Retractable fishing spear for geological core drilling
By designing an expansion mechanism and retrieval slips for a retractable retrieval spear, the problem of difficult drill pipe retrieval under different geological conditions was solved, achieving effective drill pipe retrieval and avoiding slippage.
Patent Information
- Application Number
- CN202423312071.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing retractable retrieval spears are unable to effectively handle underground rocks of varying hardness and properties when retrieving drill rods, resulting in insufficient clamping force or slippage.
A retractable retrieval spear was designed, comprising a spindle, a retrieval spearhead, an expansion mechanism, and retrieval slips. Through the cooperation of a power ring and a limiting rod, the variable expansion force of the retrieval slips is achieved, increasing the frictional resistance between the slips and the drill pipe and ensuring effective retrieval.
The variable expansion force of the retrieval slips allows for a firm grip on the drill pipe, preventing slippage and successfully retrieving the drill pipe, adapting to different geological conditions.
Smart Images
Figure CN223754051U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to geological core drilling tool technical field especially relates to a geological core drilling is with the withdrawal type fishing spear. BACKGROUND
[0002] In the geological core drilling construction process, N caliber wireline coring drilling tool is widely used because of its efficiency and convenience, however, when the drilling depth is large, the drill pipe can be broken due to bearing huge pressure and torque, in order to deal with this situation, the withdrawal type fishing spear is usually used to fish the accident drill pipe in the hole.
[0003] The internal round slip of the withdrawal type fishing spear will expand when stressed in the process of fishing the drill pipe, so as to tightly fit the drill pipe and realize fishing, however, the strength of the round slip expansion driven by the withdrawal type fishing spear is constant every time the shaft rotates, which means that the tightness of the round slip after expansion with different drill pipes is the same.
[0004] But in the actual geological drilling, the drill pipe can be damaged to different degrees when construction due to encountering different hardness and characteristics of the bottom rock, especially when the drill pipe is broken, the clamping tightness between the drill pipe and the rock will be different due to the hardness of the rock and the morphology of the fracture surface, if the clamping tightness between the drill pipe and the rock is relatively small, the withdrawal type fishing spear can usually fish out the drill pipe easily, however, when the clamping tightness between the drill pipe and the rock is large, the fishing spear may slip due to the constant expansion strength of the round slip, which can not effectively fish the drill pipe up. TECHNICAL SOLUTION
[0005] The utility model discloses in view of prior art's insufficient, provide following technical scheme: a geological core drilling is with the withdrawal type fishing spear, including the shaft core and the drill pipe, the bottom of the shaft core Rotational connection has the fishing spear head, the one end outside of the shaft core that stretches into the drill pipe interior is symmetrically set up with the expansion mechanism for the close fit of the drill pipe inner wall;
[0006] The expansion mechanism includes a bidirectional thread, the bidirectional thread is set up in the one end outside of the shaft core that stretches into the drill pipe interior, the bidirectional thread is connected with the moving ring through the thread, the outside of the moving ring is fixedly installed with the power ring, the vertical card groove is set up in the position close to the top of the outside of the power ring, the vertical card block is hingedly connected with the vertical card groove, the telescopic rod is fixedly installed at the end away from the center of the vertical card block, the fishing slip is fixedly installed at the end away from the center of the telescopic rod, the fishing slip is close to the power ring, the outside of the fishing slip is fixedly installed with the thread barb.
[0007] As the improvement of the above technical scheme, the bottom end of the fishing spear head is provided with a limiting circular hole away from the position of the center of the circle, the limiting circular hole movably inserts a limiting rod, and the top end of the limiting rod is fixedly installed with the bottom of the power circular ring.
[0008] As the improvement of the above technical scheme, the power circular ring comprises two parts of a vertical circular ring and an inclined circular ring, the vertical circular ring is located on the upper side of the inclined circular ring, and the bottom of the fishing slip is attached to the outer side of the inclined circular ring.
[0009] As the improvement of the above technical scheme, the inside of the telescopic rod is provided with a reset spring.
[0010] The beneficial effects of the utility model are as follows: after the shaft core rod drives the fishing spear head and the expansion mechanism to move downwards and insert into the drill pipe, the fishing spear head generates friction resistance with the inner wall of the drill pipe, so that the shaft core rod drives the fishing slip to expand through the cooperation of the limiting rod and the power circular ring and the like structure, the fishing slip drives the threaded barb to contact and generate friction resistance with the inner wall of the drill pipe, the shaft core rod continuously rotates to gradually increase the friction resistance between the threaded barb and the drill pipe to be greater than the clamping force between the drill pipe and the rock, the shaft core rod drives the drill pipe to rotate through the expansion mechanism, the drill pipe can be successfully fished, the expansion degree of the fishing slip is sufficient and variable, the threaded barb can firmly hold the drill pipe, the drill pipe can be effectively fished up, and the slippage is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is a front view of the utility model;
[0012] Figure 2 It is a sectional view of the internal structure of the utility model;
[0013] Figure 3 It is the utility model Figure 2 It is an enlarged view of structure A.
[0014] Reference signs: 1, shaft core rod; 11, fishing spear head; 2, drill pipe; 3, bidirectional thread; 31, moving circular ring; 32, power circular ring; 33, vertical clamping groove; 34, vertical clamping block; 35, telescopic rod; 36, fishing slip; 37, threaded barb; 4, limiting circular hole; 41, limiting rod. DETAILED DESCRIPTION
[0015] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.
[0016] Reference drawings Figure 1 , in Figure 1Fig. a is a front view, Fig. b is a right side view, the above views are only for understanding the scheme.
[0017] Please refer to Figures 1-3 The utility model provides a technical scheme: a retractable fishing spear for geological core drilling, which comprises a shaft rod 1 and a drill rod 2, the bottom end of the shaft rod 1 is rotationally connected with a fishing spear head 11, and the outer side of the end of the shaft rod 1 extending into the drill rod 2 is symmetrically provided with an expansion mechanism for closely fitting the inner wall of the drill rod 2.
[0018] The expansion mechanism comprises a bidirectional thread 3, which is arranged on the outer side of the end of the shaft rod 1 extending into the drill rod 2, and is connected with a moving ring 31 through a thread, the outer side of the moving ring 31 is fixedly installed with a power ring 32, a vertical clamping groove 33 is arranged on the outer side of the power ring 32 close to the top end, a vertical clamping block 34 is movably clamped in the vertical clamping groove 33, an extension rod 35 is fixedly installed on the end of the vertical clamping block 34 away from the center, a fishing pad 36 is fixedly installed on the end of the extension rod 35 away from the center, the fishing pad 36 is in close contact with the power ring 32, and a threaded barb 37 is fixedly installed on the outer side of the fishing pad 36.
[0019] In the embodiment, after the shaft rod 1 drives the fishing spear head 11 and the expansion mechanism to move downward and insert into the drill rod 2, the fishing spear head 11 generates frictional resistance with the inner wall of the drill rod 2, so that the shaft rod 1 drives the fishing pad 36 to expand through the cooperation of the limiting rod 41 and the power ring 32 and other structures when rotating, the fishing pad 36 drives the threaded barb 37 to come into contact with the inner wall of the drill rod 2 and generate frictional resistance, and the frictional resistance between the threaded barb 37 and the drill rod 2 gradually increases to be greater than the clamping force between the drill rod 2 and the rock when the shaft rod 1 continuously rotates, so that the shaft rod 1 drives the drill rod 2 to rotate through the expansion mechanism, and the drill rod 2 can be successfully fished.
[0020] Specifically, a limiting circular hole 4 is arranged on the bottom end of the fishing spear head 11 away from the center, and a limiting rod 41 is movably inserted into the limiting circular hole 4, and the top end of the limiting rod 41 is fixedly installed with the bottom of the power ring 32.
[0021] In the embodiment, the shaft rod 1 drives the expansion mechanism to expand under the limitation of the limiting rod 41 when rotating.
[0022] Specifically, the power ring 32 comprises a vertical ring and an inclined ring, the vertical ring is located on the upper side of the inclined ring, and the bottom of the fishing pad 36 is in close contact with the outer side of the inclined ring.
[0023] In the embodiment, when the power rings 32 on both sides move to the middle of the fishing pad 36, the fishing pad 36 is driven to expand through the inclined ring in the power ring 32.
[0024] Specifically, the inside of the telescopic rod 35 is provided with a reset spring.
[0025] In this embodiment, after the drill pipe 2 is removed, the reset spring in the telescopic rod 35 drives the fishing slip 36 to return to the original state.
[0026] In use, when the drill pipe 2 is broken and stuck in the rock during construction, the shaft rod 1 drives the fishing spear head 11 and the expansion mechanism to move downwards and insert into the drill pipe 2, at this time, the outer side of the fishing spear head 11 is in contact with the threads on the inner wall of the drill pipe 2 to generate frictional resistance, an external force drives the shaft rod 1 to rotate, the fishing spear head 11 drives the power ring 32 to remain stationary through the movable insertion of the limiting circular hole 4 and the limiting rod 41, the power ring 32 drives the moving ring 31 to remain stationary, so that the shaft rod 1 drives the moving ring 31 to move upwards when rotating, the moving ring 31 drives the power ring 32 to move upwards, the power ring 32 drives the limiting rod 41 to move upwards, and the working principle of the other power ring 32 is the same as above, the two power rings 32 move synchronously to the middle of the fishing slip 36, so as to extrude the fishing slip 36 to make it expand, the fishing slip 36 drives the vertical block 34 to move downwards along the vertical slot 33 through the telescopic rod 35, the fishing slip 36 drives the telescopic rod 35 to elongate, the fishing slip 36 drives the thread barb 37 on the outer side to move away from the center of the circle to be in contact with the threads on the inner wall of the drill pipe 2 when expanding, the thread barb 37 generates radial force, so as to bite the drill pipe 2, and the frictional resistance between the inner wall of the drill pipe 2 and the thread barb 37 is generated, if the rotating force of the shaft rod 1 on the expansion mechanism is greater than the frictional resistance between the fishing spear head 11 and the inner wall of the drill pipe 2, the shaft rod 1 drives the expansion mechanism to rotate, but because the expansion mechanism expands in advance to contact the drill pipe 2 and generate frictional resistance, the rotating force of the shaft rod 1 on the expansion mechanism is always less than the sum of the frictional resistance between the fishing spear head 11 and the inner wall of the drill pipe 2 and the frictional resistance generated by the contact between the expanded expansion mechanism and the drill pipe 2, so that the shaft rod 1 always drives the expansion mechanism to expand, and the expansion mechanism facilitates the gradual increase of the frictional resistance between the inner wall of the drill pipe 2, when the frictional resistance between the thread barb 37 and the drill pipe 2 is greater than the clamping force between the drill pipe 2 and the rock, the drill pipe 2 can be driven to rotate, at this time, the shaft rod 1 moves upwards, the shaft rod 1 drives the drill pipe 2 to move upwards through the expansion mechanism, the drill pipe 2 is successfully fished after being fixed, and the shaft rod 1 is reversely rotated to complete the fishing spear, because the expansion force of the fishing slip 36 is sufficient and variable, the thread barb 37 can firmly grasp the drill pipe 2, so as to ensure that the drill pipe 2 is effectively fished up, and the slipping situation is avoided.
[0027] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them.
Claims
1. A retractable drill spear for geological core drilling, comprising a shaft rod (1) and a drill rod (2), characterized in that: The bottom end of the shaft rod (1) is rotationally connected with a fishing spear head (11), and the outer side of the end of the shaft rod (1) extending into the drill rod (2) is symmetrically provided with an expansion mechanism for closely fitting the inner wall of the drill rod (2). The expansion mechanism comprises a bidirectional screw thread (3) which is arranged on the outer side of the end of the shaft rod (1) extending into the drill rod (2), the bidirectional screw thread (3) is threadedly connected with a moving circular ring (31), the outer side of the moving circular ring (31) is fixedly installed with a power circular ring (32), the outer side of the power circular ring (32) is provided with a vertical clamping groove (33) at a position close to the top end, the vertical clamping groove (33) is movably clamped with a vertical clamping block (34), the end of the vertical clamping block (34) away from the center of the circle is fixedly installed with an extension rod (35), the end of the extension rod (35) away from the center of the circle is fixedly installed with a fishing slip (36), the fishing slip (36) is closely fitted with the power circular ring (32), and the outer side of the fishing slip (36) is fixedly installed with a threaded barb (37).
2. A retractable fishing spear for geological core drilling according to claim 1, characterized in that: The bottom end of the fishing spear head (11) is provided with a limiting circular hole (4) at a position away from the center of the circle, the limiting circular hole (4) is movably inserted with a limiting rod (41), and the top end of the limiting rod (41) is fixedly installed with the bottom of the power circular ring (32).
3. A retractable drill spear for geological core drilling according to claim 1, characterized in that: The power circular ring (32) comprises a vertical circular ring and an inclined circular ring, the vertical circular ring is located on the upper side of the inclined circular ring, and the bottom of the fishing slip (36) is closely fitted with the outer side of the inclined circular ring.
4. A retractable drill spear for geological core drilling according to claim 1, characterized in that: The inside of the extension rod (35) is provided with a reset spring.