Sleeve drill bit for special casing-following drilling

Abstract

The utility model provides a special casing drill bit for casing drilling, which comprises an inner drill rod, one end of the inner drill rod is connected with a directional drill bit, an outer drill rod is arranged on the surface of the inner drill rod, and the casing drill bit is arranged on the surface of the inner drill rod and positioned on one side of the outer drill rod. And a wear-resistant belt is arranged between the inner drill rod and the sleeve drill bit. According to the special casing drill bit for casing-following drilling, the outer drill rod, the casing drill bit and the wear-resistant belt are arranged on the surface of the inner drill rod with the directional drill bit and used in cooperation, and the casing drill bit for casing-following drilling has the functions of righting, wear resistance and cutting prevention. According to the novel anti-cutting surfacing wear-resistant belt casing drill bit structure, under the condition of the anti-cutting effect, the situation that the casing drill bit compacts are scraped off by forward rotation of the inner drill rod is avoided, the service life of the casing drill bit and the inner drill rod is prolonged, the number of times of pulling out of a hole is reduced, the drilling efficiency is improved, and the drilling cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of drilling equipment, in particular to a special casing drill bit for pipe drilling. Background Art

[0002] Casing drilling technology is widely used in the drilling field because it can protect the hole wall, prevent drill sticking, prevent leakage, and improve casing operation efficiency.

[0003] However, the casing drill bit body and the inner drill rod of the existing double-tube follow-up drilling are made of the same material. During the drilling process, the casing drill bit undergoes eccentric movement, causing the rigid body part of the drill bit to wear out and the casing drill bit composite piece and the inner drill rod to cut, causing the inner drill rod to be cut until it is cut off. The inner drill rod and the casing drill bit rotate in opposite directions, causing the casing drill bit composite piece to be scraped off by the inner drill rod.

[0004] Therefore, it is necessary to provide a special casing drill bit for pipe drilling to solve the above-mentioned technical problems. Utility Model Content

[0005] The utility model provides a special casing drill bit for pipe following drilling, which solves the problem that the casing drill bit body and the inner drill rod of the existing double-tube pipe following drilling are made of the same material. During the drilling process, the casing drill bit undergoes eccentric movement, causing the casing drill bit composite piece to cut with the inner drill rod after the drill bit rigid body part is worn, resulting in the inner drill rod being cut or even severed.

[0006] In order to solve the above technical problems, the utility model provides a special casing drill bit for pipe drilling, comprising:

[0007] an inner drill rod, one end of which is connected to a directional drill bit;

[0008] an outer drill rod, the outer drill rod being arranged on a surface of the inner drill rod;

[0009] A casing drill bit is arranged on the surface of the inner drill rod and located on one side of the outer drill rod.

[0010] Preferably, a wear-resistant belt is provided between the inner drill rod and the casing drill bit.

[0011] Preferably, the outer drill rod is threadedly connected to the casing drill bit.

[0012] Preferably, the wear-resistant belt is used to straighten the inner drill rod.

[0013] Preferably, the inner drill rod is threadedly connected to the directional drill bit.

[0014] Preferably, a mounting assembly is provided between the inner drill rod and the directional drill bit, the mounting assembly includes a threaded mounting hole, a threaded mounting block is provided inside the threaded mounting hole, a mounting sleeve is connected to one end of the directional drill bit, and a mounting through hole is opened between the inner drill rod and the threaded mounting block.

[0015] Preferably, a bolt is provided inside the mounting through hole, and a threaded sleeve is threadedly connected to the surface of the bolt.

[0016] Compared with the related art, the special casing drill bit for pipe drilling provided by the present invention has the following beneficial effects:

[0017] The utility model provides a special casing drill bit for pipe drilling. An outer drill rod, a casing drill bit and a wear-resistant belt are respectively arranged on the surface of an inner drill rod with a directional drill bit. The casing drill bit has the functions of straightening, wear resistance and cutting resistance. This new casing drill bit structure with anti-cutting wear-resistant belt prevents the casing drill bit composite sheet from being scraped off by the inner drill rod during forward rotation under the condition of cutting resistance, thereby extending the service life of the casing drill bit and the inner drill rod, reducing the number of drilling trips, improving the drilling efficiency and reducing the drilling cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a first embodiment of a special casing drill bit for pipe drilling provided by the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the overall external structure of the device shown;

[0020] Figure 3 for Figure 1 A schematic structural diagram of the end portion of the device shown;

[0021] Figure 4 This is a structural schematic diagram of a second embodiment of a special casing drill bit for pipe drilling provided by the present invention;

[0022] Figure 5 for Figure 1 Schematic diagram of the external structure of the device shown.

[0023] Numbers in the figure: 1, inner drill rod; 2, directional drill bit; 3, outer drill rod; 4, casing drill bit; 5, wear-resistant belt;

[0024] 6. Mounting assembly; 61. Threaded mounting hole; 62. Threaded mounting block; 63. Mounting sleeve; 64. Mounting through hole;

[0025] 7. Bolt; 8. Threaded sleeve. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0027] First embodiment

[0028] Please refer to Figure 1 、 Figure 2 and Figure 3 ,in, Figure 1 This is a structural schematic diagram of a first embodiment of a special casing drill bit for pipe drilling provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the overall external structure of the device shown; Figure 3 for Figure 1 A special casing drill bit for pipe drilling, comprising:

[0029] An inner drill rod 1, one end of which is connected to a directional drill bit 2;

[0030] An outer drill rod 3, the outer drill rod 3 being arranged on the surface of the inner drill rod 1;

[0031] The casing drill bit 4 is arranged on the surface of the inner drill rod 1 and located on one side of the outer drill rod 3 .

[0032] A wear-resistant belt 5 is provided between the inner drill rod 1 and the casing drill bit 4 .

[0033] The outer drill rod 3 is threadedly connected to the casing drill bit 4.

[0034] The wear-resistant belt 5 is used to straighten the inner drill rod 1 .

[0035] The inner drill rod 1 is threadedly connected to the directional drill bit 2.

[0036] The structure includes: an inner drill rod 1, an outer drill rod 3, a casing drill bit 4, including a directional drill bit 2 and a wear-resistant belt and a directional drill bit. This design can effectively solve the problem of mutual friction and cutting between the casing drill bit and the inner drill rod, straighten the inner drill rod, increase the service life of the casing drill bit and the inner drill rod, improve drilling efficiency, and reduce drilling costs.

[0037] In this structure, the outer drill rod 3 and the casing drill bit 4 are connected by threads, and the casing drill bit 4 and the wear-resistant belt 5 are formed by surfacing. The wear-resistant belt 5 straightens the inner drill rod 1 without damaging the inner drill rod 1. The inner drill rod 1 is connected to the directional drill bit 2 by threads.

[0038] The inner drill rod and the inner drill bit rotate clockwise, while the outer drill bit and the outer drill rod rotate counterclockwise.

[0039] Compared with the related art, the special casing drill bit for pipe drilling provided by the present invention has the following beneficial effects:

[0040] The utility model provides a special casing drill bit for pipe drilling. An outer drill rod 3, a casing drill bit 4 and a wear-resistant belt 5 are respectively arranged on the surface of an inner drill rod 1 with a directional drill bit 2 for use in conjunction with each other. The casing drill bit for pipe drilling has the functions of straightening, wear resistance and cutting resistance. This new casing drill bit structure with anti-cutting hardfacing belt prevents the casing drill bit composite sheet from being scraped off by the inner drill rod during forward rotation under the condition of cutting resistance, thereby extending the service life of the casing drill bit and the inner drill rod, reducing the number of drilling trips, improving the drilling efficiency and reducing the drilling cost.

[0041] Second embodiment

[0042] Please refer to Figure 4 and Figure 5 Based on the special casing drill bit for pipe drilling provided in the first embodiment of this application, the second embodiment of this application provides another special casing drill bit for pipe drilling. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0043] Specifically, the difference of the special casing drill bit for follow-up pipe drilling provided in the second embodiment of the present application is that, in a special casing drill bit for follow-up pipe drilling, a mounting assembly 6 is arranged between the inner drill rod 1 and the directional drill bit 2, and the mounting assembly 6 includes a threaded mounting hole 61, and a threaded mounting block 62 is arranged inside the threaded mounting hole 61. One end of the directional drill bit 2 is connected to a mounting sleeve 63, and a mounting through hole 64 is opened between the inner drill rod 1 and the threaded mounting block 62.

[0044] A bolt 7 is provided inside the mounting through hole 64 , and a threaded sleeve 8 is threadedly connected to the surface of the bolt 7 .

[0045] When opening the installation through hole 64 , firstly install the threaded mounting block 62 at one end of the directional drill bit 2 inside the threaded mounting hole 61 opened at one end of the inner drill rod 1 , and then open the installation through hole 64 .

[0046] The working principle of a special casing drill bit for pipe drilling provided by the utility model is as follows:

[0047] During use, when disassembling the directional drill bit 2 at one end of the inner drill rod 1, first remove the threaded sleeve 8 on the surface of the bolt 7. After the threaded sleeve 81 is removed, remove the bolt 7 from between the mounting sleeve 63 and the threaded mounting block 62. Then, pull the directional drill bit 2 to drive the threaded mounting block 62 to separate from the threaded mounting hole 61, and at the same time drive the mounting sleeve 63 to separate from the inner drill rod 1.

[0048] Compared with the related art, the special casing drill bit for pipe drilling provided by the present invention has the following beneficial effects:

[0049] The utility model provides a special casing drill bit for pipe drilling. A mounting assembly 6 and a bolt 7 with a threaded sleeve 8 are arranged between an inner drill rod 1 and a directional drill bit 2. The directional drill bit 2 can be easily disassembled and replaced after long-term use, and the directional drilling oil 2 can be prevented from loosening during use.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A special casing drill bit for pipe drilling, characterized in that: include: an inner drill rod, one end of which is connected to a directional drill bit; an outer drill rod, the outer drill rod being arranged on a surface of the inner drill rod; a casing drill bit, the casing drill bit being arranged on the surface of the inner drill rod and located on one side of the outer drill rod; A wear-resistant belt is provided between the inner drill rod and the casing drill bit.

2. The special casing drill bit for casing drilling according to claim 1, characterized in that: The outer drill rod is threadedly connected to the casing drill bit.

3. The special casing drill bit for casing drilling according to claim 1, characterized in that: The wear-resistant belt is used for straightening the inner drill rod.

4. The special casing drill bit for casing drilling according to claim 1, characterized in that: The inner drill rod is threadedly connected to the directional drill bit.

5. The special casing drill bit for casing drilling according to claim 1, characterized in that: A mounting assembly is provided between the inner drill rod and the directional drill bit, the mounting assembly includes a threaded mounting hole, a threaded mounting block is provided inside the threaded mounting hole, a mounting sleeve is connected to one end of the directional drill bit, and a mounting through hole is opened between the inner drill rod and the threaded mounting block.

6. The special casing drill bit for casing drilling according to claim 5, characterized in that: A bolt is provided inside the mounting through hole, and a threaded sleeve is threadedly connected to the surface of the bolt.

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