Fractured drill collar fishing device

By designing a drill collar breaking salvage device including salvage pipe and male cone, the problem of low salvage efficiency after drill collar breaking is solved, and the effect of quickly completing the buckle operation is achieved.

CN222962834UActive Publication Date: 2025-06-10129 EXPLORATION TEAM GENERAL ADMINISTRATION OF CHINA COAL GEOLOGY
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Patent Information

Application Number
CN202421937701.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-12
Publication Date
2025-06-10
Estimated Expiration
2034-08-12

AI Technical Summary

Technical Problem

The drill collar may break during drilling, resulting in unfixed position, making it difficult to align with male cones and perform effective salvage, reducing salvage efficiency.

Method used

A drill collar break salvage device is designed, including a salvage pipe and a male cone. The salvage pipe is composed of a circular pipe part, a cone part and a positioning part. The design of the cone part and a positioning part allows the male cone to quickly push the upper end of the drill collar to be salvaged and complete the buckle operation.

Benefits of technology

Through this device, the male cone can quickly complete the buckle operation, which improves the efficiency of salvage after the drill collar breaks, and solves the problem of low salvage efficiency in traditional methods.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a drill collar fracture salvage device which comprises a salvage pipe, the upper end of the salvage pipe is connected with a drill rod through a connecting assembly, the salvage pipe comprises a round pipe part, a conical part and a positioning part which are sequentially connected, an insertion hole is formed in the side wall of the round pipe part, and the width of the insertion hole is larger than the diameter of a drill collar to be salvaged; and the male tap is mounted at one end, far away from the circular tube part, of the positioning part. The utility model has the beneficial effects that compared with the traditional practical die tap for punching, the die tap can quickly abut against the upper end surface of a drill collar to be fished and complete the thread making operation by arranging the conical part and the positioning part, so that the working efficiency is improved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of drilling, and particularly relates to a drill collar fracture fishing device. Background Technique

[0002] During the drilling process, the drill collar may break. In the prior art, a male taper is used to drill holes in the upper end of the drill collar and then fishing operations are carried out. However, after the drill collar breaks, its position is not fixed, resulting in difficulty for the male taper to align with the upper end of the drill collar, and thus low fishing efficiency. Content of the Utility Model

[0003] In view of this, the utility model aims to propose a drill collar fracture fishing device in order to solve at least one of the above partial technical problems.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A drill collar fracture fishing device, comprising:

[0006] A fishing pipe, the upper end of the fishing pipe is connected to a drill pipe through a connection assembly. The fishing pipe includes a circular pipe portion, a conical portion, and a positioning portion connected in sequence. An insertion hole is formed in the side wall of the circular pipe portion, and the width of the insertion hole is greater than the diameter of the drill collar to be fished;

[0007] A male taper, which is installed at one end of the positioning portion away from the circular pipe portion.

[0008] Further, the outer diameter of the circular pipe portion is smaller than the inner diameter of the drilling well. The inner diameter of the lower end of the conical portion matches the inner diameter of the circular pipe portion, and the inner diameter of the upper end of the conical portion matches the inner diameter of the positioning portion;

[0009] The inner diameter of the positioning portion matches the diameter of the drill collar to be fished.

[0010] Further, the insertion hole is provided with an opening at one end of the circular pipe portion away from the positioning portion. The edges at both ends of the opening adopt a chamfer structure, and the radian at the bottom end of the chamfer structures at both ends of the two openings is greater than 180°.

[0011] Further, notches are formed on both sides at one end of the insertion hole away from the opening, and the radian of the two notches is greater than 180°.

[0012] Further, a guiding block is fixedly arranged inside the circular pipe portion. The guiding block is installed between the notch and the chamfer structure of the opening. One end of the guiding block corresponds to the edge of the insertion hole, and the other end is located inside the circular pipe portion;

[0013] The thickness of one end of the guiding block close to the edge of the insertion hole is smaller than that of the other end.

[0014] Further, the connecting component includes a connecting seat and a cover plate;

[0015] One end of the fishing pipe away from the circular pipe part is fixedly provided with a rotating disk, the diameter of the rotating disk is larger than that of the positioning part, and a limiting boss is fixedly arranged on the outer side wall of the rotating disk;

[0016] A rotating groove matching with the rotating disk is formed in the connecting seat, a rotating hole is formed at the bottom of the rotating groove, the positioning part is installed inside the rotating hole, and the rotating disk is installed inside the rotating groove;

[0017] An arc-shaped limiting groove corresponding to the limiting boss is formed on the inner side wall of the rotating groove, and the limiting boss is installed inside the arc-shaped limiting groove.

[0018] Further, an arc-shaped reset groove corresponding to the limiting boss is formed on the inner side wall of the rotating groove, and a compression spring is arranged between the two sides of the arc-shaped reset groove and the limiting boss.

[0019] Further, arc-shaped guide rods are fixedly arranged on two sides of the arc-shaped reset groove, arc-shaped guide tubes matching with the arc-shaped guide rods are fixedly arranged on two sides of the limiting boss, the arc-shaped guide rods are installed inside the arc-shaped guide tubes, and the compression spring is installed outside the arc-shaped guide rods.

[0020] Further, a threaded hole is formed at the upper end of the connecting seat, the cover plate is used to close the rotating groove, a through hole corresponding to the threaded hole is formed on the cover plate, a connecting bolt is arranged in the through hole, and the connecting bolt passes through the through hole and is threadedly connected with the connecting seat;

[0021] One end of the cover plate away from the connecting seat is fixedly provided with a connecting rod, and the connecting rod is detachably connected with the drill pipe.

[0022] Compared with the prior art, the drill collar fracture fishing device of the present invention has the following beneficial effects:

[0023] For the drill collar fracture fishing device of the present invention, compared with the traditional use of a male taper to punch holes, by setting the conical part and the positioning part, the male taper can quickly press against the upper end face of the drill collar to be fished and complete the button-making operation, improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic three-dimensional structure diagram of the device according to the embodiment of the present invention;

[0026] Figure 2 Schematic three-dimensional structure diagram of the fishing pipe according to an embodiment of the present utility model;

[0027] Figure 3 Schematic three-dimensional structure diagram of the connecting seat according to an embodiment of the present utility model;

[0028] Figure 4 Schematic cross-sectional structure diagram of the device according to an embodiment of the present utility model;

[0029] Figure 5 Schematic cross-sectional structure diagram of the connecting seat in the sectional view according to an embodiment of the present utility model;

[0030] Figure 6 Schematic cross-sectional structure diagram at the guide block according to an embodiment of the present utility model;

[0031] Figure 7 Schematic cross-sectional structure diagram of the contact state between the fishing pipe and the drill collar according to an embodiment of the present utility model;

[0032] Figure 8 Schematic sectional view of the state where the drill collar is located inside the socket of the fishing pipe according to an embodiment of the present utility model.

[0033] Description of the reference numerals:

[0034] 1. Fishing pipe; 2. Connecting seat; 3. Cover plate; 4. Connecting bolt; 5. Guide block; 6. Compression spring; 7. Male taper; 101. Circular pipe part; 102. Conical part; 103. Positioning part; 104. Rotating disk; 105. Limit boss; 106. Arc-shaped guide pipe; 107. Notch; 108. Insertion hole; 109. Chamfer structure; 201. Rotating hole; 202. Threaded hole; 203. Rotating groove; 204. Arc-shaped reset groove; 205. Arc-shaped limit groove; 206. Guide rod; 301. Connection. Detailed implementation manners

[0035] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0039] As Figures 1 to 8 shown, a drill collar fracture fishing device includes:

[0040] A fishing pipe, the upper end of the fishing pipe is connected to a drill pipe through a connection assembly. The fishing pipe includes a circular pipe portion, a tapered portion, and a positioning portion connected in sequence. Insertion holes are formed in the side wall of the circular pipe portion, and the width of the insertion holes is greater than the diameter of the drill collar to be fished.

[0041] A male taper, which is installed at one end of the positioning portion away from the circular pipe portion.

[0042] The outer diameter of the circular pipe portion is smaller than the inner diameter of the drilling. The inner diameter of the lower end of the tapered portion matches the inner diameter of the circular pipe portion, and the inner diameter of the upper end of the tapered portion matches the inner diameter of the positioning portion.

[0043] The inner diameter of the positioning portion matches the diameter of the drill collar to be fished.

[0044] The insertion holes are provided with openings at one end of the circular pipe portion away from the positioning portion. The edges at both ends of the openings adopt a chamfer structure, and the radian at the bottom end of the chamfer structures at both ends of the two openings is greater than 180°.

[0045] Insertion holes are provided with notches on both sides away from the open end, and the arcs of the two notches are greater than 180°. The distance from the top end of the notch to the lower end of the circular tube part is 60 mm, and the distance from the bottom end of the notch to the lower end of the circular tube part is 40 mm.

[0046] A guide block is fixedly installed inside the circular tube part. The guide block is installed between the notch and the chamfer structure of the opening. One end of the guide block corresponds to the edge of the insertion hole, and the other end is located inside the circular tube part; the thickness of one end of the guide block near the edge of the insertion hole is less than that of the other end.

[0047] The connection assembly includes a connection seat and a cover plate;

[0048] A rotating disk is fixedly installed at one end of the fishing tube away from the circular tube part. The diameter of the rotating disk is larger than that of the positioning part, and a limiting boss is fixedly installed on the outer side wall of the rotating disk;

[0049] A rotating groove matching the rotating disk is opened inside the connection seat. A rotating hole is opened at the bottom of the rotating groove. The positioning part is installed inside the rotating hole, and the rotating disk is installed inside the rotating groove;

[0050] An arc-shaped limiting groove corresponding to the limiting boss is opened on the inner side wall of the rotating groove, and the limiting boss is installed inside the arc-shaped limiting groove.

[0051] An arc-shaped reset groove corresponding to the limiting boss is opened on the inner side wall of the rotating groove. Compression springs are arranged between both sides of the arc-shaped reset groove and the limiting boss.

[0052] Arc-shaped guide rods are fixedly installed on both sides of the arc-shaped reset groove. Arc-shaped guide tubes matching the arc-shaped guide rods are fixedly installed on both sides of the limiting boss. The arc-shaped guide rods are installed inside the arc-shaped guide tubes, and the compression springs are installed outside the arc-shaped guide rods.

[0053] A threaded hole is opened at the upper end of the connection seat. The cover plate is used to close the rotating groove. A through hole corresponding to the threaded hole is opened on the cover plate. A connection bolt is arranged inside the through hole. The connection bolt passes through the through hole and is threadedly connected with the connection seat; A connecting rod is fixedly installed at one end of the cover plate away from the connection seat, and the connecting rod is detachably connected with the drill pipe.

[0054] Working process:

[0055] A method for fishing a broken drill collar includes the following steps:

[0056] S1. Connect the device with the drill pipe, lower it to a depth 1 m away from the fracture depth, and then reduce the lowering speed. When reaching the fracture depth;

[0057] If the resistance keeps increasing (as shown in Figure 7 ), then lift and rotate the drill pipe by 180° and repeat step S1;

[0058] After the drill pipe is rotated 180°, during the process of lowering the drill pipe, under the guiding action of the chamfer structure, the fishing pipe and the drill pipe rotate relative to each other, so that the drill collar to be salvaged enters the inner side of the insertion hole. During this process, the compression spring is compressed. During the process of rotating the drill pipe, the fishing pipe and the drill pipe rotate relative to each other, and both sides of the arc-shaped limiting groove push the limiting boss to make the fishing pipe and the drill pipe rotate synchronously. Only by rotating 180° can the drill collar to be salvaged enter the inner side of the insertion hole, improving the working efficiency.

[0059] The radian of the arc-shaped limiting groove is more than twice the radian of the chamfer structure.

[0060] If the resistance remains unchanged or decreases after the resistance appears (as Figure 8 shown), then the first distance threshold for lowering, the first distance threshold is greater than 40 mm and less than 60 mm. At this time, the upper end of the drill collar to be salvaged corresponds to the position of the notch, and then the drill pipe is rotated. Under the guiding action of the guiding plate, the upper end of the drill collar to be salvaged enters the inner side of the circular tube part;

[0061] S2. Continue to lower the drill pipe. Under the guiding action of the conical part, the drill collar to be salvaged enters the inner side of the positioning part until the resistance increases. At this time, the male taper contacts the end face of the drill collar to be salvaged;

[0062] S3. Rotate the drill pipe to drive the male taper to catch and twist. Use the male taper to make a thread on the end face of the drill collar to be salvaged. When the stuck drill is serious, lift the drill tool and observe the change in the reading of the weight pointer;

[0063] If the change of the weight pointer is greater than the weight threshold, it means that the threading is successful, and lift the drill pipe to take out the drill collar to be salvaged. The weight threshold is the weight of the drill collar to be salvaged and the drill bit.

[0064] Compared with the traditional method of using a male taper to drill holes, by setting the conical part and the positioning part, the male taper can quickly press against the upper end face of the drill collar to be salvaged and complete the threading operation, improving the working efficiency.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

[0066] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drill collar fracture salvage device, characterized in that: include: A salvage pipe (1), the upper end of which is connected to a drill pipe via a connection assembly, the salvage pipe (1) comprising a circular tube portion (101), a conical portion (102), and a positioning portion (103) which are connected in sequence, an insertion hole (108) being provided on a side wall of the circular tube portion (101), the width of the insertion hole (108) being greater than the diameter of a drill collar to be salvaged; A male cone (7) is installed at an end of the positioning portion (103) away from the circular tube portion (101).

2. A drill collar fracture salvage device according to claim 1, characterized in that: The outer diameter of the circular tube portion (101) is smaller than the inner diameter of the wellbore, the inner diameter of the lower end of the conical portion (102) matches the inner diameter of the circular tube portion (101), and the inner diameter of the upper end of the conical portion (102) matches the inner diameter of the positioning portion (103); The inner diameter of the positioning portion (103) matches the diameter of the drill collar to be salvaged.

3. A drill collar fracture salvage device according to claim 2, characterized in that: The insertion hole (108) is provided with an opening at one end of the circular tube portion (101) away from the positioning portion (103), the edges at both ends of the opening adopt chamfered structures (109), and the curvature of the bottom ends of the chamfered structures (109) at both ends of the opening is greater than 180°.

4. A drill collar fracture salvage device according to claim 2, characterized in that: The insertion hole (108) is provided with notches (107) on both sides of one end away from the opening, and the arcs of the two notches (107) are greater than 180°.

5. A drill collar fracture salvage device according to claim 4, characterized in that: A guide block (5) is fixedly arranged on the inner side of the circular tube (101), and the guide block (5) is installed between the notch (107) and the chamfered structure (109) of the opening, and one end of the guide block (5) corresponds to the edge of the insertion hole (108), and the other end is located on the inner side of the circular tube (101); The thickness of one end of the guide block (5) adjacent to the insertion hole (108) is smaller than the thickness of the other end.

6. The drill collar fracture salvage device according to claim 1, characterized in that: The connecting assembly comprises a connecting seat (2) and a cover plate (3); A rotating disk (104) is fixedly provided at one end of the salvage pipe (1) away from the circular tube portion (101); the diameter of the rotating disk (104) is larger than the diameter of the positioning portion (103); and a limiting boss (105) is fixedly provided on the outer side wall of the rotating disk (104); The connecting seat (2) has a rotating groove (203) matching the rotating disk (104), the bottom of the rotating groove (203) has a rotating hole (201), the positioning portion (103) is installed on the inner side of the rotating hole (201), and the rotating disk (104) is installed on the inner side of the rotating groove (203); An arc-shaped limiting groove (205) corresponding to the limiting boss (105) is formed on the inner side wall of the rotating groove (203), and the limiting boss (105) is installed on the inner side of the arc-shaped limiting groove (205).

7. A drill collar fracture salvage device according to claim 6, characterized in that: An arc-shaped reset groove (204) corresponding to the limiting boss (105) is formed on the inner side wall of the rotating groove (203), and a compression spring (6) is provided between the two sides of the arc-shaped reset groove (204) and the limiting boss (105).

8. A drill collar fracture salvage device according to claim 7, characterized in that: Arc-shaped guide rods (206) are fixedly provided on both sides of the arc-shaped reset groove (204), arc-shaped guide tubes (106) matching the arc-shaped guide rods (206) are fixedly provided on both sides of the limiting boss (105), the arc-shaped guide rod (206) is installed on the inner side of the arc-shaped guide tube (106), and the compression spring (6) is installed on the outer side of the arc-shaped guide rod (206).

9. A drill collar fracture salvage device according to claim 8, characterized in that: The upper end of the connection seat (2) is provided with a threaded hole (202); the cover plate (3) is used to close the rotation groove (203); a through hole corresponding to the threaded hole (202) is provided on the cover plate (3); a connecting bolt (4) is provided in the through hole; the connecting bolt (4) passes through the through hole and is threadedly connected to the connection seat (2); A connecting rod (301) is fixedly provided at one end of the cover plate (3) away from the connecting seat (2), and the connecting rod (301) is detachably connected to the drill rod.