Drill rod orienting device

Abstract

The utility model relates to the technical field of drilling equipment, and discloses a drill rod orienting device which comprises a drill rod, at least two sets of straightness keeping structures are arranged on the rod wall of the drill rod, and the straightness keeping structures are arranged on the drill rod. Each straightness maintaining structure comprises a plurality of blades fixed to the outer wall of the drill rod, and the blades of each straightness maintaining structure are annularly distributed along the outer wall of the drill rod. According to the invention, the edges of the blades are in contact with the wall of a drill hole, so that the drill rod is supported, the straightness of the drill rod and the drill bit is kept, and the phenomenon of drill hole deviation caused by the change of the weight of the drill bit, geological conditions, feeding force and the like is avoided; and more than two groups of supporting structures form a double-insurance mechanism, so that the drill rod and a drill bit are always kept in a straight line in the drilling process of the drill rod, and the problem of deviation of the drill rod in the construction process is well solved.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology and discloses a drill pipe orientation device. Background Technology

[0002] During the coal mining drilling process, the anti-scouring team used the ZDY4600LX coal mine tunnel drilling rig for the drilling of the control holes. This rig is equipped with a 73.5mm drill rod and a 153mm drill bit. However, due to the drilling depth, the weight of the drill bit, and the unstable geological structure, the drilling process caused the hole to run away and fail to meet the design requirements. Utility Model Content

[0003] The purpose of this utility model is to provide a drill rod orientation device that can support the drill rod and maintain the straightness of the drill rod and drill bit, preventing borehole deviation due to changes in drill bit weight, geological conditions, and feed force, thus solving the problem of drill rod deviation during construction.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by this utility model is as follows:

[0005] A drill pipe orientation device includes a drill pipe, and a straightness maintaining structure is provided on the wall of the drill pipe. There are at least two sets of straightness maintaining structures on the drill pipe. Each set of straightness maintaining structures includes multiple blades fixed to the outer wall of the drill pipe, and the blades of each set of straightness maintaining structures are distributed circumferentially along the outer wall of the drill pipe.

[0006] Furthermore, the number of blades in each straightness-maintaining structure is 3 to 6.

[0007] Furthermore, a set of straightness-maintaining structures is installed on the drill pipe near the drill bit and the tail end, respectively.

[0008] Furthermore, the axial distance between the straightness maintenance structure near the tail of the drill pipe and the straightness maintenance structure near the drill bit is 1 / 3 to 2 / 3 of the length of the drill pipe.

[0009] Furthermore, the blade is connected to the drill pipe by welding or bolting.

[0010] Furthermore, the outer surface of the blade is provided with a wear-resistant coating to reduce frictional wear with the borehole wall.

[0011] Furthermore, the ratio of the diameter of the drill pipe to the maximum outer diameter of the blade is 1:(1.2 to 1.5).

[0012] Furthermore, the blades of each set of straightness-maintaining structures are spirally and inclinedly installed at corresponding positions on the outer wall of the drill pipe.

[0013] Furthermore, the tilting direction of the blade is the same as the rotation direction of the drill pipe during drilling.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model sets up a straightness maintenance structure that is evenly distributed in a circumferential direction on the drill rod wall. Each set of straightness maintenance structures includes multiple blades fixed to the outer wall of the drill rod. The blade edges contact the borehole wall to support the drill rod and maintain the straightness of the drill rod and drill bit. This prevents borehole deviation due to changes in drill bit weight, geological conditions, and feed force. Moreover, with at least two sets of straightness maintenance structures on the drill rod, the two or more sets of support structures form a "double insurance" mechanism, ensuring that the drill rod and drill bit always remain in a straight line during the drilling process, effectively solving the problem of drill rod deviation during construction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the drill pipe orientation device.

[0016] Among them, 1. drill pipe; 2. blade; 3. drill bit. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] Example

[0019] See Figure 1 A drill pipe orientation device includes a drill pipe 1, on which a straightness maintaining structure is provided. The straightness maintaining structure on the drill pipe 1 is provided in at least two sets. Each set of straightness maintaining structure includes multiple blades 2 fixed to the outer wall of the drill pipe 1. The blades 2 of each set of straightness maintaining structure are distributed circumferentially along the outer wall of the drill pipe 1.

[0020] In this embodiment, by setting a circumferentially evenly distributed straightness-maintaining structure on the wall of the drill rod 1, each set of straightness-maintaining structures includes multiple blades 2 fixed to the outer wall of the drill rod 1. The blades 2 contact the borehole wall through their edges to support the drill rod 1 and maintain the straightness of the drill rod 1 and the drill bit 3. This prevents borehole deviation due to changes in the weight of the drill bit 3, geological conditions, and feed force. Moreover, by using at least two sets of straightness-maintaining structures on the drill rod 1, the two or more sets of support structures form a "double insurance" mechanism, ensuring that the drill rod 1 and the drill bit 3 always remain in a straight line during the drilling process, effectively solving the problem of drill rod 1 deviation during construction.

[0021] In this embodiment, the number of blades 2 in each straightness-maintaining structure is 3 to 6. Three blades form the minimum stable support plane, and six blades achieve the optimal support density balance. On the one hand, this avoids the slag discharge channel from being blocked by too many blades 2, and ensures that a uniform support angle of 60° to 120° is formed between each blade 2, eliminating support blind spots.

[0022] In this embodiment, a set of straightness-maintaining structures is respectively provided on the drill pipe 1 near the drill bit 3 and the tail end. The front set near the drill bit 3 prevents initial deviation, while the rear set supports the tail end of the drill pipe 1 to form a torque balance, suppressing the whip-like effect of the drill pipe 1, correcting residual deviations, and further ensuring that the drill pipe 1 and the drill bit 3 always remain in a straight line during the drilling process.

[0023] Relevant practical applications have proven that the first 1 / 3 of the drill pipe 1 bears 80% of the bending stress. Therefore, in this embodiment, the axial distance between the straightness maintenance structure near the tail of the drill pipe 1 and the straightness maintenance structure near the drill bit 3 is 1 / 3 to 2 / 3 of the length of the drill pipe 1. The 1 / 3 spacing ensures that the support covers the critical bending section, and the 2 / 3 spacing forms the optimal leverage ratio, maximizing the correction torque.

[0024] The blade 2 and drill pipe 1 can be formed as one piece or as separate pieces. Separate forming can be achieved by welding or by bolt fixing. The advantage of bolt fixing is that the blade 2 can be replaced in time when it is worn out, thus protecting the drill pipe 1.

[0025] In this embodiment, the outer surface of the blade 2 is provided with a wear-resistant coating to reduce frictional wear between the blade 2 and the borehole wall, thereby further improving the service life of the blade 2.

[0026] In this embodiment, the ratio of the diameter of the drill rod 1 to the maximum outer diameter of the blade 2 is 1:(1.2~1.5), which can ensure the minimum effective support gap, ensure the stable discharge of drill cuttings, and avoid the problem of excessive hole wall size deviation caused by excessive hole enlargement.

[0027] In this embodiment, the blades 2 of each set of straightness-maintaining structures are spirally and inclinedly installed at corresponding positions on the outer wall of the drill pipe 1. By setting the spiral direction of the blades 2, the spiral angle of the blades 2 generates an axial component force during the drilling process of the drill pipe 1, which is beneficial to further suspend drill cuttings and improve cuttings removal efficiency.

[0028] In this embodiment, the tilting direction of the blade 2 is the same as the rotation direction of the drill rod 1 during drilling, so that the blade 2 structure has both straightness maintenance and slag removal functions, forming a self-cleaning effect, preventing the accumulation of drill slag or rock cuttings, and breaking through the limitation of the single function of traditional stabilizers.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drill pipe orienting device, characterized by, The application relates to a drill rod (1) provided with straightness-keeping structures on the rod wall, wherein the straightness-keeping structures on the drill rod (1) are at least two groups; each group of straightness-keeping structures comprises a plurality of blades (2) fixed on the outer wall of the drill rod (1), and the blades (2) of each group of straightness-keeping structures are distributed along the outer wall of the drill rod (1) in a ring shape.

2. The drill pipe orienting device of claim 1, wherein, The number of blades (2) in each group of straightness-keeping structures is 3-6.

3. The drill pipe orienting device of claim 1, wherein, A group of straightness-keeping structures is arranged on the drill rod (1) near the drill bit (3) and the tail part respectively.

4. The drill pipe orienting device of claim 3, wherein, The axial distance between the straightness-keeping structure near the tail part of the drill rod (1) and the straightness-keeping structure near the drill bit (3) is 1 / 3-2 / 3 of the length of the drill rod (1).

5. The drill pipe orienting device of claim 1, wherein, The connection mode of the blades (2) and the drill rod (1) is welding or bolt fixing.

6. The drill pipe orienting device of claim 1, wherein, The outer surface of the blades (2) is provided with a wear-resistant coating for reducing the friction loss with the drilling wall.

7. The drill pipe orienting device of claim 1, wherein, The ratio of the diameter of the drill rod (1) to the maximum outer diameter of the blades (2) is 1:(1.2-1.5).

8. The drill pipe orienting device of claim 1, wherein, The blades (2) of each group of straightness-keeping structures are installed in a corresponding position on the outer wall of the drill rod (1) in a spiral manner.

9. The drill string orienting apparatus of claim 1, wherein, The inclination direction of the blades (2) is the same as the rotating direction of the drill rod (1) during drilling.

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