Drilling and milling centralizer and centralizing system

Abstract

The utility model relates to the technical field of drilling and milling of oil well bridge plugs, in particular to a drilling and milling centralizer and a centralizing system. The drilling and milling centralizer comprises a main shaft, one end of the main shaft is provided with a drill rod connector, and the other end of the main shaft is suitable for being connected with a drilling and milling tool; the friction piece is arranged on the main shaft in a sleeving mode and located in the middle of the main shaft, the friction piece is an elastic piece, mounting holes are formed in the two ends of the friction piece, a groove is formed in the middle of the friction piece, and a buffering piece is arranged in the groove; the bearing assembly and the oil seal structure are arranged in the mounting hole; and the shroud rings are arranged at the two ends of the friction piece. The drilling and milling centralizer prevents the drilling and milling cutter from leaning against the casing pipe to cause damage to the casing pipe by the drilling and milling cutter, enables the center of the drilling and milling cutter to be aligned with the center of the bridge plug, reduces rotation resistance of a drill rod, and enables drilling and milling operation to be carried out safely and smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well bridge plug drilling and milling, in particular to a drilling and milling centralizer and a centralizing system. Background Art

[0002] The drill tool centralizer is one of the important tools in the drilling and milling operation of oil well bridge plugs. Its main function is to support and balance the drill tool during the drilling and milling of bridge plugs to prevent the drill tool from being damaged by uneven milling due to uneven force, thereby ensuring the smooth progress of the drilling and milling process.

[0003] The structure of a drill stabilizer generally includes a main body, upper and lower clamping rings, and a swivel. The main body is made of alloy steel and can work reliably under high pressure, high temperature, and high speed working environments. The upper and lower clamping rings refer to the two metal rings inside the drill stabilizer that can be opened and retracted, which are used to fix the drill string to prevent it from rolling or tilting. The swivel refers to the rotating part that connects the drill stabilizer and other components, and is usually made of other corrosion-resistant and high-strength materials.

[0004] When the drill string is subjected to horizontal displacement during the drilling process or due to changes in formation conditions, the drill string stabilizer can be used to balance and stabilize the drill string by adjusting the position and angle of the drill string to ensure smooth drilling.

[0005] During the drilling and milling operation to unseal the bridge plug, because the diameter of the drill tool is smaller than the inner diameter of the casing, the drill tool will lean against the inner wall of the casing. During the rotation of the drill tool, friction cutting will occur on the inner wall of the casing. Utility Model Content

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the problem of friction cutting on the inner wall of the casing during the rotation of the drill tool in the prior art, thereby providing a drilling and milling centralizer and a centralizing system.

[0007] In order to solve the above technical problems, the utility model provides a drilling and milling straightener, comprising: a main shaft, one end of the main shaft is provided with a drill rod joint, and the other end is suitable for connecting a drilling and milling tool; a friction member, which is sleeved on the main shaft and located in the middle of the main shaft, and the friction member is an elastic member, and mounting holes are provided at both ends of the friction member, a groove is provided in the middle of the friction member, and a buffer member is arranged in the groove; a bearing assembly and an oil seal structure are both arranged in the mounting hole; and a hoop is arranged at both ends of the friction member.

[0008] Furthermore, the friction member includes a first friction block and a second friction block, the mounting holes are arranged at two ends of the first friction block, and the groove is arranged between the first friction block and the second friction block.

[0009] Furthermore, the second friction block is in a "X" shape.

[0010] Furthermore, the buffer member is a spring.

[0011] Furthermore, the bearing assembly includes two bearings, and the two bearings are sleeved on the main shaft and located in the mounting hole.

[0012] Furthermore, it also includes a retaining ring, which is arranged in the mounting hole and is used to fix the bearing assembly.

[0013] Furthermore, the oil seal structure comprises an oil seal body and an oil seal seat, wherein the oil seal seat is arranged in the mounting hole and close to an opening of the mounting hole, and the oil seal body is arranged on the oil seal seat.

[0014] Furthermore, the oil seal structure also includes an oil seal retaining spring, and the oil seal retaining spring is arranged on the oil seal body.

[0015] Furthermore, it also includes a locking piece, which connects the oil seal seat and the friction piece.

[0016] The utility model also provides a drilling and milling centralizing system, comprising the drilling and milling centralizing device.

[0017] The technical solution of the utility model has the following advantages:

[0018] 1. The drilling and milling straightener provided by the utility model comprises: a main shaft, one end of which is provided with a drill rod joint, and the other end is suitable for connecting a drilling and milling tool; a friction member, which is sleeved on the main shaft and located in the middle of the main shaft, and the friction member is an elastic member, with mounting holes at both ends of the friction member, a groove at the middle of the friction member, and a buffer member arranged in the groove; a bearing assembly and an oil seal structure, both of which are arranged in the mounting hole; and a hoop ring, which is arranged at both ends of the friction member.

[0019] The main shaft is connected to the drill rod joint and the drilling and milling tool by setting a drill rod joint at one end of the main shaft and a drilling and milling tool at the other end; at the same time, a friction piece is set in the middle of the main shaft, and the bearing assembly and the oil seal structure can be installed in the mounting hole of the friction piece, which plays a role in protecting the bearing assembly and the oil seal structure, and then the two ends of the friction piece are fixed by a hoop ring to ensure the stability of the connection between the friction piece and the main shaft. Among them, since the friction piece is an elastic piece and a buffer piece is set in the middle of the friction piece, when drilling and milling the downhole bridge plug, the friction piece and the buffer piece can be used for support, thereby preventing the drilling and milling tool from leaning against the casing, causing the drilling and milling tool to damage the casing and aligning the center of the drilling and milling tool with the center of the bridge plug, reducing the rotation resistance of the drill rod, and making the drilling and milling operation safe and smooth.

[0020] 2. The drilling and milling centralizer provided by the utility model has grooves at both ends of the friction blocks, and the grooves are arranged between the first friction block and the second friction block. The arrangement of the grooves facilitates the installation of the buffer in the grooves, provides a space for the installation of the buffer, and at the same time, ensures that the center of the spindle and the drilling and milling tool and the center of the casing are aligned with the center of the bridge plug.

[0021] The utility model summary is provided to introduce a selection of concepts in a simplified form, which will be further described in the following detailed description. The utility model summary is not intended to identify key features or essential features of the present disclosure, nor is it intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the drilling and milling centralizer provided by the utility model;

[0024] Figure 2 The present invention is a schematic structural diagram of the drilling and milling centralizer provided by the utility model.

[0025] Description of reference numerals:

[0026] 1. Spindle; 2. Drill rod joint; 3. Drilling and milling tool; 4. Friction part; 5. Mounting hole; 6. Groove; 7. Buffer part; 8. Bearing assembly; 9. Oil seal structure; 10. Hoop; 11. First friction block; 12. Second friction block; 13. Retaining ring; 14. Bearing; 15. Oil seal body; 16. Oil seal seat; 17. Oil seal retaining spring; 18. Locking part. DETAILED DESCRIPTION

[0027] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0028] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0030] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] The disclosure below provides many different embodiments or examples to realize different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0032] The preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0033] See also Figure 1 to Figure 2 As shown, the utility model provides a drilling and milling straightener, comprising: a main shaft 1, one end of the main shaft 1 is provided with a drill rod joint 2, and the other end is suitable for connecting a drilling and milling tool 3; a friction member 4, which is sleeved on the main shaft 1 and located in the middle of the main shaft 1, and the friction member 4 is an elastic member, and mounting holes 5 are provided at both ends of the friction member 4, a groove 6 is provided in the middle of the friction member 4, and a buffer member 7 is arranged in the groove 6; a bearing assembly 8 and an oil seal structure 9 are both arranged in the mounting hole 5; a hoop 10 is arranged at both ends of the friction member 4.

[0034] The main shaft 1 is connected to the drill rod joint 2 and the drill and milling tool 3 by arranging a drill rod joint 2 at one end of the main shaft 1 and a drill and milling tool 3 at the other end; at the same time, a friction member 4 is arranged in the middle of the main shaft 1, and the bearing assembly 8 and the oil seal structure 9 can be installed in the mounting hole 5 of the friction member 4, which plays a role in protecting the bearing assembly 8 and the oil seal structure 9, and then the two ends of the friction member 4 are fixed by the hoop 10 to ensure the stability of the connection between the friction member 4 and the main shaft 1. Among them, since the friction member 4 is an elastic member, and a buffer member 7 is arranged in the middle of the friction member 4, when drilling and milling the downhole bridge plug, the friction member 4 and the buffer member 7 can be used for support, thereby preventing the drill and milling tool 3 from leaning against the casing, causing the drill and milling tool 3 to damage the casing and aligning the center of the drill and milling tool 3 with the center of the bridge plug, reducing the rotation resistance of the drill rod, and making the drilling and milling operation safe and smooth.

[0035] Wherein, threads are provided at both ends of the main shaft 1, so as to realize the connection between the main shaft 1 and the drill rod joint 2 and the drilling and milling tool 3.

[0036] In some optional embodiments, the friction member 4 includes a first friction block 11 and a second friction block 12 , the mounting holes 5 are provided at both ends of the first friction block 11 , and the groove 6 is provided between the first friction block 11 and the second friction block 12 .

[0037] The arrangement of the groove 6 facilitates the installation of the buffer 7 in the groove 6, provides a receiving space for the installation of the buffer 7, and at the same time ensures that the center of the main shaft 1 and the center of the drilling and milling tool and the sleeve are aligned with the center of the bridge plug.

[0038] Specifically, the second friction block 12 is in a "X" shape.

[0039] In this embodiment, the buffer member 7 is a spring.

[0040] In some optional embodiments, the bearing assembly 8 includes two bearings 14 , and the two bearings 14 are sleeved on the main shaft 1 and located in the mounting hole 5 .

[0041] Since the bearing assemblies 8 are arranged at both ends of the friction member 4, there are two bearing assemblies 8 and four bearings 14, each two forming a group, which are arranged in the mounting hole 5 of the friction member 4, thereby reducing friction.

[0042] In some optional embodiments, the drilling and milling centralizer further includes a retaining ring 13 , wherein the retaining ring 13 is disposed in the mounting hole 5 , and the retaining ring 13 is used to fix the bearing assembly 8 .

[0043] There are two retaining rings 13 , which are respectively arranged at two ends of the main shaft, and the retaining rings are used to fix the two bearing assemblies 8 .

[0044] In some optional embodiments, the oil seal structure 9 includes an oil seal body 15 and an oil seal seat 16 . The oil seal seat 16 is disposed in the mounting hole 5 and close to an opening of the mounting hole 5 . The oil seal body 15 is disposed on the oil seal seat 16 .

[0045] The provision of the oil seal seat 16 provides a mounting position for the oil seal body 15 , thereby ensuring the mounting stability of the oil seal body 15 .

[0046] Meanwhile, the oil seal structure 9 further comprises an oil seal retaining spring 17, and the oil seal retaining spring 17 is arranged on the oil seal body 15. The arrangement of the oil seal retaining spring 17 can fix the oil seal body 15.

[0047] Specifically, the locking member 18 connects the oil seal seat 16 and the friction member 4 , thereby ensuring the connection stability between the oil seal seat 16 and the friction member 4 .

[0048] The locking member 18 is a screw.

[0049] During actual use of the drilling and milling centralizer, the drilling and milling tool 3 is connected to the bottom of the main shaft 1, the drill pipe joint 2 is connected to the lower end of the drill pipe, and the drilling and milling centralizer is slowly lowered into the well along with the drill pipe to carry out subsequent work.

[0050] The utility model also includes a drilling and milling centralizing system, including the drilling and milling centralizer. The drilling and milling centralizer has multiple drilling and milling centralizers, and the use of multiple drilling and milling centralizers increases the operating speed and improves the operating efficiency.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A drilling and milling centralizer, characterized in that: Comprising: A main shaft (1), one end of the main shaft (1) is provided with a drill pipe joint (2), and the other end is adapted to be connected to a drill and mill cutter (3); A friction member (4), sleeved on the main shaft (1) and located in the middle of the main shaft (1). The friction member (4) is an elastic member. Both ends of the friction member (4) are provided with mounting holes (5), a groove (6) is provided in the middle of the friction member (4), and a buffer member (7) is arranged in the groove (6); A bearing assembly (8) and a oil seal structure (9), both arranged in the mounting hole (5); A hoop (10), arranged at both ends of the friction member (4).

2. The drilling and milling centralizer according to claim 1, characterized in that: The friction member (4) includes a first friction block (11) and a second friction block (12). The mounting holes (5) are arranged at both ends of the first friction block (11), and the groove (6) is arranged between the first friction block (11) and the second friction block (12).

3. The drilling and milling centralizer according to claim 2, characterized in that: The second friction block (12) is in a shape of a capital "J".

4. The drilling and milling centralizer according to claim 2, characterized in that: The buffer member (7) is a spring.

5. The drilling and milling centralizer according to claim 2, characterized in that: The bearing assembly (8) includes two bearings (14), and the two bearings (14) are sleeved on the main shaft (1) and located in the mounting hole (5).

6. The drilling and milling centralizer according to claim 5, characterized in that: It further includes a retaining ring (13), the retaining ring (13) is arranged in the mounting hole (5), and the retaining ring (13) is used to fix the bearing assembly (8).

7. The drilling and milling centralizer according to any one of claims 1 to 6, characterized in that: The oil seal structure (9) includes an oil seal body (15) and an oil seal seat (16). The oil seal seat (16) is arranged in the mounting hole (5) and close to the opening of the mounting hole (5), and the oil seal body (15) is arranged on the oil seal seat (16).

8. The drilling and milling centralizer according to claim 7, characterized in that: The oil seal structure (9) further includes an oil seal circlip (17), and the oil seal circlip (17) is arranged on the oil seal body (15).

9. The drilling and milling centralizer according to claim 8, characterized in that: It further includes a locking member (18), and the locking member (18) connects the oil seal seat (16) and the friction member (4).

10. A drilling and milling straightening system, characterized in that: Comprising the drill and mill centralizer according to any one of claims 1-9.

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