Sealed drilling sampling method and system

Abstract

The present invention discloses a sealed drilling sampling method and system, which relates to the technical field of sealed space sampling. The key points of the technical solution are: comprising a leak detection device, a sealing device, a conduit device and a penetration device; the end of the leak detection device is connected to the end flange of the sealing device, and the sealing device is located inside the leak detection device; the conduit device passes through the sealing device and its two ends are respectively located inside and outside the leak detection device; the penetration device passes through the conduit device and its two ends are respectively located inside and outside the leak detection device, and the penetration device is flange-connected to the conduit device; the sealing device is injected with sealing oil. In response to the current urgent need for confined space drilling sampling technology, a closed drilling sampling device is constructed based on the oil sealing principle, and a new confined space drilling sampling method and system is proposed to improve the safety of the confined space sampling process and provide technical equipment support for subsequent confined space disposal methods.

Description

Technical Field

[0001] The present invention relates to the technical field of sealed space sampling, and more particularly to a sealed drilling sampling method and system. Background Art

[0002] When the gas composition in a closed chamber is unpredictable, sampling and analysis are necessary for subsequent disposal. Therefore, a sealed drilling sampling method and system is needed. Currently, drilling sampling is mostly focused on surface soil. Drilling machinery is often developed based on soil mechanics theory and geotechnical drilling engineering. For example, the soil sampling device, which consists of rotary and feed motors, hollow external auger tools, and auxiliary equipment, rarely considers the sealing requirements during the sampling process.

[0003] There are two main shortcomings in drilling and sampling analysis of sealed air chambers:

[0004] First, there is a lack of research on sealed drilling power mechanical systems. Existing methods and products all directly drill to achieve the purpose of sampling, without systematically analyzing the combination of power drilling structure and sealing requirements.

[0005] Secondly, there is a lack of research on sampling structures under high sealing methods. Ordinary sampling methods are mostly studied from a mechanical perspective and are difficult to apply. Summary of the Invention

[0006] The purpose of the present invention is to provide a sealed drilling sampling method and system. In response to the urgent need for confined space drilling sampling technology, based on the oil sealing principle, a closed drilling sampling device is constructed, and a new confined space drilling sampling method and system are proposed to improve the safety of the confined space sampling process and provide technical equipment support for subsequent disposal methods of the confined space.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a sealed drilling sampling system, including a leak detection device, a sealing device, a catheter device and a penetration device; the end of the leak detection device is connected to the end flange of the sealing device, and the sealing device is located inside the leak detection device; the catheter device passes through the sealing device and its two ends are respectively located inside and outside the leak detection device; the penetration device passes through the catheter device and its two ends are respectively located inside and outside the leak detection device, and the penetration device is flange-connected to the catheter device; the sealing device is filled with sealing oil.

[0008] Furthermore: the leak detection device includes a vertical cylindrical leak detection tank body, a vacuum port and a helium filling interface; the vacuum port and the helium filling interface are both installed on the side wall of the leak detection tank body and communicate with the internal chamber of the leak detection tank body.

[0009] Further: the sealing device includes a vertical cylindrical sealing shell, a sampling tube and two shaft seals; one end of the sealing shell is located in the leak detection tank body, and the other end of the sealing shell is connected to the end flange of the leak detection tank body, and both ends of the sealing shell are provided with sealing interfaces, and both ends of the sealing shell are fixedly provided with sealing flanges three connected to the sealing interfaces; the two shaft seals are respectively fixedly installed in the two sealing interfaces; the conduit device passes through the two sealing interfaces, and the side wall of the conduit device is movably connected to the shaft seal; the sampling tube is arranged on the sealing shell, and the detection end of the sampling tube is located in the detection tank body for detecting the gas in the detection tank body; sealing oil is injected into the sealing shell.

[0010] Furthermore: the catheter device includes a vertical cylindrical catheter; one end of the catheter is located outside the detection tank body, and the other end of the catheter passes through two sealing interfaces and is located inside the detection tank body; the outer wall of the catheter is movably connected to the shaft seal in the sealing interface.

[0011] Furthermore: the penetration device includes a drill body and a cutter head; the cutter head is fixedly connected to the drill body, and the drill body and the catheter are connected via a flange.

[0012] A sealed drilling sampling method specifically comprises the following steps:

[0013] S1: Build a gas leak detection device;

[0014] S2: Build a sealing device;

[0015] S3: build the catheter device;

[0016] S4: Build the penetration device;

[0017] S5: Assemble the leak detection device, sealing device, conduit device and penetration device and perform leak detection.

[0018] Further: the specific steps of S1 are:

[0019] 1) Select the material and structure of the leak detection device;

[0020] 2) Processing the leak detection device;

[0021] 3) Select the components used by the interface.

[0022] Further: the specific steps of S2 are:

[0023] 1) Choose sealed cavity form;

[0024] 2) Select the cavity flange material and surface treatment process;

[0025] 3) Design sealing device.

[0026] Further: The specific steps of S3 are:

[0027] 1) Select the catheter structure and molding form;

[0028] 2) Select the material and surface treatment process of the conduit and flange.

[0029] Further: the specific steps of S4 are:

[0030] 1) Select the same material for the drill body, drill bit and sealing flange;

[0031] 2) Choose a drill bit;

[0032] 3) Design the drill body cutting structure.

[0033] In summary, the present invention has the following beneficial effects:

[0034] 1. A sealed drilling and sampling device was built to eliminate the risk of leakage during the drilling process, thereby improving the safety of the operation process;

[0035] 2. A closed space drilling and sampling system is designed based on a sealed structure, which greatly improves the safety of the sampling process, ensures the safety of sampling, and avoids the leakage of dangerous gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of a sealed drilling sampling system in Example 1 of the present invention;

[0037] Figure 2 1 is a schematic structural diagram of a leak detection device in Example 1 of the present invention;

[0038] Figure 3 is a schematic structural diagram of the sealing device in Example 1 of the present invention;

[0039] Figure 4 is a schematic structural diagram of the catheter device in Example 1 of the present invention;

[0040] Figure 5 It is a schematic structural diagram of the penetration device in Example 1 of the present invention.

[0041] In the figure: 1. Leak detection tank body; 2. Vacuum port; 3. Helium filling interface; 4. Sealing shell; 5. Sealing flange 1; 6. Cavity flange; 7. Sealing flange 3; 8. Conduit flange; 9. Sealing flange 2; 10. Shaft seal; 11. Sealing oil; 12. Drill body; 13. Conduit; 14. Cutter head; 15. Sampling tube; 16. Conduit pressure plate fixing hole; 17. Sealing interface. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-5The present invention is described in further detail.

[0043] Example 1: A sealed drilling sampling system, such as Figures 1 to 5 As shown, it includes a leak detection device, a sealing device, a catheter device and a penetration device; the end of the leak detection device is connected to the end flange of the sealing device, and the sealing device is located inside the leak detection device; the catheter device passes through the sealing device and its two ends are respectively located inside and outside the leak detection device; the penetration device passes through the catheter device and its two ends are respectively located inside and outside the leak detection device, and the penetration device is flange-connected to the catheter device; sealing oil 11 is injected into the sealing device.

[0044] The leak detection device includes a vertical cylindrical leak detection tank body 1, a vacuum port 2 and a helium filling interface 3; Figure 2 As shown, a sealing flange 5 is installed at the top of the leak detection tank body 1; the vacuum port 2 and the helium filling interface 3 are both installed on the side wall of the leak detection tank body 1 and connected to the internal chamber of the leak detection tank body 1; the leak detection tank body 1 is made of 316L stainless steel, and the surface is electrolytically mirror polished; the connector of the vacuum port 2 and the connector of the helium filling interface 3 both use KF25 flanges.

[0045] The sealing device includes a vertical cylindrical sealing shell 4, a sampling tube 15 and two shaft seals 10; Figure 3 As shown, one end of the sealing shell 4 is located in the leak detection tank 1, and two cavity flanges 6 are fixed on the top of the sealing shell 4. The cavity flange 6 on the sealing shell 4 corresponds to and is connected to the sealing flange 5 on the leak detection tank 1; the sealing shell 4 and the cavity flange 6 are both made of 316L stainless steel, and the surface is electrolytically mirror polished; sealing interfaces are opened at both ends of the sealing shell 4, and two shaft seals 10 are fixedly installed in the two sealing interfaces respectively; sealing flanges 7 connected to the sealing interfaces are fixedly installed on the outer walls of both ends of the sealing shell 4; the conduit device passes through the two sealing interfaces, and the side walls of the conduit device are connected to the sealing interfaces. The shaft seal 10 is movably connected; the sampling tube 15 is arranged on the sealing shell 4, and the detection end of the sampling tube 15 is located in the detection tank body for detecting the gas in the detection tank body; the sealing shell 4 is injected with sealing oil 11, and the sealing oil 11 can prevent the internal gas from entering the atmosphere, and at the same time can lubricate the relatively moving parts, reduce the wear of the sealing ring and the shaft seal 10, and avoid leakage caused by wear; in addition, the sealing oil 11 rotates and moves with the catheter device in the cavity, which can reduce the temperature of the sealing ring and the shaft seal 10 caused by the rotation; the shaft seal 10 adopts the NY pressure-resistant shaft seal 10, which has a maximum pressure resistance of 3Mpa.

[0046] The catheter device includes a vertical cylindrical catheter 13; Figure 4As shown, one end of the conduit 13 is located outside the detection tank body, and the other end of the conduit 13 passes through two sealing interfaces and is located inside the detection tank body. A conduit flange 8 is fixedly installed on the end located outside the detection tank body; a conduit pressure plate fixing hole 16 is opened on the end of the conduit 13 located inside the detection tank body; the outer wall of the conduit 13 is rotatably connected to the shaft seal 10 in the sealing interface; the conduit 13 and the conduit flange 8 are both made of 316L stainless steel, and the surface is electrolytically mirror polished.

[0047] The penetration device includes a drill body 12 and a cutter head 14; the cutter head 14 is fixedly connected to the drill body 12, and a sealing flange 9 is fixedly installed on the side wall of the drill body 12, and the sealing flange 9 is matched with and connected to the catheter flange 8; the cutter head 14 adopts a four-edged hard composite alloy cutter head 14, and the drill body 12 adopts a four-slot cutting; the diameter of the entire penetration device is 10mm and the length is 700mm.

[0048] Example 2: A sealed drilling sampling method, comprising the following steps:

[0049] S1: Build a gas leak detection device to detect leaks in the closed drilling system before work to ensure absolute safety during the work process;

[0050] S2: Build a sealing device;

[0051] S3: build the catheter device;

[0052] S4: Build the penetration device;

[0053] S5: Assemble the leak detection device, sealing device, conduit device and penetration device and perform leak detection.

[0054] The specific steps of S1 are:

[0055] 1) Select the material and structure of the leak detection device; use 316L stainless steel to construct a vertical cylindrical structure, install a sealing flange on the top, and leave a vacuum port and helium filling interface on the side;

[0056] 2) Process the leak detection device; the surface is electrolytically mirror polished, and the processing process includes degreasing, cleaning, high-temperature baking degassing, and ultrasonic cleaning;

[0057] 3) Select the components used for the interface; the vacuum pump interface component model and the helium filling port component model are both KF25.

[0058] The specific steps of S2 are:

[0059] 1) Use a sealed chamber form; adopt a vertical cylindrical structure, the needle body is tungsten-arc welded, a sealing flange is provided on the top, and sealing interfaces and gas sampling tubes are left at both ends;

[0060] 2) Select the cavity flange material and surface treatment process; the cavity flange is made of 316L stainless steel, and the surface treatment process includes surface electrolytic mirror polishing, degreasing, cleaning, high-temperature baking degassing, and ultrasonic cleaning.

[0061] 3) Design the sealing device. The specific steps are as follows:

[0062] Step 1: First, evenly distribute the 6 diameter through holes for installation and fixing;

[0063] Step 2: A sealing groove is machined at the bottom of the flange for gas sealing. The sealing groove is designed according to the national standard GB1235-76;

[0064] Step 3: A sampling tube is welded on the side of the sealing device for internal gas detection;

[0065] Step 4: Select 26-type fluororubber as the sealing material. 26-type fluororubber has a tensile strength of up to 17.2MPa, an elongation of 150-300%, a hardness of 70-85, a tear strength of 25-40N / m, and a long-term operating temperature of up to 250°C. It is stable to some solvents and oils, and is resistant to strong oxidizing inorganic acids such as fuming nitric acid, ozone, and radiation.

[0066] Step 5: The cavity is filled with sealing oil imported from Germany. This seals the gaps between relatively moving parts and lubricates them, reducing wear on the seals and shaft seals and preventing leakage caused by wear. The oil moves within the cavity as the conduit rotates, reducing the temperature of the seals and shaft seals caused by rotation. It is corrosion-resistant, anti-oxidant, and chemically stable.

[0067] Step 6: Use NY pressure-resistant shaft seal for the shaft seal; its pressure resistance is 3Mpa and it can be used under high pressure conditions. The sealing method is double-lip seal, which has higher sealing performance. The outer lip has a dust-proof function to prevent dust from entering the cavity or damaging the inner lip of the shaft seal.

[0068] The specific steps of S3 are:

[0069] 1) Select the catheter structure and forming form; adopt a vertical cylindrical structure, and the whole is made of bar material to ensure its straightness and jump;

[0070] 2) Selection of catheter and flange materials and surface treatment: The catheter and flange are made of 316L stainless steel, and the surface is electrolytically mirror polished. The treatment process mainly includes degreasing, cleaning, high-temperature baking and degassing, and ultrasonic cleaning. The process is rough machining inside and outside → finishing → grinding → fine grinding → degreasing and cleaning → electrolytic polishing → high-temperature baking and degassing → ultrasonic cleaning. The final catheter has a circular runout of ≤0.01mm, a straightness of ≤0.01mm, and a surface roughness better than 0.8.

[0071] The specific steps of S4 are:

[0072] 1) Select the same material for the drill body, drill bit and sealing flange; the drill body is made of tungsten steel, the cutter head is made of hard composite alloy with the characteristics of not being afraid of impact, vibration and high wear resistance, and the drill bit sealing flange is made of tungsten steel;

[0073] 2) Select a drill bit; the bit is a four-edged bit with sharp and wear-resistant properties, which can drill reinforced concrete;

[0074] 3) Design the chip removal structure of the drill body; adopt four-slot chip removal, which can quickly remove chips and avoid drill jamming.

[0075] Working principle: Install the gas analysis module (sealing device, catheter device and penetration device) on the leak detection device, use a vacuum pump to evacuate the leak detection device, fill the leak detection device with helium, use a helium mass spectrometer leak detector to detect leaks, and remove it after passing the test; install the gas analysis module on the insulator, seal and fix the analysis module (fixation can be in the form of expansion bolts), and check whether there are any abnormal conditions such as jamming in the moving parts; then use an imported electric hammer to clamp the penetration device, start the electric hammer and move it up and down, check for any abnormal conditions, and use the device to penetrate the insulator after checking that there are no abnormalities (the thickness of the insulator shall not exceed 150mm); finally, open the sampling tube valve, perform data analysis on the gas in the insulator, and after the analysis is completed, use professional equipment to seal and cut off the sampling tube, and finally perform a safety seal on the gas analysis module as a whole.

[0076] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A sealed drilling sampling system, characterized by: The invention comprises a leak detection device, a sealing device, a conduit device and a penetration device; the end of the leak detection device is connected to the end flange of the sealing device, and the sealing device is located inside the leak detection device; the conduit device passes through the sealing device, and the two ends are respectively located inside and outside the leak detection device; the penetration device passes through the conduit device, and the two ends are respectively located inside and outside the leak detection device, and the penetration device is connected to the conduit device flange; the sealing device is filled with sealing oil (11); The leak detection device comprises a vertical cylindrical leak detection tank body (1), a vacuum port (2) and a helium filling interface (3); the vacuum port (2) and the helium filling interface (3) are both installed on the side wall of the leak detection tank body (1) and communicate with the internal chamber of the leak detection tank body (1); The sealing device comprises a vertical cylindrical sealing shell (4), a sampling tube (15) and two shaft seals (10); one end of the sealing shell (4) is located in the leak detection tank (1), and the other end of the sealing shell (4) is connected to the end flange of the leak detection tank (1), and both ends of the sealing shell (4) are provided with sealing interfaces, and both ends of the sealing shell (4) are fixedly provided with sealing flanges (7) that are in communication with the sealing interfaces; the two shaft seals (10) are respectively fixedly installed in the two sealing interfaces; the conduit (13) device passes through the two sealing interfaces, and the side wall of the conduit (13) device is movably connected to the shaft seal (10); the sampling tube (15) is arranged on the sealing shell (4), and the detection end of the sampling tube (15) is located in the detection tank for detecting gas in the detection tank; the sealing shell (4) is injected with sealing oil (11); The penetration device comprises a drill body (12) and a cutter head (14); the cutter head (14) is fixedly connected to the drill body (12), and the drill body (12) is connected to the guide tube (13) via a flange.

2. A sealed drilling sampling system according to claim 1, characterized in that: The catheter device comprises a vertical cylindrical catheter (13); one end of the catheter (13) is located outside the detection tank body, and the other end of the catheter (13) passes through two sealing interfaces and is located inside the detection tank body; the outer side wall of the catheter (13) is movably connected to the shaft seal (10) in the sealing interface.

3. A sealed drilling sampling method, wherein the sealed drilling sampling system of claim 1 or 2 is used, characterized in that: The specific steps include: S1: Build a gas leak detection device; S2: Build a sealing device; S3: build the catheter device; S4: Build the penetration device; S5: Assemble the leak detection device, sealing device, conduit device and penetration device and perform leak detection.

4. A sealed drilling sampling method according to claim 3, characterized in that: The specific steps of S1 are: 1) Select the material and structure of the leak detection device; 2) Carry out process treatment on the leak detection device; 3) Select the components used by the interface.

5. A sealed drilling sampling method according to claim 3, characterized in that: The specific steps of S2 are: 1) Choose sealed cavity form; 2) Select the cavity flange material and surface treatment process; 3) Design sealing device.

6. A sealed drilling sampling method according to claim 3, characterized in that: The specific steps of S3 are: 1) Select the catheter structure and molding form; 2) Select the material and surface treatment process of the conduit and flange.

7. The sealed drilling sampling method according to claim 3, characterized in that: The specific steps of S4 are: 1) Select the same material for the drill body, cutter head and sealing flange; 2) Select the cutter head; 3) Design the drill body cutting structure.

Images