Protector for capillary probe

Abstract

The invention provides a protector for a capillary probe, which can be used in the technical field of test protection devices, and comprises a needle head, a filter screen, a first protective sleeve sleeving a sleeve and a second protective sleeve sleeving the first protective sleeve, a through hole is formed in the second protective sleeve, the filter screen is contained in the through hole, the two ends of the second protective sleeve and the two ends of the first protective sleeve are connected with the sleeve in a sealed mode, and a cavity is formed between the first protective sleeve and the sleeve; one end of the capillary probe is connected with the capillary tube, and the other end of the capillary probe is provided with a needle head which faces the filter screen; when the protector descends to a designated coal seam outside the filter screen, gas is injected into the capillary probe, the needle head is pushed to be pressed out and pierce the first protective sleeve, and gas of the designated coal seam flows into the cavity through the filter screen. The protector of the capillary probe is simple and reliable in structure, the situation that the capillary probe collides with the well wall in the tripping-in process and is prone to damage can be avoided, and the capillary probe is prevented from being polluted by mud in the well cementation process.

Description

Technical Field

[0001] This application relates to the technical field of test protection devices, and in particular to a protector for a capillary probe. Background Art

[0002] Underground coal gasification technology is a coal cleaning and efficient utilization technology that integrates three major processes: shaft sinking, coal mining, and gasification, and is one of the key research directions in the new energy and new business fields.

[0003] During the production process of underground coal gasification, the pressure of the coal seam is one of the main parameters for maintaining the normal production of underground coal gasification and controlling the quality of syngas. Since the bottom hole temperature of underground coal gasification is between 600 and 800 °C, all electronic, quartz and other pressure sensors and related test equipment cannot operate under this working condition. The capillary pressure sensor, because there are no electronic devices in the well, is a test tool with extremely high cost performance for pressure testing in the current underground high-temperature environment.

[0004] In order to ensure the safe and normal operation of the capillary pressure sensor, the sensor needs to be fixed by lowering it with the production casing. However, the capillary probe is prone to collision with the wellbore during the lowering process, causing damage, and the capillary probe is prone to mud contamination during the cementing process. Summary of the Invention

[0005] In view of at least one problem in the prior art, this application proposes a protector for a capillary probe. The structure of the protector for the capillary probe is simple and reliable, which can avoid the easy damage caused by the collision of the capillary probe with the wellbore during the lowering process, and avoid the mud contamination of the capillary probe during the cementing process, thereby improving the safety of the capillary probe.

[0006] To solve the above technical problems, this application provides the following technical solutions:

[0007] This application provides a protector for a capillary probe, including:

[0008] A needle, a filter screen, a first protective sleeve sleeved on the casing, and a second protective sleeve sleeved on the first protective sleeve;

[0009] The second protective sleeve is provided with a first through hole, the filter screen is accommodated in the first through hole, both ends of the second protective sleeve and the first protective sleeve are hermetically connected to the casing, and a chamber is formed between the first protective sleeve and the casing;

[0010] The capillary probe extends into the chamber, one end of the capillary probe is connected to a capillary, the connection between the capillary and the chamber is hermetically connected, the other end of the capillary probe is provided with the needle, and the needle faces the inside of the filter screen;

[0011] When the protector is lowered to a specified coal seam outside the filter screen, gas is injected into the capillary probe through the capillary. This gas pushes the needle out and pierces the first protective sleeve, and the gas in the specified coal seam flows into the chamber through the filter screen.

[0012] In one embodiment, the first protective sleeve is a hollow rubber protective sleeve, and water is contained inside the hollow rubber protective sleeve.

[0013] In one embodiment, there is close contact between the first protective sleeve and the second protective sleeve.

[0014] In one embodiment, the needle is a hollow needle;

[0015] The hollow needle includes: a needle hub, a needle shaft, and a needle tip connected in sequence; a channel is provided in the needle hub, and the needle tip faces the inside of the filter screen.

[0016] In one embodiment, the hollow needle further includes: an aluminum metal film that completely blocks the channel;

[0017] When the protector is lowered to a specified coal seam outside the filter screen, the capillary injects gas into the capillary probe. This gas pushes the needle out, pierces the first protective sleeve, and breaks through the aluminum metal film.

[0018] In one embodiment, the capillary probe is L-shaped, and the turning part is arc-shaped.

[0019] In one embodiment, one end of the second protective sleeve is provided with a second through hole, one end of the first protective sleeve is provided with a third through hole, the capillary probe extends into the chamber through the second through hole and the third through hole in sequence, and the capillary is hermetically connected to the second through hole and the third through hole through a one-way valve joint.

[0020] In one embodiment, one end of the second protective sleeve and the first protective sleeve is hermetically connected to the casing through a first sealing plug, and the other end of the second protective sleeve and the first protective sleeve is hermetically connected to the casing through a second sealing plug.

[0021] In one embodiment, a plurality of fourth through holes are provided on the side wall of the needle shaft.

[0022] In one embodiment, the second protective sleeve is a metal protective sleeve.

[0023] As can be seen from the above technical solution, the present application provides a protector for a capillary probe. Among them, the protector includes: a needle, a filter screen, a first protective sleeve sleeved on a sleeve, and a second protective sleeve sleeved on the first protective sleeve; a first through hole is provided in the second protective sleeve, the filter screen is accommodated in the first through hole, both ends of the second protective sleeve and the first protective sleeve are hermetically connected to the sleeve, and a chamber is formed between the first protective sleeve and the sleeve; the capillary probe extends into the chamber, one end of the capillary probe is connected to a capillary, the connection between the capillary and the chamber is hermetically connected, the other end of the capillary probe is provided with the needle, and the needle faces the inside of the filter screen; when the protector is lowered to a designated coal seam outside the filter screen, gas is injected into the capillary probe through the capillary, and the gas pushes the needle out and pierces the first protective sleeve, and the gas in the designated coal seam flows into the chamber through the filter screen. The structure of the protector of the capillary probe is simple and reliable, which can avoid the easy damage caused by the collision of the capillary probe with the wellbore during the lowering process, and avoid the mud pollution of the capillary probe during the cementing process, thereby improving the safety of the capillary probe; the second protective sleeve protects the capillary probe from colliding with the wellbore during the lowering process; the first protective sleeve can play a further buffering role; the needle pierces the first protective sleeve, the first protective sleeve ruptures, and the gas enters the capillary probe from the filter screen, which can avoid the mud pollution of the capillary probe during the cementing process; specifically, the protector of the capillary probe can protect the capillary probe from being safely lowered during the drilling and completion process; prevent other sundries such as mud from blocking the capillary probe during the lowering process; in addition, prevent the capillary probe from being damaged by colliding with the wellbore during the lowering process; when the capillary probe is lowered in place, after the hollow needle is pressurized to pierce the first protective sleeve, the capillary probe can form a larger pressure conduction space to ensure the rapid conduction of pressure. That is to say, the hollow structure of the capillary needle can ensure that the gas quickly transfers from the coal seam to the capillary. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a first schematic structural diagram of the protector of the capillary probe in the embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the relationship between the needle, the capillary probe, the first protective sleeve and the filter screen before the needle is pressed out in the embodiment of the present application;

[0027] Figure 3 It is a schematic diagram showing the relationship among the needle, the capillary probe, the first protective sleeve and the filter screen after the needle is pressed out in the embodiment of the present application;

[0028] Figure 4 It is a schematic cross-sectional view of the hollow needle in the embodiment of the present application;

[0029] Figure 5 It is a schematic side view of the hollow needle in the embodiment of the present application;

[0030] Figure 6 It is a second structural schematic diagram of the protector of the capillary probe in the embodiment of the present application.

[0031] Symbol Explanation

[0032] 1. Needle;

[0033] 01. Syringe Plunger;

[0034] 02. Needle Shaft;

[0035] 03. Needle Tip;

[0036] 04. Channel;

[0037] 05. Fourth Through Hole;

[0038] 06. Aluminum Metal Film;

[0039] 2. Filter Screen;

[0040] 3. Sleeve;

[0041] 4. First Protective Sleeve;

[0042] 5. Second Protective Sleeve;

[0043] 6. Capillary Probe;

[0044] 7. Capillary;

[0045] 8. One-way Valve Joint;

[0046] 9. First Sealing Plug;

[0047] 10. Second Sealing Plug;

[0048] 11. Wellbore. Detailed Implementation Manner

[0049] To enable those skilled in the art to better understand the technical solutions in this specification, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0050] In the control process flow of underground coal gasification operation, to improve the gasification operation stability, resource conversion rate, and gasification efficiency, it is necessary to study the gasification operation control method in advance and formulate the gasification operation work system. The pressure at the bottom of the production well at the end of the gasification cavity in the coal seam is one of the key operating parameters. For specific coal seam conditions, obtaining the pressure at the bottom of the underground coal gasification production well is one of the important bases for determining the work system of the production well. Therefore, during the implementation of the on-site process plan, it is necessary to obtain the pressure data at the bottom of the production well in real time to determine the production status under the target coal seam and corresponding implementation working conditions, which serves as an important basis for the adjustment of the plan during the test demonstration and commercial development stages. Since the temperature around the bottom of the coalbed methane production well is relatively high, generally 600 - 800 degrees Celsius, conventional pressure gauges cannot be used in this environment due to the temperature limitation of electronic components within the range of 200°C. Therefore, the capillary pressure sensor is a very cost-effective test tool for pressure testing in the current underground high-temperature environment.

[0051] The embodiment of this application proposes a pushing method for a hollow needle to pierce a capsule, and proposes to apply the first protective sleeve pressure balance method to make the first protective sleeve in close contact with the second protective sleeve, which can prevent mud pollution and blockage of the probe; the second protective sleeve is fixed on the casing, which can prevent the probe from colliding with the well wall and causing damage during the lowering process; the second protective sleeve can provide a communication space between the capillary probe and the coal seam. The main technical indicators of the protector of the capillary probe provided by the embodiment of this application include: the applicable pressure range can be: 0 - 50 MPa, the temperature range can be: 0 - 1000°C, and the depth range can be: 0 - 4000 m.

[0052] The protector for the capillary probe provided by this application can effectively protect the capillary probe from being contaminated or blocked by debris such as mud during the lowering process, can effectively prevent the capillary probe from being knocked against the wellbore wall during the lowering process and causing mechanical damage, and can form an effective space to keep the capillary probe in good communication with the coal seam outside the casing, providing certain protection during the process of lowering the capillary pressure sensor into the well. Further, it can be used for the bottom-hole pressure data of the underground coal gasification production well during the production process for scheme adjustment, providing data for the gasification operation parameters (gasifying agent ratio, injection rate), applicable to basic research such as the gasification process of shallow, medium-deep, and deep underground coal gasification, as well as research on gasification operation control methods and process technologies. It can effectively support the normal coal seam pressure test of underground coal gasification, provide a more reliable pressure condition at the bottom of the synthesis gas production well for underground coal gasification, and provide technical guarantee for controlling the quality and output of the underground coal gasification synthesizer. It is of great significance for improving the basic research level of underground coal gasification and perfecting the experimental ability of underground coal gasification to promote the R & D and business development of underground coal gasification technology.

[0053] Specifically, it is described through the following various embodiments.

[0054] In order to avoid the easy damage caused by the collision between the capillary probe and the wellbore wall during the lowering process, and avoid the capillary probe from being contaminated by mud during the cementing process, thereby improving the safety of the capillary probe, an embodiment of a protector for the capillary probe is provided in this application. As Figure 1 shown, in this embodiment, the protector specifically includes the following:

[0055] A needle 1, a filter screen 2, a first protective sleeve 4 sleeved on a casing 3, and a second protective sleeve 5 sleeved on the first protective sleeve 4; the second protective sleeve 5 is provided with a first through hole, the filter screen 2 is accommodated in the first through hole, both ends of the second protective sleeve 5 and the first protective sleeve 4 are hermetically connected to the casing 3, and a chamber is formed between the first protective sleeve 4 and the casing 3; the capillary probe 6 extends into the chamber, one end of the capillary probe 6 is connected to a capillary 7, the connection between the capillary and the chamber is hermetically connected, the other end of the capillary probe 6 is provided with the needle 1, and the needle 1 faces the inside of the filter screen 2; when the protector is lowered to a specified coal seam outside the filter screen 2, gas is injected into the capillary probe 6 through the capillary, and this gas pushes the needle 1 out and pierces the first protective sleeve 4, and the gas in the specified coal seam flows into the chamber through the filter screen 2. The second protective sleeve can be a hard material protective sleeve, such as a steel material protective sleeve. The first protective sleeve can be an elastic material protective sleeve, such as a rubber protective sleeve.

[0056] Specifically, the filter screen can be fixedly connected to the first through hole and completely block the first through hole; before the gas pushes the needle 1 out to pierce the first protective sleeve, the chamber formed between the first protective sleeve and the casing is a sealed chamber; after the protector is respectively and fixedly installed with the capillary probe and the casing, the protector and the capillary probe can be lowered into the wellbore 11 with the casing to the outside of the filter screen for the specified coal seam; the specified coal seam can be specified according to actual needs, and this application does not limit this. Gas can be injected into the capillary probe 6 from the ground via the capillary. The injected gas can be nitrogen. After the first protective sleeve 4 is ruptured, the injection of gas into the capillary probe 6 through the capillary can be stopped. The gas in the specified coal seam can represent the air in the specified coal seam. The gas in the specified coal seam flows into the chamber through the filter screen 2, and the pressure of the coal seam can be transmitted to the capillary probe 6, and then the pressure can be transmitted to the ground pressure measuring device through the capillary. The well casing can be the casing of an underground coal gasification production well or a vertical well casing, etc. To improve the efficiency of pushing the needle, the capillary probe can be L-shaped, and the turning point is arc-shaped. As shown in Figure 2 As shown, the needle is inside the capillary probe before being pushed out, as shown in Figure 3 As shown, after the needle is pushed out, it pierces the first protective sleeve.

[0057] To further improve the buffering effect of the first protective sleeve when the second protective sleeve collides with the well wall, preferably, the first protective sleeve is a hollow rubber protective sleeve, and water is contained in the body of the hollow rubber protective sleeve. The first protective sleeve and the second protective sleeve can be in close contact. When the needle pierces and the hollow rubber protective sleeve ruptures, the water in the body of the hollow rubber protective sleeve flows out.

[0058] To ensure that the gas can quickly transfer from the coal seam to the chamber, as shown in Figure 4 and Figure 5 As shown, preferably, the needle 1 is a hollow needle; the hollow needle includes: a needle shank 01, a needle stem 02, and a needle tip 03 connected in sequence; a channel 04 is provided in the needle shank 01, and the needle tip faces the inside of the filter screen.

[0059] Specifically, the plunger is slightly smaller than the capillary diameter and is placed in the capillary probe. When the pressure is high enough and the pressure on the side of the plunger is greater than the frictional force, the plunger will be pushed forward by the air pressure and the needle tip does not need to be retracted. When the protector is lowered to the designated coal seam outside the filter screen 2, gas is injected into the capillary probe 6 through the capillary from the ground. This gas pushes the hollow needle tip out and pierces the first protective sleeve 4. The gas in the coal seam can enter the chamber through the rupture of the first protective sleeve 4, or can enter the capillary probe 6 through the needle tip 03, the needle stem 02 and the plunger 01. Pressurize and inflate from the top of the ground capillary. The gas passes through the one-way valve and pushes the hollow needle tip in the bent part inside the capillary to pierce the wall of the first protective sleeve 4, so that the capillary is connected to the annular space inside the protector and can be connected to the external coal seam through the filter screen 2, that is, the pressure in the coal seam outside the casing can be measured. It can effectively prevent external mud and the like from entering the capillary protector, and can protect the capillary protector from colliding with the wellbore during lowering and causing mechanical damage; the gas can be transmitted to the capillary probe through the hollow structure in the hollow needle tip, which can further improve the timeliness and efficiency of transmitting the gas in the coal seam to the capillary probe.

[0060] To improve the efficiency of pushing the needle tip, preferably, the hollow needle tip further includes: an aluminum metal film 06, which completely blocks the channel 04; when the protector is lowered to the designated coal seam outside the filter screen 2, the capillary injects gas into the capillary probe 6, and this gas pushes the needle tip 1 out, pierces the first protective sleeve 4 and breaks through the aluminum metal film 06. When the first protective sleeve 4 breaks through the aluminum metal film, the capillary probe 6, the channel 04, the needle stem 02 and the needle tip 03 can be conducted in sequence.

[0061] To further form a larger pressure guiding space in the capillary probe and ensure the rapid conduction of pressure, preferably, a plurality of fourth through holes 05 are provided on the side wall of the needle stem 02. When the hollow needle pierces the first protective sleeve 4, at least a part of the plurality of fourth through holes 05 is still in the chamber, which can accelerate the transmission of the gas in the coal seam to the chamber through the through holes.

[0062] To avoid the backflow of water in the capillary, preferably, a second through hole is provided at one end of the second protective sleeve 5, a third through hole is provided at one end of the first protective sleeve 4, the capillary probe 6 extends into the chamber through the second through hole and the third through hole in sequence, and the capillary is hermetically connected to the second through hole and the third through hole through the one-way valve joint 8. After the needle tip pierces the rubber protective sleeve, the one-way flow valve opens, the space between the capillary and the second protective sleeve is connected, and the pressure transmission space increases, which is beneficial to the conduction of pressure to the capillary.

[0063] In order to further improve the stability of the connection between the protector and the sleeve 3, preferably, one end of the second protective sleeve 5 and the first protective sleeve 4 is sealed and connected to the sleeve 3 through a first sealing plug 9, and the other end of the second protective sleeve 5 and the first protective sleeve 4 is sealed and connected to the sleeve 3 through a second sealing plug 10. Both the first sealing plug 9 and the second sealing plug 10 can be metal threaded sealing plugs.

[0064] To further illustrate the present solution, the present application provides an application example of a protector for a capillary probe. In this application example, the protector includes: a pressure measuring capillary; a one-way valve; a metal protective sleeve; a metal threaded sealing plug; a filter; a rubber protective sleeve; and a hollow needle.

[0065] The metal protective sleeve is placed on the outside of the vertical well casing and sealed by a metal threaded sealing plug. A filter structure is set at the bottom of the metal protective sleeve to connect the metal protective sleeve with the outside air and prevent large particles of mud and other debris from entering the metal protective sleeve. The rubber protective sleeve is placed inside the metal protective sleeve, filled with water, propped up the rubber protective sleeve, and tightly connected with the metal protective sleeve to occupy the space inside the metal protective sleeve and prevent external mud and other debris from entering the metal protective sleeve. The one-way valve joint passes through the metal protective sleeve and the rubber protective sleeve to connect and place the pressure measuring capillary to prevent the water in the pressure measuring capillary from flowing back. The pressure measuring capillary passes through the one-way valve, the metal protective sleeve, and the rubber protective sleeve space. The bottom is bent in the horizontal direction. A hollow needle is placed inside the horizontal section. The end of the pressure measuring capillary needs to be placed on the same horizontal line of the filter screen and face the direction of the filter screen. By injecting enough pressure into the pressure measuring capillary, the hollow needle can be pressed out to puncture the rubber protective cover. After the rubber protective cover is punctured, the internal water flows out. At this time, air can enter the protector and enter the pressure measuring capillary, and the pressure is transmitted to the ground pressure measuring device. The lower end of the pressure measuring capillary penetrates the metal protective cover and the rubber protective cover through a one-way valve. After the rubber protective cover is filled with water, it is tightly connected with the metal protective cover as a whole. The lower end of the capillary is placed on the same horizontal line of the filter screen, so that the outer space of the rubber protective cover has a gap in the filter screen and it is easy to puncture. The outlet faces one side of the rubber protective cover, and the hollow needle is built in. After the pressure is applied, the rubber protective cover can be punctured. After the water inside the rubber protective cover flows out of the protector, it is connected to the outside through the filter screen. The rubber protective cover is closely connected to the metal protective cover, which can more effectively prevent the entry of external mud and other debris. The capillary is under the dual protection of the metal protective cover and the rubber protective cover, which is safer and less polluted.

[0066] In order to prevent the capillary probe from being damaged by collision with the well wall during the lowering process, and to prevent the capillary probe from being contaminated by mud during the cementing process, the safety of the capillary probe is improved. Figure 6 As shown, the present application provides another embodiment of a protector for a capillary probe. In this embodiment, the protector specifically includes the following contents:

[0067] A first protective sleeve 4 sleeved on the casing 3 and a second protective sleeve 5 sleeved on the first protective sleeve; a first through hole is formed in the second protective sleeve, the filter screen 2 is accommodated in the first through hole, both ends of the second protective sleeve and the first protective sleeve are hermetically connected to the casing, and a chamber is formed between the first protective sleeve and the second protective sleeve; the capillary probe 6 extends into the chamber, one end of the capillary probe is connected to the capillary 7, and the connection between the capillary and the chamber is hermetically connected; the gas in the coal seam outside the filter screen flows into the chamber through the filter screen.

[0068] Preferably, one end of the second protective sleeve and the first protective sleeve is hermetically connected to the casing through a first sealing plug 9, and the other end of the second protective sleeve and the first protective sleeve is hermetically connected to the casing through a second sealing plug 10. Both the first sealing plug and the second sealing plug can be metal threaded sealing plugs.

[0069] Preferably, the first protective sleeve is a hollow rubber protective sleeve, and water is contained in the body of the hollow rubber protective sleeve.

[0070] Preferably, a second through hole is formed in one end of the second protective sleeve, the capillary probe extends into the chamber through the second through hole, one end of the capillary probe is connected to the capillary, and the capillary is hermetically connected to the through hole through a one-way valve joint 8.

[0071] Specifically, the second protective sleeve can be a metal protective sleeve. The pressure-measuring capillary probe penetrates into the metal protective sleeve through a one-way valve. Outside the rubber protective sleeve, after the rubber protective sleeve is filled with water, it is closely connected to the metal protective sleeve. There is no requirement for the placement position of the capillary probe. The outlet of the capillary probe faces the side of the rubber protective sleeve and is communicated with the outside through the filter screen. The capillary is located inside the metal protective sleeve and outside the rubber protective sleeve, and there is not high requirement for the placement position of the end of the capillary, and the efficiency is higher.

[0072] In this application, specific embodiments are used to elaborate the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A protector for a capillary probe, characterized in that, it includes: a needle, a filter screen, a first protective sleeve sleeved on a sleeve, and a second protective sleeve sleeved on the first protective sleeve; a first through hole is provided on the second protective sleeve, the filter screen is accommodated in the first through hole, both ends of the second protective sleeve and the first protective sleeve are hermetically connected to the sleeve, and a chamber is formed between the first protective sleeve and the sleeve; the capillary probe extends into the chamber, one end of the capillary probe is connected to a capillary, the connection between the capillary and the chamber is hermetically connected, the other end of the capillary probe is provided with the needle, and the needle faces the inner side of the filter screen; when the protector is lowered to a specified coal seam outside the filter screen, gas is injected into the capillary probe through the capillary, and the gas pushes the needle out and pierces the first protective sleeve, and the gas in the specified coal seam flows into the chamber through the filter screen.

2. The protector for a capillary probe according to claim 1, characterized in that, the first protective sleeve is a hollow rubber protective sleeve, and water is contained in the body of the hollow rubber protective sleeve.

3. The protector for a capillary probe according to claim 1, characterized in that, the first protective sleeve and the second protective sleeve are in close contact with each other.

4. The protector for a capillary probe according to claim 1, characterized in that, the needle is a hollow needle; the hollow needle includes: a needle hub, a needle shaft and a needle tip connected in sequence; a channel is provided on the needle hub, and the needle tip faces the inner side of the filter screen.

5. The protector for a capillary probe according to claim 4, characterized in that, the hollow needle further includes: an aluminum metal film, and the aluminum metal film completely blocks the channel; when the protector is lowered to a specified coal seam outside the filter screen, the capillary injects gas into the capillary probe, and the gas pushes the needle out, pierces the first protective sleeve and breaks through the aluminum metal film.

6. The protector for a capillary probe according to claim 1, characterized in that, the capillary probe is L-shaped, and the turning point is arc-shaped.

7. The protector for a capillary probe according to claim 2, characterized in that, a second through hole is provided at one end of the second protective sleeve, a third through hole is provided at one end of the first protective sleeve, the capillary probe extends into the chamber through the second through hole and the third through hole in sequence, and the capillary is hermetically connected to the second through hole and the third through hole through a one-way valve joint.

8. The protector for a capillary probe according to claim 1, characterized in that, one end of the second protective sleeve and the first protective sleeve is hermetically connected to the sleeve through a first sealing plug, and the other end of the second protective sleeve and the first protective sleeve is hermetically connected to the sleeve through a second sealing plug.

9. The protector for a capillary probe according to claim 4, characterized in that, a plurality of fourth through holes are provided on the side wall of the needle shaft.

10. The protector for a capillary probe according to claim 1, characterized in that, the second protective sleeve is a metal protective sleeve.

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