Double-high-pressure-well two-stage injection pressurization system

Abstract

The utility model discloses a double-high-pressure-well two-stage injection pressurization system, which belongs to the field of oil and gas exploitation and transportation and comprises a first-stage high-pressure gas inlet pipe, a second-stage high-pressure gas inlet pipe, a low-pressure gas inlet pipe, a first-stage medium-pressure exhaust pipe, a first-stage injection pressurization device, a second-stage injection pressurization device and a second-stage medium-pressure exhaust pipe. The first-stage injection supercharging device mixes low-pressure gas of the low-pressure gas inlet pipe and high-pressure gas of the first-stage high-pressure gas inlet pipe to form first-stage medium-pressure gas. High-pressure gas of the second-stage high-pressure gas inlet pipe and medium-pressure gas of the first-stage medium-pressure exhaust pipe are mixed by the second-stage injection supercharging device to form second-stage medium-pressure gas; and the second-stage medium-pressure gas is exhausted through a second-stage medium-pressure exhaust pipe. By adjusting a normal injection pressurization mode, the low-pressure gas of the low-pressure gas well can be pressurized to reach the pressure condition of a gathering and transportation pipe network by utilizing the high pressure of the two high-pressure gas wells and then output, so that the problem of gas well in-station production of different pressure systems is solved.

Description

Technical Field

[0001] The utility model belongs to the field of oil and gas exploitation and transportation, in particular to a two-stage injection boosting system for double high-pressure wells. Background Art

[0002] With the development of oil fields, the average wellhead pressure has been declining year by year, facing the problem of stopping spraying and the risk of being unable to enter the station. In the later stage of exploitation, there is also a situation where a large amount of low-pressure gas cannot enter the high-pressure valve group station, which affects the recoverable amount of natural gas, resulting in low-pressure wells with no production benefits, and a lot of manpower, material and financial resources are wasted. However, in oil and gas fields, the gas content of oil and gas is generally high, which threatens the operating reliability of conventional externally driven mixed transportation pumps and significantly increases the difficulty of pressurized transportation. Pumpless induced boosting technology overcomes the shortcomings of conventional externally driven mixed transportation pumps and provides a way for the mixed transportation of petroleum gas in low-pressure natural gas wells with high gas content.

[0003] In oil and gas fields, consider using high-pressure wells in the same block to boost the pressure of low-pressure wells by injection, so that they meet the relevant injection rate requirements and the outlet pressure needs to reach the specified pressure of the gathering pipeline, otherwise the gathering pipeline cannot transport the injected natural gas. The dual-high-pressure well two-stage injection boosting system produces gas through the first stage and then boosts the pressure through the second stage to obtain a higher exhaust pressure, so as to better meet the gathering and transportation requirements.

[0004] At present, a Chinese patent with the announcement number CN215979312U discloses a natural gas boosting system, which adopts a method of returning part of the gas pressurized by the first boosting device to the second boosting device to mix with the gas to be pressurized inside it. However, this system is only suitable for the high pressure stage of high pressure gas wells, and its application scope is relatively limited. There is a gap in the existing system of two-stage injection through dual high-pressure wells.

[0005] Therefore, it is necessary to develop a system that can increase the exhaust pressure to more easily achieve gathering and transportation conditions and enable low-pressure wells to obtain greater production benefits. Utility Model Content

[0006] In order to solve the problem that the pressure of low-pressure oil and gas wells cannot reach the pressure of the gathering and transportation pipeline network and to overcome the shortcomings of the existing injection boosting technology, the utility model proposes a two-stage injection boosting system for dual high-pressure wells. Through two-stage injection, the high-pressure oil and gas mixed medium is used to the greatest extent to inject and boost the low-pressure oil and gas mixed medium, thereby reducing the cost of oil and gas extraction and transportation.

[0007] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0008] A dual-high-pressure well two-stage ejection boosting system comprises a first-stage high-pressure intake pipe, a second-stage high-pressure intake pipe, a low-pressure intake pipe, a first-stage medium-pressure exhaust pipe, a first-stage ejection boosting device, a second-stage ejection boosting device and a second-stage medium-pressure exhaust pipe; the first-stage high-pressure intake pipe and the low-pressure intake pipe are connected to the first-stage ejection boosting device through pipelines respectively, the first-stage ejection boosting device is used for mixing the low-pressure gas of the low-pressure intake pipe and the high-pressure gas of the first-stage high-pressure intake pipe to form the first-stage medium-pressure gas; the second-stage high-pressure intake pipe is connected to the second-stage ejection boosting device through a pipeline, the first-stage ejection boosting device is connected to the second-stage medium-pressure exhaust pipe through the first-stage medium-pressure exhaust pipe, the second-stage ejection boosting device is used for mixing the high-pressure gas of the second-stage high-pressure intake pipe and the medium-pressure gas of the first-stage medium-pressure exhaust pipe to form the second-stage medium-pressure gas; the second-stage ejection boosting device is connected to the second-stage medium-pressure exhaust pipe through a pipeline, and the second-stage medium-pressure gas is discharged through the second-stage medium-pressure exhaust pipe.

[0009] Based on the above technical solution, further, the first-stage high-pressure air intake pipe is connected to a first high-pressure gas well arranged outside through a pipeline.

[0010] Based on the above technical solution, further, the second-stage high-pressure air intake pipe is connected to a second high-pressure gas well arranged outside through a pipeline, and the second high-pressure gas well and the first high-pressure gas well are different high-pressure gas wells.

[0011] Based on the above technical solution, further, the low-pressure air inlet pipe is connected to an externally arranged low-pressure air well through a pipeline.

[0012] Based on the above technical solution, further, a first flow meter is provided on the pipeline between the first-stage high-pressure intake pipe and the first-stage ejection supercharging device, and a first control valve is provided on the intake side pipeline of the first flow meter.

[0013] Based on the above technical solution, further, a first pressure gauge and a first thermometer are provided on the pipeline between the first flowmeter and the first-stage ejection booster device, the first pressure gauge is provided on the outlet side of the first flowmeter, and the first thermometer is provided between the first pressure gauge and the first-stage ejection booster device.

[0014] Based on the above technical solution, further, a second flow meter is provided on the pipeline between the low-pressure intake pipe and the first-stage ejection supercharging device, and a second control valve is provided on the intake side pipeline of the second flow meter.

[0015] Based on the above technical solution, further, a second pressure gauge and a second thermometer are provided on the pipeline between the second flowmeter and the first-stage ejection booster device, the second pressure gauge is provided on the outlet side of the second flowmeter, and the second thermometer is provided between the second pressure gauge and the first-stage ejection booster device.

[0016] Based on the above technical solution, further, a third flow meter is provided on the pipeline between the second-stage high-pressure intake pipe and the second-stage ejection supercharging device, and a third control valve is provided on the intake side pipeline of the third flow meter.

[0017] Based on the above technical solution, further, a third pressure gauge and a third thermometer are provided on the pipeline between the third flowmeter and the second-stage injection boosting device, the third pressure gauge is provided on the outlet side of the third flowmeter, and the third thermometer is provided between the third pressure gauge and the second-stage injection boosting device.

[0018] Based on the above technical solution, further, the first-stage ejection boosting device includes a first ejection boosting section and a first nozzle, and the first ejection boosting section is connected to the first nozzle.

[0019] Based on the above technical solution, further, the second-stage ejection boost device includes a second ejection boost section and a second nozzle, the second ejection boost section is connected to the second nozzle, and the first nozzle and the second ejection boost section are connected through a first-stage medium-pressure exhaust pipe.

[0020] Based on the above technical solution, further, a fourth control valve, a fourth pressure gauge and a fourth thermometer are arranged on the first-stage medium-pressure exhaust pipe, a fourth pressure gauge is arranged between the fourth thermometer and the first nozzle, and a fourth control valve is arranged between the fourth thermometer and the second injection boost section.

[0021] Based on the above technical solution, further, the second nozzle is connected to the second-stage medium-pressure exhaust pipe through a pipeline, and a fifth control valve, a fifth pressure gauge and a fifth thermometer are provided on the pipeline between the second nozzle and the second-stage medium-pressure exhaust pipe, a fifth pressure gauge is provided between the fifth thermometer and the second nozzle, and a fifth control valve is provided between the fifth thermometer and the exhaust port of the second-stage medium-pressure exhaust pipe.

[0022] Based on the above technical solution, further, the first ejection boost section and the second ejection boost section both include a mixing section and a diffuser section.

[0023] Compared with the prior art, the beneficial effects of the present invention are specifically embodied in:

[0024] (1) The dual high-pressure well two-stage injection boosting system of the utility model adjusts the normal injection boosting mode, adds a second-stage high-pressure air intake pipe and a second-stage injection boosting device, and utilizes the high pressure energy of the two high-pressure gas wells to boost the low-pressure gas of the low-pressure gas well to the pressure condition of the gathering and transportation pipeline network before external transmission, thereby solving the problem of gas wells with different pressure systems entering the station for production.

[0025] (2) The system of the utility model has the advantages of simple operation, energy saving and environmental protection, and does not require large-scale transformation of the existing system.

[0026] (3) The system of the utility model is suitable for the middle and late stages of gas field development, and utilizes the high pressure of newly developed wells to boost the pressure of old wells that have been developed for a long time, thereby achieving the purpose of energy conservation and in-station purification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the two-stage injection pressurization of double high-pressure wells of the utility model.

[0028] Figure numerals: 1. first-stage high-pressure intake pipe; 2. low-pressure intake pipe; 3. first-stage ejector booster; 4. first-stage medium-pressure exhaust pipe; 5. second-stage high-pressure intake pipe; 6. second-stage ejector booster; 7. flow meter; 8. pressure gauge; 9. thermometer; 10. second-stage medium-pressure exhaust pipe; 11. first ejector booster section; 12. first nozzle; 13. second ejector booster section; 14. second nozzle. DETAILED DESCRIPTION

[0029] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific implementations. The technical features of each implementation of the present invention can be combined accordingly without conflicting with each other.

[0030] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below. The technical features in each embodiment of the utility model can be combined accordingly without conflicting with each other.

[0031] In the description of the present utility model, it is necessary to understand that when an element is considered to be "connected" to another element, it can be directly connected to another element or indirectly connected, that is, there are intermediate elements. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0032] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0033] Example

[0034] Combination Figure 1As shown, the present embodiment provides a dual-high-pressure well two-stage injection boosting system, including a first-stage high-pressure air intake pipe 1, a second-stage high-pressure air intake pipe 5, a low-pressure air intake pipe 2, a first-stage medium-pressure exhaust pipe 4, a first-stage injection boosting device 3, a second-stage injection boosting device 6 and a second-stage medium-pressure exhaust pipe 710, wherein the first-stage high-pressure air intake pipe 1 is connected to an externally arranged first high-pressure gas well through a pipeline, which is used to transport the high-pressure gas produced by the first high-pressure gas well; the second-stage high-pressure air intake pipe 5 is connected to an externally arranged second high-pressure gas well through a pipeline, which is used to transport the high-pressure gas produced by the second high-pressure gas well, and the second high-pressure gas well and the first high-pressure gas well are different high-pressure gas wells independently arranged from each other; the low-pressure air intake pipe 2 is connected to an externally arranged low-pressure gas well through a pipeline, which is used to transport the low-pressure gas produced by the low-pressure gas well. Furthermore, the first-stage high-pressure intake pipe 1 and the low-pressure intake pipe 2 are connected to the first-stage ejection booster 3 through pipelines respectively, and the first-stage ejection booster 3 is used to mix the low-pressure gas of the low-pressure intake pipe 2 and the high-pressure gas of the first-stage high-pressure intake pipe 1 to form a first-stage medium-pressure gas; the second-stage high-pressure intake pipe 5 is connected to the second-stage ejection booster 6 through a pipeline, and the first-stage ejection booster 3 is connected to the second-stage medium-pressure exhaust pipe 4 through the first-stage medium-pressure exhaust pipe 4, and the second-stage ejection booster 6 is used to mix the high-pressure gas of the second-stage high-pressure intake pipe 5 and the medium-pressure gas of the first-stage medium-pressure exhaust pipe 4 to form a second-stage medium-pressure gas; the second-stage ejection booster 6 is connected to the second-stage medium-pressure exhaust pipe 710 through a pipeline, and the second-stage medium-pressure gas is discharged through the second-stage medium-pressure exhaust pipe 710.

[0035] Specifically, a first flowmeter is provided on the pipeline between the first-stage high-pressure intake pipe 1 and the first-stage ejection supercharging device 3, and a first control valve is provided on the intake side pipeline of the first flowmeter. A first pressure gauge and a first thermometer are provided on the pipeline between the first flowmeter and the first-stage ejection supercharging device 3, the first pressure gauge is provided on the outlet side of the first flowmeter, and the first thermometer is provided between the first pressure gauge and the first-stage ejection supercharging device 3. The first control valve is used to conduct or block the high-pressure gas in the first-stage high-pressure intake pipe 1; the first flowmeter is used to detect the flow parameters of the incoming gas in the first-stage high-pressure intake pipe 1; the first pressure gauge is used to detect the pressure parameters of the incoming gas in the first-stage high-pressure intake pipe 1; the first thermometer is used to detect the temperature parameters of the incoming gas in the first-stage high-pressure intake pipe 1.

[0036] A second flowmeter is provided on the pipeline between the low-pressure intake pipe 2 and the first-stage ejection supercharging device 3, and a second control valve is provided on the intake side pipeline of the second flowmeter. A second pressure gauge and a second thermometer are provided on the pipeline between the second flowmeter and the first-stage ejection supercharging device 3, the second pressure gauge is provided on the outlet side of the second flowmeter, and the second thermometer is provided between the second pressure gauge and the first-stage ejection supercharging device 3. The second control valve is used to conduct or block the low-pressure gas in the low-pressure intake pipe 2; the second flowmeter is used to detect the flow parameters of the incoming gas in the low-pressure intake pipe 2; the second pressure gauge is used to detect the pressure parameters of the incoming gas in the low-pressure intake pipe 2; and the second thermometer is used to detect the temperature parameters of the incoming gas in the low-pressure intake pipe 2.

[0037] A third flowmeter is provided on the pipeline between the second-stage high-pressure intake pipe 5 and the second-stage ejection supercharging device 6, and a third control valve is provided on the intake side pipeline of the third flowmeter. A third pressure gauge and a third thermometer are provided on the pipeline between the third flowmeter and the second-stage ejection supercharging device 6, the third pressure gauge is provided on the outlet side of the third flowmeter, and the third thermometer is provided between the third pressure gauge and the second-stage ejection supercharging device 6. The third control valve is used to conduct or block the high-pressure gas in the second-stage high-pressure intake pipe 5; the third flowmeter is used to detect the flow parameters of the incoming gas in the second-stage high-pressure intake pipe 5; the third pressure gauge is used to detect the pressure parameters of the incoming gas in the second-stage high-pressure intake pipe 5; and the third thermometer is used to detect the temperature parameters of the incoming gas in the low-pressure intake pipe 2.

[0038] The first-stage ejector boost device 3 includes a first ejector boost section 11 and a first nozzle 12, and the first ejector boost section 11 is connected to the first nozzle 12. The second-stage ejector boost device 6 includes a second ejector boost section 13 and a second nozzle 14, and the second ejector boost section 13 is connected to the second nozzle 14, and the first nozzle 12 is connected to the second ejector boost section 13 through the first-stage medium-pressure exhaust pipe 4, wherein the first-stage ejector boost device 3 and the second-stage ejector boost device 6 are existing devices, and their specific structures and working principles are not described in detail here; the first ejector boost section 11 and the second ejector boost section 13 both include a mixing section and a diffusion section. A fourth control valve, a fourth pressure gauge and a fourth thermometer are arranged on the first-stage medium-pressure exhaust pipe 4, a fourth pressure gauge is arranged between the fourth thermometer and the first nozzle 12, and a fourth control valve is arranged between the fourth thermometer and the second ejector boost section 13. Among them, the fourth control valve is used to conduct or block the medium-pressure gas in the first-stage medium-pressure exhaust pipe 4; the fourth pressure gauge is used to detect the pressure parameters of the incoming gas in the first-stage medium-pressure exhaust pipe 4; the fourth thermometer is used to detect the temperature parameters of the incoming gas in the first-stage medium-pressure exhaust pipe 4.

[0039] The second nozzle 14 is connected to the second-stage medium-pressure exhaust pipe 710 through a pipeline, and a fifth control valve, a fifth pressure gauge and a fifth thermometer are provided on the pipeline between the second nozzle 14 and the second-stage medium-pressure exhaust pipe 710. A fifth pressure gauge is provided between the fifth thermometer and the second nozzle 14, and a fifth control valve is provided between the fifth thermometer and the exhaust port of the second-stage medium-pressure exhaust pipe 710. The second control valve is used to conduct or block the medium-pressure gas in the second-stage medium-pressure exhaust pipe 710; the fifth pressure gauge is used to detect the pressure parameters of the incoming gas in the second-stage medium-pressure exhaust pipe 710; and the fifth thermometer is used to detect the temperature parameters of the incoming gas in the second-stage medium-pressure exhaust pipe 710.

[0040] The working principle of this system is as follows: the high-pressure gas from the first-stage high-pressure gas well enters the first-stage ejection booster device 3 through the first-stage high-pressure intake pipe 1, and after being ejected through the first nozzle 12, a high-speed low-pressure zone is formed on the gas outlet side of the first nozzle 12. The high-speed low-pressure zone sucks in the low-pressure gas in the low-pressure intake pipe 2, and then passes through the mixing section in the first ejection booster section 11 to form a mixed gas of the first-stage high-pressure gas and the low-pressure gas. The pressure of the mixed gas is then adjusted through the diffusion section in the first ejection booster section 11 to form a first-stage medium-pressure gas between the low-pressure gas and the first-stage high-pressure gas. Then, after being detected by the first flow meter, the first pressure gauge, and the first thermometer, the mixed gas enters the second-stage ejection booster device 6 through the first-stage medium-pressure exhaust pipe 4. The high-pressure gas from the second high-pressure gas well enters into the second-stage ejection booster device 6 through the second-stage high-pressure air inlet pipe 5, and after being ejected through the second nozzle 14, a high-speed low-pressure zone is formed on the gas outlet side of the second nozzle 14. The high-speed low-pressure zone sucks in the first-stage medium-pressure gas in the first-stage medium-pressure exhaust pipe 4, and then passes through the mixing section in the second ejection booster section 13 to form a mixed gas. The pressure of the mixed gas is then adjusted through the diffusion section in the second ejection booster section 13 to form a second-stage medium-pressure gas between the first-stage medium-pressure gas and the high-pressure gas of the second high-pressure gas well. Then, after being detected by the fifth pressure gauge and the fifth thermometer, the mixed gas is discharged to the external gathering pipeline through the second-stage medium-pressure exhaust pipe 710. Among them, the first pressure gauge, the second pressure gauge, the third pressure gauge, the fourth pressure gauge and the fifth pressure gauge can select the same pressure gauge 8; the first thermometer, the second thermometer, the third thermometer, the fourth thermometer and the fifth thermometer can select the same thermometer 9; the first flowmeter, the second flowmeter and the third flowmeter can select the same flowmeter 7; the first control valve, the second control valve, the third control valve, the fourth control valve and the first control valve can select the same control valve.

[0041] The above is only an implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A dual high-pressure well two-stage injection boosting system, characterized in that: It comprises a first-stage high-pressure air intake pipe (1), a second-stage high-pressure air intake pipe (5), a low-pressure air intake pipe (2), a first-stage medium-pressure exhaust pipe (4), a first-stage ejection supercharging device (3), a second-stage ejection supercharging device (6) and a second-stage medium-pressure exhaust pipe (10); The first-stage high-pressure air intake pipe (1) and the low-pressure air intake pipe (2) are respectively connected to the first-stage ejection booster device (3) through pipelines, and the first-stage ejection booster device (3) mixes the low-pressure air from the low-pressure air intake pipe (2) and the high-pressure air from the first-stage high-pressure air intake pipe (1) to form the first-stage intermediate-pressure air; The second-stage high-pressure intake pipe (5) is connected to the second-stage ejection booster (6) through a pipeline, and the first-stage ejection booster (3) is connected to the second-stage ejection booster (6) through the first-stage medium-pressure exhaust pipe (4). The second-stage ejection booster (6) mixes the high-pressure gas of the second-stage high-pressure intake pipe (5) and the medium-pressure gas of the first-stage medium-pressure exhaust pipe (4) to form the second-stage medium-pressure gas; The second-stage ejector pressurizing device (6) is connected to the second-stage medium-pressure exhaust pipe (10) through a pipeline, and the second-stage medium-pressure gas is discharged through the second-stage medium-pressure exhaust pipe (10).

2. A dual high-pressure well two-stage injection boosting system according to claim 1, characterized in that: The first-stage high-pressure air intake pipe (1) is connected to a first high-pressure air well arranged outside through a pipeline.

3. A dual high-pressure well two-stage injection boosting system according to claim 2, characterized in that: The second-stage high-pressure air inlet pipe (5) is connected to a second high-pressure air well arranged outside through a pipeline, and the second high-pressure air well and the first high-pressure air well are different high-pressure air wells.

4. A dual high-pressure well two-stage injection boosting system according to claim 1, characterized in that: The low-pressure air inlet pipe (2) is connected to an externally arranged low-pressure air well through a pipeline.

5. A dual high-pressure well two-stage injection boosting system according to claim 1, characterized in that: A first flow meter is provided on the pipeline between the first-stage high-pressure intake pipe (1) and the first-stage ejection supercharging device (3), and a first control valve is provided on the intake-side pipeline of the first flow meter.

6. A dual high-pressure well two-stage injection boosting system according to claim 5, characterized in that: A first pressure gauge and a first thermometer are provided on the pipeline between the first flow meter and the first-stage ejection booster (3); the first pressure gauge is provided on the gas outlet side of the first flow meter, and the first thermometer is provided between the first pressure gauge and the first-stage ejection booster (3).

7. The dual high-pressure well two-stage injection boosting system according to claim 1 is characterized in that: A second flow meter is provided on the pipeline between the low-pressure air intake pipe (2) and the first-stage ejection supercharging device (3), and a second control valve is provided on the air intake side pipeline of the second flow meter.

8. A dual high-pressure well two-stage injection boosting system according to claim 7, characterized in that: A second pressure gauge and a second thermometer are provided on the pipeline between the second flow meter and the first-stage ejection booster (3); the second pressure gauge is provided on the gas outlet side of the second flow meter, and the second thermometer is provided between the second pressure gauge and the first-stage ejection booster (3).

9. A dual high-pressure well two-stage injection boosting system according to claim 1, characterized in that: A third flow meter is provided on the pipeline between the second-stage high-pressure intake pipe (5) and the second-stage ejection supercharging device (6), and a third control valve is provided on the intake-side pipeline of the third flow meter.

10. A dual high-pressure well two-stage injection boosting system according to claim 9, characterized in that: A third pressure gauge and a third thermometer are provided on the pipeline between the third flow meter and the second-stage ejection booster (6); the third pressure gauge is provided on the gas outlet side of the third flow meter, and the third thermometer is provided between the third pressure gauge and the second-stage ejection booster (6).

11. A dual high-pressure well two-stage injection boosting system according to claim 1, characterized in that: The first-stage ejection boosting device (3) comprises a first ejection boosting section (11) and a first nozzle (12); the first ejection boosting section (11) is connected to the first nozzle (12).

12. A dual high-pressure well two-stage injection boosting system according to claim 11, characterized in that: The second-stage ejector boost device (6) comprises a second ejector boost section (13) and a second nozzle (14); the second ejector boost section (13) is connected to the second nozzle (14), and the first nozzle (12) is connected to the second ejector boost section (13) via a first-stage medium-pressure exhaust pipe (4).

13. A dual high-pressure well two-stage injection boosting system according to claim 12, characterized in that: A fourth control valve, a fourth pressure gauge and a fourth thermometer are arranged on the first-stage medium-pressure exhaust pipe (4); a fourth pressure gauge is arranged between the fourth thermometer and the first nozzle (12); and a fourth control valve is arranged between the fourth thermometer and the second ejection boosting section (13).

14. A dual high-pressure well two-stage injection boosting system according to claim 12, characterized in that: The second nozzle (14) is connected to the second-stage medium-pressure exhaust pipe (10) through a pipeline, and a fifth control valve, a fifth pressure gauge and a fifth thermometer are provided on the pipeline between the second nozzle (14) and the second-stage medium-pressure exhaust pipe (10), a fifth pressure gauge is provided between the fifth thermometer and the second nozzle (14), and a fifth control valve is provided between the fifth thermometer and the exhaust port of the second-stage medium-pressure exhaust pipe (10).

15. A dual high-pressure well two-stage injection boosting system according to claim 13 or 14, characterized in that: The first ejector boost section (11) and the second ejector boost section (13) both include a mixing section and a diffuser section.

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