PDC (Polycrystalline Diamond Compact) drill bit with replaceable blades

Abstract

The utility model relates to a PDC (Polycrystalline Diamond Compact) drill bit with replaceable blades, which belongs to the technical field of PDC drill bits and comprises a drill bit and a connecting seat, the outer surface of the drill bit is provided with a mounting groove, the inner surface of the mounting groove is provided with a limiting groove, the blades are attached in the mounting groove, and two sides of each blade are fixedly connected with limiting strips. Through cooperative use of the mounting groove, the connecting column, the locking groove, the locking groove and the penetrating groove, when the blade needs to be replaced, the connecting seat is rotated anticlockwise to pull the locking rod out of the locking groove, at the moment, the blade can be taken out of the mounting groove, and when the blade is mounted again, the blade is mounted in the mounting groove, so that the blade can be replaced conveniently. The connecting column penetrates through the through hole and extends into the locking groove, at the moment, the connecting seat is rotated clockwise to enable the locking rod to enter and extend out of the through groove, the inner wall of the locking groove is attached to the side wall of the connecting column, replacement of the blade is completed, operation is easy, convenient and rapid, bolts are not needed, and the situation that the bolts are seriously abraded and cannot be disassembled is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of PDC drill bit technology, specifically relating to a PDC drill bit with replaceable cutter wings. Background Technology

[0002] PDC drill bits, short for polycrystalline diamond composite drill bits, are high-efficiency and durable drilling tools primarily used in oil and gas exploration. The working principle of PDC drill bits is to use cutting teeth to generate shear stress in the formation, causing plastic deformation and fracture of the rock, and removing rock cuttings. Compared to traditional drill bits, PDC drill bits have higher penetration speeds, longer service life, and lower maintenance costs. Furthermore, PDC drill bits have better self-cleaning properties, reducing stuck pipe during drilling and lowering operational risks.

[0003] A search revealed Chinese utility model patent CN221032437U, which discloses a PDC drill bit with easy tooth replacement. The drill bit includes: a drill body; multiple cutter blade bodies detachably mounted on the outer side of the drill body; multiple sliding covers detachably mounted on each cutter blade body; and cutting teeth fixed on each sliding cover. Cutting grooves are formed on the outer side of each cutter blade body at positions corresponding to each sliding cover. A cutting guide is fixed to the side of each sliding cover near the cutter blade body, and the cutting guide is inserted into the cutting groove. Cutting screw holes are formed on the side of each cutter blade body at positions corresponding to the cutting grooves. A cutting bolt is threaded to the end of each sliding cover away from the cutting teeth, and the cutting bolt is threaded into the cutting screw hole. This utility model provides a PDC drill bit with easy tooth replacement. This device design allows for individual replacement of the cutting teeth, solving the problem of the entire drill bit being rendered unusable when the connecting mechanism malfunctions. It is more convenient to use and saves costs.

[0004] Although the aforementioned utility model patent can replace the cutter blades of the drill bit, it requires the use of a large number of bolts. Since the drill bit works in the working environment of oil and gas exploration, the long-term wear of the bolts will cause the end face of the bolt to lose its original shape, making disassembly difficult. Based on this, a PDC drill bit with replaceable cutter blades is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a PDC drill bit with replaceable cutter blades that has a simple structure and reasonable design in order to solve the above problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A replaceable blade PDC drill bit includes a drill bit and a connecting seat. The outer surface of the drill bit has a mounting groove, and the inner surface of the mounting groove has a limiting groove. A blade is fitted inside the mounting groove. Limiting strips are fixedly connected to both sides of the blade, and the limiting strips are slidably connected to the limiting groove. The cutting part of the blade is threaded with cutting teeth. A clamping part is fixedly connected to the bottom of the blade. A locking part is provided on the top of the connecting seat. The drill bit and the connecting seat are connected through the clamping part and the locking part.

[0008] As a further optimization of this utility model, both the limiting strip and the limiting groove are set to "T" shape, which are compatible with each other and fit tightly together.

[0009] As a further optimization of this utility model, the clamping part includes a connecting post fixedly connected to the bottom of the blade wing, and the connecting post has a through groove.

[0010] As a further optimization of this utility model, the bottom of the drill bit is provided with a through hole, the through hole is connected to the inside of the mounting groove, and the connecting post passes through the through hole and fits against the inner surface of the through hole.

[0011] As a further optimization of this utility model, the locking part includes a locking groove formed on the top of the connecting seat, and a locking rod is fixedly connected in the locking groove.

[0012] As a further optimization of this utility model, the connecting post is adapted to the locking groove, the locking rod is adapted to the through groove, and the length of the locking rod is greater than that of the through groove. A baffle is inserted into the bottom of the connecting seat, and the baffle extends into the locking groove and fits against the end of the locking rod.

[0013] The beneficial effects of this utility model are as follows: By using the installation groove, connecting column, locking groove, and through groove in combination, when it is necessary to replace the cutter wing, first remove the connecting seat from the drill rod, then pull out the baffle and rotate the connecting seat counterclockwise to pull the locking rod out of the locking groove. At this time, the cutter wing can be taken out from the installation groove. When reinstalling, install the cutter wing in the installation groove, so that the connecting column passes through the through hole and extends into the locking groove. Then, rotate the connecting seat clockwise to let the locking rod enter and extend into the through groove, and make the inner wall of the locking groove fit with the side wall of the connecting column, thus completing the replacement of the cutter wing. The operation is simple and quick, without the need for bolts, and there is no situation where the bolts are severely worn and cannot be disassembled. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the frontal cross-section of this utility model;

[0016] Figure 3 This is a cross-sectional structural diagram of the connection between the drill bit and the connecting seat of this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the top of the drill bit of this utility model;

[0018] Figure 5 This is the utility model Figure 4 Enlarged structural diagram at point A in the middle;

[0019] Figure 6 This is a three-dimensional partial cross-sectional structural diagram of this utility model;

[0020] Figure 7 This is a three-dimensional partial cross-sectional view of the structure of this utility model from below.

[0021] In the diagram: 1. Drill bit; 2. Connecting seat; 3. Cutting blade; 4. Limiting strip; 5. Limiting groove; 6. Cutting teeth; 7. Mounting groove; 8. Connecting post; 9. Locking groove; 10. Locking rod; 11. Through groove; 12. Baffle. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a PDC drill bit with replaceable blades includes a drill bit 1 and a connecting seat 2. The inner surface of the connecting seat 2 is fitted to the bottom outer surface of the drill bit 1. A threaded post is provided at the bottom of the connecting seat 2 for connection with the drill rod. An installation groove 7 is provided on the outer surface of the drill bit 1, and a through hole is provided at the bottom of the drill bit 1, communicating with the interior of the installation groove 7. A limit groove 5 is provided on the inner surface of the installation groove 7. A blade 3 is fitted inside the installation groove 7. Limiting strips 4 are fixedly connected to both sides of the blade 3. The limiting strips 4 are slidably connected to the limiting grooves 5. Both the limiting strips 4 and the limiting grooves 5 are set in a "T" shape, and they are mutually compatible and tightly fitted. The cutting part of the blade 3 is connected to cutting teeth 6 by threads. The cutting teeth 6 are set in a hexagonal prism shape, and when the drill bit 1 rotates, the cutting... The cutting part of the cutting tooth 6 is a plane or straight line to reduce the wear of the corner of the cutting tooth 6. The bottom of the blade 3 is fixedly connected to a clamping part, which includes a connecting post 8 fixedly connected to the bottom of the blade 3. The connecting post 8 has a through groove 11. The connecting post 8 passes through the through hole and fits against the inner surface of the through hole. The top of the connecting seat 2 is provided with a locking part. The drill bit 1 and the connecting seat 2 are connected by the clamping part and the locking part. The locking part includes a locking groove 9 opened on the top of the connecting seat 2. The connecting post 8 is adapted to the locking groove 9. A locking rod 10 is fixedly connected in the locking groove 9. The locking rod 10 is adapted to the through groove 11, and the length of the locking rod 10 is greater than that of the through groove 11. A baffle 12 is inserted into the bottom of the connecting seat 2. The baffle 12 extends into the locking groove 9 and fits against the end of the locking rod 10.

[0024] When the cutting tooth 6 is damaged and needs to be replaced, simply rotate the cutting tooth 6 to remove it for replacement. When the cutter wing 3 needs to be replaced, first remove the connecting seat 2 from the drill rod, then pull out the baffle 12 and rotate the connecting seat 2 counterclockwise to pull the locking rod 10 out of the through groove 11. Then the cutter wing 3 can be removed from the mounting groove 7, thereby pulling the connecting post 8 out of the locking groove 9. When reinstalling, install the cutter wing 3 in the mounting groove 7, aligning the limiting strip 4 with the limiting groove 5. When the cutter wing 3 is installed in the mounting groove 7, the connecting post 8 will penetrate. The locking rod 10 extends through the through hole and into the locking groove 9. Then, the connecting seat 2 can be rotated clockwise so that the locking rod 10 enters and extends through the through groove 11, and the inner wall of the locking groove 9 fits against the side wall of the connecting column 8. Then, the baffle 12 is inserted into the connecting seat 2 so that the baffle 12 fits against the end of the locking rod 10, thus completing the replacement of the cutter wing 3. The operation is simple and quick, without the need for bolts, and there is no situation where the bolts are worn so badly that they cannot be disassembled. When the connecting seat 2 is reinstalled on the drill rod, the end of the drill rod will press against the baffle 12, so that the baffle 12 will not detach from the connecting seat 2.

[0025] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A PDC drill bit with replaceable cutter blades, comprising a drill bit (1) and a connecting seat (2), characterized in that: The outer surface of the drill bit (1) is provided with an installation groove (7), and the inner surface of the installation groove (7) is provided with a limiting groove (5). A blade (3) is fitted inside the installation groove (7). Limiting strips (4) are fixedly connected to both sides of the blade (3). The limiting strips (4) are slidably connected to the limiting groove (5). The cutting part of the blade (3) is connected with cutting teeth (6) by thread. A clamping part is fixedly connected to the bottom of the blade (3). A locking part is provided on the top of the connecting seat (2). The drill bit (1) and the connecting seat (2) are connected by the clamping part and the locking part.

2. The PDC drill bit with replaceable cutter wings according to claim 1, characterized in that: The limiting strip (4) and the limiting groove (5) are both set to "T" shape, and the two are compatible with each other, and the limiting strip (4) and the limiting groove (5) fit tightly together.

3. The PDC drill bit with replaceable cutter wings according to claim 1, characterized in that: The clamping part includes a connecting post (8) fixedly connected to the bottom of the blade (3), and the connecting post (8) is provided with a through groove (11).

4. A PDC drill bit with replaceable cutter wings according to claim 3, characterized in that: The bottom of the drill bit (1) has a through hole, which is connected to the inside of the mounting groove (7). The connecting post (8) passes through the through hole and fits against the inner surface of the through hole.

5. A PDC drill bit with replaceable cutter wings according to claim 3, characterized in that: The locking part includes a locking groove (9) opened on the top of the connecting seat (2), and a locking rod (10) is fixedly connected in the locking groove (9).

6. A PDC drill bit with replaceable cutter wings according to claim 5, characterized in that: The connecting post (8) is adapted to the locking groove (9), the locking rod (10) is adapted to the through groove (11), and the length of the locking rod (10) is greater than that of the through groove (11). A baffle (12) is inserted into the bottom of the connecting seat (2), and the baffle (12) extends into the locking groove (9) and fits against the end of the locking rod (10).

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