CN116591668A - Flow data acquisition device of gas production wellhead - Google Patents
Flow data acquisition device of gas production wellhead Download PDFInfo
- Publication number
- CN116591668A CN116591668A CN202310885933.2A CN202310885933A CN116591668A CN 116591668 A CN116591668 A CN 116591668A CN 202310885933 A CN202310885933 A CN 202310885933A CN 116591668 A CN116591668 A CN 116591668A
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- sealing
- air guide
- gas
- data acquisition
- flow data
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000011521 glass Substances 0.000 claims abstract description 22
- 210000001503 joint Anatomy 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 102
- 238000005070 sampling Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010992 reflux Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 74
- 238000013480 data collection Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Geophysics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a flow data acquisition device of a gas production wellhead, which relates to the field of gas production and comprises a flow acquisition tube seat, wherein butt joint discs are welded at the front end and the rear end of the flow acquisition tube seat, a data machine box is fixedly arranged on one side of the flow acquisition tube seat, a display panel is arranged on one side of the data machine box, an introduction joint is fixedly arranged at the upper end of the data machine box, and a rotor mounting column is arranged in the flow acquisition tube seat. According to the flow data acquisition device of the gas production wellhead, disclosed by the invention, the gas after the flow data acquisition is discharged, so that the gas is conveniently led out and used, the gas is conveniently refluxed, the gas is conveniently subjected to quality analysis and detection, the gas is stored in a glass bottle for acquisition, the gas is sampled when the gas is refluxed for quality detection, the gas is stored for a period of time after the flow data acquisition, and the discharge valve is opened for reflux during detection, so that the gas is more convenient to compare and detect.
Description
Technical Field
The invention relates to the field of gas production, in particular to a flow data acquisition device of a gas production wellhead.
Background
The utility model provides a flow data collection system of gas production well head is the device that the gas flow data of gas production was detected when the well head was adopted gas, can implement the flow data of detection gas, the data statistics of cooperation gas production uses, by wide application in the well head gas production of natural gas, current flow data collection system of gas production well head is when using, mainly by the rotation of gas drive blade and rotor, the acquisition of gas flow data is realized to the rethread speed of calculating, consequently, in order not to influence the flow of gas, the device has adopted totally enclosed structure to lead gas, but totally enclosed structure can't discharge gas, when the gas quality of detection and exhaust gas collection need, can't directly exhaust on the device, inconvenient gaseous derivation is used, also inconvenient gaseous carries out mass analysis and detects the use, simultaneously when needs sampling, totally enclosed structure can not carry out gas collection, just can carry out gas sampling after the flow data collection needs, consequently, the mismatching of sampling gas and flow detection gas has been led, inconvenient gaseous sampling detects the use.
Disclosure of Invention
The invention mainly aims to provide a flow data acquisition device of a gas production wellhead, which can effectively solve the technical problems of the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a flow data acquisition device of gas production well head, includes the circulation collection tube socket, the equal welding of circulation collection tube socket front end and rear end has the butt joint dish, one side fixed mounting of circulation collection tube socket has the data machine box, one side of data machine box is equipped with display panel, the upper end fixed mounting of data machine box has the leading-in joint, be equipped with the rotor erection column in the circulation collection tube socket, the one end movable mounting of rotor erection column has the rotor post, the outside fixed mounting of rotor post has a plurality of rotor blade, the upper end fixed mounting of circulation collection tube socket has the air guide footstock, the both sides of air guide footstock all fixed mounting has the air guide sealed lid, one side fixed mounting of air guide sealed lid has the exhaust valve pipe, the one end screw thread of exhaust valve pipe installs the exhaust pipe, the lower extreme of exhaust pipe is equipped with sampling structure with the upper end of leading-in joint, the upper end movable mounting of air guide footstock has rotatory handle, the inside top movable mounting of air guide footstock has the lift screw, the outside screw thread of lift installs the sealed footstock, the sealed valve plate is fixed from the inside of air guide footstock has the sealed under the valve plate.
As a further scheme of the invention, the rotor mounting column penetrates through the circulation collection tube seat to be fixedly connected with the data box, and the rotor column and the rotor blades are positioned in front of the inner center of the circulation collection tube seat.
As a further scheme of the invention, the sampling structure comprises a glass bottle, an air guide connector, a mounting rotating shaft, a rotating shaft torsion spring, a sealing plate and a bevel board, wherein the glass bottle is positioned between a discharge pipeline and an introduction connector, the two air guide connectors are fixedly arranged at the upper end and the lower end of the glass bottle, the two mounting rotating shafts are respectively arranged at one side of the inner part of the two air guide connectors, the rotating shaft torsion spring is clamped at the outer side of the mounting rotating shaft, the sealing plate is fixedly arranged at one side of the mounting rotating shaft, and the bevel board is fixedly arranged at the outer side of the sealing plate.
As a further scheme of the invention, the exhaust pipeline and the leading-in connector are respectively inserted into the two air guide connectors, the exhaust pipeline and the leading-in connector are in fit connection with the inclined panel, the sealing plate rotates around one side of the air guide connector through the installation rotating shaft, and one end of the rotating shaft torsion spring is fixedly connected with the inside of the air guide connector.
As a further scheme of the invention, the discharge valve pipe is arranged on the air guide sealing cover on one side in a threaded manner, the sealing plug is arranged on the air guide sealing cover on the other side in a threaded manner, and the discharge valve pipe is in through connection with the inside of the air guide top seat through the air guide sealing cover.
As a further scheme of the invention, the sealing valve plate rotates around the lifting screw rod to lift, the sealing ring is sleeved on the outer side of the sealing valve plate, and the sealing valve plate is in fit connection with the inner wall of the air guide top seat through the sealing ring.
As a further scheme of the invention, the self-sealing structure comprises a mounting frame, a guide rail rod, a pressing spring, a lifting sleeve, a connecting frame and a self-sealing air bag, wherein the mounting frame is fixedly arranged on the inner wall of the air guide footstock, the guide rail rod is fixedly arranged at the lower end of the mounting frame, the pressing spring and the lifting sleeve are sleeved on the outer side of the guide rail rod, the pressing spring is positioned above the lifting sleeve, the connecting frame is fixedly arranged on the outer side of the lifting sleeve, and the self-sealing air bag is fixedly arranged on the outer sides of the connecting frame and the lifting sleeve.
As a further scheme of the invention, the upper end of the downward-pressing spring is connected with the mounting frame in a fitting way, the lifting sleeve surrounds the guide rail rod to lift and move, and the mounting frame and the connecting frame are in a cross-shaped structural design.
As a further scheme of the invention, the lifting screw is in fit connection with the upper end of the mounting frame, the sealing ring is embedded into the circulation collection tube seat, the self-sealing air bag is of a hollow semicircular structure design, and the self-sealing air bag is in fit connection with the inner wall of the sealing ring.
Compared with the prior art, the invention has the following beneficial effects: the gas after flow collection flows into the gas guide top seat through the gas flow gas guide top seat, and then is discharged through the discharge valve pipe and the sealing plug on the gas guide sealing covers at the two sides, and the gas after flow data collection is discharged, so that the gas is conveniently discharged and used;
the gas can flow downwards through the exhaust pipeline at the lower end of the exhaust valve pipe and then pass through the glass bottle to enter the data box from the guide joint, and the data box performs mass analysis and detection on the gas, so that the gas can flow back, and the mass analysis and detection of the gas are facilitated;
the glass bottle can be quickly arranged between the exhaust pipeline and the leading-in connector for fixing through the sampling structure, so that the gas can pass through the glass bottle, meanwhile, the gas can be observed, the glass bottle can be quickly separated from the exhaust pipeline and the leading-in connector and sealed, the gas is stored in the glass bottle for collection, and the gas is sampled when the gas flows back for quality detection;
through the continuous collection of air guide roof seat to gas, in the gaseous sustainable entering air guide roof seat, the gaseous capacity upper limit in the air guide roof seat drives the self-sealing gasbag again and moves down and expand, makes self-sealing gasbag and sealing ring laminating seal the air guide roof seat, consequently preserve the gas in a period after the flow data acquisition, opens the exhaust valve pipe again and flows back when detecting, more makes things convenient for gaseous contrast to detect and uses.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a flow data acquisition device of a gas production wellhead;
FIG. 2 is a split view of a sampling structure in a flow data acquisition device of a gas production wellhead according to the present invention;
FIG. 3 is a schematic diagram of a sampling structure in a flow data acquisition device of a gas production wellhead according to the present invention;
FIG. 4 is a schematic diagram of a flow-through collection header and a gas-guiding header in a flow data collection device for a gas production wellhead according to the present invention;
FIG. 5 is a diagram of the structure of the gas production wellhead after the self-sealing structure is sealed;
fig. 6 is a schematic diagram of a self-sealing structure in a flow data acquisition device of a gas production wellhead according to the present invention.
In the figure: 1. a flow-through collection tube holder; 2. a butt joint disc; 3. a data set box; 4. a display panel; 5. a lead-in connector; 6. a rotor mounting post; 7. a rotor column; 8. a rotor blade; 9. an air guide top seat; 10. an air guide sealing cover; 11. a discharge valve tube; 12. a discharge pipe; 13. a sampling structure; 14. rotating the handle; 15. lifting screw rods; 16. a sealing valve plate; 17. a self-sealing structure; 18. a seal ring; 19. sealing the plugs; 31. a glass bottle; 32. an air guide joint; 33. installing a rotating shaft; 34. a rotating shaft torsion spring; 35. a sealing plate; 36. a bevel panel; 71. a mounting frame; 72. a guide rail rod; 73. pressing down the spring; 74. a lifting sleeve; 75. a connecting frame; 76. a self-sealing air bag.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1-6, a flow data acquisition device of a gas production wellhead comprises a flow acquisition tube seat 1, wherein a butt joint disc 2 is welded at the front end and the rear end of the flow acquisition tube seat 1, a data box 3 is fixedly installed at one side of the flow acquisition tube seat 1, a display panel 4 is arranged at one side of the data box 3, a guide joint 5 is fixedly installed at the upper end of the data box 3, a rotor mounting column 6 is arranged in the flow acquisition tube seat 1, a rotor column 7 is movably installed at one end of the rotor mounting column 6, a plurality of rotor blades 8 are fixedly installed at the outer side of the rotor column 7, a gas guide top seat 9 is fixedly installed at the upper end of the flow acquisition tube seat 1, gas guide sealing covers 10 are fixedly installed at two sides of the gas guide top seat 9, a discharge valve pipe 11 is fixedly installed at one side of the gas guide sealing covers 10, a discharge pipe 12 is installed at one end screw thread of the discharge valve pipe 11, a sampling structure 13 is arranged at the lower end of the discharge pipe 12 and the upper end of the guide joint 5, a rotary handle 14 is movably installed at the upper end of the gas guide top seat 9, a lifting screw 15 is movably installed at the upper part of the inside of the gas guide top seat 9, a sealing ring 16 is integrally installed at the lower end of the gas guide top seat 9, and a sealing ring 18 is fixedly installed at the lower end of the gas sealing seat 18.
In this embodiment, the rotor mounting post 6 is fixedly connected to the data box 3 through the flow collection tube holder 1, the rotor post 7 and the rotor blade 8 are located at positions forward of the inner center of the flow collection tube holder 1, and rotation data of the rotor post 7 and the rotor blade 8 are transmitted to the data box 3 through the rotor mounting post 6.
In this embodiment, the sampling structure 13 includes a glass bottle 31, an air guide joint 32, a mounting rotating shaft 33, a rotating shaft torsion spring 34, a sealing plate 35 and a bevel board 36, the glass bottle 31 is located between the discharge pipe 12 and the lead-in joint 5, the two air guide joints 32 are fixedly mounted at the upper end and the lower end of the glass bottle 31, the two mounting rotating shafts 33 are respectively mounted at one side of the inner parts of the two air guide joints 32, the rotating shaft torsion spring 34 is clamped at the outer side of the mounting rotating shaft 33, the sealing plate 35 is fixedly mounted at one side of the mounting rotating shaft 33, the bevel board 36 is fixedly mounted at the outer side of the sealing plate 35, the discharge pipe 12 and the lead-in joint 5 are respectively inserted into the inner parts of the two air guide joints 32, the discharge pipe 12 and the lead-in joint 5 are in joint connection with the bevel board 36, the sealing plate 35 rotates around one side of the air guide joint 32 through the mounting rotating shaft 33, one end of the rotating shaft torsion spring 34 is fixedly connected with the inner part of the air guide joint 32, and the mounting rotating shaft torsion spring 34 is utilized to drive the mounting rotating shaft 33 to always maintain the rotating force of the air guide joint 32.
In this embodiment, the exhaust valve pipe 11 is screwed on the air guide sealing cover 10 on one side, the sealing plug 19 is screwed on the air guide sealing cover 10 on the other side, the exhaust valve pipe 11 is connected with the inside of the air guide top seat 9 through the air guide sealing cover 10, and the sealing plug 19 plays a role in sealing the air guide sealing cover 10.
In this embodiment, the sealing valve plate 16 rotates around the lifting screw 15 to lift, the sealing ring is sleeved on the outer side of the sealing valve plate 16, the sealing valve plate 16 is attached to the inner wall of the air guide top seat 9 through the sealing ring, and the lifting of the sealing valve plate 16 can seal and open the air guide top seat 9, so that the air guide top seat 9 can control the discharge of air.
In this embodiment, the self-sealing structure 17 includes a mounting frame 71, a guide rail rod 72, a pressing spring 73, a lifting sleeve 74, a connecting frame 75 and a self-sealing air bag 76, the mounting frame 71 is fixedly mounted on the inner wall of the air guide top seat 9, the guide rail rod 72 is fixedly mounted at the lower end of the mounting frame 71, the pressing spring 73 and the lifting sleeve 74 are sleeved on the outer side of the guide rail rod 72, the pressing spring 73 is located above the lifting sleeve 74, the connecting frame 75 is fixedly mounted on the outer side of the lifting sleeve 74, the self-sealing air bag 76 is fixedly mounted on the outer side of the connecting frame 75 and the lifting sleeve 74, the upper end of the pressing spring 73 is attached to the mounting frame 71, the lifting sleeve 74 is lifted and movable around the guide rail rod 72, the mounting frame 71 and the connecting frame 75 are in cross-shaped structure design, and the lifting sleeve 74 plays a role in movably mounting the self-sealing air bag 76.
In this embodiment, the lifting screw 15 is attached to the upper end of the mounting frame 71, the sealing ring 18 is embedded into the circulation collection tube seat 1, the self-sealing air bag 76 is of a hollow semicircular structure design, the self-sealing air bag 76 is attached to the inner wall of the sealing ring 18, and the self-sealing air bag 76 and the sealing ring 18 are connected to perform a sealing function.
When the flow data acquisition device is used, the front end and the rear end of the flow acquisition tube seat 1 are in butt joint installation with a pipeline of the gas production well head through the butt joint disc 2, so that gas enters the flow acquisition tube seat 1 to circulate, the rotor blades 8 and the rotor columns 7 are blown to rotate by utilizing the circulation of the gas, and the speed of the rotation of the rotor columns 7 is calculated by the data box 3 to obtain flow data of the gas and display the flow data on the display panel 4;
through the gas flow gas guide top seat 9, the gas which passes through flows into the flow collection tube seat 1 and simultaneously flows into the gas guide top seat 9, then flows into the discharge valve tube 11 and the discharge pipeline 12 from the gas guide sealing cover 10, then flows into the data box 3 from the lead-in connector 5 through the glass bottle 31, and is subjected to quality analysis and detection by the data box 3;
when the glass bottle 31 is not installed, the sealing plate 35 seals the air guide joint 32, when the glass bottle 31 is installed, the air guide joint 32 at the upper end and the lower end is inserted into the port of the exhaust pipeline 12 and the air guide joint 5 to be connected, meanwhile, the port of the exhaust pipeline 12 and the port of the air guide joint 5 are extruded to form a bevel panel 36, the bevel panel 36 drives the sealing plate 35 to rotate around the installation rotating shaft 33, the sealing is further opened, so that the air can enter from above the glass bottle 31 and then is discharged from below, and when the glass bottle 31 is pulled out, the air guide joint 32 is separated from the exhaust pipeline 12 and the air guide joint 5, and meanwhile, the rotating shaft torsion spring 34 drives the installation rotating shaft 33 to reversely rotate, so that the sealing plate 35 is driven to rotate to be attached to the air guide joint 32 to be sealed, and the air can be stored in the glass bottle 31 to be collected;
through the continuous collection of gas to the air guide top seat 9, certain atmospheric pressure has when gas gets into in the air guide top seat 9, therefore gas upwards extrudees self-sealing gasbag 76, make self-sealing gasbag 76 upwards move around guide rail rod 72 through lift sleeve 74, and shrink, simultaneously gas passes self-sealing gasbag 76 and gets into in the air guide top seat 9, and then when the gas volume in the air guide top seat 9 is upper limit, gas just can not get into in the air guide top seat 9, move lift sleeve 74 downwardly moving by pushing down spring 73, and then make self-sealing gasbag 76 downwardly moving, gas in the air guide top seat 9 also reverse gets into self-sealing gasbag 76 simultaneously, prop up self-sealing gasbag 76, make self-sealing gasbag 76 laminate with sealing ring 18 and seal air guide top seat 9, gas preservation in a period has just been realized.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a flow data acquisition device of gas production well head which characterized in that: including circulation collection tube seat (1), the butt joint dish (2) has all been welded to circulation collection tube seat (1) front end and rear end, one side fixed mounting of circulation collection tube seat (1) has data machine box (3), one side of data machine box (3) is equipped with display panel (4), the upper end fixed mounting of data machine box (3) has leading-in joint (5), be equipped with rotor erection column (6) in circulation collection tube seat (1), rotor erection column (6)'s one end movable mounting has rotor column (7), rotor column (7)'s outside fixed mounting has a plurality of rotor blade (8), the upper end fixed mounting of circulation collection tube seat (1) has air guide top seat (9), the both sides of air guide top seat (9) all fixed mounting has air guide seal lid (10), one side fixed mounting of air guide seal lid (10) has discharge valve pipe (11), the one end screw thread of discharge pipe (12) installs, the lower extreme of discharge pipe (12) and leading-in joint (5) have guide screw rod (13) on the movable mounting screw rod (15) on the air guide top seat (9), the sealing valve plate (16) is installed on the outer side threads of the lifting screw (15), the self-sealing structure (17) is fixedly installed below the inside of the air guide top seat (9), and the sealing ring (18) is integrally formed at the lower end of the air guide top seat (9).
2. The flow data acquisition device of a gas production wellhead according to claim 1, wherein: the rotor mounting column (6) penetrates through the circulation collection tube seat (1) to be fixedly connected with the data machine box (3), and the rotor column (7) and the rotor blades (8) are located at the position, close to the front, of the inner center of the circulation collection tube seat (1).
3. The flow data acquisition device of a gas production wellhead according to claim 1, wherein: the sampling structure (13) comprises a glass bottle (31), an air guide connector (32), an installation rotating shaft (33), a rotating shaft torsion spring (34), a sealing plate (35) and an inclined plate (36), wherein the glass bottle (31) is positioned between a discharge pipeline (12) and a guide-in connector (5), the two air guide connectors (32) are fixedly arranged at the upper end and the lower end of the glass bottle (31), the two installation rotating shafts (33) are respectively arranged on one side of the inner part of the two air guide connectors (32), the rotating shaft torsion spring (34) is clamped on the outer side of the installation rotating shaft (33), the sealing plate (35) is fixedly arranged on one side of the installation rotating shaft (33), and the inclined plate (36) is fixedly arranged on the outer side of the sealing plate (35).
4. A flow data acquisition device for a gas production wellhead according to claim 3, wherein: the exhaust pipeline (12) and the leading-in connector (5) are respectively inserted into the two air guide connectors (32), the exhaust pipeline (12) and the leading-in connector (5) are connected with the inclined panel (36) in a fitting mode, the sealing plate (35) rotates around one side of the air guide connectors (32) through the installation rotating shaft (33), and one end of the rotating shaft torsion spring (34) is fixedly connected with the inside of the air guide connectors (32).
5. The flow data acquisition device of a gas production wellhead according to claim 1, wherein: the exhaust valve pipe (11) is arranged on the air guide sealing cover (10) on one side in a threaded manner, the sealing plug (19) is arranged on the air guide sealing cover (10) on the other side in a threaded manner, and the exhaust valve pipe (11) is in through connection with the inside of the air guide top seat (9) through the air guide sealing cover (10).
6. The flow data acquisition device of a gas production wellhead according to claim 1, wherein: the sealing valve plate (16) rotates around the lifting screw rod (15) to lift, the sealing ring is sleeved on the outer side of the sealing valve plate (16), and the sealing valve plate (16) is connected with the inner wall of the air guide top seat (9) in a fitting mode through the sealing ring.
7. The flow data acquisition device of a gas production wellhead according to claim 1, wherein: the self-sealing structure (17) comprises a mounting frame (71), a guide rail rod (72), a pressing spring (73), a lifting sleeve (74), a connecting frame (75) and a self-sealing air bag (76), wherein the mounting frame (71) is fixedly arranged on the inner wall of an air guide top seat (9), the guide rail rod (72) is fixedly arranged at the lower end of the mounting frame (71), the pressing spring (73) and the lifting sleeve (74) are sleeved on the outer side of the guide rail rod (72), the pressing spring (73) is located above the lifting sleeve (74), the connecting frame (75) is fixedly arranged on the outer side of the lifting sleeve (74), and the self-sealing air bag (76) is fixedly arranged on the outer side of the connecting frame (75) and the lifting sleeve (74).
8. The flow data acquisition device of a gas production wellhead according to claim 7, wherein: the upper end of the pressing spring (73) is connected with the mounting frame (71) in a fitting mode, the lifting sleeve (74) surrounds the guide rail rod (72) to lift, and the mounting frame (71) and the connecting frame (75) are of a cross-shaped structural design.
9. The flow data acquisition device of a gas production wellhead according to claim 7, wherein: the lifting screw (15) is connected with the upper end of the mounting frame (71) in a fitting mode, the sealing ring (18) is embedded into the circulation collection tube seat (1), the self-sealing air bag (76) is of a hollow semicircular structural design, and the self-sealing air bag (76) is connected with the inner wall of the sealing ring (18) in a fitting mode.
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