CN114272777A - Two-phase jet mixing device and mixing method for realizing mixing of underground low-pressure gas - Google Patents
Two-phase jet mixing device and mixing method for realizing mixing of underground low-pressure gas Download PDFInfo
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- CN114272777A CN114272777A CN202111387119.5A CN202111387119A CN114272777A CN 114272777 A CN114272777 A CN 114272777A CN 202111387119 A CN202111387119 A CN 202111387119A CN 114272777 A CN114272777 A CN 114272777A
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Abstract
The invention provides a two-phase jet mixing device and a mixing method for realizing mixing of underground low-pressure gas, wherein the mixing device comprises a water delivery pump station, a high-pressure water pipeline, a Venturi pipeline and a gas-liquid two-phase water outlet pipeline which are sequentially communicated, and the Venturi pipeline is communicated with a compressed air pipeline. The invention can realize the application of the high-pressure gas-liquid two-phase jet technology in the underground without the help of a high-pressure gas pump station and a high-pressure gas tank, thereby greatly reducing the underground energy consumption and the danger of high-pressure gas. The quantity of the air input can be controlled by the number of the electromagnetic valve switches, so that the gas-liquid two-phase flow with different gas contents can be obtained, and selection is provided for different field conditions. The two-phase jet mixing device provided by the invention has the advantages of simple structure and convenience in installation, can obviously reduce the mixing pressure of gas and reduce energy consumption, and can realize the field application of underground high-pressure gas-liquid two-phase jet, thereby having great application prospect on the permeability increase of coal beds.
Description
Technical Field
The invention relates to the technical field of coal bed permeability improvement, in particular to a two-phase jet mixing device and a two-phase jet mixing method for realizing underground low-pressure gas mixing.
Background
Through development of many years, the water jet permeability increasing technology has remarkable effects in pressure relief and permeability increase of coal seams and gas extraction strengthening, and is widely applied to various large mining areas. However, the water jet permeability-increasing technology has the corresponding defects of large water consumption, high equipment pressure and water lock effect. In order to enhance the overall impact effect of the jet and improve the hydraulic rock breaking efficiency, high-efficiency jets represented by pulse jet, cavitation jet, abrasive jet and the like are generated in succession in the later stage of the 20 th century. On the basis of previous research, a forest Bo spring team provides a mode of forming high-pressure gas-liquid two-phase jet flow permeability increase by quantitative gas-phase mixing, and carries out preliminary experimental research. However, the conventional blender is found to have unstable threshold pressure of blending gas and too high gas pressure, so that the conventional blender is difficult to apply to special underground environments.
At present, gas-liquid two-phase jet flow is used as a new permeability-increasing technology, corresponding devices are not mature enough, and the underground application is limited to a certain extent. The principle of the high-pressure gas-liquid two-phase jet flow is that high-pressure gas is manually added and mixed with high-pressure water to form the high-pressure gas-liquid two-phase jet flow, and the high-pressure gas-liquid two-phase jet flow is sprayed out from a nozzle and then acts on coal to achieve the effect of increasing the permeability of a coal seam. In the process, high-pressure water can be provided through an underground pump station system, underground high-pressure gas is difficult to obtain, an electric pump is difficult to obtain underground safety marks, the pressurizing capacity of a pneumatic pump is limited, an underground high-pressure container belongs to a dangerous source and is difficult to obtain approval of a mine, and the application and development of gas-liquid two-phase jet flow are greatly limited.
Therefore, the patent provides a two-phase jet mixing device and a mixing method for mixing underground low-pressure gas, so as to solve the existing problems and enable high-pressure gas-liquid two-phase jet to play a role in permeability-increasing coal seams.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
The invention aims to provide a two-phase jet mixing device and a mixing method for realizing mixing of underground low-pressure gas, and aims to solve the problems that the threshold pressure of the mixed gas is unstable, the gas pressure is too high and the conventional mixer is difficult to apply to an underground special environment.
The embodiment of the first aspect of this application provides a realize double-phase efflux mixing device of low-pressure gas mixing, including the water delivery pump station that communicates in proper order, the high-pressure water pipeline, venturi type pipeline and the two-phase outlet conduit of gas-liquid, venturi type pipeline's choke section department is equipped with a plurality of air inlet, air inlet intercommunication compressed air pipeline, compressed air pipeline is including an inlet manifold and a plurality of branch pipe that communicate each other, the branch union coupling that admits air is between inlet manifold and choke section, every air inlet connection one admits air and is divided the pipe, every is admitted air and is divided the pipe and all is equipped with the solenoid valve.
In some embodiments, the venturi-type pipeline comprises a contraction section, a throat section and an expansion section which are communicated in sequence, wherein the contraction section is communicated with the high-pressure water pipeline, and the expansion section is communicated with the gas-liquid two-phase water outlet pipeline.
In some embodiments, the gas-liquid two-phase water outlet pipeline is provided with a pressure sensor and a gas content tester.
In some embodiments, the venturi-type pipeline includes a plurality of venturi-type pipeline units connected in series, two adjacent venturi-type pipeline units are in sealed communication, the throat section of each venturi-type pipeline unit is provided with an air inlet, and each air inlet is communicated with the compressed air pipeline.
In some embodiments, the air inlets of each venturi-type pipeline are distributed in a ring shape, and the air inlet main pipe is positioned in the central position of the air inlet branch pipe.
In some embodiments, the ratio of the tube diameter of the throat section to the maximum tube diameter of the venturi-type conduit is 0.1 to 0.5, the ratio of the tube diameter of the throat section to the tube length is 1:0.5 to 5, and the inlet angle of the convergent section is greater than the outlet angle of the divergent section.
In some embodiments, two adjacent Venturi type pipeline units are detachably connected through threads, and a sealing gasket is arranged at the joint.
In some embodiments, the venturi-type conduit is made of stainless steel.
The embodiment of the second aspect of the present application provides a two-phase jet blending method for realizing low-pressure gas blending, and the two-phase jet blending device for realizing downhole low-pressure gas blending, which is used for realizing downhole low-pressure gas blending, includes the following steps:
s1, checking the reliability of the compressed air pipeline and the high-pressure water pipeline, connecting the two-phase jet mixing device in the pipeline, and closing an electromagnetic valve of the compressed air pipeline to enable the compressed air pipeline to be in a closed state;
s2, starting a water delivery pump station, adjusting pressure and flow, and when the required pressure is reached, starting electromagnetic valves of a proper number of compressed air pipelines to introduce gas into the Venturi pipeline;
s3, observing the pressure sensor data and the gas content tester data of the gas-liquid two-phase water outlet pipeline, judging the mixing effect and the striking effect of the two-phase flow, and if the mixing effect and the striking effect do not meet the requirement, changing the number of opened electromagnetic valves or connecting a plurality of Venturi type pipelines in series for multi-stage mixing;
and S4, closing the electromagnetic valve and the water delivery pump station in sequence after the experiment is finished, opening a drainage valve connected with a gas-liquid two-phase water outlet pipeline, and discharging residual water in the pipeline for the next use.
In a third aspect of the present application, an application of the two-phase jet mixing device for realizing low-pressure gas mixing in downhole jet permeability increasing is provided.
The invention has the beneficial effects that:
(1) the invention can realize the application of the high-pressure gas-liquid two-phase jet technology in the underground without the help of a high-pressure gas pump station and a high-pressure gas tank, thereby greatly reducing the underground energy consumption and the danger of high-pressure gas.
(2) A plurality of blending threshold pressures can be realized by designing the Venturi type blender with different shrinkage ratios, and then jet flow parameters required by an underground field are obtained.
(3) The quantity of the air input can be controlled by the number of the electromagnetic valve switches, so that the gas-liquid two-phase flow with different gas contents can be obtained, and selection is provided for different field conditions.
(4) The gas-liquid two-phase jet flow monitoring system can monitor the mixing pressure and state of the two-phase flow in real time so as to adjust the mixing pressure and state according to the field condition.
(5) The two-phase jet mixing device provided by the invention has the advantages of simple structure and convenience in installation, can obviously reduce the mixing pressure of gas and reduce energy consumption, and can realize the field application of underground high-pressure gas-liquid two-phase jet, thereby having great application prospect on the permeability increase of coal beds.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent from and readily appreciated by reference to the following description of the embodiments taken in conjunction with the accompanying drawings,
wherein:
FIG. 1 is a schematic structural diagram of a two-phase jet blending device for achieving low-pressure downhole gas blending in an embodiment of the present application;
FIG. 2 is a distribution diagram of a plurality of air inlet branch pipes in a single compressed air pipeline;
FIG. 3 is a schematic view of a gassing control panel controlling a solenoid valve;
reference numerals:
1-a water delivery pump station; 2-high pressure water pipeline; 3-venturi type tubing; 31-a constriction; 32-throat section; 33-an expansion section; 4-an intake manifold; 5-air inlet branch pipe; 6-electromagnetic valve; 7-a pressure sensor; 8-gas-liquid two-phase water outlet pipeline; 9-gas content determinator; 10-a switch; 11-a work button; 12-scram button.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The two-phase jet mixing device and the mixing method for realizing low-pressure gas mixing in the well are described below with reference to the attached drawings.
As shown in fig. 1-3, an embodiment of the first aspect of the present application provides a two-phase jet mixing device for mixing downhole low-pressure gas, which includes a water delivery pump station 1 (i.e., a downhole water pump station in this embodiment), a high-pressure water pipeline 2, a venturi-type pipeline 3, and a gas-liquid two-phase water outlet pipeline 8, which are sequentially communicated, where the venturi-type pipeline 3 includes a contraction section 31, a throat section 32, and an expansion section 33, which are sequentially communicated, the contraction section 31 is communicated with the high-pressure water pipeline 2, and the expansion section 33 is communicated with the gas-liquid two-phase water outlet pipeline 8. The gas-liquid two-phase water outlet pipeline 8 is provided with a pressure sensor 7 and a gas content tester 9.
The pressure sensor is used for monitoring pressure data of the blended two-phase flow. The gas content tester is used for measuring the gas content and the mixing effect of the two-phase flow after mixing so as to adjust parameters according to the underground field condition.
In some embodiments, the venturi-type pipeline 3 includes several segments of venturi-type pipeline units connected in series, the venturi-type pipeline units can be detachably connected in series by using threads, two adjacent venturi-type pipeline units are in sealed communication, the sealing is preferably sealed by using a flat rubber gasket, and the pressure resistance can be 25 MPa. The throat section 32 of each venturi-type pipeline unit is provided with an air inlet, and each air inlet is communicated with a compressed air pipeline. The venturi-type piping units may be set in different numbers as needed. The venturi-type piping units can be selected from different sizes to be combined to achieve a desired blending effect.
In some embodiments, the inlets of each venturi-type conduit 3 are annularly distributed, as shown in fig. 2, with the inlet manifold 4 located at the upper end of the central position of the inlet manifold 5. The air pressure distribution is more symmetrical and uniform during ventilation.
In some embodiments, the ratio of the tube diameter of the throat section 32 to the maximum tube diameter of the venturi-type conduit 3 is 0.1 to 0.5, and the ratio of the tube diameter of the throat section 32 to the tube length is 1:0.5 to 5.
Through a comparison test, the ratio of the pipe diameter of the throat section 32 to the maximum pipe diameter of the venturi type pipeline 3 is set to 0.1, 0.2, 0.3, 0.4 and 0.5, respectively, and as the ratio of the pipe diameter of the throat section 32 to the maximum pipe diameter of the venturi type pipeline 3 increases, the cavitation area increases first and then decreases. The test results show that: the ratio of the pipe diameter of the throat pipe section 32 to the maximum pipe diameter of the Venturi type pipeline 3 is 0.3, the best effect is achieved, the cavitation area is the largest, the cavitation degree is the most intense, and the mixing effect of the compressed air pipeline is improved.
Through the comparative test, the ratio of the pipe diameter to the pipe length of the throat pipe section 32 is set as 1:0.5, 1: 1.0, 1: 2.0, 1: 2.5 and 1: 5.0, the ratio of the pipe diameter to the pipe length of the throat section 32 is increased, and the cavitation area is gradually increased. The test results show that: when the ratio of the pipe diameter to the pipe length is 1: at 0.5, the cavitation zone is greatest and the degree of cavitation is most intense.
Through comparative tests, simulations were performed with the inlet angles set to 11.3 °, 15.0 °, 21.8 °, 38.7 °, and 45.0 °, respectively, and the outlet angle set to 6.5 °, with the cavitation zone becoming progressively smaller as the inlet angle α increases. The test results show that: when the inlet angle alpha is 11.3 degrees, the cavitation area is the largest, the cavitation degree is the most intense, and the effect of properly reducing the inlet angle is better.
Through a comparative test, the outlet angles β were set to 5.1 °, 5.7 °, 6.5 °, 7.6 ° and 9.1 °, respectively, and the cavitation zone gradually became smaller as the outlet angle increased. The test results show that: when the outlet angle beta is 5.1 degrees, the cavitation area is the largest, the cavitation degree is more violent, and the cavitation phenomenon can be enhanced by properly reducing the outlet angle under the condition of meeting the cavitation occurrence. The inlet and outlet angles determine the length of the convergent 31 and divergent 33 sections.
Preferably, the inlet angle of the convergent section 31 is greater than the outlet angle of the divergent section 33, and the cavitation is more intense.
In some embodiments, the venturi-type conduit 3 is made of stainless steel. The material is not limited to stainless steel, and the pressure resistance and rust resistance can be ensured.
The embodiment of the second aspect of the present application provides a two-phase jet blending method for realizing downhole low-pressure gas blending, and the two-phase jet blending device for realizing downhole low-pressure gas blending, which includes the following steps:
s1, checking the reliability of the compressed air pipeline and the high-pressure water pipeline 2, connecting the two-phase jet mixing device in the pipeline, and closing the electromagnetic valve 6 of the compressed air pipeline to enable the compressed air pipeline to be in a closed state;
s2, starting the water delivery pump station 1, adjusting pressure and flow, and when the required pressure is reached, starting the electromagnetic valves 6 of the compressed air pipelines with proper quantity to introduce gas into the Venturi pipeline 3;
s3, observing the pressure sensor data and the gas content determinator data of the gas-liquid two-phase water outlet pipeline 8, judging the mixing effect and the striking effect of the two-phase flow, and if the mixing effect and the striking effect do not meet the requirement, changing the opening number of the electromagnetic valves 6 or connecting a plurality of Venturi type pipelines in series for multi-stage mixing;
and S4, after the experiment is finished, closing the electromagnetic valve 6 and the water delivery pump station 1 in sequence, opening a drainage valve connected with a gas-liquid two-phase water outlet pipeline 8, discharging residual water in the pipeline, preparing for jet flow anti-reflection of the next working surface, and circulating in sequence.
It should be noted that water in the low-lying part of the venturi-type pipeline can be pumped out by negative pressure or vented, and can be stored in the pipeline for a short time without treatment if the use is not influenced.
In a third aspect of the present application, an application of the two-phase jet mixing device for realizing low-pressure gas mixing in downhole jet permeability increasing is provided. The application can also be used in other fields.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a realize double-phase efflux mixing device of low-pressure gas mixing, a serial communication port, including the water delivery pump station that communicates in proper order, the high-pressure water pipeline, venturi tube way and the two-phase outlet pipe way of gas-liquid, venturi tube way department of venturi tube way is equipped with a plurality of air inlet, air inlet intercommunication compressed air pipeline, compressed air pipeline is including an inlet manifold and a plurality of branch pipe that admits air that communicate each other, the branch union coupling that admits air is between inlet manifold and venturi tube section, every air inlet is connected an admission and is divided the pipe, every admission is divided the pipe and all is equipped with the solenoid valve.
2. The two-phase jet mixing device for realizing low-pressure gas mixing of claim 1, wherein the Venturi type pipeline comprises a contraction section, a throat section and an expansion section which are communicated in sequence, the contraction section is communicated with the high-pressure water pipeline, and the expansion section is communicated with the gas-liquid two-phase water outlet pipeline.
3. The two-phase jet mixing device for realizing low-pressure gas mixing of claim 1, wherein a pressure sensor and a gas content tester are arranged on the gas-liquid two-phase water outlet pipeline.
4. The two-phase jet mixing device for realizing low-pressure gas mixing of claim 1, wherein the venturi-type pipeline comprises a plurality of venturi-type pipeline units connected in series, two adjacent venturi-type pipeline units are in sealed communication, and a throat section of each venturi-type pipeline unit is provided with an air inlet, and each air inlet is communicated with the compressed air pipeline.
5. The two-phase jet mixing device for mixing low-pressure gases according to claim 1, wherein the inlets of each venturi-type conduit are arranged in a ring shape, and the inlet manifold is located at the center of the inlet branch pipe.
6. The two-phase jet mixing device for realizing low-pressure gas mixing of claim 2, wherein the ratio of the pipe diameter of the throat section to the maximum pipe diameter of the Venturi type pipeline is 0.1-0.5, the ratio of the pipe diameter of the throat section to the pipe length is 1: 0.5-5, and the inlet angle of the contraction section is larger than the outlet angle of the expansion section.
7. The two-phase jet mixing device for mixing low-pressure gas according to claim 4, wherein two adjacent Venturi-type pipeline units are detachably connected through threads, and a sealing gasket is arranged at the joint.
8. The two-phase jet mixing device for achieving low pressure gas mixing of claim 1, wherein the venturi-type conduit is made of stainless steel.
9. A two-phase jet mixing method for realizing low-pressure gas mixing is characterized by comprising the following steps:
s1, checking the reliability of the compressed air pipeline and the high-pressure water pipeline, connecting the two-phase jet mixing device of any one of claims 1 to 8 in the pipeline, and closing an electromagnetic valve of the compressed air pipeline to enable the compressed air pipeline to be in a closed state;
s2, starting a water delivery pump station, adjusting pressure and flow, and when the required pressure is reached, starting electromagnetic valves of a proper number of compressed air pipelines to introduce gas into the Venturi pipeline;
s3, observing the pressure sensor data and the gas content tester data of the gas-liquid two-phase water outlet pipeline, judging the mixing effect and the striking effect of the two-phase flow, and if the mixing effect and the striking effect do not meet the requirement, changing the number of opened electromagnetic valves or connecting a plurality of Venturi type pipelines in series for multi-stage mixing;
and S4, closing the electromagnetic valve and the water delivery pump station in sequence after the experiment is finished, opening a drainage valve connected with a gas-liquid two-phase water outlet pipeline, and discharging residual water in the pipeline for the next use.
10. Use of a two-phase jet mixing device for achieving low pressure gas mixing as claimed in any of claims 1 to 8 for downhole jet antireflection.
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| CN114272777B (en) | 2023-03-28 |
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