A strong magnetic fishing and milling combined device suitable for horizontal wells

Abstract

The application discloses a strong magnetic fishing and milling combined device suitable for horizontal wells, which comprises a fishing body, a connecting head at the front of the fishing body, a double-side concave arc fishing groove structure at the tail of the fishing body, a first arc fishing groove and a second arc fishing groove, a fishing magnetic component arranged in the middle of the first arc fishing groove and the second arc fishing groove, a milling component arranged at the tail of the fishing body, arc magnetic steel of the fishing magnetic component, and multiple short-size arc magnetic steels arranged on the fishing body, wherein the multiple short-size arc magnetic steels are arranged to avoid breakage of the arc magnetic steel due to overlength. The application integrates the fishing, milling and fishing in one, has large fishing capacity, has wide coverage of the strong magnet through the ingenious design, realizes all-directional fishing of the fallen objects, and completely fishes the fallen objects without the need of secondary fishing through the tool.

Description

Technical Field

[0001] This invention relates to the field of retrieval of fallen objects and milling technology in well workover operations, specifically a combined strong magnetic retrieval and milling device suitable for horizontal wells. Background Technology

[0002] Currently, well workover operations typically involve milling followed by retrieval, requiring two drilling trips, each lasting dozens of hours, which is extremely time-consuming. The tools used are limited in function and structure, with most being semi-open magnetic retrieval devices. When retrieving small iron objects such as tool fragments, pliers, slips, hand tools, tubing or casing debris left after well workover and drilling operations, incomplete retrieval is often encountered. Existing tools have a small retrieval range and capacity, requiring multiple retrieval cycles, which consumes a lot of manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to provide a combined strong magnetic retrieval milling and grinding device suitable for horizontal wells. This device integrates milling and retrieval into one unit, with a large retrieval capacity. Through ingenious design, the strong magnet has a wide coverage area, enabling all-round retrieval of fallen objects. The retrieval is thorough and does not require secondary retrieval with tools, thus overcoming the defects and deficiencies mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a combined strong magnetic fishing and milling device suitable for horizontal wells, comprising a fishing body;

[0005] The front part of the salvage body is a connector, and the connector is provided with a connecting threaded hole groove coaxial with the salvage body.

[0006] The tail section of the salvage body is a double-sided concave arc-shaped salvage groove structure, namely a first arc-shaped salvage groove and a second arc-shaped salvage groove; salvage magnetic components are provided in the middle of both the first arc-shaped salvage groove and the tail section of the salvage body is provided with milling components.

[0007] The salvage magnetic component is an arc-shaped magnet. The arc-shaped magnet located on the salvage body is divided into multiple short arc-shaped magnets. The multiple short arc-shaped magnets are set to prevent the arc-shaped magnets from breaking due to being too long.

[0008] As a further aspect of the present invention: a water-hole is provided in the salvage body parallel to the salvage body. The water-hole connects from the connecting threaded hole to the end face of the milling component, so that water can be directly injected from the outside into the tail end of the salvage body through the water-hole. This achieves both rinsing the milling component and circulating the magnetic debris after milling to the salvage magnetic component where it is attracted by the arc-shaped magnet. Non-magnetic debris is discharged from the well to the surface along with the water.

[0009] As a further aspect of the present invention: A magnetic spacer ring is provided on the arc-shaped side of the single short-sized arc-shaped magnet. The magnetic spacer ring closest to the milling component is welded and fixed to the retrieval body. The remaining magnetic spacer rings are interlocked. The welded magnetic spacer rings can limit and fix the lower end of the arc-shaped magnet, while the interlocked magnetic spacer rings are used to clamp and fix the arc-shaped magnet, and facilitate the disassembly of the arc-shaped magnet later. A magnetic pressure plate is provided on the straight side of the arc-shaped magnet. The magnetic pressure plate and the magnetic spacer rings achieve the limiting and fixing of the corresponding single short-sized arc-shaped magnet.

[0010] As a further aspect of the present invention: the cross-section of the magnetic steel pressure plate is an L-shaped structure, which can not only ensure that both sides are tightly attached to the concave arc surface of the retrieval body, but also fix the arc surface magnet and the magnetic steel spacer ring.

[0011] As a further aspect of the present invention: the curvature of the arc-shaped magnet is consistent with the curvature of the retrieval groove at the tail of the retrieval body; the arc-shaped magnet is pressed and fixed to the groove surface of the corresponding arc-shaped retrieval groove by a magnet pressure plate.

[0012] As a further aspect of the present invention: a limiting structure is correspondingly provided on the retrieval body at the front end of the retrieval magnetic component. The limiting structure limits the retrieval magnetic component, prevents axial movement of the retrieval magnetic component, and facilitates the replacement of the retrieval magnetic component. The cooperation between the limiting structure and the welded magnetic spacer ring can achieve overall limiting of the positions of both ends of the retrieval magnetic component.

[0013] As a further aspect of the present invention: the limiting seat structure is a block structure with one side being a flat surface and the other side being a convex arc surface, and a fixing hole is provided on the limiting seat structure; the limiting seat structure is fixed to the salvage body by passing a set screw through the fixing hole.

[0014] As a further aspect of the present invention: the milling component is a carbide milling head; the milling head of the carbide milling head has a double-blade shape structure, an alloy layer is provided on one side of the blade to form a grinding edge, and a carbide layer of the same material as the blade is provided at the front end of the milling head, so as to realize milling in all directions.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the present invention can better complete the retrieval of milling debris and fallen objects in well workover operations, and has the following beneficial effects compared with other strong magnetic retrieval tools:

[0016] 1. The combined design cleverly integrates strong magnetic retrieval with milling. The end of the strong magnetic retrieval body is equipped with a carbide milling head, which reduces drilling time, improves operational efficiency, and lowers well workover costs.

[0017] 2. Novel structure and large salvage capacity: The tool has arc-shaped grooves on both sides, and each groove is equipped with a strong magnet. The strong magnets have a wide coverage area, enabling all-round salvage. Each side is equipped with 4 arc-shaped magnets, which can salvage debris more thoroughly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 for Figure 1 Overall sectional view;

[0021] Figure 3 for Figure 1 The main view;

[0022] Figure 4 for Figure 2 Sectional view of AA;

[0023] Figure 5 for Figure 2 BB section view;

[0024] Figure 6 for Figure 3 CC section view;

[0025] Figure 7 for Figure 3 DD section view;

[0026] Figure 8 for Figure 3 EE section view;

[0027] Figure 9 for Figure 3 FF section view;

[0028] Figure 10 for Figure 3 G-direction view.

[0029] In the diagram: 1. Salvage body; 2. Limiting seat structure; 3. Arc-shaped magnet; 4. Magnet spacer ring; 5. Magnet pressure plate; 6. Carbide milling head; 7. Connecting threaded hole groove; 8. Double blade shape structure; 9. Set screw; 10. First arc-shaped salvage groove; 11. Second arc-shaped salvage groove; 12. Slot; 13. Water eye through hole. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-10 This embodiment provides a technical solution: a combined strong magnetic fishing and milling device suitable for horizontal wells, including a fishing body 1;

[0032] The front part of the salvage body 1 is a connector, and the connector is provided with a connecting threaded hole 7 coaxial with the salvage body 1; the rear part of the salvage body 1 is provided with a salvage magnetic component and a milling component, and a limiting seat structure 2 is provided between the front part of the salvage body 1 and the salvage magnetic component; the main body of the rear part of the salvage body 1 is a double-sided concave arc surface salvage groove structure, namely a first arc surface salvage groove 10 and a second arc surface salvage groove 11; both the first arc surface salvage groove 10 and the second arc surface salvage groove 11 are provided with a limiting seat structure 2, a salvage magnetic component and a milling component. The milling component is a carbide milling head 6 fixedly connected to the tail end of the salvage body 1. A water eye through hole 13 parallel to the salvage body 1 is provided inside the salvage body 1. The water eye through hole 13 is connected from the connecting threaded slot 7 to the end face of the carbide milling head 6, so that water can be directly injected from the outside into the tail end of the salvage body 1 through the water eye through hole 13. This achieves both flushing of the carbide milling head 6 and circulation of the milled magnetic debris to the salvage magnetic component where it is attracted by the arc-shaped magnet. Non-magnetic debris is discharged from the well to the surface along with the water.

[0033] The retrieval magnetic component consists of multiple short-sized arc-shaped magnets 3 on a single-arc retrieval groove, magnetic spacer rings 4 between adjacent short-sized arc-shaped magnets 3, and magnetic pressure plates 5. The last magnetic spacer ring 4 near the milling component end is welded and fixed to the retrieval body 1. The multiple short-sized arc-shaped magnets 3 are used to prevent breakage due to excessive length. The magnetic pressure plate 5 has an L-shaped cross-section 12, which allows it to be tightly attached to the concave arc-shaped retrieval groove surface of the retrieval body 1 on both sides, and also to fix the arc-shaped magnets 3 and magnetic spacer rings 4. The arc-shaped magnets 3... The curvature of the arc surface is consistent with that of the retrieval trough; the arc surface magnet 3 is pressed and welded to the trough surface of the corresponding arc surface retrieval trough after being pressed by the magnet pressure plate 5; the limiting seat structure 2 is a block structure with four fixing holes on one side of the arc surface and one side of the flat surface. Its arc surface matches the arc of the first arc surface retrieval trough 10 or the arc of the second arc surface retrieval trough 11. It is fixed to the retrieval body 1 by four set screws 9 to limit the retrieval magnetic component and prevent the axial movement of the arc surface magnet 3 and the magnet spacer ring 4 in the retrieval magnetic component. At the same time, it is convenient to replace the arc surface magnet 3 and the magnet spacer ring 4 after removing the limiting seat structure 2.

[0034] The carbide milling head 6 has a double-blade structure 8 at the milling head part. An alloy layer is provided on one side of the blade to form a grinding edge. The front end of the milling head is provided with a carbide layer of the same material as the blade, so as to realize milling in all directions.

[0035] Working principle of this embodiment:

[0036] In this embodiment, the upper part is connected to the drill pipe via a connecting thread. The rotation of the drill pipe drives the tool to rotate. The lower part of the tool is welded with a carbide milling head. The rotation of the carbide head mills the casing both on the end face and in the circumferential direction, grinding the casing into fine iron filings. The tool has two water holes inside. The mud circulates through the water holes to wash the ground area, circulating the fine iron filings to the retrieval magnetic component where they are attracted by the arc-shaped magnet. Non-magnetic debris is discharged from the well to the surface along with the water.

[0037] like Figure 2 , Figure 3As shown, this embodiment has a connecting threaded slot 7 at the upper end, which can be used to connect the retrieval body to well repair, drilling, or retrieval operations, or it can be used alone; the tool end has a carbide milling head 6, which is set as a double-blade shape structure 6. One side of the blade is provided with an alloy layer to form a grinding edge, and the front end of the milling head is provided with an alloy layer that is the same as the combination of the blade and the grinding edge. In this embodiment, milling can be performed in all directions when rotated; the set screw 9 is mainly used to fix the limiting seat on the retrieval body in the whole device, so that the limiting seat plays a limiting role and prevents the arc surface magnet from moving; the middle part of the device is designed as a double-sided concave arc surface retrieval groove, which is provided with a first arc surface retrieval groove 10 and a second arc surface retrieval groove 11 respectively. After the magnet is installed, the retrieval groove forms a large adsorption capacity space, which can accommodate larger-sized objects and has more retrieval volume, so more iron filings can be retrieved. The device consists of a total of 8 arc-shaped magnets 3. Four arc-shaped magnets 3 are installed in each of the first arc-shaped retrieval groove 10 and the second arc-shaped retrieval groove 11. An L-shaped structure 12 is provided at the magnet pressure plate 5 for clamping the arc-shaped magnets 3. After clamping the arc-shaped magnets 3 with the L-shaped structure 12, they are welded to the retrieval body. Since excessively long magnets are prone to breakage during installation, the arc-shaped magnets are designed with shorter dimensions and divided into multiple pieces. These multiple pieces are combined and installed, with magnetic spacer rings 4 separating and connecting them. A total of 8 magnetic spacer rings are provided. The retrieval body is equipped with water-permeable holes 13. The double water-permeable holes provide better flow, allowing for the circulation of water through the holes to flush the grinding area. The smaller water-permeable holes create a larger pressure difference, resulting in greater impact force and more thorough flushing of bottom debris.

[0038] The device provided in this embodiment integrates milling and retrieval, and has a large retrieval capacity, capable of milling 50 meters of casing at a time. Through ingenious design, the strong magnet has a wide coverage area, enabling all-round retrieval of falling objects. The retrieval is thorough and does not require secondary retrieval with tools, saving a lot of time and costs.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined magnetic retrieval and milling device for horizontal wells, comprising a retrieval body (1), characterized in that: The front part of the salvage body (1) is a connector, and the connector is provided with a connecting threaded groove (7) that is coaxial with the salvage body (1). The tail of the salvage body (1) is a double-sided concave arc-shaped salvage groove structure, namely a first arc-shaped salvage groove (10) and a second arc-shaped salvage groove (11); salvage magnetic components are provided in the middle of the first arc-shaped salvage groove (10) and the second arc-shaped salvage groove (11), and a milling component is provided at the tail of the salvage body (1). The salvage magnetic component is an arc-shaped magnet (3). The arc-shaped magnet (3) located on the salvage body (1) is divided into multiple short-sized arc-shaped magnets (3). Multiple short-sized arc-shaped magnets (3) are set to avoid the arc-shaped magnets (3) from breaking due to excessive length. A water eye through hole (13) parallel to the salvage body (1) is provided inside the salvage body (1). The water eye through hole (13) is connected from the connecting threaded hole groove (7) to the end face of the milling component, so that water can be directly injected from the outside into the tail end of the salvage body (1) through the water eye through hole (13), so as to both flush the milling component and allow the magnetic debris after milling to be circulated to the salvage magnetic component and attracted by the arc surface magnet (3). The non-magnetic debris is discharged from the well surface along with the water. A magnetic spacer ring (4) is provided on the arc-shaped side of a single short-sized arc-shaped magnetic steel (3), wherein the magnetic spacer ring (4) closest to the milling component is welded and fixed to the retrieval body (1); a magnetic pressure plate (5) is provided on the straight side of the arc-shaped magnetic steel (3); the magnetic pressure plate (5) and the magnetic spacer ring (4) are used to limit and fix the corresponding single short-sized arc-shaped magnetic steel (3); The milling component is a carbide milling head (6); the milling head part of the carbide milling head (6) has a double-blade shape structure (8), one side of the blade is provided with an alloy layer to form a grinding edge, and the front end of the milling head is provided with a carbide layer of the same material as the blade, so as to realize milling in all directions.

2. The combined strong magnetic fishing and milling device for horizontal wells according to claim 1, characterized in that: The cross-section of the magnetic steel pressure plate (5) is an L-shaped structure (12), which can not only tightly attach both sides to the concave arc surface of the retrieval body (1), but also fix the arc surface magnet (3) and the magnetic steel spacer ring (4).

3. The combined strong magnetic fishing and milling device for horizontal wells according to claim 1, characterized in that: The arc of the arc magnet (3) is consistent with the arc of the tail retrieval groove of the retrieval body (1); the arc magnet (3) is pressed and fixed to the groove surface of the corresponding arc retrieval groove by the magnet pressure plate (5).

4. The combined strong magnetic fishing and milling device for horizontal wells according to claim 1, characterized in that: A limiting seat structure (2) is correspondingly provided on the retrieval body (1) at the front end of the retrieval magnetic component. The limiting seat structure (2) limits the retrieval magnetic component, prevents the axial movement of the retrieval magnetic component, and facilitates the replacement of the retrieval magnetic component.

5. The combined strong magnetic fishing and milling device for horizontal wells according to claim 4, characterized in that: The limiting seat structure (2) is a block structure with one side being a plane and the other side being a convex arc surface. A fixing hole is provided on the limiting seat structure (2). The limiting seat structure (2) is fixed to the salvage body (1) by passing a set screw (9) through the fixing hole.

Images