A gas detection and analysis device for oil fields

Abstract

The application discloses a kind of oilfield gas detection analysis devices, it is related to oilfield gas detection analysis technical field, including fixed frame, gas storage tank and air pump, and the side of fixed frame is fixed with gas storage tank by bolt;The present application is constantly pushed into pressurized shell by air pump outside gas, and the liquid solution stored in pressurized shell is pressed into liquid guide pipe while the air pressure rises, finally the liquid in liquid guide pipe enters into pressure transmission sleeve along sealing interface, and the releasing sleeve pushes the upper cone to contact the resistance cylinder and connecting pipe in fixed sleeve, so that the rubber arc block outside the resistance cylinder is contacted when the rock layer inner wall, the whole vent is opened, the air pump is collected around the gas in the borehole wall of this area at this time, and is analyzed by being sent into pressurized shell through gas guide pipe, multidirectional gas collection of rubber arc block, it is more accurate to detect the depth rock layer in later period.

Description

Technical Field

[0001] This invention relates to the field of oilfield gas detection and analysis technology, specifically to a gas detection and analysis device for oilfields. Background Technology

[0002] Oil and gas fields are the sum of oil and gas reservoirs within the same oil and gas producing area, controlled by a single geological structure (or stratigraphy). An oil and gas field may have one or more oil and gas reservoirs. Areas primarily containing oil reservoirs are called oil fields, and areas primarily containing gas reservoirs are called gas fields. Based on the geological factors controlling the oil and gas producing area, oil and gas fields are classified into three categories: structural oil and gas fields, where the oil and gas producing area is controlled by a single structural factor, such as folds and faults; stratigraphic oil and gas fields, where the oil-bearing area is controlled by stratigraphic factors (such as unconformities, pinch-outs, and lithological variations) on a regional anticline or monocline structural background; and composite oil and gas fields, where the oil and gas producing area is not controlled by a single structural or stratigraphic factor but by multiple geological factors. There are two main types of dynamic gases during oilfield extraction: 1. Gas produced by natural blowout wells; Natural blowout wells utilize the natural pressure energy of crude oil to collect the oil and gas that automatically gushes out. The gas that gushes out along with the crude oil is mainly non-methane total hydrocarbon gas, as well as small amounts of sulfur dioxide, hydrogen, hydrogen sulfide, carbon dioxide, and other gases. 2. Gases produced by multiple artificial oil recovery processes; Artificial oil extraction requires additional water or gas injection to provide new oil production power, enabling the stable production of crude oil from underground. Common gas injection methods include injecting natural gas or carbon dioxide.

[0003] During the oilfield development process, due to the influence of geological structure, the drilling borehole extends laterally to different depths. Gas in some small oil and gas reservoirs can pass through the rock strata to reach the borehole area. Gas detection at different depths of the entire oilfield drilling borehole is beneficial for the later oilfield development equipment to locate the oil and gas reservoirs around the drilling area, thus accelerating the overall oilfield development progress. Therefore, we propose a gas detection and analysis device for oil fields. Summary of the Invention

[0004] The purpose of this invention is to provide a gas detection and analysis device for oil fields to solve the problems mentioned in the background art. By fixing the entire spindle to the base rod and then clamping the spindle together with the base rod on the roller frame, it is convenient to fix the extension rod to one side of the base rod and send the spindle into different depths in the borehole by rotating the roller frame. This avoids the problem of not being able to perform gas detection and analysis on the surface of rock strata at different depths in the borehole. The external gas is continuously pushed into the pressurized shell by the air pump. As the gas pressure rises, the liquid solution stored in the pressurized shell is forced into the liquid guide pipe. Finally, the liquid in the liquid guide pipe enters the pressure transmission sleeve through the sealed interface, which avoids the problem of not being able to collect oilfield gas from different locations in the borehole and perform gas analysis. To achieve the above objectives, the present invention provides the following technical solution: A gas detection and analysis device for oil fields includes a fixed frame, a gas storage tank and a gas pump. The gas storage tank is fixed to one side of the fixed frame by bolts. Roller frames are symmetrically installed on one side of the fixed frame, and a base rod is slidably connected to the roller frame. A main shaft is sleeved and connected to the outer wall of the base rod. An upper connector is threaded to one side of the outer wall of the main shaft. A pressure transmission sleeve is slidably connected to the outer wall of the main shaft and inside the upper connector. A connecting sleeve is threaded to one side of the outer wall of the main shaft and the pressure transmission sleeve. A movable sleeve is threaded to one side of the connecting sleeve. A release sleeve is slidably connected to the opposite side of the main shaft and the movable sleeve and on the outer wall of the main shaft. A compression sleeve is threaded to the outer wall of the release sleeve. A sealing sleeve is bolted to the outer wall of the main shaft. One side of the compression sleeve abuts against the sealing sleeve. A pressing and stretching mechanism is installed on the outer wall of the main shaft. The pressing and stretching mechanism includes a locking sleeve, a fixing sleeve, a stop cylinder, a connecting tube, a return spring, and a rubber arc block. The outer wall of the main shaft is fitted with a fixing sleeve, and a stop cylinder is slidably connected within the fixing sleeve. A return spring is fixedly installed on the inner wall of the stop cylinder. A rubber arc block is installed at one end of the stop cylinder. Vent holes are evenly opened on one side of the return arc block, and a sealing gasket is slidably connected within the vent holes. A connecting tube is slidably connected within the return spring, and one end of the connecting tube is connected to the vent holes. One end of the connecting tube abuts against one side of the sealing gasket. A locking sleeve is fitted on the outer wall of the fixing sleeve, and one end of the connecting tube passes through the main shaft and is connected to a vent pipe. The upper cone is slidably connected inside the fixed sleeve, and one side of the release sleeve passes through the sealing sleeve and is fixed to one side of the upper cone.

[0005] Furthermore, a lower cone is slidably connected to the outer wall of the spindle and abuts against one side of the fixed sleeve. An unsealing ring is installed on the outer wall of the spindle, and an unsealing sleeve is fitted on the unsealing ring. A lower connector is slidably connected to the unsealing sleeve, and a pin is installed on the lower connector. One end of the pin passes through the lower connector and abuts against the unsealing sleeve.

[0006] Furthermore, a piston rod is slidably connected to the opposite surface of the pressure transmission sleeve and the main shaft, and a corrective spring is sleeved on the opposite surface of the connecting sleeve and the main shaft. One end of the piston rod passes through the connecting sleeve and is fixed to one side of the release sleeve.

[0007] Furthermore, an extension rod is threadedly connected to one side of the base rod, a sealing interface is provided on one side of the main shaft, and the sealing interface is connected to the pressure transmission sleeve on one side, and a liquid guide tube is connected to one side of the sealing interface.

[0008] Furthermore, a pressure shell is fixedly mounted on the fixed frame, and air vents are connected to both sides of the pressure shell. One end of one air vent is connected to an air storage tank, and the other end of the air vent is connected to an air pump. A one-way valve is installed on the air vent on one side of the air pump.

[0009] Furthermore, a valve stem is threadedly connected to the top of the pressurizing shell, a pressure block is slidably connected inside the pressurizing shell, one end of the valve stem is movably connected to one side of the pressure block via a bearing, a sealing block is slidably connected inside the pressurizing shell, and abutment springs are evenly installed on one side of the sealing block. One side of the abutment springs is connected to the pressure block. The bottom of the pressurizing shell is connected to one end of the liquid guide pipe, and a connecting valve is installed on the liquid guide pipe. One end of the air guide pipe is connected to a switching valve, and a vacuum pump is connected to one side of the switching valve.

[0010] Compared with the prior art, the beneficial effects of the present invention are: In this invention, by fixing the entire main shaft to the base rod and then clamping the main shaft together with the base rod onto the roller frame, it is convenient to subsequently fix the extension rod to one side of the base rod and use the rotation of the roller frame to send the main shaft into different depths in the borehole. This facilitates subsequent gas detection and analysis of the rock surface at different depths in the borehole. In case of an emergency, when the sealing sleeve and rubber arc block installed on the outside of the main shaft become blocked by the rock strata inside the oilfield borehole, the rotation of the roller frame drives the extension rod to pull the base rod. The base rod generates tension on the unsealing sleeve, causing the pin installed on the unsealing sleeve to break. At this time, the entire lower joint falls off, and the lower cone can move within the pressure extension mechanism, causing the entire pressure extension mechanism to move downward. At this time, the entire sealing sleeve and rubber arc block change from a fixed abutment state to a movable state, allowing for telescopic operation and disengagement from the rock strata in the borehole. This makes it convenient to pull out the main shaft sleeve components other than the lower joint from the oilfield borehole, preventing the problem of the entire collection equipment getting stuck in the borehole during oilfield gas collection. In this invention, an external gas is continuously pushed into the pressurized shell by an air pump. As the gas pressure rises, the liquid solution stored in the pressurized shell is forced into the liquid guide pipe. Finally, the liquid in the liquid guide pipe enters the pressure transmission sleeve through the sealed interface, pushing the entire piston rod and causing the extrusion sleeve to enter the sealing sleeve, supporting the entire sealing sleeve. The supported sealing sleeve abuts against the inner wall of the borehole, avoiding the influence of air above the borehole when detecting gas on the rock wall of the oilfield borehole. At the same time, the release sleeve pushes the upper cone to contact the abutment and connecting pipe inside the fixed sleeve, so that when the rubber arc block located outside the abutment contacts the inner wall of the rock stratum, the entire vent hole opens. At this time, the air pump continuously collects the gas around the inner wall of the borehole in this area and sends it into the pressurized shell for analysis through the air guide pipe. The multi-directional gas collection by the rubber arc block facilitates more accurate detection of rock strata at this depth in the later stage. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the gas detection and analysis device for oil fields according to the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the pressure shell of the present invention; Figure 3 This is a schematic diagram of the connection structure between the base rod and the main shaft of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the main shaft of the present invention; Figure 5 This is a side sectional view of the pressing and stretching mechanism of the present invention; Figure 6 This is a schematic diagram of the ventilation hole structure on the rubber arc block of the present invention; Figure 7 This is a schematic diagram of the upper connector upper air guide tube connection structure of the present invention; Figure 8 This is a schematic diagram of the entire structure of the base rod of the present invention; Figure 9 This is a schematic diagram of the connection structure between the main shaft and the abutment of the present invention.

[0012] In the diagram: 1. Fixed frame; 2. Air storage tank; 3. Pressurized shell; 4. Vent pipe; 5. Valve stem; 6. Pressure block; 7. Sealing block; 8. Abutment spring; 9. Check valve; 10. Air pump; 11. Roller frame; 12. Switching valve; 13. Base rod; 14. Extension rod; 15. Main shaft; 16. Sealing interface; 17. Liquid guide pipe; 18. Connecting valve; 19. Upper connector; 20. Pressure transmission sleeve; 21. Piston rod; 22. Connecting sleeve; 23. Correcting spring 24. Spring; 25. Moving sleeve; 26. Release sleeve; 27. Compression sleeve; 28. Sealing sleeve; 29. ​​Upper cone; 20. Pressing and stretching mechanism; 291. Locking sleeve; 292. Fixed sleeve; 293. Abutment; 294. Connecting pipe; 295. Return spring; 296. Rubber arc block; 297. Vent hole; 298. Sealing gasket; 299. Air guide pipe; 30. Lower cone; 31. Unsealing ring; 32. Lower connector; 33. Pin; 34. Unsealing sleeve. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figure 1-9 The present invention provides a technical solution: Example 1

[0015] Gas detection and analysis equipment for oil fields is involved in the collection of oil field gases. However, during the oil field development process, some drilling holes fail to collect oil and gas. Gas detection and analysis of such oil field drilling holes is beneficial for detecting oil and gas reservoirs contained in rock strata at different depths centered on the drilling hole. In specific operations, such as Figure 1 As shown, a gas storage tank 2 is installed on the entire mounting frame 1. The gas storage tank 2 is used to store the gas collected from the entire front-end oilfield, preventing harmful gases present in the oilfield from directly entering the air. A pressurization shell 3 is installed on one side of the gas storage tank 2. The pressurization shell 3 is used to inspect and analyze the collected gas, such as... Figure 2As shown, since the main component of oilfield gas is methane, and it contains small amounts of ethane, propane, butane, pentane and hexane, if the gas concentration collected at the front end is low, the valve stem 5 on one side of the pressurized shell 3 can be rotated to compress the collected gas entering the pressurized shell 3 through the pressure block 6 and the sealing block 7, which makes it easier for the gas detection equipment installed on the pressurized shell 3 to detect it better. At the same time, there is liquid inside the entire pressurized shell 3. When the pressure inside the entire pressurized shell 3 increases, it is easy to force the liquid inside the pressurized shell 3 out from the side of the liquid guide pipe 17. At the same time, the liquid guide pipe 17 is equipped with a connecting valve 18 for the operator to control the flow of liquid. A retaining spring 8 is also installed between the pressure block 6 and the sealing block 7. The entire pressurized shell 3 has a vent pipe 4 connected to a vacuum pump 10 on one side. A one-way valve 9 is also installed on the vent pipe 4, allowing only the vacuum pump 10 to pump in gas. A switching valve 12 is connected to one side of the vacuum pump 10. Since the entire front-end oilfield gas acquisition equipment is connected to six gas guide pipes 299, and these six gas guide pipes 299 correspond to different directions, the vacuum pump 10 usually first extracts the gas from the six gas guide pipes 299 to determine whether there is oilfield gas at the fixed depth of the borehole. Then, by switching the vacuum pump 10 to connect with the six gas guide pipes 299 one by one, the oil and gas reservoirs in the rock strata in the approximate direction of the fixed depth of the borehole can be determined, which facilitates the later location of the area and the oilfield drilling operation. Example 2

[0016] The entire fixed frame 1 is also symmetrically equipped with roller frames 11, which are used to clamp and fix the extension rod 14. The rotation of the clamping rollers on the roller frame 11 drives the extension rod 14 to move up and down, thereby enabling the front-end gas collection device to move up and down inside the oilfield borehole. At the same time, when the entire front-end gas collection device is blocked in the oilfield borehole, in order to facilitate the removal of the entire gas collection device, extension rod 14 and base rod 13, such as... Figure 4 As shown, the fixing operation of the base rod 13 involves first inserting the side without the locking block through the lower connector 32, so that the side of the base rod 13 with the locking block abuts against the side of the unsealing sleeve 34. The overall structure of the base rod 13 is as follows. Figure 8 As shown, one end of the extension rod 14 is threadedly connected to the base rod 13; Since there is still a certain distance between the entire unsealing sleeve 34 and the main shaft 15, and the entire unsealing sleeve 34 is fixed to the lower connector 32 by the pin 33, the entire unsealing sleeve 34 is fixed to the outer wall of the main shaft 15 by the unsealing ring 31, and the entire unsealing ring 31 is engaged with the outer wall of the main shaft 15. The outer wall of the unsealing ring 31 is elastic, which makes it easy to press the entire unsealing sleeve 34 tightly. When the sealing sleeve 27 on the outside of the entire main shaft 15 is engaged with the rubber arc block 296 in the oilfield borehole, the extension rod 14 cannot drive the base rod 13 to move up and down under the movement of the roller frame 11, thus affecting the gas collection of the entire oilfield borehole. At this point, a certain pulling force can be applied to the extension rod 14. This can be achieved by increasing the clamping and lifting power of the clamping rollers on the entire roller frame 11, or by using a rotating tensioning tool to apply force to one end of the extension rod 14. When the entire base rod 13 generates an upward pulling force that acts on the unsealing sleeve 34, the unsealing sleeve 34 first detaches from the compression of the entire unsealing ring 31 and moves toward the end of the main shaft 15. At the same time, the entire pin 33 breaks, causing the lower connector 32 to fall off. The entire lower cone 30 used to abut against the pressing and stretching mechanism 29 begins to move, causing the entire pressing and stretching mechanism 29 to... After moving downwards a certain distance, the entire rubber arc block 296 can move, and at the same time, the entire upper cone 28 can move, which in turn allows the entire sealing sleeve 27 to move. After the rubber arc block 296 and the sealing sleeve 27, which were originally against the inner wall of the oilfield borehole, can move, the entire base rod 13 and the oilfield gas collection device can be pulled out of the oilfield borehole as a whole. This method is only suitable for emergencies. This causes the lower connector 32 on the outside of the entire unsealing sleeve 34 to fall off, while the remaining outer components of the main shaft 15 are retained. A new lower connector 32 needs to be reinstalled later. Example 3

[0017] The entire oilfield gas detection front-end acquisition equipment is as follows: Figure 4 As shown, based on the main shaft 15, an upper connector 19 is installed on one side of the rotating shaft. The entire upper connector 19 is threadedly connected to the main shaft 15. A pressure transmission sleeve 20 is slidably connected to the outer wall of the upper connector 19 and the main shaft 15. A piston rod 21 is slidably connected inside the entire pressure transmission sleeve 20. One side of the entire piston rod 21 passes through the connecting sleeve 22 and is fixed to one side of the release sleeve 25. One side of the entire release sleeve 25 passes through the bottom of the sealing sleeve 27 and is connected to the upper cone 28. A straightening spring 23 is also sleeved between the entire connecting sleeve 22 and the release sleeve 25. A compression sleeve 26 is sleeved on the outside of the entire release sleeve 25, and one side of the compression sleeve 26 is pressed into the sealing sleeve 27. At the same time, one side of the entire upper cone 28 is pressed into the pressing and stretching mechanism 29. A sealing interface 16 is provided on one side of the main shaft 15, and one side of the sealing interface 16 is connected to the pressure transmission sleeve 20. When it is necessary to collect gas around the inner wall of the entire oilfield borehole, the operator begins to pressurize the pressurizing shell 3, causing the liquid in the pressurizing shell 3 to enter the sealing interface 16 along the liquid guide pipe 17, and finally squeeze the piston rod 21 located inside the pressure transmission sleeve 20. The piston rod 21 drives the release sleeve 25 to move downward, and the entire compression sleeve 26 begins to move downward and continuously squeezes the sealing sleeve 27, causing the entire sealing sleeve 27 to unfold and abut against the borehole wall at the borehole, avoiding the influence of the air above the borehole when extracting and detecting gas from the rock wall of the oilfield borehole. The entire moving sleeve 24 and the upper cone 28 move downward simultaneously, such as Figure 5 and Figure 9As shown, a fixed sleeve 292 is fitted on the outer wall of the entire main shaft 15, and six sets of abutment cylinders 293 are evenly slidably connected on the fixed sleeve 292. A rubber arc block 296 is connected to one side of each abutment cylinder 293, and a connecting pipe 294 is slidably connected inside the entire abutment cylinder 293. A sealing gasket 298 is connected to one side of the connecting pipe 294. The sealing gasket 298 abuts against the vent hole 297 on the rubber arc block 296. In the initial state, the sealing gasket 298 is located at the front end of the vent hole 297. As the entire upper cone 28 moves downward, it begins to contact the fixed sleeve 292. The abutment 293 on one side causes the entire abutment 293 to move outward into the groove. One end of the abutment 293 is connected to a rubber arc block 296, causing the entire rubber arc block 296 to move outward and abut against the hole wall. At this time, the entire sealing gasket 298 seals the entire vent hole 297, preventing the vent hole 297 from being blocked when the rubber arc block 296 abuts against the hole wall. As the entire upper cone 28 continues to move downward, one side of the upper cone 28 begins to contact the connecting pipe, causing the entire connecting pipe to move and push the entire sealing gasket 298 out from the vent hole 297 side. Figure 6 As shown in the diagram, the entire rubber arc block 296 is unfolded. When the entire vent 297 is opened, the entire air pump 10 starts to work. One end of the entire air guide pipe 299 is connected to the switching valve 12. The air pump 10 first draws the gas from the six sets of air guide pipes 299 into the switching valve 12. The connection between the entire air pump 10 and the air guide pipe 299 is adjusted by the switching valve 12. The gas from the entire air guide pipe 299 is first drawn into the pressurizing shell 3. The pressurizing shell 3 then checks the drawn-in gas. After no oilfield gas is detected, it indicates that there is no oil or gas reservoir in the cross section of the fixed depth of the borehole. When oilfield gas is detected in the entire pressurized housing, the gas in the pressurized housing 3 is first discharged into the gas storage tank 2. Then, the gas in the area collected by the single gas pipe 299 is drawn into the pressurized housing 3 through the adjustment of the switching valve 12. Gas collection and detection are carried out on each cross section of the fixed depth of the borehole, which makes it convenient for staff to locate the oil and gas reservoir in the area in a timely manner and accelerate the subsequent collection rate of oil and gas. After the gas sampling at a fixed depth in the fixed oilfield is completed, the pressurized fluid supply at the sealing interface 16 is stopped. At this time, the correction spring 23 starts to act and pushes the piston rod 21 upward. The entire upper cone 28 disengages from the contact between the abutment cylinder 293 and the connecting pipe. At this time, the return spring 295 calibrates the position of the entire abutment cylinder 293 and the connecting pipe. The entire rubber arc block 296 can then move on the locking sleeve 291, disengaging from the contact between the entire borehole wall. At the same time, the entire extrusion sleeve 26 no longer presses against the entire sealing sleeve 27, and the entire sealing sleeve 27 can also move, making it convenient for subsequent personnel to move the entire spindle 15 to different depths in the borehole for subsequent gas sampling and detection operations.

[0018] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0019] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0020] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A gas detection and analysis device for oilfields, comprising a mounting frame (1), a gas storage tank (2), and a gas pump (10), wherein the gas storage tank (2) is bolted to one side of the mounting frame (1), characterized in that: A roller frame (11) is symmetrically installed on one side of the fixed frame (1), and a base rod (13) is slidably connected on the roller frame (11). A main shaft (15) is sleeved on the outer wall of the base rod (13). The outer wall of the main shaft (15) is threaded with an upper connector (19). The outer wall of the main shaft (15) and the inner side of the upper connector (19) are slidably connected with a pressure transmission sleeve (20). The outer wall of the main shaft (15) and the side of the pressure transmission sleeve (20) are threaded with a connecting sleeve (22). The side of the connecting sleeve (22) is threaded with a movable sleeve (24). The opposite face of the main shaft (15) and the movable sleeve (24) and the outer wall of the main shaft (15) are slidably connected with a release sleeve (25). The outer wall of the release sleeve (25) is threaded with a compression sleeve (26). The outer wall of the main shaft (15) is bolted with a sealing sleeve (27). One side of the compression sleeve (26) abuts against the sealing sleeve (27). The outer wall of the main shaft (15) is equipped with a pressing and stretching mechanism (29). The pressing and stretching mechanism (29) includes a locking sleeve (291), a fixing sleeve (292), a pusher cylinder (293), a connecting tube, a return spring (295), and a rubber arc block (296). The fixing sleeve (292) is installed on the outer wall of the main shaft (15), and the pusher cylinder (293) is uniformly slidably connected inside the fixing sleeve (292). The return spring (295) is fixedly installed on the inner wall of the pusher cylinder (293). A rubber arc block (296) is installed at one end of the pusher cylinder (293), and one side of the return arc block is uniformly opened. There is a vent hole (297), and a sealing gasket (298) is slidably connected inside the vent hole (297). A connecting pipe (294) is slidably connected inside the return spring (295), and one end of the connecting pipe (294) is connected to the vent hole (297). One end of the connecting pipe (294) abuts against one side of the sealing gasket (298). A locking sleeve (291) is fitted on the outer wall of the fixed sleeve (292). One end of the connecting pipe (294) passes through the main shaft (15) and is connected to the air guide pipe (299). The upper cone (28) is slidably connected inside the fixed sleeve (292), and one side of the release sleeve (25) passes through the sealing sleeve (27) and is fixed to one side of the upper cone (28).

2. The gas detection and analysis device for oilfields according to claim 1, characterized in that: A lower cone (30) is slidably connected to the outer wall of the main shaft (15) and abuts against one side of the fixed sleeve (292). An unsealing ring (31) is installed on the outer wall of the main shaft (15), and an unsealing sleeve (34) is fitted on the unsealing ring (31). A lower connector (32) is slidably connected to the unsealing sleeve (34), and a pin (33) is installed on the lower connector (32). One end of the pin (33) passes through the lower connector (32) and abuts against the unsealing sleeve (34).

3. The gas detection and analysis device for oilfields according to claim 2, characterized in that: The pressure transmission sleeve (20) is slidably connected to the opposite surface of the main shaft (15) by a piston rod (21). The connecting sleeve (22) is fitted with a corrective spring (23) on the opposite surface of the main shaft (15) and located on the main shaft (15). One end of the piston rod (21) passes through the connecting sleeve (22) and is fixed to one side of the release sleeve (25).

4. The gas detection and analysis device for oilfields according to claim 3, characterized in that: The base rod (13) is threaded with an extension rod (14) on one side, and a sealing interface (16) is provided on one side of the main shaft (15), and the sealing interface (16) is connected to the pressure transmission sleeve (20) on one side. A liquid guide tube (17) is connected to one side of the sealing interface (16).

5. The gas detection and analysis device for oilfields according to claim 4, characterized in that: A pressure shell (3) is fixedly mounted on the fixed frame (1), and air pipes (4) are connected to both sides of the pressure shell (3). One end of one air pipe (4) is connected to the air storage tank (2), and the other end of the air pipe (4) is connected to the air pump (10). A one-way valve (9) is installed on the air pipe (4) on one side of the air pump (10).

6. The gas detection and analysis device for oilfields according to claim 5, characterized in that: The top of the pressurizing shell (3) is threaded with a valve stem (5), and a pressure block (6) is slidably connected inside the pressurizing shell (3). One end of the valve stem (5) is movably connected to one side of the pressure block (6) through a bearing. A sealing block (7) is slidably connected inside the pressurizing shell (3), and abutment springs (8) are evenly installed on one side of the sealing block (7). One side of the abutment springs (8) is connected to the pressure block (6). The bottom of the pressurizing shell (3) is connected to one end of the liquid guide pipe (17), and a connecting valve (18) is installed on the liquid guide pipe (17). One end of the air guide pipe (299) is connected to a switching valve (12), and one side of the switching valve (12) is connected to the air pump (10).

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