Core drill bit device

Abstract

The present application relates to a kind of coring drill bit devices, including punch assembly, stabilizing assembly and coring assembly, coring assembly is arranged in the inner tube formed by punch assembly, stabilizing assembly is arranged between the outer wall of coring assembly and the inner wall of punch assembly, its beneficial effect is that the wear amount of second position is larger when coring drill bit device performs punch action, and the wear amount of first position is almost negligible when performing core rock action, can be matched with the way of rope coring to take out coring assembly together with core from punch assembly and stabilizing assembly, so the wear state of second position can be measured each time coring is salvaged, and the replacement of second position is completed, compared with the replacement of stabilizing member by the way of whole lifting drill in conventional coring drill, replacement time is greatly shortened, and it is favorable to improve punch efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of geological exploration, and more particularly to a core drilling bit device. Background Technology

[0002] In conventional coring tools, the drill bit and the reamer are connected by threads. As the drill bit threads tighten during drilling, and the inside of the drill bit contains flushing fluid carrying rock debris, rock debris is easily formed at the connection thread, making the drill bit difficult to disassemble and the connection thread easily damaged.

[0003] In conventional coring drills, the stabilizer is located between the outer tube and the inner core tube, serving to radially support the inner core tube. Since the outer tube needs to drive the drill bit to rotate, the inner core tube should not rotate to prevent core disturbance and ensure core integrity. However, the actual state of the stabilizer, located in the middle, cannot be determined, making it difficult to determine the position of its friction surface. Therefore, the stabilizer is generally a wear part, made of copper. If the stabilizer is not replaced in time after a certain degree of wear, the axis of the drill bit will be misaligned with the axis of the inner core tube, making it difficult for the core to enter the inner core tube smoothly and easily causing core blockage. Each time the stabilizer is replaced, the entire drill string needs to be lifted to the surface. As the drilling distance increases, the replacement time may be 2-4 hours, seriously affecting drilling efficiency. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a core drilling bit device, which solves the technical problem in the prior art that when replacing the stabilizing component, the entire drill string needs to be lifted to the surface, and the replacement time is extended as the drilling distance increases, which seriously affects the drilling efficiency.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, the present invention provides a core-taking drill bit device, comprising a drilling assembly, a stabilizing assembly, and a core-taking assembly. The core-taking assembly is disposed within the inner tube formed by the drilling assembly, and the stabilizing assembly is disposed between the outer wall of the core-taking assembly and the inner wall of the drilling assembly. Torque can be transmitted between the drilling assembly and the stabilizing assembly, and the core-taking assembly can be extracted from the stabilizing assembly. A flow channel for the passage of a medium liquid is also formed between the stabilizing assembly and the core-taking assembly, and the medium liquid can run from one end of the drilling assembly to the other end of the drilling assembly and be output. The first position of the stabilizing assembly is in frictional contact with the second position of the core-taking assembly, and the first position is made of a wear-resistant material, while the second position is made of a consumable material. While the stabilizing assembly rotates with the drilling assembly, the core-taking assembly does not rotate.

[0009] In this technical solution, the core drilling device includes a drilling assembly, a stabilizing assembly, and a core-taking assembly, which are nested together. The drilling assembly is on the outermost side, the core-taking assembly is on the innermost side, and the stabilizing assembly is located between the inner wall of the drilling assembly and the core-taking assembly, providing support for the core-taking assembly and maintaining its stability during the drilling process.

[0010] There is a flow channel between the stabilizing component and the core drilling component. During the drilling process, the medium fluid, such as a relatively clear flushing fluid, is input into the core drilling device through this flow channel and is finally output through the drilling end of the drilling component. The flushing fluid can flush the bottom of the hole, reduce the temperature, and mix some impurities into the flushing fluid. The impurities mixed with the flushing fluid eventually flow out of the hole from the gap between the hole wall and the outer wall of the drilling component. After treatment, they can rejoin the circulation of the input flow channel.

[0011] The first and second positions are the actual supporting positions between the coring assembly and the stabilizing assembly. The second position is designated as a wear part relative to the first position. When the coring drill bit performs the drilling action, the stabilizing assembly moves with the drilling assembly, while the coring assembly does not move. Therefore, friction occurs between the first and second positions, causing wear to both. However, since the first position is more wear-resistant than the second position, the wear on the second position is greater during the drilling action, while the wear on the first position is almost negligible. When performing the core retrieval action, the coring assembly along with the core can be removed from the drilling assembly and the stabilizing assembly using a wireline coring method. Therefore, the wear condition of the second position can be measured each time the core is retrieved, and the second position can be quickly replaced. Compared with the conventional method of replacing the stabilizing component by lifting the entire drill bit in a coring tool, the replacement time is significantly shortened, which helps to improve drilling efficiency.

[0012] In one technical solution of the present invention, the drilling assembly includes a drill bit, a reamer, a first coupling and a second coupling connected in sequence along the axis, and at least the drill bit and the reamer are sealed at the radially outer position of the drilling assembly by a sealing angle; the core drilling device also includes a sealing assembly, which is located on both sides of the threaded engagement position between the drill bit and the reamer, and corresponds to the radially inner position of the drilling assembly.

[0013] In this technical solution, the drilling assembly includes a drill bit, a reamer, a first coupling, and a second coupling connected in sequence along the axis. The drill bit performs the tunneling action when it is running, the reamer expands the hole after the drill bit has finished tunneling, and the first coupling and the second coupling play the role of transmitting torque, which is used to transmit the torque from the surface to the drill bit downhole.

[0014] Specifically, the drill bit can be configured as a diamond-encrusted core drill bit with a wide horseshoe-shaped lip. Its nozzle distribution is conducive to achieving slag removal inside the hole. The outer surface of the drill bit has external threads for connection with the internal threads of the reamer. There is a 75° sealing angle at the thread to prevent the flushing fluid on the outer surface from entering the inside of the thread.

[0015] Meanwhile, the core drilling device also includes a sealing assembly. The sealing angle is used to prevent external flushing fluid from flowing into the threaded connection between the drill bit and the reamer, while the sealing assembly is used to prevent internal flushing fluid from flowing into the threaded connection between the drill bit and the reamer. With the combined action of internal and external sealing, rock cuttings in the flushing fluid can be effectively prevented from entering the drill bit connection threads, reducing the difficulty of drill bit disassembly and the degree of thread damage, thereby improving the reliability of the entire drilling operation and increasing work efficiency.

[0016] More specifically, a 75° sealing angle can be set between the reamer and the first coupling, and between the first coupling and the second coupling. The reamer is threaded with the first coupling through an internal thread, and the first coupling is also threaded with the second coupling through an internal thread.

[0017] In one embodiment of the present invention, the inner surface of the drill bit has a first cylindrical surface, a first conical surface, a first stepped surface, and a second conical surface that are interconnected, the taper of the first conical surface being greater than the taper of the second conical surface; the stabilizing component includes a stabilizing ring, the outer surface of which has a second cylindrical surface, a second stepped surface, a third cylindrical surface, and a fourth cylindrical surface that are interconnected, the diameter of the second cylindrical surface being greater than the diameter of the third cylindrical surface, and the diameter of the third cylindrical surface being greater than the diameter of the fourth cylindrical surface; wherein, the second cylindrical surface and the second conical surface are in clearance fit, the third cylindrical surface and the inner wall of the first coupling are in clearance fit, the fourth cylindrical surface is capable of transmitting torque between itself and the second coupling, and the axial position of the stabilizing ring is defined by the first stepped surface and the flange of the second coupling.

[0018] In this technical solution, the inner surface of the drill bit has a first cylindrical surface, a first conical surface, a first stepped surface, and a second conical surface that are interconnected. Flow grooves are formed on the first cylindrical surface and the first conical surface to allow flushing fluid to pass through. The first conical surface and the second conical surface are separated by the first stepped surface, and the taper of the first conical surface is greater than that of the second conical surface. Setting the taper of the first conical surface to be larger is to facilitate better convergence of the flushing fluid into the flow groove. Furthermore, the larger taper design of the first conical surface is also conducive to obtaining higher output pressure of the flushing fluid, thereby fully achieving flushing of the bottom of the hole.

[0019] Setting the second conical surface to have a smaller taper allows for better fit with the stabilizing ring, preventing large gaps between them and thus improving the stability of the stabilizing ring within the drill bit. At the same time, the drill bit will not rub against the stabilizing ring during disassembly, reducing the difficulty of disassembling the drill bit.

[0020] The outer surface of the stabilizing ring has a second cylindrical surface, a second stepped surface, a third cylindrical surface, and a fourth cylindrical surface that are connected to each other. The second cylindrical surface can be clearance-fitted with the second conical surface, and the third cylindrical surface can be clearance-fitted with the inner wall of the first coupling, thereby realizing torque transmission between the first coupling and the third cylindrical surface. This allows the stabilizing ring to rotate together with the perforated assembly. The axial position of the stabilizing ring can be defined by the flange of the second coupling on the first stepped surface.

[0021] Specifically, the stabilizing ring can be made of copper to improve its ease of manufacturing.

[0022] In one technical solution of the present invention, a sealing groove is provided on the third cylindrical surface, and the sealing assembly includes at least a first sealing ring and a second sealing ring. The first sealing ring is disposed between the stabilizing ring and the first step surface, and the second sealing ring is disposed in the sealing groove.

[0023] In this technical solution, a sealing groove is provided on the third cylindrical surface. The sealing groove is a circumferential groove. The first sealing ring is located at the first step surface, which plays a sealing role between the first step surface and the end face of the stabilizing ring. The second sealing ring is located at the sealing groove, which plays a sealing role between the outer wall of the stabilizing ring and the first coupling. In this way, both sides of the internal position of the mating thread of the drill bit and the first coupling are sealed. With the help of the sealing angle, it can effectively prevent rock cuttings in the flushing fluid from entering the drill bit connecting thread, reduce the difficulty of drill bit disassembly and the degree of thread damage, thereby improving the reliability of the entire drilling operation and improving work efficiency.

[0024] In one technical solution of the present invention, the stabilizing component further includes a bushing and a retaining ring. The inner surface of the stabilizing ring has a fifth cylindrical surface, a third stepped surface, and a sixth cylindrical surface that are interconnected, wherein the diameter of the fifth cylindrical surface is larger than the diameter of the sixth cylindrical surface. The fifth cylindrical surface is interference-fitted with the bushing, and a retaining ring groove is provided on the fifth cylindrical surface. The retaining ring is located in the retaining ring groove, and the retaining ring and the third stepped surface can achieve axial positioning of the bushing. The core-taking component includes a retaining ring seat and a core-taking cylinder that are threadedly connected to each other, and the retaining ring seat is in frictional contact with the bushing.

[0025] In this technical solution, the stabilizing component also includes a bushing and a snap ring bushing. The bushing is located in the receiving cavity formed by the fifth cylindrical surface, and the fifth cylindrical surface is provided with a snap ring groove. The snap ring and the third stepped surface realize the axial limitation of the bushing. The core-retrieving component includes a snap ring seat and a core-retrieving cylinder that are threaded together. When the core-retrieving cylinder is disassembled, the snap ring seat can be removed at the same time for easy inspection.

[0026] The fifth cylindrical surface is interference-fitted with the bushing, which enables torque transmission between the stabilizer ring and the bushing.

[0027] In one technical solution of the present invention, the first position is set as a bushing and the second position is set as a snap ring seat.

[0028] In this technical solution, the first position is set as a bushing and the second position is set as a snap ring seat. The two are in frictional contact to support the core extraction component within the stabilizing component, while also meeting the flow requirements of the flushing fluid.

[0029] In one embodiment of the present invention, the bushing can be made of tungsten carbide.

[0030] In this technical solution, the bushing is made of tungsten carbide. Compared with other metal materials, it can ensure a relatively small coefficient of friction with the flushing fluid, and has advantages such as high hardness, good wear resistance, and long service life, thus serving as the basic material for the bushing.

[0031] In one technical solution of the present invention, the second coupling and the fourth cylindrical surface are configured to be one of key drive, pin drive and polygon drive.

[0032] In this technical solution, the second coupling and the fourth cylindrical surface are configured with one of key drive, pin drive, and polygonal drive. Specifically, it can be configured as key drive, with a drive key provided on the fourth cylindrical surface and a keyway provided on the second coupling to cooperate with the drive key.

[0033] In one technical solution of the present invention, a first disassembly hole is provided on the second cylindrical surface, and a second disassembly hole is provided on the drill bit.

[0034] In this technical solution, both the first disassembly hole and the second disassembly hole can be set as blind holes. When disassembling the stabilizing ring and the drill bit, the tool can be placed in the corresponding first disassembly hole and the second disassembly hole to facilitate the rotation and pulling of the drill bit and the stabilizing ring, thereby realizing the disassembly and assembly of the two.

[0035] Specifically, when disassembling the stabilizing component, first remove the drill bit, then disconnect the connecting threads between the first and second couplings, and finally disassemble the stabilizing component by striking its right end face.

[0036] Alternatively, the drill bit can be removed first, and the connecting threads between the reamer and the first coupling can be removed first. Then, the stabilizing component can be removed through the blind hole on the outer surface of the stabilizing ring.

[0037] In one technical solution of the present invention, a disassembly groove is provided on the end face of the bushing, and a groove is provided on the inner sidewall of the bushing.

[0038] In this technical solution, a disassembly groove is provided on the end face of the bushing, which can be set as a semi-circular groove. This groove is the force-bearing position of the bushing when disassembling it. The groove is used to allow the flushing fluid to pass through the bushing and also to improve the flow efficiency of the flushing fluid in the bushing. The inner surface of the bushing is chamfered to allow the core extraction assembly to pass through smoothly.

[0039] Beneficial effects

[0040] The beneficial effects of the present invention are as follows: The core drilling device of the present invention includes a drilling component, a stabilizing component, and a core sampling component, which are nested together. The drilling component is on the outermost side, the core sampling component is on the innermost side, and the stabilizing component is disposed between the inner wall of the drilling component and the core sampling component, which plays a supporting role for the core sampling component and can maintain the stability of the core sampling component during the drilling process of the core drilling device.

[0041] There is a flow channel between the stabilizing component and the core drilling component. During the drilling process, the medium fluid, such as a relatively clear flushing fluid, is input into the core drilling device through this flow channel and is finally output through the drilling end of the drilling component. The flushing fluid can flush the bottom of the hole, reduce the temperature, and mix some impurities into the flushing fluid. The impurities mixed with the flushing fluid eventually flow out of the hole from the gap between the hole wall and the outer wall of the drilling component. After treatment, they can rejoin the circulation of the input flow channel.

[0042] The first and second positions are the actual supporting positions between the coring assembly and the stabilizing assembly. The second position is designated as a wear part relative to the first position. When the coring drill bit performs the drilling action, the stabilizing assembly moves with the drilling assembly, while the coring assembly does not move. Therefore, friction occurs between the first and second positions, causing wear to both. However, since the first position is more wear-resistant than the second position, the wear on the second position is greater during the drilling action, while the wear on the first position is almost negligible. When performing the core retrieval action, the coring assembly along with the core can be removed from the drilling assembly and the stabilizing assembly using a wireline coring method. Therefore, the wear condition of the second position can be measured each time the core is retrieved, and the second position can be replaced. Compared with the conventional method of replacing the stabilizing component by lifting the entire drill bit in a coring tool, the replacement time is significantly shortened, which helps to improve drilling efficiency. Attached Figure Description

[0043] Figure 1 This is one of the structural schematic diagrams of the coring drill bit device of the present invention;

[0044] Figure 2 This is a second schematic diagram of the core drilling device of the present invention;

[0045] Figure 3 For the present invention Figure 2 A schematic diagram of the cross-sectional structure of the X-plane;

[0046] Figure 4 This is a schematic diagram of the stabilizing ring of the present invention;

[0047] Figure 5 This is a schematic diagram of the bushing structure of the present invention.

[0048] [Explanation of Labels in the Attached Image]

[0049] 1: Drilling assembly;

[0050] 11: Drill bit; A: First cylindrical surface; B: First conical surface; C: First stepped surface; D: Second conical surface; Q: Second disassembly hole;

[0051] 12: Hole expander;

[0052] 13: First coupling;

[0053] 14: Second coupling;

[0054] 15: Flange;

[0055] 2: Stable components;

[0056] 21: Stabilizing ring; E: Second cylindrical surface; F: Second stepped surface; G: Third cylindrical surface; H: Fourth cylindrical surface; I: Sealing groove; J: Fifth cylindrical surface; K: Third stepped surface; L: Sixth cylindrical surface; M: Snap ring groove; N: First disassembly hole; O: Disassembly groove; P: Groove;

[0057] 22: Bushing;

[0058] 23: Snap ring;

[0059] 3: Core extraction assembly;

[0060] 31: Snap ring holder;

[0061] 32: Core sampler;

[0062] 4: Sealing components. Detailed Implementation

[0063] To better explain and facilitate understanding of this invention, the following description is provided in conjunction with the appendix. Figure 1-5 The present invention will be described in detail through specific embodiments. In this document, directional terms such as "upper," "lower," etc., are used interchangeably. Figure 1 The orientation is used as a reference.

[0064] Example 1:

[0065] Reference Figure 1 and Figure 2The present invention provides a core drilling device, including a drilling assembly 1, a stabilizing assembly 2, and a core drilling assembly 3. The core drilling assembly 3 is disposed inside the inner tube formed by the drilling assembly 1, and the stabilizing assembly 2 is disposed between the outer wall of the core drilling assembly 3 and the inner wall of the drilling assembly 1. Torque can be transmitted between the drilling assembly 1 and the stabilizing assembly 2. The core drilling assembly 3 can be extracted from the stabilizing assembly 2. A flow channel for the medium liquid to pass through is also formed between the stabilizing assembly 2 and the core drilling assembly 3. The medium liquid can run from one end of the drilling assembly 1 to the other end of the drilling assembly 1 and be output. The first position of the stabilizing assembly 2 is in frictional contact with the second position of the core drilling assembly 3. The first position is made of a wear-resistant material, and the second position is made of a consumable material. While the stabilizing assembly 2 rotates with the drilling assembly 1, the core drilling assembly 3 does not rotate.

[0066] In this embodiment, the core drilling device includes a drilling component 1, a stabilizing component 2, and a core sampling component 3, which are nested together. The drilling component 1 is on the outermost side, the core sampling component 3 is on the innermost side, and the stabilizing component 2 is disposed between the inner wall of the drilling component 1 and the core sampling component 3, which provides support for the core sampling component 3 and keeps the core sampling component 3 stable during the drilling process of the core drilling device.

[0067] There is a flow channel between the stabilizing component 2 and the core sampling component 3. During the drilling process, the medium liquid, such as a relatively clear flushing liquid, is input into the core sampling drill bit device through the flow channel and is finally output through the drilling end of the drilling component 1. The flushing liquid can flush the bottom of the hole, reduce the temperature, and mix some impurities into the flushing liquid. The impurities mixed with the flushing liquid eventually flow out of the hole from the gap between the hole wall and the outer wall of the drilling component 1. After treatment, they can rejoin the circulation of the input flow channel.

[0068] The first and second positions are the actual supporting positions between the core sampling assembly 3 and the stabilizing assembly 2. The second position is designated as a wear part relative to the first position. When the core sampling drill bit performs the drilling action, the stabilizing assembly 2 moves with the drilling assembly 1, while the core sampling assembly 3 does not move. Therefore, friction will occur between the first and second positions, causing wear to both. However, since the first position is more wear-resistant than the second position, the wear of the second position will be greater when the core sampling drill bit performs the drilling action, while the wear of the first position is almost negligible. When performing the core sampling action, the core sampling assembly 3 along with the core can be removed from the drilling assembly 1 and the stabilizing assembly 2 using a wireline core sampling method. Therefore, the wear condition of the second position can be measured each time the core is retrieved, and the second position can be replaced. Compared with the conventional core sampling tool where the stabilizing assembly 21 is replaced by lifting the entire drill bit, the replacement time is greatly shortened, which is beneficial to improving drilling efficiency.

[0069] Reference Figure 2 In this embodiment, the drilling assembly 1 includes a drill bit 11, a reamer 12, a first coupling 13, and a second coupling 14 that are sequentially threaded along the axis. At least the drill bit 11 and the reamer 12 are sealed at the radially outer position corresponding to the drilling assembly 1 by a sealing angle. The core drilling device also includes a sealing assembly 4, which is located on both sides of the threaded engagement position between the drill bit 11 and the reamer 12, and corresponds to the radially inner position of the drilling assembly 1.

[0070] In this embodiment, the drilling assembly 1 includes a drill bit 11, a reamer 12, a first coupling 13, and a second coupling 14 connected in sequence along the axis. The drill bit 11 performs a tunneling action when it is running, and the reamer 12 expands the hole after the drill bit 11 has finished tunneling. The first coupling 13 and the second coupling 14 play the role of transmitting torque, which is used to transmit the torque from the surface to the drill bit 11 downhole.

[0071] Specifically, the drill bit 11 can be configured as a diamond-encrusted core drill bit 11 with a wide horseshoe-shaped lip. Its nozzle distribution is conducive to achieving slag removal inside the hole. The outer surface of the drill bit 11 has external threads for connection with the internal threads of the reamer 12. The threads have a 75° sealing angle to prevent the flushing fluid on the outer surface from entering the inside of the threads.

[0072] Reference Figure 2 Meanwhile, the core drilling device also includes a sealing component 4. The sealing angle is used to prevent external flushing fluid from flowing into the threaded part between the drill bit 11 and the reamer 12. The sealing component 4 is used to prevent internal flushing fluid from flowing into the threaded part between the drill bit 11 and the reamer 12. Under the combined action of internal and external sealing, rock cuttings in the flushing fluid can be effectively prevented from entering the connecting threads of the drill bit 11, reducing the difficulty of disassembling the drill bit 11 and the degree of thread damage, thereby improving the reliability of the entire drilling operation and increasing work efficiency.

[0073] More specifically, a 75° sealing angle can be set between the reamer 12 and the first coupling 13, and between the first coupling 13 and the second coupling 14. The reamer 12 is threaded with the first coupling 13 through an internal thread, and the first coupling 13 is also threaded with the second coupling 14 through an internal thread.

[0074] Reference Figure 2In this embodiment, the inner surface of the drill bit 11 has a first cylindrical surface A, a first conical surface B, a first stepped surface C, and a second conical surface D that are interconnected. The taper of the first conical surface B is greater than the taper of the second conical surface D. The stabilizing component 2 includes a stabilizing ring 21. The outer surface of the stabilizing ring 21 has a second cylindrical surface E, a second stepped surface F, a third cylindrical surface G, and a fourth cylindrical surface H that are interconnected. The diameter of the second cylindrical surface E is greater than the diameter of the third cylindrical surface G, and the diameter of the third cylindrical surface G is greater than the diameter of the fourth cylindrical surface H. The second cylindrical surface E is clearance-fitted with the second conical surface D, the third cylindrical surface G is clearance-fitted with the inner wall of the first coupling 13, and the fourth cylindrical surface H can transmit torque with the second coupling 14. The axial position of the stabilizing ring 21 is defined by the first stepped surface C and the flange 15 of the second coupling 14.

[0075] In this embodiment, the inner surface of the drill bit 11 has a first cylindrical surface A, a first conical surface B, a first stepped surface C, and a second conical surface D that are connected to each other. Flow grooves are formed on the first cylindrical surface A and the first conical surface B to allow flushing fluid to pass through. The first conical surface B and the second conical surface D are separated by the first stepped surface C, and the taper of the first conical surface B is greater than that of the second conical surface D. The larger taper of the first conical surface B is designed to facilitate better convergence of the flushing fluid into the flow grooves. The larger taper of the first conical surface B also helps the flushing fluid to obtain a higher output pressure, thereby fully achieving the flushing of the bottom of the hole.

[0076] Setting the second conical surface D to a smaller taper allows for better fit with the stabilizing ring 21, preventing large gaps between them and thus improving the stability of the stabilizing ring 21 within the drill bit 11. At the same time, when disassembling the drill bit 11, the drill bit 11 will not rub against the stabilizing ring 21, reducing the difficulty of disassembling the drill bit 11.

[0077] The outer surface of the stabilizing ring 21 has a second cylindrical surface E, a second stepped surface F, a third cylindrical surface G, and a fourth cylindrical surface H that are connected to each other. The second cylindrical surface E can be clearance-fitted with the second conical surface D, and the third cylindrical surface G can be clearance-fitted with the inner wall of the first coupling 13, thereby realizing torque transmission between the first coupling 13 and the third cylindrical surface G. This allows the stabilizing ring 21 to rotate together with the perforated assembly 1. The axial position of the stabilizing ring 21 can be defined by the flange 15 of the second coupling 14 on the first stepped surface C.

[0078] Specifically, the stabilizing ring 21 can be made of copper to improve the ease of processing the stabilizing ring 21.

[0079] Reference Figure 2 In this embodiment, a sealing groove I is provided on the third cylindrical surface G, and the sealing component 4 includes at least a first sealing ring and a second sealing ring. The first sealing ring is located between the stabilizing ring 21 and the first stepped surface C, and the second sealing ring is located in the sealing groove I.

[0080] In this embodiment, a sealing groove I is provided on the third cylindrical surface G. The sealing groove I is a circumferential groove. The first sealing ring is located at the first stepped surface C, which plays a sealing role between the first stepped surface C and the end face of the stabilizing ring 21. The second sealing ring is located at the sealing groove I, which plays a sealing role between the outer wall of the stabilizing ring 21 and the first coupling 13. In this way, both sides of the internal position of the mating thread of the drill bit 11 and the first coupling 13 are sealed. With the help of the sealing angle, rock debris in the flushing fluid can be effectively prevented from entering the connecting thread of the drill bit 11, reducing the difficulty of disassembling the drill bit 11 and the degree of thread damage, thereby improving the reliability of the entire drilling operation and improving work efficiency.

[0081] Reference Figure 2 In this embodiment, the stabilizing component 2 further includes a bushing 22 and a retaining ring 23. The inner surface of the stabilizing ring 21 has a fifth cylindrical surface J, a third stepped surface K, and a sixth cylindrical surface L that are connected to each other. The diameter of the fifth cylindrical surface J is larger than the diameter of the sixth cylindrical surface L. The fifth cylindrical surface J is interference-fitted with the bushing 22. A retaining ring groove M is provided on the fifth cylindrical surface J. The retaining ring 23 is provided in the retaining ring groove M. The retaining ring 23 and the third stepped surface K can realize the axial positioning of the bushing 22. The core-taking component 3 includes a retaining ring seat 31 and a core-taking cylinder 32 that are threadedly connected to each other. The retaining ring seat 31 is in frictional contact with the bushing 22.

[0082] In this embodiment, the stabilizing component 2 also includes a bushing 22 and a retaining ring 23. The bushing 22 is disposed in the receiving cavity formed by the fifth cylindrical surface J, and the fifth cylindrical surface J is provided with a retaining ring groove M. The retaining ring 23 and the third stepped surface K realize the axial positioning of the bushing 22. The core-taking component 3 includes a retaining ring seat 31 and a core-taking cylinder 32 that are threadedly connected to each other. When the core-taking cylinder 32 is disassembled, the retaining ring seat 31 can be removed at the same time for easy inspection.

[0083] The fifth cylindrical surface J is interference-fitted with the bushing 22, which enables torque transmission between the stabilizing ring 21 and the bushing 22.

[0084] Reference Figure 3 In this embodiment, the second coupling 14 and the fourth cylindrical surface H are configured to use one of key drive, pin drive and polygon drive.

[0085] In this embodiment, the second coupling 14 and the fourth cylindrical surface H are configured to be driven by a key, a pin, or a polygonal drive. Specifically, it can be configured as a key drive, in which a drive key can be provided on the fourth cylindrical surface H and a keyway that mates with the drive key can be provided on the second coupling 14.

[0086] The first position is set as bushing 22, and the second position is set as snap ring seat 31.

[0087] In this embodiment, the first position is set as bushing 22 and the second position is set as snap ring seat 31. The two are in frictional contact to support the core extraction component 3 in the stabilizing component 2, while also meeting the flow requirements of the flushing fluid.

[0088] In this embodiment, the bushing 22 can be made of tungsten carbide.

[0089] In this embodiment, the bushing 22 is made of tungsten carbide. Compared with other metal materials, it can ensure a relatively small coefficient of friction with the rinsing fluid, and has advantages such as high hardness, good wear resistance, and long service life, thus serving as the basic material for the bushing 22.

[0090] Example 2:

[0091] Reference Figure 1 and Figure 4 In addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0092] The second cylindrical surface E has a first disassembly hole N, and the drill bit 11 has a second disassembly hole Q.

[0093] In this embodiment, both the first disassembly hole N and the second disassembly hole Q can be set as blind holes. When disassembling the stabilizing ring 21 and the drill bit 11, the tool can be placed in the corresponding first disassembly hole N and second disassembly hole Q to facilitate rotating and pulling the drill bit 11 and the stabilizing ring 21, thereby realizing the disassembly and assembly of the two.

[0094] Specifically, when disassembling the stabilizing component 2, the drill bit 11 can be removed first, and then the connecting threads of the first coupling 13 and the second coupling 14 can be removed. The stabilizing component 2 can be disassembled by striking the right end face of the stabilizing component 2.

[0095] Alternatively, the drill bit 11 can be removed first, the connecting threads between the reamer 12 and the first coupling 13 can be removed first, and then the stabilizing component 2 can be removed through the blind hole on the outer surface of the stabilizing ring 21.

[0096] Example 3:

[0097] Reference Figure 5 In addition to possessing all the technical solutions of any of the above embodiments, the embodiments of the present invention further possess the following technical solutions:

[0098] In this embodiment, a disassembly groove O is provided on the end face of the bushing 22, and a groove P is provided on the inner sidewall of the bushing 22.

[0099] In this embodiment, a disassembly groove O is provided on the end face of the bushing 22, which can be set as a semi-circular groove. This is the position where the bushing 22 is subjected to force when disassembling the bushing 22. The groove P is used to allow the flushing fluid to pass through the bushing 22, and at the same time, it can also improve the flow efficiency of the flushing fluid in the bushing 22. The inner surface of the bushing 22 is provided with a chamfer to allow the core extraction assembly 3 to pass through smoothly.

[0100] It can be understood that, except for conflicting parts, the above embodiments 1-3 can be freely combined to form other embodiments of the present invention.

[0101] In the description of this invention, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0102] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0103] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0104] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0105] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A core drilling bit device, characterized in that: The device includes a drilling assembly (1), a stabilizing assembly (2), and a core-retrieving assembly (3). The core-retrieving assembly (3) is disposed inside the inner tube formed by the drilling assembly (1). The stabilizing assembly (2) is disposed between the outer wall of the core-retrieving assembly (3) and the inner wall of the drilling assembly (1). The drilling assembly (1) and the stabilizing assembly (2) can transmit torque. The core-retrieving assembly (3) can be extracted from the stabilizing assembly (2). A flow channel is also formed between the stabilizing component (2) and the core-taking component (3) to allow the medium liquid to pass through, and the medium liquid can run from one end of the perforating component (1) to the other end of the perforating component (1) and be output. The first position of the stabilizing component (2) is in frictional contact with the second position of the core-taking component (3). The second position is made of a fragile material relative to the first position. While the stabilizing component (2) follows the drilling component (1) in operation, the core-taking component (3) does not rotate. The drilling assembly (1) includes a drill bit (11) and a reamer (12) that are threaded together along the axis. The inner surface of the drill bit (11) has a first cylindrical surface (A), a first conical surface (B), a first stepped surface (C), and a second conical surface (D) connected sequentially along the axis. The stabilizing component (2) includes a stabilizing ring (21) and a bushing (22); The outer surface of the stabilizing ring (21) has a second cylindrical surface (E), a second stepped surface (F), a third cylindrical surface (G) and a fourth cylindrical surface (H) connected sequentially along the axis. The core-taking assembly (3) includes a snap ring seat (31) and a core-taking cylinder (32) that are threaded together, and the snap ring seat (31) is in frictional contact with the bushing (22); The first position is set as the bushing (22), and the second position is set as the snap ring seat (31); When the core-taking cylinder (32) is disassembled, the snap ring seat (31) can be removed at the same time; The core drilling device also includes a sealing component (4), which is located on both sides of the threaded engagement position between the drill bit (11) and the reamer (12), and corresponds to the radial inner position of the drilling component (1). A sealing groove (I) is provided on the third cylindrical surface (G), and the sealing assembly (4) includes at least a first sealing ring and a second sealing ring. The first sealing ring is located between the stabilizing ring (21) and the first stepped surface (C), and the second sealing ring is located in the sealing groove (I).

2. The coring drill bit device as described in claim 1, characterized in that: The drilling assembly (1) includes a first coupling (13) and a second coupling (14) that are sequentially threaded along the axis to the tail end of the reamer (12). At least the drill bit (11) and the reamer (12) are sealed at the radially outer position of the drilling assembly by a sealing angle.

3. The coring drill bit device as described in claim 2, characterized in that: The taper of the first conical surface (B) is greater than the taper of the second conical surface (D); The diameter of the second cylinder (E) is larger than the diameter of the third cylinder (G), and the diameter of the third cylinder (G) is larger than the diameter of the fourth cylinder (H); The second cylindrical surface (E) is in clearance fit with the second conical surface (D), the third cylindrical surface (G) is in clearance fit with the inner wall of the first coupling (13), the fourth cylindrical surface (H) can transmit torque between itself and the second coupling (14), and the axial position of the stabilizing ring (21) is defined by the first stepped surface (C) and the flange (15) of the second coupling (14).

4. The coring drill bit device as described in claim 3, characterized in that: The stabilizing component (2) also includes a retaining ring (23), and the inner surface of the stabilizing ring (21) has a fifth cylindrical surface (J), a third stepped surface (K) and a sixth cylindrical surface (L) that are connected to each other, and the diameter of the fifth cylindrical surface (J) is larger than the diameter of the sixth cylindrical surface (L); The fifth cylindrical surface (J) is interference-fitted with the bushing (22), and the fifth cylindrical surface (J) is provided with a retaining ring groove (M). The retaining ring (23) is located in the retaining ring groove (M). The retaining ring (23) and the third stepped surface (K) can realize the axial positioning of the bushing (22).

5. The coring drill bit device as described in claim 4, characterized in that: The bushing (22) can be made of tungsten carbide.

6. The coring drill bit device as described in claim 5, characterized in that: The second coupling (14) and the fourth cylindrical surface (H) are configured to be one of key drive, pin drive and polygon drive.

7. The coring drill bit device as described in claim 6, characterized in that: The second cylindrical surface (E) is provided with a first disassembly hole (N), and the drill bit (11) is provided with a second disassembly hole (Q).

8. The coring drill bit device as described in claim 7, characterized in that: The bushing (22) has a disassembly groove (O) on its end face and a groove (P) on its inner sidewall.

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