Fishing spear with telescopic function
By designing a telescopic retrieval spear and utilizing a combination of slips, connecting sleeves, limiting sleeves, and springs, the problem of the spear's single function was solved, achieving convenience and cost savings in oil pipe retrieval and backing.
Patent Information
- Application Number
- CN202520747864.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-04-21
AI Technical Summary
The existing retrieval spears have a single function, which means that different retrieval spears are needed when retrieving or inverting oil pipes, increasing the cost of use.
A telescopic retrieval spear was designed. By setting a combination structure of slips, connecting sleeve, limiting sleeve, spring and pin on the spear shaft, the slips can enter the inner cavity of the oil pipe and rotate under the action of the oil pipe, so as to realize the retrieval and overturning operation of the oil pipe.
It facilitates the retrieval and reverse-clamping operations of the retrieval spear in horizontal wells, and reduces retrieval costs.
Smart Images
Figure CN223839085U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spear-retrieving equipment technology, specifically a spear-retrieving device with telescopic function. Background Technology
[0002] A retrieval spear is a downhole tool mainly used for retrieving objects with internal holes, such as drill pipes, tubing, casing, liners, packers, and water distributors. Retrieving spears are widely used in various downhole operation scenarios, especially when it is necessary to retrieve objects with internal holes, where they demonstrate unique advantages. Different types of retrieval spears are suitable for different types of objects and operational needs, ensuring the efficiency and safety of downhole operations.
[0003] However, existing retrieval spears have a single function, so different retrieval spears are needed when it is necessary to retrieve or reverse oil pipes, which increases the user's operating costs. Therefore, we propose a retrieval spear with telescopic function to solve the above-mentioned problems. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a telescopic spear, which solves the problem of limited functionality, requiring different spears for retrieving or inverting oil pipes, thus increasing user costs.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a telescopic spear, comprising a spear shaft, a locking plate sleeved on the upper part of the spear shaft near the head, a connecting sleeve sleeved on the upper part of the spear shaft near the end, a limiting sleeve provided in the inner cavity of the connecting sleeve, the limiting sleeve being sleeved on the end of the spear shaft, and a spring sleeved in the middle of the spear shaft, the two ends of the spring being connected to the locking plate and the connecting sleeve respectively;
[0006] One end of the connecting sleeve is connected to a connector, the outer wall of the connector is provided with a pin hole, a pin is inserted into the inner cavity of the pin hole, and the bottom end of the pin is engaged with the outer wall of the connecting sleeve.
[0007] Preferably, the rear end face of the chuck has a stepped hole.
[0008] Preferably, the pin is made of copper.
[0009] Preferably, the inner diameter of the spring is larger than the outer diameter of the middle part of the spear shaft, and the outer diameter of the spring is smaller than the outer diameter of one end of the slip.
[0010] Preferably, one end of the connecting sleeve is inserted into the inner cavity of one end of the connector.
[0011] Beneficial effects
[0012] This invention provides a telescopic spear. Compared with the prior art, it has the following advantages:
[0013] This telescopic spear has a step on the rear end of the slip that is larger than the diameter of the inner cavity of the oil pipe, allowing the slip to enter the inner cavity of the oil pipe. When the slip step hits the oil pipe, the compression spring pushes the slip upward, disengaging the spear rod's inverted stop key. At this point, rotating the spear rod by ⅓ or ¼ turn will prevent the slip from rotating due to the force of the oil pipe. The inverted stop key will then rotate away from the slip groove, blocking the slip from moving downward. Lifting the spear will cause the slip to retract under the action of the inverted stop key. Continuing to lift will safely remove the spear. A pin prevents the connecting sleeve from falling off the joint. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model.
[0015] In the diagram: 1. Connector; 2. Spear rod; 3. Slip; 4. Connecting sleeve; 5. Limiting sleeve; 6. Spring; 7. Pin. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figure 1 This utility model provides a technical solution: a telescopic spear, including a spear shaft 2, a slip 3 sleeved on the upper part of the spear shaft 2 near the head, a connecting sleeve 4 sleeved on the upper part of the spear shaft 2 near the end, a limiting sleeve 5 provided in the inner cavity of the connecting sleeve 4, the limiting sleeve 5 sleeved on the end of the spear shaft 2, a spring 6 sleeved in the middle of the spear shaft 2, the two ends of the spring 6 being connected to the slip 3 and the connecting sleeve 4 respectively; a connector 1 is inserted into one end of the connecting sleeve 4, a pin hole is provided on the outer wall of the connector 1, a pin 7 is inserted into the inner cavity of the pin hole, and the bottom end of the pin 7 is engaged with the outer wall of the connecting sleeve 4; a stepped hole is opened on the rear end face of the slip 3;
[0018] Because the rear end face of the slip 3 has a step larger than the inner diameter of the oil pipe, the slip 3 can enter the inner cavity of the oil pipe. When the step of the slip 3 hits the oil pipe, the compression spring 6 slides upward against the slip 3, disengaging the inverted stop key of the spear rod 2. At this time, rotating the spear rod 2 by ⅓ or ¼ turn will prevent the slip 3 from rotating due to the force of the oil pipe. The inverted stop key of the spear rod 2 will just turn away from the slot of the slip 3 to block the slip 3 from going down. When the spear is lifted, the slip 3 will retract under the action of the inverted stop key of the spear rod 2. Continuing to lift can safely remove the spear. The pin 7 can prevent the connecting sleeve 4 from falling off the joint 1.
[0019] See Figure 1 The pin 7 is made of copper, which can improve the service life of the pin 7.
[0020] See Figure 1 The inner diameter of spring 6 is larger than the outer diameter of the middle part of spear 2, and the outer diameter of spring 6 is smaller than the outer diameter of one end of slip 3, which allows spring 6 to extend and retract flexibly, thereby providing elastic force to slip 3.
[0021] See Figure 1 One end of the connecting sleeve 4 is inserted into the inner cavity of one end of the connector 1, so that the connecting sleeve 4 can be installed in the inner cavity of the connector 1.
[0022] During operation, after the retrieval spear is lowered into the well, the slip 3 remains at the front end of the spear shaft 2 under the pressure of the spring 6. When it reaches the top of the fish, the slip 3 enters the inner cavity of the top of the fish. At this time, the retrieval spear is lifted, and the fish is pulled out by inverting the handle. If the lifting of the fish is obstructed, or if the fish cannot be pulled out by inverting the handle, the tubing string is lowered, the top of the fish presses against the tail step of the slip 3, compresses the spring 6, and the slip 3 disengages from the inverted stop block. The spear shaft 2 is rotated ⅓ or ¼ turn to lift the spear shaft 2 out of the top of the fish. The entire retrieval spear can be conveniently used to retrieve tubing and inverted tubing in horizontal wells, saving retrieval costs.
[0023] In summary, this device can be conveniently used for retrieving tubing and reversed tubing in horizontal wells, saving retrieval costs.
[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
Claims
1. A telescopic spear, characterized in that: Includes a spear shaft (2), a slip (3) is sleeved on the upper part of the spear shaft (2) near the head, a connecting sleeve (4) is sleeved on the upper part of the spear shaft (2) near the end, a limiting sleeve (5) is provided in the inner cavity of the connecting sleeve (4), the limiting sleeve (5) is sleeved on the end of the spear shaft (2), and a spring (6) is sleeved on the middle part of the spear shaft (2), the two ends of the spring (6) are respectively connected to the slip (3) and the connecting sleeve (4); One end of the connecting sleeve (4) is connected to a connector (1), the outer wall of the connector (1) is provided with a pin hole, a pin (7) is inserted into the inner cavity of the pin hole, and the bottom end of the pin (7) is engaged with the outer wall of the connecting sleeve (4).
2. The telescopic spear according to claim 1, characterized in that: The rear end face of the kava (3) has a stepped hole.
3. A telescopic spear according to claim 1, characterized in that: The pin (7) is made of copper.
4. A telescopic spear according to claim 1, characterized in that: The inner diameter of the spring (6) is greater than the outer diameter of the middle part of the spear (2), and the outer diameter of the spring (6) is smaller than the outer diameter of one end of the slip (3).
5. A telescopic spear according to claim 1, characterized in that: One end of the connecting sleeve (4) is inserted into the inner cavity of one end of the connector (1).