CN205778833U - A carbon dioxide flooding gas injection well annulus test device with pressure - Google Patents

Abstract

The utility model discloses a carbon dioxide drives gas injection well annular space area pressure testing arrangement belongs to carbon dioxide and drives gas injection well oil jacket annular space test technical field. The test device includes: a gas processing control unit (1), a gas flow metering unit (2), a gas component detection unit (3) and a data processing unit (4); the gas inlet end of the gas treatment control unit (1) is connected with a large four-way joint of a carbon dioxide flooding gas injection well wellhead; the gas outlet end of the gas processing control unit (1) is divided into two branches, one branch is connected with the gas inlet end of the gas flow metering unit (2), and the other branch is connected with the gas inlet end of the gas component detection unit (3); the data processing unit (4) is electrically connected with the gas flow metering unit (2) and the gas component detection unit (3). The test device can quantitatively test the annulus pressure condition of the carbon dioxide flooding gas injection well, and the test result is accurate.

Description

A carbon dioxide flooding gas injection well annulus test device with pressure

technical field

The utility model relates to the technical field of testing the annulus of an oil casing of a carbon dioxide flooding gas injection well, in particular to a pressure testing device for the annular space of a carbon dioxide flooding gas injection well.

Background technique

Carbon dioxide flooding oil recovery technology is an oil recovery technology that injects carbon dioxide into oil reservoirs through gas injection wells and uses carbon dioxide to drive crude oil flow. During the process of injecting carbon dioxide into the reservoir, carbon dioxide will seep into the oil casing annulus of the gas injection well, which will increase the pressure of the oil casing annulus, resulting in the phenomenon of annular pressure. Annular pressure will increase the risk of safe operation of gas injection wells. Therefore, it is necessary to test the annular pressure of carbon dioxide flooding gas injection wells, that is, to test whether carbon dioxide leakage occurs, the reasons for carbon dioxide leakage, and the degree of carbon dioxide leakage, so as to provide a basis for formulating relevant prevention and control measures .

At present, the method of testing the pressure in the annular space of the carbon dioxide flooding gas injection well is: after the annular pressure is released, the annular pressure is measured with a pressure gauge, and the pressure in the annular space is judged according to the change of the annular pressure.

In the process of realizing the utility model, the designer found at least the following problems in the prior art: the existing method for testing the pressure in the annulus of the carbon dioxide flooding gas injection well can only qualitatively test the pressure in the annulus, and the test results are not accurate enough.

Utility model content

In order to solve the above technical problems, the utility model provides a carbon dioxide flooding gas injection well annular pressure testing device capable of quantitatively testing the annular pressure of the carbon dioxide flooding gas injection well.

Specifically, the following technical solutions are included:

A carbon dioxide flooding gas injection well annulus pressure test device, the test device includes:

Gas processing control unit, gas flow metering unit, gas component detection unit and data processing unit; the gas inlet end of the gas processing control unit is connected to the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well; the gas outlet end of the gas processing control unit It is divided into two branches, one branch is connected to the inlet end of the gas flow metering unit, and the other branch is connected to the inlet end of the gas component detection unit; the data processing unit is connected to the gas flow metering unit. The flow metering unit is electrically connected to the gas component detection unit; the gas processing control unit is used to decompress and filter the annular gas from the carbon dioxide flooding gas injection well; the gas flow metering unit is used to The flow rate of the annular gas is detected; the gas component detection unit is used to detect the composition of the annular gas; the data processing unit is used to detect the ambient The flow rate of the air and the composition of the annular gas detected by the gas component detection unit are used to determine the annular pressure of the carbon dioxide flooding gas injection well.

Further, the gas treatment control unit includes a first decompression device, a tee, a second decompression device, and a dehumidification filter device; The gas outlet of the first decompression device is connected to one interface of the three-way, and the other two interfaces of the three-way are respectively connected to the inlet end of the gas flow metering unit and the second pressure-reducing device. The air inlet of the pressure reducing device is connected; the air outlet of the second decompression device is connected with the air inlet of the dehumidification filter device; the air outlet of the dehumidification filter device is connected with the air inlet of the gas component detection unit connect.

Further, the gas treatment control unit further includes: a first box; the first box is provided with an air inlet, a first gas outlet and a second gas outlet; the first decompression device, a tee , the second decompression device and the dehumidification and filtering device are arranged in the first box; the air inlet of the first decompression device is connected to the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well through the air inlet of the first box connection; the tee is connected to the inlet end of the gas flow metering unit through the first gas outlet of the first box; the gas outlet of the dehumidification filter device is connected through the second outlet of the first box The gas port is connected with the gas inlet end of the gas component detection unit.

Further, the gas flow metering unit includes: a pressure compensation device, a flow meter, and a temperature compensation device; the flow meter is electrically connected to the data processing unit; the air inlet of the flow meter is connected to the first box connected to the first air outlet.

Further, the gas flow metering unit further includes: a second box body; an air inlet and an exhaust port are arranged on the second box body; the pressure compensation device, the flow meter and the temperature compensation device are arranged on the In the second box; the air inlet of the flowmeter is connected with the first air outlet of the first box through the air inlet of the second box; the air outlet of the flowmeter is connected with the second air outlet Exhaust port connection of the box.

Further, the gas component detection unit includes an oxygen detector, a hydrogen sulfide detector, a carbon dioxide detector and a data collector; the oxygen detector, hydrogen sulfide detector and carbon dioxide detector are electrically connected to the data collector ; The data collector is electrically connected to the data processing unit.

Further, the gas component detection unit also includes: a third box body; an air inlet and an exhaust port are arranged on the third box body; the oxygen detector, hydrogen sulfide detector, carbon dioxide detector and The data collector is arranged in the third box; the air inlet of the third box is connected with the second air outlet of the first box.

Further, the air inlet of the first box is connected to the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well through a gas connection pipeline.

Further, ground anchors are arranged on the gas connection pipeline.

Further, an exhaust gas collection device is provided at the exhaust port of the second box body and the exhaust port of the third box body.

The beneficial effect of the technical scheme that the utility model embodiment provides is:

In the carbon dioxide flooding gas injection well annulus pressure test device provided by the embodiment of the utility model, after the annular gas from the carbon dioxide flooding gas injection well is decompressed and filtered by the gas treatment control unit, a part of the annular gas enters the gas flow metering unit , another part of the annular gas enters the gas component detection unit. The gas flow metering unit detects the flow rate of the surrounding air, and the gas component detecting unit detects the composition of the surrounding air. The gas flow metering unit and the gas component detection unit respectively transmit the detection results to the data processing unit, and the data processing unit judges the pressure of the annular space according to the flow change and composition of the annular gas. The test device provided by the embodiment of the utility model realizes the quantitative test of the pressure in the annulus of the carbon dioxide flooding gas injection well through the dynamic monitoring of the flow rate and composition of the annular gas in the casing annular pressure release process of the carbon dioxide flooding gas injection well, and analyzes the environmental conditions. The cause of the empty belt pressure, the degree of leakage judgment, and the test result are accurate.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic structural view of a carbon dioxide flooding gas injection well annulus pressure testing device provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the gas processing control unit in the annulus pressure test device of the carbon dioxide flooding gas injection well provided by the embodiment of the utility model;

Fig. 3 is a structural schematic diagram of the gas flow metering unit in the annulus pressure test device of the carbon dioxide flooding gas injection well provided by the embodiment of the utility model;

Fig. 4 is the front view of the gas component detection unit in the annulus pressure testing device of the carbon dioxide flooding gas injection well provided by the embodiment of the utility model;

Fig. 5 is a rear view of the gas component detection unit in the annulus pressure testing device for carbon dioxide flooding gas injection well provided by the embodiment of the present utility model.

The reference signs in the figure represent respectively:

1 - Gas treatment control unit;

11-the air inlet of the first box; 12-the first air outlet of the first box;

13-the second air outlet of the first box; 14-the first decompression device; 15-the second decompression device;

16-dehumidification filter device; 17-tee; 18-first box;

2- gas flow metering unit;

21-the air inlet of the second box body; 22-the exhaust port of the second box body; 23-pressure compensation device;

24-flowmeter; 25-temperature compensation device; 26-second box; 27-handle;

3- Gas component detection unit;

31-the air inlet of the third box; 32-the exhaust port of the third box; 33-oxygen detector;

34-hydrogen sulfide detector; 35-carbon dioxide detector; 36-data collector; 37-third box;

4 - data processing unit;

5- Exhaust gas collection device;

6- gas connection pipeline;

7- Ground anchor.

detailed description

In order to make the technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.

The embodiment of the utility model provides a carbon dioxide drive gas injection well annulus test device with pressure, see Figure 1, the test device includes: gas processing control unit 1, gas flow metering unit 2, gas component detection unit 3 and data processing Unit 4.

The gas inlet end of the gas processing control unit 1 is connected to the large four-way wellhead of the carbon dioxide flooding gas injection well; the gas outlet end of the gas processing control unit 1 is divided into two branches, and one branch is connected to the inlet end of the gas flow metering unit 2. The other branch is connected to the gas inlet end of the gas component detection unit 3 .

The data processing unit 4 is electrically connected with the gas flow metering unit 2 and the gas component detection unit 3 .

The gas treatment control unit 1 is used to depressurize and filter the annular gas from the carbon dioxide flooding gas injection well; the gas flow metering unit 2 is used to detect the flow rate of the annular gas; the gas component detection unit 3 is used to monitor the The composition of the air is detected; the data processing unit 4 is used to analyze the annulus of the carbon dioxide flooding gas injection well according to the flow rate of the annular gas detected by the gas flow metering unit 2 and the composition of the annular gas detected by the gas component detection unit 3. Judgment on the pressure situation.

In the carbon dioxide flooding gas injection well annulus pressure test device provided by the embodiment of the utility model, after the annular gas from the carbon dioxide flooding gas injection well is decompressed and filtered by the gas treatment control unit 1, a part of the annular gas enters the gas flow measurement Unit 2, another part of the ambient gas enters the gas component detection unit 3. The gas flow metering unit 2 detects the flow rate of the surrounding air, and the gas component detecting unit 3 detects the composition of the surrounding air. The gas flow measurement unit 2 and the gas component detection unit 3 respectively transmit the detection results to the data processing unit 4, and the data processing unit 4 judges the pressure of the annular space according to the flow change and composition of the annular gas. The test device provided by the embodiment of the utility model realizes the quantitative test of the pressure in the annulus of the carbon dioxide flooding gas injection well through the dynamic monitoring of the flow rate and composition of the annular gas in the casing annular pressure release process of the carbon dioxide flooding gas injection well, and analyzes the environmental conditions. The cause of the empty belt pressure, the degree of leakage judgment, and the test result are accurate.

The B-B Test annular pressure diagnosis method commonly used in this field can be used for reference to judge the annular pressure situation according to the flow change and composition of the annular gas.

Further, referring to FIG. 2 , in the above testing device, the gas treatment control unit 1 includes a first decompression device 14 , a tee 17 , a second decompression device 15 and a dehumidification filter device 16 . The air inlet of the first decompression device 14 is connected to the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well; The air inlet of the flow metering unit 2 is connected to the air inlet of the second decompression device 15 . The gas outlet of the second decompression device 15 is connected to the air inlet of the dehumidification filter device 16 ; the gas outlet of the dehumidification filter device 16 is connected to the air inlet of the gas component detection unit 3 . The annular air first passes through the first decompression device 14 for the first decompression, so that the pressure of the annular air drops below a certain value (for example, below 4MPa); the annular air after the first decompression passes through the tee 17 Finally, it is divided into two parts, one part enters the gas flow metering unit 2 for flow detection, and the other part passes through the second decompression device 15 to further reduce the pressure (for example, to 0.2MPa), and passes through the dehumidification filter device 16 to remove impurities and then enters the gas group The sub-detection unit 3 performs component detection. The specific forms of the first decompression device 14 , the second decompression device 15 and the dehumidification and filtration device 16 are not strictly limited, and conventional technical means in the field can be used.

Further, referring to FIG. 2 , in the above test device, in order to facilitate the installation of the gas treatment control unit 1 at the site of the carbon dioxide flooding gas injection well, the gas treatment control unit 1 is also provided with a first box 18 . The first box body 18 is provided with an air inlet 11 , a first air outlet 12 and a second air outlet 13 . The above-mentioned first decompression device 14 , tee 17 , second decompression device 15 and dehumidification filter device 16 are all arranged in the first box body 18 . The air inlet of the first decompression device 14 is connected with the large four-way port of the wellhead of the carbon dioxide flooding gas injection well through the air inlet 11 of the first box body 18, that is, the large four-way port of the wellhead of the carbon dioxide flooding gas injection well and the air intake of the first box body 18 The port 11 and the air inlet of the first decompression device 14 are connected in sequence. The tee 17 is connected to the inlet end of the gas flow metering unit 2 through the first gas outlet 12 of the first box body 18 . The air outlet of the dehumidification filter device 16 is connected to the air inlet of the gas component detection unit 3 through the second air outlet 13 of the first box 18 .

Those skilled in the art can understand that a valve can be provided between the tee 17 and the second decompression device 15 to control the ratio of the ambient air entering the gas flow metering unit 2 and the gas component detection unit 3 . A pressure sensor can also be arranged near the air inlet of the first decompression device 14 to detect the pressure of the surrounding air, and the pressure sensor is electrically connected to the data processing unit 4 to transmit the detected pressure of the surrounding air to the data The processing unit 4 cooperates with parameters such as the flow rate and composition of the annular gas to further improve the accuracy of the annular pressure test.

Further, referring to FIG. 3 , in the above testing device, the gas flow metering unit 2 includes: a pressure compensating device 23 , a flow meter 24 and a temperature compensating device 25 . The air inlet of the flow meter 24 is connected with the first air outlet 12 of the first box 18 . The flow meter 24 is electrically connected to the data processing unit 4 . The annular gas from the gas treatment control unit 1 passes through the flow meter 24 , and the flow meter 24 detects the flow rate of the passing annular gas, and transmits the detection result to the data processing unit 4 . Wherein, the pressure compensating device 23 and the temperature compensating device 25 are arranged at positions close to the gas inlet and the gas outlet of the flow meter 24 respectively, to compensate the pressure and temperature, so as to make the detection result more accurate.

Further, referring to FIG. 3 , in the above test device, in order to facilitate the installation of the gas flow metering unit 2 at the site of the carbon dioxide flooding gas injection well, the gas flow metering unit 2 is provided with a second box 26 . The second casing 26 is provided with an air inlet 21 and an air outlet 22. The above-mentioned pressure compensating device 23 , flow meter 24 and temperature compensating device 25 are arranged in the second box body 26 . The air inlet of the flow meter 24 is connected with the first air outlet 12 of the first box 18 through the air inlet 21 of the second box 26 . The air outlet of the flow meter 24 is connected with the exhaust port 22 of the second box body 26 . A handle 27 is also provided on the second box body 26 to further facilitate the installation and movement of the gas flow metering unit 2 .

Further, for the annular gas of the carbon dioxide flooding gas injection well, its possible components include oxygen, hydrogen sulfide and carbon dioxide, therefore, the gas component detection unit 3 should at least be able to detect the content of oxygen, hydrogen sulfide and carbon dioxide . Based on this, referring to FIG. 4 in combination with FIG. 5 , in the above test device, the gas component detection unit 3 includes an oxygen detector 33 , a hydrogen sulfide detector 34 , a carbon dioxide detector 35 and a data collector 36 . The oxygen detector 33 , the hydrogen sulfide detector 34 and the carbon dioxide detector 35 are electrically connected to the data collector 36 . The data collector 36 is electrically connected to the data processing unit 4 . The data collector 36 collects the detection results of the oxygen detector 33 , the hydrogen sulfide detector 34 and the carbon dioxide detector 35 , and transmits the detection results to the data processing unit 4 . Those skilled in the art can understand that, through the detection of hydrogen sulfide and carbon dioxide in the annular air, in addition to improving the accuracy of the annular pressure test, it is also possible to analyze the corrosion of the annular space, and provide support for the environmental protection of the annular space. Corrosion provides data.

Similarly, referring to FIG. 4 in combination with FIG. 5 , in order to facilitate the installation of the gas component detection unit 3 , the gas component detection unit 3 is also provided with a third box 37 . The third box body 37 is provided with an air inlet 31 and an air outlet 32 . An oxygen detector 33 , a hydrogen sulfide detector 34 , a carbon dioxide detector 35 and a data collector 36 are arranged in the third box 37 . The air inlet 31 of the third box 37 is connected with the second air outlet 13 of the first box 18 . The oxygen detector 33, the hydrogen sulfide detector 34 and the carbon dioxide detector 35 can be arranged in series, and the ambient air enters the oxygen detector 33, the hydrogen sulfide detector 34 and the carbon dioxide detector in sequence after passing through the air inlet 31 of the third box 37 35. Detect the oxygen content, hydrogen sulfide content and carbon dioxide content in the ambient air.

Further, referring to FIG. 1 , in the above test device, the gas inlet 11 of the first box body 18 is connected to the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well through the gas connection pipeline 6 . In order to ensure that the gas connection pipeline 6 remains stable during the operation of the test device, the gas connection pipeline 6 is also provided with a ground anchor 7 .

Further, referring to FIG. 1 , in the above test device, in order to prevent the environment from being polluted by the direct discharge of the surrounding air, the exhaust port 22 of the second box body 26 and the exhaust port 32 of the third box body 37 are all provided with Exhaust gas collecting device 5 is arranged. The specific form of the exhaust gas collection device 5 is not particularly limited in the embodiment of the utility model, and any exhaust gas collection device commonly used in the field can be used.

Further, the data processing unit in the embodiment of the present invention may include any device with functions of data calculation, processing, analysis, and storage, such as a notebook computer, a desktop computer, and a tablet computer.

The working principle of the carbon dioxide flooding gas injection well annulus pressure test device provided by the embodiment of the utility model is to open the large four-way valve of the carbon dioxide flooding gas injection well, and the annular gas in the annulus of the carbon dioxide flooding gas injection well passes through the gas connection pipeline 6 and then passes through the first The air inlet 11 of a box body 18 enters the gas treatment control unit 1, and in the gas treatment control unit 1, the first decompression is performed through the first decompression device 14, so that the pressure of the surrounding air drops below a certain value (eg below 4MPa). After the first decompression, the annular air passes through the tee 17 and is divided into two parts: one part is output from the first gas outlet 12 of the first box 18, and then enters the gas flow through the air inlet of the second box 26 Metering unit 2, the flow meter 24 of gas flow metering unit 2 carries out real-time dynamic detection to the flow rate of the surrounding air, and the data obtained by detection is transmitted to the data processing unit 4; the other part further reduces the pressure through the second decompression device 15 (for example down to 0.2MPa), and after the dehumidification filter device 16 removes impurities, it is output by the second gas outlet 13 of the first box body 18, and then enters the gas component detection unit 3 through the air inlet of the third box body 37, and the gas component The oxygen detector 33, hydrogen sulfide detector 34 and carbon dioxide detector 35 of the sub-detection unit 3 detect the oxygen content, hydrogen sulfide content and carbon dioxide content in the ambient air respectively, and the data collector 36 collects the above-mentioned oxygen content, hydrogen sulfide content and carbon dioxide content data and transmitted to the data processing unit 4. The exhaust gases from the gas flow metering unit 2 and the gas component detection unit 3 are discharged from the exhaust port 22 of the second box body 26 and the exhaust port 32 of the third box body 37 respectively, and then enter the exhaust gas collection device 5 . The data processing unit 4 judges the annular pressure of the carbon dioxide flooding gas injection well according to the flow data and composition data of the annular gas.

Taking the test data of Hei 79-1# carbon dioxide flooding gas injection well in Jilin Oilfield as an example, the working principle of the test device provided by the embodiment of the utility model is further explained. The annular gas flow rate data detected by the gas flow metering unit 2 shows that, within the test period, after the annular pressure is released, the annular gas flow rate gradually decreases until the annular pressure drops to 0 MPa. After 15 days, the annular gas flow rate The flow rate gradually increased again; the ambient air composition data detected by the gas composition detection unit 3 showed that the annular air contained carbon dioxide gas and a small amount of hydrogen sulfide gas. Based on the above data, and according to the BB Test annular pressure diagnosis method, it is judged that the annular pressure phenomenon occurs in Well Hei 79-1#, and the annular pressure is caused by the micro-seepage of the wellbore tubing or packer, which belongs to level II Low risk, continuous observation should be maintained. At the same time, due to the existence of carbon dioxide and hydrogen sulfide in the annular gas, and the annular protection fluid used in Well Hei 79-1# is a water-based protection fluid, the coexistence of water-based protection fluid with carbon dioxide and hydrogen sulfide gas may easily cause corrosion of the pipe string, so It is necessary to add a fungicide to the annular space protection solution, and at the same time add a desulfurizer to remove the original S ^2- in the annular space solution, so as to avoid the stress corrosion environment caused by the existence of SRB (sulfate reducing bacteria).

In summary, the carbon dioxide flooding gas injection well annular pressure test device provided by the embodiment of the utility model dynamically monitors the flow rate and composition of the annular air gas during the pressure release process of the carbon dioxide flooding gas injection well oil casing annular space, and cooperates with the B-B Test annular space Pressure diagnosis method and related software calculation methods can effectively analyze the cause of pressure in the annular space of carbon dioxide flooding gas injection wells, and judge the main leakage location and leakage degree, so as to take corresponding control measures to reduce the safety hazards caused by the pressure in the annular space , and finally achieve the purpose of safe gas injection. At the same time, according to the composition of the surrounding air, the corrosion factors of the wellbore are analyzed to provide a basis for the formulation of anti-corrosion measures.

The above description is only for those skilled in the art to understand the technical solution of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. A carbon dioxide flooding gas injection well annulus test device with pressure, is characterized in that, said test device comprises: A gas processing control unit (1), a gas flow metering unit (2), a gas component detection unit (3) and a data processing unit (4); The gas inlet end of the gas processing control unit (1) is connected to the large four-way wellhead of the carbon dioxide flooding gas injection well; the gas outlet end of the gas processing control unit (1) is divided into two branches, and one branch is connected to the gas injection well. The inlet end of the flow measurement unit (2) is connected, and another branch is connected with the inlet end of the gas component detection unit (3); The data processing unit (4) is electrically connected to the gas flow metering unit (2) and the gas component detection unit (3); The gas treatment control unit (1) is used to decompress and filter the annular gas from the carbon dioxide flooding gas injection well; The gas flow metering unit (2) is used to detect the flow rate of the annular gas; The gas composition detection unit (3) is used to detect the composition of the annular air; The data processing unit (4) is used to obtain the flow rate of the annular air detected by the gas flow metering unit (2) and the flow rate of the annular air detected by the gas component detection unit (3). The composition judges the annular pressure of the carbon dioxide flooding gas injection well. 2. The testing device according to claim 1, characterized in that, the gas treatment control unit (1) comprises a first decompression device (14), a tee (17), a second decompression device (15) and Dehumidification filter device (16); The air inlet of the first decompression device (14) is connected with the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well; the gas outlet of the first decompression device (14) is connected with one of the three connections (17) Interface connection, the other two interfaces of the tee (17) are respectively connected with the air inlet of the gas flow metering unit (2) and the air inlet of the second decompression device (15); The gas outlet of the second decompression device (15) is connected with the air inlet of the dehumidification filter device (16); the gas outlet of the dehumidification filter device (16) is connected with the gas component detection unit (3) air inlet connection. 3. The test device according to claim 2, characterized in that, the gas treatment control unit (1) further comprises: a first box body (18); the first box body (18) is provided with an air inlet Port (11), first air outlet (12) and second air outlet (13); The first decompression device (14), tee (17), second decompression device (15) and dehumidification filter device (16) are arranged in the first box (18); The air inlet of the first decompression device (14) is connected with the large four-way connection of the wellhead of the carbon dioxide flooding gas injection well through the air inlet (11) of the first casing (18); The tee (17) is connected to the inlet end of the gas flow metering unit (2) through the first air outlet (12) of the first box body (18); the dehumidification filter device (16) The gas outlet is connected to the gas inlet end of the gas component detection unit (3) through the second gas outlet (13) of the first box (18). 4. The test device according to claim 3, characterized in that, the gas flow metering unit (2) comprises: a pressure compensation device (23), a flow meter (24) and a temperature compensation device (25); the flow rate The meter (24) is electrically connected to the data processing unit (4); The air inlet of the flow meter (24) is connected with the first air outlet (12) of the first box (18). 5. The test device according to claim 4, characterized in that, the gas flow metering unit (2) also comprises: a second box body (26); the second box body (26) is provided with an air inlet Port (21) and exhaust port (22); The pressure compensating device (23), the flow meter (24) and the temperature compensating device (25) are arranged in the second box (26); The air inlet of the flowmeter (24) is connected with the first air outlet (12) of the first casing (18) through the air inlet (21) of the second casing (26); The air outlet of the flow meter (24) is connected with the air outlet (22) of the second box (26). 6. test device according to claim 5, is characterized in that, described gas composition detection unit (3) comprises oxygen detector (33), hydrogen sulfide detector (34), carbon dioxide detector (35) and data Collector (36); Described oxygen detector (33), hydrogen sulfide detector (34) and carbon dioxide detector (35) are electrically connected with described data collector (36); The data collector (36) is electrically connected to the data processing unit (4). 7. The test device according to claim 6, characterized in that, the gas component detection unit (3) also comprises: a third casing (37); the third casing (37) is provided with Air port (31) and exhaust port (32); The oxygen detector (33), hydrogen sulfide detector (34), carbon dioxide detector (35) and data collector (36) are arranged in the third box (37); The air inlet (31) of the third box (37) is connected with the second air outlet (13) of the first box (18). 8. The test device according to claim 3, characterized in that, the air inlet (11) of the first casing (18) is connected to the large cross-connection of the wellhead of the carbon dioxide flooding gas injection well through a gas connection pipeline (6) connect. 9. The test device according to claim 8, characterized in that, the gas connection pipeline (6) is provided with a ground anchor (7). 10. The test device according to claim 7, characterized in that, at the exhaust port (22) of the second box body (26) and at the exhaust port (32) of the third box body (37) Exhaust gas collecting devices (5) are arranged at each place.