CN114059972B - Be used for coal bed gas negative pressure to take out and adopt analogue means - Google Patents
Be used for coal bed gas negative pressure to take out and adopt analogue means Download PDFInfo
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- CN114059972B CN114059972B CN202111404089.4A CN202111404089A CN114059972B CN 114059972 B CN114059972 B CN 114059972B CN 202111404089 A CN202111404089 A CN 202111404089A CN 114059972 B CN114059972 B CN 114059972B
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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
- 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
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Abstract
The invention discloses a negative pressure extraction simulation device for coal bed gas, which comprises a bracket, wherein a plurality of experiment box components are erected on the bracket, a coal body sample can be placed in the experiment box components, an air inlet is arranged below the experiment box components, each air inlet is connected to an external air supply bottle through an air inlet pipeline, an extraction port is arranged on the experiment box components, an extraction pipeline capable of being inserted into the coal body sample is connected to the extraction port, the extraction pipeline is connected to extraction analysis equipment, the extraction analysis equipment can provide negative pressure in the extraction pipeline, and one side of the experiment box components is provided with a feed door capable of transferring the coal body sample; and an exhaust port is further formed above the experiment box assembly and is connected into exhaust equipment through an exhaust pipeline. Compared with the prior art, the extraction efficiency of the coal body sample under the corresponding boundary condition can be analyzed, so that guidance is provided for the economic benefit of coal bed gas extraction work, the efficiency is high, the safety is good, and the variable can be flexibly adjusted.
Description
Technical Field
The invention relates to the technical field of coal bed methane exploitation experimental equipment, in particular to a negative pressure extraction simulation device for coal bed methane.
Background
Coal bed gas is a gas resource associated with coal, refers to hydrocarbon gas stored in a coal bed, takes methane as a main component, and belongs to unconventional natural gas. The coalbed methane is hydrocarbon gas which is mainly adsorbed on the surfaces of coal matrix particles, partially dissociated in coal pores or dissolved in coalbed water, is associated mineral resources of coal, and is clean and high-quality energy and chemical raw materials which are internationally grown in the last two decades. The coal bed gas can be subjected to negative pressure extraction by drilling holes on the ground and connecting extraction equipment, but the economic benefits of extraction are required to be researched and analyzed by simulation experiments before extraction due to different physical properties such as coal pores of different coal beds, coal bed gas content, coal bed boundary conditions and the like. The existing coal bed gas extraction simulation experiment device utilizes a closed container to simulate extraction of coal body samples, repeated assembly and disassembly are needed when multiple groups of experiments are carried out, the time is long, gas leakage is easy to damage safety, confining pressure and boundary conditions of the coal body samples cannot be simulated, the experiment accuracy is low, and the influence caused by the change of the coal body samples is difficult to study.
Therefore, it is necessary to provide a device for simulating the negative pressure extraction of the coalbed methane, so as to solve the problems in the background art.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a be used for coal bed gas negative pressure to take out and adopt analogue means, includes the support, wherein, set up a plurality of experiment case subassemblies on the support, can place the coal body sample in the experiment case subassembly, be the air inlet below it, every the air inlet passes through the admission line and connects to outside gas feed bottle in, be the extraction mouth on the experiment case subassembly, be connected with the extraction pipeline that can insert in the coal body sample in the extraction mouth, the extraction pipeline is connected to in the extraction analytical equipment, the extraction analytical equipment can provide the negative pressure in the extraction pipeline, the one side of experiment case subassembly is equipped with the feed gate that can shift the coal body sample;
and an exhaust port is further formed above the experiment box assembly and is connected into exhaust equipment through an exhaust pipeline.
Further, preferably, the air inlet, the extraction port and the air outlet are each provided with an air door, and the opening and closing of the air doors can be controlled.
Further, as an preference, the experiment box assembly comprises a shell, the shell is fixedly connected with the bracket, the bottom and the middle of the shell are respectively an air distribution cavity and a pressure cavity which are mutually sealed, an air inlet is arranged below the air distribution cavity, an extraction port is arranged on the pressure cavity, the pressure cavity is communicated with the air outlet, and the feeding door is arranged on the side wall of the pressure cavity;
an airflow damping component is arranged between the air distribution cavity and the pressure cavity.
Further, preferably, a guide rail perpendicular to the feeding door is fixed at the bottom of the pressure cavity and above the airflow damping component, a sliding seat is slidably arranged in the guide rail, a pressure barrel is arranged on the sliding seat, the pressure barrel can slide out of the feeding door in the guide rail so as to transfer a coal sample therein, and the extraction pipeline can penetrate into the coal sample in the pressure barrel;
and the side wall of the pressure barrel and the bottom of the sliding seat are breathable porous plates.
Further, preferably, the pressure barrel comprises two semicircular walls, the semicircular walls are slidably connected with the sliding seat, two interfaces of the semicircular walls are connected through a connecting air bag, and the connecting air bag is further connected to an external air pump for air pressure adjustment.
Further, as an optimization, each semicircular cylinder wall is provided with a hydraulic cylinder on the inner walls of two sides of the pressure cavity corresponding to the concentric position of the extraction port, and the tail end of a piston rod of the hydraulic cylinder is fixed with a fitting block capable of fitting with the outer wall of the semicircular cylinder wall.
Further, preferably, pressure sensing patches are distributed on the inner wall of the semicircular cylinder wall.
Further, preferably, the airflow damping assembly includes resistance blades, the circumference of the resistance blades is distributed in a circular groove at the bottom of the pressure cavity, the resistance blades are rotatably connected with the bottom of the pressure cavity by taking the radial direction of the circumference as a rotating shaft, and each resistance blade is mutually sealed when rotating to the horizontal.
Further, preferably, one end of the resistance blade away from the center of the circle penetrates through the circular groove at the bottom of the pressure cavity to the side wall and enters the air distribution cavity, a rotating connecting rod is fixed at the end of the resistance blade, and the other end of each rotating connecting rod is commonly connected to an adjusting ring in the air distribution cavity;
a plurality of sliding grooves are formed in the adjusting ring along the circumferential direction, and one end of the rotating connecting rod is slidably connected into the sliding grooves.
Further, preferably, connecting shafts are symmetrically fixed on two sides of the adjusting ring, the connecting shafts penetrate through the air distribution cavity to the outside of the shell, and the shell is provided with a through groove which can be used for the connecting shafts to slide up and down and pass through a soft material in a sealing manner;
the connecting shaft is connected to the damping sensing device at one end outside the shell, the damping sensing device is detachably connected with the shell, and the damping sensing device can provide damping for the up-and-down movement of the adjusting ring and can sense the pressure generated by the adjusting ring.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the hydraulic cylinder is used for applying pressure to the two semicircular cylinder walls, and the air pressure of the connecting air bag is regulated to fill the gap, so that the boundary confining pressure of the coal sample in the connecting air bag can be simulated.
According to the invention, different coal body samples with extraction holes are put into the pressure barrel of each experimental box assembly, and the air inlet and the extraction port air door corresponding to one experimental box assembly are sequentially opened, so that multiple simulation experiments can be performed after one-time installation, repeated disassembly and installation in multiple groups of comparison experiments are avoided, the efficiency and the safety of the simulation experiments are improved, and the parallel experiments can be used for analyzing the extraction efficiency of multi-wellhead parallel coal bed gas extraction of a variable coal bed mining field.
In the invention, as the pressure barrel is of a porous ventilation structure, the pressure cavity simulates the boundary of the coal seam and also generates negative pressure, so that pressure difference is generated between the pressure cavity and the gas distribution cavity, the resistance blade generates rotating torque due to the existence of the pressure difference, when the resistance blade rotates, damping is provided by the damping sensing device through the movement of the adjusting ring, the damping can be recorded by the sensor, and different damping can be provided by changing the damping sensing device so as to simulate different boundary conditions; the working conditions of extracting the coalbed methane under different pressures recorded by the damping sensing device and the extracting and analyzing equipment can analyze the extracting efficiency of the coalbed methane sample under the corresponding boundary conditions so as to provide guidance for the economic benefit of the coalbed methane extracting and extracting work.
Drawings
FIG. 1 is a schematic diagram of a negative pressure extraction simulation device for coalbed methane;
FIG. 2 is a schematic diagram of the structure of the experimental box assembly;
FIG. 3 is a schematic view of the structure of a pressure barrel;
FIG. 4 is a schematic structural view of an airflow damping assembly;
in the figure: 1. a bracket; 2. an experiment box assembly; 3. an air inlet; 4. an air intake duct; 5. a pumping port; 6. a pumping pipeline; 7. extraction analysis equipment; 8. an exhaust port; 9. an exhaust duct; 10. a feed gate; 21. a housing; 22. an air distribution cavity; 23. a pressure chamber; 24. a guide rail; 25. a slide; 26. a pressure barrel; 27. an airflow damping assembly; 28. a hydraulic cylinder; 281. a bonding block; 29. damping sensing means; 261. a semi-circular cylinder wall; 262. connecting an air bag; 271. resistance blades; 272. rotating the connecting rod; 273. an adjusting ring; 274. a chute; 275. and a connecting shaft.
Detailed Description
Referring to fig. 1, in the embodiment of the invention, a negative pressure extraction simulation device for coalbed methane comprises a bracket 1, wherein a plurality of experiment box assemblies 2 are erected on the bracket 1, a coal body sample can be placed in the experiment box assemblies 2, an air inlet 3 is arranged below the experiment box assemblies, each air inlet 3 is connected to an external air supply bottle through an air inlet pipeline 4, an extraction port 5 is arranged on the experiment box assemblies 2, an extraction pipeline 6 capable of being inserted into the coal body sample is connected in the extraction port 5, the extraction pipeline 6 is connected to extraction analysis equipment 7, negative pressure can be provided in the extraction pipeline 6 by the extraction analysis equipment 7, and a feed door 10 capable of transferring the coal body sample is arranged on one surface of the experiment box assemblies 2;
an exhaust port 8 is further formed above the experiment box assembly 2, and the exhaust port 8 is connected to exhaust equipment through an exhaust pipeline 9;
in this embodiment, the air inlet 3, the extraction port 5 and the exhaust port 8 are all provided with air doors, so that the opening and closing of the air doors can be controlled.
Referring to fig. 2, in this embodiment, the experimental box assembly 2 includes a housing 21, the housing 21 is fixedly connected with the support 1, a gas distribution chamber 22 and a pressure chamber 23 which are sealed with each other are respectively arranged at the bottom and the middle of the housing 21, a gas inlet 3 is arranged below the gas distribution chamber 22, a suction port 5 is arranged on the pressure chamber 23, the pressure chamber 23 is communicated with the gas outlet 8, and the feeding door 10 is arranged on the side wall of the pressure chamber 23;
an airflow damping assembly 27 is arranged between the air distribution cavity 22 and the pressure cavity 23.
In this embodiment, a guide rail 24 perpendicular to the feeding door 10 is fixed at a position above the air flow damping assembly 27 at the bottom of the pressure chamber 23, a sliding seat 25 is slidably disposed in the guide rail 24, a pressure barrel 26 is disposed on the sliding seat 25, the pressure barrel 26 can slide out of the feeding door 10 in the guide rail 24 to transfer the coal sample therein, and the extraction pipeline 6 can penetrate into the coal sample in the pressure barrel 26;
the side wall of the pressure barrel 26 and the bottom of the sliding seat 25 are air-permeable porous plates;
that is, when the extraction pipe 6 performs negative pressure extraction on the coal sample in the pressure barrel 26, it can generate negative pressure in the pressure chamber 23 through the coal sample and the pressure barrel 26, and generate negative pressures of different magnitudes in the pressure chamber 23 due to different penetration capacities of different coal samples to the air flow, so as to analyze the physical properties of the coal sample.
Referring to fig. 3, in the present embodiment, the pressure barrel 26 includes two semi-cylindrical walls 261, the semi-cylindrical walls 261 are slidably connected with the slide 25, two interfaces of the semi-cylindrical walls 261 are connected by a connecting air bag 262, and the connecting air bag 262 is further connected to an external air pump for air pressure adjustment.
In this embodiment, each of the semicircular walls 261 is provided with a hydraulic cylinder 28 on the inner wall of each of the two sides of the pressure chamber 23 corresponding to the concentric position of the extraction port 5, and a bonding block 281 capable of bonding with the outer wall of the semicircular wall 261 is fixed at the end of the piston rod of the hydraulic cylinder 28;
that is, when the pressure barrel 26 is moved to a position concentric with the extraction port 5, pressure can be applied to both half-cylinder walls 261 thereof by the hydraulic cylinder 28, and the space is filled by adjusting the air pressure of the connecting air bag 262 to simulate the boundary confining pressure of the coal sample therein.
In this embodiment, pressure sensing patches are distributed on the inner wall of the semi-circular cylinder wall 261.
In this embodiment, the airflow damping assembly 27 includes a resistance blade 271, where the resistance blade 271 is circumferentially distributed in a circular groove at the bottom of the pressure chamber 23, and is rotatably connected to the bottom of the pressure chamber 23 by using a radial direction of the circumference as a rotation axis, and each resistance blade 271 is sealed when rotated to a horizontal direction.
In this embodiment, one end of the resistance vane 271 far away from the center of the circle penetrates through the circular groove at the bottom of the pressure chamber 23 to the side wall and enters the air distribution chamber 22, and a rotating connecting rod 272 is fixed at the end, and the other end of each rotating connecting rod 272 is commonly connected to an adjusting ring 273 in the air distribution chamber 22;
a plurality of sliding grooves 274 are formed in the adjusting ring 273 along the circumferential direction, and one end of the rotating connecting rod 272 is slidably connected to the sliding grooves 274;
that is, when the pressure difference is generated between the valve chamber 22 and the pressure chamber 23, the resistance vane 271 rotates and moves the adjustment ring 273.
In this embodiment, the two sides of the adjusting ring 273 are symmetrically fixed with connecting shafts 275, the connecting shafts 275 penetrate through the air distribution cavity 22 to the outside of the housing 21, and the housing 21 is provided with a through groove capable of allowing the connecting shafts to slide up and down and pass through the soft material to be sealed;
the connecting shaft 275 is connected to a damping sensor 29 at one end outside the housing 21, the damping sensor 29 is detachably connected to the housing 21, and the damping sensor 29 is capable of damping the up-and-down movement of the adjustment ring 273 and sensing the pressure generated by the damping sensor 29;
that is, the rotation of the resistance vane 271 is damped by the damping sensor 29 by movement of the adjustment ring 273, and the damping can be registered by the sensor.
In the concrete implementation, different coal body samples subjected to extraction hole punching are put into the pressure barrel 26 of each experiment box assembly 2 through the feed gate 10, and are moved to a position concentric with the extraction port 5 in the guide rail 24, and the extraction pipeline 6 is filled into the extraction holes of the coal body samples;
the hydraulic cylinder 28 applies pressure to the two semicircular cylinder walls 261, and the air pressure of the connecting air bag 262 is adjusted to fill the gaps so as to simulate the boundary confining pressure of the coal sample in the connecting air bag;
sequentially opening an air inlet 3 and an air door of an extraction opening 5 corresponding to one of the experiment box assemblies 2, closing the other experiment box assemblies 2, providing negative pressure for an extraction pipeline 6 by extraction analysis equipment 7 to extract coal bed gas of a corresponding coal sample, and simulating boundary coal bed gas by an external air source provided by an air inlet pipeline 4;
in the extraction process, as the pressure barrel 26 is of a porous ventilation structure, the pressure cavity 23 simulates the boundary of a coal seam, negative pressure is generated, so that pressure difference is generated between the pressure cavity 23 and the air distribution cavity 22, the resistance blade 271 generates rotating torque due to the pressure difference, when the resistance blade 271 rotates, damping is provided by the damping sensing device 29 through the movement of the adjusting ring 273, the damping can be recorded by the sensor, and different damping can be provided by replacing the damping sensing device 29 to simulate different boundary conditions;
the working conditions of extracting the coalbed methane under different pressures recorded by the damping sensing device 29 through the extracting analysis equipment 7 can analyze the extracting efficiency of the coalbed methane sample under the corresponding boundary conditions so as to provide guidance for the economic benefit of the coalbed methane extracting work;
after all extraction simulation experiments are completed, the air inlet pipeline 4 is disconnected from the air supply bottle and connected to the air, the air door and the exhaust equipment of the exhaust port 8 are opened, and after residual gas in the air distribution cavity 21 and the pressure cavity 23 is exhausted, the feeding door 10 is opened to take out a coal sample.
In another embodiment, the air doors of the air inlets 3 and the extraction openings 5 corresponding to the experiment box assemblies 2 are opened simultaneously, extraction simulation is performed, and the extraction efficiency of the multi-wellhead parallel coal bed gas extraction of the variable coal bed mining field can be analyzed.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The utility model provides a be used for coal bed gas negative pressure to take out and adopt analogue means, includes support (1), its characterized in that, support (1) is erect on the frame and is equipped with a plurality of experimental box subassemblies (2), can place the coal body sample in experimental box subassemblies (2), its below is air inlet (3), every air inlet (3) are connected to outside gas feed bottle through air inlet pipe (4), be in experimental box subassemblies (2) and take out and adopt mouth (5), be connected with in taking out and adopt mouth (5) and be able to insert in the coal body sample take out and adopt pipeline (6), take out and adopt pipeline (6) to be connected to take out and adopt analytical equipment (7), take out and adopt analytical equipment (7) can provide the negative pressure in taking out and adopting pipeline (6), the one side of experimental box subassemblies (2) is equipped with feed gate (10) that can shift the coal body sample;
an exhaust port (8) is further formed above the experiment box assembly (2), and the exhaust port (8) is connected into exhaust equipment through an exhaust pipeline (9);
the experimental box assembly (2) comprises a shell (21), the shell (21) is fixedly connected with the support (1), an air distribution cavity (22) and a pressure cavity (23) which are mutually sealed are respectively arranged at the bottom and the middle of the shell (21), an air inlet (3) is arranged below the air distribution cavity (22), an extraction opening (5) is arranged on the pressure cavity (23), the pressure cavity (23) is communicated with the air outlet (8), and the feeding door (10) is arranged on the side wall of the pressure cavity (23);
an air flow damping component (27) is arranged between the air distribution cavity (22) and the pressure cavity (23);
the airflow damping assembly (27) comprises resistance blades (271), wherein the resistance blades (271) are circumferentially distributed in circular grooves at the bottom of the pressure cavity (23), and are rotatably connected with the bottom of the pressure cavity (23) by taking the radial direction of the circumference as a rotating shaft, and each resistance blade (271) is mutually closed when rotating to the horizontal;
one end of the resistance vane (271) far away from the center of a circle penetrates through a circular groove at the bottom of the pressure cavity (23) to the side wall and is fixed with a rotary connecting rod (272) in the air distribution cavity (22), and the other end of each rotary connecting rod (272) is connected to an adjusting ring (273) in the air distribution cavity (22) together;
a plurality of sliding grooves (274) are formed in the adjusting ring (273) along the circumferential direction, and one end of the rotating connecting rod (272) is slidably connected into the sliding grooves (274);
connecting shafts (275) are symmetrically fixed on two sides of the adjusting ring (273), the connecting shafts (275) penetrate through the air distribution cavity (22) to the outside of the shell (21), and through grooves which can be used for the shell (21) to pass through soft materials in a sealing mode in a vertically sliding mode are formed in the shell (21);
the connecting shaft (275) is connected to a damping sensor (29) at one end outside the shell (21), the damping sensor (29) is detachably connected with the shell (21), and the damping sensor (29) can provide damping for the up-and-down movement of the adjusting ring (273) and can sense the pressure generated by the damping sensor.
2. The negative pressure extraction simulation device for the coal bed gas according to claim 1, wherein air doors are arranged in the air inlet (3), the extraction opening (5) and the air outlet (8) and can be controlled to be opened and closed.
3. A device for negative pressure extraction simulation of coalbed methane according to claim 1, characterized in that a guide rail (24) perpendicular to a feed gate (10) is fixed at the bottom of the pressure cavity (23) and above the airflow damping component (27), a slide seat (25) is slidably arranged in the guide rail (24), a pressure barrel (26) is arranged on the slide seat (25), the pressure barrel (26) can slide out of the feed gate (10) in the guide rail (24) so as to transfer a coal sample therein, and the extraction pipeline (6) can penetrate into the coal sample in the pressure barrel (26);
and the side wall of the pressure barrel (26) and the bottom of the sliding seat (25) are air-permeable porous plates.
4. A device for negative pressure extraction of coalbed methane according to claim 3, characterized in that the pressure barrel (26) comprises two semicircular walls (261), the semicircular walls (261) are slidably connected with the sliding seat (25), two interfaces of the semicircular walls (261) are connected through a connecting air bag (262), and the connecting air bag (262) is further connected to an external air pump for air pressure adjustment.
5. The device for negative pressure extraction simulation of coal bed gas according to claim 4, wherein each semicircular cylinder wall (261) is provided with a hydraulic cylinder (28) on the inner walls of two sides of the pressure cavity (23) corresponding to the concentric position of the extraction port (5), and the tail end of a piston rod of the hydraulic cylinder (28) is fixed with a fitting block (281) capable of fitting with the outer wall of the semicircular cylinder wall (261).
6. The device for negative pressure extraction simulation of coal bed gas according to claim 4, wherein pressure sensing patches are distributed on the inner wall of the semi-circular cylinder wall (261).
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| 负压下构造煤加卸载过程瓦斯渗透率变化研究;焦义;;煤炭工程(第09期);全文 * |
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