Combined inclined hole reamer bit for small-caliber geological drilling

Abstract

The invention relates to the field of prospecting drilling tool accessories for geological drilling, engineering drilling and the like, in particular to a combined reamer bit in inclined hole reaming work. The combined inclined hole expanding drill bit for small-caliber geological drilling comprises a main expanding drill bit arranged at the front end and a front-end drill bit arranged behind the main expanding drill bit, and the main expanding drill bit is connected with the front-end drill bit through a guide rod. The small-caliber inclined hole reaming device has the remarkable effects that the problems that in original small-caliber inclined hole reaming work, eccentric wear is likely to happen, and abrasion is serious can be solved, and meanwhile the problem that a proper drill bit cannot be matched according to the drillability of a stratum is solved. Replaceability of the main reamer bit is achieved, inclined hole reaming abrasion resistance is enhanced, the reamer bit can adapt to different stratums, working efficiency is greatly improved, abrasion resistance is improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of prospecting drill tool accessories such as geological drilling and engineering drilling, and in particular to a combined hole enlarging drill bit used in the work of enlarging inclined holes. Background Art

[0002] At present, in the drilling of small-diameter inclined holes in geological drilling, different boreholes face different construction conditions and difficulties. Some boreholes must be constructed by reaming due to complex formations, inclined hole structure design or drilling process technology requirements, which requires the use of reaming drill bits. However, conventional reaming drill bits are prone to eccentric wear and rapid wear during inclined hole reaming work. At the same time, it is impossible to match the appropriate drill bit according to the drillability of the formation, resulting in low work efficiency, thus affecting the entire drilling cycle. Summary of the invention

[0003] In view of the above problems and shortcomings, the present invention provides a combined inclined hole expansion drill bit for small-diameter geological drilling.

[0004] The present invention is realized through the following technical scheme: a combined inclined hole reaming drill bit for small-diameter geological drilling, which includes a main reaming drill bit arranged at the front end and a front end drill bit arranged behind the main reaming drill bit, and the main reaming drill bit and the front end drill bit are connected by a guide rod.

[0005] As described above, a combined inclined hole reaming drill bit for small-diameter geological drilling is provided, wherein the outer side of the tail end of the main reaming drill bit is provided with an external thread for connecting the combined reaming drill bit to a drill pipe and a drill bit for use; the inner wall of the main reaming drill bit is provided with an internal thread for connecting a guide rod.

[0006] A combined inclined hole reaming drill bit for small-diameter geological drilling as described above, wherein the guide rod has a connecting thread at the top, which is inserted through the bottom end of the main reaming drill bit and connected with the internal thread of the main reaming drill bit; the outer wall of the guide rod is provided with main water holes symmetrically arranged and distributed; the bottom end of the guide rod is provided with auxiliary water holes; the outer wall of the guide rod is provided with symmetrically and evenly distributed hard alloy strips; the lower end of the guide rod is provided with a connecting thread, which is connected with the front end drill bit through a thread;

[0007] As described above, a combined inclined hole reaming drill bit for small-diameter geological drilling, wherein the front end drill bit is threadedly connected to the lower end of the guide rod through a thread; the front end bottom surface of the front end drill bit is evenly distributed with cutting tools and external water outlets in an annular shape.

[0008] As described above, a combined inclined hole reaming drill bit for small-diameter geological drilling, wherein the main reaming drill bit, the pilot body 2 and the front end drill bit are combined and used through threaded connection.

[0009] As described above, in the combined inclined hole reaming drill bit for small-caliber geological drilling, the cutting tool of the main reaming drill bit is impregnated diamond or diamond composite sheet.

[0010] As described above, in the combined inclined hole reaming drill bit for small-diameter geological drilling, the number of main water holes of the pilot rod is 4 to 8.

[0011] The combined inclined hole enlarging drill bit for small-diameter geological drilling as described above has an adjustable diameter of the auxiliary water hole at the bottom end of the pilot rod.

[0012] As described above, in the combined inclined hole enlarging drill bit for small-caliber geological drilling, the cutting tool of the front end drill bit is impregnated diamond or diamond composite sheet.

[0013] The significant effect of the present invention is that the device of the present invention can solve the problems of eccentric wear and severe wear in the original small-diameter inclined hole expansion work, and solve the problem of not being able to match a suitable drill bit according to the drillability of the formation. The main expansion drill bit is replaceable, the wear resistance of the inclined hole expansion is enhanced, and it can adapt to different formations to greatly improve work efficiency, wear resistance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of a combined inclined hole expansion drill bit for small-caliber geological drilling;

[0015] Figure 2 It is a cross-sectional schematic diagram of a combined inclined hole enlarging drill bit for small-caliber geological drilling;

[0016] Figure 3 It is the right side view of a combined inclined hole expansion drill bit for small-diameter geological drilling.

[0017] In the figure, 1 is a main reaming drill bit, 2 is a guide rod, 3 is a front end drill bit, 4 is a main water hole, 5 is a secondary water hole, 6 is an external thread of the main reaming drill bit, 7 is an external water outlet of the main reaming drill bit, 8 is an external water outlet of the front end drill bit, 9 is a cutting tool of the main reaming drill bit, 10 is a cutting tool of the front end drill bit, 11 is a carbide strip on the outer wall of the guide rod, 12 is an internal thread of the main reaming drill bit, 13 is a connecting thread at the upper end of the guide rod, and 14 is a connecting thread at the lower end of the guide rod. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific implementation contents.

[0019] A combined inclined hole reaming drill bit for small-diameter geological drilling, comprising a main reaming drill bit, a pilot rod and a front-end pilot drill bit. The main reaming drill bit is a diamond or composite drill bit with a thickened inner wall for geological drilling, and the bottom lip surface has water outlets evenly distributed; the tail end of the main reaming drill bit is provided with an external thread and an internal thread, the external thread is used to connect the geological drilling tool, and the internal thread is used to connect the pilot rod; the pilot rod is a rod with threads at both ends, with a through hole inside and symmetrical water holes on the side wall; cemented carbide is embedded above the water holes on the side wall of the pilot rod; the front-end pilot reaming drill bit is connected to the top of the pilot rod through the internal thread, and the bottom end of the pilot rod is connected to the internal thread of the main reaming drill bit after being penetrated by the bottom end of the main reaming drill bit.

[0020] The cutting lip surface of the main reaming drill bit is impregnated with diamond or diamond composite sheet;

[0021] The main reaming drill bit is a special geological coring drill bit with a thickened inner wall, but the drill bit has no inner cutting edge part and other internal diameter-protecting parts;

[0022] The main reaming drill bit, the guide rod and the front end drill bit are combined by threaded connection;

[0023] The longitudinal projection ranges of the threads of the outer thread and the inner thread of the main reaming drill bit do not overlap.

[0024] The outer diameter of the pilot rod should be 0.5-1 mm smaller than the inner diameter of the main reaming drill bit, so that it has good tightness and connection without creating too much space;

[0025] The side wall of the guide rod is provided with a main water hole for removing rock powder, and the bottom end is provided with an auxiliary water hole for lubricating the front drill bit, and the number of the auxiliary water hole is 1;

[0026] The number of main water holes on the side wall of the pilot rod is 4 to 8, and corresponds to the number and position of the water holes of the main reaming drill bit;

[0027] The outer wall of the guide rod is inlaid with 4 hard alloy strips which are symmetrically distributed and extend from the top of the main reaming drill cutting tool to the thread at the bottom end of the guide rod.

[0028] Here is a specific example

[0029] The present invention provides a combined inclined hole reaming drill bit for small-diameter geological drilling, comprising: a main reaming drill bit 1, the front end bottom surface of the main reaming drill bit is evenly distributed with cutting tools 9 and external water outlets 7 in a ring shape; the outer side of the tail end of the main reaming drill bit 1 is provided with an external thread 6 for connecting the combined reaming drill bit to a drill pipe and a drill tool for use; the inner wall of the main reaming drill bit 1 is provided with an internal thread 12 for connecting a guide rod 2.

[0030] The guide rod 2 is characterized in that a connecting thread 13 is provided at the top end, which is connected to the internal thread 12 of the main reaming drill bit after being penetrated by the bottom end of the main reaming drill bit; the outer wall of the guide rod 2 is provided with main water holes 4 that are symmetrically arranged and distributed; the bottom end of the guide rod 2 is provided with auxiliary water holes 5; the outer wall of the guide rod is provided with symmetrically and evenly distributed hard alloy strips 11; the lower end of the guide rod is provided with a connecting thread 14, which is threadedly connected to the front end drill bit 3.

[0031] The front end drill bit 3 is characterized in that it is connected to the lower end thread 14 of the guide rod 2 through a thread; the front end bottom surface of the front end drill bit 3 is evenly distributed with cutting tools 10 and external water outlets 8 in a ring shape.

[0032] In this embodiment, the main reaming drill bit 1, the guide body 2 and the front end drill bit 3 are combined by threaded connection; the cutting tool 9 of the main reaming drill bit 1 is impregnated with diamond, which can be adjusted to a diamond composite sheet according to the drillability of the formation when in use; the number of main water holes 4 of the guide rod 2 is 4 to 8, which can be adjusted according to the working environment; the diameter of the secondary water hole 5 at the bottom end of the guide rod 2 can be adjusted according to the flow demand; the cutting tool 10 of the front end drill bit 3 is impregnated with diamond, which can be adjusted to a diamond composite sheet according to the drillability of the formation when in use.

[0033] The combined inclined hole reaming drill bit for small-diameter geological drilling of the present invention is used for the reaming of inclined holes in geological drilling work, and solves the problems of eccentric wear, rapid wear, and easy falling off of the reaming tool in the original small-diameter inclined hole reaming work of geological drilling, and realizes the replaceability of the main reaming drill bit according to the characteristics of the formation, and can reaming holes in one time, which can greatly improve work efficiency and reduce labor intensity and auxiliary time. The present invention has strong wear resistance during work, stable and reliable structure, is not easy to fall off during work, has strong adaptability, is easy to operate, and is convenient for inspection and maintenance, and has wide practicality.

Claims

1. A combined inclined hole enlarging drill bit for small-caliber geological drilling, characterized in that: It comprises a main reaming drill bit (1) arranged at the front end and a front end drill bit (3) arranged behind the main reaming drill bit (1); the main reaming drill bit (1) and the front end drill bit (3) are connected via a guide rod (2).

2. A combined inclined hole enlarging drill bit for small-diameter geological drilling according to claim 1, characterized in that: The outer side of the tail end of the main reaming drill bit (1) is provided with an external thread (6) for connecting the combined reaming drill bit to a drill rod and a drill bit for use; the inner wall of the main reaming drill bit (1) is provided with an internal thread (12) for connecting to a guide rod (2).

3. A combined inclined hole enlarging drill bit for small-diameter geological drilling according to claim 2, characterized in that: The guide rod (2) has a connecting thread (13) at the top end thereof, which is connected to the internal thread (12) of the main reaming drill bit after being inserted through the bottom end thereof; the outer wall of the guide rod (2) is provided with main water holes (4) which are symmetrically arranged and distributed; the bottom end of the guide rod (2) is provided with auxiliary water holes (5); the outer wall of the guide rod is provided with symmetrically and evenly distributed hard alloy strips (11); the lower end of the guide rod is provided with a connecting thread (14), which is connected to the front end drill bit (3) through a thread.

4. A combined inclined hole enlarging drill bit for small-diameter geological drilling as claimed in claim 3, characterized in that: The front end drill bit (3) is connected to the lower end thread (14) of the guide rod (2) through a thread; the front end bottom surface of the front end drill bit (3) is evenly distributed with cutting tools (10) and external water outlets (8) in an annular shape.

5. A combined inclined hole enlarging drill bit for small-diameter geological drilling as claimed in claim 4, characterized in that: The main reaming drill bit (1), the pilot body 2 and the front end drill bit (3) are connected by threads and used in combination.

6. A combined inclined hole enlarging drill bit for small-diameter geological drilling as claimed in claim 5, characterized in that: The cutting tool (9) of the main hole-reaming drill bit (1) is a diamond-impregnated or diamond-composite sheet.

7. A combined inclined hole enlarging drill bit for small-diameter geological drilling according to claim 6, characterized in that: The number of the main water holes (4) of the guide rod (2) is 4 to 8.

8. A combined inclined hole enlarging drill bit for small-diameter geological drilling according to claim 7, characterized in that: The diameter of the auxiliary water hole (5) at the bottom end of the guide rod is adjustable.

9. A combined inclined hole enlarging drill bit for small-diameter geological drilling according to claim 8, characterized in that: The cutting tool (10) of the front end drill bit (3) is a diamond-impregnated or diamond composite sheet.

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