CN105735965A - Coal-bed gas well shaft drainage gas recovery visual simulation experiment device and simulation method - Google Patents
Coal-bed gas well shaft drainage gas recovery visual simulation experiment device and simulation method Download PDFInfo
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- CN105735965A CN105735965A CN201610213283.7A CN201610213283A CN105735965A CN 105735965 A CN105735965 A CN 105735965A CN 201610213283 A CN201610213283 A CN 201610213283A CN 105735965 A CN105735965 A CN 105735965A
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
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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 coal-bed gas well shaft drainage gas recovery visual simulation experiment device which comprises a shaft simulation device and a moveable bracket, wherein an upper connector and a lower connector with release valves are respectively arranged at two ends of the shaft simulation device; the upper connector is connected with a first one-way valve, a liquid injection valve, a liquid injection flowmeter and a water pump in sequence; the lower connector is connected with a fluid meter and a draining valve in sequence; the lower connector is connected with a second one-way valve, a main gas injection valve, a gas-liquid separator, a large flow valve, a vortex shedding flowmeter, a pressure gauge, a pressure adjusting valve , a gas storage tank valve, a gas storage tank and an air compressor in sequence; the gas-liquid separator is in secondary connection with the pressure gauge through a parallel connected pipeline; a rotor flowmeter and a small flow valve are arranged in sequence on the parallel connected pipeline; the shaft simulation device comprises a transparent pressure-resistant glass tube and a multi-section type central tube. The invention further provides a coal-bed gas well shaft drainage gas recovery visual simulation method. By adopting the coal-bed gas well shaft drainage gas recovery visual simulation experiment device and the coal-bed gas well shaft drainage gas recovery visual simulation method, the flowing state of multi-phase flow inside a coal-bed gas well in any shaft deflection and deflection stabilizing section can be simulated.
Description
Technical field
The present invention relates to a kind of analog, be specifically related to a kind of coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision and analogy method.
Background technology
Coal bed gas, as a kind of clean environment firendly energy, is that the grand strategy of conventional gas is supplemented, and country is alleviated emission reduction, Optimization of Energy Structure, realizes economic transition and have important strategic importance.It mainly obtains mode is mining with surface drill well, utilizes artificial well that the subsoil water in coal seam and country rock thereof is carried out pump drainage, thus reducing coal seam reservoirs pressure, promoting the methane desorbing gas release of absorption in coal seam, and being collected to well head via oil jacket annular carrying.Due to coal seam reservoirs stress sensitive, so in gatherer process, it is necessary to understand the change grasping coal seam reservoirs at any time, in order to adjust mining intensity in time, make the exploitation of coal bed gas realize maximizing.Directly affecting most of coal seam reservoirs change is exactly flow behavior and the flow pattern of coal bed gas well downhole well fluid.Namely the flow condition in pit shaft is accurately determined, for formulating rational mining system, it is to avoid blindly extraction, it is achieved production capacity maximizes significant.
In recent years, with the development of coal bed gas industry, the mining for coal bed gas well had had some analogue experiment installations, 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 comparatively single, not by visualization, high pressure resistant with the adaptability of coal dust solid microparticulate is realized unified combination by temperature, pressure, hole deviation, tolerance, the comprehensive regulation of liquid measure and device, it is impossible to the flow behavior of accurate simulation coal bed gas well downhole well fluid.
Summary of the invention
It is an object of the invention to provide a kind of coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision and analogy method, this experimental provision and method can simulate the multiphase flow flow condition in any hole deviation steady tilted section pit shaft of coal bed gas well.
The technical solution adopted in the present invention is: a kind of coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision, including the travel(l)ing rest that pit shaft analog is connected with pit shaft analog, the upper end of described pit shaft analog is provided with the top connection of vent valve, and the lower end of pit shaft analog is provided with lower contact；Top connection injects effusion meter with the first check valve, liquid-filling valve, liquid successively, water pump is connected, and water pump is by liquid suction pit shaft analog in water tank；Lower contact is connected with flow measuring apparatus, eduction valve successively, pit shaft analog by eduction valve toward water tank discharge opeing；
Described lower contact is connected with the second check valve, total gas injection valve, gas-liquid separator, large-capacity valve, vortex-shedding meter, Pressure gauge, pressure regulator valve, gas storage pot valve, air accumulator, air compressor successively；Described gas-liquid separator pipeline in parallel is connected with Pressure gauge secondary, and parallel pipeline is sequentially provided with spinner flowmeter, low discharge valve, and described gas-liquid separator is connected to blowoff valve；
Described pit shaft analog includes transparent pressure glass tubing, it is provided with multi-section type central canal in described transparent pressure glass tubing, described multi-section type central canal is threaded connection by some joint short tubes and forms, multi-section type central canal is connected with transparent pressure glass tubing by top connection, is fixed on the center of transparent pressure glass tubing by centralizer；The length of multi-section type central canal and external appearance characteristic size all can be passed through to change and reject short tube and realize；
Described travel(l)ing rest includes rack body, and the lower end of described rack body is provided with brake castor, and the upper end of described rack body is connected with one end of steel wire rope, the other end traverse fixed pulley of steel wire rope；
Being respectively equipped with temperature sensor, pressure transducer, constant temperature heating device in described top connection and lower contact, temperature sensor, pressure transducer, air compressor, constant temperature heating device, vortex-shedding meter, water pump are connected with control terminal；Control terminal and can regulate and control water pump and air compressor, gather temperature sensor and the pressure sensor data of top connection and lower contact and the fluid flow data of vortex-shedding meter metering.
Further scheme is, the drain side of described water pump is connected with flow divider, utilizes the shunting of flow divider, the drain side output of regulation and control water pump.
Further scheme is, described top connection, lower contact adopt with pit shaft analog threadeds.
Further scheme is, described lower contact is built-in with bubble cutter sweep.
Further scheme is, described bubble cutter sweep includes plectane, and described plectane is provided with some holes.
Further scheme is, described transparent pressure glass tubing outer wall posts twice with reference to scale, twice with reference to scale minimum scale respectively millimeter with centimetre.
Further scheme is, transparent pressure glass tubing can bear the pressure not higher than 1.5Mpa, and the highest bearing temperature is 55 DEG C.
The present invention also provides for a kind of method adopting above-mentioned coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision to carry out coal bed gas well pit shaft internal drainage gas production visual Simulation, comprises the steps:
1), coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision is assembled；
2), travel(l)ing rest initial level is placed；Lift up rack body upper end steel wire rope, open the banking pin of rack body lower end brake castor simultaneously；Steel wire rope lifts up, and coordinates brake castor, is regulated by pit shaft analog and determines angle to a certain, then fixes steel wire rope, and brake castor inserts banking pin, keeps angle of inclination to stablize constant；
3), with reference to scale inside water tank, quantitative clear water is added；Or according to coal bed gas well field working conditions, choose appropriate particle size coal dust, add in water tank, mix the solidliquid mixture determining volumetric concentration；
4), open vent valve and liquid-filling valve, close eduction valve, flow divider, open water pump toward injection liquid measure in pit shaft analog by controlling terminal, be then turned off water pump；
5), selecting gas line flow process, atm number selects vortex-shedding meter and large-capacity valve branch road, and little tolerance selects spinner flowmeter and low discharge valve branch road；Close total gas injection valve, large-capacity valve, low discharge valve, the output port pressure of pressure regulator valve is adjusted to minimum, close gas storage pot valve；By controlling terminal control air compressor, gas injection in air accumulator, after reaching setup pressure value in air accumulator, air compressor is automatically stopped active standby；When gas storage pressure inside the tank is lower than 1Mpa, air compressor automatically turns on again；
6), select to open low discharge valve or large-capacity valve according to gas flow size；Open gas storage pot valve and total gas injection valve, keep the minimum aperture of vent valve；Regulation and control pressure regulator valve output port pressure, utilizes pressure regulator valve output port and the pressure reduction conveying gas in pit shaft analog；
7), pressure in pit shaft analog, regulation and control vent valve aperture and pressure regulator valve output port pressure are observed, it is achieved under the premise that in pit shaft analog, pressure is constant, gas flow increases；Control terminal and open the built-in thermostat of top connection and lower contact, change analog temperature in pit shaft analog；
8), regulate eduction valve aperture, utilize fluid flowmeter to observe liquid phase stream outflow, open water pump simultaneously, open and regulate eduction valve, make liquid inject effusion meter consistent with the show value of fluid flowmeter；
9), gas, liquid, solid multiphase flow flow condition in pit shaft analog is observed；Change one or several parameter in temperature, pressure, liquid measure, tolerance, hole deviation, coal bed gas well borehole size feature, observe the change of multiphase flow flow condition.
The beneficial effects of the present invention is:
The multiphase flow flow condition in any hole deviation steady tilted section pit shaft under multiple condition can be simulated, and can directly observe the fluid characteristics of motion, be widely used, strong adaptability；
Water pump, liquid-filling valve, liquid inject effusion meter, the first check valve, flow measuring apparatus, eduction valve, water tank formation liquid-phase loop, regulate and control the liquid phase circulation of whole device, for simulating the liquid phase circulation in coal bed gas well pit shaft；
Second check valve, total gas injection valve, gas-liquid separator, large-capacity valve, low discharge valve, vortex-shedding meter, spinner flowmeter, pressure regulator valve, gas storage pot valve, air accumulator, air compressor are for simulating 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 used for checking pressure regulator valve outlet pressure；Vent valve, pressure regulator valve, air accumulator, air compressor, total gas injection valve, large-capacity valve, low discharge valve flow for the gas phase of regulation device；
Vortex-shedding meter, spinner flowmeter is adopted to separate the mode of metered flow, to realize large range high precision metering；
Steel wire rope, fixed pulley, brake castor is utilized to regulate to the angle of inclination realizing pit shaft analog；
Steel wire rope lifts up or transfers travel(l)ing rest upper end, coordinates brake castor to regulate, to fix coal bed gas well pit shaft angle, adjustable angle scope 0～90 °, it is achieved the inclination of coal bed gas well pit shaft；
Transparent pressure glass tubing is adopted can directly to observe the flowing of multiphase flow in simulation coal bed gas well pit shaft；
Being threaded connection by some joint short tubes and form multi-section type central canal, its length and external appearance characteristic size all can be realized with rejecting short tube by replacing, installation, adjustment simplicity；Different pipe strings in the transparent pressure glass tubing short tube concatenation of unlike material (different-diameter) architectural feature simulation can be realized；
Some joint clear central pipes are threaded connection, it is simple to install and replace, may make up space in the pit shaft of different size feature, also allow for the simulation of any well depth position of coal bed gas well；
Top connection is connected with multi-section type central canal, transparent pressure glass tubing respectively by screw thread, and lower contact is connected with transparent pressure glass tubing by screw thread, and multi-section type central canal lower end is unsettled, installs very simple and convenient；
The method can simulate the multiphase flow flow condition in any hole deviation steady tilted section pit shaft of coal bed gas well, is important checking and the guidance of theoretical research and engineering practice；
The present invention is possible not only to realize the biphase flowing simulated experiment in pit shaft analog of gas and water, it is possible to realize the multiphase flow simulation experiment in pit shaft analog of coal dust, gas and water；Coordinate the adjustment of temperature, pressure, also can realize the fluid-flow analogy in coal bed gas well pit shaft internal drainage each stage of gas production；
The present invention is easy and simple to handle, feature richness, it is only necessary to switching, adjustment interface, controls valve opening, changes fluid flow circuit flow process and flow, meet different experiments demand；
Temperature sensor, pressure transducer, constant temperature heating device, air compressor, vortex-shedding meter, water pump are connected by the present invention with control terminal, have both simplified operation, also achieve measuring in real time and gathering of data.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of bubble cutter sweep.
nullWherein: 1、Rack body，2、Brake castor，3、Fixed pulley，4、Steel wire rope，5、Vent valve，6、Top connection，7、Transparent pressure glass tubing，8、Multi-section type central canal，9、Lower contact、10、First 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，18、Second check valve，19、Total gas injection valve，20、Gas-liquid separator，21、Large-capacity valve，22、Low discharge valve，23、Vortex-shedding meter，24、Spinner flowmeter，25、Pressure gauge，26、Pressure regulator valve，27、Air accumulator，28、Vapor delivery line，29、Air compressor，30、Control terminal，31、Blowoff valve，32、Data cable，33、Centralizer，34、Gas storage pot valve，35、Liquid injects effusion meter.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, Fig. 2, a kind of coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision, including the travel(l)ing rest that pit shaft analog is connected with pit shaft analog, the upper end of pit shaft analog is provided with the top connection 6 of vent valve 5, and the lower end of pit shaft analog is provided with lower contact 9；Top connection 6 injects effusion meter 35 with the first check valve 10, liquid-filling valve 11, liquid successively by liquid phase pipeline 17, water pump 13 is connected, and water pump 13 is by liquid suction pit shaft analog in water tank 14；The drain side of water pump 13 is connected with flow divider 12, utilizes the shunting of flow divider 12, the drain side output of regulation and control water pump 13；Lower contact 9 is connected with flow measuring apparatus 16, eduction valve 15 successively, and the liquid of pit shaft analog is returned and flows back in water tank 14 by eduction valve 15；First check valve 10, liquid-filling valve 11, water pump 13, eduction valve 15, water tank 14 form liquid-phase loop, regulate and control the liquid phase circulation of whole device, for simulating the liquid phase flowing in coal bed gas well pit shaft；
Lower contact 9 is connected with the second check valve 18, total gas injection valve 19, gas-liquid separator 20, large-capacity valve 21, vortex-shedding meter 23, Pressure gauge 25, pressure regulator valve 26, gas storage pot valve 34, air accumulator 27, air compressor 29 successively by vapor delivery line 28；Gas-liquid separator 20 pipeline in parallel is connected for 25 2 times with Pressure gauge, and parallel pipeline is sequentially provided with spinner flowmeter 24, low discharge valve 22, and gas-liquid separator 20 is connected to blowoff valve 31；Second check valve 18, total gas injection valve 19, gas-liquid separator 20, large-capacity valve 21, low discharge valve 22, vortex-shedding meter 23, spinner flowmeter 24 pressure regulator valve 26, gas storage pot valve 34, air accumulator 27, air compressor 29 are for simulating the gas phase flowing in coal bed gas well pit shaft；Air compressor 29, pressure regulator valve 26 control output gas phase air pressure together with air accumulator 27, and Pressure gauge 25 is used for checking pressure regulator valve 26 outlet pressure；Vent valve 5, pressure regulator valve 26, air accumulator 27, air compressor 29, total gas injection valve 19, large-capacity valve 21, low discharge valve 22 combinatorial regulation device gas phase circulate；For realizing large range high precision metering, adopt vortex-shedding meter 23, spinner flowmeter 24 separately metered flow mode；
Pit shaft analog includes transparent pressure glass tubing 7, is provided with, in transparent pressure glass tubing 7, the multi-section type central canal 8 that some joints are threaded connection, and arbitrarily joint can disallowable or replacement for it；Multi-section type central canal 8 is fixed on the center of transparent pressure glass tubing 7 by centralizer 33；
Travel(l)ing rest includes rack body 1, and the lower end of rack body 1 is provided with brake castor 2, and the upper end of rack body 1 is connected with one end of steel wire rope 4, the other end traverse fixed pulley 3 of steel wire rope 4；Steel wire rope 4 lifts up or transfers rack body 1 upper end, coordinates brake castor 2 with adjustment, fixed angle, and adjustable angle ranges for 0～90 °, for simulating the inclination of coal bed gas well pit shaft；
Being respectively equipped with temperature sensor, pressure transducer, constant temperature heating device in top connection 6 and lower contact 9, temperature sensor, pressure transducer, constant temperature heating device, air compressor 29, vortex-shedding meter 23, water pump 13 are connected with controlling terminal 30 by data cable 32；Control terminal 30 and can regulate and control water pump 13 and air compressor 29, gather the temperature sensor in top connection 6 and lower contact 9 and pressure sensor data and the fluid flow data of vortex-shedding meter 23 metering.
In order to easy disassembly with install, top connection 6, lower contact 9 and pit shaft analog adopt threadeds.
Being built-in with bubble cutter sweep in lower contact 9, bubble cutter sweep includes plectane, and described plectane is provided with some holes, is distributed on plectane in the hole setting metering hole as required.Post twice with reference to scale at transparent pressure glass tubing 7 outer wall, twice with reference to scale minimum scale respectively millimeter with centimetre.
In the present invention, transparent pressure glass tubing 7 can bear the pressure not higher than 1.5Mpa, and the highest bearing temperature is 55 DEG C.
The present invention can simulate under multiple condition the flow condition of multiphase flow in any hole deviation steady tilted section pit shaft.
The present invention also provides for a kind of method adopting above-mentioned coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision to carry out coal bed gas well pit shaft internal drainage gas production visual Simulation, comprises the steps:
1), according to coal bed gas well borehole size feature, coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision is assembled；
2), travel(l)ing rest initial level is placed；Then lift up rack body 1 upper end steel wire rope 4, open the banking pin of rack body 1 lower end brake castor 2 simultaneously；Steel wire rope 4 lifts up, and coordinates brake castor 2, is regulated by pit shaft analog and determines angle to a certain, fixing steel wire rope 4, and brake castor 2 inserts banking pin, keeps angle of inclination to stablize constant；
3), with reference to scale inside water tank 14, quantitative clear water is added；Or according to coal bed gas well field working conditions, choose appropriate particle size coal dust, add in water tank 14, mix the solidliquid mixture determining volumetric concentration；Clear water can be adopted to be simulated experiment, it is possible to adopt the solidliquid mixture with coal dust to be simulated experiment；
4), open vent valve 5 and liquid-filling valve 11, close eduction valve 15, flow divider 12, open water pump 13 and set liquid measure by controlling terminal 30 toward injecting in pit shaft analog, be then turned off water pump 13；
5), selecting gas line flow process, atm number selects vortex-shedding meter 23 and large-capacity valve 21 branch road, and little tolerance selects spinner flowmeter 24 and low discharge valve 22 branch road；Close total gas injection valve 19, large-capacity valve 21, low discharge valve 22, the output port pressure of pressure regulator valve 26 is adjusted to minimum, close gas storage pot valve 34；Controlling air compressor 29 by controlling terminal 30, gas injection in air accumulator 27, after reaching setup pressure value in air accumulator 27, air compressor 29 is automatically stopped active standby；When in air accumulator 27, pressure is lower than 1Mpa, air compressor 29 automatically turns on again；
6), select to open low discharge valve 22 or large-capacity valve 21 according to gas flow size；Open gas storage pot valve 34 and total gas injection valve 19, keep the minimum aperture of vent valve 5；Regulation and control pressure regulator valve 26 output port pressure, utilizes and carries gas with the pressure differential in pit shaft analog；
7), pressure in pit shaft analog, regulation and control vent valve aperture and pressure regulator valve output port pressure are observed, it is achieved under the premise that in pit shaft analog, pressure is constant, gas flow increases；Control terminal and open the built-in thermostat of top connection and lower contact, change analog temperature in pit shaft analog；
8), regulate eduction valve aperture, utilize fluid flowmeter to observe liquid phase stream outflow, open water pump simultaneously, open and regulate eduction valve, make liquid inject effusion meter consistent with the show value of fluid flowmeter；
9), gas, liquid, solid multiphase flow flow condition in pit shaft analog is observed；Change one or several parameter in temperature, pressure, liquid measure, tolerance, hole deviation, coal bed gas well borehole size feature, observe the change of multiphase flow flow condition.
This method can realize the simulation of gas, liquid, solid multiphase flow flow condition in any hole deviation steady tilted section pit shaft of coal bed gas well；Can be used for the simulation study of oil, natural gas, shale gas extraction process.
It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to claims of the present invention.
Claims (7)
1. a coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision, including pit shaft analog, and the travel(l)ing rest being connected with pit shaft analog, it is characterized in that: the upper end of described pit shaft analog is provided with the top connection of vent valve, and the lower end of pit shaft analog is provided with lower contact；Top connection injects effusion meter with the first check valve, liquid-filling valve, liquid successively, water pump is connected, and water pump is by the liquid suction pit shaft analog in water tank；Lower contact is connected with eduction valve, and this connection pipeline is provided with flow measuring apparatus, pit shaft analog by eduction valve toward water tank discharge opeing；
Described lower contact is connected with the second check valve, total gas injection valve, gas-liquid separator, large-capacity valve, vortex-shedding meter, Pressure gauge, pressure regulator valve, gas storage pot valve, air accumulator, air compressor successively；Gas-liquid separator pipeline in parallel is connected with Pressure gauge secondary, and parallel pipeline is sequentially provided with spinner flowmeter, low discharge valve；Described gas-liquid separator is connected to blowoff valve；
Described pit shaft analog includes transparent pressure glass tubing, is provided with multi-section type central canal in described transparent pressure glass tubing, and described multi-section type central canal is threaded connection by some joint short tubes and forms；Multi-section type central canal is connected with transparent pressure glass tubing by top connection, is fixed on the center of transparent pressure glass tubing by centralizer；
Described travel(l)ing rest includes rack body, and the lower end of described rack body is provided with brake castor, and the upper end of described rack body is connected with one end of steel wire rope, the other end traverse fixed pulley of steel wire rope；
Being respectively equipped with temperature sensor, pressure transducer, constant temperature heating device in described top connection and lower contact, temperature sensor, pressure transducer, air compressor, constant temperature heating device, vortex-shedding meter, water pump are connected with control terminal.
2. coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision according to claim 1, it is characterised in that: it is provided with flow divider in the drain side of water pump.
3. coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision according to claim 1, it is characterised in that: described top connection, lower contact adopt with pit shaft analog threadeds.
4. the coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision according to claim 1 or 3, it is characterised in that: described lower contact is built-in with bubble cutter sweep.
5. coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision according to claim 4, it is characterised in that: described bubble cutter sweep includes plectane, and described plectane is provided with some holes.
6. coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision according to claim 1, it is characterised in that: described transparent pressure glass tubing outer wall posts twice with reference to scale, twice with reference to scale minimum scale respectively millimeter with centimetre.
7. one kind adopts the method that in the claims 1-6, arbitrary described coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision carries out coal bed gas well pit shaft internal drainage gas production visual Simulation, it is characterised in that comprise the steps:
1), coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision is assembled；
2), travel(l)ing rest initial level is placed；Lift up rack body upper end steel wire rope, open the banking pin of rack body lower end brake castor simultaneously；Steel wire rope lifts up, and coordinates brake castor, regulates pit shaft analog to determining angle, then fixes steel wire rope, and brake castor inserts banking pin, keeps angle of inclination to stablize constant；
3), with reference to scale inside water tank, quantitative clear water is added；Or according to coal bed gas well field working conditions, choose appropriate particle size coal dust, add in water tank, mix the solidliquid mixture determining volumetric concentration；
4), open vent valve and liquid-filling valve, close eduction valve, flow divider, open water pump and set liquid measure by controlling terminal toward injecting in pit shaft analog, be then turned off water pump；
5), selecting gas line flow process, atm number selects vortex-shedding meter and large-capacity valve branch road, and little tolerance selects spinner flowmeter and low discharge valve branch road；Close total gas injection valve, large-capacity valve, low discharge valve, the output port pressure of pressure regulator valve is adjusted to minimum, close gas storage pot valve；By controlling terminal control air compressor, gas injection in air accumulator, after reaching setup pressure value in air accumulator, air compressor is automatically stopped active standby；When gas storage pressure inside the tank is lower than 1Mpa, air compressor automatically turns on again；
6), select to open low discharge valve or large-capacity valve according to gas flow size；Open gas storage pot valve and total gas injection valve, keep the minimum aperture of vent valve；Regulation and control pressure regulator valve output port pressure, utilizes pressure regulator valve output port and the pressure reduction conveying gas in pit shaft analog；
7), pressure in pit shaft analog, regulation and control vent valve aperture and pressure regulator valve output port pressure are observed, it is achieved under the premise that in pit shaft analog, pressure is constant, gas flow increases；Control terminal and open the built-in thermostat of top connection and lower contact, change analog temperature in pit shaft analog；
8), regulate eduction valve aperture, utilize fluid flowmeter to observe liquid phase stream outflow, open water pump simultaneously, open and regulate eduction valve, make liquid inject effusion meter consistent with the show value of fluid flowmeter；
9), gas, liquid, solid multiphase flow flow condition in pit shaft analog is observed；Change one or several parameter in temperature, pressure, liquid measure, tolerance, hole deviation, coal bed gas well borehole size feature, observe the change of multiphase flow flow condition.
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