Magnetic plugboard for fishing small falling objects in well

Abstract

The utility model discloses a magnetic plugboard for fishing small falling objects in a well, and relates to the field of oil and gas field well drilling and downhole operation. The device comprises a connector, the upper end of the connector is in threaded connection with a fishing pipe column, the connector comprises magnetic steel, an insertion rod base and a mushroom insertion rod, the magnetic steel is installed in the connector, the insertion rod base is installed at the bottom of the connector and magnetically attracted to the bottom end of the connector, the insertion rod base is made of magnetic materials, and the mushroom insertion rod is magnetically attracted into a through hole in the bottom of the insertion rod base. The mushroom inserting rod is used for adsorbing magnetic or non-magnetic objects in the well. According to the device, various falling objects can be fished out in the underground operation process under different conditions, a plurality of mushroom inserting rods which are distributed in disorder are arranged, a plurality of spaces for clamping and containing small falling objects are formed in gaps of the mushroom inserting rods, the falling objects can be conveniently inserted and hooked, the adsorption force to the falling objects is increased through magnetic steel, the falling objects can be fished out from multiple points and multiple directions, operation is easy, and the device is convenient to use. And the application range of the tool is expanded by combining the functions of the magnet fisher and the inserting plate.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field drilling and downhole operation technology, specifically a magnetic insert for retrieving small objects that have fallen into a well. Background Technology

[0002] In the drilling and downhole operations of oil, gas, and water wells, and even in the process of oil production, magnetic or non-magnetic objects, or objects with irregular shapes, often fall into the well, such as tool fragments, rubber fragments, ropes, screws, and other small objects, which need to be retrieved.

[0003] Currently used magnetic retrieval tools are limited to retrieving small magnetic objects and are restricted by the rated operating temperature inside the well, thus limiting the working depth. While nail plate retrieval tools have limited gripping and hooking capabilities, objects are prone to slipping and falling due to vibrations during operation, resulting in inconsistent gripping. Furthermore, these tools have a small operating range, low efficiency, and poor retrieval results. To address these issues, this invention proposes a magnetic insert plate for retrieving small objects dropped into wells. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a magnetic insert plate for retrieving small objects dropped into wells. This solves the problems of commonly used magnetic retrievers being limited to retrieving small magnetic objects and restricted by the rated working temperature inside the well, thus limiting the working depth; while nail plate retrievers have limited ability to hold and hook objects, and with shaking and vibration during operation, objects are prone to slipping out of the hand and falling off again, resulting in situations where objects cannot be firmly held, a small working range, low work efficiency, and poor retrieval effect.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a magnetic insert plate for retrieving small objects dropped into a well, comprising a connector, the upper end of which is threadedly connected to a retrieval tubing string. The connector includes a magnet, a rod holder, and a mushroom-shaped insert. The magnet is installed inside the connector, the rod holder is installed at the bottom of the connector, and the rod holder is magnetically attracted to the bottom of the connector. The rod holder is made of a magnetic material, and the mushroom-shaped insert is magnetically attracted to a through hole at the bottom of the rod holder. The mushroom-shaped insert is also made of a magnetic material, and the mushroom-shaped insert is used to attract magnetic or non-magnetic objects in the well.

[0006] Preferably, the mushroom-shaped insertion rods are randomly distributed and installed on the insertion rod base in a sparse and dense manner. The spacing between each group of mushroom-shaped insertion rods is designed to match the major and minor axis dimensions of the falling object. The arrangement of the mushroom-shaped insertion rods is used to improve the capture efficiency of magnetic or non-magnetic objects.

[0007] Preferably, the bottom end of the connector is provided with a steel sleeve, the top end of the steel sleeve is provided with an upper thread, and the connector is threaded into the upper thread.

[0008] Preferably, the top end of the insertion rod seat is provided with an insertion rod seat thread, and the bottom end of the steel sleeve is threaded into the insertion rod seat thread. The steel sleeve is used to connect the connector and the insertion rod seat.

[0009] Preferably, a spacer is installed on the inner wall of the steel sleeve, a buffer pad is provided at the bottom of the joint, and the upper part and the surrounding parts of the magnet are wrapped with the buffer pad and the spacer. The buffer pad and the spacer are used to protect the magnet and isolate the top and the surrounding parts from interference with the magnetic field.

[0010] Preferably, the end of the mushroom-shaped insert is fixedly connected with a base wire, which is magnetically attracted to the insert seat and fixed by electric welding.

[0011] Preferably, the connector has a water eye and the magnet has a central pipe, and the water eye and the central pipe are used for drainage.

[0012] This utility model discloses a magnetic insert plate for retrieving small objects dropped into wells. Its beneficial effects are as follows: This magnetic insert plate can retrieve various magnetic or non-magnetic small objects dropped into wells with different diameters, temperatures, and hard bottoms during drilling and downhole operations. Several randomly distributed mushroom-shaped inserts are positioned with gaps providing multiple spaces to clamp and accommodate small objects, facilitating insertion and hooking. The magnets increase the attraction force on the objects, enabling retrieval from multiple points and directions. It can be reused multiple times and is easy to operate. By combining the functions of a magnetic retrieval tool and an insert plate, the tool's application range is expanded, its applicability is strong, and its operational efficiency and success rate are improved. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0015] Figure 2 This is a top view of the structure of this utility model.

[0016] In the diagram: 1. Buffer pad; 2. Magnet; 3. Water eye; 4. Central tube; 5. Mushroom-shaped insert; 6. Connector; 7. Upper thread; 8. Steel sleeve; 9. Spacer; 10. Insert holder thread; 11. Insert holder; 12. Wire guide. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] This application provides a magnetic insert plate for retrieving small objects dropped into a well. This solves the problems of commonly used magnetic retrievers being limited to retrieving small magnetic objects and restricted by the rated working temperature in the well, thus limiting the working depth; while nail plate retrievers have limited ability to hold and hook objects, and with shaking and vibration during operation, objects are prone to slipping and falling again, resulting in situations where objects cannot be firmly held, a small working range, low work efficiency, and poor retrieval effect.

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] This utility model discloses a magnetic insert for retrieving small objects that have fallen into a well.

[0021] Example 1

[0022] According to the appendix Figure 1-2 As shown, the system includes a connector 6, the upper end of which is threaded to the retrieval tubing string. The connector 6 includes a magnet 2, a rod holder 11, and mushroom-shaped rods 5. The magnet 2 is installed inside the connector 6, and the rod holder 11 is installed at the bottom of the connector 6. The rod holder 11 is magnetically attached to the bottom of the connector 6. The rod holder 11 is made of magnetic material. The mushroom-shaped rods 5 are magnetically attached to the through-hole at the bottom of the rod holder 11. The mushroom-shaped rods 5 are also made of magnetic material and are used to attract magnetic or non-magnetic objects in the well. The mushroom-shaped rods 5 are randomly distributed and alternately installed on the rod holder 11. Each group of mushroom-shaped rods... The gap design matches the major and minor axis dimensions of the falling object. The arrangement of the mushroom-shaped inserts 5 is used to improve the capture efficiency of magnetic or non-magnetic objects. The gaps are designed with multiple minor and major axis dimensions for small falling objects, so that there is space to clamp and accommodate falling objects at multiple points and in multiple directions. The expected drilling pressure is slowly applied, and the mushroom-shaped inserts 5 are inserted into the soft small falling object, or the small falling object is squeezed into the gaps of different sizes of the mushroom-shaped inserts 5. The elastic clamping force holds the falling object, and the larger mushroom head hooks the falling object. The fishing string is slowly lifted and lowered several times, and the orientation is rotated for trial lifting. The fishing string is then pulled out of the wellbore.

[0023] Example 2

[0024] Based on Example 1, according to Appendix Figure 1-2As shown, a steel sleeve 8 is provided at the bottom of the connector 6, and an upper thread 7 is provided at the top of the steel sleeve 8. The connector 6 is threaded into the upper thread 7. The top of the connector 6 is provided with a transition surface, and the included angle α between the connector 6 and the vertical surface is 45°, which facilitates the lowering of the retrieval string.

[0025] The top of the insertion rod seat 11 is provided with an insertion rod seat thread 10, and the bottom end of the steel sleeve 8 is threaded into the insertion rod seat thread 10. The steel sleeve 8 is used to connect the joint 6 and the insertion rod seat 11. The outer diameter of the insertion rod seat 11 is Φ≦8~15mm of the inner diameter of the well barrel. When the well barrel is intact and unobstructed, a tool with a larger outer diameter is beneficial to cover small objects that have fallen, thereby improving the success rate of retrieval.

[0026] A spacer 9 is installed on the inner wall of the steel sleeve 8, and a buffer pad 1 is provided at the bottom of the connector 6. The upper part and the surrounding area of ​​the magnet 2 are wrapped by the buffer pad 1 and the spacer 9. The buffer pad 1 and the spacer 9 are used to protect the magnet 2 and isolate the top and surrounding areas from interference with the magnetic field.

[0027] The end of the mushroom-shaped insert rod 5 is fixedly connected with a guide wire 12. The guide wire 12 is magnetically attracted to the insert rod seat 11 and fixed by electric welding. The exposed length L of the mushroom-shaped insert rod 5 is 2 to 3 times the long axis H of the small object, leaving redundancy. Waste sucker rods are selected as the material for making the mushroom-shaped insert rod 5. It is fixed by electric welding to increase strength and annealing to increase the flexibility of the insert rod and prevent breakage. At the same time, the mushroom-shaped insert rod 5 should not be placed too close to the edge of the insert rod seat 11 to prevent the object hooked on its outer edge from forming a large size, which is not conducive to pulling it out of the well.

[0028] The connector 6 has a water eye 3 inside, and the magnet 2 has a central pipe 4 inside. The water eye 3 and the central pipe 4 are used for drainage.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A magnetic plug for fishing small objects from a well, comprising a joint (6) which is threadedly connected to a fishing string at its upper end, characterised in that, The joint (6) comprises: A magnetic steel (2) is installed in the joint (6); A plug rod base (11) is installed at the bottom of the joint (6), and the plug rod base (11) is magnetically attracted to the bottom end of the joint (6), and the plug rod base (11) is a magnetic material; A mushroom plug rod (5) is magnetically attracted to the through hole at the bottom of the plug rod base (11), and the mushroom plug rod (5) is also a magnetic material, and the mushroom plug rod (5) is used for adsorbing magnetic or non-magnetic objects in a well.

2. The magnetic plug according to claim 1, wherein: The mushroom plug rods (5) are installed on the plug rod base (11) in a disorderly and sparsely and densely distributed manner, the gap between each group of the mushroom plug rods (5) is designed to match the long and short axis sizes of the falling objects, and the arrangement of the mushroom plug rods (5) is used to improve the capture efficiency of the magnetic or non-magnetic objects.

3. The magnetic plug according to claim 1, wherein: A steel sleeve (8) is arranged at the bottom end of the joint (6), an upper thread (7) is formed at the top end of the steel sleeve (8), and the joint (6) is threadedly connected in the upper thread (7).

4. The magnetic plug according to claim 3, wherein: A plug rod base thread (10) is formed at the top end of the plug rod base (11), and the bottom end of the steel sleeve (8) is threadedly connected in the plug rod base thread (10), so that the steel sleeve (8) is used for connecting the joint (6) and the plug rod base (11).

5. The magnetic plug according to claim 3, wherein: A spacer (9) is installed on the inner wall of the steel sleeve (8), a buffer pad (1) is arranged at the bottom of the joint (6), the upper part and the periphery of the magnetic steel (2) are wrapped by the buffer pad (1) and the spacer (9), and the buffer pad (1) and the spacer (9) are used for protecting the magnetic steel (2) and isolating the top and the periphery from the interference of the magnetic field.

6. The magnetic plug according to claim 1, wherein: A silk (12) is fixedly connected to the end of the mushroom plug rod (5), and the silk (12) is magnetically attracted in the plug rod base (11) and is electrically welded.

7. The magnetic plug according to claim 1, wherein: A water eye (3) is formed in the joint (6), and a middle pipe (4) is formed in the magnetic steel (2), and the water eye (3) and the middle pipe (4) are used for draining water.

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