CN210509765U - Recovery system utilizing residual pressure of high-pressure natural gas - Google Patents
Recovery system utilizing residual pressure of high-pressure natural gas Download PDFInfo
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- CN210509765U CN210509765U CN201921060193.4U CN201921060193U CN210509765U CN 210509765 U CN210509765 U CN 210509765U CN 201921060193 U CN201921060193 U CN 201921060193U CN 210509765 U CN210509765 U CN 210509765U
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Abstract
A recovery system utilizing residual pressure of high-pressure natural gas is mainly applied to natural gas gathering stations in China, and comprises a high-pressure gas well, a low-pressure gas well, a multi-injection-inlet ejector and a regulating valve; high-pressure gas of the high-pressure gas well enters the ejector, forms low-pressure high-speed airflow after passing through the high-pressure nozzle, and can inject the low-pressure gas to enter the ejector, so that the aim of recycling residual pressure of the high-pressure gas well is fulfilled; adopt the utility model discloses, through drawing many and penetrate the entry sprayer, when high-pressure gas well pressure was greater than the design value, the sprayer can be introduced simultaneously to many mouthfuls of low-pressure gas wells, effectively utilizes high-pressure gas well residual pressure to reach the purpose that increases and penetrate the effect. The computational result shows, adopts the utility model discloses can improve the recycle efficiency of high-pressure gas well residual pressure greatly, draw the injection ratio and increase more than 30%, have great energy-conserving benefit and social.
Description
Technical Field
The utility model relates to a natural gas exploitation field, the utility model particularly relates to an utilize high-pressure natural gas residual pressure recovery system to realize the abundant recovery of high-pressure gas well residual pressure in the gas collecting station.
Background
In the current domestic natural gas exploitation scheme, when a high-pressure gas well is normally produced, throttling and pressure reduction are needed to be carried out to output pressure, and energy of the high-pressure gas well is wasted on a throttling valve; a low-pressure gas well exists in the gas collecting station, and normal production cannot be realized due to the fact that the pressure of a pipeline of the low-pressure gas well is lower than the output pressure; on the one hand, the pressure of the high-pressure well is not fully utilized, and the compressor for driving the low-pressure natural gas production consumes additional energy. The utility model provides a high pressure natural gas residual pressure (pressure differential between high-pressure well and defeated pressure outward) recovery system and operation method thereof adopts and draws more and penetrate the entry sprayer, utilizes the energy of high-pressure gas well to produce gas pressurization with stranded low pressure gas well promptly, makes low pressure gas well produce gas pressure and reaches the requirement of producing gas defeated pressure outward to reach the energy of effectively utilizing high-pressure gas well, realize energy saving and consumption reduction's purpose.
Disclosure of Invention
In order to realize the abundant recycle of high-pressure gas well excess pressure in the gas collecting station, the utility model provides an utilize high-pressure natural gas excess pressure recovery system.
In order to realize the purpose, the utility model discloses a technical scheme is:
a recovery system utilizing the residual pressure of high-pressure natural gas comprises a high-pressure gas well A, wherein a gas inlet of the high-pressure gas well A is divided into two paths, one path is communicated with an inlet of a main mechanism 3 through a second regulating valve 2, and the other path is communicated with a working gas inlet of an ejector 4 through a first regulating valve 1;
the gas outlet of the first low-pressure gas well B is divided into two paths, one path of gas is communicated with the inlet of the main mechanism 3 through a fourth regulating valve 12, and the other path of gas is communicated with the injection inlet of the ejector 4 through a third regulating valve 11;
the gas outlet of the second low-pressure gas well C is divided into two paths, one path is communicated with the inlet of the main mechanism 3 through a sixth regulating valve 22, and the other path is communicated with the injection inlet of the ejector 4 through a fifth regulating valve 21;
the gas outlet of the third low-pressure gas well D is divided into two paths, one path is communicated with the inlet of the main mechanism 3 through an eighth regulating valve 32, and the other path is communicated with the injection inlet of the ejector 4 through a seventh regulating valve 31;
the outlet of the ejector 4 is connected with a main switch, the ejector 4 comprises a high-pressure nozzle 5, a mixing cavity throat part 6 and a diffusion chamber 7 which are sequentially communicated from the inlet to the outlet, and the ejector 4 is provided with a working fluid inlet 8 and three injection inlets.
The three injection inlets of the injector 4 are respectively a first injection inlet 9, a second injection inlet 10 and a third injection inlet 13, wherein the first injection inlet 9 is a main injection inlet and is positioned at the high-pressure nozzle 5, and the second injection inlet 10 and the third injection inlet 13 are auxiliary injection inlets; the second injection inlet 10 is positioned on the side wall of the throat part 6 of the mixing cavity, and the third injection inlet 13 is positioned on the side wall of the pressure expansion chamber 7.
And the low-pressure gas well entering the three injection inlets has pressure difference, wherein the low-pressure gas well with the highest pressure is communicated with the first injection inlet 9, the low-pressure gas well with the lowest pressure is communicated with the second injection inlet 10, and the gas well with the intermediate pressure is communicated with the third injection inlet 13.
When the operation method of the high-pressure natural gas residual pressure recovery system is used, the second regulating valve 2 on the pipeline of the high-pressure gas well A is closed, and the first regulating valve 1 is opened, so that high-pressure gas enters the ejector 4; in order to fully utilize the residual pressure of the high-pressure gas well, introducing a multi-port low-pressure gas well, firstly closing a first low-pressure gas well B, namely a fourth regulating valve 12 on a pipeline of the low-pressure gas well with the highest pressure, and opening a third regulating valve 11 of the first low-pressure gas well B, so that the incoming gas in the first low-pressure gas well B enters a first injection inlet 9; then, the sixth regulating valve 22 on the pipeline of the second low-pressure gas well C, namely the low-pressure gas well with the second highest pressure, is closed, and the fifth regulating valve 21 of the second low-pressure gas well C is opened, so that the incoming gas in the second low-pressure gas well C enters the second injection inlet 10; finally, closing the eighth regulating valve 32 on the third low-pressure gas well D, namely the low-pressure gas well pipeline with the lowest pressure, and opening the seventh regulating valve 31 of the third low-pressure gas well D, so that the incoming gas in the third low-pressure gas well D enters the third injection inlet 13; in the ejector 4, high-pressure gas is changed into high-speed gas flow through the high-pressure nozzle 5, the pressure of the high-pressure gas is reduced to form a low-pressure environment in the throat 6 of the mixing cavity, so that the low-pressure gas coming from the first injection inlet 9 can be injected, a series of shock waves and expansion waves can be generated when the two gas flows are mixed in the throat 6 of the mixing cavity, then the low-pressure gas enters the pressure expansion chamber 7, the speed of the mixed gas is reduced, the pressure of the mixed gas is increased, then the mixed gas flows out of the ejector 4 and enters the main engine 3, and finally the mixed gas; when the working pressure of the high-pressure gas is higher than the design pressure, the injection gas flow passage area is narrowed due to the expansion of the high-pressure gas, and the injection performance is reduced; however, in the throat 6 of the mixing cavity and the diffusion chamber 7, because of the existence of shock waves and expansion waves, a low-pressure area exists, and therefore the second injection inlet 10 and the third injection inlet 13 are arranged in the low-pressure areas of the two parts, the excess pressure of high-pressure gas can be effectively utilized, and the purpose of recovering the excess pressure of high-pressure natural gas is achieved; the positions of low-pressure areas in the throat part 6 of the mixing cavity and the diffusion chamber 7 are closely related to the high-pressure gas pressure, so whether the regulating valve is specifically opened or closed or not is determined by checking the change condition of the total flow, and after the related valve of the low-pressure gas well is opened, the total flow is increased, and the valve can be opened; if the total flow is reduced by opening the valve, the low pressure gas well needs to be shut down or the entry pressure of the high pressure gas well a needs to be increased.
Through the measures, the utility model discloses can effectively utilize high-pressure gas well residual pressure to realize the normal production of many mouthfuls of low pressure gas wells.
Compared with the prior art, the utility model has the advantages as follows:
(1) the energy-saving effect is great. High-pressure gas of high-pressure gas well gets into the sprayer, behind high-pressure nozzle, forms low pressure high-speed air current, can draw and penetrate low pressure gas and get into the sprayer, the utility model discloses the system can effectively improve the recycle efficiency of high-pressure gas well residual pressure, compares former sprayer technique, and it draws to penetrate to increase more than 30% under the variable operating mode condition, has great energy-conserving benefit and social.
(2) The adaptability to gas wells is good. Compared with the prior art, the utility model provides an in the system when high-pressure gas well pressure is greater than the design value, can introduce many mouthfuls of low pressure gas wells, realized high-pressure gas well excess pressure step utilization.
(3) The economic effect is good.
The utility model discloses the device is simple, and processing economy is convenient, and the operation is nimble reliable.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
Fig. 2 is a schematic diagram of a multiple injection inlet ejector.
The high-pressure gas well A, the first low-pressure gas well B, the second low-pressure gas well C, the third low-pressure gas well D, the first regulating valve 1, the second regulating valve 2, the third regulating valve 11, the fourth regulating valve 12, the fifth regulating valve 21, the sixth regulating valve 22, the seventh regulating valve 31 and the eighth regulating valve 32; the device comprises a main mechanism 3, an ejector 4, a high-pressure nozzle 5, a mixing cavity throat 6, a diffusion chamber 7, a working gas inlet 8, a first injection inlet 9, a second injection inlet 10 and a third injection inlet 13.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings and examples.
As shown in fig. 1, the utility model relates to an excess pressure recovery system using high-pressure natural gas, which comprises a high-pressure gas well a, wherein the gas coming from the high-pressure gas well a is divided into two paths, one path enters a main office 3 through a second regulating valve 2, and the other path enters a working gas inlet of an injector 4 through a first regulating valve 1; the gas coming from the first low-pressure gas well B is divided into two paths, one path enters the main mechanism 3 through a fourth regulating valve 12, and the other path enters an injection inlet of the ejector 4 through a third regulating valve 11; the gas coming from the second low-pressure gas well C is divided into two paths, one path enters the main mechanism 3 through a sixth regulating valve 22, and the other path enters an injection inlet of the injector 4 through a fifth regulating valve 21; the gas coming from the third low-pressure gas well D is divided into two paths, one path enters the main mechanism 3 through an eighth regulating valve 32, and the other path enters an injection inlet of the ejector 4 through a seventh regulating valve 31; the outlet of the ejector 4 is connected with a main switch.
As shown in fig. 2, the ejector 4 comprises a high-pressure nozzle 5, a mixing cavity throat 6 and a diffusion chamber 7 which are communicated in sequence from the inlet to the outlet, and the ejector 4 is provided with a working fluid inlet 8 and three injection inlets.
As shown in fig. 2, the three injection inlets of the injector 4 are respectively a first injection inlet 9, a second injection inlet 10 and a third injection inlet 13, wherein the first injection inlet 9 is a main injection inlet and is located at the high-pressure nozzle 5, and the second injection inlet 10 and the third injection inlet 13 are auxiliary injection inlets; the second injection inlet 10 is positioned on the side wall of the throat part 6 of the mixing cavity, and the third injection inlet 13 is positioned on the side wall of the pressure expansion chamber 7.
And the low-pressure gas well entering the three injection inlets has pressure difference, wherein the low-pressure gas well with the highest pressure is communicated with the first injection inlet 9, the low-pressure gas well with the lowest pressure is communicated with the second injection inlet 10, and the gas well with the intermediate pressure is communicated with the third injection inlet 13.
The utility model discloses the operation method of system as follows:
when the gas injection device works, the second regulating valve 2 on the pipeline of the high-pressure gas well A is closed, and the first regulating valve 1 is opened, so that high-pressure gas enters the injector 4; in order to fully utilize the residual pressure of the high-pressure gas well, a plurality of low-pressure gas wells can be introduced, firstly, the fourth regulating valve 12 on the pipeline of the first low-pressure gas well B (the low-pressure gas well with the highest pressure) is closed, and the third regulating valve 11 of the first low-pressure gas well B is opened, so that the incoming gas in the first low-pressure gas well B enters the first injection inlet 9; then, the sixth regulating valve 22 on the pipeline of the second low-pressure gas well C (the low-pressure gas well with the second highest pressure) is closed, and the fifth regulating valve 21 of the second low-pressure gas well C is opened, so that the incoming gas in the second low-pressure gas well C enters the second injection inlet 10; finally, the eighth regulating valve 32 on the pipeline of the third low-pressure gas well D (the low-pressure gas well with the lowest pressure) is closed, and the seventh regulating valve 31 of the third low-pressure gas well D is opened, so that the incoming gas in the third low-pressure gas well D enters the third injection inlet 13; high-pressure gas in the ejector 4 is changed into high-speed gas flow through the high-pressure nozzle 5, the pressure of the high-pressure gas is reduced to form a low-pressure environment at the throat 6 of the mixing cavity, so that the low-pressure gas coming from the first injection inlet 9 can be injected, a series of shock waves and expansion waves can be generated when the two gas flows are mixed in the throat 6 of the mixing cavity, then the low-pressure gas flows enter the pressure expansion chamber 7, the speed of the mixed gas is reduced, the pressure of the mixed gas is increased, then the mixed gas flows out of the ejector 4 and enters the main engine 3, and finally the; when the working pressure of the high-pressure gas is higher than the design pressure, the injection gas flow passage area is narrowed due to the expansion of the high-pressure gas, and the injection performance is reduced; however, in the throat 6 of the mixing cavity and the diffusion chamber 7, because of the existence of shock waves and expansion waves, a low-pressure area exists, and therefore the second injection inlet 10 and the third injection inlet 13 are arranged in the low-pressure areas of the two parts, the excess pressure of high-pressure gas can be effectively utilized, and the purpose of recovering the excess pressure of high-pressure natural gas is achieved; the positions of low-pressure areas in the throat part 6 of the mixing cavity and the diffusion chamber 7 are closely related to the high and low pressure of high-pressure gas, so whether the total flow is required to be checked for specific opening and closing is determined, and after the related valve of the low-pressure gas well is opened, the total flow is increased, and the valve can be opened; if the total flow is reduced by opening the valve, the well may need to be shut down or the pressure at the point of entry of the high pressure gas well a may need to be increased.
Claims (3)
1. The utility model provides an utilize high-pressure natural gas excess pressure recovery system which characterized in that: the gas inlet of the high-pressure gas well (A) is divided into two paths, one path is communicated with the inlet of a main mechanism (3) through a second regulating valve (2), and the other path is communicated with the working gas inlet of an ejector (4) through a first regulating valve (1);
the gas outlet of the first low-pressure gas well (B) is divided into two paths, one path of gas outlet is communicated with the inlet of the main valve (3) through a fourth regulating valve (12), and the other path of gas outlet is communicated with the injection inlet of the ejector (4) through a third regulating valve (11);
the gas outlet of the second low-pressure gas well (C) is divided into two paths, one path is communicated with the inlet of the main mechanism (3) through a sixth regulating valve (22), and the other path is communicated with the injection inlet of the injector (4) through a fifth regulating valve (21);
the gas outlet of the third low-pressure gas well (D) is divided into two paths, one path is communicated with the inlet of the main mechanism (3) through an eighth regulating valve (32), and the other path is communicated with the injection inlet of the ejector (4) through a seventh regulating valve (31);
the outlet of the ejector (4) is connected with the main engine, the ejector comprises a high-pressure nozzle (5), a mixing cavity throat part (6) and a diffusion chamber (7) which are sequentially communicated from the inlet to the outlet, and the ejector (4) is provided with a working fluid inlet (8) and three injection inlets.
2. The recovery system using residual pressure of high-pressure natural gas according to claim 1, wherein: the three injection inlets of the ejector (4) are respectively a first injection inlet (9), a second injection inlet (10) and a third injection inlet (13), wherein the first injection inlet (9) is a main injection inlet and is positioned at the high-pressure nozzle (5), and the second injection inlet (10) and the third injection inlet (13) are auxiliary injection inlets; the second injection inlet (10) is positioned on the side wall of the throat part (6) of the mixing cavity, and the third injection inlet (13) is positioned on the side wall of the pressure expansion chamber (7).
3. The recovery system using residual pressure of high-pressure natural gas according to claim 2, wherein: and the low-pressure gas well entering the three injection inlets has pressure difference, wherein the low-pressure gas well with the highest pressure is communicated with the first injection inlet (9), the low-pressure gas well with the lowest pressure is communicated with the second injection inlet (10), and the gas well with the intermediate pressure is communicated with the third injection inlet (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921060193.4U CN210509765U (en) | 2019-07-09 | 2019-07-09 | Recovery system utilizing residual pressure of high-pressure natural gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921060193.4U CN210509765U (en) | 2019-07-09 | 2019-07-09 | Recovery system utilizing residual pressure of high-pressure natural gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242623A (en) * | 2019-07-09 | 2019-09-17 | 西安交通大学 | It is a kind of to utilize high-pressure natural gas hydraulic recovery system and its operation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242623A (en) * | 2019-07-09 | 2019-09-17 | 西安交通大学 | It is a kind of to utilize high-pressure natural gas hydraulic recovery system and its operation method |
| CN110242623B (en) * | 2019-07-09 | 2023-08-01 | 西安交通大学 | System for recycling residual pressure of high-pressure natural gas and operation method thereof |
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