CN114059972A - 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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- CN114059972A CN114059972A CN202111404089.4A CN202111404089A CN114059972A CN 114059972 A CN114059972 A CN 114059972A CN 202111404089 A CN202111404089 A CN 202111404089A CN 114059972 A CN114059972 A CN 114059972A
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- extraction
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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
Abstract
The invention discloses a coal bed gas negative pressure extraction simulation device which comprises a support, wherein a plurality of experiment box assemblies are erected on the support, coal body samples can be placed in the experiment box assemblies, air inlets are formed below the experiment box assemblies, each air inlet is connected to an external air supply bottle through an air inlet pipeline, an extraction port is formed in each experiment box assembly, an extraction pipeline capable of being inserted into the coal body samples is connected into the extraction port, the extraction pipeline is connected into extraction analysis equipment, the extraction analysis equipment can provide negative pressure in the extraction pipeline, and a feed door capable of transferring the coal body samples is arranged on one surface of each experiment box assembly; an air outlet is also formed in the upper portion of the experiment box assembly and connected into an exhaust device through an exhaust pipeline. Compared with the prior art, the method can analyze the extraction efficiency of the coal body sample under the corresponding boundary condition so as to provide guidance for the economic benefit of the coal bed gas extraction work, and has the advantages of high efficiency, good safety and flexible variable adjustment.
Description
Technical Field
The invention relates to the technical field of coal bed gas exploitation experimental equipment, in particular to a coal bed gas negative pressure extraction simulation device.
Background
The coal bed gas is a gas resource associated with coal and symbiotic with the coal, refers to hydrocarbon gas stored in a coal bed, takes methane as a main component, and belongs to unconventional natural gas. The coal bed gas mainly adsorbs the surfaces of coal matrix particles, and part of the hydrocarbon gas is dissociated in coal pores or dissolved in coal bed water, is an associated mineral resource of coal, and is a clean and high-quality energy and chemical raw material which rises internationally in nearly twenty years. The coal bed gas can be subjected to negative pressure extraction by drilling on the ground and connecting extraction equipment, but because the physical properties of coal pore spaces, the content of the coal bed gas, the boundary conditions of the coal bed and the like of different coal beds are different, the economic benefit of extraction needs to be analyzed through simulation experiment research before extraction. The existing coal bed gas extraction simulation experiment device utilizes a closed container to perform simulated extraction on a coal body sample, and needs to be repeatedly assembled and disassembled when a plurality of groups of experiments are performed, so that the time consumption is long, gas leakage is easily caused, the safety is damaged, the confining pressure and boundary conditions of the coal body sample cannot be simulated, the accuracy of the experiment is low, and the influence caused by the change of the experiment is difficult to study.
Therefore, it is necessary to provide a simulation device for coal bed methane negative pressure extraction to solve the problems in the background art.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: the device for simulating the negative pressure extraction of the coal bed gas comprises a support, wherein a plurality of experimental box assemblies are erected on the support, coal body samples can be placed in the experimental box assemblies, air inlets are formed in the lower portions of the experimental box assemblies, each air inlet is connected to an external air supply bottle through an air inlet pipeline, an extraction port is formed in each experimental box assembly, an extraction pipeline capable of being inserted into the coal body samples is connected into the extraction port, the extraction pipeline is connected into extraction analysis equipment, the extraction analysis equipment can provide negative pressure in the extraction pipeline, and a feed door capable of transferring the coal body samples is arranged on one surface of each experimental box assembly;
an air outlet is also formed in the upper portion of the experiment box assembly and connected into an exhaust device through an exhaust pipeline.
Preferably, the air inlet, the extraction port and the air outlet are respectively provided with an air door, and the opening and the closing of the air doors can be controlled.
Further, preferably, the experiment box assembly comprises a housing, the housing is fixedly connected with a support, the bottom and the middle of the housing are respectively provided with a gas distribution cavity and a pressure cavity which are sealed mutually, a gas inlet is arranged below the gas distribution cavity, a gas extraction opening is arranged above the pressure cavity, the pressure cavity is communicated with a gas outlet, and the feeding door is arranged on the side wall of the pressure cavity;
and an airflow damping component is arranged between the air distribution cavity and the pressure cavity.
Preferably, a guide rail perpendicular to the feeding door is fixed at the bottom of the pressure cavity and above the airflow damping assembly, a sliding seat is slidably arranged in the guide rail, a pressure barrel is arranged on the sliding seat, the pressure barrel can slide in the guide rail to the outside of the feeding door to transfer a coal sample in the pressure barrel, and the extraction pipeline can penetrate through the coal sample in the pressure barrel;
and the side wall of the pressure barrel and the bottom of the sliding seat are provided with ventilating porous plates.
Further, preferably, the pressure barrel comprises two semi-cylindrical walls, the semi-cylindrical walls are slidably connected with the sliding seat, two interfaces of the semi-cylindrical 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.
Preferably, hydraulic cylinders are respectively arranged on the inner walls of two sides of the pressure cavity corresponding to each semi-cylindrical wall at the position concentric with the extraction opening, and a fitting block capable of being fitted with the outer wall of the semi-cylindrical wall is fixed at the tail end of a piston rod of each hydraulic cylinder.
Further, preferably, pressure sensing patches are distributed on the inner wall of the semi-cylindrical wall.
Further, preferably, the airflow damping assembly comprises resistance blades, the resistance blades are circumferentially 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 sealed when rotating to the horizontal direction.
Furthermore, preferably, one end of the resistance blade, which is far away from the circle center, penetrates through a circular groove at the bottom of the pressure cavity to the side wall and enters the gas distribution cavity, a rotating connecting rod is fixed at the end, and the other end of each rotating connecting rod is connected to an adjusting ring in the gas 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 connected to the sliding grooves in a sliding mode.
Preferably, connecting shafts are symmetrically fixed on two sides of the adjusting ring, penetrate through the air distribution cavity and reach the outside of the shell, and the shell is provided with a through groove which can be sealed by a soft material in a vertically sliding manner;
one end of the connecting shaft outside the shell is connected into a damping sensing device, 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 two semicircular cylinder walls are pressurized by the hydraulic cylinder, and the gap between the two semicircular cylinder walls is filled by adjusting the air pressure of the connecting air bag, so that the boundary confining pressure of the coal sample in the hydraulic cylinder can be simulated.
According to the invention, different coal body samples with extraction holes are put into the pressure barrel of each experiment box assembly, the air inlet and the extraction port air door corresponding to one experiment box assembly are sequentially opened, multiple simulation experiments can be carried out 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 parallel experiments can be carried out to analyze the extraction efficiency of the multi-wellhead parallel coal bed gas extraction in the coal bed field.
According to the invention, as the pressure barrel is of a porous ventilation structure, the pressure cavity simulates the boundary of a 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 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 replacing the damping sensing device so as to simulate different boundary conditions; the coal bed gas extraction efficiency of the coal sample under the corresponding boundary condition can be analyzed through the working condition that the damping and extraction analysis equipment recorded by the damping sensing device extracts the coal bed gas under different pressures, so that guidance is provided for the economic benefit of the coal bed gas extraction work.
Drawings
FIG. 1 is a schematic structural diagram of a coal bed gas negative pressure extraction simulation device;
FIG. 2 is a schematic view of the construction of the laboratory box assembly;
FIG. 3 is a schematic structural view of a pressure barrel;
FIG. 4 is a schematic view of the structure of the airflow damping assembly;
in the figure: 1. a support; 2. an experimental box assembly; 3. an air inlet; 4. an air intake duct; 5. an extraction port; 6. extracting a pipeline; 7. extracting and analyzing equipment; 8. an exhaust port; 9. an exhaust duct; 10. a feed gate; 21. a housing; 22. a gas distribution cavity; 23. a pressure chamber; 24. a guide rail; 25. a slide base; 26. a pressure barrel; 27. an airflow damping assembly; 28. a hydraulic cylinder; 281. fitting blocks; 29. a damping sensing device; 261. a semi-cylindrical wall; 262. connecting the air bag; 271. a drag blade; 272. rotating the connecting rod; 273. an adjustment ring; 274. a chute; 275. and (7) connecting the shafts.
Detailed Description
Referring to fig. 1, in the embodiment of the invention, a coal bed gas negative pressure extraction simulation device comprises a support 1, wherein a plurality of experiment box assemblies 2 are erected on the support 1, coal samples can be placed in the experiment box assemblies 2, air inlets 3 are formed below the experiment box assemblies 2, each air inlet 3 is connected to an external air supply bottle through an air inlet pipeline 4, an extraction port 5 is formed in each experiment box assembly 2, an extraction pipeline 6 capable of being inserted into the coal samples is connected to the extraction port 5, the extraction pipeline 6 is connected to extraction analysis equipment 7, the extraction analysis equipment 7 can provide negative pressure in the extraction pipeline 6, and a feed gate 10 capable of transferring the coal samples is arranged on one surface of each experiment box assembly 2;
an air outlet 8 is formed above the experiment box component 2, and the air outlet 8 is connected to an exhaust device through an exhaust pipeline 9;
in this embodiment, the air inlets 3, the extraction ports 5, and the exhaust ports 8 are all provided with air doors, which can be controlled to open and close.
Referring to fig. 2, in this embodiment, the experiment box assembly 2 includes a housing 21, the housing 21 is fixedly connected to the support 1, the bottom and the middle of the housing 21 are respectively a gas distribution chamber 22 and a pressure chamber 23 that are sealed with each other, a gas inlet 3 is arranged below the gas distribution chamber 22, a gas extraction opening 5 is arranged above the pressure chamber 23, the pressure chamber 23 is communicated with a gas outlet 8, and the feed gate 10 is arranged on a side wall of the pressure chamber 23;
an air flow damping assembly 27 is arranged between the air distribution chamber 22 and the pressure chamber 23.
In this embodiment, a guide rail 24 perpendicular to the feeding gate 10 is fixed at a position above the airflow damping assembly 27 and at the bottom of the pressure chamber 23, a sliding seat 25 is slidably arranged in the guide rail 24, a pressure barrel 26 is arranged on the sliding seat 25, the pressure barrel 26 can slide in the guide rail 24 to the outside of the feeding gate 10 to transfer a coal sample therein, and the extraction pipeline 6 can penetrate through 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 provided with air-permeable porous plates;
that is, when the extraction pipeline 6 performs negative pressure extraction on the coal sample in the pressure barrel 26, the coal sample can penetrate through the coal sample and the pressure barrel 26 to generate negative pressure in the pressure cavity 23, and negative pressures with different sizes are generated in the pressure cavity 23 due to different permeability of the coal sample to airflow, 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 to the slide carriage 25, two ports of the semi-cylindrical walls 261 are connected by a connection airbag 262, and the connection airbag 262 is further connected to an external air pump for air pressure adjustment.
In this embodiment, the inner walls of the two sides of the pressure cavity 23, which correspond to each semi-cylindrical wall 261 at a position concentric with the extraction opening 5, are respectively provided with a hydraulic cylinder 28, and the tail end of the piston rod of each hydraulic cylinder 28 is fixed with a fitting block 281 capable of fitting with the outer wall of the semi-cylindrical wall 261;
that is, when the pressure bucket 26 is moved to a position concentric with the extraction port 5, it is possible to apply pressure to its two semi-cylindrical walls 261 by the hydraulic cylinder 28 and fill its gap by adjusting the air pressure of the connecting bladder 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-cylindrical wall 261.
In this embodiment, the airflow damping assembly 27 includes resistance blades 271, the resistance blades 271 are circumferentially distributed in a circular groove at the bottom of the pressure chamber 23, and are rotatably connected to the bottom of the pressure chamber 23 by using the radial direction of the circumference as a rotating shaft, and each of the resistance blades 271 is sealed when rotating to the horizontal direction.
In this embodiment, one end of the resistance vane 271, which is 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 is fixed in the air distribution chamber 22, and the other end of each of the rotating connecting rods 272 is connected to the 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 air distribution chamber 22 and the pressure chamber 23, the resistance vane 271 rotates and moves the adjusting 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 chamber 22 to the outside of the housing 21, and the housing 21 is provided with a through groove which can be sealed by a soft material in a vertically sliding manner;
the connecting shaft 275 is connected to a damping sensing device 29 at one end outside the shell 21, the damping sensing device 29 is detachably connected with the shell 21, and the damping sensing device 29 can provide damping for the up-and-down movement of the adjusting ring 273 and can sense the pressure generated by the adjusting ring;
that is, the rotation of the resistance vanes 271 is damped by the damping sensing device 29 by movement of the adjuster ring 273 and this damping can be registered by the sensor.
During specific implementation, different coal body samples subjected to extraction hole drilling are placed in the pressure barrel 26 of each experimental box assembly 2 through the feeding door 10, the coal body samples are moved to a position concentric with the extraction opening 5 in the guide rail 24, and the extraction pipeline 6 is placed in the extraction holes of the coal body samples;
the two semi-cylindrical walls 261 of the coal body are pressurized through the hydraulic cylinder 28, and the gap is filled by adjusting the air pressure of the connecting air bag 262 so as to simulate the boundary confining pressure of the coal body sample in the coal body;
sequentially opening air doors of an air inlet 3 and an extraction opening 5 corresponding to one experiment box assembly 2, closing other experiment box assemblies 2, providing negative pressure for an extraction pipeline 6 by extraction analysis equipment 7 to extract coal bed gas from corresponding coal body samples, and simulating boundary coal bed gas by an external gas source provided by an air inlet pipeline 4;
in the extraction process, because the pressure barrel 26 is of a porous ventilation structure, the pressure cavity 23 simulates the boundary of a coal seam and also generates negative pressure, so that pressure difference is generated between the pressure cavity 23 and the gas distribution cavity 22, the resistance blades 271 generate rotating torque due to the pressure difference, when the resistance blades 271 rotate, damping is provided by the damping sensing device 29 through the movement of the adjusting ring 273, the damping can be recorded by a sensor, and different damping can be provided by replacing the damping sensing device 29 so as to simulate different boundary conditions;
the extraction efficiency of the coal body sample under the corresponding boundary condition can be analyzed through the working condition that the damping and extraction analysis equipment 7 extracts the coal bed gas under different pressures recorded by the damping sensing device 29, so as to provide guidance for the economic benefit of the coal bed gas extraction work;
after all the extraction simulation experiments are finished, the air inlet pipeline 4 is disconnected from the air supply bottle and is connected to the air, the air door and the exhaust equipment of the exhaust port 8 are opened, residual gas in the air distribution cavity 21 and the pressure cavity 23 is exhausted, and then 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 ports 5 corresponding to the plurality of experiment box assemblies 2 are opened simultaneously to perform extraction simulation, so that the extraction efficiency of extraction of the multi-well parallel coal bed gas in the coal bed field can be analyzed and changed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. The device for simulating the negative pressure extraction of the coal bed gas comprises a support (1) and is characterized in that a plurality of experiment box assemblies (2) are erected on the support (1), coal samples can be placed in the experiment box assemblies (2), air inlets (3) are 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 opening (5) is formed in each experiment box assembly (2), an extraction pipeline (6) capable of being inserted into the coal samples is connected into each extraction opening (5), each extraction pipeline (6) is connected into extraction analysis equipment (7), the extraction analysis equipment (7) can provide negative pressure in each extraction pipeline (6), and a feed door (10) capable of transferring the coal samples is arranged on one surface of each experiment box assembly (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).
2. The device for simulating the negative pressure extraction of 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. The device for simulating the negative pressure extraction of the coal bed gas according to claim 1, wherein the experiment box assembly (2) comprises a housing (21), the housing (21) is fixedly connected with the support (1), the bottom and the middle of the housing (21) are respectively provided with an air distribution cavity (22) and a pressure cavity (23) which are sealed mutually, 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 an exhaust port (8), and the feeding door (10) is arranged on the side wall of the pressure cavity (23);
an air flow damping assembly (27) is arranged between the air distribution cavity (22) and the pressure cavity (23).
4. The device for simulating the negative pressure extraction of the coal bed gas according to claim 3, wherein a guide rail (24) perpendicular to the feed door (10) is fixed at a position at the bottom of the pressure cavity (23) and above the airflow damping assembly (27), a sliding seat (25) is slidably arranged in the guide rail (24), a pressure barrel (26) is arranged on the sliding seat (25), the pressure barrel (26) can slide in the guide rail (24) to the outside of the feed door (10) 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 provided with air-permeable porous plates.
5. The coal bed gas negative pressure extraction simulation device according to claim 4, wherein the pressure barrel (26) comprises two semi-cylindrical walls (261), the semi-cylindrical walls (261) are slidably connected with the sliding base (25), two interfaces of the semi-cylindrical 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 regulation.
6. The coal bed gas negative pressure extraction simulation device according to claim 5, characterized in that hydraulic cylinders (28) are respectively arranged on the inner walls of two sides of the corresponding pressure cavity (23) of each semi-cylindrical wall (261) at a position concentric with the extraction opening (5), and a fitting block (281) capable of fitting with the outer wall of the semi-cylindrical wall (261) is fixed at the tail end of a piston rod of each hydraulic cylinder (28).
7. The device for simulating the negative pressure extraction of the coal bed gas as claimed in claim 5, wherein pressure sensing patches are distributed on the inner wall of the semi-cylindrical wall (261).
8. The coal bed gas negative pressure extraction simulation device according to claim 3, wherein the airflow damping assembly (27) comprises resistance blades (271), the circumferences of the resistance blades (271) are distributed in circular grooves at the bottom of the pressure cavity (23), the resistance blades 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 sealed when rotating to the horizontal.
9. The coal bed gas negative pressure extraction simulation device according to claim 8, wherein one end of the resistance blade (271), which is far away from the center of the circle, penetrates through a circular groove at the bottom of the pressure cavity (23) to the side wall and is fixed in the gas distribution cavity (22), and the other end of each rotation connecting rod (272) is connected to an adjusting ring (273) in the gas 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 connected to the sliding grooves (274) in a sliding mode.
10. The coal bed gas negative pressure extraction simulation device according to claim 9, wherein connecting shafts (275) are symmetrically fixed to two sides of the adjusting ring (273), the connecting shafts (275) penetrate through the gas distribution cavity (22) to the outside of the casing (21), and the casing (21) is provided with a through groove which can be sealed by a soft material in a vertically sliding manner;
the connecting shaft (275) is connected to a damping sensing device (29) at one end outside the shell (21), the damping sensing device (29) is detachably connected with the shell (21), and the damping sensing device (29) can provide damping for the up-and-down movement of the adjusting ring (273) and can sense the pressure generated by the adjusting ring.
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