A downhole sampling device for a well

Abstract

The application discloses a downhole sampling device for drilling, and belongs to the technical field of oil sampling. The probe mechanism and the lifting mechanism are arranged. When the shell is deep into a sampling point, a servo motor arranged in the shell and connected with a rotating ring at an output end is started to drive the rotating ring to rotate. A guide rod is sequentially slid along a first positioning groove to a lifting groove entrance. After entering the lifting groove, the guide rod is forced to move along the lifting groove channel and is lifted under the action of the inclined lifting groove channel. The guide rod drives a sliding table to ascend. The sliding table lifts a pull rod through a second clamping groove. Sampling is completed. The rotating ring continues to rotate, the guide rod is slid from the lifting groove into a second positioning groove, the guide rod is limited through the second positioning groove, the guide rod is kept axially fixed, the sliding table and the pull rod are locked, sample leakage caused by falling back is avoided, the servo motor is started at different points, multi-point and multi-chamber sampling is realized, and various samplers do not interfere with each other.

Description

Technical Field

[0001] This invention relates to the field of petroleum sampling technology, and more particularly to a drilling downhole sampling device. Background Technology

[0002] In oil drilling downhole fluid sampling operations, fluid sampling is a core technical means to determine the types, concentrations and proportions of various components of downhole fluids. Its analysis results directly serve to obtain key parameters such as oil-gas-water interface location, crude oil physical property characterization, natural gas component analysis, and formation pressure measurement, thereby providing data support for well control risk assessment, drilling fluid density optimization design, and reservoir dynamic change analysis.

[0003] In the existing technology, negative pressure sampling devices have become widely used fluid sampling tools in the oil drilling field due to their characteristic of extracting fluids using the principle of negative pressure. They create a negative pressure environment in the sampling chamber through manual operation (such as piston lifting and balloon rebound) or electric drive (such as vacuum pump and micro negative pressure pump), so that the fluid sample is sucked into the sampling container under atmospheric pressure, thereby realizing the sampling function. To avoid problems such as jamming and wear that may occur in complex mechanical structures, such as multi-cavity switching mechanisms, due to downhole vibration, high temperature or corrosive fluids, existing negative pressure sampling devices generally adopt a single-cavity structure design to reduce the failure rate by reducing the number of moving parts. However, in practical applications, downhole fluids generally exhibit stratification or concentration gradient distribution characteristics. To ensure that the collected samples can accurately reflect the fluid characteristics at different spatial locations, multi-point sampling or isokinetic sampling techniques are required to ensure sample homogeneity. When a single-chamber sampler performs multi-point fluid sampling tasks, it is necessary to change the sampling container or repeatedly operate the same sampling chamber to complete the sampling process. This can easily lead to the mixing of fluids at different points, thereby disrupting the original composition ratio of the sample. As a result, the collected sample cannot accurately characterize the fluid properties at each sampling point, affecting the subsequent analysis results. Summary of the Invention

[0004] The purpose of this invention is to address the problem that when a single-cavity sampler performs multi-point fluid sampling tasks, it is necessary to change the sampling container or repeatedly operate the same sampling cavity to complete the sampling process. This can easily lead to the mixing of fluids at different points, thereby disrupting the original composition ratio of the sample and making it impossible to accurately characterize the fluid characteristics of each sampling point, thus affecting the subsequent analysis results. Therefore, this invention proposes a drilling downhole sampling device.

[0005] To achieve the above objectives, the present invention employs the following technology: a drilling downhole sampling device. The sampler includes a negative pressure chamber and a sampling port at the bottom of the negative pressure chamber. A piston is filled in the sampling port, and a pull rod that penetrates the negative pressure chamber is connected to the top of the piston. The negative pressure chamber is mounted on a probe mechanism. The probe mechanism includes a housing, and at least two loading frames are arranged around the housing. The loading frames are movably connected to the outer wall of the housing through a translation mechanism. When the translation mechanism retracts, it drives the negative pressure chamber to move horizontally through the loading frame, so that the edge of the negative pressure chamber is embedded in the first slot opened on the surface of the shell, and the negative pressure chamber is fixed. The pull rod is lifted by an upward lifting mechanism installed on the top of the housing. The upward lifting mechanism includes a slide connected to the pull rod. A second slot is provided on the slide to fit into the edge of the pull rod. A guide rod is installed on the slide. A fixed ring is installed on the housing, and a rotating ring is rotatably arranged inside the fixed ring. The surface of the rotating ring is provided with a first positioning groove and a second positioning groove. The first positioning groove and the second positioning groove are connected by a lifting groove. The guide rod passes through the through groove opened on the surface of the fixed ring and is inserted into the first positioning groove. When the rotating ring rotates, the guide rod slides along the first positioning groove, enters the lifting groove and is then lifted, causing the slide table to pull the rod up for sampling. The sampling ends when the guide rod enters the second positioning groove.

[0006] As a further description of the drilling downhole sampling device described above: by replacing the rotating rings with different inclinations of the lifting groove, the lifting speed of the pull rod is adjusted, and the inclination range of the lifting groove is 30°-60°.

[0007] As a further description of the drilling downhole sampling device described above: the distance between the first positioning groove and the second positioning groove is the maximum distance the pull rod can be lifted. The lifting distance of the pull rod can be adjusted by replacing the rotating ring with a different distance between the first positioning groove and the second positioning groove.

[0008] As a further description of the drilling downhole sampling device described above: the lifting mechanism also includes a positioning plate surrounding the surface of the fixed ring, and a straight groove for the guide rod to pass through is provided in the middle of the positioning plate. The width of the straight groove is always the same as that of the first positioning groove, the second positioning groove and the lifting groove.

[0009] As a further description of the drilling downhole sampling device described above: the positioning plate is provided with a fitting strip, which slides into the mounting track opened on the surface of the fixing ring.

[0010] As a further description of the drilling downhole sampling device described above: the translation mechanism includes several mounting slots opened on the surface of the negative pressure chamber, and two hinge members are installed in the mounting slots. One end of a first hinge rod is hinged to the hinge member, and the other end of the first hinge rod is hinged to a pull rod. The pull rod is hinged to the hinge shafts installed on both sides of the loading frame.

[0011] As a further description of the drilling downhole sampling device described above: the translation mechanism also includes torsion springs wound around each hinge position.

[0012] As a further description of the drilling downhole sampling device described above: a 90° limiting groove is provided on the hinge member, and a limiting block that cooperates with the limiting groove is provided on the first hinge rod that is hinged to the hinge member.

[0013] As a further description of the drilling downhole sampling device of the above technology: the pull rod is embedded in the second slot by a first retaining ring provided at the end, and the first retaining ring is fixedly connected to the slide table by a locking mechanism; The locking mechanism includes an abutment portion disposed on the first retaining ring, and both the abutment portion and the slide table are provided with locking grooves; The first retaining ring has a rotating knob in the middle, and a semi-circular locking strip is provided on the knob.

[0014] As a further description of the drilling downhole sampling device described above: the probe mechanism also includes a penetrating part installed at the bottom of the housing and a connecting part installed at the top of the housing.

[0015] One of the above technical solutions has the following advantages or beneficial effects: 1. Through the probe mechanism and lifting mechanism, as the housing extends deeper into the sampling point, the servo motor, located inside the housing and connected to the rotating ring at its output end, is activated, driving the rotating ring to rotate. The guide rod slides sequentially along the first positioning groove to the entrance of the lifting groove. After entering the lifting groove, the guide rod is forced to move and lift along the lifting groove due to the inclination of the groove path. The guide rod drives the slide table to rise, and the slide table lifts the pull rod through the second slot, completing the sampling action. The rotating ring continues to rotate, causing the guide rod to slide from the lifting groove into the second positioning groove. The second positioning groove restricts the guide rod, keeping it axially fixed. The slide table and pull rod are locked, thus preventing sample leakage caused by falling back. By activating the servo motor at different points, multi-point, multi-chamber sampling can be achieved without interference between the samplers. 2. By using the set lifting groove and replacing the rotating ring with different inclinations of the lifting groove, the lifting speed of the pull rod can be adjusted. The inclination range of the lifting groove is 30°-60°, thereby adjusting the sampling speed. The distance between the first positioning groove and the second positioning groove is the maximum distance the pull rod can be lifted. By replacing the rotating ring with different distances between the first positioning groove and the second positioning groove, the lifting distance of the pull rod can be adjusted, thereby adjusting the sampling amount to meet different sampling requirements. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of a drilling downhole sampling device is shown; Figure 2 A first three-dimensional cross-sectional structural schematic diagram of the sampler and probe mechanism is shown; Figure 3 A second three-dimensional cross-sectional view of the sampler and probe mechanism is shown. Figure 4 A three-dimensional cross-sectional structural diagram of the probe mechanism and the lifting mechanism is shown; Figure 5 A three-dimensional structural diagram of the lifting mechanism is shown; Figure 6 A schematic diagram of the three-dimensional disassembled structure of the lifting mechanism is shown; Figure 7 A three-dimensional structural schematic diagram of the rotating ring is shown; Figure 8 A three-dimensional structural diagram of the slide table is shown; Figure 9 A three-dimensional structural diagram of the sampler performing sequential sampling via an upward lifting mechanism is shown; Figure 10 A schematic diagram of the first three-dimensional cross-sectional structure of the shell is shown; Figure 11 A schematic diagram of the second three-dimensional cross-sectional structure of the shell is shown; Figure 12 A three-dimensional structural diagram of the translation mechanism when it is deployed is shown; Figure 13 The hinge and; Figure 14 This diagram shows a partial three-dimensional structural schematic of the guide rod when it separates from the lifting mechanism via the translation mechanism; Figure 15 A three-dimensional structural schematic diagram of the locking mechanism is shown; Figure 16 A three-dimensional structural diagram of the knob and locking bar is shown; Figure 17 A three-dimensional cross-sectional structural diagram of the locking mechanism is shown.

[0017] Legend: 10. Sampler; 11. Negative pressure chamber; 12. Sampling port; 13. Piston; 14. Pull rod; 141. First retaining ring; 20. Probe mechanism; 21. Housing; 22. Penetrating part; 23. Connecting part; 24. Loading frame; 25. First slot; 251. Fitting ring; 30. Lifting mechanism; 31. Fixing ring; 311. Through groove; 312. Mounting rail; 32. Positioning piece; 321. Fitting strip; 322. Straight groove; 33. Rotating ring; 331. First positioning groove; 332. Second positioning groove; 333. Lifting groove; 34. Slide table; 35. Guide rod; 36. Second slot; 37. Servo motor; 40. Translation mechanism; 41. Mounting slot; 42. Hinge; 421. Limiting slot; 43. First hinge rod; 431. Limiting block; 44. Second hinge rod; 45. Hinge shaft; 46. Torsion spring; 50. Locking mechanism; 51. Abutting part; 52. Locking groove; 53. Knob; 54. Locking bar. Detailed Implementation

[0018] The following will describe in detail, with reference to the accompanying drawings of the embodiments of the present invention, a drilling downhole sampling device according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] To address the problem that when performing multi-point fluid sampling tasks with a single-cavity sampler, the sampling process often requires changing sampling containers or repeatedly operating the same sampling cavity, which can easily lead to mixing of fluids at different points. This can disrupt the original composition ratio of the sample, resulting in inaccurate characterization of the fluid properties at each sampling point and affecting subsequent analysis results. Therefore, this invention proposes a drilling downhole sampling device, such as... Figure 1 - Figure 17 As shown: The sampler 10 includes a negative pressure chamber 11 and a sampling port 12 at the bottom of the negative pressure chamber 11. A piston 13 is filled in the sampling port 12, and a pull rod 14 that penetrates the negative pressure chamber 11 is connected to the top of the piston 13. The negative pressure chamber 11 is mounted on a probe mechanism 20. The probe mechanism 20 includes a housing 21, and at least two loading frames 24 are arranged around the housing 21. Preferably, there are three loading frames 24. The probe mechanism 20 also includes a penetrating part 22 installed at the bottom of the housing 21 and a connecting part 23 installed at the top of the housing 21. A traction rope is connected through the connecting part 23 to drop the housing 21 to the sampling point and to penetrate the high viscosity crude oil layer through the penetrating part 22. The loading frame 24 is movably connected to the outer wall of the housing 21 via a translation mechanism 40. Preferably, the surface of the housing 21 is provided with an arc-shaped groove that matches the outer diameter of the loading frame 24. Figure 11 and Figure 12 As shown, the translation mechanism 40 includes several mounting slots 41 formed on the surface of the negative pressure chamber 11, and two hinge members 42 are installed in the mounting slots 41. One end of the first hinge rod 43 is hinged to the hinge member 42, and the other end of the first hinge rod 43 is hinged to the pull rod 14. The pull rod 14 is hinged to the hinge shafts 45 installed on both sides of the loading frame 24. like Figure 13As shown, when the sampler 10 needs to be installed, by pulling the loading frame 24, the loading frame 24 pulls the end of the second hinge rod 44 through the hinge shaft 45. The other end of the second hinge rod 44 pulls the first hinge rod 43 to rotate around the hinge member 42. The angle between the first hinge rod 43 and the second hinge rod 44 increases, causing the loading frame 24 to gradually move away from the housing 21. During this process, the torsion springs 46 set at each hinge position undergo elastic deformation. After obtaining enough space to load the sampler 10, the sampler 10 is inserted into the loading frame 24, and the sampler 10 is installed. Preferably, the translation mechanism 40 further includes torsion springs 46 wound around each hinge position. When the loading frame 24 is released, the loading frame 24 quickly resets and re-fits the housing 21 under the action of the elastic deformation recovery of the torsion springs 46. Furthermore, in order to limit the movement direction of the loading frame 24, a 90° limiting groove 421 is provided on the hinge member 42, and a limiting block 431 that cooperates with the limiting groove 421 is provided on the first hinge rod 43 that is hinged to the hinge member 42. The cooperation between the limiting groove 421 and the limiting block 431 limits the rotation range of the first hinge rod 43, so that it can only rotate within a 90° range, thereby preventing the loading frame 24 from generating vertical displacement, thereby achieving the purpose of limiting the horizontal movement of the loading frame 24. When the translation mechanism 40 retracts, it drives the negative pressure chamber 11 to move horizontally via the loading frame 24, causing the edge of the negative pressure chamber 11 to embed into the first slot 25 opened on the surface of the housing 21, thus completing the fixing of the negative pressure chamber 11. Figure 10 and Figure 11 As shown, in order to prevent the loading frame 24 from becoming loose, a fitting ring 251 that rotatably engages with the edge of the negative pressure chamber 11 is also provided at the first slot 25. After the edge of the negative pressure chamber 11 is inserted into the first slot 25, the negative pressure chamber 11 is locked by rotating the fitting ring 251, so that it cannot be moved out of the first slot 25, thereby further fixing the loading frame 24.

[0020] like Figure 4 - Figure 9As shown, the pull rod 14 is lifted by the lifting mechanism 30 installed on the top of the housing 21. The lifting mechanism 30 includes a slide 34 connected to the pull rod 14. The slide 34 has a second slot 36 that fits into the edge of the pull rod 14. A guide rod 35 is installed on the slide 34. A fixing ring 31 is installed on the housing 21. A rotating ring 33 is rotatably arranged inside the fixing ring 31. The surface of the rotating ring 33 has a first positioning groove 331 and a second positioning groove 332. The first positioning groove 331 and the second positioning groove 332 are connected by a lifting groove 333. The guide rod 35 passes through the through groove 311 opened on the surface of the fixing ring 31 and is inserted into the first positioning groove 331. At this time, the slide 34 is in the lowest position. The first positioning groove 331 ensures that the slide 34 does not undergo axial displacement when it is in this position. The pull rod 14 is not lifted, and the sampler 10 is in a standby state. It should be noted that the sampler 10 is not installed on the side near the lifting groove 333. As the housing 21 extends deeper into the sampling point, the servo motor 37, which is located inside the housing 21 and whose output end is connected to the rotating ring 33, is activated to drive the rotating ring 33 to rotate. The guide rod 35 slides along the first positioning groove 331 to the entrance of the lifting groove 333. After entering the lifting groove 333, the guide rod 35 is forced to move and be lifted along the lifting groove 333 due to the inclination of the groove path. The guide rod 35 drives the slide table 34 to rise. The slide table 34 lifts the rod 14 through the second slot 36 to complete the sampling action. By activating the servo motor 37 at different points, multi-point multi-chamber sampling can be achieved, and the samplers 10 do not interfere with each other. The rotating ring 33 continues to rotate, causing the guide rod 35 to slide from the lifting groove 333 into the second positioning groove 332. The guide rod 35 is restricted by the second positioning groove 332, keeping the guide rod 35 axially fixed. The slide table 34 and the pull rod 14 are locked, thereby preventing sample leakage caused by falling back. Preferably, by replacing the rotating ring 33 with different inclinations of the lifting groove 333, the lifting speed of the pull rod 14 can be adjusted. The inclination range of the lifting groove 333 is 30°-60°, thereby adjusting the sampling speed. The distance between the first positioning groove 331 and the second positioning groove 332 is the maximum distance the pull rod 14 can be lifted. By replacing the rotating ring 33 with different distances between the first positioning groove 331 and the second positioning groove 332, the lifting distance of the pull rod 14 can be adjusted, thereby adjusting the sampling amount to meet different sampling requirements.

[0021] Furthermore, to avoid differences in width between the first positioning groove 331, the second positioning groove 332, and the lifting groove 333 on the replacement rotating ring 33 and the through groove 311, such as Figure 6As shown, the lifting mechanism 30 also includes a positioning piece 32 surrounding the surface of the fixed ring 31. The positioning piece 32 has a straight groove 322 in the middle for the guide rod 35 to pass through. The width of the straight groove 322 is always the same as that of the first positioning groove 331, the second positioning groove 332 and the lifting groove 333. The positioning piece 32 is provided with a fitting strip 321, which slides into the mounting track 312 opened on the surface of the fixing ring 31. By replacing the guide rod 35 that cooperates with the straight groove 322, the first positioning groove 331, the second positioning groove 332 and the lifting groove 333, and installing the positioning piece 32 on the fixing ring 31, the through groove 311 on the fixing ring 31 can provide initial radial restriction on the guide rod 35, while the straight groove 322 further constrains the radial displacement of the guide rod 35, eliminating the radial degree of freedom of the guide rod 35. This is suitable for high-load scenarios when collecting high-viscosity samples.

[0022] like Figure 14 - Figure 17 As shown, in order to quickly replace the positioning piece 32, the pull rod 14 is inserted into the second slot 36 through the first retaining ring 141 at the end. The first retaining ring 141 is fixedly connected to the slide table 34 through the locking mechanism 50. The locking mechanism 50 includes an abutting part 51 provided on the first retaining ring 141. Both the abutting part 51 and the slide table 34 are provided with locking slots 52. A knob 53 is rotatably provided in the middle of the first retaining ring 141. A semi-circular locking strip 54 is provided on the knob 53. When the sampler 10 is installed, the translation mechanism 40 retracts and is inserted into the second slot 36 through the loading frame 24 with the first retaining ring 141. At this time, the locking bar 54 rotates completely and is stored in the locking slot 52 opened on the abutment part 51, so as to avoid the locking bar 54 interfering with the abutment of the slide table 34 and the abutment part 51. When the rotating ring 33 needs to be replaced, the knob 53 is rotated so that the knob 53 drives the locking bar 54 to simultaneously engage in the locking groove 52 opened on the abutment part 51 and the slide table 34. The slide table 34 is fixedly connected to the abutment part 51. At this time, the translation mechanism 40 is unfolded so that the slide table 34 drives the guide rod 35 to move together with the first retaining ring 141. The guide rod 35 can be moved out of the first positioning groove 331, thereby avoiding the situation where the guide rod 35 restricts the position of the rotating ring 33 and makes it impossible to replace.

[0023] Working principle: Pull the loading frame 24 so that it pulls the second hinge rod 44 through the hinge shaft 45. The second hinge rod 44 pulls the first hinge rod 43 to rotate around the hinge 42. The angle between the first hinge rod 43 and the second hinge rod 44 increases, and the loading frame 24 moves away from the housing 21. During this process, the torsion spring 46 undergoes elastic deformation. After obtaining sufficient space, the sampler 10 is inserted into the loading frame 24. When the loading frame 24 is released, under the elastic deformation recovery action of the torsion spring 46, the loading frame 24 quickly resets and re-fits the housing 21; The translation mechanism 40 retracts, and the loading frame 24 drives the negative pressure chamber 11 to move horizontally, so that the edge of the negative pressure chamber 11 is embedded into the first slot 25 on the surface of the housing 21, and the locking ring 251 is rotated to lock the negative pressure chamber 11. The shell 21 is deployed to the sampling point by connecting the traction rope through the connecting part 23, and the penetrating part 22 penetrates the high viscosity crude oil layer. The guide rod 35 passes through the through groove 311 of the fixed ring 31 and is inserted into the first positioning groove 331 of the rotating ring 33. At this time, the slide table 34 is at its lowest position, the pull rod 14 is not lifted, and the sampler 10 is in standby state. Note that the sampler 10 is not set on the side near the lifting groove 333. The servo motor 37 inside the housing 21 is activated, driving the rotating ring 33 to rotate. The guide rod 35 slides along the first positioning groove 331 to the entrance of the lifting groove 333. After entering the lifting groove 333, it is forced to move and lift under the tilting action of the groove, which drives the slide table 34 to rise. The slide table 34 lifts the rod 14 through the second slot 36 to complete the sampling action. As the rotating ring 33 continues to rotate, the guide rod 35 slides from the lifting groove 333 into the second positioning groove 332. The guide rod 35 is restricted by the second positioning groove 332, thereby locking the slide table 34 and the pull rod 14 to prevent sample leakage.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technology of the present invention and the inventive concept of the drilling downhole sampling device, should be covered within the scope of protection of the present invention.

Claims

1. A drilling downhole sampling device, comprising a sampler (10), the sampler (10) including a negative pressure chamber (11) and a sampling port (12) opened at the bottom of the negative pressure chamber (11), a piston (13) being filled in the sampling port (12), and a pull rod (14) penetrating the negative pressure chamber (11) being connected to the top of the piston (13), characterized in that, The negative pressure chamber (11) is installed on the probe mechanism (20). The probe mechanism (20) includes a housing (21). At least two loading racks (24) are arranged around the housing (21), and the loading racks (24) are movably connected to the outer wall of the housing (21) through a translation mechanism (40). When the translation mechanism (40) retracts, it drives the negative pressure chamber (11) to move horizontally through the loading frame (24), so that the edge of the negative pressure chamber (11) is embedded in the first slot (25) opened on the surface of the shell (21), and the negative pressure chamber (11) is fixed. The pull rod (14) is lifted by the lifting mechanism (30) installed on the top of the housing (21). The lifting mechanism (30) includes a slide (34) connected to the pull rod (14). A second slot (36) is provided on the slide (34) to fit into the edge of the pull rod (14). A guide rod (35) is installed on the slide (34). A fixing ring (31) is installed on the housing (21). A rotating ring (33) is rotatably arranged inside the fixing ring (31). A first positioning groove (331) and a second positioning groove (332) are opened on the surface of the rotating ring (33). The first positioning groove (331) and the second positioning groove (332) are connected by a lifting groove (333). A guide rod (35) passes through the through groove (311) opened on the surface of the fixing ring (31) and is inserted into the first positioning groove (331). When the rotating ring (33) rotates, the guide rod (35) slides along the first positioning groove (331), enters the lifting groove (333) and is lifted, so that the slide table (34) pulls the pull rod (14) up to perform sampling. The guide rod (35) enters the second positioning groove (332) and the sampling ends.

2. The drilling downhole sampling device according to claim 1, characterized in that, By replacing the rotating ring (33) with different inclinations of the lifting groove (333), the lifting speed of the pull rod (14) is adjusted, and the inclination range of the lifting groove (333) is 30°-60°.

3. A drilling downhole sampling device according to claim 2, characterized in that, The distance between the first positioning groove (331) and the second positioning groove (332) is the maximum distance that the pull rod (14) can be lifted. The lifting distance of the pull rod (14) can be adjusted by replacing the rotating ring (33) with a different distance between the first positioning groove (331) and the second positioning groove (332).

4. A drilling downhole sampling device according to claim 3, characterized in that, The lifting mechanism (30) also includes a positioning piece (32) surrounding the surface of the fixed ring (31). The positioning piece (32) has a straight groove (322) in the middle for the guide rod (35) to pass through. The width of the straight groove (322) is always the same as that of the first positioning groove (331), the second positioning groove (332) and the lifting groove (333).

5. A drilling downhole sampling device according to claim 4, characterized in that, The positioning piece (32) is provided with a fitting strip (321), which slides into the mounting track (312) opened on the surface of the fixing ring (31).

6. A drilling downhole sampling device according to claim 1, characterized in that, The translation mechanism (40) includes several mounting slots (41) formed on the surface of the negative pressure chamber (11), and two hinge members (42) are installed in the mounting slots (41). One end of a first hinge rod (43) is hinged to the hinge member (42), and the other end of the first hinge rod (43) is hinged to a pull rod (14). The pull rod (14) is hinged to the hinge shafts (45) installed on both sides of the loading frame (24).

7. A drilling downhole sampling device according to claim 6, characterized in that, The translation mechanism (40) also includes torsion springs (46) wound around each hinge position.

8. A drilling downhole sampling device according to claim 6, characterized in that, The hinge (42) has a 90° limiting groove (421), and the first hinge rod (43) that is hinged to the hinge (42) has a limiting block (431) that cooperates with the limiting groove (421).

9. A drilling downhole sampling device according to claim 6, characterized in that, The pull rod (14) is embedded in the second slot (36) through the first retaining ring (141) provided at the end, and the first retaining ring (141) is fixedly connected to the slide table (34) through the locking mechanism (50); The locking mechanism (50) includes an abutment (51) provided on the first retaining ring (141), and locking grooves (52) are provided on both the abutment (51) and the slide (34). The first retaining ring (141) has a rotating knob (53) in the middle, and a semi-circular locking strip (54) is provided on the knob (53).

10. A drilling downhole sampling device according to any one of claims 1-9, characterized in that, The probe mechanism (20) also includes a penetrating part (22) installed at the bottom of the housing (21) and a connecting part (23) installed at the top of the housing (21).

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