A core drilling in-hole accident handling tool and method of use thereof

Abstract

This invention relates to the field of core drilling technology, specifically disclosing a tool for handling accidents inside core drilling holes and its method of use. The tool comprises an upper connecting part, the upper portion of which is connected to a power head; a lower connecting part, the lower portion of which is connected to the drill pipe; and a connecting assembly for detachable connection between the upper and lower connecting parts. The connecting assembly includes an adjustment assembly, a radial contraction assembly, and clamping plates. The radial contraction assembly includes at least two arc-shaped plates, multiple arc-shaped plates coaxially arranged within the upper connecting part, with fixing posts on the inner sides of the arc-shaped plates. The fixing posts are fixedly connected to the upper connecting part, and the arc-shaped plates are connected to the fixing posts by springs. Clamping plates are correspondingly arranged on the outer walls of the arc-shaped plates. The adjustment assembly drives the radial contraction assembly to perform radial contraction. This tool, composed of a detachably connected upper and lower connecting part, allows for the stretching and release of the drill pipe, utilizing the principle of "spring" to unblock a stuck drill pipe.

Description

Technical Field

[0001] This invention relates to the field of core drilling technology, specifically to a tool for handling accidents inside core drilling holes and its usage method. Background Technology

[0002] Core drilling technology obtains geological information by drilling underground rock cores. Wireline coring is a widely used core drilling technique. This technique uses a special rope to lift the inner tube assembly directly from the drill pipe to the surface to obtain the core. During drilling, once the inner tube is filled with core material, there is no need to lift the drill string; instead, a winch is used to lower the retrieval device to lift the inner tube, leaving the outer tube and drill pipe inside the borehole for continued drilling. This significantly reduces the number of times the drill string needs to be lifted, improving efficiency. Because the drill string remains inside the borehole during drilling or retrieving the inner tube, and the gap between the drill string's outer wall and the borehole wall is relatively small, encountering fractured strata can lead to the drill string becoming stuck due to falling rocks or sinking rock cuttings. According to geological core drilling regulations, the handling of such accidents includes the following steps and methods:

[0003] Step 1: Simple methods such as lifting, striking, shaking, scooping, rushing, grabbing, sucking, sticking, darting, and pushing.

[0004] Step 2: Methods such as reverse, loop, cut, and hook.

[0005] Step 3: Peeling, threading, sweeping, soaking, and other methods.

[0006] Step 4: Using methods such as wrapping or blasting.

[0007] In the above steps, if the method in the first step successfully releases the drill string, it means that the entire drill string will be pulled out of the borehole, leaving no residue, which is the ideal state. The method in the second step may result in drill string residue remaining in the borehole, so it is necessary to continue with the methods in the subsequent steps. The method in the third step is mainly to deal with the residue in the borehole. The "bypass" method in the fourth step is usually used when the first three steps are ineffective, that is, bypassing the stuck part of the drill string before resuming drilling and coring. The "explosion" method requires explosives and is generally not used.

[0008] It is evident that the ideal scenario is to completely remove the drill string from the borehole using the method described in the first step. The subsequent three steps increase the likelihood of complications arising from borehole accidents.

[0009] Therefore, the industry has summarized conventional handling methods for such borehole accidents, such as "lifting", "hitting", "vibrating", "retrieving", and "reversing". However, in some more serious cases, the above methods cannot free the stuck drill string. Summary of the Invention

[0010] The purpose of this invention is to provide a tool for handling accidents inside core drilling holes and a method for using the tool. The tool consists of a detachable upper connecting part and a lower connecting part. Since the upper connecting part and the lower connecting part can be separated, the drill string can be stretched and then released, and the stuck drill string can be unstuck by using the principle of "spring".

[0011] This invention is achieved through the following technical solution:

[0012] A tool for handling accidents inside a core drilling hole, comprising:

[0013] The upper connecting part is connected to the power head at its upper part;

[0014] The lower connecting part is connected to the drill pipe at its lower part;

[0015] A connecting assembly for enabling a detachable connection between the upper and lower connecting parts, the connecting assembly including an adjusting assembly, a radial shrinking assembly, and a retaining plate;

[0016] The radial shrinkage assembly includes at least two arc-shaped plates, multiple arc-shaped plates are coaxially arranged in the upper connecting part, and fixing columns are provided on the inner side of the multiple arc-shaped plates. The fixing columns are fixedly connected to the upper connecting part, and the arc-shaped plates and the fixing columns are connected by springs.

[0017] The card plates are arranged one-to-one on the outer wall of the arc-shaped plate; the side walls of the upper and lower connecting parts are respectively provided with a first through groove and a second through groove for the card plates to pass through.

[0018] The adjusting assembly includes a ring, a first sliding sleeve, and a clamping element;

[0019] The ring is rotatably disposed inside the upper connecting part and coaxially disposed outside the arc plate. The first sliding sleeve is hinged to the ring and corresponds one-to-one with the arc plate. The clamping member is slidably disposed inside the first sliding sleeve. One end of the clamping member is rotatably connected to the inside of the upper connecting part, and the other end is in contact with the arc plate. When the ring rotates, the clamping member rotates around its rotation connection point, thereby pushing the arc plate to move radially inward. The restoring force of the spring is used to realize the radial outward movement of the arc plate.

[0020] The original intention of this invention is:

[0021] Design an automatically disassembly and detachable tool for handling accidents inside core drilling holes. When the drill string gets stuck, the tool is installed between the drill string and the power head. Then, the power head is lifted using its own hydraulic cylinder. When the power head reaches a set height, the tool separates, thus separating the power head from the drill string. The drill string's elasticity is then used to release the stuck drill string. Drill strings used in core drilling are steel pipes with threads at both ends. During drilling, the upper end of the drill string, formed by connecting the drill pipes sequentially, connects to the surface drilling rig's drive unit (power head), and the lower end connects to the drill bit. Individual drill pipes are relatively short; if several drill pipes are simply connected together to form a short drill string, it is not easily stretched, resulting in minimal elongation and failing to demonstrate elasticity. The invention is "elastic" because the drilling depth is large and the length of the drill string formed by connecting drill rods is hundreds of meters. When the drill string is stretched, it will rebound and bounce when suddenly released.

[0022] The core of this invention for unblocking drill pipe lies in how the drill pipe string "springs" back. The key to the "springing" of the drill pipe string is its up-and-down movement. The core drilling hole accident handling tool of this invention consists of a detachable upper connecting part and a lower connecting part. That is, the basis for the "springing" of the drill pipe string is that the upper connecting part and the lower connecting part can be separated. The key is how to make the upper connecting part and the lower connecting part separate.

[0023] This invention utilizes the radial shrinkage of the radial shrinkage component to insert or remove the card plate from the lower connecting part. By inserting or removing the card plate from the lower connecting part, the upper connecting part and the lower connecting part can be connected as one unit or separated into two independent parts.

[0024] Radial shrinkage assemblies are relatively common components; however, for the specific structure and function of this application, the radial shrinkage assemblies used must have good structural stability. Specifically, since the core drilling borehole accident handling tool of this invention needs to be used to lift heavy drill rods, the core drilling borehole accident handling tool, which is composed of an upper connecting part and a lower connecting part, needs sufficient stability. That is, the shrinkage stability of the radial shrinkage assembly is required. After the upper connecting part and the lower connecting part are connected, the radial shrinkage assembly needs to remain stable and not cause the lower connecting part to be pulled out of the clamp.

[0025] In this invention, the function of the adjusting component is to enable the radial shrinkage component to shrink radially. The invention achieves this by rationally designing the structure of the adjusting component, which specifically includes a ring, a first sliding sleeve, and a clamping member. This invention utilizes the rotation of the ring to control the radial shrinkage component to shrink radially. The rotation of the ring requires an external driving force. When there is no external driving force, the ring is fixed, thus making the radial shrinkage of the radial shrinkage component controllable. This control can be achieved by whether or not an external driving force is provided.

[0026] In other words, the adjustment component of the present invention can both enable the radial shrinkage component to shrink radially and ensure the shrinkage stability of the radial shrinkage component, thus avoiding the problem that the upper and lower connecting parts separate before the set displacement is reached during the drill string lifting process.

[0027] In summary, the processing tool of the present invention consists of a detachable upper connecting part and a lower connecting part. Since the upper connecting part and the lower connecting part can be separated, the drill string can be stretched and then released, and the stuck drill string can be unstuck by using the principle of "spring".

[0028] Specifically, the upper connecting part includes an upper housing, the upper part of which is provided with an internal thread, which is connected to the power head. The lower part of the upper housing is located inside the lower connecting part, which can be used to connect or disconnect the upper connecting part and the lower connecting part by radial movement of the clamping plate.

[0029] In a preferred embodiment, the middle part of the upper housing protrudes radially outward to form an annular cavity, the annular cavity having an upper annular surface, a lower annular surface and a side annular surface, and the ring is slidably disposed on the lower annular surface or the side annular surface.

[0030] The annular cavity of this invention provides installation space for the adjustment component. Since the adjustment component is located outside the radial contraction component, to improve the stability of the radial contraction component installation, it is preferable that when the upper and lower connecting parts are connected, the outer wall of the arc-shaped plate is in close contact with the inner wall of the upper shell, and the outer wall of the upper shell is in close contact with the interior of the lower connecting part. If the upper shell is set as a constant diameter structure, it is impossible to achieve the same tight contact between the outer wall of the arc-shaped plate and the inner wall of the upper shell after the upper and lower connecting parts are connected. On the other hand, the annular cavity of this invention provides conditions for the rotation of the ring. When the ring slides on the lower annular surface, it is a more preferred technical solution, which is beneficial to improving structural stability.

[0031] In a preferred embodiment, a positioning shaft is provided on the outer side of the lower annular surface, and one end of the clamping member is rotatably mounted on the positioning shaft.

[0032] In a preferred embodiment, since the radial shrinkage component in this invention needs to be connected to the upper connecting part to form an integral part in order to achieve the structural stability requirements, and in order to better realize the radial movement of the arc plate by using the clamping member, this invention contacts the clamping member with the arc plate rather than connecting it. Therefore, the arc plate needs to be connected to the upper connecting part in another way.

[0033] The present invention uses a closed end at the bottom of the upper shell, and the bottom of the fixing column is fixed to the bottom of the upper shell. The arc plate is connected to the upper connecting part by using the fixing column and spring.

[0034] In a preferred embodiment, the lower inner wall of the upper housing is provided with a protrusion, and the outer wall of the arc-shaped plate is provided with a groove that mates with the protrusion.

[0035] When the upper and lower connecting parts are connected, the arc-shaped plate fits tightly against the inner wall of the upper connecting part. At this point, the protrusion can be inserted into the slot. The protrusion is positioned above the card plate, meaning that the arc-shaped plate is connected to the upper connecting part at different axial positions, improving structural stability. When the upper and lower connecting parts are connected, the upper connecting part, the lower connecting part, and the radial contraction assembly form a unified force-bearing structure. Compared to direct surface contact, the insertion of the protrusion into the slot results in a stronger overall integrity of the upper connecting part, the lower connecting part, and the radial contraction assembly, leading to better stability under stress.

[0036] Specifically, it also includes a linear transmission mechanism and a slider for driving the rotation of the ring;

[0037] The slider is movably connected to the ring, and a linear transmission mechanism drives the slider to perform linear reciprocating motion. The direction of movement of the slider is perpendicular to the axis of the ring. The linear transmission mechanism includes an electric telescopic rod, a screw mechanism, a hydraulic cylinder, or a pneumatic cylinder.

[0038] Specifically, the side wall of the ring is provided with an arc-shaped through groove for installing the first sliding sleeve, and the size of the arc-shaped through groove can accommodate the displacement of the clamping member; or the ring includes an upper ring and a lower ring, which are connected by connecting posts, and the first sliding sleeve is disposed between the two connecting posts.

[0039] In a preferred embodiment, a pressing post is rotatably provided at the end of the clamping member that contacts the arc-shaped plate, and the pressing post and the arc-shaped plate are in line contact.

[0040] Since the clamping component achieves radial displacement through rotation, when there is line contact between the extrusion column and the arc plate, it can both drive the arc plate to perform radial displacement and avoid affecting the rotation of the clamping component.

[0041] In a preferred embodiment, the card plate includes an interconnected arc-shaped front end and a square rear end; the thickness of the arc-shaped front end is less than the height of the first through slot and the second through slot, and the thickness of the square rear end is equal to the height of the first through slot and the second through slot.

[0042] The aforementioned structure facilitates insertion of the card into the second through slot.

[0043] In a preferred embodiment, the card plate is always inserted into the first through slot, and the arc-shaped plate is connected to the upper connecting part through the combined action of the card plate and the fixing post, which has the advantage of good stability.

[0044] In a preferred embodiment, a buffer block is provided at the top of the lower connector.

[0045] The buffer block can be used as a reference for axial alignment of the clamping plate and the second through slot. That is, when the upper connecting part contacts the buffer block, it means that the clamping plate and the second through slot are aligned axially. By rotating the operating ring, the radial shrinking component expands radially, pushing the clamping plate into the second through slot, thus completing the connection between the upper and lower connecting parts. Using the buffer block as a reference has the advantage of buffering compared to using the top of the connecting part as a direct reference, avoiding rigid contact and collision between the upper and lower connecting parts during the downward movement of the upper connecting part.

[0046] In a preferred embodiment, after the card plate is inserted into the second through slot, the spring is in a natural state or in a compressed state to avoid the inward contraction restoring force generated when the spring is in a stretched state, which would pull the arc plate radially inward, causing the card plate to displace within the second through slot or even detach from the second through slot.

[0047] Preferably, the spring is in a compressed state. At this time, the spring has a restoring force when it is opened. This restoring force is used to ensure that the arc plate is tightly attached to the inside of the upper connecting part, and that the clamping plate is always in the second through groove.

[0048] When the card plate is inserted into the second through slot, and the spring is in its natural or compressed state, even if the spring fails, the arc plate will not move radially inward, causing the card plate to shift within the second through slot or even detach from it.

[0049] In a preferred embodiment, a magnetic adsorption structure can be provided on the outer wall of the arc-shaped plate and the clamping member. When the clamping plate is inserted into the second through slot, the magnetic adsorption structure is energized, enabling the arc-shaped plate and the clamping member to be connected through the magnetic adsorption structure. This further ensures that even if the spring fails, the arc-shaped plate will not move radially inward, causing the clamping plate to shift within the second through slot or even detach from it. Specifically, a magnetic block can be provided on the outer wall of the arc-shaped plate and the clamping member respectively. The magnetic adsorption force is used to connect the arc-shaped plate and the clamping member. The magnetic adsorption force is achieved by switching the two magnetic blocks on and off. When energized, the two magnetic blocks have mutual attraction. While the attraction between the two magnetic blocks when energized is existing technology, the magnetic field generated by the magnet when energized is used to attract metal. That is, the present invention can set one of the magnetic blocks to be a magnet and the other to be a metal block. When de-energized, the attraction between the two magnetic blocks is lost.

[0050] The above-mentioned method for using tools to handle accidents inside core drilling holes includes the following steps:

[0051] S1. When the drill string is stuck, stop the power head and disconnect the drill string from the power head;

[0052] S2. Lift the power head with a hydraulic cylinder to create space between the power head and the drill pipe for installing emergency handling tools inside the core drilling hole;

[0053] S3. Connect the lower connecting part to the drill pipe and the upper connecting part to the power head;

[0054] S4. By moving the hydraulic cylinder downwards, the upper connecting part moves downwards and is inserted into the lower connecting part;

[0055] S5. Rotate the ring of the operating adjustment component to expand the radial shrinkage component in the radial direction, push the card plate into the second through slot, and complete the connection between the upper and lower connecting parts.

[0056] S6. The power head is lifted by the hydraulic cylinder. When the lifting height of the power head reaches the set value, the ring of the operating adjustment component rotates in the opposite direction, and the radial contraction component contracts radially, causing the card plate to move out of the second through slot and the upper connection part and the lower connection part to separate.

[0057] S7. After the drill string is stretched and released, it generates elastic force. Under the action of elastic force, the drill string vibrates periodically, thus releasing the drill string from jamming.

[0058] The method of use of this invention is based on the above-mentioned core drilling hole accident handling tool, which can realize the separation of the drill string from the power head after the drill string is lifted to a certain height. Based on the fact that the drill string has a length of hundreds of meters, the "springing" of the drill string is achieved. In the four-step operation summarized in the procedure, this invention expands the first step. In the case of severe drill string jamming, this method can achieve the ideal state of retrieving all drill strings, or greatly improve the possibility of retrieving all drill strings, thus minimizing the potential risks brought about by subsequent steps.

[0059] In a preferred embodiment, in step S5, the lifting height of the power head is obtained as follows:

[0060] A distance sensor is installed on the power head to obtain the initial distance between the power head and the ground, as well as the distance between the power head and the ground during the lifting process. The difference between the two is taken as the lifting height of the power head.

[0061] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0062] 1. By setting up a detachable upper connecting part and a lower connecting part, the present invention can realize the separation of the drill string from the power head after the drill string is lifted to a certain height. Based on the drill string having a length of hundreds of meters, the "spring" of the drill string is realized, and the "spring" of the drill string is used to release the drill string from jamming.

[0063] 2. The connecting assembly of the present invention for realizing the detachable connection between the upper connecting part and the lower connecting part includes an adjusting assembly, a radial shrinking assembly and a clamping plate. The adjusting assembly realizes the radial displacement of the radial shrinking assembly by circumferential rotation. The present invention can realize the radial shrinking assembly to shrink in the radial direction and ensure the shrinkage stability of the radial shrinking assembly, avoiding the problem that the upper connecting part and the lower connecting part separate before the set displacement is reached during the drill string lifting process. Attached Figure Description

[0064] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0065] Figure 1 This is a schematic diagram of the existing drive unit used to drive the drill string in drilling.

[0066] Figure 2 This is a schematic diagram of the structure of the accident handling tool inside the core drilling hole in Embodiment 1 of the present invention;

[0067] Figure 3 This is a longitudinal sectional view of the accident handling tool inside the core drilling hole in Embodiment 1 of the present invention;

[0068] Figure 4This is a top view of the adjusting assembly and the radial shrinking assembly after the upper connecting part and the lower connecting part are connected in Embodiment 1 of the present invention;

[0069] Figure 5 This is a top view of the adjusting assembly and the radial shrinking assembly after the upper connecting part and the lower connecting part are disconnected in Embodiment 1 of the present invention;

[0070] Figure 6 This is a schematic diagram of the adjustment component in Embodiment 1 of the present invention;

[0071] Figure 7 This is a schematic diagram of the clamping component in Embodiment 4 of the present invention;

[0072] Figure 8 This is a schematic diagram of the card plate structure in Embodiment 3 of the present invention;

[0073] Figure 9 This is a schematic diagram of the device for driving the rotation of the ring in Embodiment 1 of the present invention;

[0074] Figure 10 This is a schematic diagram of the linear transmission mechanism driving the ring to rotate in Embodiment 2 of the invention.

[0075] The attached diagram shows the markings and corresponding component names:

[0076] 1-Upper connecting part; 2-Lower connecting part; 3-Buffer block; 4-Adjusting component; 5-Radial contraction component; 6-Clamping plate;

[0077] 11-Upper shell; 12-Internal threaded part; 13-Annular cavity; 14-Protrusion;

[0078] 21-Lower housing; 22-Second through groove; 23-External threaded part;

[0079] 41-Ring; 42-Connecting plate; 43-Connecting column; 44-First sliding sleeve; 45-Clamping element; 46-Pin; 47-Linear transmission mechanism; 48-Positioning shaft; 49-Slider;

[0080] 411-Upper ring; 412-Lower ring; 413-Drive shaft; 414-Driving wheel; 415-Rack; 416-U-shaped plate; 417-Column;

[0081] 451-Pressure plate; 452-Through hole; 453-U-shaped end; 454-Extrusion column; 455-Connecting shaft;

[0082] 51-Arc-shaped plate; 52-Spring; 53-Fixing post;

[0083] 61 - Arc-shaped front end; 62 - Square rear end;

[0084] 100-Power head; 200-Drill pipe; 300-Mast; 400-Second sliding sleeve; 500-Cylinder barrel; 600-Cylinder piston rod; 700-Base. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. The embodiments described below are some, but not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0086] In the following description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, materials, or methods are not specifically described to avoid obscuring the invention. Unless otherwise specified, the materials, instruments, and reagents used in the following embodiments are commercially available. Unless otherwise specified, the techniques used in the embodiments are conventional methods well known to those skilled in the art.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0088] Example 1:

[0089] Existing drilling drive devices for driving the drill string, such as Figure 1As shown, the system includes a power head 100, a mast 300, a second sliding sleeve 400, a hydraulic cylinder, and a base 700. The mast 300 is vertically mounted on the base 700, and the second sliding sleeve 400 is slidably mounted on the mast 300. The second sliding sleeve 400 is driven by the hydraulic cylinder to move up and down on the mast 300. The hydraulic cylinder includes a cylinder barrel 500 and a piston rod 600. The cylinder barrel 500 is connected to the second sliding sleeve 400, and the end of the piston rod 600 away from the cylinder barrel 500 is connected to the base 700. When the piston rod 600 extends, because the end of the piston rod 600 is fixed, the cylinder barrel 500 moves upward, allowing the cylinder to move vertically. The second sliding sleeve 400 is moved upwards on the mast 300. The power head 100, including a hydraulic motor, is connected to the second sliding sleeve 400 and can move up and down with it. In use, the power output end of the power head 100 is connected to the drill rod 200 at the top of the drill string via a threaded connection. The drill rod 200 is a steel pipe drill rod with threads at both ends. Two adjacent drill rods 200 are connected sequentially to form a drill string. The top of the drill string is connected to the power output end of the power head 100 via a threaded connection, and the bottom of the drill string is connected to the drill bit. The drill bit advances by rotating the drill string driven by the power head 100. For core drilling, the length of the drill string can reach several hundred meters (mostly within 1500 meters).

[0090] During core drilling operations, issues such as rockfalls, collapses, or sand accumulation on the borehole wall can cause the drill string to become stuck or buried at some point. If the drill string is not severely obstructed, and the first steps of conventional methods such as "lifting," "drilling," "vibrating," "retrieving," and "reversing" fail to resolve the issue, there may be residual drill string inside the borehole. Subsequent handling faces higher risks and may lead to other unforeseen accidents, ultimately preventing the successful removal of the residual drill string.

[0091] like Figures 2-6 As shown, to achieve drill string unsticking, this embodiment provides a core drilling borehole accident handling tool. This tool is installed between the drill string and the power head 100. When the power head 100 lifts the drill string a certain distance, the tool can separate the drill string from the power head 100, thereby achieving the "springing" of the drill string. The tool utilizes this "springing" to unstick the drill string. The tool includes:

[0092] The upper connecting part 1 and the lower connecting part 2 are separable. The upper part of the upper connecting part 1 is connected to the power head 100; the lower part of the lower connecting part 2 is connected to the drill rod 200 at the top of the drill rod column. Both the upper connecting part 1 and the lower connecting part 2 are cylindrical structures. In use, the lower part of the upper connecting part 1 can be inserted into the lower connecting part 2, and the two are coaxially arranged. The upper connecting part 1 and the lower connecting part 2 are detachably connected by a connecting component.

[0093] The upper connecting part 1 includes an upper housing 11, which is a cylindrical structure with an open top. The upper inner wall of the upper housing 11 has an internal thread forming an internal thread portion 12. In use, the power output end of the power head 100 is inserted into the upper housing 11, and a threaded connection is achieved through the internal thread portion 12. After the upper connecting part 1 is connected to the power head 100, the upper housing 11 has a space below the power output end of the power head 100 for installing connecting components. The lower part of the upper housing 11 is located inside the lower connecting part 2. Preferably, as follows... Figure 3 As shown, the middle part of the upper housing 11 protrudes radially outward to form an annular cavity 13. The annular cavity 13 has an upper annular surface, a lower annular surface and a side annular surface. The internal thread part 12 is provided above the upper annular surface and below the lower annular surface. The upper housing 11 is inserted into the lower connecting part 2. A first through groove is provided on the side wall of the upper housing 11 inserted into the lower connecting part 2. The annular cavity 13 provided in this embodiment facilitates the installation of connecting components.

[0094] The lower connecting part 2 includes a lower housing 21, which is a cylindrical structure. The top of the lower housing 21 is an open end for inserting the upper connecting part 1. The lower part of the lower housing 21 is provided with an external thread forming an external thread portion 23, which is used to form a threaded connection with the drill rod 200. A second through groove 22 is provided on the side wall of the lower housing 21. When the upper connecting part 1 is inserted into the lower connecting part 2, the second through groove 22 and the first through groove are arranged opposite to each other. Preferably, the outer diameter of the portion of the upper housing 11 inserted into the lower housing 21 is equal to the inner diameter of the lower housing 21, so that when the upper housing 11 is inserted into the lower housing 21, the upper housing 11 and the lower housing 21 are tightly attached.

[0095] A connecting assembly is used to enable a detachable connection between the upper connecting part 1 and the lower connecting part 2. The connecting assembly includes an adjusting assembly 4, a radial shrinking assembly 5, and a retaining plate 6.

[0096] The radial contraction assembly 5 includes at least two arc-shaped plates 51, which are coaxially arranged within the upper housing 11. Fixing posts 53 are provided on the inner sides of the arc-shaped plates 51, and the fixing posts 53 are fixedly connected to the upper connecting part 1. Specifically, the bottom of the upper housing 11 is a closed end, and the fixing posts 53 are vertically fixed to the bottom of the upper housing 11. The arc-shaped plates 51 and the fixing posts 53 are connected by springs 52; the connection between the arc-shaped plates 51 and the upper housing 11 is achieved through the fixing posts 53 and the springs 52. In a specific example, such as... Figure 4 and Figure 5 As shown, the radial contraction assembly 5 includes three arc-shaped plates 51, each arc-shaped plate 51 corresponding to a spring 52.

[0097] Each of the card plates 6 is correspondingly disposed on the outer wall of the arc-shaped plate 51. The card plates 6 can pass through the first through groove and the second through groove 22 in sequence to connect the upper connecting part 1 and the lower connecting part 2. When it is necessary to connect the upper connecting part 1 and the lower connecting part 2, the radial contraction component 5 is radially expanded by the adjustment component 4, so that the arc-shaped plate 51 moves radially outward, allowing the card plate 6 to be inserted into the second through groove 22, thus connecting the upper connecting part 1 and the lower connecting part 2. When it is necessary to separate the upper connecting part 1 and the lower connecting part 2, the radial contraction component 5 is radially contracted by the adjustment component 4, so that the arc-shaped plate 51 moves radially inward, allowing the card plate 6 to be inserted or removed from the second through groove 22. Preferably, when the card plate 6 is inserted into the second through groove 22, the arc-shaped plate 51 is in close contact with the upper housing 11. When the upper connecting part 1 and the lower connecting part 2 are separated, the card plate 6 is always placed in the first through groove.

[0098] Adjustment component 4 includes a ring 41, a first sliding sleeve 44, and a clamping member 45;

[0099] The ring 41 is rotatably disposed within the upper connecting portion 1. Specifically, the ring 41 is slidably disposed on the lower annular surface or the side annular surface of the annular cavity 13. Preferably, as shown below... Figure 4 , Figure 5 As shown, the ring 41 is slidably disposed on the lower annular surface of the annular cavity 13. Specifically, an annular groove can be provided on the lower annular surface, and a sliding block that cooperates with the annular groove is provided on the lower end surface of the ring 41, so that the ring 41 can be rotated by external force. Furthermore, the ring 41 is coaxially arranged on the outside of the arc plate 51, and the first sliding sleeve 44 is hinged to the ring 41. The specific hinge method includes setting a pin 46 at the top and / or bottom of the first sliding sleeve 44, and the pin 46 is rotatably arranged on the ring 41. The first sliding sleeve 44 corresponds one-to-one with the arc plate 51. The clamping member 45 is slidably arranged inside the first sliding sleeve 44. One end of the clamping member 45 is rotatably connected to the inside of the upper connecting part 1, and the other end is in contact with the arc plate 51. When the ring 41 rotates, the clamping member 45 rotates around its rotation connection point and pushes the arc plate 51 to move radially inward. The restoring force of the spring 52 is used to realize the radial outward movement of the arc plate 51. In a specific case, a positioning shaft 48 is provided on the lower annular surface of the annular cavity 13 on the outside of the ring 41, and one end of the clamping member 45 is rotatably arranged on the positioning shaft 48.

[0100] The method for hinged first sliding sleeve 44 on ring 41 and enabling displacement of clamping member 45 includes: the side wall of ring 41 is provided with an arc-shaped through groove for mounting first sliding sleeve 44, the size of the arc-shaped through groove being able to accommodate displacement of clamping member 45; or as follows Figure 6As shown, the ring 41 includes an upper ring 411 and a lower ring 412, which are connected by connecting posts 43. A first sliding sleeve 44 is disposed between the two connecting posts 43, and the distance between the two connecting posts 43 can accommodate the displacement of the clamping member 45. The clamping member 45 can be a conventional rod or plate, or other structures, as long as it can achieve contact with the arc-shaped plate 51.

[0101] There are several ways to use external force to drive the rotation of ring 41, such as using a motor in conjunction with gear transmission, for example... Figure 9 As shown, the drive shaft 413 of the motor drives the drive wheel 414 to rotate, and the drive wheel 414 drives the rack 415 to rotate. The rack 415 is set on the outer wall of the ring 41, and the motor is installed on the side annular surface of the annular cavity 13.

[0102] In this embodiment, based on the structural design of the adjusting component 4, to facilitate the radial movement of the arc-shaped plate 51, when the clamping plate 6 is inserted into the second through slot 22, the spring 52 is in a natural state or a compressed state, that is, when the radial contraction component 5 is in a radial contraction state, such as... Figure 5 As shown, when the spring 52 is in a compressed state, it is only necessary to adjust the component 4 to rotate so that the clamping member 45 can make room for the arc plate 51 to move radially outward. The restoring force of the spring 52 can be used to push the arc plate 51 to move radially outward. When it is necessary to separate the connection between the upper connecting part 1 and the lower connecting part 2, the adjusting component 4 rotates in the opposite direction so that the clamping member 45 can push the arc plate 51 to move radially inward.

[0103] In a preferred embodiment, the lower inner wall of the upper housing 11 is provided with a protrusion 14, and the outer wall of the arc-shaped plate 51 is provided with a groove that mates with the protrusion 14. When the retaining plate 6 is inserted into the second through slot 22, the protrusion 14 is inserted into the groove, which helps to improve the overall stress stability of the connection between the upper connecting part 1 and the lower connecting part 2.

[0104] In a preferred embodiment, a buffer block 3 is provided on the top of the lower housing 21.

[0105] Example 2:

[0106] This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that the structure used to drive the rotation of the ring 41 is different. In this embodiment, as shown... Figure 4 , Figure 5 As shown, it also includes a linear transmission mechanism 47 and a slider 49 for driving the ring 41 to rotate;

[0107] The slider 49 is movably connected to the ring 41, and the linear transmission mechanism 47 drives the slider 49 to perform linear reciprocating motion. The direction of movement of the slider 49 is perpendicular to the axial direction of the ring 41. Specifically, as shown... Figure 10As shown, a U-shaped plate 416 is provided on the outer wall of the ring 41, and a column 417 is provided at the bottom of the slider 49. The column 417 is placed inside the U-shaped plate 416 (the distance between the two side walls of the U-shaped plate 416 is equal to the diameter of the column 417). When the slider 49 moves linearly, the column 417 is blocked by the side wall of the U-shaped plate 416, which applies force to the U-shaped plate 416 and pushes the ring 41 to rotate. Within the rotation range of the ring 41, the column 417 is always placed inside the U-shaped plate. Within the reciprocating movement range of the slider 49, the radial shrinkage component 5 can be shrinked and expanded, that is, the card plate 6 can be inserted into the second through slot 22 and pulled out of the second through slot 22.

[0108] Specifically, the linear transmission mechanism 47 includes an electric telescopic rod, a screw mechanism, a hydraulic cylinder, or a pneumatic cylinder. For example, when the linear transmission mechanism 47 is a screw mechanism, it is set on the screw of the screw mechanism of the slider 49, and the rotation of the screw mechanism drives the slider 49 to perform linear displacement on the screw.

[0109] Example 3:

[0110] This embodiment is based on Embodiment 1 or Embodiment 2, and further defines the structure of the card plate 6, such as... Figure 8 As shown, the card plate 6 includes an arc-shaped front end 61 and a square rear end 62 connected to each other; the thickness of the arc-shaped front end 61 is less than the height of the first through groove and the second through groove 22, and the thickness of the square rear end 62 is equal to the height of the first through groove and the second through groove 22.

[0111] The aforementioned structure of the card plate 6 makes it easier to insert into the second through slot 22.

[0112] Example 4:

[0113] This embodiment is based on embodiment 1 or embodiment 2. The end of the clamping member 45 that contacts the arc plate 51 is rotatably provided with an extrusion column 454, and the extrusion column 454 and the arc plate 51 are in line contact.

[0114] Specifically, such as Figure 7 As shown, the clamping member 45 includes a pressure plate 451. One end of the pressure plate 451 is provided with a through hole 452. The positioning shaft 48 is disposed in the through hole 452 to realize the rotation of the pressure plate 451 around the positioning shaft 48. The other end of the pressure plate 451 is provided with a U-shaped end 453. A connecting shaft 455 is provided between the two side walls of the U-shaped end 453. An extrusion column 454 is sleeved on the connecting shaft 455.

[0115] Since the clamping member 45 achieves radial displacement by rotation, when the extrusion column 454 and the arc plate 51 are in line contact, the radial displacement of the pressure plate 451 can be achieved to push the arc plate 51 to perform radial displacement, while avoiding affecting the rotation of the clamping member 45.

[0116] Example 5:

[0117] This embodiment is based on embodiment 4. A magnetic adsorption structure is provided on the outer wall of the arc plate 51 and the extrusion column 454. When the card plate 6 is inserted into the second through slot 22, the magnetic adsorption structure is energized, so that the arc plate 51 and the extrusion column 454 are connected by the magnetic adsorption structure. This ensures that even if the spring 52 fails, the arc plate 51 will not move radially inward, causing the card plate 6 to be displaced in the second through slot 22 or even detached from the second through slot 22.

[0118] Specifically, a magnetic block can be set on the outer wall of the arc plate 51 and the extrusion column 454 respectively, and the arc plate 51 and the extrusion column 454 can be connected by magnetic adsorption force.

[0119] Example 6:

[0120] A method for handling accidents inside core drilling holes, and also a method for using tools for handling accidents inside core drilling holes, includes the following steps:

[0121] S1. When the drill string is stuck, stop the power head 100 and disconnect the drill pipe 200 from the power head 100;

[0122] S2. Lift the power head 100 with a hydraulic cylinder to leave space between the power head 100 and the drill rod 200 for installing the accident handling tool inside the core drilling hole;

[0123] S3. Connect the lower connecting part 2 to the drill rod 200, and connect the upper connecting part 1 to the power head 100;

[0124] S4. By moving the hydraulic cylinder downwards by force head 100, the upper connecting part 1 moves downwards and is inserted into the lower connecting part 2;

[0125] S5. Rotate the ring 41 of the operating adjustment component 4 to expand the radial shrinkage component 5 in the radial direction, push the card plate 6 into the second through slot 22, and complete the connection between the upper connecting part 1 and the lower connecting part 2.

[0126] S6. The power head 100 is lifted by the hydraulic cylinder. When the lifting height of the power head 100 reaches the set value, the ring 41 of the operating adjustment component 4 rotates in the opposite direction, and the radial contraction component 5 contracts radially, causing the clamping plate 6 to move out of the second through slot 22, thus disengaging the upper connecting part 1 and the lower connecting part 2. The lifting height of the power head 100 is obtained as follows:

[0127] A distance sensor is installed on the power head 100. The distance sensor is used to obtain the distance between the power head 100 and the ground in the initial state and the distance between the power head 100 and the ground during the lifting process. The difference between the two is used as the lifting height of the power head 100. The distance sensor can be any existing technology, such as infrared distance measurement or laser distance measurement.

[0128] The lifting height setting is related to the hole depth. Generally, the stretch of the drill string for a hole depth of 500 meters is about 15 cm.

[0129] S7. After the drill string is stretched and released, it generates elastic force. Under the action of elastic force, the drill string vibrates periodically, thus releasing the drill string from jamming.

[0130] In practical use, a corresponding control system can be designed, including a controller. The distance between the power head 100 and the ground obtained by the distance measuring sensor is input into the controller to calculate the lifting height. When the lifting height reaches the set value, the controller controls the structure used to drive the ring 41 to rotate, so as to separate the upper connecting part 1 and the lower connecting part 2. When a magnetic adsorption structure is set on the outer wall of the arc plate 51 and the extrusion column 454, the controller can also control the power supply and de-energization of the magnetic adsorption block.

[0131] This embodiment uses the principle of "spring" to release the drill pipe from sticking:

[0132] The elastic potential energy stored in the drill string after it is stretched is converted into kinetic energy (stress wave) and released when it suddenly disengages from the device. The free end (the drill string above the jammed position) begins to accelerate towards the equilibrium position (natural length). At this time, the elastic force is at its maximum, and the acceleration of the free end is at its maximum.

[0133] When the free end passes the equilibrium position, the elastic force is zero, and the velocity reaches its maximum value. Due to inertia, the free end continues to move in the opposite direction, causing the drill string to be compressed;

[0134] When the drill string is compressed, kinetic energy is converted into instantaneous impact stress. The impact force causes localized stress concentration in the rock stuck at the bottom of the hole, which breaks when it exceeds the rock's compressive strength. At the same time, the gravitational wave is reflected as an in-phase wave at the fixed end (the stuck point) and as an out-of-phase wave at the borehole opening (the free end), forming a periodic gravitational wave.

[0135] At the beginning of the above process, the downward (upward) impact force is large, which then decays rapidly. On the ground, the drill string exhibits violent vibrations that decay rapidly.

[0136] Based on theoretical analysis and practical experience, the specific mechanism for unblocking the bottom of the drill string is as follows: (1) The instantaneous impact generated by the violent vibration of the drill string in an extreme time causes the stuck rock cuttings to break or loosen; (2) High-frequency vibration reduces the static friction coefficient, making it easier for the drill string to detach from the stuck point (similar to the effect of vibration pile driving); (3) Vibration causes the contact points between the drill string and the borehole wall to redistribute, reducing local squeezing pressure. Whether the bottom of the drill string is stuck depends mainly on two factors: first, whether the structure of the drill string itself is easy to get stuck; second, whether there is any stuck material. Since the outer diameter of the drill string used for wireline coring is uniform throughout, and only the outer diameter is slightly larger at the drill bit or reamer connected at the bottom, the stuck position is often at the drill bit and reamer. At the same time, since wireline coring is mostly used for rock formations, the stuck material is mostly loose fragments that have fallen from the borehole wall. If the jamming is caused by loose fragments, vibration can successfully release the blockage. However, if the blockage at the bottom of the borehole is extremely severe (such as being completely wedged into hard rock or buried over a long distance), the vibration energy may not be sufficient to break the jamming structure, and thus, release the blockage. This embodiment is mainly applicable to localized blockages at the bottom of the drill string or at the drill bit or reamer caused by loose fragments.

[0137] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0138] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A tool for handling accidents inside a core drilling hole, characterized in that, include: The upper connecting part (1) is connected to the power head (100) at its upper part; The lower connecting part (2) is connected to the drill rod (200) at its lower part; A connecting assembly is used to realize the detachable connection between the upper connecting part (1) and the lower connecting part (2), the connecting assembly including an adjusting assembly (4), a radial shrinking assembly (5) and a retaining plate (6). The radial shrinkage assembly (5) includes at least two arc-shaped plates (51), and multiple arc-shaped plates (51) are coaxially arranged in the upper connecting part (1). The inner side of the multiple arc-shaped plates (51) is provided with a fixing post (53), and the fixing post (53) is fixedly connected to the upper connecting part (1). The arc-shaped plates (51) and the fixing post (53) are connected by a spring (52). The card plates (6) are arranged one-to-one on the outer wall of the arc plate (51); the side walls of the upper connecting part (1) and the lower connecting part (2) are respectively provided with a first through groove and a second through groove (22) for passing through the card plates (6). The adjustment assembly (4) includes a ring (41), a first sliding sleeve (44), and a clamping member (45). The ring (41) is rotatably disposed inside the upper connecting part (1) and coaxially disposed outside the arc plate (51). The first sliding sleeve (44) is hinged to the ring (41). The first sliding sleeve (44) corresponds one-to-one with the arc plate (51). The clamping member (45) is slidably disposed inside the first sliding sleeve (44). One end of the clamping member (45) is rotatably connected to the inside of the upper connecting part (1), and the other end is in contact with the arc plate (51). When the ring (41) rotates, the clamping member (45) rotates around its rotation connection point and pushes the arc plate (51) to move radially inward. The restoring force of the spring (52) is used to realize the arc plate (51) to move radially outward.

2. The tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, The upper connecting part (1) includes an upper housing (11), the upper part of which is provided with an internal thread (12), and the lower part of which is provided inside the lower connecting part (2).

3. The tool for handling accidents inside a core drilling hole according to claim 2, characterized in that, The middle part of the upper housing (11) protrudes outward along the radial direction to form an annular cavity (13). The annular cavity (13) has an upper annular surface, a lower annular surface and a side annular surface. The ring (41) is slidably disposed on the lower annular surface or the side annular surface.

4. The tool for handling accidents inside a core drilling hole according to claim 3, characterized in that, A positioning shaft (48) is provided on the lower annular surface outside the ring (41), and one end of the clamping member (45) is rotatably mounted on the positioning shaft (48).

5. The tool for handling accidents inside a core drilling hole according to claim 2, characterized in that, The bottom of the upper housing (11) is a closed end, and the bottom of the fixing column (53) is fixed to the bottom of the upper housing (11).

6. The tool for handling accidents inside a core drilling hole according to claim 2, characterized in that, The lower inner wall of the upper housing (11) is provided with a protrusion (14), and the outer wall of the arc plate (51) is provided with a groove that cooperates with the protrusion (14).

7. The tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, It also includes a linear transmission mechanism (47) and a slider (49) for driving the ring (41) to rotate. The slider (49) is movably connected to the ring (41), and the linear transmission mechanism (47) is used to drive the slider (49) to perform linear reciprocating motion. The direction of movement of the slider (49) is perpendicular to the axial direction of the ring (41).

8. A tool for handling accidents inside a core drilling hole according to claim 7, characterized in that, The linear transmission mechanism (47) includes an electric telescopic rod, a screw mechanism, a hydraulic cylinder, or a pneumatic cylinder.

9. A tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, The sidewall of the ring (41) is provided with an arc-shaped through groove for installing the first sliding sleeve (44), the size of which can adapt to the displacement of the clamping member (45); or the ring (41) includes an upper ring (411) and a lower ring (412), the upper ring (411) and the lower ring (412) are connected by a connecting post (43), and the first sliding sleeve (44) is disposed between the two connecting posts (43).

10. A tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, The end of the clamping member (45) that contacts the arc plate (51) is rotatably provided with an extrusion column (454), and the extrusion column (454) and the arc plate (51) are in line contact.

11. A tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, The card plate (6) includes an arc-shaped front end (61) and a square rear end (62) connected to each other; the thickness of the arc-shaped front end (61) is less than the height of the first through slot and the second through slot (22), and the thickness of the square rear end (62) is equal to the height of the first through slot and the second through slot (22).

12. The tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, A buffer block (3) is provided on the top of the lower connecting part (2).

13. The tool for handling accidents inside a core drilling hole according to claim 1, characterized in that, When the card plate (6) is inserted into the second through slot (22), the spring (52) is in a natural state or in a compressed state.

14. The method of using the core drilling borehole accident handling tool according to any one of claims 1-13, characterized in that, Includes the following steps: S1. When the drill string is stuck, stop the power head (100) and disconnect the drill string (200) from the power head (100); S2. The power head (100) is lifted by the hydraulic cylinder, so that space is left between the power head (100) and the drill rod (200) for installing the accident handling tool inside the core drilling hole; S3. Connect the lower connecting part (2) to the drill rod (200) and connect the upper connecting part (1) to the power head (100); S4. The power head (100) is moved down by the hydraulic cylinder, so that the upper connecting part (1) moves downward and is inserted into the lower connecting part (2); S5. Rotate the ring (41) of the adjustment component (4) to make the radial shrinkage component (5) expand radially, push the card plate (6) into the second through slot (22) to complete the connection between the upper connecting part (1) and the lower connecting part (2); S6. The power head (100) is lifted by the hydraulic cylinder. When the lifting height of the power head (100) reaches the set value, the ring (41) of the adjustment component (4) is rotated in the opposite direction. The radial shrinkage component (5) shrinks in the radial direction, so that the card plate (6) moves out of the second through groove (22) and the upper connecting part (1) and the lower connecting part (2) are separated. S7. After the drill string is stretched and released, it generates elastic force. Under the action of elastic force, the drill string vibrates periodically, thus releasing the drill string from jamming.

15. The method of use according to claim 14, characterized in that, In step S5, the lifting height of the power head (100) is obtained as follows: A distance sensor is installed on the power head (100). The distance sensor is used to obtain the distance between the power head (100) and the ground in the initial state and the distance between the power head (100) and the ground during the lifting process. The difference between the two is used as the lifting height of the power head (100).

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