A sampling device and sampling method

Abstract

This application discloses a sampling device and method. The sampling device includes a lifting assembly, a sampling assembly, a rotary cutting assembly, and an opening and closing assembly. The sampling assembly is connected to the lifting end of the lifting assembly. The sampling assembly includes a driving component and a drill rod, with the drill rod connected to the driving end of the driving component. The rotary cutting assembly includes an arc-shaped cutter disposed inside the drill rod. The arc-shaped cutter can rotate around the central axis of the drill rod to perform multi-segment transverse cutting of the hydrate drilled inside the drill rod. The opening and closing assembly is connected to both the drill rod and the rotary cutting assembly. When the arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, the opening and closing assembly drives the drill rod to unfold, providing sampling. The sampling device of this application can effectively distinguish and independently sample hydrates at different depth ranges, facilitating rapid sampling of segmented hydrates by staff and improving sampling efficiency.

Description

Technical Field

[0001] This application relates to the field of drilling and sampling technology, and in particular to a sampling device and sampling method. Background Technology

[0002] Hydrates, as a potentially important energy resource, are widely distributed in deep-sea areas. Accurate sampling and analysis of hydrates are crucial for understanding their properties, distribution patterns, and development and utilization. During hydrate drilling, specialized sampling equipment and methods are required to obtain high-quality hydrate samples for subsequent research. Existing hydrate drilling sampling technologies can meet basic sampling needs to a certain extent. Different types of sampling equipment have their own characteristics in structural design and working principles, and some methods are adaptable to different geological conditions and drilling environments.

[0003] However, traditional techniques mostly involve drilling directly with a drill rod and then extracting the material from the inner cavity of the drill rod. During extraction, due to the limited space and relatively simple structure of the inner cavity of the drill rod, workers need to use special tools to go deep into the drill rod. The operating space is narrow, the process is complicated and time-consuming, or automated auxiliary tools are used to extract the sample from the inner cavity of the drill rod. However, most of these methods cannot effectively distinguish and independently sample hydrates in different depth ranges. Summary of the Invention

[0004] This application aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the purpose of this application is to provide a sampling device capable of effectively distinguishing and independently sampling hydrates at different depth ranges, facilitating rapid sampling of segmented hydrates by staff, and improving sampling efficiency.

[0005] This application also proposes a sampling method using the above-described sampling device.

[0006] The sampling apparatus according to a first aspect embodiment of this application includes:

[0007] Lifting components;

[0008] A sampling component is provided, which is connected to the lifting end of the lifting component. The sampling component includes a driving component and a drill rod, and the drill rod is connected to the driving end of the driving component.

[0009] A rotary cutting assembly, comprising an arc-shaped cutter disposed inside the drill rod, the arc-shaped cutter being rotatable around the central axis of the drill rod to perform multi-segment transverse cutting of the hydrate drilled inside the drill rod;

[0010] An opening and closing assembly is connected to both the drill rod and the rotary cutting assembly. When the arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, the opening and closing assembly causes the drill rod to unfold to provide sampling.

[0011] The sampling device according to the embodiments of this application has at least the following beneficial effects: An arc-shaped cutter is disposed inside the drill rod, and the arc-shaped cutter can rotate around the central axis of the drill rod to perform multi-segment transverse cutting of the hydrates drilled inside the drill rod, thereby achieving differentiation of hydrates at different depths. Furthermore, when the arc-shaped cutter rotates to a first preset position, the opening and closing component causes the drill rod to unfold, eliminating the need for personnel to use special tools to penetrate deep into the drill rod, and eliminating the need to rely on complex automated auxiliary tools to extract samples, facilitating independent sampling of hydrates at different depths. In addition, after cutting, the drill rod unfolds in half, and the arc-shaped cutter can also serve as a bottom support to receive the cut hydrate samples, facilitating rapid sampling of the segmented hydrates by personnel and improving sampling efficiency.

[0012] According to some embodiments of this application, the arc-shaped cutter includes a rotating rod and a plurality of cutting blades, the rotating rod being rotatably connected to the drill rod, and the plurality of cutting blades being spaced apart along the axial direction of the rotating rod.

[0013] According to some embodiments of this application, a rod sleeve is provided on the part of the rotating rod that protrudes from the drill rod near the driving member, and a first elastic member is provided between the rod sleeve and the rotating rod, with the two ends of the first elastic member abutting against the rod sleeve and the rotating rod respectively;

[0014] The sleeve is provided with a guide protrusion, and the rotating rod is provided with a spiral groove. The spiral groove is spirally arranged along the central axis of the rotating rod, and the guide protrusion can slide in the spiral groove to allow the rotating rod to rotate.

[0015] According to some embodiments of this application, an arc-shaped rod is provided at one end of the rod sleeve near the driving member, and the lifting assembly includes a stop bar. When the lifting assembly drives the sampling assembly to rise and the stop bar contacts the arc-shaped rod, the guide protrusion can slide within the spiral groove.

[0016] According to some embodiments of this application, the rotary cutting assembly further includes a connecting rod, one end of which is connected to the rod sleeve, and the other end of which is connected to the opening and closing assembly. When the guide protrusion slides to a second preset position in the spiral groove, the connecting rod drives the drill rod to unfold through the opening and closing assembly.

[0017] According to some embodiments of this application, the connecting rod includes a first rod portion and a second rod portion, the first rod portion and the second rod portion are arranged perpendicularly, one end of the first rod portion is connected to a rod sleeve, and the other end of the first rod portion can abut against the opening and closing assembly to drive the drill rod to unfold;

[0018] The drill rod is provided with a guide sleeve, and at least a portion of the second rod portion is slidably inserted into the guide sleeve.

[0019] According to some embodiments of this application, the drill rod is provided with a sliding groove, and the connecting rod further includes a third rod portion. One end of the third rod portion is provided with a slider, the slider being slidably connected to the sliding groove, and the other end of the third rod portion being rotatably connected to the first rod portion.

[0020] The slider is provided with a pushing part on the side near the opening and closing component. The pushing part can abut against the opening and closing component. When the guide protrusion slides to the second preset position in the spiral groove, the pushing part pushes the opening and closing component to move to the third preset position so that the drill rod unfolds.

[0021] According to some embodiments of this application, the drill rod comprises two symmetrically arranged semicircular rods, and one side of the two semicircular rods is hinged to each other along the axial direction of the drill rod, so that the two semicircular rods can be flipped open and closed;

[0022] Both of the semicircular rods are provided with slot blocks, and the opening and closing assembly includes a plug that is inserted into the slot block to lock the two semicircular rods.

[0023] According to some embodiments of this application, the opening and closing assembly further includes a housing, a push rod is provided on the top of the housing, the insert is provided on one side of the push rod, and a second elastic element is provided on the other side of the push rod. When the arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, the pushing part of the rotary cutting assembly pushes the push rod to move, so that the insert is separated from the slot block.

[0024] According to some embodiments of this application, a pressing plate is provided inside the housing, and a third elastic element is provided between the pressing plate and the inner wall of the housing. A rack is provided on the side of the pressing plate away from the third elastic element, and gears are meshed on both sides of the rack. The axle of each gear passes through the housing and is connected to the corresponding semi-circular rod. When the arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, the rack moves away from the third elastic element, and the two gears rotate, causing the two semi-circular rods to unfold.

[0025] According to some embodiments of this application, a drill bit is provided at the end of the drill rod away from the drive member.

[0026] The sampling method according to the second aspect embodiment of this application, using the sampling apparatus of the first aspect embodiment of this application, includes the following steps:

[0027] The starting device drives the drill rod to rotate, while the lifting assembly drives the drive and the drill rod to descend. The drill bit at the bottom of the drill rod rotates to drill out the hydrate, allowing the hydrate to enter the interior of the drill rod.

[0028] The lifting assembly drives the drive unit and the drill rod to rise, and the arc-shaped cutter rotates around the central axis of the drill rod, and the arc-shaped cutter cuts the hydrate drilled inside the drill rod into multiple transverse segments.

[0029] The arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, and the opening and closing component drives the drill rod to unfold, and samples of hydrates in different depth ranges are taken one by one for testing.

[0030] The sampling method according to the embodiments of this application has at least the following beneficial effects: The sampling method of this application pre-cuts the hydrate sample into segments, and the staff can sample and test the samples one by one according to different depth intervals. This method can more accurately explore the stratigraphic distribution data of hydrates, provide detailed and accurate data support for the research and development of hydrate resources, and help to understand the distribution pattern of hydrates in different strata.

[0031] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0032] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 This is one of the structural schematic diagrams of the sampling device according to the first aspect of this application;

[0034] Figure 2 This is a second schematic diagram of the sampling device according to the first aspect of this application;

[0035] Figure 3 for Figure 2 A schematic diagram of the sampling component of the sampling device shown.

[0036] Figure 4 for Figure 3 A schematic diagram of the sampling component when the two semicircular rods are closed;

[0037] Figure 5 for Figure 3 A schematic diagram of the sampling component when the two semicircular rods are unfolded;

[0038] Figure 6 for Figure 5 Enlarged view of section A;

[0039] Figure 7 for Figure 5 The diagram shows the structure of the drill rod of the rotary cutting assembly.

[0040] Figure 8 for Figure 5 The diagram shows the disassembled view of the rotary cutting assembly's sleeve and rotating rod.

[0041] Figure 9 for Figure 4 A partial structural diagram showing the two semicircular rods when closed;

[0042] Figure 10 for Figure 9 Enlarged view of section B;

[0043] Figure 11 for Figure 5 A partial structural diagram of the two semicircular rods shown when unfolded.

[0044] Figure 12 for Figure 5 The diagram shows the structure of the opening and closing component.

[0045] Figure 13 for Figure 12 The diagram shows the internal structure of the opening and closing component housing.

[0046] Figure 14 The second aspect of this application is a flowchart illustrating the sampling method.

[0047] Reference numerals: 100, lifting assembly; 110, platform; 120, lifting frame; 130, stop bar;

[0048] 200. Sampling assembly; 210. Drive unit; 220. Drill rod; 221. Semi-circular rod; 222. Slot block; 223. Slide groove; 224. Protrusion; 225. Guide sleeve; 230. Drill bit;

[0049] 300. Rotary cutting assembly; 310. Arc-shaped cutter; 311. Rotating rod; 3111. Spiral groove; 312. Cutting part; 320. Rod sleeve; 321. Guide protrusion; 330. First elastic element; 340. Arc-shaped rod; 350. Connecting rod; 351. First rod part; 352. Second rod part; 353. Third rod part; 360. Slider; 361. Pushing part;

[0050] 400, Opening / closing assembly; 410, Insert bar; 420, Housing; 430, Push rod; 431, First push rod; 432, Second push rod; 433, Center rod; 440, Second elastic element; 450, Extrusion plate; 460, Third elastic element; 470, Rack; 480, Gear. Detailed Implementation

[0051] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0052] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0053] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0054] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0055] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Reference Figure 1 , Figure 3 , Figure 5The first aspect of this application provides a sampling device, including a lifting assembly 100, a sampling assembly 200, a rotary cutting assembly 300, and an opening and closing assembly 400. The sampling assembly 200 is connected to the lifting end of the lifting assembly 100. The sampling assembly 200 includes a driving member 210 and a drill rod 220, and the drill rod 220 is connected to the driving end of the driving member 210. The rotary cutting assembly 300 includes an arc-shaped cutter 310, which is disposed inside the drill rod 220. The arc-shaped cutter 310 can rotate around the central axis of the drill rod 220 to perform multi-segment transverse cutting of the hydrate drilled inside the drill rod 220. The opening and closing assembly 400 is connected to the drill rod 220 and the rotary cutting assembly 300 respectively. When the arc-shaped cutter 310 rotates around the central axis of the drill rod 220 to a first preset position, the opening and closing assembly 400 drives the drill rod 220 to unfold to provide sampling.

[0057] Specifically, the arc-shaped cutter 310 is installed inside the drill rod 220. The arc-shaped cutter 310 can rotate around the central axis of the drill rod 220 to perform multi-segment transverse cutting of the hydrates drilled inside the drill rod 220, thereby distinguishing hydrates at different depths. Furthermore, when the arc-shaped cutter 310 rotates to the first preset position, the opening and closing component 400 causes the drill rod 220 to unfold, eliminating the need for personnel to use special tools to penetrate deep into the drill rod 220 or to rely on complex automated auxiliary tools for sample extraction, facilitating independent sampling of hydrates at different depths. Additionally, after cutting, the drill rod 220 unfolds in half, and the arc-shaped cutter 310 can also act as a bottom support to receive the cut hydrate samples, allowing personnel to quickly sample the segmented hydrates and improving sampling efficiency.

[0058] Reference Figure 1 , Figure 2 In some embodiments, the lifting assembly 100 includes a platform 110 and a lifting frame 120. The lifting frame 120 is disposed on one side of the platform 110, and the drive component 210 is disposed on the lifting frame 120. The lifting frame 120 drives the drive component 210 and the drill rod 220 to rise and fall via a hydraulic rod, facilitating the delivery of the drill rod 220 to different depths for sampling operations, thereby improving the flexibility and targeting of sampling. Simultaneously, the drill rod 220 is connected to the lower end of the drive component 210 via a Z-shaped coupling. The drive component 210 drives the drill rod 220 to rotate via the Z-shaped coupling, realizing the drilling operation of hydrates and allowing the hydrates to smoothly enter the interior of the drill rod 220.

[0059] It should be noted that the drive unit 210 is connected to the drill rod 220 via a Z-shaped coupling. The Z-shaped coupling is designed to facilitate the subsequent unfolding and sampling of the drill rod 220. The shape of the Z-shaped coupling ensures both the transmission of rotational power and the normal unfolding of the drill rod 220. Furthermore, the upper part of the Z-shaped coupling is connected to the power shaft of the drive unit 210, while the lower part is connected to the drill rod 220. After the drill rod 220 is unfolded, it remains connected to the Z-shaped coupling, and the Z-shaped coupling does not affect the unfolding of the drill rod 220.

[0060] In some embodiments, the drive unit 210 is configured as a drilling motor. Of course, in actual design, the structure of the drive unit 210 can be designed according to actual needs.

[0061] Reference Figure 5 , Figure 7 In some embodiments, the arc-shaped cutter 310 includes a rotating rod 311 and multiple cutting sections 312. The rotating rod 311 is rotatably connected to the drill rod 220, and the multiple cutting sections 312 are spaced apart along the axial direction of the rotating rod 311, so that the rotating rod 311 can synchronously drive the multiple cutting sections 312 to rotate around the central axis of the drill rod 220, performing multi-segment transverse cutting of the hydrate drilled inside the drill rod 220. Simultaneously, the spaced arrangement of the multiple cutting sections 312 allows for control of the length of each segment of hydrate after cutting according to actual sampling needs, achieving clear division of hydrate at different depths and ensuring the subsequent independent acquisition of samples at different depths. Furthermore, the combined action of the multiple cutting sections 312 improves the efficiency of hydrate cutting, reduces the time required for a single cutting operation, and ensures efficient completion of the cutting operation within the limited space inside the drill rod 220, further optimizing the continuity and efficiency of the overall sampling process.

[0062] Understandably, the curvature of the cutter part 312 is adapted to the curvature of the inner wall of the drill rod 220, so that the cutter part 312 can fit more closely into the inner groove of the drill rod 220, avoiding resistance when the cutter is drilling and sampling in the drill rod 220. In addition, there are two curved cutters 310, so that there are two sets of cutter parts 312 on the same horizontal line, which are centrally symmetrical with the center of the cross-section of the drill rod 220 as the base point. During the rotation, the two sets of cutter parts 312 will move towards the center of the cross-section of the drill rod 220 simultaneously, so as to cut the hydrate sample more efficiently.

[0063] Reference Figure 6 , Figure 8In some embodiments, a sleeve 320 is fitted onto the portion of the rotating rod 311 that protrudes from the drill rod 220 near the drive member 210. A first elastic member 330 is provided between the sleeve 320 and the rotating rod 311, with both ends of the first elastic member 330 abutting against the sleeve 320 and the rotating rod 311, respectively. The sleeve 320 is provided with a guide protrusion 321, and the rotating rod 311 is provided with a spiral groove 3111. The spiral groove 3111 is spirally arranged along the central axis of the rotating rod 311, and the guide protrusion 321 can slide within the spiral groove 3111 to allow the rotating rod 311 to rotate. Specifically, when the guide protrusion 321 slides along the spiral groove 3111, it generates a circumferential force on the rotating rod 311, causing the rotating rod 311 to rotate around its own central axis, thereby realizing the power transmission and rotation control of the rotating rod 311 and ensuring that the cutting part 312 of the arc-shaped cutter 310 can cut the hydrate. Furthermore, the two ends of the first elastic element 330 abut against the sleeve 320 and the rotating rod 311 respectively. After the sleeve 320 or the rotating rod 311 is displaced due to external force, it can use its own elastic restoring force to push them back to their initial relative positions, avoiding the need for additional manual operation or reliance on complex mechanisms during the reset process, thus simplifying the operation of the device. At the same time, the first elastic element 330 generates a continuous force on the rotating rod 311 through its own elastic deformation, which can fill any assembly gap that may exist between the rotating rod 311 and the sleeve 320, reducing the radial wobbling of the rotating rod 311 caused by the gap during rotation. This ensures that the rotating rod 311 always maintains a stable rotation trajectory, guaranteeing the accuracy of the cutting part 312 of the arc-shaped cutter 310 when cutting hydrates, and preventing the cutting position from shifting or the cutting from being incomplete due to wobbling, further improving the reliability of the hydrate cutting operation.

[0064] In some embodiments, the first elastic element 330 can be configured as a spring. Of course, in actual design, the structure of the first elastic element 330 can be designed according to actual needs.

[0065] Reference Figure 2 , Figure 4 In some embodiments, an arc-shaped rod 340 is provided at one end of the rod sleeve 320 near the drive member 210. The lifting assembly 100 includes a stop rod 130, which is disposed on the lifting frame 120. When the lifting assembly 100 drives the sampling assembly 200 to rise and the stop rod 130 contacts the arc-shaped rod 340, the arc-shaped rod 340 is blocked by the stop rod 130, generating a squeezing force on the rotating rod 311, causing the guide protrusion 321 to slide in the spiral groove 3111. When the guide protrusion 321 slides to the bottom of the spiral groove 3111, the arc-shaped cutter 310 completes the cutting of the hydrate drilled inside the drill rod 220.

[0066] Reference Figure 6 , Figure 9 , Figure 10In some embodiments, the rotary cutting assembly 300 further includes a connecting rod 350, one end of which is connected to the rod sleeve 320, and the other end of which is connected to the opening and closing assembly 400. When the guide protrusion 321 slides to the second preset position in the spiral groove 3111, the connecting rod 350 drives the drill rod 220 to unfold via the opening and closing assembly 400. Specifically, the connecting rod 350 includes a first rod portion 351 and a second rod portion 352, which are arranged perpendicularly. One end of the first rod portion 351 is connected to the rod sleeve 320, and the other end of the first rod portion 351 can abut against the opening and closing assembly 400 to drive the drill rod 220 to unfold. When the guide protrusion 321 slides to the bottom of the spiral groove 3111, the first rod 351 drives the drill rod 220 to unfold through the opening and closing component 400, which makes it easier for the staff to sample the segmented hydrate. The segmented hydrate samples can be obtained without going deep into the drill rod 220, simplifying the sampling operation process. Furthermore, the drill rod 220 is equipped with a guide sleeve 225, and at least a portion of the second rod portion 352 is slidably inserted into the guide sleeve 225. When the lifting frame 120 drives the drive component 210 and the drill rod 220 to rise, the arc-shaped rod 340 is pressed by the stop rod 130, and the guide protrusion 321 slides down along the spiral groove 3111, pushing the rotating rod 311 to rotate, thereby driving the arc-shaped cutter 310 to cut the hydrate. The sliding of the second rod portion 352 within the guide sleeve 225 stabilizes the movement of the rod sleeve 320, restricts the offset and sway of the rod sleeve 320, and ensures the smoothness of the movement of the rod sleeve 320 driving the rotating rod 311 and the connecting rod 350, thereby improving the overall stability of the device operation and the sampling efficiency. It should be noted that the second preset position is when the guide protrusion 321 slides to the bottom of the spiral groove 3111.

[0067] Reference Figure 6 , Figure 9 and Figure 10In some embodiments, the drill rod 220 is provided with a groove 223, and the connecting rod 350 also includes a third rod portion 353. One end of the third rod portion 353 is provided with a slider 360, which is slidably connected to the groove 223. The other end of the third rod portion 353 is rotatably connected to the first rod portion 351, so that the third rod portion 353 can adjust its angle with the movement of the first rod portion 351, ensuring the continuity of power transmission. In addition, a pushing part 361 is provided on the side of the slider 360 near the opening and closing assembly 400. The pushing part 361 can abut against the opening and closing assembly 400. When the guide protrusion 321 slides to the second preset position in the spiral groove 3111, the pushing part 361 pushes the opening and closing assembly 400 to move to the third preset position, so that the drill rod 220 unfolds. Through the coordinated action of slider 360, slide 223 and pusher 361, the rotation of rotating rod 311 and the unfolding action of drill rod 220 are linked, ensuring that drill rod 220 can be smoothly unfolded after hydrate is cut, making it convenient for staff to obtain segmented samples and improving the reliability of device operation and the convenience of sampling operation.

[0068] Reference Figure 6 , Figure 9 and Figure 10 In some embodiments, a slider 360 is provided at one end of the third rod 353 near the slide groove 223, and the slider 360 is slidably connected to the slide groove 223. Simultaneously, the cross-sectional shape of the slide groove 223 is T-shaped, and a T-shaped protrusion is provided at the bottom of the slider 360. The T-shaped protrusion slides along the interior of the slide groove 223, forming a concave-convex fitting connection structure. This structure restricts the relative position of the slider 360 and the slide groove 223, preventing the slider 360 from disengaging from the slide groove 223 during sliding, thus achieving a slidable connection between the slider 360 and the slide groove 223. The cooperation between the T-shaped protrusion and the T-shaped slide groove 223 limits the sliding trajectory of the slider 360, preventing the slider 360 from shifting left or right or wobbling up and down during movement. This ensures that the slider 360 always slides smoothly along the axis of the slide groove 223, thereby providing stable guidance for the movement of the third rod 353 and ensuring the positional accuracy and operational stability of the third rod 353 when it acts on the opening / closing assembly 400 through the pushing part 361.

[0069] Reference Figure 9 and Figure 10In some embodiments, the top of the drill rod 220 is provided with a protrusion 224, and a groove 223 is disposed within the protrusion 224, facilitating the third rod portion 353 to push the slider 360 to slide along the groove 223. The protrusion 224 provides an installation area for the groove 223, making the position of the groove 223 more defined and the structure more stable, avoiding the potential weakening of the main body strength that might result from the groove 223 being directly mounted on the drill rod 220 body, and ensuring the structural reliability of the drill rod 220 during drilling operations. In addition, the groove 223 being located within the protrusion 224 provides a regular and more enclosed path for the slider 360 to slide, reducing the interference of external factors on the sliding process, reducing the risk of the slider 360 getting stuck, and making it smoother and less strenuous for the third rod portion 353 to push the slider 360, ensuring efficient and stable power transmission.

[0070] Reference Figure 5 , Figure 6 and Figure 9 In some embodiments, the drill rod 220 comprises two symmetrically arranged semicircular rods 221. Along the axial direction of the drill rod 220, one side of the two semicircular rods 221 is hinged to each other, while the other end is in a freely unfolded state, allowing the two semicircular rods 221 to be flipped open and closed. When the drill rod 220 needs to be unfolded for sampling, the other end of the two semicircular rods 221 is opened freely around the hinged end, forming a split-open state. This facilitates the removal of the pre-cut hydrate sample without requiring personnel to use tools to penetrate deep into the drill rod 220, simplifying the material handling operation. In addition, each of the two semicircular rods 221 is provided with a slot block 222. The opening and closing assembly 400 includes an insert 410, which is inserted into the slot block 222 to lock the two semicircular rods 221, ensuring that the two semicircular rods 221 are combined to form a complete drill rod 220 structure. This prevents sample leakage or drilling failure due to loosening of the semicircular rods 221 during drilling, ensuring the stability of the drilling operation and the integrity of the sample. Furthermore, the insertion and engagement of the insert 410 and the slot block 222 allows for quick switching between locking and unlocking the drill rod 220. After the hydrate is cut, simply releasing the insertion of the insert 410 and the slot block 222 will drive the semicircular rods 221 to unfold, further improving sampling efficiency and ease of operation.

[0071] Reference Figure 10 and Figure 12In some embodiments, the opening and closing assembly 400 further includes a housing 420, with a push rod 430 on the top of the housing 420. An insert 410 is provided on one side of the push rod 430, and a second elastic element 440 is provided on the other side of the push rod 430. When the arc-shaped cutter 310 rotates around the central axis of the drill rod 220 to a first preset position, the push part 361 of the rotary cutting assembly 300 pushes the push rod 430 to move, causing the insert 410 to separate from the slot block 222. Specifically, when the guide protrusion 321 of the sleeve 320 slides within the spiral groove 3111 of the rotating rod 311 to a second preset position, the push part 361 applies a force to the push rod 430, causing the push rod 430 to move away from the slot block 222, driving the insert 410 to move synchronously, thus separating the insert 410 from the slot block 222, releasing the lock on the two semi-circular rods 221, and facilitating the unfolding of the drill rod 220 for sampling. In addition, the second elastic element 440 deforms when the push rod 430 moves. After the force of the push part 361 disappears, it can drive the push rod 430 to reset, which makes it easy for the insert 410 to be re-inserted into the slot block 222. The two semi-circular rods 221 are in a closed state, completing the locking of the drill rod 220, preparing for the next sampling and simplifying the operation process.

[0072] Reference Figure 12 In some embodiments, two push rods 430 are provided, namely a first push rod 431 and a second push rod 432. The first push rod 431 and the second push rod 432 are parallel and spaced apart. The second push rod 432 is connected to the housing 420. The first push rod 431 can slide against the upper surface of the housing 420. The second push rod 432 and the first push rod 431 are connected by a second elastic member 440. The insert 410 is connected to the first push rod 431 and is located on the side of the first push rod 431 away from the second push rod 432. In addition, the second push rod 432 is provided with a clearance hole, and the first push rod 431 is provided with a center rod 433. The center rod 433 passes through the clearance hole. The clearance hole can guide the sliding of the center rod 433, limit the movement trajectory of the first push rod 431, and prevent the first push rod 431 from deviating or shaking during the sliding process, thus ensuring the linearity and stability of the movement of the insert 410 driven by the first push rod 431.

[0073] In some embodiments, the second elastic element 440 can be set as a spring. Of course, in actual design, the structure of the second elastic element 440 can be designed according to actual needs.

[0074] Reference Figure 11 , Figure 13In some embodiments, a pressing plate 450 is provided inside the housing 420, and a third elastic element 460 is provided between the pressing plate 450 and the inner wall of the housing 420. A rack 470 is provided on the side of the pressing plate 450 away from the third elastic element 460. Gears 480 are meshed on both sides of the rack 470. The axle of each gear 480 passes through the housing 420 and is connected to the corresponding semi-circular rod 221. When the arc-shaped cutter 310 rotates around the central axis of the drill rod 220 to the first preset position, the insert 410 separates from the slot block 222, the rack 470 moves away from the third elastic element 460, and the two gears 480 rotate, causing the two semi-circular rods 221 to unfold. The pressing plate 450 and the third elastic element 460 inside the housing 420 cooperate to provide a power basis for the movement of the rack 470. The elastic potential energy of the third elastic element 460 can be converted into the kinetic energy of the rack 470, propelling the rack 470 to move stably.

[0075] Specifically, when the lifting assembly 100 drives the sampling assembly 200 to rise, and the stop bar 130 contacts and presses the arc-shaped bar 340, the guide protrusion 321 of the bar sleeve 320 slides in the spiral groove 3111 of the rotating bar 311, the first rod part 351 presses down, causing the second rod part 352 to slide in the guide sleeve 225. At the same time, the first rod part 351 pushes the slider 360 to move along the slide groove 223 through the third rod part 353. When the guide protrusion 321 slides to the bottom of the spiral groove 3111 (i.e., the second preset position), the arc-shaped cutter 310 rotates around the central axis of the drill rod 220 to the first preset position. The third rod part 353 drives the slider 360 to move along the slide groove 223 on the drill rod 220. At the same time, the pushing part 361 drives the second push rod 432 to move to the third preset position, thereby separating the insert 410 from the slot block 222 and releasing the lock on the semi-circular rod 221. At this time, since the first push rod 431 is connected to the housing 420, the housing 420 moves synchronously with the second push rod 432, thereby compressing the third elastic member 460. Under the action of the third elastic member 460, the rack 470 moves away from the third elastic member 460 and drives the two gears 480 to rotate. Since the axles of the two gears 480 are respectively connected to the corresponding semi-circular rods 221, the two semi-circular rods 221 unfold in half when the axles of the two gears 480 rotate.

[0076] In some embodiments, the third elastic element 460 can be set as a spring. Of course, in actual design, the structure of the third elastic element 460 can be designed according to actual needs.

[0077] It should be noted that the axle of gear 480 is connected to the upper rear part of drill rod 220. When gear 480 rotates, the position of the axle on gear 480 does not change. Since the axle of gear 480 is connected to the rotating end of the top of drill rod 220, and the axles of the two gears 480 are positioned close to the hinge ends of the two semi-circular rods 221, when gear 480 rotates, it drives the semi-circular rods 221 to rotate around the hinge ends via the axles. Therefore, when the axles of the two gears 480 rotate, drill rod 220 unfolds normally (refer to...). Figure 11 This allows staff to quickly sample the hydrates that have already been segmented and cut. Because the hydrate samples are pre-segmented, relevant personnel can sample and test each sample from different depth ranges, making it easier to explore the stratigraphic distribution data of the hydrates.

[0078] Reference Figure 3 In some embodiments, a drill bit 230 is provided at the end of the drill rod 220 away from the drive member 210. Specifically, an external threaded ring is rotatably installed at the bottom of the drill rod 220 close to the hinged end of the two semi-circular rods 221. The drill bit 230 is screwed onto the outer thread of the external threaded ring. The screwing connection between the external threaded ring and the drill bit 230 facilitates the installation and replacement of the drill bit 230. When the drive member 210 drives the drill rod 220 to rotate, the drill bit 230 rotates to achieve drilling into the hydrate formation.

[0079] Reference Figure 14 A second aspect of this application provides a sampling method using the sampling apparatus of the first aspect of this application, comprising the following steps:

[0080] S100: The starting device, the drive component 210 drives the drill rod 220 to rotate, and at the same time the lifting component 100 drives the drive component 210 and the drill rod 220 to descend. The drill bit 230 at the bottom of the drill rod 220 rotates to drill out the hydrate, so that the hydrate enters the interior of the drill rod 220.

[0081] In step S100, the drill rod 220 is connected to the lower end of the drive unit 210 via a Z-shaped coupling for power transmission. An external threaded ring is installed on the bottom of the drill rod 220 close to the hinge end of the two semi-circular rods 221. The drill bit 230 is screwed onto the outer thread of the external threaded ring. The rotary cutting assembly 300 is connected to the drill rod 220. The third rod part 353, the opening and closing assembly 400 and other components are in their initial positions. The insert 410 is inserted into the slot block 222 at the top of the drill rod 220. At this time, the drill rod 220 is in a closed state.

[0082] In step S100, the drive unit 210 drives the drill rod 220 to rotate via the Z-shaped coupling. At the same time, the hydraulic rod on the lifting frame 120 pushes the drive unit 210 and the drill rod 220 to descend. The drill bit 230 at the bottom of the drill rod 220 rotates to drill out the hydrate, and the hydrate enters the interior of the drill rod 220.

[0083] S200: The lifting assembly 100 drives the drive component 210 and the drill rod 220 to rise, and the arc-shaped cutter 310 rotates around the central axis of the drill rod 220. The arc-shaped cutter 310 cuts the hydrate drilled inside the drill rod 220 into multiple horizontal segments.

[0084] In step S200, when the hydraulic rod on the lifting frame 120 pushes the drive component 210 and the drill rod 220 to rise, the stop bar 130 set on the upper part of the lifting frame 120 squeezes the arc-shaped rod 340 in the rotary cutting assembly 300. The guide protrusion 321 on the inner wall of the rod sleeve 320 slides down along the spiral groove 3111 of the rotating rod 311, pushing the rotating rod 311 to rotate. The arc-shaped cutter 310 rotates accordingly to cut the hydrate into multiple transverse segments.

[0085] S300: The arc-shaped cutter 310 rotates around the central axis of the drill rod 220 to the first preset position, and the opening and closing component 400 drives the drill rod 220 to unfold, and samples of hydrates in different depth ranges are taken one by one for testing.

[0086] In step S300, when the rotary cutting assembly 300 is in position, that is, when the guide protrusion 321 of the sleeve 320 slides down to the bottom of the spiral groove 3111 of the rotating rod 311, the first rod portion 351 and the second rod portion 352 on one side of the sleeve 320 are pressed down, and the third rod portion 353 drives the slider 360 to slide along the groove 223 on the drill rod 220. The push portion 361 of the slider 360 pushes the push rod 430 to move, so as to squeeze the second elastic member 440, so that the insert 410 of the opening and closing assembly 400 is pulled out from the slot block 222 at the top of the drill rod 220.

[0087] In step S300, after the insert 410 separates from the slot block 222, the rack 470 of the opening and closing assembly 400 slides under the action of the third elastic element 460, and drives the gears 480 meshing with both sides of the rack 470 to rotate, thereby driving the two semi-circular rods 221 of the drill rod 220 to rotate. The drill rod 220 unfolds in half, and the staff takes samples of the segmented hydrates according to different depth intervals for testing.

[0088] The sampling method of this application involves pre-segmenting hydrate samples, allowing personnel to sample and test each sample individually according to different depth ranges. This method enables more precise exploration of the stratigraphic distribution of hydrates, providing detailed and accurate data support for hydrate resource research and development, and contributing to a deeper understanding of the distribution patterns of hydrates in different strata. The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

Claims

1. A sampling device, characterized in that, include: Lifting assembly; A sampling component is provided, which is connected to the lifting end of the lifting component. The sampling component includes a driving component and a drill rod, and the drill rod is connected to the driving end of the driving component. A rotary cutting assembly includes an arc-shaped cutter disposed inside the drill rod. The arc-shaped cutter rotates around the central axis of the drill rod to perform multi-segment transverse cutting of the hydrate drilled inside the drill rod. The arc-shaped cutter includes a rotating rod and multiple cutting sections. The rotating rod is rotatably connected to the drill rod, and the multiple cutting sections are spaced apart along the axial direction of the rotating rod. A rod sleeve is fitted onto the portion of the rotating rod protruding from the drill rod near the drive member. A first elastic element is disposed between the rod sleeve and the rotating rod, and both ends of the first elastic element abut against the rod sleeve and the rotating rod, respectively. The rod sleeve is provided with a guide protrusion, and the rotating rod is provided with a helical groove. The helical groove is helically arranged along the central axis of the rotating rod, and the guide protrusion slides within the helical groove to allow the rotating rod to rotate. An opening and closing assembly is connected to both the drill rod and the rotary cutting assembly. When the arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, the opening and closing assembly causes the drill rod to unfold for sampling. The rotary cutting assembly also includes a connecting rod, one end of which is connected to the rod sleeve, and the other end of which is connected to the opening and closing assembly. When the guide protrusion slides within the spiral groove to a second preset position, the connecting rod, through the opening and closing assembly, causes the drill rod to unfold. The connecting rod includes a first rod portion and a second rod portion, which are perpendicularly arranged. One end of the first rod portion is connected to the rod sleeve, and the other end of the first rod portion abuts against the opening and closing assembly to unfold the drill rod. The drill rod is provided with a guide sleeve, and at least a portion of the second rod portion is slidably inserted into the guide sleeve. The drill rod is provided with a sliding groove. The connecting rod also includes a third rod portion, one end of which is provided with a slider that is slidably connected to the sliding groove, and the other end of the third rod portion is connected to... The first rod is rotatably connected; a pushing part is provided on the side of the slider near the opening and closing assembly, and the pushing part abuts against the opening and closing assembly. When the guide protrusion slides to the second preset position in the spiral groove, the pushing part pushes the opening and closing assembly to move to the third preset position, so that the drill rod unfolds; the drill rod consists of two symmetrically arranged semi-circular rods, and one side of the two semi-circular rods is hinged to each other along the axial direction of the drill rod, so that the two semi-circular rods can flip open and close; both semi-circular rods are provided with slot blocks, and the opening and closing assembly includes a strip, which is inserted into the slot block to lock the two semi-circular rods; the opening and closing assembly also includes a housing, and a pushing rod is provided on the top of the housing. The strip is provided on one side of the pushing rod, and a second elastic element is provided on the other side of the pushing rod. When the arc-shaped cutter rotates around the central axis of the drill rod to the first preset position, the pushing part of the rotary cutting assembly pushes the pushing rod to move, so that the strip separates from the slot block.

2. The sampling device of claim 1, wherein, An extrusion plate is provided inside the housing, and a third elastic element is provided between the extrusion plate and the inner wall of the housing. A rack is provided on the side of the extrusion plate away from the third elastic element. Gears are meshed on both sides of the rack. The axle of each gear passes through the housing and is connected to the corresponding semi-circular rod. When the arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, the rack moves away from the third elastic element, and the two gears rotate, causing the two semi-circular rods to unfold.

3. A sampling method, characterized by, Using the sampling device according to any one of claims 1 to 2, the steps include: The starting device drives the drill rod to rotate, while the lifting assembly drives the drive and the drill rod to descend. The drill bit at the bottom of the drill rod rotates to drill out the hydrate, allowing the hydrate to enter the interior of the drill rod. The lifting assembly drives the drive unit and the drill rod to rise, and the arc-shaped cutter rotates around the central axis of the drill rod, and the arc-shaped cutter cuts the hydrate drilled inside the drill rod into multiple transverse segments. The arc-shaped cutter rotates around the central axis of the drill rod to a first preset position, and the opening and closing component drives the drill rod to unfold, and samples of hydrates in different depth ranges are taken one by one for testing.

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