Near-bit gamma measuring instrument

Abstract

The utility model relates to the technical field of measuring instruments, in particular to a near-bit gamma measuring instrument. According to the technical scheme, the near-bit gamma measuring instrument comprises a drill rod body, a damping mechanism and a fixing mechanism; wherein a drill bit is fixedly arranged at the bottom of the drill rod body; the two damping mechanisms are symmetrically arranged in the drill rod body at intervals in the axial direction of the drill rod body and used for damping protection of the measuring instrument. The fixing mechanism is arranged on the damping mechanism and used for fixing the measuring instrument. The utility model provides a near-bit gamma measuring instrument. The near-bit gamma measuring instrument solves the technical problem that an existing near-bit gamma measuring instrument is prone to falling off from a rod body in the working process.

Description

Technical Field

[0001] This utility model relates to the field of measuring instrument technology, and in particular to a near-drill bit gamma measuring instrument. Background Technology

[0002] Near-bit gamma measurement instruments can be used to determine the abundance of organic matter and clay content in shale reservoirs, identify the location of the top and bottom plates of coalbed methane, and have extremely high application value in the location and assessment of unconventional oil layers and the development of coalbed methane.

[0003] Existing near-bit gamma measuring instruments are directly fixed inside the drill pipe. However, the drill pipe is easily subjected to external impacts during operation, which can cause the gamma measuring instrument inside the drill pipe to loosen or fall off, affecting the durability of the equipment. Utility Model Content

[0004] This invention provides a near-bit gamma measuring instrument, which solves the technical problem that existing near-bit gamma measuring instruments are prone to falling off the rod during operation.

[0005] To achieve this technical objective, the present invention adopts the following solution: a near-bit gamma measuring instrument, comprising a drill pipe body, a shock absorption mechanism, and a fixing mechanism; wherein,

[0006] A drill bit is fixed at the bottom of the drill pipe body;

[0007] Two sets of shock absorption mechanisms are symmetrically arranged at intervals along the axial direction of the drill pipe body inside the drill pipe body. The shock absorption mechanisms are used for shock absorption and protection of the measuring instrument.

[0008] The fixing mechanism is mounted on the shock absorption mechanism and is used to fix the measuring instrument.

[0009] Furthermore, each set of damping mechanisms includes multiple damping mechanisms that are equally spaced along the circumference of the drill pipe body;

[0010] The damping mechanism includes a fixed block, a guide rod, a slider, a hydraulic damper, and a connecting rod; among which;

[0011] Two fixing blocks are fixedly mounted on the inner wall of the drill pipe body at intervals along the axial direction of the drill pipe body;

[0012] The two ends of the guide rod are fixedly connected to the two opposite sides of the two fixed blocks, respectively;

[0013] Two sliders are slidably mounted on the guide rod;

[0014] Two hydraulic shock absorbers are arranged side by side with the guide rod, and the two hydraulic shock absorbers are respectively positioned between the two sliders and the two fixed blocks;

[0015] One end of the connecting rod is hinged to the slider, and the other end of the connecting rod is hinged to the fixing mechanism.

[0016] Furthermore, the hydraulic shock absorber includes a top cover, a hydraulic rod, a bottom cover, and a spring;

[0017] One side of the top cover is fixedly connected to the slider;

[0018] One side of the bottom cover is fixedly connected to the fixing block;

[0019] The two ends of the hydraulic rod are fixedly connected to the side of the top cover away from the slider and the side of the bottom cover away from the fixed block, respectively;

[0020] The spring is sleeved on the outside of the hydraulic rod, and the two ends of the spring are fixedly connected to the top cover and the bottom cover, respectively.

[0021] Furthermore, the fixing mechanism is frustum-shaped, with its outer wall hinged to the connecting rod. The fixing mechanism has a recessed platform, and multiple clearance holes for accommodating bolts are equally spaced along its circumference inside the recessed platform. A through hole is provided in the center of the recessed platform, and the recessed platforms of the two fixing mechanisms are arranged opposite to each other.

[0022] Furthermore, the measuring instrument is positioned between two recessed platforms and connected to the fixing mechanism by bolts.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. This utility model is equipped with a shock absorption mechanism, which can effectively reduce the vibration of the drill pipe body during operation, thereby preventing the measuring instrument from falling off the drill pipe body and improving the durability of the equipment.

[0025] 2. When the drill bit is working, the slider will slide up and down along the guide rod under the action of vibration. At this time, the hydraulic shock absorber can buffer the slider to a certain extent, prevent the vibration from directly acting on the measuring instrument, and improve the vibration resistance of the equipment. Attached Figure Description

[0026] Figure 1 A schematic diagram of a near-drill bit gamma measuring instrument provided for an embodiment of this utility model;

[0027] Figure 2 A schematic diagram of the interior of the drill rod body of a near-bit gamma measuring instrument provided for an embodiment of this utility model:

[0028] Figure 3 for Figure 2 Enlarged view of part A in the middle:

[0029] Figure 4 A schematic diagram showing the connection of the fixing mechanism and the shock absorption mechanism provided in the embodiment of this utility model;

[0030] Figure 5 A schematic diagram of a hydraulic shock absorber provided in an embodiment of this utility model.

[0031] 1. Drill rod body; 2. Vibration damping mechanism; 21. Fixing block; 22. Guide rod; 23. Slider; 24. Hydraulic shock absorber; 241. Top cover; 242. Hydraulic rod; 243. Bottom cover; 244. Spring; 25. Connecting rod; 3. Fixing mechanism; 31. Recessed platform; 32. Clearance hole; 33. Through hole; 4. Drill bit; 5. Measuring instrument; 6. Bolt. Detailed Implementation

[0032] To fully understand the purpose, features and effects of this utility model, the following specific embodiments will be used to describe this utility model in detail, but this utility model is not limited thereto.

[0033] like Figures 1 to 4 As shown, the present invention provides a near-drill bit gamma measuring instrument, comprising a drill rod body 1, a shock absorption mechanism 2, and a fixing mechanism 3. The drill rod body 1 has a hollow structure, and a measuring instrument 5 is installed inside it. A drill bit 4 is fixedly mounted at the bottom of the drill rod body 1.

[0034] The shock absorption mechanism 2 is used for shock absorption and protection of the measuring instrument 5, preventing vibration forces from directly acting on the measuring instrument 5. For example... Figure 2 As shown, two sets of damping mechanisms 2 are symmetrically arranged at intervals along the axial direction of the drill pipe body 1 inside the drill pipe body 1.

[0035] Please continue to refer to this. Figure 2 Each set of damping mechanisms 2 includes multiple damping mechanisms 2, which are equally spaced along the circumference of the drill pipe body 1. In this embodiment, each set of damping mechanisms 2 includes three damping mechanisms 2.

[0036] For specific details, please refer to... Figure 2 and Figure 3 The shock absorption mechanism 2 includes a fixed block 21, a guide rod 22, a slider 23, a hydraulic shock absorber 24, and a connecting rod 25. Two fixed blocks 21 are fixedly mounted on the inner wall of the drill pipe body 1 at axial intervals along the axial direction. A guide rod 22 is provided between these two fixed blocks 21, with its two ends fixedly connected to the two opposite sides of the fixed blocks 21. Two sliders 23 are slidably mounted on the guide rod 22. A hydraulic shock absorber 24 is provided between each slider 23 and each fixed block 21. These two hydraulic shock absorbers 24 are arranged parallel to the guide rod 22, and their two ends are fixedly connected to the fixed block 21 and the slider 23, respectively. A connecting rod 25 is hinged to the side of each slider 23 closest to the fixed mechanism 3, and the end of the connecting rod 25 away from the slider 23 is hinged to the fixed mechanism 3.

[0037] like Figure 5As shown, the hydraulic shock absorber 24 includes a top cover 241, a hydraulic rod 242, a bottom cover 243, and a spring 244. One side of the top cover 241 is fixedly connected to the slider 23, and one side of the bottom cover 243 is fixedly connected to the fixing block 21. The hydraulic rod 242 is positioned between the top cover 241 and the bottom cover 243, with both ends fixedly connected to the side of the top cover 241 away from the slider 23 and the side of the bottom cover 243 away from the fixing block 21, respectively. The spring 244 is sleeved on the outside of the hydraulic rod 242, with both ends fixedly connected to the top cover 241 and the bottom cover 243, respectively. In the non-working state, the hydraulic rod 242 is not at its maximum stroke; that is, even when the spring 244 is extended, the hydraulic rod 242 can also extend accordingly. With the cooperation of the hydraulic oil inside the hydraulic rod 242 and the piston, the hydraulic rod 242 can effectively prevent the deformation speed of the spring 244, thus achieving a shock absorption effect.

[0038] The working principle of the shock absorption mechanism 2 is as follows: when the drill bit 4 is working, it will cause the drill rod body 1 to vibrate. The vibration of the drill rod body 1 will cause the slider 23 to vibrate. The hydraulic shock absorber 24 can effectively reduce and absorb the vibration of the slider 23, thereby alleviating the vibration of the connecting rod 25 and further alleviating the vibration of the fixing mechanism 3.

[0039] The fixing mechanism 3 is mounted on the shock-absorbing mechanism 2 and is used to fix the measuring instrument 5. For details, please refer to... Figure 3 and Figure 4 The fixing mechanism 3 is a frustum-shaped structure, with its axis roughly coinciding with the axis of the drill pipe body 1. The outer wall of the fixing mechanism 3 is hinged to the connecting rod 25. The fixing mechanism 3 is provided with a recess 31, and the recesses 31 of the two fixing mechanisms 3 are arranged opposite to each other. In other words, with Figure 2 For example, the top surface of the lower fixing mechanism 3 is provided with a recessed platform 31, and the bottom surface of the upper fixing mechanism 3 is provided with a recessed platform 31. Multiple clearance holes 32 for accommodating bolts 6 are equally spaced along the circumference of the recessed platform 31, and a through hole 33 is provided in the middle of the recessed platform 31.

[0040] Please refer to the following when using it. Figure 2 The upper and lower ends of the measuring instrument 5 are respectively fitted into the upper and lower recesses 31, and then the measuring instrument 5 is fixed to the fixing mechanism 3 with bolts 6. The signal line and power line of the measuring instrument 5 can extend to the outside of the drill rod body 1 through the through hole 33. During the operation of the drill bit 4, the shock absorption mechanism 2 can effectively reduce the vibration force of the drill rod body 1 on the measuring instrument 5, improve the service life of the measuring instrument 5, and prevent the measuring instrument 5 from falling off the drill rod body 1.

[0041] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A near-bit gamma measuring instrument, characterized in that, It includes the drill pipe body (1), the shock absorption mechanism (2), and the fixing mechanism (3); among which, The drill bit (4) is fixed at the bottom of the drill rod body (1). Two sets of the shock absorption mechanisms (2) are symmetrically arranged at intervals along the axial direction of the drill rod body (1) inside the drill rod body (1). The shock absorption mechanisms (2) are used for shock absorption and protection of the measuring instrument (5). Each group of damping mechanisms (2) includes multiple damping mechanisms (2) arranged at equal intervals along the circumference of the drill rod body (1); The shock absorption mechanism (2) includes a fixed block (21), a guide rod (22), a slider (23), a hydraulic shock absorber (24), and a connecting rod (25); wherein; The two fixing blocks (21) are fixedly mounted on the inner sidewall of the drill rod body (1) at intervals along the axial direction of the drill rod body (1); The two ends of the guide rod (22) are respectively fixedly connected to the two opposite sides of the two fixed blocks (21); The two sliders (23) are slidably sleeved on the guide rod (22); The two hydraulic shock absorbers (24) are arranged side by side with the guide rod (22), and the two hydraulic shock absorbers (24) are respectively arranged between the two sliders (23) and the two fixed blocks (21); One end of the connecting rod (25) is hinged to the slider (23), and the other end of the connecting rod (25) is hinged to the fixing mechanism (3); The fixing mechanism (3) is installed on the shock absorption mechanism (2) and is used to fix the measuring instrument (5).

2. The near-bit gamma measuring instrument according to claim 1, characterized in that, The hydraulic shock absorber (24) includes a top cover (241), a hydraulic rod (242), a bottom cover (243), and a spring (244). One side of the top cover (241) is fixedly connected to the slider (23); One side of the bottom cover (243) is fixedly connected to the fixing block (21); The two ends of the hydraulic rod (242) are respectively fixedly connected to the side of the top cover (241) away from the slider (23) and the side of the bottom cover (243) away from the fixing block (21); The spring (244) is sleeved on the outside of the hydraulic rod (242), and the two ends of the spring (244) are fixedly connected to the top cover (241) and the bottom cover (243) respectively.

3. The near-bit gamma measuring instrument according to claim 2, characterized in that, The fixing mechanism (3) is frustum-shaped. The outer wall of the fixing mechanism (3) is hinged to the connecting rod (25). The fixing mechanism (3) is provided with a recess (31). Multiple clearance holes (32) for accommodating bolts (6) are equally spaced in the recess (31) along its circumference. A through hole (33) is provided in the middle of the recess (31). The recesses (31) of the two fixing mechanisms (3) are arranged opposite to each other.

4. A near-bit gamma measuring instrument according to claim 3, characterized in that, The measuring instrument (5) is set between the two recesses (31) and connected to the fixing mechanism (3) by bolts (6).

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