Laminated structure plate type fisher
By designing a laminated plate-type salvage device and utilizing a clamping plate assembly composed of an inner sleeve and a spring plate, the problem of existing salvage tools having stringent requirements on the size specifications of fish dropped downhole is solved, achieving wider applicability and higher salvage efficiency.
Patent Information
- Application Number
- CN202423034758.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-12-10
AI Technical Summary
Existing three-ball overshot devices and slip overshot tubes have strict requirements on the size specifications of fish caught in the well and have poor versatility, resulting in high production costs and low operating efficiency.
A laminated plate-type salvage device is designed, which adopts a clamping plate assembly composed of an inner sleeve and a spring plate. The spring plate is arranged in the outer sleeve in a bamboo-jointed stacking manner. The elasticity and sharp edges of the spring plate are used to enhance the clamping force and expand the scope of salvage application.
It significantly improves the hanging area and stability of fish dropped into the well, expands the scope of application of salvage, reduces production costs and maintenance difficulty, and improves the efficiency of salvage operations and oilfield production benefits.
Smart Images
Figure CN223305691U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of salvage devices, in particular to a plate-type salvage device with a stacked structure. Background Art
[0002] In oilfield drilling and production, pipe fatigue damage, eccentric wear in inclined wells, and corrosion of wellbore media often cause the sucker rod to break and fall into the well. The drill pipe or sucker rod that has fallen into the well must be salvaged. Currently, the commonly used pipe-shaped downhole fish salvage tools mainly include three-ball salvage devices and slip salvage tubes. Among them, the three-ball salvage device uses the inclined hole on the ball seat to guide the change of the size of the common inscribed circle of the three steel balls, and the steel balls are used to clamp the fish down in the well, while the slip salvage tube uses the conical surface on the tile sleeve to guide the change of the aperture of the inner hole of the slip combination, and the slips are used to lock the fish down in the well. In the salvage operation of the above two salvage tools, it is first necessary to use the fish head of the downhole fish drop to push the steel ball or slip upward. As the steel ball and the slip move upward, the common inscribed circle of the steel ball and the combined inner hole of the slip expand and increase until they are larger than the diameter of the fish head, so that the downhole fish drops into the common inscribed circle or the combined inner hole and then the salvage is completed. It can be seen that the three-ball salvage device is only suitable for salvaging downhole fish whose maximum diameter of the fish head is smaller than the inner hole diameter of the lower end of the ball seat but larger than the common inscribed circle diameter of the steel ball in the initial state, and the slip salvage tube is only suitable for salvaging downhole fish whose maximum diameter of the fish head is smaller than the inner hole diameter of the lower end of the tile sleeve but larger than the inner hole diameter of the combined slip sleeve in the initial state. Both have very strict requirements on the size specifications of the fish head of the downhole fish drop, and have poor versatility. They need to be matched according to the specification series in production, which increases the investment cost. Moreover, since the matching structure between the steel ball and the ball seat, and the slip and the tile sleeve is relatively complex and occupies a large space, a large amount of processing must be carried out for fish heads of larger sizes, further increasing the operation cost and reducing the operation efficiency. Therefore, it is necessary to further research and develop new types of pipe-rod-shaped downhole fish salvage tools, enrich the supporting series of pipe-rod-shaped downhole fish salvage tools, improve the efficiency of salvage operations, and reduce production cost investment. Utility Model Content
[0003] The purpose of the utility model is to provide a laminated plate type salvage device, simplify the product design structure, expand the applicable scope of salvage, reduce the production and maintenance costs, and improve the production efficiency of oil fields.
[0004] A stacked structure plate salvage device, comprising: an upper joint, an outer sleeve, a sleeve milling head and a clamping plate assembly; the lower end of the upper joint and the upper end of the sleeve milling head are respectively provided with connecting external threads, and the two ends of the outer sleeve are respectively provided with connecting internal threads corresponding to the connecting external thread structure, and the upper joint, the outer sleeve and the sleeve milling head are sequentially connected to each other by threaded cooperation with each other to form a salvage device body. In the salvage device body, the inner cavity aperture of the outer sleeve is respectively larger than the inner cavity aperture of the upper joint and the sleeve milling head, so that the lower end surface of the upper joint and the upper end surface of the sleeve milling head respectively form limiting shoulders at both ends of the inner cavity of the outer sleeve, and at the same time, the upper end of the upper joint is provided with a mechanical A connecting structure for connecting the overshot body to the drill pipe of the drilling tool; the clamping plate assembly is composed of an inner sleeve and a spring plate. The inner sleeve is a circular cylinder, and the outer circumference diameter corresponds to the inner cavity aperture of the outer sleeve, and can be cooperatively embedded in the inner cavity of the outer sleeve. The spring plate is an elastic structure, which is distributed along the circumference of the same cross section of the inner sleeve, with one end fixedly connected to the side wall of the inner sleeve, and the other end extending axially in the same direction and at the same time inclined radially toward the axis of the inner sleeve. The clamping plate assembly is cooperatively embedded in the inner cavity of the outer sleeve in a bamboo-joint stacking manner, and its two ends are respectively constrained and limited by the lower end face of the upper joint and the upper end face of the sleeve milling head.
[0005] In the described stacked plate-type salvage device, the clamping plate assembly is preferably arranged in an inner cavity of the outer sleeve in the circumferential direction with equal angles of rotation and staggered arrangement, so that the spring plates on adjacent clamping plate assemblies are staggered with each other in the axial direction, thereby improving the stability of the fish caught in the well.
[0006] In the described laminated plate-type salvage device, the clamping plate assembly is preferably arranged in the same spatial orientation in the circumferential direction within the inner cavity of the outer sleeve, so that the spring plates on the clamping plate assembly are respectively located in the same axial direction, thereby enhancing the firmness of the downhole fish hook.
[0007] The stacked plate-type salvage device is preferably stacked with a buffer space of height H between the clamping plate assembly at the uppermost end of the outer sleeve and the upper joint, and a buffer spring is installed in the buffer space. The buffer spring is supported between the clamping plate assembly and the upper joint to provide a protective buffer space and buffering force for the impact of the fish falling in the well on the clamping plate assembly during the salvage operation, thereby preventing damage to the component parts and ensuring the stability of the coordinated action of the component parts.
[0008] The stacked plate-type salvage device is preferably provided with a sharp edge on the end of the spring plate extending obliquely toward the axis of the inner sleeve, thereby enhancing the blocking function of the spring plate on the fish falling in the well and increasing the frictional resistance acting in the reverse direction with the fish falling in the well.
[0009] The beneficial effect of the present invention is to provide a laminated plate-type salvage device, which salvages fish in the well by means of a clamping and hanging method using spring plates regularly distributed in an outer sleeve. Since the inner sleeve is a straight cylinder structure, the combined inner cavity can accommodate the fish in the well over the entire length and diameter of the cylinder. Not only can it significantly increase the clamping and hanging effect area with the fish in the well, ensure the clamping strength of the fish in the well, and improve the salvage effect, but it can also significantly expand the applicable range of salvaging radial size specifications of fish in the well. It has good production compatibility and a wide range of specifications. It can form functional matching and complementary advantages with the currently used traditional salvage tools, enrich the matching series of pipe-rod-shaped fish salvage tools, reduce production investment, and improve production efficiency. In particular, the integrated clamping plate assembly is used as the basic component, and the spring plates are arranged in the outer sleeve in a bamboo-joint stacking manner, which can significantly simplify the design structure, facilitate manufacturing, assembly, repair and maintenance, and effectively reduce the production and use maintenance costs during production and application, thereby improving the efficiency of salvage operations and the production benefits of oil fields. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a cross-sectional view of the structure of the combined structure plate-type salvage device in Example 1.
[0011] Figure 2 for Figure 1 Cross-sectional view of the middle AA section.
[0012] Figure 3 for Figure 1 A partial enlarged view of point Ⅰ in the middle.
[0013] Figure 4 This is a cross-sectional view of the structure of the combined structure plate-type salvage device in Example 2.
[0014] Figure 5 for Figure 4 Cross-sectional view of the middle BB section. DETAILED DESCRIPTION
[0015] Furthermore, the technical solution claimed for protection of the present utility model is described in detail in conjunction with specific embodiments and the accompanying drawings. Example 1
[0016] A laminated plate type salvage device, such as Figure 1 and Figure 2As shown, it consists of an upper joint 1, an outer sleeve 2, a sleeve milling head 3, a clamping plate assembly and a buffer spring 6; the upper end of the upper joint 1 is provided with a connecting internal thread, and the lower end is provided with a connecting external thread, the upper end of the sleeve milling head 3 is provided with a connecting external thread, and the upper and lower ends of the outer sleeve 2 are respectively provided with connecting internal threads corresponding to the connecting external thread structures on the upper joint 1 and the sleeve milling head 3. The upper joint 1, the outer sleeve 2 and the sleeve milling head 3 are threadedly matched with each other and sequentially connected to form a salvage device body. In the salvage body, the inner cavity aperture of the outer sleeve 2 is larger than the inner cavity of the upper joint 1 and the sleeve milling head 3. The aperture is such that the lower end surface of the upper joint 1 and the upper end surface of the sleeve milling head 3 correspond to each other to form the limit shoulders at both ends of the inner cavity of the outer sleeve 2; the clamping plate assembly is composed of an inner sleeve 4 and a spring plate 5, and three evenly distributed strip windows are provided on the circumference of the same horizontal section of the inner sleeve 4. The spring plate 5 is made of spring steel and is a long, bent flat plate structure. The three spring plates 5 are respectively arranged in correspondence with the strip windows, and the lower end bolts are connected to the lower part of the strip window on the outside of the inner sleeve 4, and the upper end is bent inward and extends obliquely from the corresponding strip window into the inner cavity of the inner sleeve 4, such as Figure 3 As shown, a sharp edge 10 is provided on the end head. When the spring plate 5 is fully bent outward by an external force, the upper end plate body of the spring plate 5 can be embedded in the strip window as a whole; the 5-section clamping plate assembly is embedded in the inner cavity of the outer sleeve 2 in a bamboo-section stacking manner, and the two ends are respectively constrained and limited by the upper joint 1 and the sleeve milling head 3. The adjacent clamping plate assemblies are arranged at a corresponding 30° angle in the circumferential direction, so that the spring plate 5 can be combined in the axial direction to form 6 fish-falling hanging action lines, thereby enhancing the balance of the force applied by the fish-falling hanging action lines to the fish in the outer circumferential direction in the salvage state, and improving the stability of the fish-falling hanging action lines.
[0017] When using the stacked plate-type salvage device described in this embodiment to salvage a rod-shaped downhole fish, it is only necessary to connect the salvage device body to the drill pipe of the drilling tool using the connecting internal thread at the upper end of the upper joint 1 and send it down the well along with the drill pipe of the drilling tool. After reaching the downhole fish salvage position, the drill pipe of the drilling tool is rotated to trim the fish head using the sleeve milling head 3 and then guide the downhole fish into the sleeve milling head 3, and continue to send the drilling tool drill pipe down so that the downhole fish passes through the sleeve milling head 3 and extends into the inner cavity of the inner sleeve 4 in the stacked outer sleeve 2 in sequence until the downhole fish rod body reaches the maximum length that can be extended into the outer sleeve 2. During this process, the downhole fish moves forward relative to the spring plate 5 installed on the inner sleeve 4, and can push the spring plate 5 in the radial direction during the movement to make it move forward. The outer side produces elastic bending deformation and at the same time maintains applying elastic force to the fish falling in the well. During this process, the buffer spring 6 can effectively alleviate the impact of the fish falling in the well on the clamping plate assembly. Subsequently, the drill rod of the drilling tool is lifted. Since the fish falling in the well is converted into a reverse movement relative to the spring plate 5 during the lifting process and the front end of the spring plate 5 is provided with a sharp edge 10, the corresponding spring plates 5 interact with each other to produce a large friction resistance to the fish falling in the well. At the same time, since the fish falling in the well extends into the outer sleeve 2 for a long length and the effective area of interaction with the spring plate 5 is large, the clamping force of the clamping plate assembly on the fish falling in the well can overcome the self-gravity of the fish falling in the well and its unblocking resistance to salvage the fish falling in the well.
[0018] The stacked plate-type salvage device described in this embodiment adopts an arrangement in which adjacent clamping plate assemblies are staggered at an angle of 30° in the circumferential direction. The spring plates 5 can be combined in the axial direction to form 6 fish-dropping clamping action lines that jointly and balancedly act on the fish dropped in the well. Therefore, it is relatively more suitable for salvaging fish in the well with a relatively rough surface and a relatively large friction coefficient. It can enhance the stability of the clamping and hanging fish and further improve the salvage effect. Example 2
[0019] A laminated plate type salvage device, such as Figure 4 and Figure 5 As shown, it consists of an upper joint 1, an outer sleeve 2, a sleeve milling head 3, a clamping plate assembly and a buffer spring 6; the upper joint 1, the outer sleeve 2 and the sleeve milling head 3 are threadedly matched with each other and sequentially connected to form a salvage body. In the salvage body, the inner cavity aperture of the outer sleeve 2 is larger than the inner cavity aperture of the upper joint 1 and the sleeve milling head 3, so that the lower end surface of the upper joint 1 and the upper end surface of the sleeve milling head 3 correspond to each other to form limiting shoulders at both ends of the inner cavity of the outer sleeve 2; the clamping plate assembly is composed of an inner sleeve 4 and a spring plate 5, as shown Figure 3As shown, a sharp edge 10 is provided on the end of the spring plate 5, and the five clamping plate assemblies are embedded in the inner cavity of the outer sleeve 2 in a bamboo-jointed stacking manner, and the two ends are respectively constrained and limited by the upper joint 1 and the sleeve milling head 3. Each of the clamping plate assemblies is arranged in the same spatial orientation in the circumferential direction, so that the spring plates 5 correspond to each other in the axial direction to form three fish-dropping clamping action lines, thereby maximizing the number of the spring plates 5 on each of the fish-dropping clamping action lines and enhancing the firmness of the fish-dropping clamping action lines to the downhole fish-dropping clamp.
[0020] The method of using the stacked plate-type salvage device described in this embodiment is exactly the same as that in Example 1. However, since this embodiment adopts a method in which the clamping plate assemblies are stacked in the same spatial orientation in the circumferential direction, each fish-dropping clamping action line has a maximized clamping strength for the fish dropped in the well. Therefore, it is relatively more suitable for salvaging fish in the well with a relatively smooth surface and a relatively small friction coefficient, which can enhance the reliability of the clamping and dropping of fish and ensure the salvage effect.
Claims
1. A laminated plate-type salvage, characterized in that: include: An upper joint (1), an outer sleeve (2), a sleeve milling head (3) and a clamping plate assembly; the lower end of the upper joint (1) and the upper end of the sleeve milling head (3) are respectively provided with connecting external threads, and the two ends of the outer sleeve (2) are respectively provided with connecting internal threads corresponding to the connecting external threads. The upper joint (1), the outer sleeve (2) and the sleeve milling head (3) are sequentially connected to each other by means of mutual thread cooperation to form a salvage device body. In the salvage device body, the inner cavity aperture of the outer sleeve (2) is respectively larger than the inner cavity aperture of the upper joint (1) and the sleeve milling head (3), so that the lower end surface of the upper joint (1) and the upper end surface of the sleeve milling head (3) respectively form limiting shoulders at the two ends of the inner cavity of the outer sleeve (2). At the same time, the upper joint (1) The upper end of the sleeve is provided with a mechanical connection structure; the card assembly is composed of an inner sleeve (4) and a spring plate (5), the inner sleeve (4) is a circular cylinder, the outer circumference diameter corresponds to the inner cavity aperture of the outer sleeve (2), and can be inserted in the inner cavity of the outer sleeve (2); the spring plate (5) is an elastic structure, which is distributed along the same cross-section circumference of the inner sleeve (4), one end of which is fixedly connected to the side wall of the inner sleeve (4), and the other end of which extends in the same direction along the axial direction and is inclined radially toward the axis of the inner sleeve (4). The card assembly is inserted in the inner cavity of the outer sleeve (2) in a bamboo-joint stacking manner, and its two ends are respectively constrained and limited by the lower end face of the upper joint (1) and the upper end face of the sleeve milling head (3).
2. The laminated plate-type overshot according to claim 1, characterized in that: The clamping plate assemblies are arranged in the inner cavity of the outer sleeve (2) in a circumferential direction in sequence and rotated at equal angles, so that the spring plates (5) on adjacent clamping plate assemblies are staggered in the axial direction.
3. The laminated plate-type overshot according to claim 1, characterized in that: The clamping plate assembly is arranged in the same spatial orientation in the circumferential direction within the inner cavity of the outer sleeve (2), so that the spring plates (5) on the clamping plate assembly are respectively located in the same axial direction.
4. A laminated plate-type overshot according to any one of claims 1 to 3, characterized in that: A buffer space with a height of H is provided between the uppermost clamping plate assembly stacked in the outer sleeve (2) and the upper joint (1), and a buffer spring (6) is installed in the buffer space, and the buffer spring (6) is supported between the clamping plate assembly and the upper joint (1).
5. The laminated plate-type overshot according to claim 4, characterized in that: A sharp edge (10) is provided on the end of the spring plate (5) extending obliquely toward the axis of the inner sleeve (4).