CN114961670A - Gas-solid mixing device, device and method for improving low-order reservoir coal bed gas yield - Google Patents

Gas-solid mixing device, device and method for improving low-order reservoir coal bed gas yield Download PDF

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Publication number
CN114961670A
CN114961670A CN202110196035.7A CN202110196035A CN114961670A CN 114961670 A CN114961670 A CN 114961670A CN 202110196035 A CN202110196035 A CN 202110196035A CN 114961670 A CN114961670 A CN 114961670A
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China
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gas
piston
mixing device
rotating shaft
pressure
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CN114961670B (en
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陈浩
庚勐
陈振宏
田文广
郭为
祁灵
李亚男
邓泽
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Petrochina Co Ltd
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Petrochina Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/166Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168Injecting a gaseous medium

Abstract

The invention provides a gas and solid mixing device, a device and a method for improving the yield of low-order reservoir coal bed methane, wherein the device for improving the yield of the low-order reservoir coal bed methane comprises a gas supply tank, a gas supercharging device, a gas and solid mixing device and a gas and solid secondary mixing device; the gas outlet of the gas solid mixing device is connected with the gas inlet of the gas solid secondary mixing device; and a second gas outlet of the gas-solid secondary mixing device is connected with a wellhead of the heat injection well. The invention can realize continuous heating and fracturing of the coal bed, is convenient for high-efficiency construction and mining operation, and improves the desorption rate of the coal bed gas, thereby generating a large amount of artificial fractures. The adsorption capacity of a coal reservoir is reduced while the temperature of the coal bed is raised, the desorption of methane molecules is promoted, and the yield of low-rank coal bed gas is increased.

Description

Gas-solid mixing device, device and method for improving low-order reservoir coal bed gas yield
Technical Field
The invention relates to a gas-solid mixing device, a device and a method for improving the yield of low-order reservoir coal bed gas, and belongs to the technical field of coal bed gas exploitation.
Background
The coal bed gas is unconventional natural gas associated with coal, has a main component of methane, is an important clean energy source, and is a high-quality chemical raw material. Low-rank coal seam gas is the main object of coal seam gas development in the world. Currently, only the united states, canada, australia and china are countries in the world that have successfully achieved the exploitation and utilization of coal bed methane on a large scale. The coal bed gas yield in the United states, Canada and Australia mostly comes from low-coal-rank coal bed gas, and the coal bed gas yield in China mostly comes from medium-coal-rank and high-coal-rank coal bed gas at east edge of Shanxi Qin water basin and Ordos basin.
However, the development effect of low-rank coal bed gas in China is not ideal, and the main reasons are that the geological structure of a reservoir formation region is complex, the exploitation and utilization difficulty is high, the low-rank coal gasification degree is low, the number of pores is relatively large, the matrix is loose, the permeability of a reservoir is extremely low, and the yield of the coal bed gas is difficult to effectively improve.
At present, various extraction methods of coal bed gas are adopted, the coal bed gas is extracted by heat injection, the effective measure for improving the permeability of a low-coal-rank reservoir is generally accepted, many scholars at home and abroad explore the influence rule of temperature on the gas desorption rate in a coal body, and the experimental result shows that the desorption rate of the coal bed gas in the coal body can be increased by improving the temperature. However, the traditional methods for heating the coal reservoir by electric heating and heating the coal reservoir by high-temperature superheated steam have the disadvantages of large resource consumption, high cost and low economic effect, so that the industrial and large-scale implementation and application are difficult to realize.
Therefore, it has become a technical problem to be solved in the art to provide a novel gas-solid mixing device, a device and a method for improving the low-rank reservoir coal bed methane yield by mixing high-temperature and high-pressure hot air with a proppant based on reciprocating motion.
Disclosure of Invention
To address the above-described shortcomings and drawbacks, it is an object of the present invention to provide a gas-solids mixing device.
The invention also aims to provide a device for improving the yield of the coal bed gas of the low-rank reservoir.
It is still another object of the present invention to provide a method for increasing the coal bed gas yield of low rank reservoirs.
To achieve the above object, in one aspect, the present invention provides a gas-solid mixing device, wherein the gas-solid mixing device comprises: the piston type gas cylinder comprises a shell, a piston cavity arranged inside the shell and a bin arranged outside the shell;
the top end and the bottom end of the shell are respectively provided with a first air inlet and a first air outlet; the motor supporting seat and the supporting base are respectively arranged at the bottom in the shell from bottom to top, the piston cavity is arranged on the supporting base, a piston is arranged in the piston cavity, the piston is a revolving body with two thick ends and a thin middle part, the piston can reciprocate up and down in the piston cavity, and in the reciprocating motion, the piston and the inner wall of the piston cavity form a sealed unloading cavity;
a feed pipe of the storage bin penetrates through the shell and is communicated with a feed inlet of the piston cavity so as to inject the proppant in the storage bin into the discharge cavity;
linear electric motor is installed to the motor supporting seat, linear electric motor with the bottom of piston links to each other, works as during the piston downstream, the feed inlet that the proppant in the feed bin can pass through the piston chamber pours into and is full of into the unloading chamber, works as when piston upward movement and the intracavity proppant height of unloading are higher than the height in piston chamber, the proppant is followed the chamber top of unloading and is dumped all around and get into the high temperature high-pressure gas homogeneous mixing in the casing from first air inlet.
In the gas-solid mixing device provided by the invention, the outer diameters of the two ends of the piston are basically consistent with the inner diameter of the piston cavity, so that the discharge cavity is better sealed on the premise of ensuring that the piston can do up-and-down reciprocating motion in the piston cavity.
As a specific embodiment of the gas-solid mixing device of the present invention, two ends of the piston are respectively provided with a sealing rubber ring, so that when the proppant in the storage bin is injected into the discharging cavity, the discharging cavity is sealed, and at this time, the gas flow cannot enter the discharging cavity, thereby ensuring successful charging.
As a specific embodiment of the above gas-solid mixing device of the present invention, the height of the feeding hole is between the heights of the sealing rubber rings respectively disposed at the two ends of the piston.
In a preferred embodiment of the present invention, the sealing rubber ring is made of an annular rubber material and has a certain elasticity, and the annular groove can be formed in the piston, and the sealing rubber ring is stretched and fixed in the annular groove formed in the piston.
In addition, in the gas-solid mixing device provided by the invention, the linear motor can control the speed and the movement amount of the up-and-down reciprocating motion of the piston, so that the feeding amount of the propping agent can be accurately controlled.
The gas-solid mixing device provided by the invention mainly realizes the functions of proppant feeding and primary gas-solid mixing.
In another aspect, the present invention further provides an apparatus for increasing the yield of low-rank reservoir coalbed methane, wherein the apparatus for increasing the yield of low-rank reservoir coalbed methane comprises:
the gas supply tank, the gas supercharging device, the gas-solid mixing device and the gas-solid secondary mixing device are arranged in the gas supply tank;
the gas inlet of the gas pressurizing device is connected with the gas inlet of the gas pressurizing device through a first pipeline, the gas outlet of the gas pressurizing device is connected with the gas inlet of the gas-solid mixing device through a second pipeline, and the gas outlet of the gas-solid mixing device is connected with the gas inlet of the gas-solid secondary mixing device; and a second gas outlet of the gas-solid secondary mixing device is connected with a wellhead of the heat injection well.
As a specific embodiment of the above device of the present invention, the device further comprises a display.
As a specific embodiment of the above device, the gas-solid secondary mixing device includes a housing and a rotating shaft disposed in the housing, the rotating shaft is provided with a plurality of sets of rotating blades, the top end and the bottom end of the housing are respectively provided with a second gas inlet and a second gas outlet, the bottom of the housing is provided with a bearing support, a lower end bearing is mounted at the center of the bearing support, the top of the housing 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 to the lower end bearing, and the top end of the rotating shaft is connected to a counter bore at the center of the motor rotor through a pressing ring.
In a specific embodiment of the present invention, a counter bore is disposed in the center of the motor rotor, the outer edge of the top end of the rotating shaft is 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 to the counter bore in the center of the motor rotor, so as to connect the motor rotor and the rotating shaft.
As a specific embodiment of the above device of the present invention, a pressure relief opening is formed in a side wall of the housing, and the pressure relief opening is provided with a pressure relief valve.
When the air pressure in the gas-solid secondary mixing device exceeds a set value, the pressure reducing valve can be switched on, gas is discharged from the pressure relief port, the pressure in the device is reduced until the set value is reached, and the safety and the stability of the whole system are effectively protected.
As a specific embodiment of the above device of the present invention, a lower bearing pressing ring is installed at the bottom of the lower bearing for fixing the lower bearing.
As a specific embodiment of the above device of the present invention, a stator pressing ring is disposed on the top of the motor stator.
As an embodiment of the above device of the present invention, wherein the gas pressurizing device comprises: the volute comprises a junction box, a volute shell, an impeller and a rotating shaft, wherein the impeller and the rotating shaft are arranged in the volute shell; one end of the volute casing is fixedly connected with the junction box, and the other end of the volute casing is provided with a volute air inlet and a volute air outlet; the volute casing is internally provided with a first magnet and a second magnet which are opposite in magnetism, one end of the rotating shaft is connected with the junction box through a bearing, the other end of the rotating shaft is connected with the impeller, the rotating shaft is provided with a rotor, and the rotor is positioned between the first magnet and the second magnet, so that the rotor can rotate under the driving of Lorentz force generated by a magnetic field existing between the first magnet and the second magnet after the junction box is electrified, and the rotating shaft and the impeller can be driven to rotate.
The device for improving the yield of the low-order reservoir coal bed gas has the advantages that the distribution of all the components and the arrangement of the used connecting pipelines are attractive and reasonable, the space utilization rate of an experimental site is effectively improved, and the device is convenient to overhaul and maintain.
In still another aspect, the present invention provides a method for increasing the yield of low-rank reservoir coal bed gas, wherein the method utilizes the above-mentioned device for increasing the yield of low-rank reservoir coal bed gas, and comprises the following steps:
(1) high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters an air boosting device to further increase the pressure of the high-temperature high-pressure hot air;
(2) the high-temperature high-pressure hot air pressurized in the step (1) enters a gas-solid mixing device to be uniformly mixed with a propping agent (primary mixing);
(3) the high-temperature high-pressure hot air mixed with the proppant obtained in the step (2) enters a gas-solid secondary mixing device, and the high-temperature high-pressure hot air and the proppant are more fully and uniformly mixed (secondary mixing) in the gas-solid secondary mixing device;
(4) and (4) injecting the high-temperature high-pressure hot air mixed with the proppant obtained in the step (3) into a heat injection well, and then mining the low-rank reservoir coal bed gas.
In a specific embodiment of the method, during the extraction of the low-rank reservoir coal bed gas, the heat injection wells and the well heads of the extraction wells form a well pattern on the ground, and four extraction wells are uniformly distributed around one heat injection well in the well pattern. The device and the operation are beneficial to large-scale exploitation and utilization of the coal bed gas, and the economic benefit is improved.
As a specific embodiment of the above method of the present invention, wherein the step (1) comprises the following specific steps:
high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters the air supercharging device through a volute air inlet of the air supercharging device, after a junction box of the air supercharging device is electrified, the impeller rotates at a high speed under the driving of the rotor and the rotating shaft, and after the impeller blades rotate and compress, the high-temperature high-pressure hot air realizes further supercharging.
As a specific embodiment of the above method of the present invention, wherein the step (2) comprises the following specific steps:
after the linear motor is electrified, the piston is driven to move downwards, so that the propping agent in the storage bin is injected through the feed inlet of the piston cavity and fills the unloading cavity, and the loading is finished;
after the feeding is finished, the linear motor is electrified to push the piston to move upwards, and when the height of the propping agent in the discharging cavity is higher than that of the piston cavity, the propping agent is dumped from the top of the discharging cavity to the periphery under the action of gravity and is uniformly mixed with high-temperature and high-pressure gas entering the shell of the gas-solid mixing device from the first gas inlet.
As a specific embodiment of the above method of the present invention, wherein 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 motor rotor is electrified, a plurality of groups of rotating blades arranged on the rotating shaft rotate at a high speed under the driving of the motor rotor and the lower end bearing, the high-temperature high-pressure hot air generates vortex under the influence of the high-speed rotation of the rotating blades, and the propping agent is further dispersed under the influence of the high-speed rotation and is more fully and uniformly mixed with the high-temperature high-pressure hot air (namely, the secondary uniform mixing process).
As a specific embodiment of the above method of the present invention, in step (3), when the gas pressure in the gas-solid secondary mixing device is too high, the method comprises: and opening a pressure reducing valve of the gas-solid secondary mixing device to discharge gas through a pressure relief opening until the gas pressure in the gas-solid secondary mixing device reaches a set value. The operation can realize the controllable air pressure in the gas-solid secondary mixing device, and plays a role in ensuring the safety and stability of the system.
As a specific embodiment of the above method of the present invention, the proppant comprises one or a combination of several of quartz sand, spherical ceramsite sand and sintered alumina.
The invention does not make specific requirements on the pressure and the temperature of the high-temperature high-pressure hot air used, the pressure and the temperature of the high-temperature high-pressure hot air pressurized in the step (1), and the like, and technicians in the field can reasonably set the pressure and the temperature of the high-temperature high-pressure hot air used according to the actual operation needs on site, such as specific geological conditions (including depth, fracture development condition and the like) to be exploited, and the like, and the pressure and the temperature of the high-temperature high-pressure hot air pressurized in the step (1) can be ensured as long as the purpose of the invention can be realized.
In addition, the invention does not make specific requirements on the primary mixing time in the step (2) and the secondary mixing time in the step (3), and a person skilled in the art can reasonably set the mixing time according to the actual operation needs on site as long as the primary mixing and secondary mixing alternating mixing mode used by the invention is adopted to fully and uniformly mix the high-temperature high-pressure hot air and the propping agent.
The device and the method for improving the low-order reservoir coal bed methane yield are based on the reciprocating motion mixing of high-temperature high-pressure hot air and a propping agent, the high-temperature high-pressure hot air and the propping agent are uniformly mixed and then are injected into a heat injection well through an air outlet of a gas-solid secondary mixing device, the continuous heating and fracturing of a coal bed can be realized through the operation, the high-efficiency construction and exploitation operation is convenient to perform, the desorption rate of the coal bed methane is improved, and a large number of artificial fractures are generated. The adsorption capacity of a coal reservoir is reduced while the temperature of the coal bed is raised, the desorption of methane molecules is promoted, and the yield of low-rank coal bed gas is further improved. Meanwhile, the propping agent is filled in the rock stratum fracture to play a role in propping the fracture not to be closed due to stress release, so that high flow conductivity is kept, oil and gas are smooth, 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 needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for improving the coal bed methane yield of a low-rank reservoir based on reciprocating motion mixing of high-temperature and high-pressure hot air and a proppant provided by an embodiment of the invention.
FIG. 2 is a schematic diagram of a well pattern layout suitable for use with the apparatus provided in embodiments of the present invention.
Fig. 3 is a schematic structural view of a gas booster used in the embodiment of the present invention.
FIG. 4 is a schematic structural diagram of a gas-solids mixing apparatus used in an embodiment of the present invention.
Fig. 5 is a schematic structural view (enlarged sectional view) of a gas-solid secondary mixing device used in the embodiment of the present invention.
The main reference numbers illustrate:
FIG. 1: 1. gas supply tank, 2, first pipeline, 3, gas supercharging device, 4, second pipeline, 5, gas solid mixing device, 6, gas solid secondary mixing device, 7, heat injection well, 8, display.
FIG. 2: 7. and 9, a heat injection well and a recovery well.
FIG. 3: 3. the gas supercharging device comprises a gas supercharging device 10, a junction box 11, a volute casing 12, a first magnet 13, an impeller 14, a volute gas inlet 15, a volute gas outlet 16, a rotor 17, a second magnet 18 and a rotating shaft.
FIG. 4: 5. gas-solid mixing device, 19, first air inlet, 20, piston, 21, unloading chamber, 22, sealing rubber circle, 23, piston chamber, 24, support base, 25, motor supporting seat, 26, linear electric motor, 27, feed bin, 28, feed inlet, 29, first gas outlet.
FIG. 5: 6. the gas-solid secondary mixing device comprises a gas-solid secondary mixing device 30, a second gas inlet 31, a stator pressing ring 32, a motor stator 33, a motor rotor 34, a pressing ring 36, a rotating shaft 37, a rotating blade 38, a lower end bearing 39, a bearing support 40, a lower end bearing pressing ring 41, a pressure relief opening 42, a pressure relief valve 43 and a second gas outlet.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
It should be noted that the term "comprises/comprising" and any variations thereof in the description and claims of this invention and the above-described drawings is intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
In addition, the terms "disposed" and "connected" in the present invention should be interpreted broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can 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 meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Example 1
The present embodiment provides a gas-solid mixing device, the structural schematic diagram of which is shown in fig. 4, and as can be seen from fig. 4, the gas-solid mixing device includes:
the piston comprises a shell, a piston cavity 23 arranged in the shell and a storage bin 27 arranged outside the shell;
the top end and the bottom end of the shell are respectively provided with a first air inlet 19 and a first air outlet 29; a motor supporting seat 25 and a supporting base 24 are respectively arranged at the bottom in the shell from bottom to top, the piston cavity 23 is arranged on the supporting base 24, a piston 20 is arranged in the piston cavity 23, the piston 20 is a revolving body with two thick ends and a thin middle part, the piston 20 can reciprocate up and down in the piston cavity 23, and the piston 20 and the inner wall of the piston cavity 23 can form a sealed discharging cavity 21 in the reciprocating motion;
a feed pipe of the bin 27 is communicated with the feed port 28 of the piston cavity 23 through the shell so as to inject the proppant in the bin 27 into the discharge cavity 21;
the motor support seat 25 is provided with a linear motor 26, the linear motor 26 is connected with the bottom end of the piston 20, when the piston 20 moves downwards, the propping agent in the bin 27 can be injected and filled in the discharging cavity 21 through the feed inlet 28 of the piston cavity 23, and when the piston 20 moves upwards and the propping agent in the discharging cavity 21 is higher than the piston cavity 23, the propping agent is dumped from the top of the discharging cavity 21 to the periphery and is uniformly mixed with the high-temperature and high-pressure gas entering the shell from the first air inlet 19.
In this embodiment, two ends of the piston 20 are respectively provided with a sealing rubber ring 22 to seal the discharging cavity 21 when the proppant in the bin 27 is injected into the discharging cavity 21; specifically, the sealing rubber ring used in this embodiment is made of an annular rubber material, has a certain elasticity, and can be provided with an annular groove on the piston, and the sealing rubber ring is fixed in the annular groove provided in the piston after being stretched.
In this embodiment, the height of the feed port 28 is between the heights of the sealing rubber rings 22 respectively disposed at the two ends of the piston 20.
Example 2
The embodiment provides a device for improving the yield of low-rank reservoir coal bed gas by mixing high-temperature and high-pressure hot air with a proppant based on reciprocating motion, which is schematically shown in fig. 1, and as can be seen from fig. 1, the device comprises: a gas supply tank 1, a gas pressurizing device 3, the gas-solid mixing device 5 and the gas-solid secondary mixing device 6 provided in example 1;
the exhaust end of the gas supply tank 1 is connected with a volute gas inlet 14 of the gas supercharging device 3 through a first pipeline 2, a volute gas outlet 15 of the gas supercharging device 3 is connected with a gas inlet 19 of a gas-solid mixing device 5 through a second pipeline 4, and a gas outlet 29 of the gas-solid mixing device 5 is connected with a gas inlet 30 of the gas-solid secondary mixing device 6; and a second gas outlet 43 of the gas-solid secondary mixing device 6 is connected with the wellhead of the heat injection well 7.
In this embodiment, the device further comprises a display 8.
In this embodiment, a schematic structural diagram of the gas-solid secondary mixing device 6 is shown in fig. 5, and as can be seen from fig. 5, the device includes:
the motor comprises a shell and a rotating shaft 36 arranged in the shell, wherein a plurality of groups of rotating blades 37 are symmetrically arranged on the rotating shaft 36, a second air inlet 30 and a second air outlet 43 are respectively arranged at the top end and the bottom end of the shell, a bearing support 39 is arranged at the bottom in the shell, a lower end bearing 38 is arranged at the center of the bearing support 39, a motor stator 32 and a motor rotor 33 are arranged at the top in the shell, the motor stator 32 is sleeved outside the motor rotor 33, the bottom end of the rotating shaft 36 is connected with the lower end bearing 38, and the top end of the rotating shaft 36 is connected with a counter bore at the center of the motor rotor 33 through a pressing ring 34; specifically, a counter bore is arranged in the center of the motor rotor 33, the outer edge of the top end of the rotating shaft 36 is in a threaded structure, the pressing ring 34 is connected with the threaded structure of the outer edge of the top end of the rotating shaft 36, and the top end of the rotating shaft 36 is fixed in the counter bore in the center of the motor rotor 33, so that the motor rotor 33 is connected with the rotating shaft 36;
a pressure relief port 41 is formed in the side wall of the shell, and a pressure relief valve 42 is arranged in the pressure relief port 41;
a lower end bearing pressing ring 40 is mounted at the bottom of the lower end bearing 38 and used for fixing the lower end bearing 38;
the top of the motor stator 32 is provided with a stator pressing ring 31.
In this embodiment, a schematic structural diagram of the gas pressurization device 3 is shown in fig. 3, and as can be seen from fig. 3, the device includes:
a junction box 10, a volute housing 11, an impeller 13 arranged in the volute housing 11, and a rotating shaft 18; one end of the volute casing 11 is fixedly connected with the junction box 10, and the other end of the volute casing 11 is provided with a volute air inlet 14 and a volute air outlet 15;
the volute casing 11 is further symmetrically provided with a first magnet 12 and a second magnet 17 which are opposite in magnetism, one end of the rotating shaft 18 is connected with the junction box 10 through a bearing, the other end of the rotating shaft is connected with the impeller 13, the rotating shaft 18 is provided with a rotor 16, and the rotor 16 is located between the first magnet 12 and the second magnet 17, so that after the junction box 10 is powered on, the rotor 16 can rotate under the driving of a lorentz force generated by a magnetic field existing between the first magnet 12 and the second magnet 17, and the rotating shaft 18 and the impeller 13 can be driven to rotate.
Example 3
The embodiment provides a method for improving the yield of low-rank reservoir coal bed gas by mixing high-temperature and high-pressure hot air with a proppant based on reciprocating motion, wherein the method utilizes the device for improving the yield of low-rank reservoir coal bed gas by mixing the high-temperature and high-pressure hot air with the proppant based on reciprocating motion, which comprises the following steps:
(1) high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters an air boosting device to further increase the pressure of the high-temperature high-pressure hot air;
(2) the high-temperature high-pressure hot air pressurized in the step (1) enters a gas-solid mixing device to be uniformly mixed with a propping agent;
(3) the high-temperature high-pressure hot air mixed with the proppant obtained in the step (2) enters a gas-solid secondary mixing device, and the high-temperature high-pressure hot air and the proppant are more fully and uniformly mixed in the gas-solid secondary mixing device;
(4) and (4) injecting the high-temperature high-pressure hot air mixed with the proppant obtained in the step (3) into a heat injection well, and then mining the low-rank reservoir coal bed gas.
In this embodiment, in the process of mining the low-rank reservoir coal bed gas, the heat injection wells 7 and the extraction wells 9 form a well pattern on the ground, four extraction wells 9 are uniformly distributed around one heat injection well 7 in the well pattern, and a specific well pattern layout diagram is shown in fig. 2.
In this embodiment, the step (1) includes the following specific steps:
high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters the gas supercharging device through a volute air inlet of the gas supercharging device, after a junction box of the gas supercharging device is electrified, the impeller is driven by the rotor and the rotating shaft to rotate at a high speed, after the impeller blades rotate and compress, the high-temperature high-pressure hot air realizes further supercharging, and the supercharged high-temperature high-pressure hot air is discharged through a volute air outlet and is conveyed to the gas and solid mixing device through a second pipeline.
In this embodiment, the step (2) includes the following specific steps:
after the linear motor is electrified, the piston is driven to move downwards, so that the propping agent in the storage bin is injected through the feed inlet of the piston cavity and fills the unloading cavity, and the loading is finished;
after the feeding is finished, the linear motor is electrified to push the piston to move upwards, and when the height of the propping agent in the discharging cavity is higher than that of the piston cavity, the propping agent is dumped from the top of the discharging cavity to the periphery under the action of gravity and is uniformly mixed with high-temperature and high-pressure gas entering the shell of the gas-solid mixing device from the first gas inlet.
In this embodiment, 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 driving of the motor rotor and the lower end bearing, the high-temperature high-pressure hot air is influenced by the high-speed rotation of the rotating blades to generate vortex, and the propping agent is further dispersed under the influence of the high-speed rotation and is more fully and uniformly mixed with the high-temperature high-pressure hot air.
In this embodiment, in step (3), when the gas pressure in the gas-solid secondary mixing device is too high, the method includes: and opening a pressure reducing valve of the gas-solid secondary mixing device to discharge gas through a pressure relief opening until the gas pressure in the gas-solid secondary mixing device reaches a set value.
In summary, the device and the method for improving the low-rank reservoir coal bed gas yield provided by the embodiments of the present invention are a device and a method for improving the low-rank reservoir coal bed gas yield based on the reciprocating motion mixing of high-temperature high-pressure hot air and a proppant, wherein the high-temperature high-pressure hot air and the proppant are uniformly mixed and then are injected into a heat injection well together through an air outlet of a gas-solid secondary mixing device. The adsorption capacity of a coal reservoir is reduced while the temperature of the coal bed is raised, the desorption of methane molecules is promoted, and the yield of low-rank coal bed gas is further improved. Meanwhile, the propping agent is filled in the rock stratum fracture to play a role in propping the fracture not to be closed due to stress release, so that high flow conductivity is kept, oil and gas are smooth, and the yield is increased.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.

Claims (17)

1. A gas-solids mixing apparatus, comprising: the piston type piston comprises a shell, a piston cavity (23) arranged inside the shell and a bin (27) arranged outside the shell;
the top end and the bottom end of the shell are respectively provided with a first air inlet (19) and a first air outlet (29); a motor supporting seat (25) and a supporting base (24) are respectively arranged at the bottom in the shell from bottom to top, the piston cavity (23) is arranged on the supporting base (24), a piston (20) is arranged in the piston cavity (23), the piston (20) is a revolving body with two thick ends and a thin middle part, the piston (20) can reciprocate up and down in the piston cavity (23), and in the reciprocating motion, the piston (20) and the inner wall of the piston cavity (23) form a sealed discharging cavity (21);
a feed pipe of the bin (27) is communicated with a feed port (28) of the piston cavity (23) through the shell so as to inject the proppant in the bin (27) into the discharge cavity (21);
linear motor (26) are installed to motor supporting seat (25), linear motor (26) with the bottom of piston (20) links to each other, works as when piston (20) downstream, the proppant in feed bin (27) can be injected into and is full of through feed inlet (28) in piston chamber (23) unloading chamber (21), works as when piston (20) upward movement and unloading chamber (21) interior proppant height are higher than the height in piston chamber (23), the proppant is dumped all around and gets into the high temperature high pressure gas homogeneous mixing in the casing from unloading chamber (21) top and from first air inlet (19).
2. Gas-solids mixing device according to claim 1, characterized in that the piston (20) is provided with sealing rubber rings (22) at both ends, respectively, to seal the discharge chamber (21) when proppant in the silo (27) is injected into the discharge chamber (21).
3. Gas-solids mixing device according to claim 2, characterized in that the height of the feed opening (28) is between the height of the sealing rubber rings (22) provided at both ends of the piston (20), respectively.
4. An apparatus for increasing the coal bed gas yield of a low-rank reservoir, the apparatus comprising: a gas supply tank (1), a gas pressurizing device (3), a gas-solid mixing device (5) according to any one of claims 1 to 3, and a gas-solid secondary mixing device (6);
the exhaust end of the gas supply tank (1) is connected with a volute gas inlet (14) of the gas pressurization device (3) through a first pipeline (2), a volute gas outlet (15) of the gas pressurization device (3) is connected with a gas inlet (19) of a gas-solid mixing device (5) through a second pipeline (4), and a gas outlet (29) of the gas-solid mixing device (5) is connected with a gas inlet (30) of the gas-solid secondary mixing device (6); and a second gas outlet (43) of the gas-solid secondary mixing device (6) is connected with the wellhead of the heat injection well (7).
5. The device according to claim 4, characterized in that it further comprises a display (8).
6. The device according to claim 4 or 5, characterized in that the gas-solid secondary mixing device (6) comprises a housing and a rotating shaft (36) arranged in the housing, a plurality of groups of rotating blades (37) are arranged on the rotating shaft (36), a second air inlet (30) and a second air outlet (43) are respectively arranged at the top end and the bottom end of the shell, a bearing support (39) is arranged at the bottom in the shell, a lower end bearing (38) is arranged at the central position of the bearing support (39), the top in the shell is provided with a motor stator (32) and a motor rotor (33), the motor stator (32) is sleeved outside the motor rotor (33), the bottom end of the rotating shaft (36) is connected with the lower end bearing (38), the top end of the rotating shaft (36) is connected with a counter bore in the center of the motor rotor (33) through a pressing ring (34).
7. The device according to claim 6, characterized in that the side wall of the housing is provided with a pressure relief opening (41), and the pressure relief opening (41) is provided with a pressure relief valve (42).
8. The device according to claim 6, characterized in that the lower end bearing (38) is fitted at its bottom with a lower end bearing clamping ring (40) for fixing the lower end bearing (38).
9. Device according to claim 6, characterized in that the top of the motor stator (32) is provided with a stator clamping ring (31).
10. The device according to claim 4 or 5, characterized in that said gas pressurization device (3) comprises: the device comprises a junction box (10), a volute casing (11), an impeller (13) arranged in the volute casing (11) and a rotating shaft (18); one end of the volute casing (11) is fixedly connected with the junction box (10), and the other end of the volute casing (11) is provided with a volute air inlet (14) and a volute air outlet (15); the volute casing (11) is internally and symmetrically provided with a first magnet (12) and a second magnet (17) which are opposite in magnetism, one end of the rotating shaft (18) is connected with the junction box (10) through a bearing, the other end of the rotating shaft is connected with the impeller (13), the rotating shaft (18) is provided with a rotor (16), and the rotor (16) is located between the first magnet (12) and the second magnet (17), so that the rotor (16) can rotate under the driving of Lorentz force generated by a magnetic field existing between the first magnet (12) and the second magnet (17) after the junction box (10) is electrified, and the rotating shaft (18) and the impeller (13) can be driven to rotate.
11. A method for improving the productivity of low-rank reservoir coalbed methane, which comprises the following steps by using the device for improving the productivity of low-rank reservoir coalbed methane of any one of claims 4 to 10:
(1) high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters an air boosting device to further increase the pressure of the high-temperature high-pressure hot air;
(2) the high-temperature high-pressure hot air pressurized in the step (1) enters a gas-solid mixing device to be uniformly mixed with a propping agent;
(3) the high-temperature high-pressure hot air mixed with the proppant obtained in the step (2) enters a gas-solid secondary mixing device, and the high-temperature high-pressure hot air and the proppant are more fully and uniformly mixed in the gas-solid secondary mixing device;
(4) and (4) injecting the high-temperature high-pressure hot air mixed with the proppant obtained in the step (3) into a heat injection well, and then mining the low-rank reservoir coal bed gas.
12. The method of claim 11, wherein during the production of the low-rank reservoir coal bed gas, the heat injection wells and the well heads of the production wells form a well pattern on the ground, and four production wells are uniformly distributed around one heat injection well in the well pattern.
13. The method according to claim 11 or 12, wherein step (1) comprises the specific steps of:
high-temperature high-pressure hot air discharged from the exhaust end of the air supply tank enters the air supercharging device through a volute air inlet of the air supercharging device, after a junction box of the air supercharging device is electrified, the impeller rotates at a high speed under the driving of the rotor and the rotating shaft, and after the impeller blades rotate and compress, the high-temperature high-pressure hot air realizes further supercharging.
14. The method according to claim 11 or 12, wherein step (2) comprises the specific steps of:
after the linear motor is electrified, the piston is driven to move downwards, so that the propping agent in the storage bin is injected through the feed inlet of the piston cavity and fills the unloading cavity, and the loading is finished;
after the feeding is finished, the linear motor is electrified to push the piston to move upwards, and when the height of the propping agent in the discharging cavity is higher than that of the piston cavity, the propping agent is dumped from the top of the discharging cavity to the periphery under the action of gravity and is uniformly mixed with high-temperature and high-pressure gas entering the shell of the gas-solid mixing device from the first gas inlet.
15. The method according to claim 11 or 12, wherein step (3) comprises the specific steps of:
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 driving of the motor rotor and the lower end bearing, the high-temperature high-pressure hot air is influenced by the high-speed rotation of the rotating blades to generate vortex, and the propping agent is further dispersed under the influence of the high-speed rotation and is more fully and uniformly mixed with the high-temperature high-pressure hot air.
16. The method according to claim 11 or 12, wherein in the step (3), when the gas pressure in the gas-solid secondary mixing device is too high, the method comprises: and opening a pressure reducing valve of the gas-solid secondary mixing device to discharge gas through a pressure relief opening until the gas pressure in the gas-solid secondary mixing device reaches a set value.
17. The method of claim 11 or 12, wherein the proppant comprises one or a combination of quartz sand, spherical ceramsite sand and sintered alumina.
CN202110196035.7A 2021-02-22 2021-02-22 Gas-solid mixing device, device and method for improving coalbed methane yield of low-order reservoir Active CN114961670B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4834783A (en) * 1988-05-09 1989-05-30 Consolidation Coal Company Rotary separator
CN106150450A (en) * 2016-07-13 2016-11-23 西南石油大学 A kind of horizontal gas well machine water-pumping/draining gas production system
CN109398780A (en) * 2018-10-23 2019-03-01 杭州中亚机械股份有限公司 A kind of filling apparatus
CN109707354A (en) * 2018-12-03 2019-05-03 中国石油集团川庆钻探工程有限公司 Downhole hydraulic pulsation nanometer increasing injection experimental provision and method
CN211598629U (en) * 2020-02-18 2020-09-29 陕西宏丰石油工程技术有限公司 Stirring conveyor is used in oil fracturing acidizing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4834783A (en) * 1988-05-09 1989-05-30 Consolidation Coal Company Rotary separator
CN106150450A (en) * 2016-07-13 2016-11-23 西南石油大学 A kind of horizontal gas well machine water-pumping/draining gas production system
CN109398780A (en) * 2018-10-23 2019-03-01 杭州中亚机械股份有限公司 A kind of filling apparatus
CN109707354A (en) * 2018-12-03 2019-05-03 中国石油集团川庆钻探工程有限公司 Downhole hydraulic pulsation nanometer increasing injection experimental provision and method
CN211598629U (en) * 2020-02-18 2020-09-29 陕西宏丰石油工程技术有限公司 Stirring conveyor is used in oil fracturing acidizing

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