Fixed-point coring bit structure

Abstract

The utility model discloses a fixed-point coring drill bit structure, which comprises a drill bit body and a drill bit end head, the drill bit end head is arranged at the end part of the drill bit body, the fixed-point coring drill bit structure is characterized by further comprising a drill bit core body, the drill bit body is of a cylindrical structure, and the drill bit core body is positioned in the drill bit body; the drill bit end head is provided with a through hole, and the drill bit core body penetrates through the through hole; a first pin hole is formed in the drill bit core body, a second pin hole is formed in the drill bit body, one end of the pin shaft is located in the first pin hole, and the other end of the pin shaft is located in the second pin hole. According to the utility model, the coring position can be controlled, and after the drill bit drills to a specified position, a sample can enter the drill bit structure by increasing the pressure of the drill bit and cutting off the pin shaft, so that fixed-point coring is realized.

Description

Technical Field

[0001] The utility model relates to a drill bit structure, in particular to a fixed-point coring drill bit structure, which is used for collecting samples at designated positions. Background Art

[0002] In oil drilling, the drill bit used to obtain cores is commonly called a coring bit (in general core drilling, it is called a drill bit or core drill bit). There are many types of coring bits, and their structures vary greatly, including roller core bits, scraper core bits, and cylindrical core bits, which directly affect the core recovery rate. Currently, the coring equipment on the market cannot control the core position, which brings difficulties to the actual coring operation. Utility Model Content

[0003] The purpose of the utility model is to provide a fixed-point coring drill bit structure that can control the coring position. When the drill bit drills to the specified position, the pressure of the drill bit is increased and the pin shaft is cut off, so that the sample can enter the interior of the drill bit structure, thereby realizing fixed-point coring.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A fixed-point coring drill bit structure includes a drill bit body and a drill bit end, wherein the drill bit end is installed at the end of the drill bit body. The structure is characterized in that it also includes a drill core body, the drill bit body is a cylindrical structure, and the drill core body is located in the drill bit body; the drill bit end has a through-hole, and the drill bit core body passes through the through-hole; a first pin hole is provided on the drill bit core body, and a second pin hole is provided on the drill bit body, one end of the pin shaft is located in the first pin hole, and the other end of the pin shaft is located in the second pin hole.

[0006] In the aforementioned fixed-point coring drill bit structure, one end of the drill bit core is located in the drill bit body, and the other end of the drill bit core has an end structure for drilling.

[0007] In the aforementioned fixed-point coring drill bit structure, the drill bit body includes an external casing, an annular sleeve is provided at one end of the external casing, the annular sleeve has a flange at one end close to the drill bit end, and the drill bit end has a positioning groove, and the flange is located in the positioning groove.

[0008] In the aforementioned fixed-point coring drill bit structure, a plurality of limiting strips are provided on the outer wall of the annular sleeve, a plurality of limiting grooves are provided on the drill bit end, the limiting strips are located in the limiting grooves, and the annular sleeve is fixed to the external casing by screws.

[0009] In the aforementioned fixed-point coring drill bit structure, the drill bit body also includes a coring tube, which is located in the external casing. The inner diameter of the coring tube is equal to the outer diameter of the drill bit core body, and the coring tube and the drill bit core body are coaxially arranged.

[0010] Compared to existing technologies, the present invention allows for controlled coring. Once the drill reaches the designated location, increased pressure on the drill bit shears the pin, allowing the sample to enter the drill structure, thus achieving pinpoint coring. The drill structure is mounted on a drilling rig and rotates under the rig's force, drilling into soil or rock. Once the drill reaches the designated depth, increased axial pressure shears the pin, allowing the drill core to enter the coring tube. The sample then passes through the perforation and the drill body, entering the coring tube, completing the coring operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of an embodiment of the present utility model;

[0012] Figure 2 It is a cross-sectional view of an embodiment of the present utility model.

[0013] Figure markings: 1-drill bit body, 2-annular sleeve, 3-limiting strip, 4-drill bit end, 5-end structure, 6-coring tube, 7-external casing, 8-screw, 9-pin, 10-perforation, 11-drill bit core, 12-flanging, 13-positioning groove.

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0015] Embodiment 1 of the present utility model: A fixed-point coring drill bit structure, comprising a drill bit body 1 and a drill bit end 4, the drill bit end 4 being installed at the end of the drill bit body 1, and characterized in that it also comprises a drill core 11, the drill bit body 1 is a cylindrical structure, and the drill bit core 11 is located inside the drill bit body 1; the drill bit end 4 has a through-hole 10, and the drill bit core 11 passes through the through-hole 10; a first pin hole is provided on the drill bit core 11, and a second pin hole is provided on the drill bit body 1, one end of the pin shaft 9 is located in the first pin hole, and the other end of the pin shaft 9 is located in the second pin hole.

[0016] One end of a drill core 11 is located within the drill body 1, and the other end of the drill core 11 has a tip structure 5 for drilling. The drill body 1 includes an outer sleeve 7, one end of which is provided with an annular sleeve 2. The end of the annular sleeve 2, which is close to the drill tip 4, has a flange 12. The drill tip 4 has a positioning groove 13, and the flange 12 is located within the positioning groove 13.

[0017] Example 2: A fixed-point coring drill bit structure, comprising a drill bit body 1 and a drill bit end 4, wherein the drill bit end 4 is mounted at the end of the drill bit body 1, and is characterized in that it also comprises a drill core 11, the drill bit body 1 is a cylindrical structure, and the drill bit core 11 is located inside the drill bit body 1; the drill bit end 4 has a through hole 10, and the drill bit core 11 passes through the through hole 10; a first pin hole is provided on the drill bit core 11, and a second pin hole is provided on the drill bit body 1, one end of the pin shaft 9 is located in the first pin hole, and the other end of the pin shaft 9 is located in the second pin hole.

[0018] One end of a drill core 11 is located within the drill body 1, and the other end of the drill core 11 has a tip structure 5 for drilling. The drill body 1 includes an outer sleeve 7, one end of which is provided with an annular sleeve 2. The end of the annular sleeve 2, which is close to the drill tip 4, has a flange 12. The drill tip 4 has a positioning groove 13, and the flange 12 is located within the positioning groove 13.

[0019] The outer wall of the annular sleeve 2 is provided with a plurality of limiting strips 3. The drill head 4 has a plurality of limiting grooves, within which the limiting strips 3 are located. The annular sleeve 2 is fixed to the outer casing 7 by screws 8. The drill body 1 also includes a coring tube 6, which is located within the outer casing 7. The inner diameter of the coring tube 6 is equal to the outer diameter of the drill core 11, and the coring tube 6 and the drill core 11 are coaxially arranged.

[0020] The working principle of one embodiment of the present invention is as follows: The drill bit structure is mounted on a drilling rig and rotates under the action of the drilling rig, drilling into soil or rock. When the drill reaches a specified depth, axial pressure is increased, and the pin 9 is cut under the action of pressure. The drill core 11 enters the coring tube 6, and the sample also enters the coring tube 6 through the perforation 10 and the drill body 1, thus completing the coring operation.

Claims

1. A fixed-point coring drill bit structure, comprising a drill bit body (1) and a drill bit tip (4), wherein the drill bit tip (4) is mounted at the end of the drill bit body (1), characterized in that: The drill bit also includes a drill core (11), the drill body (1) is in a cylindrical structure, and the drill core (11) is located inside the drill body (1); the drill head (4) has a through hole (10), and the drill core (11) passes through the through hole (10); a first pin hole is provided on the drill core (11), and a second pin hole is provided on the drill body (1); one end of the pin shaft (9) is located in the first pin hole, and the other end of the pin shaft (9) is located in the second pin hole.

2. A fixed-point coring drill bit structure according to claim 1, characterized in that: One end of the drill core (11) is located in the drill body (1), and the other end of the drill core (11) is provided with an end structure (5) for drilling a hole.

3. A fixed-point coring drill bit structure according to claim 2, characterized in that: The drill body (1) comprises an external sleeve (7), an annular sleeve (2) is provided at one end of the external sleeve (7), an end of the annular sleeve (2) close to the drill end (4) is provided with a flange (12), the drill end (4) is provided with a positioning groove (13), and the flange (12) is located in the positioning groove (13).

4. A fixed-point coring drill bit structure according to claim 3, characterized in that: The outer wall of the annular sleeve (2) is provided with a plurality of limiting strips (3), the drill head (4) is provided with a plurality of limiting grooves, the limiting strips (3) are located in the limiting grooves, and the annular sleeve (2) is fixed to the outer sleeve (7) by screws (8).

5. The fixed-point coring drill bit structure according to claim 4, characterized in that: The drill bit body (1) further comprises a core tube (6), which is located in the outer casing (7). The inner diameter of the core tube (6) is equal to the outer diameter of the drill bit core (11), and the core tube (6) and the drill bit core (11) are coaxially arranged.

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