Drill pipe structure and drilling apparatus

Abstract

The present application relates to a kind of drill pipe structure and drilling device, it is related to oil drilling technical field.The drill pipe structure of the present application includes multiple drill pipes, casing column, first fixed part and second fixed part, multiple drill pipes are coaxially arranged;Casing column is arranged at one end of drill pipe;First fixed part is arranged at the end of drill pipe away from casing column;Second fixed part is arranged in casing column;Wherein, in locked state, second fixed part can move to the direction of the first fixed part of adjacent drill pipe, to make second fixed part and the first fixed part of adjacent drill pipe be connected;In release state, second fixed part can move to the direction of the first fixed part of adjacent drill pipe, to make second fixed part and the first fixed part of adjacent drill pipe be separated.The technical scheme disclosed in the present application can solve the problem that the thread connection between the existing drill pipes is used, the thread connection between the two drill pipes connected by drill pipe rotation becomes more and more tight, leading to the problem that drill pipe is difficult to disassemble.

Description

Technical Field

[0001] This invention relates to the field of oil drilling technology, and particularly to a drill pipe structure and drilling apparatus. Background Technology

[0002] Oil drilling is a systematic engineering process that uses oil drilling equipment to drill through multiple formations along a designed trajectory from the surface to the predetermined target layer (oil and gas layer or potential oil and gas layer), forming a stable channel (i.e., oil and gas well) for the extraction or injection of the required fluids (water, gas, steam) for oil and gas production. During and after drilling, core sampling, logging, well logging and testing are completed to obtain various information required for exploration, development and drilling.

[0003] Drill pipe is an indispensable tool in oil drilling. During deep well drilling operations, multiple drill pipes need to be connected to extend their length. Currently, drill pipes are typically connected via threaded connections. However, during drilling operations, the rotation of the drill pipe tightens the threaded connection between connected drill pipes, making disassembly difficult. Summary of the Invention

[0004] This invention provides a drill pipe structure and drilling device that can solve the problem that existing drill pipes use threaded connections, and the rotation of the drill pipe makes the threaded connection between two connected drill pipes increasingly tight, making it difficult to disassemble the drill pipes.

[0005] In a first aspect, embodiments of the present invention provide a drill pipe structure, comprising:

[0006] Multiple drill pipes, all of which are coaxially arranged;

[0007] A casing string is disposed at one end of the drill pipe;

[0008] A first fixing part is disposed at the end of the drill pipe away from the casing string; and

[0009] The second fixing part is disposed inside the sleeve column;

[0010] In the locked state, the second fixing part can move toward the first fixing part of the adjacent drill rod so that the second fixing part is connected to the first fixing part of the adjacent drill rod; in the released state, the second fixing part can move away from the first fixing part of the adjacent drill rod so that the second fixing part is separated from the first fixing part of the adjacent drill rod.

[0011] In one embodiment, the first fixing part includes an annular groove, which is disposed at one end of the drill pipe away from the casing string;

[0012] The second fixing part includes a plurality of clamping rods rotatably disposed on the inner wall of the casing column, and the plurality of clamping rods are arranged at equal intervals around the circumference of the casing column;

[0013] In the locked state, the plurality of clamping rods can move radially toward the annular groove of the adjacent drill rod, so that the clamping rods abut against the annular groove of the adjacent drill rod; in the released state, the plurality of clamping rods can move radially away from the annular groove of the adjacent drill rod, so that the clamping rods separate from the annular groove of the adjacent drill rod.

[0014] In one embodiment, the second fixing part further includes:

[0015] A push ring is disposed inside the sleeve column;

[0016] Multiple radial elastic elements correspond one-to-one with multiple locking rods. One end of each radial elastic element is connected to the end of the corresponding locking rod away from the push ring, and the other end of each radial elastic element is connected to the inner wall of the push ring; and

[0017] A radial drive assembly is disposed between the push ring and the sleeve post. The radial drive assembly can drive the push ring to move in the axial direction so as to rotate the clamp rod.

[0018] In one embodiment, the radial drive assembly includes:

[0019] Multiple fixing blocks are disposed on the outer wall of the push ring, and the multiple fixing blocks are arranged circumferentially around the push ring at intervals.

[0020] Multiple sleeves, each corresponding one-to-one with one of the aforementioned fixing blocks, with one end of each sleeve connected to the corresponding fixing block; and

[0021] Multiple radial drive rods are respectively associated with multiple sleeves. The radial drive rods are rotatably inserted through the bottom of the sleeve column, and one end of the radial drive rod is threadedly connected to the corresponding sleeve.

[0022] In one embodiment, the first fixing part further includes a limiting groove, the limiting groove being disposed at one end of the drill rod away from the casing string; the second fixing part further includes a pressure plate and a limiting block disposed at the bottom of the pressure plate;

[0023] In the locked state, the pressure plate can move axially toward the limiting groove of the adjacent drill rod, so that the limiting block is inserted into the limiting groove of the adjacent drill rod; in the released state, the pressure plate can move axially away from the limiting groove of the adjacent drill rod, so that the limiting block leaves the limiting groove of the adjacent drill rod.

[0024] In one embodiment, the second fixing part further includes:

[0025] A retaining ring is disposed on the inner wall of the sleeve column and located between the push ring and the pressure plate;

[0026] A ladder platform is disposed on top of the pressure plate, and the ladder platform has multiple first driving surfaces;

[0027] Multiple push blocks are arranged circumferentially around the ladder platform and correspond one-to-one with multiple first driving surfaces. The push blocks are movably disposed inside the sleeve column, and each push block has a second driving surface adapted to the corresponding first driving surface.

[0028] An axial drive assembly, disposed on the sleeve post, is capable of driving the pusher block to move along the radial direction, thereby causing the pressure plate to move along the axial direction; and

[0029] Multiple axial elastic elements are connected at both ends to the pressure plate and the fixing ring, respectively, and the multiple axial elastic elements are arranged circumferentially around the fixing ring.

[0030] In one embodiment, the axial drive assembly includes:

[0031] Multiple axial drive rods are rotatably connected to the sleeve column, and each of the multiple axial drive rods corresponds to a multiple of the push blocks. The axial drive rods are threadedly connected to the corresponding push blocks.

[0032] In one embodiment, the drill pipe structure further includes a slip assembly, the slip assembly comprising:

[0033] A housing with a through hole extending through it in the axial direction for the drill rod to pass through;

[0034] A slip portion is provided inside the housing, and the slip portion is used to clamp the drill rod that passes through the housing.

[0035] In one embodiment, the slip portion includes:

[0036] Starting chock;

[0037] The termination slip seat is arranged opposite to the starting slip seat;

[0038] The slip chain includes multiple intermediate slip seats, which are sequentially hinged to form a loop, and the two ends of the slip chain are respectively hinged to the starting slip seat and the ending slip seat;

[0039] The slip bodies are respectively disposed on the intermediate slip seat, the starting slip seat and the ending slip seat;

[0040] The locking block is rotatably mounted on the starting locking seat;

[0041] An adjusting rod, passing through the termination slip seat and with one end connected to the starting slip seat; and

[0042] The locking sleeve is threadedly connected to the adjusting rod and is located at the end of the terminating slip seat away from the starting slip seat.

[0043] Secondly, embodiments of the present invention provide a drilling apparatus, including the drill pipe structure as described above.

[0044] Compared with the prior art, the advantages of the embodiments of the present invention are that by setting a first fixing part and a second fixing part at both ends of the drill rod, the assembly and disassembly of two adjacent drill rods can be realized by the cooperation of the first fixing part and the second fixing part. In the loosened state, the second fixing part moves away from the first fixing part of the adjacent drill rod, so that the connection between the two adjacent drill rods can be quickly disconnected, making assembly and disassembly convenient. This solves the problem that the existing drill rods use threaded connections, and the rotation of the drill rod makes the threaded connection between the two connected drill rods tighter, making it difficult to disassemble the drill rods. Attached Figure Description

[0045] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0046] Figure 1 This is a schematic diagram of a drill pipe structure provided in an embodiment of the present invention;

[0047] Figure 2 yes Figure 1 A schematic diagram of the structure of the first fixing part provided in the embodiment;

[0048] Figure 3 yes Figure 1 A schematic diagram of the structure of the first fixing part and the second fixing part in the locked state provided in the embodiment;

[0049] Figure 4 yes Figure 1 A schematic diagram of the structure of the second fixing part provided in the embodiment;

[0050] Figure 5 yes Figure 1 A schematic diagram of the structure of the second fixing part provided in the Chinese embodiment from another perspective;

[0051] Figure 6 yes Figure 1 A schematic diagram of the slip section provided in the Chinese embodiment;

[0052] Figure 7 yes Figure 1 A schematic diagram of the slip portion provided in the Chinese embodiment from another perspective.

[0053] Figure label:

[0054] 10. Drill pipe;

[0055] 20. Casing string;

[0056] 30. First fixing part; 310. Annular groove; 320. Limiting groove;

[0057] 40. Second fixing part; 410. Locking rod; 420. Push ring; 430. Radial elastic element; 440. Radial drive assembly; 4401. Fixing block; 4402. Sleeve; 4403. Radial drive rod; 450. Pressure plate; 4501. Limiting block; 460. Fixing ring; 470. Ladder platform; 480. Push block; 490. Axial drive assembly; 4901. Axial drive rod; 491. Elastic element;

[0058] 50. Locking jaw assembly; 510. Housing; 520. Locking jaw part; 5201. Starting locking jaw seat; 5202. Ending locking jaw seat; 5203. Locking jaw chain; 5204. Locking jaw body; 5205. Locking jaw fixing block; 5206. Adjusting rod; 5207. Locking sleeve; 5208. Intermediate locking jaw seat. Detailed Implementation

[0059] The invention will now be further described with reference to the accompanying drawings.

[0060] Oil drilling is a systematic engineering process that uses oil drilling equipment to drill through multiple formations along a designed trajectory from the surface to the predetermined target layer (oil and gas layer or potential oil and gas layer), forming a stable channel (i.e., oil and gas well) for the extraction or injection of the required fluids (water, gas, steam) for oil and gas production. During and after drilling, core sampling, logging, well logging and testing are completed to obtain various information required for exploration, development and drilling.

[0061] Drill pipe is an indispensable tool in oil drilling. It is a steel pipe with threads at the end, used to connect the drilling rig's surface equipment to the drilling equipment located at the bottom of the well. Its function is to transport drilling mud to the drill bit and raise, lower, or rotate it together with the drill bit. Therefore, drill pipe must be able to withstand enormous internal and external pressure, torsion, bending, and vibration.

[0062] When drilling deep wells, multiple drill pipes need to be connected to extend their length. Current technology typically uses threaded connections to link the drill pipes. However, during drilling, the rotation of the drill pipes tightens the threaded connection between connected pipes, making disassembly difficult.

[0063] Example 1

[0064] like Figures 1-5 As shown, to solve the above-mentioned technical problems, this embodiment of the invention provides a drill pipe 10 structure, including multiple drill pipes 10, a casing column 20, a first fixing part 30, and a second fixing part 40; the multiple drill pipes 10 are coaxially arranged; the casing column 20 is disposed at one end of the drill pipe 10; the first fixing part 30 is disposed at the end of the drill pipe 10 away from the casing column 20; the second fixing part 40 is disposed inside the casing column 20; wherein, in the locked state, the second fixing part 40 can move towards the first fixing part 30 of the adjacent drill pipe 10, so that the second fixing part 40 is connected to the first fixing part 30 of the adjacent drill pipe 10; in the released state, the second fixing part 40 can move away from the first fixing part 30 of the adjacent drill pipe 10, so that the second fixing part 40 is separated from the first fixing part 30 of the adjacent drill pipe 10.

[0065] As can be seen from the above, by setting a first fixing part 30 and a second fixing part 40 at both ends of the drill rod 10 respectively, the first fixing part 30 and the second fixing part 40 cooperate with each other to realize the disassembly and assembly between two adjacent drill rods 10. When the drill rod is loosened, the second fixing part 40 moves away from the first fixing part 30 of the adjacent drill rod 10, so that the two adjacent drill rods 10 can be quickly disconnected. The disassembly and assembly are convenient, which solves the problem that the existing drill rods 10 use threaded connections, and the rotation of the drill rod 10 makes the threaded connection between the two connected drill rods 10 tighter, making it difficult to disassemble the drill rods 10.

[0066] It should be noted that the casing string 20 and the drill pipe 10 are connected by means of welding or integral molding, including but not limited to welding.

[0067] Example 2

[0068] like Figures 1-5 As shown, the drill pipe 10 structure includes multiple drill pipes 10, a casing string 20, a first fixing part 30, and a second fixing part 40; the multiple drill pipes 10 are coaxially arranged; the casing string 20 is disposed at one end of the drill pipe 10; the first fixing part 30 is disposed at the end of the drill pipe 10 away from the casing string 20; the second fixing part 40 is disposed inside the casing string 20; wherein, in the locked state, the second fixing part 40 can move towards the first fixing part 30 of the adjacent drill pipe 10, so that the second fixing part 40 is connected to the first fixing part 30 of the adjacent drill pipe 10; in the released state, the second fixing part 40 can move away from the first fixing part 30 of the adjacent drill pipe 10, so that the second fixing part 40 is separated from the first fixing part 30 of the adjacent drill pipe 10.

[0069] As can be seen from the above, by setting a first fixing part 30 and a second fixing part 40 at both ends of the drill rod 10 respectively, the first fixing part 30 and the second fixing part 40 cooperate with each other to realize the disassembly and assembly between two adjacent drill rods 10. When the drill rod is loosened, the second fixing part 40 moves away from the first fixing part 30 of the adjacent drill rod 10, so that the two adjacent drill rods 10 can be quickly disconnected. The disassembly and assembly are convenient, which solves the problem that the existing drill rods 10 use threaded connections, and the rotation of the drill rod 10 makes the threaded connection between the two connected drill rods 10 tighter, making it difficult to disassemble the drill rods 10.

[0070] It should be noted that the casing string 20 and the drill pipe 10 are connected by means of welding or integral molding, including but not limited to welding.

[0071] like Figure 2 , Figure 3 As shown, in some embodiments, the first fixing part 30 includes an annular groove 310, which is disposed at one end of the drill pipe 10 away from the casing string 20; the second fixing part 40 includes a plurality of locking rods 410 rotatably disposed on the inner wall of the casing string 20, which are arranged at equal intervals around the casing string 20 in a circumferential direction; wherein, in the locked state, the plurality of locking rods 410 can move radially toward the annular groove 310 of the adjacent drill pipe 10 so that the locking rods 410 abut against the annular groove 310 of the adjacent drill pipe 10; in the released state, the plurality of locking rods 410 can move radially away from the annular groove 310 of the adjacent drill pipe 10 so that the locking rods 410 are separated from the annular groove 310 of the adjacent drill pipe 10.

[0072] By setting multiple locking rods 410 that can move in the radial direction, the multiple locking rods 410 can clamp or release adjacent drill rods 10, thereby achieving locking or releasing between two adjacent drill rods 10.

[0073] It should be noted that the lever 410 can be arc-shaped or bent with a bend angle.

[0074] like Figures 3-5 As shown, in some embodiments, the second fixing part 40 further includes a push ring 420, a plurality of radial elastic elements 430, and a radial drive assembly 440; the push ring 420 is disposed inside the sleeve post 20; the plurality of radial elastic elements 430 correspond one-to-one with the plurality of locking rods 410, one end of the radial elastic element 430 is connected to the end of the corresponding locking rod 410 away from the push ring 420, and the other end of the radial elastic element 430 is connected to the inner wall of the push ring 420; the radial drive assembly 440 is disposed between the push ring 420 and the sleeve post 20, and the radial drive assembly 440 can drive the push ring 420 to move in the axial direction so that the locking rods 410 rotate.

[0075] By setting the push ring 420, not only can the drill pipe 10 be inserted, but it also provides a structural foundation for the installation of the chuck 410 and the radial drive assembly 440. The radial drive assembly 440 drives the push ring 420 to move axially, causing the clamping rod 410 to rotate, thereby moving the clamping rod 410 closer to or further away from the drill rod 10 passing through the push ring 420. When the radial drive assembly 440 drives the push ring 420 to move upward axially, the push ring 420 abuts against the clamping rod 410, and the push ring 420 drives the clamping rod 410 to rotate away from the drill rod 10 passing through the push ring 420. The radial elastic element 430 is compressed to generate elastic force, thereby causing the clamping rod 410 to release the drill rod 10. When the radial drive assembly 440 drives the push ring 420 to move downward axially, the push ring 420 does not abut against the clamping rod 410. Under the action of the radial elastic element 430, the clamping rod 410 rotates towards the drill rod 10 passing through the push ring 420, and the clamping rod 410 abuts against the drill rod 10 passing through the push ring 420, thereby clamping the drill rod 10.

[0076] It should be noted that the radial elastic element 430 can be a spring, and the radial elastic element 430 is always in a compressed state; in addition, the number of radial elastic elements 430 and locking rods 410 are set according to actual needs, and this application does not impose specific restrictions.

[0077] like Figures 3-5 As shown, in some embodiments, the radial drive assembly 440 includes a plurality of fixing blocks 4401, a plurality of sleeves 4402, and a plurality of radial drive rods 4403; the plurality of fixing blocks 4401 are disposed on the outer wall of the push ring 420, and the plurality of fixing blocks 4401 are arranged circumferentially around the push ring 420; the plurality of sleeves 4402 correspond one-to-one with the plurality of fixing blocks 4401, and one end of the sleeve 4402 is connected to the corresponding fixing block 4401; the plurality of radial drive rods 4403 correspond one-to-one with the plurality of sleeves 4402, the radial drive rods 4403 are rotatably inserted through the bottom of the sleeve column 20, and one end of the radial drive rods 4403 is threadedly connected to the corresponding sleeves 4402.

[0078] By rotating the radial drive rod 4403, and utilizing the threaded connection between the radial drive rod 4403 and the sleeve 4402, the sleeve 4402 can move in the axial direction, and the push ring 420 moves with the sleeve 4402. When the radial drive rod 4403 rotates, causing the sleeve 4402 to move downward in the axial direction, the push ring 420 moves downward with the sleeve 4402; when the radial drive rod 4403 rotates, causing the sleeve 4402 to move upward in the axial direction, the push ring 420 moves upward with the sleeve 4402.

[0079] It should be noted that the bottom of the sleeve column 20 is provided with multiple through slots, including a first slot section and a second slot section that are connected. The radial drive rod 4403 is rotatably inserted into the first slot section via a rolling bearing. The sleeve 4402 is movably disposed in the second slot section. In addition, the sleeve 4402 is adapted to the second slot section, and the inner wall of the second slot section is provided with a slider extending axially. The outer wall of the sleeve 4402 is provided with a groove that cooperates with the slider. The slider is inserted into the groove, thereby providing a structural basis for the axial movement of the sleeve 4402.

[0080] It should also be noted that the number of fixed blocks 4401 is set according to actual needs, for example, such as Figure 4 As shown, there are two fixed blocks 4401.

[0081] like Figure 2 As shown, in some embodiments, the first fixing part 30 further includes a limiting groove 320, which is disposed at the end of the drill rod 10 away from the casing string 20; the second fixing part 40 further includes a pressure plate 450 and a limiting block 4501 disposed at the bottom of the pressure plate 450; wherein, in the locked state, the pressure plate 450 can move in the axial direction toward the limiting groove 320 of the adjacent drill rod 10, so that the limiting block 4501 is inserted into the limiting groove 320 of the adjacent drill rod 10; in the released state, the pressure plate 450 can move in the axial direction away from the limiting groove 320 of the adjacent drill rod 10, so that the limiting block 4501 leaves the limiting groove 320 of the adjacent drill rod 10.

[0082] By setting a pressure plate 450 that can move in the axial direction, the limiting block 4501 can be inserted into or released from the limiting groove 320 of the adjacent drill rod 10, thereby achieving locking or unlocking between two adjacent drill rods 10. In addition, based on the structure of the annular groove 310 and the locking rod 410, a double locking function is provided, which improves the reliability of the connection between two adjacent drill rods 10 and ensures synchronous movement between two adjacent drill rods 10, so that the drill rod 10 structure can move up, down and rotate together.

[0083] It should be noted that the limiting groove 320 is a strip groove, and the limiting block 4501 is a strip block.

[0084] like Figures 3-5As shown, in some embodiments, the second fixing part 40 further includes a fixing ring 460, a ladder 470, a plurality of push blocks 480, an axial drive assembly 490, and a plurality of axial elastic elements 491; the fixing ring 460 is disposed on the inner wall of the sleeve column 20 and located between the push ring 420 and the pressure plate 450; the ladder 470 is disposed on the top of the pressure plate 450, and the ladder 470 has a plurality of first drive surfaces; the plurality of push blocks 480 are arranged circumferentially around the ladder 470 and are respectively associated with the plurality of first drive surfaces. Correspondingly, the push block 480 is movably disposed within the sleeve post 20, and the push block 480 has a second driving surface adapted to the corresponding first driving surface; the axial driving assembly 490 is disposed on the sleeve post 20, and the axial driving assembly 490 can drive the push block 480 to move in the radial direction so that the pressure plate 450 moves in the axial direction; the two ends of the plurality of axial elastic elements 491 are respectively connected to the pressure plate 450 and the fixing ring 460, and the plurality of axial elastic elements 491 are arranged circumferentially around the fixing ring 460.

[0085] When the axial drive assembly 490 drives the push block 480 to move radially toward the axis, the first drive surface and the second drive surface abut against each other. Since both the first drive surface and the second drive surface are inclined surfaces, the radial movement of the push block 480 is transmitted to the ladder 470, which is transformed into the downward movement of the ladder 470 in the axial direction. The pressure plate 450 moves downward with the ladder 470, and the axial elastic element 491 is compressed, thereby the limiting block 4501 is inserted into the limiting groove 320, and the drill rod 10 is moved downward. The top of the annular groove 310 abuts against the clamping rod 410, further improving the reliability of the connection between the clamping rod 410 and the drill rod 10 and preventing the drill rod 10 from shaking.

[0086] When the axial drive assembly 490 drives the push block 480 to move in the radial direction away from the axis, the first drive surface and the second drive surface no longer abut, the pressure plate 450 moves upward under the action of the axial elastic member 491, and the limiting block 4501 leaves the limiting groove 320.

[0087] It should be noted that the platform 470 is a regular square truncated pyramid with four first driving surfaces, which are located on the side of the platform 470 respectively; in addition, the first driving surfaces are parallel to the second driving surfaces.

[0088] It should also be noted that a sliding groove is provided inside the sleeve column 20, and a slider that cooperates with the sliding groove is provided on the top of the push block 480, so that the push block 480 can be movably installed inside the sleeve column 20, providing a structural basis for the movement of the push block 480 in the radial direction.

[0089] like Figures 3-5As shown, in some embodiments, the axial drive assembly 490 includes a plurality of axial drive rods 4901, which are rotatably connected to the sleeve post 20. The plurality of axial drive rods 4901 correspond one-to-one with a plurality of push blocks 480, and the axial drive rods 4901 are threadedly connected to the corresponding push blocks 480.

[0090] The rotation of the axial drive rod 4901 drives the push block 480 to move radially, which is simple and convenient.

[0091] like Figure 6 , Figure 7 As shown, in some embodiments, the drill rod 10 structure further includes a slip assembly 50, which includes a housing 510 and a slip portion 520. The housing 510 is provided with a through hole that extends through the housing 510 in the axial direction for the drill rod 10 to pass through. The slip portion 520 is disposed inside the housing 510 and is used to clamp the drill rod 10 that passes through the housing 510.

[0092] The drill pipe 10 is clamped by the slip assembly 50 so that it is easy to lift the drill pipe 10 during the disassembly, assembly, and connection of single drill pipes, thereby facilitating the disassembly and assembly of adjacent drill pipes 10 and improving convenience.

[0093] like Figure 6 , Figure 7 As shown, in some embodiments, the slip portion 520 includes a starting slip seat 5201, a ending slip seat 5202, a slip chain 5203, a slip body 5204, a slip fixing block 5205, an adjusting rod 5206, and a locking sleeve 5207; the ending slip seat 5202 is arranged opposite to the starting slip seat 5201; the slip chain 5203 includes a plurality of intermediate slip seats 5208, which are sequentially hinged to make the slip chain 5203 a ring, and the two ends of the slip chain 5203 are respectively connected to the starting slip seat 5201. The locking seat 5201 and the terminating locking seat 5202 are hinged together; the locking body 5204 is respectively disposed on the intermediate locking seat 5208, the starting locking seat 5201 and the terminating locking seat 5202; the locking block 5205 is rotatably disposed on the starting locking seat 5201; the adjusting rod 5206 passes through the terminating locking seat 5202 and one end is connected to the starting locking seat 5201; the locking sleeve 5207 is threadedly connected to the adjusting rod 5206 and is located at the end of the terminating locking seat 5202 away from the starting locking seat 5201.

[0094] When the drill rod 10 is fixed, it passes through the locking ring formed by the slip chain 5203, the starting slip seat 5201, and the ending slip seat 5202. When the locking sleeve 5207 is rotated, the locking sleeve 5207 drives the ending slip seat 5202 to move closer to the starting slip seat 5201. Multiple intermediate slip seats 5208 move accordingly, making the inner diameter of the locking ring smaller and smaller until the slip body 5204 presses against the drill rod 10. At this time, the slip part 520 fixes the drill rod 10, thereby stopping the rotation of the locking sleeve 5207.

[0095] When the drill rod 10 is released, the locking sleeve 5207 is rotated. The locking sleeve 5207 drives the termination slip seat 5202 to move away from the starting slip seat 5201. Multiple intermediate slip seats 5208 move accordingly, making the inner diameter of the locking ring larger and larger until the slip body 5204 leaves the drill rod 10, thereby stopping the rotation of the locking sleeve 5207.

[0096] It should be noted that the slip body 5204 is provided with anti-slip texture, which can increase the friction between the slip body 5204 and the drill pipe 10, improve the fixing effect of the drill pipe 10, and thus ensure the reliability of clamping the drill pipe 10.

[0097] In summary, when disassembling one of the drill rods 10 in the present invention, the adjacent drill rod 10 is fixed by the slip assembly 50, the radial drive rod 4403 of the drill rod 10 is rotated to make the clamping rod 410 leave the annular groove 310, the axial drive rod 4901 of the drill rod 10 is rotated, the pressure plate 450 moves upward, and the limiting block 4501 leaves the limiting groove 320, thereby disconnecting the drill rod 10 from the adjacent drill rod 10 and allowing it to be directly removed; this invention When connecting a single drill rod to the drill rod 10 structure, the uppermost drill rod 10 of the drill rod 10 structure is fixed by the slip assembly 50. The uppermost drill rod 10 is inserted into the casing column 20 of the drill rod to be connected. The radial drive rod 4403 of the drill rod to be connected is rotated so that the clamping rod 410 abuts against the annular groove 310. The axial drive rod 4901 of the drill rod to be connected is rotated, the pressure plate 450 moves downward, and the limiting block 4501 is inserted into the limiting groove 320, thereby completing the connection of a single drill rod.

[0098] Example 3

[0099] This invention also provides a drilling apparatus, including a drill pipe structure according to any embodiment of the invention, thereby possessing all the technical effects brought about by the technical solutions of the above embodiments.

[0100] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drill pipe structure, characterized in that, include: Multiple drill pipes, all of which are coaxially arranged; A casing string is disposed at one end of the drill pipe; A first fixing part is disposed at the end of the drill pipe away from the casing string; and The second fixing part is disposed inside the sleeve column; In the locked state, the second fixing part can move toward the first fixing part of the adjacent drill rod so that the second fixing part is connected to the first fixing part of the adjacent drill rod; in the released state, the second fixing part can move away from the first fixing part of the adjacent drill rod so that the second fixing part is separated from the first fixing part of the adjacent drill rod.

2. The drill pipe structure according to claim 1, characterized in that, The first fixing part includes an annular groove, which is disposed at the end of the drill pipe away from the casing string; The second fixing part includes a plurality of clamping rods rotatably disposed on the inner wall of the casing column, and the plurality of clamping rods are arranged at equal intervals around the circumference of the casing column; In the locked state, the plurality of clamping rods can move radially toward the annular groove of the adjacent drill rod, so that the clamping rods abut against the annular groove of the adjacent drill rod; in the released state, the plurality of clamping rods can move radially away from the annular groove of the adjacent drill rod, so that the clamping rods separate from the annular groove of the adjacent drill rod.

3. The drill pipe structure according to claim 2, characterized in that, The second fixing part also includes: A push ring is disposed inside the sleeve column; Multiple radial elastic elements correspond one-to-one with multiple locking rods. One end of each radial elastic element is connected to the end of the corresponding locking rod away from the push ring, and the other end of each radial elastic element is connected to the inner wall of the push ring; and A radial drive assembly is disposed between the push ring and the sleeve post. The radial drive assembly can drive the push ring to move in the axial direction so as to rotate the clamp rod.

4. The drill pipe structure according to claim 3, characterized in that, The radial drive component includes: Multiple fixing blocks are disposed on the outer wall of the push ring, and the multiple fixing blocks are arranged circumferentially around the push ring at intervals. Multiple sleeves, each corresponding one-to-one with one of the aforementioned fixing blocks, with one end of each sleeve connected to the corresponding fixing block; and Multiple radial drive rods are respectively associated with multiple sleeves. The radial drive rods are rotatably inserted through the bottom of the sleeve column, and one end of the radial drive rod is threadedly connected to the corresponding sleeve.

5. The drill pipe structure according to claim 3, characterized in that, The first fixing part further includes a limiting groove, which is disposed at one end of the drill rod away from the casing string; the second fixing part further includes a pressure plate and a limiting block disposed at the bottom of the pressure plate; In the locked state, the pressure plate can move axially toward the limiting groove of the adjacent drill rod, so that the limiting block is inserted into the limiting groove of the adjacent drill rod; in the released state, the pressure plate can move axially away from the limiting groove of the adjacent drill rod, so that the limiting block leaves the limiting groove of the adjacent drill rod.

6. The drill pipe structure according to claim 5, characterized in that, The second fixing part also includes: A retaining ring is disposed on the inner wall of the sleeve column and located between the push ring and the pressure plate; A ladder platform is disposed on top of the pressure plate, and the ladder platform has multiple first driving surfaces; Multiple push blocks are arranged circumferentially around the ladder platform and correspond one-to-one with multiple first driving surfaces. The push blocks are movably disposed inside the sleeve column, and each push block has a second driving surface adapted to the corresponding first driving surface. An axial drive assembly, disposed on the sleeve post, is capable of driving the pusher block to move radially, thereby causing the pressure plate to move axially; and Multiple axial elastic elements are connected at both ends to the pressure plate and the fixing ring, respectively, and the multiple axial elastic elements are arranged circumferentially around the fixing ring.

7. The drill pipe structure according to claim 6, characterized in that, The axial drive assembly includes: Multiple axial drive rods are rotatably connected to the sleeve column, and each of the multiple axial drive rods corresponds to a multiple of the push blocks. The axial drive rods are threadedly connected to the corresponding push blocks.

8. The drill pipe structure according to claim 1, characterized in that, The drill pipe structure also includes a slip assembly, which comprises: The housing has a through hole that extends through the housing in the axial direction to allow the drill rod to pass through. A slip portion is provided inside the housing, and the slip portion is used to clamp the drill rod that passes through the housing.

9. The drill pipe structure according to claim 8, characterized in that, The slip portion includes: Starting chock; The termination slip seat is arranged opposite to the starting slip seat; The slip chain includes multiple intermediate slip seats, which are sequentially hinged to form a loop, and the two ends of the slip chain are respectively hinged to the starting slip seat and the ending slip seat; The slip bodies are respectively disposed on the intermediate slip seat, the starting slip seat and the ending slip seat; The locking block is rotatably mounted on the starting locking seat; An adjusting rod, passing through the termination slip seat and with one end connected to the starting slip seat; and A locking sleeve is threadedly connected to the adjusting rod and is located at the end of the terminating slip seat away from the starting slip seat.

10. A drilling apparatus, characterized in that, Includes the drill pipe structure as described in any one of claims 1-9.

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