Drill bit fishing device applied to well drilling construction

Abstract

The invention discloses a drill bit fishing device applied to drilling construction, and relates to the technical field of drilling construction, the drill bit fishing device comprises a drill bit main body, the drill bit main body comprises a threaded end fixedly connected to the upper end of the drill bit main body, and a fishing groove is formed in the surface of the drill bit main body; the fishing mechanism is arranged on the drill bit body and comprises a cylinder located at the upper end of the threaded end, a connecting end is fixed to the upper end of the cylinder, a righting positioning piece, a driving piece and a linkage piece are installed on the cylinder, and the driving piece is matched with the righting positioning piece and the linkage piece. Through a double centralizing mechanism, primary centralizing is achieved by means of the inclined faces of the centralizing hooks, then secondary accurate centralizing is completed through synchronous closing of the multiple hooks, the problem that inclined and wall-attached drill bits are difficult to position is effectively solved, and compared with a traditional device which can only process vertical drill bits, the device can adapt to drill bits of different postures, and especially in the deep well and complex geological environment, the device has the advantages of being simple in structure and convenient to use. The risk of fishing failure caused by inclination of the drill bit is greatly reduced, and the borehole scrapping probability is reduced.

Description

Technical Field

[0001] This invention relates to the field of drilling construction technology, and in particular to a drill bit retrieval device used in drilling construction. Background Technology

[0002] During drilling operations, drill bits are prone to malfunctions such as falling off or tilting due to complex geology, aging equipment, or improper operation. They need to be retrieved using a retrieval device to avoid the wellbore becoming unusable.

[0003] However, in practical applications, some problems remain unresolved. The following are some common issues with drill bit retrieval devices used in drilling operations: First, they have weak ability to straighten inclined drill bits. Most devices can only retrieve drill bits in a vertical position. Inclined drill bits are prone to retrieval failure or secondary damage to the wellbore due to uneven force. Second, they have poor fixing stability. Traditional devices rely on a single hook or clamp for fixing, and the drill bit is prone to falling off during the retrieval process, especially in deep wells or high-pressure environments where the risk is even higher. Third, they are complex to operate, requiring repeated manual adjustments to the device position and fixing structure, and are inefficient when adapting to drill bits with different postures. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing drill bit retrieval devices used in drilling operations, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to address the difficulties in straightening inclined drill bits, insufficient drill bit fixation stability, and the problems of complex operation and poor adaptability.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a drill bit retrieval device applied to drilling operations, comprising: a drill bit body, including a threaded end fixedly connected to its upper end, wherein a retrieval groove is formed on the surface of the drill bit body; a retrieval mechanism, disposed on the drill bit body, including a column located above the threaded end, wherein a connecting end is fixedly attached to the upper end of the column, wherein a centering and positioning component, a driving component, and a linkage component are respectively installed on the column, wherein the driving component cooperates with the centering and positioning component and the linkage component, wherein a centering and fixing component is installed on the linkage component and cooperates with the threaded end, wherein a limiting component is installed on the column and cooperates with the driving component, wherein a linkage component is installed between the centering and fixing component and the centering and positioning component; and a drill rod, threadedly connected to the connecting end.

[0008] As a preferred embodiment of the drill bit retrieval device applied to drilling operations according to the present invention, the straightening and positioning component includes a support frame fixed to the surface of a column, an I-shaped block sliding on the support frame, a short column fixed to the top of the I-shaped block and cooperating with a driving component, a straightening hook fixed to the bottom of the I-shaped block and cooperating with the drill bit body and the retrieval groove, a locking block sliding on the lower surface of the straightening hook, a groove being formed on the lower surface of the straightening hook, a square column sliding in the groove, one end of the square column being fixed to one side of the locking block, and a spring piece being fixed between the surface of the locking block and the surface of the straightening hook.

[0009] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, the following features are provided: a second groove and a third groove are respectively provided inside the centering hook; a circular hole is provided on the lower surface of the centering hook; the second groove is connected to the circular hole and the third groove; a pressing block slides inside the second groove; a moving plate slides inside the third groove; a trigger post slides on the locking block; the pressing block cooperates with the trigger post and the moving plate; a groove is provided on the I-shaped block; an L-shaped block slides on the I-shaped block and the centering hook; one end of the L-shaped block is fixed to the upper surface of the moving plate, and the other end is fixed to a stop plate; a rubber pad is fixed to the upper surface of the stop plate; a toothed groove is provided at the bottom of the support frame, and the rubber pad cooperates with the toothed groove.

[0010] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, the driving component includes a turntable rotating within a cylindrical body. An arc-shaped frame slides on the cylindrical body, with one end of the arc-shaped frame fixed to the surface of the turntable. The arc-shaped frame is fitted onto the surface of a short column, and they cooperate with each other. A driving column slides on the cylindrical body and the turntable. A driving groove and a limiting groove are respectively opened on the surface of the driving column. A ball bearing is embedded in the inner surface of the turntable, and the ball bearing slides in the driving groove. A cone block is fixed at the upper end of the driving column, and a limiting component cooperates with the cone block. A limiting block is fixed on the inner wall of the cylindrical body, and the limiting block slides in the limiting groove. A pressure block rotates at the lower end of the driving column, and the pressure block cooperates with the threaded end.

[0011] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, the linkage includes: a fixing block fixed to the bottom of the column, a rotating column rotating on the fixing block, a connecting plate fixedly sleeved on the surface of the rotating column, and a central fixing member fixed to one end of the connecting plate; a circular block fixedly sleeved on the upper surface of the drive column; a connecting block sliding on the inner wall of the column, with one end of the connecting block fixed to the surface of the circular block; a steel rope fixed to the bottom of the connecting block, the lower end of the steel rope passing through the turntable and the column and fixed to the surface of the central fixing member; and a pulley rotating at the bottom of the column, with the pulley cooperating with the steel rope.

[0012] As a preferred embodiment of the drill bit retrieval device applied to drilling operations according to the present invention, wherein: the central fixing member includes an arc-shaped plate fixed to one end of the connecting plate, the lower end of the steel rope is fixed to the surface of the arc-shaped plate, a toothed plate slides on the surface of the arc-shaped plate and the toothed plate cooperates with the threaded end, a T-shaped groove is opened inside the arc-shaped plate, a T-shaped block is fixed on one side of the toothed plate and the T-shaped block slides in the T-shaped groove, a circular groove is opened on the inner wall of the T-shaped groove, a second spring is fixed between the surface of the T-shaped block and the inner wall of the circular groove, an arc-shaped groove one and an arc-shaped groove two are respectively opened on the arc-shaped plate, an arc-shaped block slides in the arc-shaped groove one and the arc-shaped block cooperates with the arc-shaped groove two, and a fifth spring is fixed between the surface of the arc-shaped block and the inner wall of the arc-shaped groove one.

[0013] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, wherein: an anti-detachment groove is provided on the inner wall of the arc-shaped groove, an anti-detachment block is fixed on the surface of the arc-shaped block and slides in the anti-detachment groove, a fixing bolt is threadedly connected to the arc-shaped plate and the fixing bolt cooperates with the arc-shaped block, and a handle is fixed on the surface of the arc-shaped block.

[0014] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, the limiting member includes a square groove formed in the inner wall of the column, a slidable clamping plate in the square groove and cooperating with a conical block, a spring fixed between the surface of the clamping plate and the inner wall of the square groove, a through groove formed in the clamping plate, a square rod slidably on the column and the clamping plate, a pull block fixed at one end of the square rod in the through groove and cooperating with the clamping plate, a rotating frame rotatably on the surface of the column, a guide groove formed in the inner wall of the rotating frame, a guide post fixed at one end of the square rod in the rotating frame and sliding in the guide groove.

[0015] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, the rotating frame surface is provided with a handle groove, the inner wall of the square groove is provided with a positioning groove, and a positioning block is fixed on the surface of the clamping plate, and the positioning block slides in the positioning groove.

[0016] As a preferred embodiment of the drill bit retrieval device for drilling operations described in this invention, the linkage component includes a reinforcing plate fixed to the surface of the straightening hook, a sliding hole being provided on the surface of the reinforcing plate, a linkage plate being fixed to the surface of the arc-shaped plate, and a sliding column being fixed to one end of the linkage plate, with the sliding column sliding within the sliding hole.

[0017] The beneficial effects of this invention are as follows: 1. Through a dual straightening mechanism, the initial straightening is achieved by using the inclined surface of the straightening hook, and then the secondary precise straightening is completed by the synchronous approach of multiple hooks. This effectively solves the problem of difficult positioning of inclined and wall-attached drill bits. Compared with traditional devices that can only handle vertical drill bits, this device can be adapted to drill bits of different postures. Especially in deep wells and complex geological environments, it greatly reduces the risk of retrieval failure caused by drill bit inclination and reduces the probability of wellbore abandonment.

[0018] The system employs a dual fixing structure of "ring clamp + hook groove limit". The central fixing components combine to form a high-strength clamp that tightly wraps around the threaded end of the drill bit. At the same time, the straightening hook is embedded in the retrieval groove, and the linkage component strengthens the connection between the two, preventing the drill bit from falling off due to vibration and well wall friction during retrieval. In addition, the limit component locks the position of the drive component, ensuring the stability of each structure during retrieval, further improving the fixing reliability, reducing the occurrence of secondary failures, and ensuring safe and efficient retrieval operations.

[0019] The device uses a drive mechanism to control the alignment and fixing actions. The entire process can be triggered simply by lowering the drill rod, eliminating the need for repeated manual adjustments to the position or operation of the fixing structure. This significantly reduces the operation time. In addition, the device is compatible with drill bits of different postures, eliminating the need to replace special parts and reducing the difficulty of operation and labor costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a scene illustration of a drill bit retrieval device used in drilling operations.

[0022] Figure 2 Drill bit retrieval device for use in drilling operations Figure 1 Enlarged view of region A in the middle.

[0023] Figure 3 This is a partial cross-sectional plan view of a drill bit retrieval device used in drilling operations.

[0024] Figure 4 Drill bit retrieval device for use in drilling operations Figure 3 Enlarged view of region B in the middle.

[0025] Figure 5 Drill bit retrieval device for use in drilling operations Figure 3 Enlarged view of region C.

[0026] Figure 6Drill bit retrieval device for use in drilling operations Figure 3 Enlarged view of region D in the middle.

[0027] Figure 7 Drill bit retrieval device for use in drilling operations Figure 3 Enlarged view of region E in the middle.

[0028] Figure 8 Drill bit retrieval device for use in drilling operations Figure 3 Enlarged view of the F region.

[0029] Figure 9 Drill bit retrieval device for use in drilling operations Figure 3 Enlarged view of the G region.

[0030] Figure 10 This is a partial cross-sectional plan view of the centering hook and chuck of a drill bit retrieval device used in drilling operations.

[0031] Figure 11 This is a partial sectional perspective view of the centering hook of a drill bit retrieval device used in drilling operations.

[0032] Figure 12 This is a partial sectional perspective view of the I-shaped block and the centering hook of a drill bit retrieval device used in drilling operations.

[0033] Figure 13 Drill bit retrieval device for use in drilling operations Figure 12 Enlarged view of region H in the middle.

[0034] Figure 14 This is a cross-sectional plan view of the cylinder and rotary table of a drill bit retrieval device used in drilling operations.

[0035] Figure 15 This is a cross-sectional plan view of the arc-shaped plate and arc-shaped block of a drill bit retrieval device used in drilling operations.

[0036] Figure 16 A three-dimensional view of the drive column and pressure block of a drill bit retrieval device used in drilling operations.

[0037] Figure 17 This is a three-dimensional view of the cone and limiting block of a drill bit retrieval device used in drilling operations.

[0038] Figure 18 This is a sectional view of the rotating frame of a drill bit retrieval device used in drilling operations.

[0039] In the diagram: 1. Drill bit body; 11. Threaded end; 12. Fishing groove; 2. Fishing mechanism; 21. Column; 22. Connecting end; 23. Centering and positioning component; 24. Driving component; 25. Linking component; 26. Centering fixing component; 27. Limiting component; 28. Linkage component; 29. ​​Roller; 3. Drill rod; 231. Support frame; 232. I-beam block; 233. Centering hook; 234. Clamping block; 235. Groove body one; 236. Square column; 237. Spring piece one; 238. Groove body two; 239. Round hole; 2310. Extrusion block; 2311. 2312. Moving plate; 2313. Groove three; 2314. Groove; 2315. L-shaped block; 2316. Support plate; 2317. Rubber pad; 2318. Toothed groove; 2319. Trigger post; 2310. Slide groove one; 2321. Slider one; 2322. Spring two; 2323. Slide groove two; 2324. Slide groove three; 2325. Slider three; 2326. Spring three; 2327. Spring four; 2328. Short post; 241. Turntable; 242. Arc frame; 243. Drive post; 244. Drive groove; 245. Limiting groove; 246. Ball bearing; 247. Conical block; 248. Limiting block; 249. Pressure block; 2410. Spring 1; 2411. Fixing plate; 2412. Sensor; 251. Fixing block; 252. Rotating column; 253. Connecting plate; 254. Round block; 255. Connecting block; 256. Steel rope; 257. Pulley; 258. Torsion spring; 259. Movable wheel; 261. Arc plate; 262. Toothed plate; 263. T-slot; 264. T-block; 265. Round groove; 266. Handle; 267. Spring 2; 268. Arc-shaped groove one; 269. Arc-shaped groove two; 2610. Arc-shaped block; 2611. Spring five; 2612. Anti-detachment groove; 2613. Anti-detachment block; 2614. Fixing bolt; 271. Square groove; 272. Clamping plate; 273. Spring three; 274. Through groove; 275. Square rod; 276. Pull block; 277. Rotating frame; 278. Guide groove; 279. Guide post; 2710. Handle groove; 2711. Positioning groove; 2712. Positioning block; 281. Reinforcing plate; 282. Sliding hole; 283. Linkage plate; 284. Sliding post. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0043] Example 1, referring to Figures 1-3 This is the first embodiment of the present invention. This embodiment provides a drill bit retrieval device for drilling operations. The drill bit retrieval device for drilling operations includes a drill bit body 1, a retrieval mechanism 2, and a drill rod 3.

[0044] Specifically, the drill bit body 1 includes a threaded end 11 fixedly connected to its upper end. A retrieval groove 12 is provided on the surface of the drill bit body 1. The threaded end 11 facilitates the connection of the drill bit body 1 to the drill rod 3 during drilling operations. When the drill bit needs to be retrieved after disconnection, the centering fixing member 26 on the retrieval mechanism 2 can be fixed on its surface to form a stable connection and prevent it from falling off. The retrieval groove 12 is circumferentially opened on the surface of the drill bit body 1, which facilitates the lower end of the subsequent straightening positioning member 23 to be hooked inside it. Then, as the retrieval mechanism 2 moves upward, the drill bit is retrieved.

[0045] Specifically, the retrieval mechanism 2 is mounted on the drill bit body 1 and includes a column 21 located at the upper end of the threaded end 11. A connecting end 22 is fixed at the upper end of the column 21. A centering and positioning component 23, a driving component 24, and a linkage component 25 are respectively installed on the column 21. The driving component 24 cooperates with the centering and positioning component 23 and the linkage component 25. A centering and fixing component 26 is installed on the linkage component 25 and cooperates with the threaded end 11. A limiting component 27 is installed on the column 21 and cooperates with the driving component 24. A linkage component 28 is installed between the centering and fixing component 26 and the centering and positioning component 23.

[0046] The connecting end 22 is threaded, and its size is the same as that of the threaded end 11 on the drill bit body 1. The retrieval mechanism 2 can be directly installed at the lower end of the original drill rod 3 with the help of the connecting end 22, without the need to replace it with another drill rod 3. There are several upright positioning parts 23, and they are distributed in a circular array around the column 21.

[0047] By setting the straightening and positioning component 23, when the drill bit is tilted and retrieved in the well, the drill bit can be straightened once, and then straightened a second time with the cooperation of the drive component 24 and the drill bit, which plays a role in centering. Then, after the centering fixing component 26 is fixed in the center, it plays the role of limiting and hooking the drill bit with the cooperation of the retrieval groove 12. When the retrieval mechanism 2 moves upward with the drill rod 3, the straightening and positioning component 23 moves upward to retrieve the drill bit.

[0048] With the setting of the drive component 24, when the straightening and positioning component 23 straightens the drill bit once, it moves down with the drill rod 3 and contacts the upper end of the threaded end 11 at the upper end of the drill bit. Then, as the drill rod 3 moves down, it acts to straighten and position the drill bit 23 and the linkage component 25, so that the circumferentially distributed straightening and positioning components 23 move closer to each other to straighten the drill bit a second time. The linkage component 25 drives the centering fixing component 26 to center the drill bit and fix the centering fixing component 26 to the threaded end 11 of the drill bit.

[0049] While satisfying the needs of tilted drill bit retrieval, the retrieval mechanism 2 can also satisfy the needs of non-tilted drill bit retrieval with its upper end attached to the wall. When the retrieval mechanism 2 moves down with the drill rod 3, the straightening and positioning component 23 does not straighten the drill bit once, but directly makes the driving component 24 contact the drill bit to act, so that the straightening and positioning component 23, the linkage component 25 and the centering fixing component 26 operate and act on the drill bit that needs to be retrieved.

[0050] There are several centering fixing parts 26 and several linkage parts 28, which correspond to the number of centering positioning parts 23. The centering fixing parts 26 and the linkage parts 28 are arranged in a circumferential array. The centering fixing parts 26 cooperate with each other in pairs. With the setting of the centering fixing parts 26, under the action of the driving part 24, they swing and move closer to each other in a circumferential distribution, thereby pushing the drill bit towards the center and playing a centering role. As multiple swinging and approaching, they are fixed to the threaded end 11 of the drill bit. At the same time, the multiple centering fixing parts 26 are connected to each other to form a ring-like clamp, forming a whole to improve strength and enhance the anti-dislodgement function. This reduces the tilting of the drill bit during retrieval and can stably limit the centering positioning parts 23 to be hooked at the retrieval groove 12.

[0051] By setting the limiting component 27, when the driving component 24 contacts the drill bit and moves downward with the column 21, it is limited, thereby limiting the centering and positioning component 23, the linkage component 25 and the centering fixing component 26, ensuring stability during the salvage process, and facilitating the subsequent release of the limit. By setting the linkage component 28, the centering fixing component 26 and the centering and positioning component 23 are connected. When multiple centering fixing components 26 are connected and combined to form a ring-like clamp, they can hold the centering and positioning component 23, improving the strength of the centering and positioning component 23.

[0052] Specifically, the drill pipe 3 is threaded to the connecting end 22. The lower end of the drill pipe 3 is provided with a threaded groove, which is adapted to the threaded end 11 on the drill bit and the connecting end 22 on the retrieval mechanism 2. During drilling, the drill bit can be fixed at the lower end of the drill pipe 3, and during retrieval, the retrieval mechanism 2 can be installed at the lower end of the drill pipe 3.

[0053] Example 2, refer to Figures 3 to 17 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0054] Specifically, the centering and positioning component 23 includes a support frame 231 fixed to the surface of the column 21, an I-shaped block 232 sliding on the support frame 231, a short column 2328 fixed to the top of the I-shaped block 232, and the short column 2328 cooperating with the driving component 24. There are several support frames 231, which are distributed in a circumferential array on the surface of the column 21. The shape of the I-shaped block 232 allows it to slide on the support frame 231 without detaching. A centering hook 233 is fixed to the bottom of the I-shaped block 232, and the centering hook 233 cooperates with the drill bit body 1 and the retrieval groove 12. A locking block 234 slides on the lower surface of the centering hook 233. A groove 235 is opened on the lower surface of the centering hook 233. A square column 236 slides in the groove 235, and one end of the square column 236 is fixed to one side of the locking block 234. A spring piece 237 is fixed between the surface of the locking block 234 and the surface of the centering hook 233.

[0055] By setting the short column 2328, it moves under the rotational drive of the arc frame 242 on the drive member 24, thereby driving the I-shaped block 232 and the straightening hook 233 to move, so that the circumferentially distributed straightening hooks 233 move closer or further away from each other synchronously. The lower end of the straightening hook 233 is provided with a hook part, and the hook part is provided with an inclined surface. With this setting, when one of the circumferentially distributed straightening hooks 233 contacts the drill bit position at the inclined position, the inclined surface contacts and squeezes it when it moves down, which can push the drill bit to swing and play a primary straightening role. And with the action of the drive member 24, the multiple straightening hooks 233 move closer to each other and play a secondary straightening role.

[0056] With the setting of the locking block 234, after it moves with the straightening hook 233 and comes into contact with the drill bit, it is subjected to pressure and moves on the straightening hook 233, causing the spring piece 237 to deform. Under the action of the straightening hook 233 moving down with the column 21, the support frame 231 and the I-shaped block 232, the hook part of the straightening hook 233 corresponds to the retrieval groove 12. Under the action of the spring piece 237 rebounding, the locking block 234 is pushed into the retrieval groove 12, which plays a role in retrieval support during the lifting and retrieval process. The square column 236 and the groove 235 guide the locking block 234, so that it slides stably on the straightening hook 233.

[0057] Specifically, the straightening hook 233 has a second groove 238 and a third groove 2312 inside. A circular hole 239 is formed on the lower surface of the straightening hook 233. The second groove 238 is connected to both the circular hole 239 and the third groove 2312. A pressing block 2310 slides inside the second groove 238, and a moving plate 2311 slides inside the third groove 2312. A trigger post 2318 slides on the locking block 234. The pressing block 2310 is connected to the trigger post 2318. In conjunction with the movable plate 2311, the I-shaped block 232 has a groove 2313, and an L-shaped block 2314 slides on the I-shaped block 232 and the straightening hook 233. One end of the L-shaped block 2314 is fixed to the upper surface of the movable plate 2311, and the other end is fixed to a support plate 2315. A rubber pad 2316 is fixed to the upper end of the support plate 2315. A toothed groove 2317 is provided at the bottom of the support frame 231, and the rubber pad 2316 cooperates with the toothed groove 2317.

[0058] Both ends of the trigger post 2318 are chamfered, and both ends of the compression block 2310 are beveled. The end of the moving plate 2311 that mates with the compression block 2310 is also beveled. With this design, when the locking block 234 moves into the retrieval trough 12 after the spring piece 237 rebounds, the trigger post 2318 aligns with the round hole 239. During the retrieval and lifting process, the weight of the drill bit needs to be overcome. After the drill bit contacts the trigger post 2318, it acts. Under the relative pressure of the drill bit, the trigger post 2318 moves on the locking block 234. The lower end of the trigger post 2318 passes through the round hole 239 and inserts into the second trough 238 to press the compression block 2310, thereby causing the compression block 2310 to move and compress the moving plate 2311, which in turn moves the moving plate 2311 within the third trough 2312.

[0059] With the setting of the toothed groove 2317, the L-shaped block 2314 moves along with the moving plate 2311, causing the abutment plate 2315 and rubber pad 2316 to move, so that the rubber pad 2316 comes into contact with the toothed groove 2317, improving the interaction between the rubber pad 2316 and the support frame 231. In turn, with the help of gravity during the drill bit retrieval process, the fixing effect of the I-shaped block 232 on the support frame 231 after it stops moving is improved, and gravity fastening ensures stability.

[0060] Specifically, the driving component 24 includes a turntable 241 that rotates within the column 21. An arc-shaped frame 242 slides on the column 21, with one end of the arc-shaped frame 242 fixed to the surface of the turntable 241. There are several arc-shaped frames 242 arranged in a circular array on the surface of the turntable 241. The arc-shaped frames 242 are fitted onto the surface of the short column 2328 and cooperate with each other. The rotation of the turntable 241 drives the rotation of the arc-shaped frames 242, thereby causing the short column 2328 to move within the arc-shaped frames 242. This drives the movement of the I-shaped block 232 and the straightening hook 233, causing multiple sets of straightening hooks 233 to move closer to each other to straighten the drill bit.

[0061] A drive column 243 slides on the column 21 and the turntable 241. The surface of the drive column 243 is provided with a drive groove 244 and a limiting groove 245. A ball bearing 246 is embedded in the inner surface of the turntable 241 and slides in the drive groove 244. A cone block 247 is fixed at the upper end of the drive column 243 and a limiting member 27 cooperates with the cone block 247. A limiting block 248 is fixed on the inner wall of the column 21 and slides in the limiting groove 245. The driving column 243 is guided and limited by the limiting groove 245 and the limiting block 248, so that the drive column 243 and the column 21 will not rotate during relative movement. A pressure block 249 rotates at the lower end of the drive column 243 and cooperates with the threaded end 11.

[0062] The drive groove 244 is divided into three parts. The first and third parts are in which the ball bearings 246 do not cause the turntable 241 to rotate when they move within them. The second part is in which the ball bearings 246 can cause the turntable 241 to rotate when they move within it. Through the setting of the cone block 247, after the pressure block 249 moves down with the retrieval mechanism 2 and contacts the drill bit, pressure is applied, causing the column 21 and the turntable 241 to move on the drive column 243. During this process, the ball bearings 246 move from the first part of the drive groove 244 through the second part and into the third part. The three parts cause the turntable 241 to rotate, which in turn causes the straightening hook 233 and the locking block 234 to act on the drill bit to straighten it. Then, as the ball bearing 246 moves in the third part, the locking block 234 moves into the retrieval slot 12 under the action of the spring piece 237. After the column 21 moves on the drive column 243, the cone block 247 is limited by the limiting member 27, so that the straightening positioning member 23, the linkage member 25 and the centering fixing member 26 will not reset during the retrieval process.

[0063] Specifically, the linkage 25 includes a fixing block 251 fixed to the bottom of the column 21, a rotating column 252 rotating on the fixing block 251, a connecting plate 253 fixedly sleeved on the surface of the rotating column 252, and a central fixing member 26 fixed to one end of the connecting plate 253. A round block 254 is fixedly sleeved on the upper surface of the drive column 243. A connecting block 255 slides on the inner wall of the column 21, and one end of the connecting block 255 is fixed to the surface of the round block 254. A steel rope 256 is fixed to the bottom of the connecting block 255. The lower end of the steel rope 256 passes through the turntable 241 and the column 21 and is fixed to the surface of the central fixing member 26. A pulley 257 rotates at the bottom of the column 21, and the pulley 257 cooperates with the steel rope 256.

[0064] With the steel cable 256 in place, when the drive column 243 slides relative to the column 21, the round block 254 and the connecting block 255 move within the column 21. The steel cable 256 then pulls the centering fixing member 26 and the connecting plate 253 to rotate, causing multiple sets of centering fixing members 26 to move closer to each other and fix them to the threaded end 11 of the drill bit. The pulley 257 guides the steel cable 256, making it easier to pull. The turntable 241 has a moving groove that cooperates with the steel cable 256, so that the turntable 241 does not act on the steel cable 256 when it rotates.

[0065] Example 3, referring to Figures 3 to 18 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0066] Specifically, the centering fixing member 26 includes an arc-shaped plate 261 fixed to one end of the connecting plate 253, the lower end of the steel rope 256 fixed to the surface of the arc-shaped plate 261, a toothed plate 262 sliding on the surface of the arc-shaped plate 261, and the toothed plate 262 cooperating with the threaded end 11. A T-slot 263 is formed inside the arc-shaped plate 261, and a T-block 264 is fixed to one side of the toothed plate 262, and the T-block 264 slides in the T-slot 263. 4 and T-slot 263 can limit the toothed plate 262 on the arc plate 261, and the toothed plate 262 can move on the arc plate 261. After the arc plate 261 is swung by the connecting plate 253, the toothed plate 262 on it is locked onto the threaded end 11. During the retrieval process, the drill bit and the toothed plate 262 can move relative to each other on the arc plate 261, so that the weight of the drill bit can act on the trigger pin 2318 on the chuck block 234.

[0067] A circular groove 265 is formed on the inner wall of the T-slot 263. A spring 267 is fixed between the surface of the T-block 264 and the inner wall of the circular groove 265. With the setting of the spring 267, the T-block 264 moves and is compressed when the toothed plate 262 moves on the arc plate 261, providing force for the subsequent reset of the T-block 264 and the toothed plate 262 on the arc plate 261. Arc groove 268 and arc groove 269 are formed on the arc plate 261 respectively. An arc block 2610 slides in the arc groove 268 and the arc block 2610 cooperates with the arc groove 269. A spring piece 2611 is fixed between the surface of the arc block 2610 and the inner wall of the arc groove 268.

[0068] By setting the arc-shaped block 2610, during the swinging and rotating process of the arc-shaped plates 261 approaching each other, the arc-shaped block 2610 will first contact the other adjacent arc-shaped plate 261. After being squeezed, the arc-shaped block 2610 moves in the arc groove 268 of the arc-shaped plate 261. During this process, the spring piece 2611 deforms. After the toothed plates 262 on the subsequent sets of arc-shaped plates 261 are engaged with the threaded end 11, the arc-shaped plates 261 are on the same center and the same radius. Under the action of the spring piece 2611, the arc-shaped block 2610 is inserted into the arc groove 269 on the adjacent arc-shaped plate 261, and then combined to form a ring-like clamp, forming a whole to improve strength and enhance the anti-dislodgement function. During this process, the drill bit is pushed towards the center, playing a centralizing role.

[0069] Specifically, an anti-detachment groove 2612 is provided on the inner wall of the arc-shaped groove 268, and an anti-detachment block 2613 is fixed on the surface of the arc-shaped block 2610. The anti-detachment block 2613 slides in the anti-detachment groove 2612. The anti-detachment groove 2612 and the anti-detachment block 2613 limit the arc-shaped block 2610 to prevent it from detaching when moving on the arc-shaped plate 261. A fixing bolt 2614 is threaded on the arc-shaped plate 261, and the fixing bolt 2614 cooperates with the arc-shaped block 2610. A handle 266 is fixed on the surface of the arc-shaped block 2610.

[0070] By setting the fixing bolt 2614, when the drill bit is retrieved and the arc block 2610 on one arc plate 261 needs to be moved out of the arc groove 269 of another arc plate 261, the handle 266 is pulled to move the arc block 2610. Then the fixing bolt 2614 is rotated to fix the moved arc block 2610, thereby releasing the connection between multiple arc plates 261 and providing conditions for the subsequent rotation and reset of the arc plate 261.

[0071] Specifically, the limiting component 27 includes a square groove 271 formed in the inner wall of the column 21, a locking plate 272 sliding in the square groove 271 and cooperating with the cone block 247, a spring 273 fixed between the surface of the locking plate 272 and the inner wall of the square groove 271, a through groove 274 formed on the locking plate 272, a square rod 275 sliding on the column 21 and the locking plate 272, a pull block 276 fixed at one end of the square rod 275 located in the through groove 274 and cooperating with the locking plate 272, a rotating frame 277 rotating on the surface of the column 21, a guide groove 278 formed in the inner wall of the rotating frame 277, a guide post 279 fixed at one end of the square rod 275 located in the rotating frame 277 and sliding in the guide groove 278.

[0072] One end of the clamping plate 272 is provided with an inclined surface. With this setting, when the cone block 247 moves with the drive column 243, it contacts the clamping plate 272, thereby squeezing the clamping plate 272 into the square groove 271. At this time, the spring 273 is compressed. When the cone block 247 no longer squeezes the clamping plate 272, the clamping plate 272 is reset under the action of the spring 273, which limits the cone block 247. With the setting of the through groove 274, when the clamping plate 272 is squeezed and moved by the cone block 247, the clamping plate 272 will not be blocked by the pull block 276. The rotating frame 277 is rotatably connected to the column 21 through the bearing. The guide groove 278 is divided into three parts. The first and third parts are where the guide column 279 moves in it without causing the square rod 275 to move. The second part is where the guide column 279 moves in it and the square rod 275 can move.

[0073] Specifically, the rotating frame 277 has a handle groove 2710 on its surface, and the inner wall of the square groove 271 has a positioning groove 2711. The plate 272 has a positioning block 2712 fixed on its surface, and the positioning block 2712 slides in the positioning groove 2711. When the retrieval is completed and unlocking is required, the rod-shaped handle is inserted into the handle groove 2710, and then the rotating frame 277 is rotated so that the guide post 279 moves from the first part of the guide groove 278 through the second part to the third part. This causes the square rod 275 to drive the pull block 276 to move, thereby pulling the plate 272 to move and release the limit on the cone block 247. The positioning groove 2711 and the positioning block 2712 guide and limit the plate 272, allowing it to move within a certain range.

[0074] Specifically, the linkage 28 includes a reinforcing plate 281 fixed to the surface of the straightening hook 233. The surface of the reinforcing plate 281 is provided with a sliding hole 282. The surface of the arc plate 261 is fixed with a linkage plate 283. One end of the linkage plate 283 is fixed with a sliding column 284, and the sliding column 284 slides in the sliding hole 282. Through the setting of the sliding hole 282, the sliding column 284 moves in the sliding hole 282 under the transmission of the linkage plate 283 with the arc plate 261. This enables the arc plate 261 and the straightening hook 233 to interact, so that the arc plate 261 can provide a pulling force to the straightening hook 233, thereby improving the strength of the straightening hook 233 in limiting the drill bit.

[0075] Example 4, refer to Figures 3 to 13 This is the fourth embodiment of the present invention, which is based on the first three embodiments.

[0076] Specifically, the card block 234 has a sliding groove 2319 inside, and a slider 2320 is fixed on the surface of the trigger post 2318. The slider 2320 slides in the sliding groove 2319. The sliding groove 2319 and the slider 2320 guide and limit the trigger post 2318. A spring piece 2321 is fixed between the surface of the slider 2320 and the inner wall of the sliding groove 2319. The spring piece 2321 deforms when the slider 2320 moves with the trigger post 2318, providing force for subsequent reset. The inner wall of the groove 235 has a sliding groove 2322, and a slider 2323 is fixed on the surface of the square post 236. The slider 2323 slides in the sliding groove 2322. The sliding groove 2322 and the slider 2323 guide and limit the square post 236.

[0077] The inner wall of the second groove 238 is provided with a sliding groove 2324. A slider 2325 is fixed on the surface of the extrusion block 2310 and slides within the sliding groove 2324. The sliding groove 2324 and the slider 2325 can guide and limit the extrusion block 2310. A spring piece 2326 is fixed between the surface of the slider 2325 and the inner wall of the sliding groove 2324. The spring piece 2326 deforms when the slider 2325 moves with the extrusion block 2310, providing force for subsequent reset. A spring piece 2327 is fixed between the surface of the moving plate 2311 and the inner wall of the third groove 2312. The spring piece 2327 deforms when the extrusion block 2310 extrudes the moving plate 2311, providing force for subsequent reset of the moving plate 2311.

[0078] Specifically, a spring 2410 is fitted onto the lower surface of the drive column 243, with its two ends abutting against the bottom of the column 21 and the top of the pressure block 249, respectively. A fixing plate 2411 is fixed to the inner wall of the column 21, and a sensor 2412 is fixed to the bottom of the fixing plate 2411. Through the arrangement of the spring 2410, after the pressure block 249 contacts the drill bit, as the column 21 moves downward, the column 21 and the drive column 243 slide relative to each other, compressing the spring 2410, which then compresses the spring 2410 for subsequent... The reset provides the force. The retrieval mechanism 2 also includes a wireless transmitter and a remote terminal. When the cone block 247 moves into place in the column 21, the sensor 2412 detects the pressure and feeds it back to the remote terminal through the wireless transmitter, controlling the stop of the drill rod 3 moving downward. After the limiter 27 limits the cone block 247, the drill rod 3 and the retrieval mechanism 2 can be moved upward to retrieve the drill bit. This is the prior art. The working principle of this part is the prior art, which can be clearly understood by those skilled in the art, and will not be described in detail here.

[0079] Specifically, torsion springs 258 are fitted on both ends of the rotating column 252, and the two ends of the torsion springs 258 are fixed to the surface of the rotating column 252 and the inner wall of the fixing block 251, respectively. A movable wheel 259 rotates on the connecting plate 253, and the movable wheel 259 cooperates with the straightening hook 233. With the setting of the torsion spring 258, it deforms when the connecting plate 253 and the rotating column 252 rotate, providing a pulling force for the subsequent reset of the connecting plate 253. With the setting of the movable wheel 259, the resistance between them is reduced when the straightening hook 233 acts on the connecting plate 253.

[0080] Specifically, the lower surface of the centering hook 233 has a rotating roller 29. The setting of the roller 29 reduces the resistance between the retrieval mechanism 2 and the well wall when it moves down in the well, making it smoother.

[0081] During use, the initial straightening and drive triggering are as follows: the drill pipe 3 drives the fishing mechanism 2 to be lowered to the bottom of the well. If the drill bit is tilted, the inclined surface of a certain straightening hook 233 first contacts the drill bit. During the lowering process, the inclined surface squeezes the drill bit to achieve one straightening. The lowering continues so that the pressure block 249 of the drive component 24 contacts the threaded end 11 of the drill bit. The pressure block 249 is pressed and drives the drive column 243 to move relative to the column body 21. The spring 2410 is compressed, and the ball 246 slides along the drive groove 244 to drive the turntable 241 to rotate.

[0082] Secondary straightening and centering fixation: The turntable 241 drives the arc frame 242 to rotate, and the short column 2328 pushes the I-shaped block 232 to slide along the support frame 231, so that multiple sets of straightening hooks 233 move together synchronously to complete the secondary straightening; at the same time, the drive column 243 moves to drive the connecting block 255 and the steel rope 256, and the steel rope 256 pulls the connecting plate 253 of the linkage 25 to rotate, causing the arc plate 261 of the centering fixation member 26 to swing closer, the toothed plate 262 on the arc plate 261 fits the threaded end 11, and the adjacent arc blocks 2610 are embedded in the opposite arc groove 269, forming a ring clamp to achieve the centering fixation of the drill bit.

[0083] Limiting and locking and retrieval: After the drive column 243 moves into place, the clamping plate 272 of the limiting component 27 limits the cone block 247 under the action of the spring 273, locking the drive component 24 and the position of each structure; during retrieval, the weight of the drill bit causes the trigger column 2318 to move down, the squeezing block 2310 pushes the moving plate 2311, driving the L-shaped block 2314 and the abutment plate 2315 to move, the rubber pad 2316 presses the tooth groove 2317 below the support frame 231, further fixing the straightening hook 233; finally, the drill rod 3 is lifted, the straightening hook 233 hooks the retrieval groove 12, the center clamp prevents detachment, and the drill bit recovery is completed.

[0084] Unlocking and Resetting: After the salvage is completed, the rotating frame 277 drives the square rod 275 and the pull block 276, pulls the card plate 272 to release the limit on the cone block 247, and the elastic components such as spring 2410 and torsion spring 258 are reset, and each structure returns to its initial state for easy use next time.

[0085] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A drill bit retrieval device used in drilling operations, characterized in that: include, The drill bit body (1) includes a threaded end (11) fixedly connected to its upper end, and a retrieval groove (12) is provided on the surface of the drill bit body (1). The retrieval mechanism (2) is mounted on the drill bit body (1) and includes a column (21) located at the upper end of the threaded end (11). A connecting end (22) is fixed at the upper end of the column (21). A centering and positioning component (23), a driving component (24), and a linkage component (25) are respectively mounted on the column (21). The driving component (24) cooperates with the centering and positioning component (23) and the linkage component (25). A centering fixing component (26) is mounted on the linkage component (25), and the centering fixing component (26) cooperates with the threaded end (11). A limiting component (27) is mounted on the column (21), and the limiting component (27) cooperates with the driving component (24). A linkage component (28) is installed between the centering fixing component (26) and the centering and positioning component (23). The drill rod (3) is threaded onto the connecting end (22).

2. The drill bit retrieval device for drilling operations as described in claim 1, characterized in that: The straightening and positioning component (23) includes a support frame (231) fixed to the surface of the column (21), an I-shaped block (232) sliding on the support frame (231), a short column (2328) fixed to the top of the I-shaped block (232), and the short column (2328) cooperating with the driving component (24), a straightening hook (233) fixed to the bottom of the I-shaped block (232), and the straightening hook (233) cooperating with the drill bit body (1) and the retrieval groove (12), a locking block (234) sliding on the lower surface of the straightening hook (233), a groove (235) opened on the lower surface of the straightening hook (233), a square column (236) sliding in the groove (235), and one end of the square column (236) fixed to one side of the locking block (234), and a spring piece (237) fixed between the surface of the locking block (234) and the surface of the straightening hook (233).

3. The drill bit retrieval device for drilling operations as described in claim 2, characterized in that: The straightening hook (233) has a second groove (238) and a third groove (2312) inside. The lower surface of the straightening hook (233) has a round hole (239). The second groove (238) is connected to the round hole (239) and the third groove (2312) respectively. A pressing block (2310) slides in the second groove (238). A moving plate (2311) slides in the third groove (2312). A trigger post (2318) slides on the locking block (234). The pressing block (2310) is connected to the trigger post (2318) respectively. 8) In conjunction with the movable plate (2311), the I-shaped block (232) has a groove (2313) and an L-shaped block (2314) slides on the I-shaped block (232) and the straightening hook (233). One end of the L-shaped block (2314) is fixed to the upper surface of the movable plate (2311), and the other end is fixed to a stop plate (2315). A rubber pad (2316) is fixed to the upper end of the stop plate (2315). A toothed groove (2317) is opened at the bottom of the support frame (231), and the rubber pad (2316) cooperates with the toothed groove (2317).

4. The drill bit retrieval device for drilling operations as described in claim 2, characterized in that: The driving component (24) includes a turntable (241) rotating within a column (21). An arc-shaped frame (242) slides on the column (21), with one end of the arc-shaped frame (242) fixed to the surface of the turntable (241). The arc-shaped frame (242) is fitted onto the surface of a short column (2328), and they are in tandem. A driving column (243) slides on the column (21) and the turntable (241). A driving groove (244) and a limiting groove (245) are respectively provided on the surface of the driving column (243). The inner surface of the turntable (241) is embedded with a ball (246), and the ball (246) slides in the drive groove (244). The upper end of the drive column (243) is fixed with a cone block (247), and the limiting member (27) cooperates with the cone block (247). The inner wall of the column (21) is fixed with a limiting block (248), and the limiting block (248) slides in the limiting groove (245). The lower end of the drive column (243) is rotated with a pressure block (249), and the pressure block (249) cooperates with the threaded end (11).

5. The drill bit retrieval device for drilling operations as described in claim 4, characterized in that: The linkage (25) includes a fixing block (251) fixed to the bottom of the column (21), a rotating column (252) rotating on the fixing block (251), a connecting plate (253) fixedly sleeved on the surface of the rotating column (252), and a central fixing member (26) fixed to one end of the connecting plate (253). A round block (254) is fixedly sleeved on the upper surface of the drive column (243). A connecting block (255) slides on the inner wall of the column (21), and one end of the connecting block (255) is fixed to the surface of the round block (254). A steel rope (256) is fixed at the bottom of the connecting block (255). The lower end of the steel rope (256) passes through the turntable (241) and the column (21) and is fixed to the surface of the central fixing member (26). A pulley (257) rotates at the bottom of the column (21), and the pulley (257) cooperates with the steel rope (256).

6. The drill bit retrieval device for drilling operations as described in claim 5, characterized in that: The central fixing component (26) includes an arc-shaped plate (261) fixed to one end of the connecting plate (253). The lower end of the steel rope (256) is fixed to the surface of the arc-shaped plate (261). A toothed plate (262) slides on the surface of the arc-shaped plate (261), and the toothed plate (262) cooperates with the threaded end (11). A T-slot (263) is provided inside the arc-shaped plate (261). A T-block (264) is fixed on one side of the toothed plate (262), and the T-block (264) slides in the T-slot (263). (263) A circular groove (265) is provided on the inner wall. A spring (267) is fixed between the surface of the T-shaped block (264) and the inner wall of the circular groove (265). An arc groove (268) and an arc groove (269) are respectively provided on the arc plate (261). An arc block (2610) slides in the arc groove (268) and the arc block (2610) cooperates with the arc groove (269). A spring piece (2611) is fixed between the surface of the arc block (2610) and the inner wall of the arc groove (268).

7. The drill bit retrieval device for drilling operations as described in claim 6, characterized in that: The inner wall of the arc-shaped groove (268) is provided with an anti-detachment groove (2612). An anti-detachment block (2613) is fixed on the surface of the arc-shaped block (2610), and the anti-detachment block (2613) slides in the anti-detachment groove (2612). A fixing bolt (2614) is threaded on the arc-shaped plate (261), and the fixing bolt (2614) cooperates with the arc-shaped block (2610). A handle (266) is fixed on the surface of the arc-shaped block (2610).

8. The drill bit retrieval device for drilling operations as described in claim 4, characterized in that: The limiting member (27) includes a square groove (271) formed in the inner wall of the column (21), a retaining plate (272) sliding in the square groove (271) and cooperating with the cone block (247), a spring (273) fixed between the surface of the retaining plate (272) and the inner wall of the square groove (271), a through groove (274) formed on the retaining plate (272), and a square rod (275) sliding on the column (21) and the retaining plate (272). The square rod (275) is located in the through groove (274) with a pull block (276) fixed at one end, and the pull block (276) cooperates with the card plate (272). The surface of the column (21) has a rotating frame (277) that rotates. The inner wall of the rotating frame (277) is provided with a guide groove (278). The square rod (275) is located in the rotating frame (277) with a guide post (279) fixed at one end, and the guide post (279) slides in the guide groove (278).

9. The drill bit retrieval device for drilling operations as described in claim 8, characterized in that: The rotating frame (277) has a handle groove (2710) on its surface, the square groove (271) has a positioning groove (2711) on its inner wall, and the card plate (272) has a positioning block (2712) fixed on its surface, and the positioning block (2712) slides in the positioning groove (2711).

10. The drill bit retrieval device for drilling operations as described in claim 6, characterized in that: The linkage component (28) includes a reinforcing plate (281) fixed to the surface of the straightening hook (233), a sliding hole (282) is provided on the surface of the reinforcing plate (281), a linkage plate (283) is fixed on the surface of the arc plate (261), a sliding column (284) is fixed at one end of the linkage plate (283), and the sliding column (284) slides in the sliding hole (282).

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