An internal drive coring drill bit for deep sea drilling

Abstract

The present invention discloses an internally driven coring drill bit for deep-sea drilling, which relates to the technical field of deep-sea drilling and comprises a drill head and a joint portion; an axial hollow channel is formed inside the drill head, and the drill head comprises an upper joint, a rotating seat and a drill bit connected in sequence from top to bottom; the upper joint is fixedly connected to the non-rotating part of the rotating seat, and the drill bit is fixedly connected to the rotating part of the rotating seat, so that the drill bit can rotate relative to the upper joint; a clamping groove is provided on the connection between the rotating part and the drill bit located inside the hollow channel; the joint portion is inserted into the hollow channel of the drill head, and the outer wall of the joint portion has an elastic protrusion, which is clamped in the clamping groove. The present invention can ensure that the upper drill string assembly does not move when the drill bit is rotated and drilled by a bottom hole power drill tool; diamond drill bits or PDC drill bits can be used in deep-sea coring operations, thereby increasing the life of the drill bit in hard rock drilling, reducing the frequency of drilling and changing the drill bit, and effectively improving operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of deep sea drilling, and more particularly to an internally driven coring drill bit for deep sea drilling. Background Art

[0002] In deep-sea drilling, especially during coring operations, the drill string is exposed to seawater and cannot rotate at high speeds. Conventional downhole power tools, such as screws and turbines, are not hollow structures and cannot provide a channel for lowering and withdrawing wireline coring tools. Therefore, roller bits are commonly used. When using roller bits for coring operations, the internal diameter of the drill bit is small, making it difficult to obtain large cores. Furthermore, when drilling into hard seabed rock, roller bits have a short lifespan and require frequent bit changes, which seriously affects operational efficiency.

[0003] Therefore, how to provide an internally driven coring drill bit to effectively improve operating efficiency is a problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides an internally driven coring drill bit for deep-sea drilling, aiming to solve the above-mentioned technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An internal drive coring drill bit for deep sea drilling, comprising: a drill head and a joint;

[0007] An axial hollow channel is formed inside the drill head, and the drill head includes an upper joint, a rotating seat, and a drill bit connected in sequence from top to bottom. The upper joint is fixedly connected to the non-rotating member of the rotating seat, and the drill bit is fixedly connected to the rotating member of the rotating seat so that the drill bit can rotate relative to the upper joint. A clamping groove is provided at the connection between the rotating member and the drill bit located inside the hollow channel.

[0008] The joint part is inserted into the hollow channel of the drill head part, and the outer side wall of the joint part is provided with an elastic protrusion, and the elastic protrusion is clamped in the clamping groove.

[0009] Through the above technical solution, the present invention provides a rotating seat, which allows the upper drill string assembly to remain stationary when the drill bit is rotated and drilled by the bottom hole power drill tool; an internally driven drill bit is formed by connecting the joint part and the drill bit, and a diamond drill bit or a PDC drill bit can be used in deep-sea drilling and coring operations, thereby increasing the life of the drill bit in hard rock drilling, reducing the frequency of drilling and changing the drill bit, and effectively improving the operation efficiency. The internally driven drill bit in the present invention effectively solves the problem that diamond drill bits cannot be used in deep-sea drilling due to low rotation speed.

[0010] Preferably, in the above-mentioned internally driven coring drill bit for deep-sea drilling, the rotating seat includes an inner shaft, and an upper bearing, a suspension joint, and a lower bearing that are sequentially sleeved on the outer side wall of the inner shaft from top to bottom. A fastening bolt is connected to the outer side wall of the bottom end of the inner shaft. The fastening bolt tightens the non-rotating ends of the lower bearing and the upper bearing against the bottom end of the upper joint. The suspension joint clamps the rotating ends of the lower bearing and the upper bearing. The bottom end of the suspension joint is fastened with a spring-loaded joint by a thread. The snap-fitting groove is formed on the inner side wall where the spring-loaded joint is connected to the drill bit. By providing the upper and lower bearings, the upper drill string assembly can remain stationary when the drill bit is rotated and drilled by the bottom hole power drilling tool.

[0011] Preferably, in the above-mentioned internally driven coring drill bit for deep-sea drilling, the joint portion includes a support sleeve, a cotter pin, a spring clip, and a tension spring; the support sleeve is sleeved in the hollow channel at intervals, and the side wall has a spring clip hole; the two ends of the cotter pin are radially fixed to the side wall of the support sleeve, and there are two spring clips, one end of each of the two spring clips is sleeved on the outside of the cotter pin, and the other end corresponds to the spring clip hole; the tension spring is fixed between the two spring clips, so that the two spring clips extend out of the spring clip hole and engage with the engaging groove. The tension spring causes the spring clip to open to a certain angle and form a match with the spring clip block of the drill bit part, and the torque of the downhole power tool is ultimately transmitted to the drill bit through the conversion joint, the spring clip, and the spring clip block.

[0012] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides an internally driven coring drill bit for deep-sea drilling, which has the following beneficial effects:

[0013] 1. The upper bearing and the lower bearing are provided in the present invention, so that the upper drill string assembly can remain stationary when the drill bit is rotated by the bottom hole power drilling tool, effectively solving the problem that diamond drill bits cannot be used in deep sea drilling due to low rotation speed.

[0014] 2. The present invention forms an internally driven drill bit by connecting the joint part with the drill bit. Diamond drill bits or PDC drill bits can be used in deep-sea coring operations, thereby increasing the life of the drill bit in hard rock drilling, reducing the frequency of drill bit replacement, and effectively improving operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 The accompanying drawing is a cross-sectional view of the structure of an internally driven coring drill bit for deep-sea drilling provided by the present invention;

[0017] Figure 2 The accompanying drawing is a cross-sectional view of the structure of the drill head provided by the present invention;

[0018] Figure 3 The accompanying drawing is a structural cross-sectional view of the joint portion provided by the present invention;

[0019] Figure 4 The accompanying drawing is a cross-sectional view of the structure of the spring-loaded connector provided by the present invention;

[0020] Figure 5 The accompanying drawing is a structural cross-sectional view of the drill bit provided by the present invention.

[0021] in:

[0022] 100-drill head; 200-connector;

[0023] 1-upper joint; 2-inner shaft; 3-suspension joint; 4-fastening bolt; 5-spring-clip joint; 6-upper bearing; 7-lower bearing; 8-stopper; 9-drill bit; 10-conversion joint; 11-inner tube; 12-cotter pin; 13-spring-clip; 14-tension spring; 15-outer tube; 16-hollow channel; 17-first annular seat; 18-second annular seat; 19-annular groove; 20-spring-clip hole; 21-support sleeve. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See attached Figure 1 , an embodiment of the present invention discloses an internal drive coring drill bit for deep sea drilling, comprising: a drill portion 100 and a joint portion 200;

[0026] An axial hollow passage 16 is formed inside the drill head 100. The drill head 100 includes an upper joint 1, a rotating base, and a drill bit 9 connected in sequence from top to bottom. The upper joint 1 is fixedly connected to the non-rotating member of the rotating base, and the drill bit 9 is fixedly connected to the rotating member of the rotating base so that the drill bit 9 can rotate relative to the upper joint 1. A snap-fit ​​groove is formed at the connection between the rotating member and the drill bit 9 located inside the hollow passage 16.

[0027] The joint portion 200 is inserted into the hollow channel 16 of the drill head portion 100 . The outer wall of the joint portion 200 has an elastic protrusion, which is engaged in the engaging groove.

[0028] See attached Figure 2 The rotating seat includes an inner shaft 2, and an upper bearing 6, a suspension joint 3 and a lower bearing 7 which are sequentially sleeved on the outer wall of the inner shaft 2 from top to bottom. The outer wall of the bottom end of the inner shaft 2 is connected with a fastening bolt 4. The fastening bolt 4 tightens the non-rotating ends of the lower bearing 7 and the upper bearing 6 to the bottom end of the upper joint 1. The suspension joint 3 is clamped on the rotating ends of the lower bearing 7 and the upper bearing 6. The bottom end of the suspension joint 3 is fastened with a spring-loaded joint 5 by a thread, and a snap-on groove is formed on the inner side wall where the spring-loaded joint 5 and the drill bit 9 are connected.

[0029] In this embodiment, the suspension joint 3 includes a first annular seat 17 clamped at the rotating ends of the lower bearing 7 and the upper bearing 6, and the first annular seat 17 has a second annular seat 18 extending downward; the upper bearing 6 is located between the first annular seat 17 and the bottom edge of the upper joint 1, and the lower bearing 7 is located between the second annular seat 18 and the outer wall of the inner shaft 2.

[0030] Furthermore, the outer wall of the second annular seat 18 has an external thread and is fastened to the top thread of the spring-lock joint 5. The lower part of the inner wall of the second annular seat 18 has an internal thread. The fastening bolt 4 is sleeved on the outer wall of the inner shaft 2 and is fastened to the internal thread of the second annular seat 18.

[0031] See attached Figure 4 and attached Figure 5 An annular groove 19 is provided on the inner wall of the top end of the drill bit 9, and a plurality of axially extending stoppers 8 are provided on the inner bottom edge of the spring-loaded joint 5. The plurality of stoppers 8 are inserted into the annular groove 19 so that a snap-fit ​​groove is formed between adjacent stoppers 8 and the annular groove 19.

[0032] See attached Figure 3 The joint part 200 includes a support sleeve 21, a cotter pin 12, a spring clip 13 and a tension spring 14; the support sleeve 21 is sleeved in the hollow channel 16 at intervals, and the side wall has a spring clip hole 20; the two ends of the cotter pin 12 are radially fixed on the inner side wall of the support sleeve 21, and the number of the spring clips 13 is two, one end of the two spring clips 13 is sleeved on the outside of the cotter pin 12, and the other end corresponds to the spring clip hole 20; the tension spring 14 is fixed between the two spring clips 13, so that the two spring clips 13 extend out of the spring clip hole 20 and are engaged with the connecting groove.

[0033] In this embodiment, the support sleeve 21 includes an inner tube 11 and an outer tube 15 that are coaxially sleeved. The inner tube 11 and the outer tube 15 are fixedly connected by a cotter pin 12 , and spring-locking holes 20 are provided on the inner tube 11 and the outer tube 15 .

[0034] Furthermore, a conversion joint 10 is fixedly connected to the top ends of the inner tube 11 and the outer tube 15 .

[0035] Furthermore, the top end of the upper joint 1 is connected to the drill pipe column.

[0036] In this embodiment, there are two stoppers 8 .

[0037] This embodiment discloses an internal drive coring drill bit for deep sea drilling. The specific operation procedure is as follows:

[0038] S1, assembling the drill head 100;

[0039] S2. Connect the assembled drill head 100 to the lower end of the drill string

[0040] S3, drilling down to the predetermined layer;

[0041] S4: Put in the coring tool and start the coring operation. After the coring operation is completed, salvage the coring tool;

[0042] S5. The downhole power tool is put into operation. Under the action of the drilling head 200, the downhole power tool drives the drill bit 9 of the drilling head 100 to rotate and drill, and starts to sweep the hole;

[0043] S6. After the hole is swept, continue the coring operation.

[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0045] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An internal drive coring drill bit for deep sea drilling, characterized in that: include: A drill portion (100) and a joint portion (200); An axial hollow channel (16) is formed inside the drill head (100), and the drill head (100) comprises an upper joint (1), a rotating seat, and a drill bit (9) connected in sequence from top to bottom, the upper joint (1) being fixedly connected to a non-rotating member of the rotating seat, and the drill bit (9) being fixedly connected to a rotating member of the rotating seat, so that the drill bit (9) can rotate relative to the upper joint (1), and a clamping groove is provided at a connection point between the rotating member and the drill bit (9) located inside the hollow channel (16); The joint portion (200) is inserted into the hollow channel (16) of the drill portion (100), and the outer side wall of the joint portion (200) has an elastic protrusion, which is clamped in the clamping groove; The rotating seat comprises an inner shaft (2), and an upper bearing (6), a suspension joint (3) and a lower bearing (7) which are sequentially sleeved on the outer side wall of the inner shaft (2) from top to bottom. The outer side wall of the bottom end of the inner shaft (2) is connected with a fastening bolt (4). The fastening bolt (4) presses the non-rotating ends of the lower bearing (7) and the upper bearing (6) against the bottom end of the upper joint (1). The suspension joint (3) is clamped on the rotating ends of the lower bearing (7) and the upper bearing (6). The bottom end of the suspension joint (3) is fastened with a spring-loaded joint (5) by a thread. The snap-fitting groove is formed on the inner side wall where the spring-loaded joint (5) and the drill bit (9) are connected.

2. The internal drive core drill bit for deep sea drilling according to claim 1, characterized in that: The suspension joint (3) comprises a first annular seat (17) clamped between the rotating ends of the lower bearing (7) and the upper bearing (6), and a second annular seat (18) extending downward from the first annular seat (17); the upper bearing (6) is located between the first annular seat (17) and the bottom edge of the upper joint (1), and the lower bearing (7) is located between the second annular seat (18) and the outer side wall of the inner shaft (2).

3. The internal drive core drill bit for deep sea drilling according to claim 1, characterized in that: An annular groove (19) is provided on the inner wall of the top end of the drill bit (9), and a plurality of axially extending stoppers (8) are provided on the inner bottom edge of the elastic clamping joint (5). The plurality of stoppers (8) are inserted into the annular groove (19), so that the adjacent stoppers (8) and the annular groove (19) form the clamping groove.

4. The internal drive core drill bit for deep sea drilling according to claim 3, characterized in that: The number of the stoppers (8) is two.

5. An internal drive coring drill bit for deep sea drilling according to any one of claims 1 to 4, characterized in that: The joint portion (200) includes a support sleeve (21), a cotter pin (12), a spring clip (13) and a tension spring (14); the support sleeve (21) is sleeved in the hollow channel (16) at intervals, and the side wall has a spring clip hole (20); both ends of the cotter pin (12) are radially fixed on the inner side wall of the support sleeve (21), the number of the spring clips (13) is two, one end of each of the two spring clips (13) is sleeved on the outside of the cotter pin (12), and the other end corresponds to the spring clip hole (20); the tension spring (14) is fixed between the two spring clips (13), so that the two spring clips (13) extend out of the spring clip hole (20) and are engaged with the engaging groove.

6. The internal drive core drill bit for deep sea drilling according to claim 5, characterized in that: The supporting sleeve (21) comprises an inner tube (11) and an outer tube (15) which are coaxially sleeved, the inner tube (11) and the outer tube (15) being fixedly connected via the cotter pin (12), and the spring-locking hole (20) being provided on the inner tube (11) and the outer tube (15).

7. The internal drive coring drill bit for deep sea drilling according to claim 5, characterized in that: A conversion joint (10) is fixedly connected to the top ends of the inner tube (11) and the outer tube (15).

8. The internal drive core drill bit for deep sea drilling according to claim 1, characterized in that: The top end of the upper joint (1) is connected to the drill pipe column.

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