Impact-resistant and corrosion-resistant oil field well drilling bit

Abstract

The utility model provides an anti-impact and anti-corrosion oil field well drilling bit which comprises a bit body, a rectangular mounting hole is formed in the surface of the top of the bit body, a cutting blade is mounted in the rectangular mounting hole, cutting teeth are mounted on the peripheral side face of the cutting blade, counter bores are formed in the peripheral side face of the bit body, and the counter bores are arranged in the rectangular mounting hole. First fixing holes are formed in the surfaces of the cutting blades, and the cutting blades penetrate through the counter bores and the first fixing holes through first fasteners to be fixedly connected with the drill bit body. Due to the modular design, the limitation of a traditional integrated drill bit is broken through. In actual oil field drilling operation, when the cutting blade is abraded, cracked and the like due to long-time friction and impact with a high-hardness rock stratum, a worker does not need to replace the whole expensive and complex drill bit body, and can quickly take down the damaged cutting blade and replace the damaged cutting blade with a new component only by using a tool to disassemble the first fastener, so that the working efficiency is improved. And the maintenance cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to an impact-resistant and corrosion-resistant oilfield drilling bit. Background Technology

[0002] Drill bits are common rock-breaking tools used in drilling engineering to break rocks and form wellbores, such as in geological research and oil extraction. One of the commonly used drill bits in modern drilling engineering is the PDC (polycrystalline diamond composite) drill bit. When used in oilfield drilling, because the geological layer where crude oil is located is a long distance from the surface, the drilling depth is long, the time required is long, and the rock layer is hard, the drill bit is very prone to damage or wear after prolonged use.

[0003] Extensive research revealed that existing technologies, such as the technical problems in the PDC drill bit for oilfield drilling application number CN202122018625.9, show that most existing PDC drill bits are of a single-piece structure, with the front end being a vulnerable part. When damaged, the entire part needs to be replaced. However, the PDC drill bit itself has high hardness and a curved surface structure, making it difficult and costly to process.

[0004] Therefore, it is necessary to provide an impact-resistant and corrosion-resistant oilfield drilling bit to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides an impact-resistant and corrosion-resistant oilfield drilling bit, which solves the problems in the background art.

[0006] To address the aforementioned technical problems, this utility model provides an impact-resistant and corrosion-resistant oilfield drilling bit, comprising a drill bit body. A rectangular mounting hole is formed on the top surface of the drill bit body, and a cutting blade is installed inside the rectangular mounting hole. Cutting teeth are installed on the peripheral side of the cutting blade. A countersunk hole is formed on the peripheral side of the drill bit body, and a first fixing hole is formed on the surface of the cutting blade. The cutting blade is fixedly connected to the drill bit body via a first fastener passing through the countersunk hole and the first fixing hole. This modular design breaks the limitations of traditional integrated drill bits. In actual oilfield drilling operations, when the cutting blade suffers wear, cracking, or other damage due to prolonged friction and impact with high-hardness rock formations, operators do not need to replace the entire expensive and complex drill bit body. They only need to use tools to remove the first fastener to quickly remove the damaged cutting blade and replace it with a new part, greatly reducing maintenance costs. Meanwhile, since no complete replacement is required, downtime for changing drill bits is significantly reduced, improving the continuity and efficiency of drilling operations. Furthermore, this structure allows for separate optimization of the cutting blades and drill bit body during design and manufacturing, such as by using different materials and processing techniques, thereby enhancing the overall performance and adaptability of the drill bit.

[0007] Preferably, the outer surface of the cutting blade has a mounting groove, and the cutting teeth are installed inside the mounting groove. A second fixing hole is formed on the surface of the cutting blade, and the cutting teeth are fixedly connected to the cutting blade via a second fastener. This design allows for independent installation and replacement of the cutting teeth. During drilling, the cutting teeth, as key components in direct contact with the rock, are highly susceptible to failure due to wear and impact. With this structure, when a cutting tooth is damaged, it is not necessary to replace the entire cutting blade; simply removing the corresponding second fastener allows for quick replacement of the damaged cutting tooth. This not only reduces maintenance costs but also restores the cutting performance of the cutting blade in a timely manner. Moreover, since the cutting teeth can be replaced individually, different materials, shapes, and sizes of cutting teeth can be flexibly combined according to different geological conditions and drilling requirements to achieve efficient rock fragmentation. Meanwhile, the fit between the mounting slot and the second fastener enhances the connection strength and stability between the cutting teeth and the cutting blade, making the cutting teeth less prone to loosening or falling off under high load conditions, effectively improving the reliability and durability of the drill bit.

[0008] Preferably, multiple cutting blades are installed, and these blades are equidistantly arranged around the top surface of the drill bit body. This arrangement allows each cutting blade to apply force evenly to the rock formation during drill bit rotation. During drilling, the reaction force on the drill bit is also more balanced, effectively reducing vibration and deflection caused by uneven force distribution, thus improving drilling accuracy and stability. Simultaneously, the coordinated operation of multiple cutting blades increases the contact area with the rock formation per unit time, improving rock breaking efficiency and accelerating drilling speed. Furthermore, the evenly distributed cutting blades ensure more uniform wear of the drill bit, preventing excessive localized wear and extending the overall service life of the drill bit.

[0009] Preferably, multiple cutting teeth are provided, and these teeth are equidistantly mounted on the outer surface of the cutting blade. This equidistant mounting further optimizes the cutting performance of the cutting blade. The equidistantly distributed cutting teeth create a continuous and uniform cutting trajectory during the cutting process, resulting in more uniform stress on the rock formation and better fragmentation. Each cutting tooth bears a relatively balanced load during operation, reducing the risk of damage to individual teeth due to excessive stress and improving their service life and reliability. Furthermore, this layout facilitates the flow of drilling fluid between the cutting teeth, more effectively carrying away rock cuttings, keeping the cutting surface clean, improving cutting efficiency, and also helping to reduce cutting temperature, thus minimizing wear and damage to the cutting teeth caused by high temperatures.

[0010] Preferably, the cutting blade and the rectangular mounting hole are fitted with a zero clearance, ensuring precise installation and secure connection of the cutting blade on the drill bit body. This zero-clearance fit minimizes blade wobble and displacement during operation, allowing cutting force to be efficiently and stably transmitted from the drill bit body to the cutting blade and cutting teeth, improving energy transfer efficiency and cutting performance. Simultaneously, this tight fit enhances the drill bit's overall rigidity and impact resistance, effectively preventing damage to the cutting blade due to loosening when facing complex geological conditions and high-hardness rock formations, ensuring the drill bit's reliability and stability, and extending its service life.

[0011] Preferably, the bottom end of the drill bit body is provided with a connecting seat, and the drill bit body is connected to the drive device through the connecting seat. The connection between the bottom end of the drill bit body and the drive device provides a stable and reliable power transmission interface for the drill bit.

[0012] Compared with related technologies, the impact-resistant and corrosion-resistant oilfield drilling bit provided by this utility model has the following beneficial effects:

[0013] Compared to existing technologies, this drill bit features a rectangular mounting hole on its top surface. The cutting blades are fixedly connected to the drill bit body via a first fastener passing through the countersunk hole and the first fixing hole. This design eliminates the need to replace the entire drill bit body when the cutting blades are damaged or worn; only the first fastener needs to be removed, the damaged cutting blade removed, and a new one replaced. Compared to traditional integrated PDC drill bits, this design avoids the complete scrapping of the drill bit due to damage to the vulnerable front-end components, significantly reducing maintenance costs and resource waste. It also reduces the time spent replacing the drill bit, improving drilling efficiency.

[0014] Compared to existing technologies, this design features mounting grooves on the outer surface of the cutting blade, with the cutting teeth fixedly connected to the blade via a second fastener. This structural design facilitates the individual installation and replacement of the cutting teeth. When a cutting tooth becomes worn or damaged, it can be replaced promptly, ensuring the overall cutting performance of the cutting blade. Furthermore, by rationally selecting the material and shape of the cutting teeth and precisely installing them within the mounting grooves, the connection stability between the cutting teeth and the cutting blade is enhanced. This effectively improves the drill bit's impact resistance and corrosion resistance when facing high-hardness rock formations, extending the drill bit's service life.

[0015] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of an impact-resistant and corrosion-resistant oilfield drilling bit provided by this utility model;

[0017] Figure 2 A schematic diagram of a rectangular mounting hole structure for an impact-resistant and corrosion-resistant oilfield drilling bit provided by this utility model;

[0018] Figure 3 A schematic diagram of the cutting blade structure of an impact-resistant and corrosion-resistant oilfield drilling bit provided by this utility model;

[0019] Figure 4 This utility model provides a schematic diagram of the second fixing hole structure of an impact-resistant and corrosion-resistant oilfield drilling bit.

[0020] Numbering on the map:

[0021] 1. Drill bit body; 2. Cutting blade; 3. First fastener; 4. Connecting seat; 5. Rectangular mounting hole; 6. Countersunk hole; 7. Cutting teeth; 8. Mounting groove; 9. First fixing hole; 10. Second fixing hole; 11. Second fastener. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] First Embodiment

[0024] Please refer to the following: Figure 1-4 A shock-resistant and corrosion-resistant oilfield drilling bit includes a drill bit body 1. A rectangular mounting hole 5 is formed on the top surface of the drill bit body 1. A cutting blade 2 is installed inside the rectangular mounting hole 5. Cutting teeth 7 are installed on the peripheral side of the cutting blade 2. A countersunk hole 6 is formed on the peripheral side of the drill bit body 1. A first fixing hole 9 is formed on the surface of the cutting blade 2. The cutting blade 2 is fixedly connected to the drill bit body 1 through the countersunk hole 6 and the first fixing hole 9 by a first fastener 3. The rectangular mounting hole 5 is formed on the top of the drill bit body 1, and the cutting blade 2 is fixedly connected to the drill bit body 1 through the countersunk hole 6 and the first fixing hole 9 by the first fastener 3. This modular design breaks the limitations of traditional one-piece drill bits. In actual oilfield drilling operations, when the cutting blade 2 suffers wear, cracking, or other damage due to prolonged friction and impact with high-hardness rock formations, operators do not need to replace the entire expensive and complex drill bit body 1. They can quickly remove the damaged cutting blade 2 and replace it with a new part simply by using tools to disassemble the first fastener 3, significantly reducing maintenance costs. Simultaneously, since no complete replacement is required, downtime for drill bit replacement is greatly reduced, improving the continuity and efficiency of drilling operations. Furthermore, this structure allows for separate optimization of the cutting blade 2 and drill bit body 1 during drill bit design and manufacturing, such as using different materials and processing techniques, thereby improving the overall performance and adaptability of the drill bit.

[0025] The working principle of the impact-resistant and corrosion-resistant oilfield drilling bit provided by this utility model is as follows:

[0026] In oilfield drilling operations, the connecting seat 4 at the bottom of the drill bit body 1 is connected to the drive equipment (such as the drill pipe of the drilling rig), which provides rotational power and axial pressure to the drill bit. When the drill bit starts working, the drill bit body 1 rotates at high speed under the drive of the drive equipment. At this time, multiple cutting blades 2 installed in the rectangular mounting holes 5 on the top surface of the drill bit body 1 will rotate together with the drill bit body 1.

[0027] The multiple cutting teeth 7 mounted on the sides of the cutting blades 2 are the components that directly contact the rock and perform the crushing work. During rotation, the cutting teeth 7, with their sharp edges and high hardness, cut and compress the rock strata. Because the multiple cutting blades 2 are evenly spaced around the top surface of the drill bit body 1, and the multiple cutting teeth 7 on each cutting blade 2 are evenly distributed, they can apply force evenly to the rock strata during rotation, making the rock strata more uniformly stressed and easier to crush.

[0028] During the cutting process, significant friction and impact forces are generated between the cutting teeth 7 and the rock strata. Thanks to the structural design where the cutting teeth 7 are fixedly connected to the cutting blade 2 via the second fastener 11, and the cutting blade 2 is fixedly connected to the drill bit body 1 via the first fastener 3, the connections between the components remain stable even under strong external forces, effectively preventing the cutting teeth 7 or the cutting blade 2 from falling off. Simultaneously, the cutting blade 2 and the rectangular mounting hole 5 employ a clearance fit with a zero clearance value, further enhancing the stability of the cutting blade 2 installation. This allows the cutting force to be better transmitted from the drill bit body 1 to the cutting blade 2 and the cutting teeth 7, ensuring the smooth operation of the rock breaking work.

[0029] As the drill bit continues to drill downwards, the rock fragments that are cut and broken will be discharged from the wellhead through the chip removal channel on the drill bit body 1 under the flushing and carrying action of the drilling fluid, thereby ensuring that the drill bit continues to effectively break the rock formation and gradually form the required wellbore.

[0030] Compared with related technologies, the impact-resistant and corrosion-resistant oilfield drilling bit provided by this utility model has the following beneficial effects:

[0031] A rectangular mounting hole 5 is formed on the top surface of the drill bit body 1. The cutting blade 2 is fixedly connected to the drill bit body 1 through the countersunk hole 6 and the first fixing hole 9 via the first fastener 3. This design allows the drill bit body 1 to be replaced without replacing the entire drill bit body 1 when the cutting blade 2 is damaged or worn. Only the first fastener 3 needs to be removed, the damaged cutting blade 2 can be removed and replaced with a new one. Compared with traditional integrated PDC drill bits, this avoids the scrapping of the entire drill bit due to the damage of vulnerable front-end parts, significantly reducing maintenance costs and resource waste. It also reduces the time spent replacing the drill bit and improves drilling efficiency. A mounting groove 8 is formed on the outer surface of the cutting blade 2, and the cutting teeth 7 are fixedly connected to the cutting blade 2 via the second fastener 11. This structural design facilitates the individual installation and replacement of the cutting teeth 7. When a cutting tooth 7 is worn or damaged, it can be replaced in time to ensure the overall cutting performance of the cutting blade 2. Moreover, by rationally selecting the material and shape of the cutting teeth 7 and precisely installing them in the mounting groove 8, the connection stability between the cutting teeth 7 and the cutting blade 2 can be enhanced. When facing high-hardness rock formations, this effectively improves the drill bit's impact resistance and corrosion resistance, and extends the drill bit's service life.

[0032] Second Embodiment

[0033] Please refer to the following: Figure 1-4 Based on the first embodiment of this application which provides an impact-resistant and corrosion-resistant oilfield drilling bit, the second embodiment of this application proposes another impact-resistant and corrosion-resistant oilfield drilling bit. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0034] Based on Example 1, see [link / reference] Figure 1-4 The outer surface of the cutting blade 2 has a mounting groove 8, and the cutting tooth 7 is installed inside the mounting groove 8. A second fixing hole 10 is formed on the surface of the cutting blade 2, and the cutting tooth 7 is fixedly connected to the cutting blade 2 by a second fastener 11. This design allows for independent installation and replacement of the cutting tooth 7. During drilling, the cutting tooth 7, as a key component directly in contact with the rock, is highly susceptible to failure due to wear and impact. With this structure, when a cutting tooth 7 is damaged, it is not necessary to replace the entire cutting blade 2; simply removing the corresponding second fastener 11 allows for quick replacement of the damaged cutting tooth 7, reducing maintenance costs and promptly restoring the cutting performance of the cutting blade 2. Furthermore, since the cutting tooth 7 can be replaced individually, different materials, shapes, and sizes of cutting teeth 7 can be flexibly combined according to different geological conditions and drilling requirements to achieve efficient rock fragmentation. Meanwhile, the cooperation between the mounting groove 8 and the second fastener 11 enhances the connection strength and stability between the cutting teeth 7 and the cutting blade 2, making the cutting teeth 7 less prone to loosening or falling off under high load conditions, effectively improving the reliability and durability of the drill bit.

[0035] Based on Example 1, see [link / reference] Figure 1-4 Multiple cutting blades 2 are installed, and these blades 2 are equidistantly arranged around the top surface of the drill bit body 1. This arrangement allows each cutting blade 2 to apply force evenly to the rock formation during drill bit rotation. During drilling, the reaction force on the drill bit is also more balanced, effectively reducing vibration and deflection caused by uneven force, thus improving drilling accuracy and stability. Simultaneously, the coordinated work of multiple cutting blades 2 increases the contact area with the rock formation per unit time, improving rock breaking efficiency and accelerating drilling speed. Furthermore, the evenly distributed cutting blades 2 also ensure more uniform wear of the drill bit, avoiding excessive localized wear and extending the overall service life of the drill bit.

[0036] Based on Example 1, see [link / reference] Figure 1-4Multiple cutting teeth 7 are provided and are equidistantly installed on the outer surface of the cutting blade 2, further optimizing the cutting performance of the cutting blade 2. The equidistantly distributed cutting teeth 7 can form a continuous and uniform cutting trajectory during the cutting process, resulting in more uniform stress on the rock formation and better fragmentation. Each cutting tooth 7 bears a relatively balanced load during operation, reducing the risk of damage to a single cutting tooth 7 due to excessive stress, and improving the service life and reliability of the cutting teeth 7. Moreover, this layout facilitates the flow of drilling fluid between the cutting teeth 7, more effectively carrying away rock cuttings, keeping the cutting surface clean, improving cutting efficiency, and also helping to reduce cutting temperature, minimizing wear and damage to the cutting teeth 7 caused by high temperatures.

[0037] Based on Example 1, see [link / reference] Figure 1-4 The cutting blade 2 is fitted with the rectangular mounting hole 5 with a clearance of zero, ensuring precise installation and secure connection of the cutting blade 2 on the drill bit body 1. This zero-clearance fit minimizes the wobbling and displacement of the cutting blade 2 during operation, allowing cutting force to be efficiently and stably transmitted from the drill bit body 1 to the cutting blade 2 and cutting teeth 7, improving the drill bit's energy transfer efficiency and cutting performance. Simultaneously, this tight fit enhances the drill bit's overall rigidity and impact resistance, effectively preventing damage to the cutting blade 2 due to loosening when facing complex geological conditions and high-hardness rock formations, ensuring the reliability and stability of the drill bit's operation, and extending its service life.

[0038] Based on Example 1, see [link / reference] Figure 1-4 The drill bit body 1 is provided with a connecting seat 4 at its bottom end. The drill bit body 1 is connected to the drive device through the connecting seat 4. The connection of the connecting seat 4 at the bottom end of the drill bit body 1 to the drive device provides a stable and reliable power transmission interface for the drill bit.

[0039] It should be noted that all components used in this application are standard parts that can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets and welding that are mature in the prior art. The mechanical parts and electrical equipment adopt conventional models in the prior art. The circuit connection adopts conventional connection methods in the prior art. The electrical equipment is connected to an external safe power source. These will not be described in detail here.

[0040] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An impact-resistant and corrosion-resistant oilfield drilling bit, comprising a bit body (1), characterized in that, The top surface of the drill bit body (1) is provided with a rectangular mounting hole (5), a cutting blade (2) is installed inside the rectangular mounting hole (5), cutting teeth (7) are installed on the peripheral side of the cutting blade (2), a countersunk hole (6) is provided on the peripheral side of the drill bit body (1), a first fixing hole (9) is provided on the surface of the cutting blade (2), and the cutting blade (2) is fixedly connected to the drill bit body (1) through the countersunk hole (6) and the first fixing hole (9) by a first fastener (3).

2. The impact-resistant and corrosion-resistant oilfield drilling bit according to claim 1, characterized in that, The outer surface of the cutting blade (2) is provided with a mounting groove (8), the cutting tooth (7) is installed inside the mounting groove (8), the surface of the cutting blade (2) is provided with a second fixing hole (10), and the cutting tooth (7) is fixedly connected to the cutting blade (2) by a second fastener (11).

3. The impact-resistant and corrosion-resistant oilfield drilling bit according to claim 1, characterized in that, The cutting blades (2) are installed in multiple ways, and the multiple cutting blades (2) are installed around the top surface of the drill body (1) at equal distances.

4. The impact-resistant and corrosion-resistant oilfield drilling bit according to claim 1, characterized in that, The cutting teeth (7) are provided in multiple ways, and the multiple cutting teeth (7) are installed at equal intervals on the outer surface of the cutting blade (2).

5. The impact-resistant and corrosion-resistant oilfield drilling bit according to claim 1, characterized in that, The cutting blade (2) is clearance-fitted with the rectangular mounting hole (5), and the clearance value is zero.

6. The impact-resistant and corrosion-resistant oilfield drilling bit according to claim 1, characterized in that, The drill bit body (1) is provided with a connecting seat (4) at its bottom end, and the drill bit body (1) is connected to the drive device through the connecting seat (4).

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