CN114961652B - Device and method for improving yield of low-order reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air with propping agent - Google Patents
Device and method for improving yield of low-order reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air with propping agent Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 238000002156 mixing Methods 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000007787 solid Substances 0.000 claims abstract description 80
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 48
- 239000003245 coal Substances 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 229910001570 bauxite Inorganic materials 0.000 claims 1
- 238000003795 desorption Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 60
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention provides a device and a method for improving the yield of low-order reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air and propping agent, wherein the device comprises a gas supply tank, a gas supercharging device, a gas-solid mixing device and a gas-solid secondary mixing device; the exhaust end of the gas supply tank is connected with a second gas inlet of the gas-solid secondary mixing device through a first pipeline and a second pipeline respectively, the gas inlet of the gas pressurizing device is connected with the gas inlet of the gas-solid mixing device through a third pipeline, and the gas outlet of the gas-solid mixing device is connected with the first gas inlet of the gas-solid secondary mixing device; the gas outlet of the gas-solid secondary mixing device is connected with the wellhead of the heat injection well. The invention can realize continuous heating fracturing of the coal bed, is convenient for efficient construction and exploitation operation, can improve the desorption rate of the coal bed gas, thereby generating a large number of artificial cracks and further can improve the yield of the low-rank coal bed gas.
Description
Technical Field
The invention relates to a device and a method for improving the yield of low-order reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air and propping agent, and belongs to the technical field of coalbed methane exploitation.
Background
Coal bed gas is a non-conventional natural gas associated with coal, and the main component of the coal bed gas is methane, so that the coal bed gas is an important clean energy source and is also a high-quality chemical raw material. Low rank coalbed methane is the main subject of world coalbed methane development. Currently, countries that successfully realize the large-scale exploitation and utilization of coalbed methane in the world have only the united states, canada, australia and china. The vast majority of coalbed methane production in the united states, canada and australia is from low-rank coalbed methane, while the vast majority of coalbed methane production in China is from medium-rank and high-rank coalbed methane from the Shanxi basin and the eastern edge of the jaw-duosi basin.
However, the development effect of low-rank coalbed methane in China is not ideal, and the main reasons are that the geological structure of a reservoir area is complex, the exploitation and utilization difficulty is high, the low-rank coalification degree is low, the pores are relatively more, the matrix is loose, the permeability of a reservoir is extremely low, and the yield of the coalbed methane is difficult to effectively improve.
At present, various extraction methods of coal bed gas are adopted, coal bed gas is extracted by heat injection, the effective measure for improving the permeability of a low-rank reservoir is widely accepted, a plurality of scholars at home and abroad explore the influence rule of temperature on the desorption rate of gas in a coal body, and experimental results show that the desorption rate of the coal bed gas in the coal body can be increased by improving the temperature. However, the traditional method for heating the coal reservoir by using the electric heating coal reservoir and the high-temperature superheated steam has the defects of high resource consumption, high cost and low economic effect, and is difficult to realize industrialization and large-scale implementation and application.
Therefore, providing a novel gas-solid mixing device, a device and a method for improving the yield of low-rank reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air and propping agent have become a technical problem to be solved in the field.
Disclosure of Invention
In order to solve the above-mentioned drawbacks and disadvantages, an object of the present invention is to provide a gas-solid mixing device.
It is yet another object of the present invention to provide an apparatus for increasing the yield of low-rank reservoir coalbed methane.
It is yet another object of the present invention to provide a method for increasing the yield of low-rank reservoir coalbed methane.
To achieve the above object, in one aspect, the present invention provides a gas-solid mixing device, wherein the gas-solid mixing device includes: the device comprises a shell and a storage bin, wherein one end of the shell is provided with an air inlet, the other end of the shell is provided with an air outlet, and the side wall of the shell is provided with a feed inlet; a piston and a rotary cavity are arranged in the shell, the piston is provided with a concave part, and a plurality of discharge holes are distributed on the surface of the rotary cavity;
a linear motor is arranged in the shell and close to the air inlet side, the linear motor is connected with one end of the piston so that the piston can horizontally reciprocate along the horizontal axis direction of the shell, a discharge pipeline of the storage bin enters the shell through the feed inlet, propping agent contained in the storage bin is sent to a concave part of the piston, and the propping agent is sent into the rotary cavity through the opening end of the rotary cavity by the horizontal reciprocation of the piston;
the motor rotor is characterized in that a first bearing seat and a second bearing seat are further arranged in the shell respectively, a first bearing and a second bearing are arranged at the centers of the first bearing seat and the second bearing seat respectively, the closed end of the rotating cavity is connected with the second bearing, the open end of the rotating cavity penetrates through the first bearing to be connected with the motor rotor, and a motor stator is sleeved outside the motor rotor, so that the rotating cavity can rotate under the drive of the first bearing and the second bearing after the motor rotor is electrified.
As a specific embodiment of the gas-solid mixing device according to the present invention, the rotating cavity is a conical cavity.
As a specific embodiment of the gas-solid mixing device, the piston is provided with the sealing rubber ring so as to prevent gas from flowing back into the bin in the reciprocating motion process of the piston.
As a specific embodiment of the gas-solid mixing device according to the present invention, the open end of the rotating chamber passes through the first bearing and is connected to the motor rotor through a bearing ring.
In a specific embodiment of the gas-solid mixing device according to the present invention, the bearing pressing ring is screwed with the open end of the rotating cavity, and the motor rotor is fixed on the rotating cavity by screwing; the motor stator is arranged on one side of the first bearing seat (namely, one side close to the air inlet of the shell) and can be fastened by adopting a screw, and when the motor stator is electrified, the motor rotor rotates so as to drive the rotating cavity to rotate; the other side of the first bearing seat (i.e. the side close to the air outlet of the housing) is provided with a first bearing to ensure that the rotating chamber rotates smoothly.
In another aspect, the present invention also provides a device for increasing the yield of low-rank reservoir coalbed methane, where the device for increasing the yield of low-rank reservoir coalbed methane includes:
the device comprises a gas supply tank, a gas pressurizing device, the gas-solid mixing device and a gas-solid secondary mixing device;
the exhaust end of the air supply tank is connected with the second air inlet of the gas-solid secondary mixing device and the air inlet of the gas pressurizing device through a first pipeline and a second pipeline respectively, the air outlet of the gas pressurizing device is connected with the air inlet of the gas-solid mixing device through a third pipeline, and the air outlet of the gas-solid mixing device is connected with the first air inlet of the gas-solid secondary mixing device; and an air outlet of the gas-solid secondary mixing device is connected with a wellhead of the heat injection well.
As an embodiment of the device for improving the yield of low-rank reservoir coalbed methane according to the invention, the device further comprises a display (9).
The device for improving the yield of the low-rank reservoir coalbed methane comprises a shell and a junction box, wherein the top end of the shell is closed, the bottom end of the shell is fixedly connected with the junction box, a linear motor is arranged on the junction box at the inner bottom of the shell, a piston cavity is further arranged in the shell, and an air outlet and an air inlet are respectively formed in the upper end, the middle and the lower end of the side wall of the shell and the side wall of the piston cavity so as to enable the piston cavity to be communicated with the outside; the piston cavity is internally provided with a piston, the piston can reciprocate up and down in the piston cavity, the bottom of the piston is connected with the linear motor, the top of the piston cavity is fixedly provided with a pressure-bearing spring, and the bottom of the pressure-bearing spring is connected with a sliding block; when the pressure-bearing spring is in a natural state, the sliding block can seal the air outlet; when the pressure-bearing spring is in a compressed state, the sliding block moves along the shrinkage direction of the pressure-bearing spring, so that the air outlet is communicated;
the piston can control the air inlet to be closed or conducted through up-and-down reciprocating motion, and pressurizes the air when moving upwards, and the pressurized air can push the sliding block to enable the pressure-bearing spring to shrink, so that the air outlet is controlled to be conducted or closed.
As a specific embodiment of the device for improving the yield of low-rank reservoir coalbed methane, the bottom of the piston cavity is provided with a linear bearing for assisting the piston to reciprocate up and down.
In a specific embodiment of the invention, the linear bearing is pressed at the bottom of the piston cavity in an interference fit manner, and the inner circular surface of the linear bearing is contacted with the bottom outer circle of the piston so as to ensure that the piston stably reciprocates.
As a specific embodiment of the device for improving the yield of low-rank reservoir coalbed methane, the piston and the sliding block are respectively provided with a plurality of groups of sealing rubber rings.
As an embodiment of the apparatus for improving the yield of low-rank reservoir coalbed methane according to the invention, the gas-solid secondary mixing apparatus comprises: the device comprises a shell and a rotating shaft arranged in the shell, wherein a plurality of groups of rotating blades are arranged on the rotating shaft, the upper end of the side wall of the shell is provided with a first air inlet, a second air inlet and an air outlet respectively, and the second air inlet is provided with a one-way valve;
the inner bottom of the shell is provided with a bearing support, the center of the bearing support is provided with a lower end bearing, the inner top of the shell is provided with a motor stator and a motor rotor, the motor stator is sleeved outside the motor rotor, the bottom end of the rotating shaft is connected with the lower end bearing, and the top end of the rotating shaft is connected with a counter bore in the center of the motor rotor through a pressing ring.
In a specific embodiment of the invention, a counter bore is arranged in the center of the motor rotor, the outer edge of the top end of the rotating shaft is in a threaded structure, the pressing ring is connected with the threaded structure of the outer edge of the top end of the rotating shaft, and the top end of the rotating shaft is fixed in the counter bore in the center of the motor rotor, so that the connection between the motor rotor and the rotating shaft is realized.
As a specific embodiment of the device for improving the yield of low-rank reservoir coalbed methane according to the invention, a lower end bearing pressing ring is installed at the bottom of the lower end bearing and used for fixing the lower end bearing.
As a specific embodiment of the device for improving the yield of low-rank reservoir coalbed methane, the top of the motor stator is provided with a stator pressing ring.
The device for improving the yield of the low-order reservoir coalbed methane provided by the invention has the advantages that the distribution of each component device and the layout of the used connecting pipelines are attractive and reasonable, the space utilization rate of an experiment site is effectively improved, and the device is convenient to overhaul and maintain.
In yet another aspect, the present invention also provides a method for increasing the yield of low-rank reservoir coalbed methane, wherein the method uses the device for increasing the yield of low-rank reservoir coalbed methane described above, and the method comprises the following steps:
(1) The high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters the air pressurizing device to further increase the pressure of the high-temperature high-pressure hot air;
(2) The high-temperature high-pressure hot air after pressurization in the step (1) enters a gas-solid mixing device and is uniformly mixed with the propping agent (primary mixing);
(3) The high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank and the high-temperature high-pressure hot air mixed with the propping agent obtained in the step (2) enter a gas-solid secondary mixing device, and the high-temperature high-pressure hot air and the propping agent are mixed more fully and uniformly (secondary mixing) in the gas-solid secondary mixing device;
(4) And (3) injecting the high-temperature and high-pressure hot air mixed with the propping agent obtained in the step (3) into an injection well, and then, exploiting the low-order reservoir coalbed methane.
In a specific embodiment of the method of the present invention, in the low-level reservoir coalbed methane exploitation process, the heat injection well and the well head of the exploitation well form a well pattern on the ground, and four exploitation wells are uniformly distributed around one heat injection well in the well pattern. The arrangement and the operation are beneficial to large-scale exploitation and utilization of the coal bed gas and improve the economic benefit.
As a specific embodiment of the above method of the present invention, the step (2) includes the following specific steps:
the high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters a piston cavity through an air inlet of the air pressurizing device, the linear motor is electrified to push the piston to move upwards, the air inlet is closed at the moment, the piston cavity is closed, the air volume is reduced due to the movement of the piston, the pressure is increased, when the pressure is increased to a specific value, the sliding block is stressed to extrude the pressure-bearing spring to shrink, the sliding block moves along the shrinking direction, the air outlet is communicated, and the air flow after the pressure increase flows out through the air outlet; the pressure in the piston cavity is reduced after the gas flows out, the pressure-bearing spring pushes the sliding block to move downwards, the gas outlet is closed, the linear motor drives the piston to move downwards, the gas inlet is communicated, and the gas reenters the piston cavity to complete a pressurizing process.
As a specific embodiment of the above method of the present invention, the step (3) includes the following specific steps:
after the high-temperature high-pressure hot air mixed with the propping agent obtained in the step (2) enters the gas-solid secondary mixing device, the motor rotor is electrified, a plurality of groups of rotating blades arranged on the rotating shaft rotate at a high speed under the drive of the motor rotor, an upper end bearing and a lower end bearing, the high-temperature high-pressure hot air mixed with the propping agent is stirred again under the action of the rotating blades and is fully mixed with the high-temperature high-pressure hot air gas entering through a second air inlet of the gas-solid secondary mixing device, and meanwhile, the air pressure in the shell of the gas-solid secondary mixing device is increased, so that the gas-solid air mixed fully secondarily enters the coal seam through the air outlet.
As a specific embodiment of the above method of the present invention, wherein the proppant comprises one or a combination of several of quartz sand, spherical ceramic sand and sintered alumina.
The pressure and the temperature of the high-temperature and high-pressure hot air used in the invention are not particularly required, and the pressure, the temperature and the like of the high-temperature and high-pressure hot air after pressurization in the step (1) are reasonably set according to the actual operation needs of the site, such as the specific geological conditions (including depth, crack development conditions and the like) to be mined, by a person skilled in the art, so long as the purpose of the invention can be realized.
In addition, the invention does not specifically require the primary mixing time in the step (2) and the secondary mixing time in the step (3), and the mixing time can be reasonably set by a person skilled in the art according to the actual operation requirement on site, so long as the adoption of the primary mixing and secondary mixing alternative mixing mode for fully and uniformly mixing the high-temperature high-pressure hot air and the propping agent is ensured.
The device and the method for improving the yield of the low-order reservoir coalbed methane are based on centrifugal mixing of high-temperature and high-pressure hot air and propping agents, and enable the high-temperature and high-pressure hot air and propping agents to be evenly mixed and then to be injected into a heat injection well together through the air outlet of a gas-solid secondary mixing device. The adsorption capacity of the coal reservoir is reduced while the temperature of the coal bed is raised, and the desorption of methane molecules is promoted, so that the yield of low-rank coal bed gas is improved. Meanwhile, the propping agent is filled in the rock stratum cracks, and plays a role in supporting the cracks not to be closed due to stress release, so that high diversion capacity is maintained, oil gas is unblocked, and the yield is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a device for improving the yield of low-rank reservoir coalbed methane by centrifugally mixing high-temperature and high-pressure hot air with a propping agent according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an arrangement of well patterns suitable for the device provided in the embodiment of the invention.
Fig. 3 is a schematic diagram of a gas pressurizing device according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a gas-solid mixing apparatus used in the embodiment of the present invention.
Fig. 5 is a schematic view (enlarged cross-sectional view) of a gas-solid secondary mixing device used in the embodiment of the present invention.
The main reference numerals illustrate:
fig. 1: 1. the device comprises a gas supply tank, 2, a first pipeline, 3, a second pipeline, 4, a gas pressurizing device, 5, a third pipeline, 6, a gas-solid mixing device, 7, a gas-solid secondary mixing device, 8, a heat injection well, 9 and a display.
Fig. 2: 8. and a heat injection well, 10, a production well.
Fig. 3: 4. the device comprises a gas pressurizing device 11, a junction box 12, a linear motor 13, a piston 14, sealing rubber 15, an air inlet 16, an air outlet 17, a linear bearing 18, a pressure-bearing spring 19, a sliding block 47 and a piston cavity.
Fig. 4: 6. the gas-solid mixing device comprises a gas-solid mixing device 20, a gas inlet 21, a linear motor 22, a piston 23, a sealing rubber ring 24, a stock bin 25, a bearing pressing ring 26, a motor rotor 27, a motor stator 28, a first bearing seat 29, a first bearing 30, a rotating cavity 31, a discharge hole 32, a second bearing 33, a second bearing seat 34 and a gas outlet.
Fig. 5: 7. the gas-solid secondary mixing device comprises a gas-solid secondary mixing device 35, a first gas inlet 36, rotating blades 37, a rotating shaft 38, a lower end bearing 39, a lower end bearing pressing ring 40, a motor stator 41 and a motor rotor; 42. the stator clamping ring 43, the clamping ring 44, the one-way valve 45, the second air inlet 46 and the air outlet.
Detailed Description
In order to make the technical features, objects and advantageous effects of the present invention more clearly understood, the technical aspects of the present invention will now be described in detail with reference to the following specific examples, but should not be construed as limiting the scope of the present invention.
It should be noted that the term "comprising" in the description of the invention and the claims and any variations thereof in the above-described figures is intended to cover a non-exclusive inclusion, such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "inner", "outer", "middle", "top" and "bottom", etc. indicate an orientation or positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "disposed," "connected," and "connected" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
The embodiment provides a gas-solid mixing device, the structure of which is shown in fig. 4, and as can be seen from fig. 4, the gas-solid mixing device includes: the device comprises a shell and a stock bin 24, wherein an air inlet 20 is formed in one end of the shell, an air outlet 34 is formed in the other end of the shell, and a feed inlet is formed in the side wall of the shell; a piston 22 and a rotary cavity 30 are arranged in the shell, the piston 22 is provided with a concave part, and a plurality of discharge holes 31 are distributed on the surface of the rotary cavity 30;
a linear motor 21 is arranged in the shell and close to the air inlet 20, the linear motor 21 is connected with one end of the piston 22 so that the piston 22 can horizontally reciprocate along the horizontal axis direction of the shell, a discharge pipeline of the storage bin 24 enters the shell through the feed inlet and conveys propping agent contained in the storage bin 24 to a concave position of the piston 20, and then the propping agent is conveyed into the rotating cavity 30 through an opening end of the rotating cavity 30 by horizontally reciprocating movement of the piston 20;
the motor rotor 26 is also provided with a first bearing seat 28 and a second bearing seat 33 in the shell, a first bearing 29 and a second bearing 32 are respectively arranged at the centers of the first bearing seat 28 and the second bearing seat 33, the closed end of the rotating cavity 30 is connected with the second bearing 32, the open end of the rotating cavity 30 penetrates through the first bearing 29 to be connected with the motor rotor 26, and the motor rotor 26 is sleeved with a motor stator 27, so that after the motor rotor 26 is electrified, the rotating cavity 30 can rotate under the drive of the first bearing 29 and the second bearing 32.
In this embodiment, the rotating chamber 30 is a conical chamber.
In this embodiment, a sealing rubber ring 23 is disposed on the piston 22 to prevent the gas from flowing back into the bin 24 during the reciprocating motion of the piston 22.
In this embodiment, the open end of the rotating chamber 30 passes through the first bearing 29 and is connected to the motor rotor 26 through the bearing pressing ring 25;
specifically, the bearing pressing ring 25 is screwed with the open end of the rotating chamber 30, and the motor rotor 26 is fixed on the rotating chamber 30 by screwing in; the motor stator 27 is mounted on one side of the first bearing seat 28 (i.e. the side close to the air inlet of the housing), and can be fastened by using screws, and when the motor is powered on, the motor rotor 26 rotates, so as to drive the rotating cavity 30 to rotate; the other side of the first bearing housing 28, i.e. the side close to the housing air outlet, is provided with a first bearing 29 to ensure a smooth rotation of the rotating chamber 30.
Example 2
The embodiment provides a device for improving the yield of low-rank reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air and propping agent, the structural schematic diagram of the device is shown in fig. 1, and as can be seen from fig. 1, the device for improving the yield of low-rank reservoir coalbed methane comprises:
a gas supply tank 1, a gas pressurizing device 4, a gas-solid mixing device 6 and a gas-solid secondary mixing device 7 provided in example 1;
the exhaust end of the gas supply tank 1 is connected with the gas inlet 15 of the gas pressurizing device 4 through a second pipeline 3, and the exhaust end of the gas supply tank 1 is also connected with the second gas inlet 45 of the gas-solid secondary mixing device 7 through a first pipeline 2;
the gas outlet 16 of the gas pressurizing device 4 is connected with the gas inlet 20 of the gas-solid mixing device 6 through a third pipeline 5, and the gas outlet 34 of the gas-solid mixing device 6 is connected with the first gas inlet 35 of the gas-solid secondary mixing device 7; the gas outlet 46 of the gas-solid secondary mixing device 7 is connected with the wellhead of the heat injection well 8.
In this embodiment the device further comprises a display 9.
In this embodiment, the schematic structural diagram of the gas pressurizing device 4 is shown in fig. 3, and as can be seen from fig. 3, the gas pressurizing device 4 includes a housing and a junction box 11, the top end of the housing is closed, the bottom end of the housing is fixedly connected with the junction box 11, a linear motor 12 is disposed on the junction box 11 at the bottom of the housing, a piston cavity 47 is further disposed in the housing, and the upper ends and the middle lower ends of the side walls of the housing and the piston cavity 47 are respectively provided with an air outlet 16 and an air inlet 15, so that the piston cavity 47 is communicated with the outside; a piston 13 is arranged in the piston cavity 47, the piston 13 can reciprocate up and down in the piston cavity 47, the bottom of the piston 13 is connected with the linear motor 12, a pressure-bearing spring 18 is fixedly arranged at the top of the piston cavity 47, and a sliding block 19 is connected to the bottom of the pressure-bearing spring 18; when the pressure-bearing spring 18 is in a natural state, the sliding block 19 can seal the air outlet 16; when the pressure-bearing spring 18 is in a compressed state, the sliding block 19 moves along the contraction direction of the pressure-bearing spring 18, so that the air outlet 16 is communicated;
the piston 13 can control the air inlet 15 to be closed or communicated through up-and-down reciprocating motion, and pressurizes air when moving upwards, and the pressurized air can push the sliding block 19 to enable the pressure-bearing spring 18 to shrink, so as to control the air outlet 16 to be communicated or closed;
the bottom of the piston cavity is provided with a linear bearing 17 for assisting the piston 13 to reciprocate up and down; specifically, the linear bearing 17 is press-fitted to the bottom inside the piston cavity 47 in an interference fit manner, and the inner circular surface of the linear bearing 17 contacts with the bottom outer circle of the piston 13, so as to ensure that the piston 13 performs a reciprocating motion smoothly.
The piston 13 and the slide block 19 are respectively provided with a plurality of groups of sealing rubber rings 14. The air supercharging device used in the embodiment of the invention realizes supercharging by reciprocating the piston in the piston cavity up and down to compress air. The piston 13 is provided with two groups of sealing rubber rings 14 which are distributed at intervals, when the piston 13 moves downwards, gas enters the cavity of the piston cavity 47 from the gas inlet 15, and at the moment, the sealing rubber rings 14 ensure the sealing between the piston 13 and the piston cavity 47 and prevent the gas from overflowing from the lower end; when the piston 13 moves upwards, the sealing rubber rings 14 which are distributed at intervals are arranged at the upper part and the lower part, so that the sealing between the air inlet 15 and the piston cavity is ensured; meanwhile, a sealing rubber ring is also arranged on the sliding block 19, so that gas cannot overflow from the upper end of the piston cavity when the sliding block 19 moves upwards.
In this embodiment, the schematic structural diagram of the gas-solid secondary mixing device 7 is shown in fig. 5, and as can be seen from fig. 5, the gas-solid secondary mixing device 7 includes:
the device comprises a shell and a rotating shaft 37 arranged in the shell, wherein a plurality of groups of rotating blades 36 are symmetrically arranged on the rotating shaft 37, the upper end of the side wall of the shell is provided with a first air inlet 35, a second air inlet 45 and an air outlet 46 respectively at the top end of the shell and the bottom end of the shell, and the second air inlet 45 is provided with a one-way valve 44;
a bearing support is arranged at the inner bottom of the shell, a lower end bearing 38 is arranged at the central position of the bearing support, a motor stator 40 and a motor rotor 41 are arranged at the inner top of the shell, the motor stator 40 is sleeved outside the motor rotor 41, the bottom end of the rotating shaft 37 is connected with the lower end bearing 38, and the top end of the rotating shaft 37 is connected with a counter bore at the center of the motor rotor 41 through a pressing ring 43;
the bottom of the lower end bearing 38 is also provided with a lower end bearing pressing ring 39 for fixing the lower end bearing 38;
the motor stator 40 is also provided at the top thereof with a stator clamping ring 42.
Example 3
The embodiment provides a method for improving the yield of low-rank reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air with a propping agent, wherein the method utilizes the device for improving the yield of low-rank reservoir coalbed methane by centrifugally mixing high-temperature high-pressure hot air with the propping agent provided by the embodiment 2, and the device comprises the following steps:
(1) The high-temperature and high-pressure hot air discharged from the exhaust end of the air supply tank 1 enters the air pressurizing device 4 to further increase the pressure of the high-temperature and high-pressure hot air;
(2) The high-temperature high-pressure hot air after pressurization in the step (1) enters a gas-solid mixing device 6 and is uniformly mixed with propping agent;
(3) The high-temperature and high-pressure hot air discharged from the exhaust end of the air supply tank 1 and the high-temperature and high-pressure hot air mixed with the propping agent obtained in the step (2) enter a gas-solid secondary mixing device 7, and the high-temperature and high-pressure hot air and the propping agent are mixed more fully and uniformly in the gas-solid secondary mixing device 7;
(4) And (3) injecting the high-temperature and high-pressure hot air mixed with the propping agent obtained in the step (3) into the heat injection well 8, and then carrying out low-level reservoir coalbed methane exploitation.
In this embodiment, in the low-order reservoir coalbed methane exploitation process, the heat injection well 8 and the wellhead of the exploitation well 10 form a well pattern on the ground, and four exploitation wells 10 are uniformly distributed around one heat injection well 8 in the well pattern, as shown in fig. 2.
In step (1) of this embodiment, in the gas pressurizing device used, after the junction box 11 is energized, the linear motor 12 is energized, and with the aid of the linear bearing 17, the piston 13 fixedly connected to the linear motor 11 is driven to reciprocate up and down in the piston chamber. The top of the piston cavity is fixedly provided with a pressure-bearing spring 18, and the bottom of the pressure-bearing spring 18 is connected with a sliding block 19, wherein the stress condition of the sliding block 19 determines the expansion condition of the pressure-bearing spring 18, and further determines the conduction and closure of the air outlet 16.
When the gas pressurizing device works, high-temperature and high-pressure hot air discharged from the exhaust end of the air supply tank 1 enters a piston cavity through an air inlet 15 of the gas pressurizing device 4, the linear motor 12 is electrified to push the piston 13 to move upwards, at the moment, the air inlet 15 is closed, the cavity is closed, the movement of the piston 13 causes the reduction of the volume of the gas, the pressure is increased, when the pressure is increased to a specific value, a sliding block 19 is stressed to press a pressure-bearing spring 18 to shrink, the sliding block 19 moves along the shrinking direction, an air outlet 16 is communicated, and air flow after the pressure is increased flows out through the air outlet 16; after the gas flows out, the air pressure in the piston cavity is reduced, the pressure-bearing spring 18 pushes the sliding block 19 to move downwards, the air outlet 16 is closed, meanwhile, the linear motor 12 drives the piston 13 to move downwards, the air inlet 15 is communicated, and the gas reenters the piston cavity to complete a pressurizing process. In particular, the control of the pressurization ratio can be achieved by adjusting the elastic coefficient of the pressure-bearing spring 18.
In step (2) of the embodiment, the propping agent enters the shell through the discharge pipeline of the bin 24 via the feed inlet of the gas-solid mixing device, and the propping agent contained in the bin 24 is sent to the concave part of the piston 20, after the linear motor 21 is electrified, the piston 22 can horizontally reciprocate under the drive of the linear motor, and the propping agent is sent into the rotating cavity 30 through the opening end of the rotating cavity 30 by the horizontally reciprocating motion of the piston 20, the sealing rubber ring 23 assembled on the piston 22 has a sealing effect, and can effectively prevent the gas in the horizontally reciprocating motion of the piston from flowing back into the bin 24; meanwhile, the addition amount of the propping agent can also be controlled by the horizontal reciprocating motion of the piston 22;
after the propping agent enters the rotating cavity 30, the motor rotor 26 is electrified, the rotating cavity 30 can be driven by the first bearing 29 and the second bearing 32 to rotate at a high speed, the propping agent is centrifugally moved in the rotating cavity 30 and is subjected to centrifugal force, when the rotating speed of the rotating cavity reaches a critical value, the propping agent flies out from a discharge hole 31 on the surface of the rotating cavity 30 and is mixed with pressurized high-temperature and high-pressure hot air (gas) entering through an air inlet of the gas-solid mixing device in a shell of the gas-solid mixing device to form a particle-containing airflow, namely primary mixing is realized.
In step (3) of this embodiment, the high-temperature and high-pressure hot air mixed with the propping agent after primary mixing enters the gas-solid secondary mixing device 7 through the first air inlet, after the motor rotor 41 in the housing of the gas-solid secondary mixing device 7 is electrified, the lower end bearing 38 is combined to drive the rotating shaft 37 and the rotating blade 36 to rotate, the propping agent mixed with the high-temperature and high-pressure hot air flow is stirred again under the action of the rotating blade 36, and is fully mixed with the high-temperature and high-pressure hot air gas entering through the second air inlet 45, and meanwhile, the air pressure in the housing is increased, so that the secondary mixed gas-solid air flow is forced to enter the coal seam through the air outlet 46, thereby being beneficial to fully mixing and conveying the high-temperature and high-pressure hot air and propping agent, and improving the productivity of the coal seam gas in the reservoir; in particular, the second air inlet 45 is connected with the check valve 44, so that the high-temperature and high-pressure hot air can be ensured to enter only through the air inlet 45, and the air can be prevented from flowing back through the second air inlet 45 due to the pressure difference.
In summary, the device and the method for improving the yield of the low-rank reservoir coalbed methane based on centrifugal mixing of high-temperature and high-pressure hot air and propping agent provided by the embodiment of the invention are used for improving the yield of the low-rank reservoir coalbed methane based on centrifugal mixing of the high-temperature and high-pressure hot air and propping agent, and the device and the method enable the high-temperature and high-pressure hot air and propping agent to be uniformly mixed and then injected into a heat injection well through the air outlet of a gas solid secondary mixing device. The adsorption capacity of the coal reservoir is reduced while the temperature of the coal bed is raised, and the desorption of methane molecules is promoted, so that the yield of low-rank coal bed gas is improved. Meanwhile, the propping agent is filled in the rock stratum cracks, and plays a role in supporting the cracks not to be closed due to stress release, so that high diversion capacity is maintained, oil gas is unblocked, and the yield is increased.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical invention can be freely combined for use.
Claims (17)
1. The gas-solid mixing device is characterized by comprising a shell and a stock bin (24), wherein an air inlet (20) is formed in one end of the shell, a first air outlet (34) is formed in the other end of the shell, and a feed inlet is formed in the side wall of the shell; a first piston (22) and a rotary cavity (30) are arranged in the shell, the first piston (22) is provided with a concave part, and a plurality of discharge holes (31) are distributed on the surface of the rotary cavity (30);
a first linear motor (21) is arranged in the shell and close to the air inlet (20), the first linear motor (21) is connected with one end of the first piston (22) so that the first piston (22) can horizontally reciprocate along the horizontal axis direction of the shell, a discharge pipeline of the storage bin (24) enters the shell through the feed inlet, propping agent contained in the storage bin (24) is sent to a concave position of the first piston (22), and then the propping agent is sent into the rotating cavity (30) through the opening end of the rotating cavity (30) through the horizontal reciprocation of the first piston (22);
still be provided with first bearing frame (28) and second bearing frame (33) in the casing respectively, the center department of first bearing frame (28) and second bearing frame (33) is provided with first bearing (29) and second bearing (32) respectively, the closed end of rotatory chamber (30) with second bearing (32) are connected, the open end of rotatory chamber (30) passes first bearing (29) links to each other with first motor rotor (26) and first motor rotor (26) overcoat is equipped with first motor stator (27) to make after first motor rotor (26) circular telegram, rotatory chamber (30) can rotate under first bearing (29) and second bearing (32) drive.
2. The gas-solid mixing device according to claim 1, wherein the rotation chamber (30) is a conical chamber.
3. The gas-solid mixing device according to claim 1 or 2, characterized in that the first piston (22) is provided with a first sealing rubber ring (23) to avoid backflow of gas into the silo (24) during the reciprocating movement of the first piston (22).
4. A gas-solid mixing device according to claim 1 or 2, characterized in that the open end of the rotating chamber (30) passes through the first bearing (29) and is connected to the first motor rotor (26) by means of a bearing clamp (25).
5. An apparatus for increasing the yield of coalbed methane from a low-rank reservoir, the apparatus comprising:
a gas supply tank (1), a gas pressurizing device (4), a gas-solid mixing device (6) and a gas-solid secondary mixing device (7) according to any one of claims 1 to 4;
the exhaust end of the gas supply tank (1) is connected with a second gas inlet (45) of the gas-solid secondary mixing device (7) and a gas inlet (15) of the gas pressurizing device (4) through a first pipeline (2) and a second pipeline (3), a second gas outlet (16) of the gas pressurizing device (4) is connected with a gas inlet (20) of the gas-solid mixing device (6) through a third pipeline (5), and a first gas outlet (34) of the gas-solid mixing device (6) is connected with a first gas inlet (35) of the gas-solid secondary mixing device (7); and a third air outlet (46) of the gas-solid secondary mixing device (7) is connected with a wellhead of the heat injection well (8).
6. The apparatus of claim 5, wherein the means for increasing the production of low-rank reservoir coalbed methane further comprises a display (9).
7. The device according to claim 5 or 6, wherein the gas pressurizing device (4) comprises a shell and a junction box (11), the top end of the shell is closed, the bottom end of the shell is fixedly connected with the junction box (11), a second linear motor (12) is arranged on the junction box (11) at the bottom in the shell, a piston cavity is further arranged in the shell, and a second gas outlet (16) and a gas inlet (15) are respectively formed in the upper end and the middle lower end of the side wall of the shell and the piston cavity so as to enable the piston cavity to be communicated with the outside; a second piston (13) is arranged in the piston cavity, the second piston (13) can reciprocate up and down in the piston cavity, the bottom of the second piston (13) is connected with the second linear motor (12), a pressure-bearing spring (18) is fixedly arranged at the top of the piston cavity, and a sliding block (19) is connected with the bottom of the pressure-bearing spring (18); when the pressure-bearing spring (18) is in a natural state, the sliding block (19) can seal the second air outlet (16); when the pressure-bearing spring (18) is in a compressed state, the sliding block (19) moves along the contraction direction of the pressure-bearing spring (18) to enable the second air outlet (16) to be communicated;
the second piston (13) can control the air inlet (15) to be closed or communicated through up-and-down reciprocating motion, and pressurizes air when moving upwards, the pressurized air can push the sliding block (19) to enable the pressure-bearing spring (18) to shrink, and then the second air outlet (16) is controlled to be communicated or closed.
8. Device according to claim 7, characterized in that the bottom of the piston chamber is provided with a linear bearing (17) for assisting the up-and-down reciprocating movement of the second piston (13).
9. The device according to claim 7, characterized in that the second piston (13) and the slide (19) are provided with sets of second sealing rubber rings (14), respectively.
10. The device according to claim 5 or 6, characterized in that said gas-solid secondary mixing device (7) comprises: the device comprises a shell and a rotating shaft (37) arranged in the shell, wherein a plurality of groups of rotating blades (36) are arranged on the rotating shaft (37), the upper end of the side wall of the shell is provided with a first air inlet (35), a second air inlet (45) and a third air outlet (46) respectively at the top end of the shell and the bottom end of the shell, and the second air inlet (45) is provided with a one-way valve (44);
the inner bottom of the shell is provided with a bearing support, the center of the bearing support is provided with a lower end bearing (38), the inner top of the shell is provided with a second motor stator (40) and a second motor rotor (41), the second motor stator (40) is sleeved outside the second motor rotor (41), the bottom end of the rotating shaft (37) is connected with the lower end bearing (38), and the top end of the rotating shaft (37) is connected with a counter bore in the center of the second motor rotor (41) through a pressing ring (43).
11. The device according to claim 10, characterized in that a lower end bearing clamping ring (39) is mounted at the bottom of the lower end bearing (38) for fixing the lower end bearing (38).
12. The device according to claim 10, characterized in that the top of the second motor stator (40) is provided with a stator clamping ring (42).
13. A method of increasing the yield of low-rank-reservoir coalbed methane, the method utilizing the device for increasing the yield of low-rank-reservoir coalbed methane of any one of claims 5-12, comprising the steps of:
(1) The high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters the air pressurizing device to further increase the pressure of the high-temperature high-pressure hot air;
(2) The high-temperature high-pressure hot air after pressurization in the step (1) enters a gas-solid mixing device and is uniformly mixed with a propping agent;
(3) The high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank and the high-temperature high-pressure hot air mixed with the propping agent obtained in the step (2) enter a gas-solid secondary mixing device, and the high-temperature high-pressure hot air and the propping agent are mixed more fully and uniformly in the gas-solid secondary mixing device;
(4) And (3) injecting the high-temperature and high-pressure hot air mixed with the propping agent obtained in the step (3) into an injection well, and then, exploiting the low-order reservoir coalbed methane.
14. The method of claim 13, wherein during the low-level reservoir coalbed methane production, the heat injection well and the wellhead of the production well form a well pattern at the surface, and four production wells are uniformly distributed around one heat injection well in the well pattern.
15. The method according to claim 13 or 14, wherein in the step (1), the gas pressurizing device (4) comprises a housing and a junction box (11), the top end of the housing is closed, the bottom end of the housing is fixedly connected with the junction box (11), a second linear motor (12) is arranged on the junction box (11) at the bottom of the housing, a piston cavity is further arranged in the housing, and a second gas outlet (16) and a gas inlet (15) are respectively formed at the upper end and the middle lower end of the side wall of the housing and the piston cavity so as to enable the piston cavity to be communicated with the outside; a second piston (13) is arranged in the piston cavity, the second piston (13) can reciprocate up and down in the piston cavity, the bottom of the second piston (13) is connected with the second linear motor (12), a pressure-bearing spring (18) is fixedly arranged at the top of the piston cavity, and a sliding block (19) is connected with the bottom of the pressure-bearing spring (18); when the pressure-bearing spring (18) is in a natural state, the sliding block (19) can seal the second air outlet (16); when the pressure-bearing spring (18) is in a compressed state, the sliding block (19) moves along the contraction direction of the pressure-bearing spring (18) to enable the second air outlet (16) to be communicated;
the second piston (13) can control the air inlet (15) to be closed or communicated through up-and-down reciprocating motion, and pressurizes air when moving upwards, the pressurized air can push the sliding block (19) to enable the pressure-bearing spring (18) to shrink, and then the second air outlet (16) is controlled to be communicated or closed;
the step (1) comprises the following specific steps:
the high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters a piston cavity through an air inlet of the air pressurizing device, the second linear motor is electrified to push the second piston to move upwards, the air inlet is closed at the moment, the piston cavity is sealed, the movement of the second piston causes the volume of air to be reduced, the pressure is increased, when the pressure is increased to a specific value, the sliding block is stressed to extrude the pressure-bearing spring to shrink, the sliding block moves along the shrinkage direction, the second air outlet is communicated, and the air flow after the pressure is increased flows out through the second air outlet; the pressure in the piston cavity is reduced after the gas flows out, the pressure-bearing spring pushes the sliding block to move downwards, the second gas outlet is closed, the second linear motor drives the second piston to move downwards, the gas inlet is communicated, and the gas reenters the piston cavity to complete a one-time pressurizing process.
16. The method according to claim 13 or 14, wherein in step (3), the gas-solid secondary mixing device (7) comprises: the device comprises a shell and a rotating shaft (37) arranged in the shell, wherein a plurality of groups of rotating blades (36) are arranged on the rotating shaft (37), the upper end of the side wall of the shell is provided with a first air inlet (35), a second air inlet (45) and a third air outlet (46) respectively at the top end of the shell and the bottom end of the shell, and the second air inlet (45) is provided with a one-way valve (44);
the inner bottom of the shell is provided with a bearing support, the center of the bearing support is provided with a lower end bearing (38), the inner top of the shell is provided with a second motor stator (40) and a second motor rotor (41), the second motor stator (40) is sleeved outside the second motor rotor (41), the bottom end of the rotating shaft (37) is connected with the lower end bearing (38), and the top end of the rotating shaft (37) is connected with a counter bore in the center of the second motor rotor (41) through a pressing ring (43);
the step (3) comprises the following specific steps:
after the high-temperature high-pressure hot air mixed with the propping agent obtained in the step (2) enters the gas-solid secondary mixing device, the second motor rotor is electrified, a plurality of groups of rotating blades arranged on the rotating shaft rotate at a high speed under the drive of the second motor rotor, the upper end bearing and the lower end bearing, the high-temperature high-pressure hot air mixed with the propping agent is stirred again under the action of the rotating blades and is fully mixed with the high-temperature high-pressure hot air entering through the second air inlet of the gas-solid secondary mixing device for the second time, and meanwhile, the air pressure in the shell of the gas-solid secondary mixing device is increased, so that the gas-solid air flow with the second full mixing enters the coal seam through the third air outlet.
17. The method of claim 13 or 14, wherein the proppant comprises one or a combination of several of quartz sand, spherical-shaped ceramic sand, and sintered bauxite.
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| US9083213B1 (en) * | 2014-01-09 | 2015-07-14 | Intevep, S.A. | Microgenerator for hydrocarbon producing systems |
| US9827540B2 (en) * | 2014-05-19 | 2017-11-28 | Highland Fluid Technology, Ltd. | Central entry dual rotor cavitation |
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| US6991362B1 (en) * | 1998-04-02 | 2006-01-31 | Seaman Anthony E | Agitators for wave-making or mixing as for tanks, and pumps and filters |
| US7401973B1 (en) * | 2007-04-19 | 2008-07-22 | Vortex Ventures, Inc. | Dust-free low pressure mixing system |
| CN102378650A (en) * | 2009-02-05 | 2012-03-14 | 阿尔法拉瓦尔股份有限公司 | A plant for separating oil from a gas mixture, and a method for separating oil from a gas mixture |
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