Flexible steering coring drill tool

Abstract

The present application relates to the technical field of geological exploration, and provides a flexible steering coring drill tool. The flexible steering coring drill tool comprises a steering drill bit (1), a reamer (2), a stabilizer (4), and a plurality of coring drill rods (3). The steering drill bit (1) comprises a connecting portion (11) and a cutting portion (12) arranged at one end of the connecting portion (11); the reamer (2) is arranged at the end of the connecting portion (11) distant from the cutting portion (12); one of the coring drill rods (3) is arranged at the end of the reamer (2) distant from the steering drill bit (1), and the remaining coring drill rods (3) are sequentially connected to the coring drill rod (3) connected to the reamer (2); the stabilizer (4) is arranged on the coring drill rod (3) connected to the reamer (2); and the outer diameter of the reamer (2) is greater than the outer diameter of the cutting portion (12), the outer diameter of the stabilizer (4) is smaller than the outer diameter of the cutting portion (12), and the difference between the outer diameter of the coring drill rod (3) and the outer diameter of the cutting portion (12) is greater than 15 mm. In the present application, a drilling direction of the drill bit can be changed during drilling and coring, so that rock cores from river bottom and opposite valley areas can be conveniently obtained, and the coring process can be conveniently completed without constructing an auxiliary platform over a river surface.

Description

Flexible guide coring drill TECHNICAL FIELD

[0001] The present application relates to the technical field of geological exploration, in particular to a flexible guide coring drill. BACKGROUND

[0002] With the implementation of energy, transportation, national water network and other strong country strategies, China's infrastructure construction is booming, and the number, scale and difficulty of major engineering construction have increased significantly. Major engineering construction is mostly located in the extremely complex topography and geological conditions of the western mountainous area, facing the extreme geological environment of high altitude, high buried depth, high stress, high water pressure and large drop, and directional coring drilling faces major challenges.

[0003] For high-altitude and large-drop areas, especially the exploration drilling at the bottom of a kilometer-level deep valley, due to the difficulty or even inability to relocate some large-scale engineering exploration equipment, and the difficulty in effectively building auxiliary platforms on the river surface, it is difficult to take cores from the river bottom and the opposite valley. SUMMARY

[0004] The purpose of the present application is to provide a flexible guide coring drill which can change the drilling direction of the drill bit during the coring process, so as to obtain the core of the river bottom and the opposite valley area, without the need to build auxiliary platforms on the river surface to facilitate the coring process.

[0005] The embodiment of the present application is realized by the following technical scheme: a flexible guide coring drill, comprising: a guide drill bit, the guide drill bit comprising a connecting portion and a cutting portion provided at one end of the connecting portion; a reamer provided at one end of the connecting portion away from the cutting portion; a plurality of coring drill rods, one of the coring drill rods being provided at one end of the reamer away from the guide drill bit, and the remaining coring drill rods being connected to the coring drill rod connected to the reamer in turn; a stabilizer provided on the coring drill rod connected to the reamer; the outer diameter of the reamer is greater than the outer diameter of the cutting portion, the outer diameter of the stabilizer is less than the outer diameter of the cutting portion, and the difference between the outer diameter of the coring drill rod and the outer diameter of the cutting portion is greater than 15mm.

[0006] Further, the outer diameter of the cutting portion of the guide drill bit is 99mm, and the outer diameter of the coring drill rod is 72mm.

[0007] Further, the wall thickness of the coring drill rod is greater than 7.8mm.

[0008] Further, the outer diameter of the stabilizer is 97mm.

[0009] Further, the stabilizer is slidingly provided on the coring drill rod and detachably connected to the coring drill rod.

[0010] Further, a connecting bolt is arranged on the stabilizer, and a plurality of threaded holes for inserting the connecting bolt are formed on the coring drill rod.

[0011] Further, the two adjacent coring drill rods are connected through threads.

[0012] The technical scheme of the embodiment of the present application has at least the following advantages and beneficial effects:

[0013] 1. The outer diameter of the stabilizer is smaller than that of the cutting part of the guide drill bit, and the difference between the outer diameter of the coring drill rod and that of the cutting part is greater than 15 mm, so that the stabilizer can serve as a rotating fulcrum during drilling, and the guide drill bit can be tilted upward by a certain angle, thereby changing the drilling direction, and changing the straight hole with an unchanged inclination angle into an arc-shaped hole with a changed inclination angle, so as to pass through the riverbed of a kilometer-level river.

[0014] 2. The coring drill rod with an outer diameter of 72 mm can be used with the existing geological coring equipment, and the strength of the coring drill rod can be improved by increasing the wall thickness and thread pitch of the coring drill rod, so as to avoid the fracture of the coring drill rod. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation on the scope, and other related drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0016] Fig. 1 is a schematic diagram of the overall structure of the flexible guide coring drill tool provided by the present application;

[0017] Fig. 2 is a schematic diagram of the connection structure of the guide drill bit, the reamer, the stabilizer and one of the coring drill rods;

[0018] Fig. 3 is a schematic diagram of the use state of the flexible guide coring drill tool;

[0019] Fig. 1 is a schematic diagram of the overall structure of the flexible guide coring drill tool provided by the present application; DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0022] Embodiment 1

[0023] The present application is a flexible guide coring drill tool, which comprises a guide drill bit 1, a reamer 2, a stabilizer 4 and a plurality of coring drill rods 3. The guide drill bit 1 comprises a connecting part 11 and a cutting part 12 arranged at one end of the connecting part 11. The end of the connecting part 11 away from the cutting part 12 is provided with an internal thread, and the end of the reamer 2 is provided with an external thread and is threadedly connected to the internal thread of the connecting part 11. The end of one of the coring drill rods 3 is provided with an external thread and is threadedly connected to the internal thread of the reamer 2, and the remaining plurality of coring drill rods 3 are sequentially connected to the coring drill rod 3 connected to the reamer 2. The end of each coring drill rod 3 towards the guide drill bit 1 is provided with an external thread, and the end away from the guide drill bit 1 is provided with a threaded hole. The positioning between the adjacent two coring drill rods 3 is achieved in a threaded connection manner. The stabilizer 4 is installed on the coring drill rod 3 connected to the reamer 2.

[0024] The outer diameter of the reamer 2 is greater than the outer diameter of the cutting part 12. After the cutting part 12 completes the drilling, the reamer 2 can effectively remove the coal residue or other obstacles in the collapsed hole to avoid accidents such as sticking and burying of the drill, and can gradually expand the diameter of the hole during the drilling process to meet the specific engineering requirements.

[0025] The coring drill rod 3 is internally configured with a rope coring mechanism (not shown in the figure). The coring drill rod 3 in the borehole does not need to be lifted to the ground surface, but completes the coring process in the coring drill rod 3 by means of a professional rope fishing tool, thereby reducing the number of lifting and lowering of the drill tool, shortening the auxiliary time and improving the drilling efficiency.

[0026] The outer diameter of the stabilizer 4 is smaller than the outer diameter of the cutting part 12, and the difference between the outer diameter of the coring drill rod 3 and the outer diameter of the cutting part 12 is greater than 15 mm. In the prior art, the diameter of the stabilizer 4 is usually as equal as possible to the diameter of the cutting part 12, which maximally restricts the lateral swing of the pilot drill bit 1 and makes it drill along the specified trajectory. In the embodiment, the direction of the pilot drill bit 1 needs to be changed during drilling, that is, the pilot drill bit 1 needs to be tilted downward in the initial state, and then the tilt angle of the pilot drill bit 1 needs to be changed so that the tilt angle between the drilling hole and the horizontal plane gradually decreases during drilling, so that the coring drill rod 3 can pass through the bottom of the riverbed of the kilometer-level river and reach the bottom of the opposite valley to achieve the purpose of coring the riverbed and the opposite valley. Therefore, in the embodiment, the outer diameter of the stabilizer 4 is reduced so that the stabilizer 4 can serve as a rotating fulcrum in the drilling hole, and the multiple coring drill rods 3 will move downward under the action of their own gravity and adhere to the inner wall of the drilling hole, so that the pilot drill bit 1 is tilted upward, and the tilt angle between the drilling hole and the horizontal plane gradually decreases during subsequent drilling to facilitate passing through the riverbed of the kilometer-level river.

[0027] In the prior art, the difference between the outer diameter of the pilot drill bit 1 and the outer diameter of the coring drill rod 3 is 10 mm, which ensures the reasonable matching between the pilot drill bit 1 and the coring drill rod 3, reduces equipment loss, and improves drilling efficiency. For example, if the outer diameter of the cutting part 12 of the pilot drill bit 1 is 99 mm, a drill rod with an outer diameter of 89 mm is usually configured, but in the embodiment, the outer diameter of the cutting part 12 of the pilot drill bit 1 is 99 mm, and a coring drill rod 3 with an outer diameter of 72 mm is selected, and the difference between the outer diameter of the cutting part 12 and the outer diameter of the coring drill rod 3 is 27 mm. By reducing the outer diameter of the coring drill rod 3, the difference between the outer diameter of the coring drill rod 3 and the outer diameter of the cutting part 12 is increased, so that the coring drill rod 3 has enough space in the drilling hole to tilt the pilot drill bit 1 upward, thereby achieving the predetermined drilling trajectory. Since the coring drill rod 3 of the geological coring equipment has a fixed specification, the coring drill rod 3 with an outer diameter of 72 mm can be used with the existing geological coring equipment without the need for custom production of new equipment, thereby reducing the production cost of the equipment.

[0028] In the prior art, the wall thickness of the coring drill rod 3 is 7.8 mm, and in the embodiment, the wall thickness of the coring drill rod 3 is greater than 7.8 mm, specifically 8.8 mm-9.3 mm, which increases the strength of the coring drill rod 3 to prevent it from breaking. At the same time, the length and pitch of the internal and external threads of the coring drill rod 3 are optimized accordingly to improve the overall strength of the multiple coring drill rods 3 after being combined, which increases the maximum torque and tensile strength compared to the existing ordinary coring drill rod 3, and makes the coring drill rod 3 less prone to breaking.

[0029] The outer diameter of the stabilizer 4 in the embodiment is 97 mm. Compared with the prior art in which the outer diameter of the stabilizer 4 is equal to the outer diameter of the pilot bit 1, the embodiment reduces the outer diameter of the stabilizer 4, so that the stabilizer 4 has a space for adaptive swing while serving as the rotation fulcrum of the whole structure of the coring drill string, thereby realizing the change of the drilling direction of the coring drill pipe 3.

[0030] The stabilizer 4 is slidingly installed on the coring drill pipe 3 and detachably connected with the coring drill pipe 3. In the embodiment, the stabilizer 4 is provided with connecting bolts 41, and the coring drill pipe 3 is provided with a plurality of threaded holes for inserting the connecting bolts 41. The stabilizer 4 is detachably installed on the coring drill pipe 3 by means of bolt connection, so that the position of the rotation fulcrum of the whole structure can be adjusted, thereby enabling the drilling direction of the pilot bit 1 to be adjusted according to the actual situation on site. In other embodiments, the stabilizer 4 can be installed on the coring drill pipe 3 by welding. When the position of the stabilizer 4 needs to be changed, the new coring drill pipe 3 and stabilizer 4 connected with the reamer 2 are replaced, and the welding position of the stabilizer 4 on the coring drill pipe 3 is changed.

[0031] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible pilot core drill, characterized in that, The application relates to a drilling device, comprising: a pilot drill bit (1) comprising a connecting part (11) and a cutting part (12) arranged at one end of the connecting part (11); a reamer (2) arranged at one end of the connecting part (11) away from the cutting part (12); a plurality of core drill rods (3), wherein one of the core drill rods (3) is arranged at one end of the reamer (2) away from the pilot drill bit (1), and the rest of the core drill rods (3) are sequentially connected to the core drill rod (3) connected to the reamer (2); a stabilizer (4) arranged on the core drill rod (3) connected to the reamer (2); an outer diameter of the reamer (2) is greater than that of the cutting part (12), an outer diameter of the stabilizer (4) is smaller than that of the cutting part (12), and a difference between the outer diameter of the core drill rod (3) and that of the cutting part (12) is greater than 15 mm; an outer diameter of the cutting part (12) of the pilot drill bit (1) is 99 mm, and an outer diameter of the core drill rod (3) is 72 mm; a wall thickness of the core drill rod (3) is greater than 7.8 mm; an outer diameter of the stabilizer (4) is 97 mm; the stabilizer (4) is sleeved on the core drill rod (3) and detachably connected to the core drill rod (3).

2. The flexible directional coring drill tool of claim 1, wherein: A connecting bolt (41) is arranged on the stabilizer (4), and a plurality of threaded holes for inserting the connecting bolt (41) are formed in the core drill rod (3).

3. The flexible directional coring drill tool of claim 1, wherein: Two adjacent core drill rods (3) are connected through threads.

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