Drilling tool and drilling equipment for cobblestone stratum
By incorporating a detachable outer cylinder and anti-fall-off limiting component into the drilling tool for cobblestone formations, the problem of low core recovery rate in cobblestone formations was solved, enabling the complete extraction of core samples and adapting to the characteristics of loose cobblestone layers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-03-10
AI Technical Summary
In cobblestone formations, conventional single-tube coring tools are difficult to use effectively, resulting in a very low core sampling rate and the inability to obtain complete core samples. This is mainly because the lack of cementation and looseness of cobblestones makes it impossible for the retaining spring to hold the irregular cobblestones, causing the core to easily slip off.
Design a drilling tool including a detachable outer cylinder and a core drill bit, with an internal anti-drop component. An elastic limiting element forms a one-way channel. When the core sample is taken, the limiting element is squeezed open, and when the drill is pulled up, the limiting element is closed to prevent the core sample from falling out. The outer cylinder is detachably connected to the drill rod to facilitate the removal of the core sample.
It enables the complete extraction of core samples from pebble formations, adapts to the characteristics of loose pebble layers, improves the core recovery rate, and solves the problem that conventional drilling tools cannot effectively extract samples.
Smart Images
Figure CN121630255A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of drilling equipment technology, and in particular to a drilling tool and drilling equipment for cobblestone formations. Background Technology
[0002] Drilling in strata containing pebbles presents a significant challenge in sampling. This is because the core of such strata is characterized by its lack of cementation, consisting mainly of pebbles and gravel of varying sizes. The core itself is loose and fragmented, making it difficult to form a stable overall structure. This presents numerous insurmountable obstacles to the application of conventional coring tools.
[0003] The single-tube coring drill, widely used in the industry, performs poorly, or even fails to collect effective samples, when sampling in loose strata containing pebbles. This is due to the shared sampling and flushing fluid channels of the single-tube coring drill. The single-tube drill is only suitable for cemented, dense, intact bedrock strata: the drilled columnar core has a stable structure, can resist flushing fluid erosion, and can be held by spring clips, so it can be retrieved intact after drilling. However, when sampling in pebbly strata, the pebbles have no binding force, the spring clips cannot hold irregular pebbles, and there is no independent support structure, so the pebbles easily slip when drilling, resulting in a very low coring rate and difficulty in obtaining effective samples. Summary of the Invention
[0004] To address the aforementioned technical problems, this invention provides a drilling tool and drilling equipment for pebble formations.
[0005] In a first aspect, the present invention provides a drilling tool for cobblestone formations. The drilling tool includes a drill rod connected to a drilling rig, an outer cylinder detachably connected to the bottom end of the drill rod, a core drill bit having a core channel and being annular in shape, and an anti-detachment component disposed within the core channel. The outer cylinder and the core drill bit are detachably connected. The outer cylinder has a cavity capable of accommodating core samples from the cobblestone layer, and the cavity is connected to the core channel. The anti-detachment component includes an mounting ring disposed within the core channel and coaxially arranged with the core drill bit, and multiple elongated limiting members made of elastic material. All are located within the core channel. The first ends of multiple limiting components are evenly arranged along the circumference of the mounting ring and connected to the mounting ring. The second ends of multiple limiting components are located on the side of the mounting ring closer to the outer cylinder. The second ends of multiple limiting components approach each other to form a one-way channel. When sampling, the pebble core sample squeezes the second ends of multiple limiting components to make the second ends of multiple limiting components move away from each other, opening the one-way channel. When the drill bit is moved upward, the pebble core sample in the outer cylinder squeezes the second ends of multiple limiting components to make the second ends of multiple limiting components move closer to each other, closing the one-way channel.
[0006] Optionally, there are no fewer than two anti-detachment components, and all anti-detachment components are spaced apart in the core channel.
[0007] Optionally, the center lines of the limiting component and the core drill bit are arranged at an angle, and the angle is an acute angle.
[0008] Optional, the included angle is 45°.
[0009] Optionally, the bottom end of the drill pipe and the outer cylinder, as well as the outer cylinder and the core drill bit, are threaded together.
[0010] Optionally, multiple guide grooves are opened on the inner wall of the core channel of the coring drill bit.
[0011] Optionally, the core drill bit has cutting teeth at the bottom.
[0012] In a second aspect, the present invention provides a drilling device, including the drilling tool for cobblestone formations provided in the first aspect; the drilling device also includes a vehicle body assembly, on which a drill frame is mounted, and a vertically arranged guide hole is formed in the drill frame; a drill rig is mounted on the drill frame, the output end of the drill rig is connected to the top end of the drill rod, and the drill rod is slidably disposed in the guide hole.
[0013] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art: 1. By setting up limiting components made of elastic material, the second ends of multiple limiting components are enclosed to form a one-way channel. When sampling, the core sample can be squeezed to open the one-way channel. When the drill is pulled out, the core is squeezed in the opposite direction to close the one-way channel, thus achieving the purpose of preventing the core from falling out and ensuring that the core sample can be completely taken out after the drill is pulled out. This is adapted to the formation characteristics of uncemented, loose and broken pebble core samples, and solves the problem of extremely low coring rate and ineffective sampling of conventional single-tube drill tools.
[0014] 2. By making the outer cylinder detachably connected to the core drill bit and drill rod, the core sample of the pebble layer in the outer cylinder can be easily removed. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a drilling tool for pebble formations provided in Embodiment 1 of the present invention.
[0016] Figure 2 This is a cross-sectional view of the drilling tool provided in Embodiment 1 of the present invention during sampling.
[0017] Figure 3 This is a top view of the anti-fall-off component provided in Embodiment 1 of the present invention.
[0018] Figure 4 This is a schematic diagram of a drilling device provided in Embodiment 2 of the present invention.
[0019] Explanation of reference numerals in the attached drawings: 1. Outer cylinder; 2. Core drill bit; 21. Core channel; 3. Anti-fall-off component; 31. Mounting ring; 32. Limiting component; 4. Car body assembly; 5. Drill frame. Detailed Implementation
[0020] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.
[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 the technical solution of this invention 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 invention.
[0022] Example 1: like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a drilling tool for cobblestone formations. The drilling tool includes a drill rod connected to a drilling rig, an outer cylinder 1 detachably connected to the bottom end of the drill rod, a core drill bit 2 with a core channel 21 inside and in an annular shape, and an anti-detachment component 3 disposed within the core channel 21. The outer cylinder 1 and the core drill bit 2 are detachably connected. The outer cylinder 1 has a cavity capable of accommodating core samples from the cobblestone layer, and the cavity is connected to the core channel 21. The anti-detachment component 3 includes an mounting ring 31 disposed within the core channel 21 and coaxially arranged with the core drill bit 2, and multiple elongated limiting members 32 made of elastic material. The multiple limiting members 32 are all... Within the core channel 21, the first ends of multiple limiting members 32 are evenly arranged along the circumference of the mounting ring 31 and connected to the mounting ring 31. The second ends of the multiple limiting members 32 are all located on the side of the mounting ring 31 closer to the outer cylinder 1. The second ends of the multiple limiting members 32 are close to each other and enclose each other to form a one-way channel. When sampling, the pebble core sample squeezes the second ends of the multiple limiting members 32 to make the second ends of the multiple limiting members 32 move away from each other and open the one-way channel. When the drill bit is moved upward, the pebble core sample in the outer cylinder 1 squeezes the second ends of the multiple limiting members 32 to make the second ends of the multiple limiting members 32 move closer to each other and close the one-way channel.
[0023] There are no fewer than two anti-detachment components 3, and all anti-detachment components 3 are spaced apart in the core channel 21.
[0024] The center lines of the limiting component 32 and the core drill bit 2 are arranged at an angle, and the angle is an acute angle of 45°.
[0025] The bottom end of the drill rod and the outer cylinder 1, as well as the outer cylinder 1 and the core drill bit 2, are all threadedly connected.
[0026] Multiple guide grooves are opened on the inner wall of the core channel 21 of the core drill bit 2.
[0027] The bottom end of the core drill bit 2 has cutting teeth.
[0028] Example 2: like Figure 4 As shown, this embodiment provides a drilling equipment, including the drilling tool for cobblestone formations provided in Embodiment 1; the drilling equipment also includes a vehicle body assembly 4, on which a drill frame 5 is mounted, and a vertically arranged guide hole is formed in the drill frame 5; a drill is mounted on the drill frame 5, and the output end of the drill is connected to the top end of the drill rod, and the drill rod is slidably arranged in the guide hole.
[0029] Example 3: This embodiment provides a coring method. The coring method uses the drilling tool for cobblestone formations provided in Embodiment 1. The coring method includes: Step 1: Install the drill rod onto the drilling rig; Step 2: Install the outer cylinder onto the bottom end of the drill pipe; Step 3: Install the core drill bit 2 at the bottom of the outer cylinder; Step 4: Start the drilling rig to perform core drilling operations; Step 5: When the drill rod and core drill bit 2 are drilled to the preset depth, the core drill tool is driven to be raised at a constant speed by the feed mechanism of the drilling machine. After the core drill tool leaves the borehole, the core drill bit 2 connected to the outer cylinder is removed and the pebble core sample in the outer cylinder is poured out.
[0030] The above embodiments are merely a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. A drill tool for use in a cobble formation, the drill tool comprising a drill string connected to a drill rig, characterised in that, The device comprises an outer cylinder detachably connected with the bottom end of a drill rod, a coring drill bit with a core channel in the interior and in a ring shape, and an anti-falling assembly arranged in the core channel; the outer cylinder and the coring drill bit are detachably connected, the outer cylinder has a cavity capable of accommodating a cobblestone layer core sample, and the cavity and the core channel are in communication; The anti-falling assembly comprises a mounting ring arranged coaxially with the coring drill bit in the core channel, and a plurality of limiting members each in a strip shape and each made of an elastic material; the plurality of limiting members are each arranged in the core channel, the first ends of the plurality of limiting members are uniformly arranged along the circumference of the mounting ring and connected with the mounting ring, the second ends of the plurality of limiting members are each located on the side of the mounting ring close to the outer cylinder, and the second ends of the plurality of limiting members are close to each other to form a one-way channel; during sampling, the cobblestone layer core sample extrudes the second ends of the plurality of limiting members to make the second ends of the plurality of limiting members move away from each other and open the one-way channel; when the drill tool is moved upward, the cobblestone layer core sample in the outer cylinder extrudes the second ends of the plurality of limiting members to make the second ends of the plurality of limiting members move close to each other and close the one-way channel.
2. The drill tool for a cobblestone formation according to claim 1, wherein, The anti-falling assembly is not less than two, and all the anti-falling assemblies are arranged at intervals in the core channel.
3. The drill tool for a cobblestone formation of claim 1, wherein, The limiting member and the center line of the coring drill bit are arranged at an included angle, and the included angle is an acute angle.
4. The drill tool for a cobblestone formation according to claim 3, wherein, The included angle is 45°.
5. The drill tool for a cobblestone formation of claim 1, wherein, The bottom end of the drill rod and the outer cylinder, and the outer cylinder and the coring drill bit are threadedly connected.
6. The drill tool for a cobblestone formation of claim 1, wherein, A plurality of flow guide grooves are formed on the inner wall of the core channel of the coring drill bit.
7. The drill tool for a cobblestone formation of claim 1, wherein, The bottom end of the coring drill bit has a cutting tooth.
8. A drilling apparatus, characterized by The device comprises the drill tool for cobblestone stratum as claimed in any one of claims 1-7; the drilling device further comprises a vehicle body assembly, the vehicle body assembly is provided with a drill stand, a vertical guide hole is formed in the drill stand, a drilling machine is mounted on the drill stand, the output end of the drilling machine is in transmission connection with the top end of the drill rod, and the drill rod is slidably arranged in the guide hole.