support of quasi- device connection, the upper end of the pit shaft simulator are equipped with top connection, and the lower end of pit shaft simulator is equipped with
Lower contact；
The lower contact is connect with the second check valve, liquid-filling valve, liquid injection flowmeter, water pump successively, the liquid phase of water pump
Upstream end is connected to water tank, and the liquid in water tank is pumped into pit shaft simulator by water pump；
The top connection is connect with tapping valve, gas-liquid separator, fluid flowmeter, eduction valve successively, and eduction valve is by pit shaft
Water discharge in simulator；The top connection is connect by vent valve with gas-liquid separator, and pressure release is connected on gas-liquid separator
Valve；
The lower contact successively with the first check valve, total gas injection valve, large-capacity valve, vortex-shedding meter, pressure gauge, pressure regulation
Valve, gas storage pot valve, air accumulator, air compressor connection, the pressure gauge by parallel pipeline and total secondary connection of gas injection valve, and
Union road is equipped with spinner flowmeter, small flow valve successively；
The pit shaft simulator includes transparent pressure-resistant glass tube, and multi-section type center is equipped in the transparent pressure-resistant glass tube
Pipe, the multi-section type central tube are connected through a screw thread by several section short tubes and are formed；Multi-section type central tube by top connection with it is transparent
Pressure-resistant glass tube connection is fixed on the center of transparent pressure-resistant glass tube by centralizer；
The movable support includes rack body, and the lower end of the rack body is equipped with brake castor, the rack body
Upper end and one end of steel wire rope connect, the other end of steel wire rope passes through fixed pulley；
Temperature sensor, pressure sensor, constant temperature heating device are respectively equipped in the top connection and lower contact, temperature passes
Sensor, pressure sensor, constant temperature heating device, air compressor, vortex-shedding meter, water pump and control terminal connect, and control is eventually
End can control water pump, air compressor, constant temperature heating device, and the temperature sensor for acquiring top connection and lower contact is passed with pressure
Sensor data and the fluid flow data of vortex-shedding meter metering.
Further scheme is that the connecting interface of vent valve and gas-liquid separator is located at the top of gas-liquid separator；It lets out
Pressure valve and the connecting interface of gas-liquid separator are located at the top of gas-liquid separator；The connecting interface position of tapping valve and gas-liquid separator
In the side middle and lower part of gas-liquid separator；It is equipped with the short tube with internal and external threads in the bottom of gas-liquid separator, short tube stretches into gas-liquid
In separator, and it is higher by gas-liquid separator bottom 4-6cm；The short tube is connect with fluid flowmeter.The structure can guarantee gas-liquid
Separating effect；By pipeline precession gas-liquid separator 4-6cm, the clogging deposits pipe that can prevent gas-liquid separator bottom from accumulating
Road influences flowing and the cycle of liquid phase.
Further scheme is the connecting interface of vent valve and gas-liquid separator, the company of relief valve and gas-liquid separator
Connection interface, tapping valve are used with gas-liquid separator with the connecting interface of gas-liquid separator and are threadedly coupled；Fluid flowmeter and short tube
Using threaded connection.It is easily installed and is dismantled using threaded connection, also allow for cleaning.
Further scheme is, the interface latus rectum of gas-liquid separator and tapping valve is more than connecing for short tube and fluid flowmeter
Mouth latus rectum；The maximum opening of tapping valve is more than the maximum opening of eduction valve.If the internal diameter of tapping valve is small, there are liquid phase streams
Enter to be less than outflow, causes seal failure, be unfavorable for the separation of gas-liquid.
Further scheme is that the outlet end of water pump is connect with flow divider, using the shunting of flow divider, regulates and controls water pump
Liquid-phase outlet end output quantity.
Further scheme is that the lower contact is made of lower contact pipe nipple with seal base, and seal base connects under
Head pipe nipple is connected through a screw thread, and is convenient to clean sediment.
Further scheme is that the placement location of gas-liquid separator is integrally higher than the top of pit shaft simulator, can make
Gas-liquid separator effectively plays gas-liquid separation effect, facilitates experimental implementation and metering liquid phase flow.
Further scheme is that the top connection, lower contact are used with pit shaft simulator and be threadedly coupled.Transparent pressure resistance
Glass tube can bear the pressure not higher than 1.5Mpa, and design simulation pressure is no more than 0.8MPa, and highest bearing temperature is 55 DEG C.
Coal is carried out using above-mentioned coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device the present invention also provides a kind of
The method of layer Wellbore of Gas Wells internal drainage gas production coal dust transported simulation, includes the following steps：
1), according to shape space annular space size characteristic in coal bed gas well pit shaft, coal bed gas well pit shaft internal drainage gas production coal is assembled
Powder transported simulation device；
2), rack body initial level is placed；The steel wire rope for above carrying rack body upper end opens simultaneously rack body lower end
The banking pin of brake castor；It is carried on steel wire rope, coordinates brake castor, pit shaft simulator is adjusted to determining angle, it is then solid
Determine steel wire rope, brake castor is inserted into banking pin, keeps angle of inclination to stablize constant；
3), with reference to scale on the inside of water tank, quantitative clear water is added；Or according to coal bed gas well field working conditions, choose appropriate particle size
Coal dust is added in water tank, mixes the solidliquid mixture of determining volumetric concentration, keep being sufficiently stirred；
4) vent valve, liquid-filling valve, relief valve, tapping valve, are opened, water pump is opened toward pit shaft simulator by control terminal
Interior injection liquid switches off the pump and relief valve after relief valve has liquid phase spilling；
5) gas line flow, atm number, is selected to select vortex-shedding meter and large-capacity valve branch, small tolerance select spinner flowmeter and
Small flow valve branch；Total gas injection valve, large-capacity valve, small flow valve, gas storage pot valve are closed, by the output port pressure tune of pressure regulator valve
It is extremely minimum；Air compressor is opened by control terminal, the gas injection toward air accumulator in, after reaching setup pressure value in air accumulator, sky
Air compressor is automatically stopped active standby；When gas storage pressure inside the tank is less than 1Mpa, air compressor automatically turns on again；
6) small flow valve or large-capacity valve, are opened according to setting simulation gas flow size selection；Open gas storage pot valve
With total gas injection valve, crack relief valve；Regulate and control pressure regulator valve output port pressure, using with the pressure difference in pit shaft simulator come defeated
It supplies gas body, realizes drain, gas injection, supercharging；
7) it, gradually adjusts and increases pressure regulator valve output port pressure, crack relief valve is coordinated to establish pit shaft simulator internal pressure
Power, pressure value in Synchronous pit shaft simulator；Regulate and control pressure release valve opening and pressure regulator valve output port pressure, realizes in pit shaft
Under the premise of pressure is constant in simulator, gas flow increases；Control terminal opens top connection and the built-in constant temperature of lower contact fills
It sets, realizes the simulation of temperature in pit shaft simulator；
8) water pump, is opened by control terminal, opens liquid-filling valve, standard-sized sheet flow divider, crack eduction valve, and slowly turn down point
It flows valve opening and increases aerial drainage valve opening, keep liquid injection flowmeter consistent with the show value of fluid flowmeter, with design liquid phase
Flow velocity is suitable；
9) migration of coal dust and aggregate and precipitate rule in pit shaft simulator, are observed；Change temperature, pressure, liquid measure, gas
One or several parameters in amount, solid phase coal dust microparticle concentration, hole deviation, coal bed gas well borehole size feature, observe coal dust
Migration changes with aggregate and precipitate rule, multiphase flow flow condition.
Further scheme is that the volumetric concentration of the solidliquid mixture in step 3) is no more than 35%, microparticle grain size
No more than 2mm.
The beneficial effects of the present invention are：
Can simulate it is a variety of under the conditions of the flow behavior of coal dust solid microparticulate in arbitrary hole deviation steady tilted section pit shaft, migration and poly-
Collect Precipitation, and can directly observe multiphase flow fluid flow movement rule；
First check valve, total gas injection valve, large-capacity valve, small flow valve, vortex-shedding meter, spinner flowmeter, pressure regulator valve, storage
Gas tank valve, air accumulator, air compressor are used to simulate the gas phase flowing in coal bed gas well pit shaft；
Pressure regulator valve controls output gas phase air pressure together with air accumulator, and pressure gauge is for checking pressure regulation valve outlet pressure；It deflates
Valve, relief valve, pressure regulator valve, air accumulator, air compressor, total gas injection valve, large-capacity valve, small flow valve are used for the gas of regulation device
Mutually flow；
In such a way that vortex-shedding meter, spinner flowmeter separate metered flow, to realize that large range high precision measures；
Movable support upper end is carried or transferred on steel wire rope, coordinates brake castor to adjust, fix coal bed gas well pit shaft angle,
0~90 ° of adjustable angle range realizes the inclination of coal bed gas well pit shaft；
The flowing of gas phase, liquid phase in simulation coal bed gas well pit shaft can be directly observed using transparent pressure-resistant glass tube；
It is connected through a screw thread the multi-section type central tube formed by several section short tubes, length can all lead to external appearance characteristic size
Cross replacement and realized with short tube is rejected, installation, adjust it is easy, it can be achieved that different pipe string structure characteristic simulations in pit shaft；
Top connection connect with multi-section type central tube, transparent pressure-resistant glass tube respectively by screw thread, lower contact by screw thread and
Transparent pressure resistance glass tube connection, is installed very simple and convenient；
This method can simulate the multiphase flow flow condition in the arbitrary hole deviation steady tilted section pit shaft of coal bed gas well, be theoretical research with
The important verification of engineering practice and guidance；
Flowing simulated experiment of the gas and water two-phase in pit shaft simulator not only may be implemented in the present invention, can also realize coal
The Multiphase Flow simulated experiment of powder, gas and water in pit shaft simulator；The adjusting for coordinating temperature, pressure, can also be achieved coal bed gas
The fluid-flow analogy in well shaft internal drainage gas production each stage；
The present invention is easy to operate, feature-rich, it is only necessary to switch, adjust interface, control valve aperture changes fluid flowing and follows
Circulation journey and flow meet different experiments demand；
The present invention is by temperature sensor, pressure sensor, constant temperature heating device, air compressor, vortex-shedding meter, water pump
It is connect with control terminal, not only simplifies operation, also achieve the real-time measurement and acquisition of data.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is the structural schematic diagram of gas-liquid separator；
Fig. 3 is pit shaft simulator and gas-liquid separator spatial position schematic diagram；
Wherein：1, rack body, 2, brake castor, 3, fixed pulley, 4, steel wire rope, 5, vent valve, 6, top connection, 7, transparent
Pressure-resistant glass tube, 8, multi-section type central tube, 9, lower contact, the 10, second check valve, 11, liquid-filling valve, 12, flow divider, 13, water pump,
14, water tank, 15, eduction valve, 16, fluid flowmeter, 17, liquid phase pipeline, the 18, first check valve, 19, total gas injection valve, 20, gas-liquid
Separator, 21, large-capacity valve, 22, small flow valve, 23, vortex-shedding meter, 24, spinner flowmeter, 25, pressure gauge, 26, pressure regulation
Valve, 27, air accumulator, 28, vapor delivery line, 29, air compressor, 30, control terminal, 31, tapping valve, 32, data cable, 33,
Centralizer, 34, gas storage pot valve, 35, liquid inject flowmeter, 36, relief valve.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Referring to Fig. 1, Fig. 2, Fig. 3, a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device, including shaft drum form
Quasi- device, the movable support being connect with pit shaft simulator, the upper end of the pit shaft simulator are equipped with top connection 6, shaft drum form
The lower end of quasi- device is equipped with lower contact 9；In order to facilitate dismounting and installing, top connection 6, lower contact 9 and pit shaft simulator use
It is threadedly coupled；
Pit shaft simulator includes transparent pressure-resistant glass tube 7, and be equipped with several sections in transparent pressure resistance glass tube 7 is connected by screw thread
The multi-section type central tube 8 connect, arbitrary section can be removed or replace；Multi-section type central tube 8 is fixed on transparent by centralizer 33
In pressure-resistant glass tube 7；
Movable support includes rack body 1, and the lower end of rack body 1 is equipped with brake castor 2, the upper end of rack body 1 with
One end of steel wire rope 4 connects, and the other end of steel wire rope 4 passes through fixed pulley 3；Steel wire rope 4 above carries or transfers 1 upper end of rack body,
Coordinate brake castor 2 with adjusting, fixed angle, ranging from 0~90 ° of adjustable angle, the inclination for simulating coal bed gas well pit shaft；
Lower contact 9 injects flowmeter 35, water with the second check valve 10, liquid-filling valve 11, liquid successively by liquid phase pipeline 17
13 connection of pump, 13 liquid-phase outlet end of water pump are connect with flow divider 12, using the shunting of flow divider 12, regulate and control 13 liquid-phase outlet of water pump
Hold output quantity, water pump 13 that the liquid in water tank 14 is pumped into pit shaft simulator；Top connection 6 divides with tapping valve 31, gas-liquid successively
It is connected from device 20, fluid flowmeter 16, eduction valve 15, the liquid of pit shaft simulator is discharged eduction valve 15；Top connection 6 passes through
Vent valve 5 is connect with gas-liquid separator 20, and relief valve 36 is connected on gas-liquid separator 20；Second check valve 10, liquid-filling valve 11, water
Pump 13, flow divider 12, eduction valve 15, gas-liquid separator 20, tapping valve 31, the liquid phase flowing for regulating and controlling whole device, for simulating
Coal bed gas well pit shaft includes the migration of coal dust liquid phase；
Lower contact 9 by vapor delivery line 28 successively with the first check valve 18, total gas injection valve 19, large-capacity valve 21, vortex street stream
Gauge 23, pressure gauge 25, pressure regulator valve 26, gas storage pot valve 34, air accumulator 27, air compressor 29 connect；Pressure gauge 25 is by simultaneously
Union road is connect for 19 2 times with total gas injection valve, and parallel pipeline is equipped with spinner flowmeter 24, small flow valve 22 successively；First check valve
18, total gas injection valve 19, large-capacity valve 21, small flow valve 22, vortex-shedding meter 23, spinner flowmeter 24, pressure regulator valve 26, air accumulator
Valve 34, air accumulator 27, air compressor 29 are used to simulate the gas phase flowing in coal bed gas well pit shaft；Air compressor 29, pressure regulation
Valve 26 controls output gas phase air pressure with air accumulator 27 together, and pressure gauge 25 is for checking 26 outlet pressure of pressure regulator valve；Vent valve 5,
Relief valve 36, pressure regulator valve 26, air accumulator 27, air compressor 29, total gas injection valve 19, large-capacity valve 21, small flow valve 22 combine
Regulation device gas phase flows；To realize large range high precision metering, separately measured using vortex-shedding meter 23, spinner flowmeter 24
Flow mode；
Top connection 6 and lower contact 9 are respectively equipped with temperature sensor, pressure sensor, constant temperature heating device, temperature sensing
Device, pressure sensor, constant temperature heating device, air compressor 29, vortex-shedding meter 23, water pump 13 pass through data cable 32 and control
Terminal 30 processed connects, and control terminal 30 can control water pump 13, air compressor 29, constant temperature heating device, acquires 6 He of top connection
The fluid flow data of temperature sensor and pressure sensor data and vortex-shedding meter 23 metering of lower contact 9.
In the present embodiment, the connecting interface of vent valve 5 and gas-liquid separator 20 is located at the top of gas-liquid separator 20；Pressure release
The connecting interface of valve 36 and gas-liquid separator 20 is located at the top of gas-liquid separator 20；The company of tapping valve 31 and gas-liquid separator 20
Connection interface is located at the side middle and lower part of gas-liquid separator 20；It is equipped with the short tube with internal and external threads in the bottom of gas-liquid separator 20,
Short tube stretches into gas-liquid separator 20, and is higher by 20 bottom 5cm of gas-liquid separator, which connect with fluid flowmeter 16.It puts
Connecting interface, connecting interface, tapping valve 31 and the gas-liquid of relief valve 36 and gas-liquid separator 20 of air valve 5 and gas-liquid separator 20
The connecting interface of separator 20 is used with gas-liquid separator 20 and is threadedly coupled；Fluid flowmeter 16 is used with short tube and is threadedly coupled,
Both it was easily installed and dismantled, and also allowed for cleaning.
In the present invention, in order to reach good sealing effect, realizes gas-liquid separation, gas-liquid separator 20 and drain can be used
The interface internal diameter of valve 31 is more than short tube and the interface internal diameter with fluid flowmeter 16；The maximum opening of tapping valve is more than eduction valve
Maximum opening.
In the present invention, it is made of with seal base lower contact pipe nipple in lower contact 9, seal base passes through with lower contact pipe nipple
It is threadedly coupled.Transparent pressure resistance glass tube 7 can bear the pressure not higher than 1.5Mpa, and design simulation pressure is no more than 0.8MPa, most
High bearing temperature is 55 DEG C.
In the present invention, the placement location of gas-liquid separator is integrally higher than the top of pit shaft simulator, can make gas-liquid separation
Device effectively plays gas-liquid separation effect, facilitates experimental implementation and metering liquid phase flow.
The present invention can simulate it is a variety of under the conditions of in arbitrary hole deviation steady tilted section pit shaft multiphase flow flow condition.
It is a kind of to be carried out in coal bed gas well pit shaft using above-mentioned coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device
The method of water pumping gas production coal dust transported simulation, includes the following steps：
1), according to shape space annular space size characteristic in coal bed gas well pit shaft, coal bed gas well pit shaft internal drainage gas production coal is assembled
Powder transported simulation device；
2), 1 initial level of rack body is placed；The steel wire rope 4 for above carrying 1 upper end of rack body, opens simultaneously rack body 1
The banking pin of lower end brake castor 2；Steel wire rope 4 above carries, and coordinates brake castor 2, pit shaft simulator is adjusted to determining angle,
Then steel wire rope 4 is fixed, brake castor 2 is inserted into banking pin, keeps angle of inclination to stablize constant；
3), with reference to 14 inside scale of water tank, quantitative clear water is added；Or according to coal bed gas well field working conditions, choose suitable grain
Diameter coal dust is added in water tank 14, mixes the solidliquid mixture of determining volumetric concentration, keep being sufficiently stirred；In preferred embodiment
In, the volumetric concentration of solidliquid mixture is no more than 35%, and microparticle grain size is not more than 2mm；
4) vent valve 5, liquid-filling valve 11, relief valve 36, tapping valve 31, are opened, it is past to open water pump 13 by control terminal 30
Liquid is injected in pit shaft simulator, switches off the pump 13 after relief valve 36 has liquid phase spilling；
5), select gas line flow, atm number that vortex-shedding meter 23 and 21 branch of large-capacity valve, small tolerance is selected to select spinner
Meter 24 and 22 branch of small flow valve；Total gas injection valve 19, large-capacity valve 21, small flow valve 22, gas storage pot valve 34 are closed, by pressure regulator valve
26 output port pressure is adjusted to minimum；Air compressor 29, the gas injection in air accumulator 27, gas storage are opened by control terminal 30
After reaching setup pressure value in tank 27, air compressor 29 is automatically stopped active standby；When pressure is less than 1Mpa in air accumulator 27
When, air compressor 29 automatically turns on again；
6) small flow valve or large-capacity valve, are opened according to setting simulation gas flow size selection；Open gas storage pot valve
34 and total gas injection valve 19, crack relief valve 36；Regulate and control 26 output port pressure of pressure regulator valve, using with the pressure in pit shaft simulator
Force difference conveys gas, realizes drain, gas injection, supercharging；
7) it, gradually adjusts and increases 26 output port pressure of pressure regulator valve, crack relief valve 36 is coordinated to establish pit shaft simulator
Interior pressure, pressure value in Synchronous pit shaft simulator；Regulate and control 36 aperture of relief valve and 26 output port pressure of pressure regulator valve, it is real
Under the premise of pressure is constant in present pit shaft simulator, gas flow increases；Control terminal 30 opens top connection 6 and lower contact 9
Built-in thermostat, realize pit shaft simulator in temperature simulation；
8), by control terminal 30 open water pump 13, open liquid-filling valve 11, standard-sized sheet flow divider 12, crack eduction valve 15, and
It slowly turns down 12 aperture of flow divider and increases 15 aperture of eduction valve, make the display of liquid injection flowmeter 35 and fluid flowmeter 16
Value is consistent, suitable with design liquid phase flow rate；
9) migration of coal dust and aggregate and precipitate rule in pit shaft simulator, are observed；Change temperature, pressure, liquid measure, gas
One or several parameters in amount, solid phase coal dust microparticle concentration, hole deviation, coal bed gas well borehole size feature, observe coal dust
Migration changes with aggregate and precipitate rule, multiphase flow flow condition.
This method can realize the mould of gas, liquid, solid, multiphase flow flow condition in the arbitrary hole deviation steady tilted section pit shaft of coal bed gas well
It is quasi-；Change temperature, pressure, tolerance, liquid measure, solid phase coal dust microparticle concentration by adjusting, comes the migration and aggregation of studying coal powder
Precipitation stops well operations risk assessment etc. and provides advantageous guidance and basis for estimation for the selection of production scheme and mining.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device, including pit shaft simulator and pit shaft are simulated
The movable support of device connection, it is characterised in that：The upper end of the pit shaft simulator is equipped with top connection, pit shaft simulator
Lower end is equipped with lower contact；
The lower contact is connect with the second check valve, liquid-filling valve, liquid injection flowmeter, water pump successively, and water pump will be in water tank
Liquid is pumped into pit shaft simulator；
The top connection is connect with tapping valve, gas-liquid separator, fluid flowmeter, eduction valve successively, and eduction valve simulates pit shaft
Water discharge in device；The top connection is connect by vent valve with gas-liquid separator, and relief valve is connected on gas-liquid separator；
The lower contact successively with the first check valve, total gas injection valve, large-capacity valve, vortex-shedding meter, pressure gauge, pressure regulator valve, storage
Gas tank valve, air accumulator, air compressor connection；The pressure gauge passes through parallel pipeline and total secondary connection of gas injection valve, parallel transistor
Road is equipped with spinner flowmeter, small flow valve successively；
The pit shaft simulator includes transparent pressure-resistant glass tube, and multi-section type central tube is equipped in the transparent pressure-resistant glass tube,
The multi-section type central tube is connected through a screw thread by several section short tubes and is formed, and multi-section type central tube passes through top connection and transparent pressure resistance
Glass tube connects, and the center of transparent pressure-resistant glass tube is fixed on by centralizer；
The movable support includes rack body, and the lower end of the rack body is equipped with brake castor, the rack body it is upper
End is connect with one end of steel wire rope, and the other end of steel wire rope passes through fixed pulley；
Temperature sensor, pressure sensor, constant temperature heating device, temperature sensing are respectively equipped in the top connection and lower contact
Device, pressure sensor, constant temperature heating device, air compressor, vortex-shedding meter, water pump and control terminal connect.
2. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 1, it is characterised in that：
The connecting interface of vent valve and gas-liquid separator is located at the top of gas-liquid separator；The connection of relief valve and gas-liquid separator
Interface is located at the top of gas-liquid separator；Under the connecting interface of tapping valve and gas-liquid separator is located in the side of gas-liquid separator
Portion；It is equipped with the short tube with internal and external threads in the bottom of gas-liquid separator, short tube stretches into gas-liquid separator, and is higher by gas-liquid separation
Device bottom 4-6cm；The short tube is connect with fluid flowmeter.
3. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 2, it is characterised in that：
The connecting interface of vent valve and gas-liquid separator, the connecting interface of relief valve and gas-liquid separator, tapping valve and gas-liquid separator
Connecting interface and gas-liquid separator using being threadedly coupled；Fluid flowmeter is used with short tube and is threadedly coupled.
4. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 1, it is characterised in that：
The interface latus rectum of gas-liquid separator and tapping valve is more than the interface latus rectum with fluid flowmeter；The maximum opening of tapping valve, which is more than, to be let out
Flow the maximum opening of valve.
5. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 1, it is characterised in that：
The outlet end of water pump is connect with flow divider.
6. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 1, it is characterised in that：
The top connection, lower contact are used with pit shaft simulator and are threadedly coupled.
7. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 6, it is characterised in that：
The lower contact is made of lower contact pipe nipple with seal base, and seal base is connected through a screw thread with lower contact pipe nipple.
8. according to the coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device described in claim 1, it is characterised in that：
The placement location of gas-liquid separator is integrally higher than the top of pit shaft simulator.
9. a kind of coal bed gas well pit shaft internal drainage gas production coal dust transported simulation device using described in claim 5 carries out coal seam
The method of Wellbore of Gas Wells internal drainage gas production coal dust transported simulation, it is characterised in that include the following steps：
1）, according to shape space annular space size characteristic in coal bed gas well pit shaft, assembling coal bed gas well pit shaft internal drainage gas production coal dust fortune
Move simulator；
2）, rack body initial level place；The steel wire rope for above carrying rack body upper end opens simultaneously the braking of rack body lower end
The banking pin of castor；It is carried on steel wire rope, coordinates brake castor, pit shaft simulator is adjusted to determining angle, then fix steel
Cord, brake castor are inserted into banking pin, keep angle of inclination to stablize constant；
3）, with reference to scale on the inside of water tank, quantitative clear water is added；Or according to coal bed gas well field working conditions, appropriate particle size coal dust is chosen,
It is added in water tank, mixes the solidliquid mixture of determining volumetric concentration, keep being sufficiently stirred；
4）, open vent valve, liquid-filling valve, relief valve, tapping valve, by control terminal open water pump noted in pit shaft simulator
Enter liquid, switches off the pump and relief valve after relief valve has liquid phase spilling；
5）, selection gas line flow, atm number selects vortex-shedding meter and large-capacity valve branch, small tolerance to select spinner flowmeter and small stream
Measure valve branch；Total gas injection valve, large-capacity valve, small flow valve, gas storage pot valve are closed, the output port pressure of pressure regulator valve is adjusted to most
It is low；Air compressor is opened by control terminal, the gas injection in air accumulator, after reaching setup pressure value in air accumulator, air pressure
Contracting machine is automatically stopped active standby；When gas storage pressure inside the tank is less than 1Mpa, air compressor automatically turns on again；
6）, small flow valve or large-capacity valve opened according to setting simulation gas flow size selection；Open gas storage pot valve and total
Gas injection valve, crack relief valve；Regulate and control pressure regulator valve output port pressure, gas is conveyed using with the pressure difference in pit shaft simulator
Body realizes drain, gas injection, supercharging；
7）, gradually adjust increase pressure regulator valve output port pressure, coordinate crack relief valve to establish pressure in pit shaft simulator, together
Pressure value in step observation pit shaft simulator；Regulate and control pressure release valve opening and pressure regulator valve output port pressure, realizes and simulated in pit shaft
Under the premise of pressure is constant in device, gas flow increases；Control terminal opens top connection and the built-in heated at constant temperature of lower contact fills
It sets, realizes the simulation of temperature in pit shaft simulator；
8）, water pump opened by control terminal, open liquid-filling valve, standard-sized sheet flow divider, crack eduction valve, and slowly turn down flow divider
Aperture and increase aerial drainage valve opening, keep liquid injection flowmeter consistent with the show value of fluid flowmeter, with design liquid phase flow rate
Quite；
9）, observation pit shaft simulator in coal dust migration and aggregate and precipitate rule；Change temperature, pressure, liquid measure, tolerance, consolidate
One or several parameters in phase coal dust microparticle concentration, hole deviation, coal bed gas well borehole size feature, observe the migration of coal dust with
Aggregate and precipitate rule, the variation of multiphase flow flow condition.
10. according to the method described in claim 9, it is characterised in that：Step 3）In solidliquid mixture volumetric concentration not
More than 35%, microparticle grain size is not more than 2mm.
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