CN111810145B - Experimental device for simulating coal dust carried in deep coal seam shaft - Google Patents
Experimental device for simulating coal dust carried in deep coal seam shaft Download PDFInfo
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- CN111810145B CN111810145B CN202010722655.5A CN202010722655A CN111810145B CN 111810145 B CN111810145 B CN 111810145B CN 202010722655 A CN202010722655 A CN 202010722655A CN 111810145 B CN111810145 B CN 111810145B
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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
- E21B49/08—Obtaining fluid samples or testing fluids, in 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
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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
- E21B47/06—Measuring temperature or pressure
Abstract
The invention discloses an experimental device for simulating coal dust carried by a deep coal seam shaft. According to the experimental device for simulating the coal dust carried by the deep coal seam shaft, a one-to-one model is built according to the shaft for developing the deep coal seam gas, the underground operation environment of the deep coal seam gas is perfectly simulated in terms of the size, the motion rule of a gas-solid mixture and a liquid-solid mixture in the shaft, the descending pressure difference of the shaft and the like, a transparent pipe with good observability is used as a model pipe column for simulating a sleeve and an oil pipe, and the motion rule of the shaft for effectively obtaining the coal dust carried by the deep coal seam gas and the motion rule of the coal dust carried by the liquid under the operation environment is convenient for developing the deep coal seam more efficiently.
Description
Technical Field
The invention relates to the technical field of coalbed methane exploitation, in particular to an experimental device for simulating coal dust carried in a deep coalbed shaft.
Background
In the coal bed gas exploitation process, on the one hand, because the reservoir pressure is higher, the interlaminar drainage rate is faster for the working fluid level is lower than the reservoir, and the reservoir is carried to the well head by oil jacket annular space along with the output of coal bed gas under naked environment easily, if coal bed gas carries buggy too much will lead to instrument equipment such as manometer to be stopped up, for the production operation of coal bed gas has brought inconvenience, on the other hand, partial buggy can be impacted into oil pipe along with the coal bed liquid, if the buggy volume that produces liquid and carry is too much, probably lead to card pump phenomenon to take place for the coal bed gas well can not normally operate, if carry the buggy too little, buggy pile up the shaft bottom and also can cause the injury to the reservoir. Therefore, the rule that coal bed gas carries pulverized coal and production fluid carries pulverized coal under annular conditions needs to be found out so as to develop deep coal beds more efficiently.
The development of the deep coal bed is the latest development direction of the coal bed gas, but for the deep coal bed, the reservoir is buried deeply, and the law of coal bed gas and liquid production carrying coal dust movement is difficult to find by virtue of on-site observation in the underground operation environment.
Therefore, how to obtain the movement rule of coal bed gas and produced liquid carrying coal powder in the working environment of the shaft so as to develop the deep coal bed more efficiently becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides an experimental device for simulating coal dust carried by a deep coal seam shaft so as to obtain a movement rule of coal seam gas and produced liquid in the shaft working environment, thereby being convenient for developing the deep coal seam more efficiently.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an experimental device for simulating coal dust carried by a deep coal seam shaft comprises a first supply assembly for providing a gas-solid mixture, a second supply assembly for providing a liquid-solid mixture, a shaft assembly and a support frame, wherein the upper end surface of the support frame is provided with a through hole,
the wellbore assembly includes:
a sucker rod;
the screen pipe is arranged on the lower end face of the supporting frame and is communicated with the through hole;
the oil pipe is sleeved on the sucker rod and is arranged on the upper end face of the supporting frame, the oil pipe is communicated with the sieve tube through the through hole, and a first annular space is formed between the oil pipe and the sucker rod;
the tail pipe is sleeved on the screen pipe and connected with the lower end face of the supporting frame, a second annular space is formed between the screen pipe and the tail pipe, a first inlet is formed in the tail pipe, and the first inlet is connected with the second supply assembly;
the sleeve pipe, the cover is established on the oil pipe and with the up end of support frame is connected, the sleeve pipe with form the third annular space between the oil pipe, the third annular space passes through the support frame with the second annular space separates, the sheathed tube lower extreme is provided with the second import, the second import with first supply assembly is connected, sheathed tube upper end is provided with and is used for the discharge gas-solid mixture's export, sheathed tube top is provided with and is used for the shutoff the closing cap of third annular space, set up on the closing cap with oil pipe complex mounting hole, the sleeve pipe with oil pipe is the transparent pipe.
Preferably, in the experimental device for simulating coal dust carried by the deep coal seam shaft, the shaft assembly further comprises a gas recovery assembly,
the gas recovery assembly includes:
a first recovery bottle;
a first gas pressure gauge;
the first transparent pipe, the one end of first transparent pipe with exit linkage, the other end of first transparent pipe with first recovery bottle is connected, set up on the first transparent pipe first gas pressure gauge.
Preferably, in the experimental device for simulating coal dust carried by a deep coal seam shaft, the gas recovery assembly further comprises a throttle valve arranged in the first transparent pipe, and the throttle valve is positioned downstream of the first gas pressure gauge.
Preferably, in the experimental device for simulating coal dust carried by the deep coal seam shaft, the shaft assembly further comprises a liquid-solid recovery assembly,
the liquid-solid recovery assembly includes:
a recovery pool;
a first thermometer;
the second transparent pipe, the one end of second transparent pipe with the top of oil pipe is connected, the other end of second transparent pipe with retrieve pond intercommunication, set up on the second transparent pipe the first thermometer.
Preferably, in the experimental device for simulating coal dust carried by a deep coal seam shaft, the shaft assembly further comprises an annular gas-collecting cavity, the annular gas-collecting cavity is mounted on the upper end face of the supporting frame, the annular gas-collecting cavity is sleeved on the sleeve, the inner cavity of the annular gas-collecting cavity is communicated with the second inlet, a third inlet is formed in the annular gas-collecting cavity, the third inlet is connected with the first supply assembly, and a second gas pressure gauge is arranged on the annular gas-collecting cavity;
and a third gas pressure gauge is arranged on the side wall of the sleeve.
Preferably, in the experimental apparatus for simulating coal dust carried by a deep coal seam shaft, the first supply assembly includes:
a gas cylinder;
a blower;
a first valve;
a first gas flow meter;
the third transparent pipe, the one end of third transparent pipe with the gas cylinder is connected, the other end of third transparent pipe with third access connection, the third transparent pipe sets gradually along the flow direction of gas the air-blower first valve with first gas flowmeter, set up the opening that is used for adding buggy on the third transparent pipe, be provided with the apron on the opening, the opening is located the low reaches of first gas flowmeter.
Preferably, in the experimental device for simulating coal dust carried by the deep coal seam shaft, the first supply assembly further comprises a first adjusting assembly for adjusting the flow rate of the gas-solid mixture,
the first pressure regulating component comprises a second valve, a second recovery bottle and a fourth transparent tube,
one end of the fourth transparent pipe is connected with the second recovery bottle, the other end of the fourth transparent pipe is connected with the third transparent pipe, and the connection position of the fourth transparent pipe and the third transparent pipe is located between the blower and the first valve.
Preferably, in the experimental device for simulating coal dust carried by the deep coal seam shaft, the second supply assembly comprises a temperature control water tank, a water pump, a third valve, a liquid pressure gauge, a second thermometer, a liquid flowmeter and a fifth transparent pipe,
the water pump is positioned in the temperature-controlled water tank, the temperature-controlled water tank is communicated with the second transparent pipe,
one end of the fifth transparent pipe is connected with the water pump, the other end of the fifth transparent pipe is connected with the first inlet, and the third valve, the liquid pressure gauge, the second thermometer and the liquid flowmeter are sequentially arranged on the fifth transparent pipe along the flowing direction of liquid.
Preferably, in the experimental device for simulating coal dust carried by the deep coal seam shaft, the second supply assembly further comprises a second adjusting assembly for adjusting the flow rate of the liquid-solid mixture,
the second adjustment assembly includes:
a fourth valve;
and one end of the sixth transparent pipe is connected with the temperature control water tank, the other end of the sixth transparent pipe is connected with the fifth transparent pipe, and the connection position of the sixth transparent pipe and the fifth transparent pipe is positioned between the water pump and the third valve.
Preferably, in the experimental device for simulating the coal dust carried by the deep coal seam shaft, the second inlet is provided with a one-way valve.
According to the technical scheme, the experimental device for simulating the coal dust carrying of the deep coal seam shaft provided by the invention comprises a first supply assembly, a second supply assembly, a shaft assembly and a support frame, wherein the support frame is used for supporting the shaft assembly. The experimental device for simulating the coal dust carried by the deep coal seam shaft can simulate two lines of gas carried coal dust and liquid carried coal dust. The gas-carried pulverized coal line is used for feeding a mixture of gas and pulverized coal into a second inlet of the shaft assembly by the first supply assembly and observing the rule of carrying pulverized coal by the gas in the third annulus; the liquid carrying pulverized coal line is used for feeding a mixture of liquid and pulverized coal into a first inlet of the shaft by the second supply assembly, and observing the rule that the liquid carrying pulverized coal is carried in the first annular space and the second annular space. According to the experimental device for simulating the coal dust carried by the deep coal seam shaft, a one-to-one model is built according to the shaft for developing the deep coal seam gas, the underground operation environment of the deep coal seam gas is perfectly simulated in terms of the size, the motion rule of a gas-solid mixture and a liquid-solid mixture in the shaft, the descending pressure difference of the shaft and the like, a transparent pipe with good observability is used as a model pipe column for simulating a sleeve and an oil pipe, and the motion rule of the shaft for effectively obtaining the coal dust carried by the deep coal seam gas and the motion rule of the coal dust carried by the liquid under the operation environment is convenient for developing the deep coal seam more efficiently.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of an experimental device for simulating coal dust carried in a deep coal seam wellbore according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a wellbore assembly according to an embodiment of the present disclosure.
1. Gas cylinder, 2, blower, 3, first valve, 4, first gas flow meter, 5, cover plate, 6, wellbore assembly, 7, first gas pressure meter, 8, throttle valve, 9, first recovery bottle, 10, second valve, 11, second recovery bottle, 12, temperature controlled sink, 13, water pump, 14, fourth valve, 15, third valve, 16, liquid pressure meter, 17, second thermometer, 18-liquid flow meter, 19, first thermometer, 20, third transparent tube, 21, fourth transparent tube, 22, first transparent tube, 23, fifth transparent tube, 24, sixth transparent tube, 25, second transparent tube, 601, leg, 602, support plate, 603, annular gas gathering chamber, 604, third inlet, 605, check valve, 606, tailpipe, 607, first inlet, 608, screen pipe, 609, second gas pressure meter, 610, sleeve, 611, oil pipe, 612, sucker rod, 613, seal cap, 614, third gas pressure meter; 615. and an outlet.
Detailed Description
The invention discloses an experimental device for simulating coal dust carried by a deep coal seam shaft, which is used for obtaining a movement rule of coal bed gas and produced liquid in the shaft operation environment, so that the deep coal seam can be developed more efficiently.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Please refer to fig. 1-2. The invention discloses an experimental device for simulating coal dust carried by a deep coal seam shaft, which comprises a first supply assembly, a second supply assembly, a shaft assembly 6 and a supporting frame.
Wherein, the first supply assembly is used for supplying gas-solid mixture to the shaft assembly 6, the second supply assembly is used for supplying liquid-solid mixture to the shaft assembly 6, the shaft assembly 6 is used for simulating the movement of gas-carried pulverized coal and liquid-carried pulverized coal, and the support frame is used for supporting the shaft assembly 6.
The through hole has been seted up to the up end of support frame, and the lower extreme of support frame can be located on workstation or subaerial. The support frame is used for making pit shaft subassembly 6 stand vertically on workstation or ground, and pit shaft subassembly 6 is perpendicular with the up end of support frame.
In one embodiment of the present solution, the support frame comprises a support plate 602 and a leg 601, the support plate 602 is provided with a through hole, the shaft assembly 6 is vertically mounted on the support plate 602, the leg 601 is connected with the lower end surface of the support plate 602, and the leg 601 can be located on a workbench or the ground.
As shown in fig. 1 and 2, wellbore assembly 6 includes sucker rod 612, screen 608, tubing 611, tailpipe 606, and casing 610.
The sucker rod 612, the oil pipe 611 and the sleeve 610 are installed on the upper end surface of the support frame, specifically, the sucker rod 612, the oil pipe 611 and the sleeve 610 are installed on the upper end surface of the support plate 602 and are communicated with the through holes, the sucker rod 612, the oil pipe 611 and the sleeve 610 are sequentially sleeved and connected from inside to outside, a first annular space is formed between the sucker rod 612 and the oil pipe 611, and a third annular space is formed between the oil pipe 611 and the sleeve 610;
The second annulus and the third annulus are separated by a support plate 602 of the support frame, the second annulus and the third annulus not being in communication.
The lower end of the sleeve 610 is provided with a second inlet, which is connected to a first supply assembly, through which the gas-solid mixture supplied by the first supply assembly can be supplied to the third annulus, and the upper end of the sleeve 610 is provided with an outlet 615 for discharging the gas-solid mixture in the third annulus.
Specifically, the first supply assembly supplies the gas-solid mixture into the third annulus, and the pulverized coal in the gas-solid mixture moves upwards along with the gas in the gas-solid mixture in the third annulus and is finally discharged through the outlet 615 of the sleeve 610, and the process is used for simulating the gas-carried pulverized coal;
the second feed assembly feeds a liquid-solid mixture into the tailpipe 606, the liquid-solid mixture passes through the screen 608 and enters a first annulus between the oil pipe 611 and the sucker rod 612, the liquid-solid mixture moves upwards along the first annulus under the action of the sucker rod 612 and finally is discharged through the upper end of the oil pipe 611, and the process is used for simulating liquid-carried pulverized coal.
In the scheme, the sleeve 610 and the oil pipe 611 are transparent pipes, so that the coal powder movement rules of the first annular space and the third annular space can be conveniently observed.
The top end of the sleeve 610 is provided with a cover 613 for sealing the third annulus, so as to prevent the gas-solid mixture in the third annulus from being ejected from the upper end of the third annulus.
The cover 613 is provided with a mounting hole for passing the upper end of the oil supply pipe 611. The cap 613 functions not only to seal off the third annulus but also to secure the tubing 611 within the casing 610, the cap 613 simulating a setting tool in a coalbed methane wellbore in the wellbore assembly 6. The outlet 615 is located 100mm below the cover 613 in this embodiment.
The experimental device for simulating the coal dust carried by the deep coal seam shaft can simulate two lines of gas carried coal dust and liquid carried coal dust.
Air-carried pulverized coal line:
the first supply assembly supplies a gas and coal dust mixture (the gas and coal dust mixture is the gas-solid mixture described above) to the second inlet of the shaft assembly 6, and the law that the gas carries coal dust in the third annulus is observed;
liquid carrying pulverized coal line:
the second supply assembly supplies a mixture of liquid and pulverized coal (the mixture of liquid and pulverized coal is a liquid-solid mixture as described above) to the first inlet 607 of the wellbore observing the laws of carrying pulverized coal with the first and second annular liquids.
According to the experimental device for simulating the coal dust carried by the deep coal seam shaft, a one-to-one model is built according to the shaft for developing the deep coal seam gas, the underground operation environment of the deep coal seam gas is perfectly simulated in terms of the size, the motion rule of a gas-solid mixture and a liquid-solid mixture in the shaft, the descending pressure difference of the shaft and the like, and a transparent pipe with good observability is used as a model pipe column for simulating the sleeve 610 and the oil pipe 611, so that the motion rule of the shaft for effectively obtaining the deep coal seam gas, the coal dust carried by the gas and the coal dust carried by the liquid in the operation environment is convenient for developing the deep coal seam more efficiently.
In practical simulation, the pipeline of the gas-carried pulverized coal and the liquid-carried pulverized coal are not simultaneously opened, specifically, when the experiment of the gas-carried pulverized coal is carried out, the third valve is closed, the liquid-solid mixture cannot be fed into the sieve tube through the first inlet 607, and when the experiment of the liquid-carried pulverized coal is carried out, the first valve is closed, and the gas-solid mixture cannot be fed into the annular gas collecting cavity through the second inlet. The gas-carried pulverized coal is completed in the third annulus (water needs to be injected into the third annulus in advance before the experiment of the gas-carried pulverized coal), the liquid-carried pulverized coal is completed in the first annulus, at the moment, the gas-carried pulverized coal and the gas-carried liquid are observed, the gas-carried pulverized coal line and the liquid-carried pulverized coal line are respectively subjected to the experiment, and the capability of carrying pulverized coal by gases with different pressures and the capability of carrying pulverized coal by liquids with different flow rates and different temperatures are simulated.
In order to further optimize the above technical solution, the shaft assembly 6 disclosed in the present solution further comprises a gas recovery assembly for recovering the gas used in the gas-carried pulverized coal line.
Preferably, the gas used in the gas carrying pulverized coal line is methane. Because methane is combustible gas, the risk of explosion exists in the air after diffusion, and the methane is recovered through the gas recovery component, so that the safety of an experimental environment can be ensured.
In one particular embodiment of the present solution, the gas recovery assembly comprises a first recovery bottle 9, a first gas pressure gauge 7 and a first transparent tube 22.
One end of the first transparent tube 22 is connected to the outlet 615, and the other end of the first transparent tube 22 is connected to the first recovery bottle 9. After the gas-solid mixture enters the third annulus, the methane carries the pulverized coal upward and is eventually expelled through outlet 615. The first transparent pipe 22 recovers the methane discharged through the outlet 615 into the first recovery bottle 9.
The first gas pressure gauge 7 is disposed on the first transparent pipe 22, and is used for measuring the gas pressure in the first transparent pipe 22, so as to observe the gas pressure discharged from the third annulus, and judge the capability of carrying pulverized coal under different gas pressure conditions.
In order to further optimize the technical scheme, the gas recovery assembly disclosed by the scheme further comprises a throttle valve 8 so as to carry out pressure drop experiments of the gas-carried pulverized coal of different throttle valves.
The oil pipe 611 is disposed within the first transparent pipe 22, and the oil pipe 611 is located downstream of the first gas pressure gauge 7.
In this scheme, the first transparent pipe 22 is a sub-gram force pipe with the specification of CN110, the first transparent pipe 22 is in threaded connection with the outlet 615, the first gas pressure gauge 7 is connected to the first transparent pipe 22 at a position which is 615100mm away from the outlet, and the throttle valve 8 with the specification of CN110 is installed at a position which is 615500mm away from the outlet by the first transparent pipe 22.
Here, the upstream and downstream are the upstream direction of the first transparent tube 22 with respect to the flow direction of the gas-solid mixture in the first transparent tube 22, and the downstream direction of the first transparent tube 22 is the end of the gas-solid mixture close to the outlet 615, which is the upstream direction of the first transparent tube 22, with respect to the flow direction of the gas-solid mixture in the first transparent tube 22, from the outlet 615 to the first recovery bottle 9.
The wellbore assembly 6 of the present disclosure further includes a liquid-solid recovery assembly for recovering the liquid-solid mixture exiting from the first annulus, avoiding the liquid-solid mixture from being directly discharged from the tubing 611, contaminating the work table.
In one particular embodiment of the present solution, the liquid-solid recovery assembly includes a recovery tank, a first thermometer 19 and a second transparent tube 25.
The liquid-solid mixture exiting the first annulus is discharged through a second transparent tube 25 to a recovery tank.
The top end of the oil pipe 611 is connected to the recovery tank by a sub-gram force pipe of the specification CN 35.
The first thermometer 19 is used to detect the temperature of the liquid-solid mixture exiting the first annulus. Because the temperature of water is different, the surface tension and the viscosity of water are different, so that the capability of carrying pulverized coal by water is different, and the temperature of the liquid-solid mixture is monitored, so that the capability of carrying water at different temperatures is monitored.
The wellbore assembly 6 of the present disclosure further includes an annular gas-gathering chamber 603. The annular gas-gathering chamber 603 is used to simulate the situation around the wellbore, and as a mixing chamber, mixing of gas, liquid and coal fines within the annular gas-gathering chamber is achieved, simulating the situation around the wellbore downhole.
The annular gas-collecting chamber 603 is installed at the up end of support frame, and annular gas-collecting chamber 603 cover is established on sleeve 610, and the inner chamber and the second import intercommunication of annular gas-collecting chamber 603 are equipped with third import 604 on the annular gas-collecting chamber 603, and third import 604 is connected with first supply assembly.
The gas-solid mixture supplied by the first supply assembly first enters the annular gas-collecting chamber 603 and is then supplied through the annular gas-collecting chamber 603 into the third annulus.
The present solution is provided with a second gas pressure gauge 609 on the annular gas gathering chamber 603 for detecting the downhole pressure. A third gas gauge 614 is provided on the sidewall of the sleeve 610.
In one particular embodiment of the present solution, the first supply assembly comprises a gas cylinder 1, a blower 2, a first valve 3, a first gas flow meter 4 and a third transparent tube 20.
One end of a third transparent pipe 20 is connected with the gas cylinder 1, the other end of the third transparent pipe 20 is connected with the second inlet, the third transparent pipe 20 is sequentially provided with the blower 2, the first valve 3 and the first gas flowmeter 4 along the flow direction of gas, an opening for adding pulverized coal is formed in the third transparent pipe 20, a cover plate 5 is arranged on the opening, and the opening is located at the downstream of the first gas flowmeter 4.
The blower 2 gives methane power to form an initial flow;
the first valve 3 controls the initial flow rate and the pressure of methane;
the first gas flow meter 4 collects flow data of the gas.
Preferably, the first valve 3 is a pneumatic flanged ball valve.
The first gas flowmeter 4 is arranged close to the second inlet, and the acquired flow data of the gas are more accurate.
In this embodiment, an opening is formed in the third transparent tube 20, and a cover plate 5 is disposed on the opening. Before the blower 2 is turned on, the cover plate 5 is opened, pulverized coal is put into the third transparent tube 20 through the opening, and the cover plate 5 can seal the opening. Preferably, the aperture of the opening is 20mm.
In the scheme, a subcritical force pipe between the blower 2 and the pneumatic flange ball valve is a subcritical force pipe with a splicing specification of CN 70.
The first gas flow meter 4 is located upstream of the opening.
Here, the upstream and downstream are the upstream direction with reference to the flow direction of the gas in the third transparent tube 20, the gas is supplied from the gas cylinder 1 to the second inlet, the end near the gas cylinder 1 is the upstream direction, and the end near the second inlet is the downstream direction.
In a specific embodiment of the solution, the blower 2, the first valve 3 and the first gas flow meter 4 are all flange-connected with the third transparent tube 20.
In order to further optimize the technical solution, the first supply assembly further comprises a first adjusting assembly for adjusting the flow rate of the gas-solid mixture fed into the second inlet.
The first adjustment assembly comprises a second valve 10, a second recovery bottle 11 and a fourth transparent tube 21.
The second valve 10 is used to control the flow of the gas-solid mixture of the fourth transparent tube 21, preferably the second valve 10 is an actuating flanged ball valve.
One end of the fourth transparent tube 21 is connected to the second recovery bottle 11, the other end of the fourth transparent tube 21 is connected to the third transparent tube 20, and the connection position of the fourth transparent tube 21 and the third transparent tube 20 is located between the blower 2 and the first valve 3.
When the pressure of the gas-solid mixture fed into the second inlet exceeds the experimental pressure, the second valve 10 is opened, the gas-solid mixture is fed into the second recovery bottle 11 through the fourth transparent tube 21 to form a release loop, and the initial flow rate and the flow pressure of the gas-solid mixture can be controlled.
In one particular embodiment of the present solution, the second supply assembly comprises a temperature controlled water tank 12, a water pump 13, a third valve 15, a liquid pressure gauge, a second thermometer, a liquid flow meter 18 and a fifth transparent tube 23.
The water pump 13 is positioned in the temperature control water tank 12, and the water pump 13 can pump water in the temperature control water tank 12 to enter the fifth transparent pipe 23, and in the scheme, coal dust is put in the temperature control water tank 12;
the third valve 15 is preferably a solenoid valve;
the liquid pressure gauge 16 is used for measuring the pressure of the liquid-solid mixture;
the second thermometer is used for measuring the temperature of the liquid-solid mixture before entering the well;
the liquid flow meter 18 is used to measure the flow rate of the liquid-solid mixture.
In the experiment, the flow rate and pressure of the liquid mixture are regulated by the third valve 15, and the temperature of the liquid-solid mixture is controlled by the temperature-controlled water tank 12.
One end of the fifth transparent pipe 23 is connected with the water pump 13, the other end of the fifth transparent pipe 23 is connected with the first inlet 607, and the third valve 15, the liquid pressure gauge 16, the second thermometer and the liquid flowmeter 18 are sequentially arranged on the fifth transparent pipe 23 along the flowing direction of the liquid.
The temperature control water tank is connected with the water pump 13 through an acrylic pipe with the specification of CN 35.
In this scheme, the liquid-solid recovery assembly and the second supply assembly share a temperature control water tank 12, namely the liquid-solid mixture recovered by the liquid-solid recovery assembly can enter the temperature control water tank 12, and the source of the liquid-solid mixture supplied by the second supply assembly is also the temperature control water tank 12.
The second supply assembly further includes a second adjustment assembly for adjusting the flow and pressure of the liquid-solid mixture fed into the second annulus.
The second adjustment assembly includes a fourth valve 14 and a sixth transparent tube 24.
One end of the sixth transparent pipe 24 is connected to the temperature-controlled water tank 12, the other end of the sixth transparent pipe 24 is connected to the fifth transparent pipe 23, and the connection position of the sixth transparent pipe 24 and the fifth transparent pipe 23 is located between the water pump 13 and the third valve 15.
Preferably, the oil pipe 611, the sleeve 610, the first transparent pipe 22, the second transparent pipe 25, the third transparent pipe 20, the fourth transparent pipe 21, the fifth transparent pipe 23 and the sixth transparent pipe 24 in this embodiment are all sub-gram force pipes.
In this embodiment, a check valve 605 is provided at the second inlet to prevent backflow of fluid in the third annulus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An experimental device for simulating coal dust carried by a deep coal seam shaft is characterized by comprising a first supply assembly for providing a gas-solid mixture, a second supply assembly for providing a liquid-solid mixture, a shaft assembly (6) and a support frame, wherein the upper end surface of the support frame is provided with a through hole,
the wellbore assembly (6) comprises:
-a sucker rod (612);
a sieve tube (608) which is arranged on the lower end surface of the supporting frame and is communicated with the through hole;
the oil pipe (611) is sleeved on the sucker rod (612) and is arranged on the upper end face of the supporting frame, the oil pipe (611) is communicated with the sieve tube (608) through the through hole, and a first annular space is formed between the oil pipe (611) and the sucker rod (612);
the tail pipe (606) is sleeved on the screen pipe (608) and connected with the lower end face of the supporting frame, a second annular space is formed between the screen pipe (608) and the tail pipe (606), a first inlet (607) is formed in the tail pipe (606), and the first inlet (607) is connected with the second supply assembly;
the sleeve (610) is sleeved on the oil pipe (611) and is connected with the upper end face of the supporting frame, a third annular space is formed between the sleeve (610) and the oil pipe (611), the third annular space is separated from the second annular space through the supporting frame, a second inlet is formed in the lower end of the sleeve (610), the second inlet is connected with the first supply assembly, an outlet (615) for discharging the gas-solid mixture is formed in the upper end of the sleeve (610), a sealing cover (613) for sealing the third annular space is arranged at the top end of the sleeve (610), a mounting hole matched with the oil pipe (611) is formed in the sealing cover (613), and the sleeve (610) and the oil pipe (611) are transparent pipes;
when the air-carried pulverized coal experiment is carried out, the air-carried pulverized coal is completed in the third annulus; and when the liquid carrying pulverized coal experiment is carried out, the liquid carrying pulverized coal is completed in the first annular space.
2. An experimental device for simulating coal fines carried by a deep coal seam wellbore in accordance with claim 1, wherein the wellbore assembly (6) further comprises a gas recovery assembly,
the gas recovery assembly includes:
a first recovery bottle (9);
a first gas pressure gauge (7);
the first transparent pipe (22), one end of first transparent pipe (22) with export (615) are connected, the other end of first transparent pipe (22) with first recovery bottle (9) are connected, set up on first transparent pipe (22) first gas pressure gauge (7).
3. An experimental device for simulating coal-carrying capacity of a deep coal seam wellbore according to claim 2, wherein the gas recovery assembly further comprises a throttle valve (8) disposed within the first transparent tube (22), the throttle valve (8) being located downstream of the first gas pressure gauge (7).
4. An experimental device for simulating coal fines carried by a deep coal seam wellbore in accordance with claim 1, wherein the wellbore assembly (6) further comprises a liquid-solid recovery assembly,
the liquid-solid recovery assembly includes:
a recovery pool;
a first thermometer (19);
the second transparent pipe (25), the one end of second transparent pipe (25) with the top of oil pipe (611) is connected, the other end of second transparent pipe (25) with retrieve pond intercommunication, set up on second transparent pipe (25) first thermometer (19).
5. The experimental device for simulating coal dust carrying of a deep coal seam well bore according to claim 1, wherein the well bore assembly (6) further comprises an annular gas-collecting chamber (603) which is installed on the upper end face of the supporting frame, the annular gas-collecting chamber (603) is sleeved on the sleeve (610), the inner cavity of the annular gas-collecting chamber (603) is communicated with the second inlet, a third inlet (604) is arranged on the annular gas-collecting chamber (603), the third inlet (604) is connected with the first supply assembly, and a second gas pressure gauge (609) is arranged on the annular gas-collecting chamber (603);
a third gas pressure gauge (614) is provided on the sidewall of the sleeve (610).
6. An experimental apparatus for simulating a coal-bearing deep coal seam wellbore according to claim 5, wherein the first supply assembly comprises:
a gas cylinder (1);
a blower (2);
a first valve (3);
a first gas flow meter (4);
the gas-fired boiler comprises a third transparent pipe (20), wherein one end of the third transparent pipe (20) is connected with a gas cylinder (1), the other end of the third transparent pipe (20) is connected with a third inlet, the third transparent pipe (20) is sequentially provided with a blower (2) along the flowing direction of gas, a first valve (3) and a first gas flowmeter (4), an opening for adding pulverized coal is formed in the third transparent pipe (20), a cover plate (5) is arranged on the opening, and the opening is located at the downstream of the first gas flowmeter (4).
7. An experimental apparatus for simulating coal-bearing formation of a deep coal seam wellbore of claim 6, wherein the first supply assembly further comprises a first adjustment assembly for adjusting a flow rate of the gas-solids mixture,
the first adjusting component comprises a second valve (10), a second recovery bottle (11) and a fourth transparent tube (21),
one end of the fourth transparent pipe (21) is connected with the second recovery bottle (11), the other end of the fourth transparent pipe (21) is connected with the third transparent pipe (20), and the connection position of the fourth transparent pipe (21) and the third transparent pipe (20) is located between the blower (2) and the first valve (3).
8. An experimental device for simulating a coal-bearing deep coal seam wellbore according to claim 1, wherein the second supply assembly comprises a temperature-controlled water tank (12), a water pump (13), a third valve (15), a liquid pressure gauge (16), a second thermometer (17), a liquid flow meter (18) and a fifth transparent tube (23),
the water pump (13) is positioned in the temperature control water tank (12), the temperature control water tank (12) is communicated with the second transparent pipe (25),
one end of the fifth transparent pipe (23) is connected with the water pump (13), the other end of the fifth transparent pipe (23) is connected with the first inlet (607), and the third valve (15), the liquid pressure gauge (16), the second thermometer (17) and the liquid flowmeter (18) are sequentially arranged on the fifth transparent pipe (23) along the flowing direction of liquid.
9. An experimental apparatus for simulating coal-bearing formation of a deep coal seam wellbore in accordance with claim 8, wherein the second supply assembly further comprises a second adjustment assembly for adjusting the flow rate of the liquid-solid mixture,
the second adjustment assembly includes:
a fourth valve (14);
and a sixth transparent pipe (24), wherein one end of the sixth transparent pipe (24) is connected with the temperature control water tank (12), the other end of the sixth transparent pipe (24) is connected with the fifth transparent pipe (23), and the connection position of the sixth transparent pipe (24) and the fifth transparent pipe (23) is positioned between the water pump (13) and the third valve (15).
10. An experimental device for simulating coal fines-carrying in a deep coal seam wellbore according to claim 1, wherein the second inlet is provided with a one-way valve (605).
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