A long-life hybrid drill bit
By setting up a support structure and a wrap structure in the hybrid drill bit, the outer row, the back cone and palm tip of the tooth wheel are protected, which solves the problem of early failure of the tooth wheel due to wear of the well wall during drilling, and extends the use of the drill bit life.
Patent Information
- Application Number
- CN202110665771.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-06-16
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2041-06-16
AI Technical Summary
During drilling, the gear needs to rub against the well wall, causing the well wall to naturally shrink and wear the outer space, back cone and palm tip of the gear, resulting in early failure of the seal and loosening of the gear.
Design a long-life hybrid drill bit, including the drill bit body, palm, tooth wheel, support structure and wrap structure. The support structure and wrap structure are arranged on the side of the gear to protect the outer teeth of the gear. The back cone and palm tip reduce wear of the well wall.
Effectively avoid direct wear of the outer space, back cone and palm tip of the gear on the well wall or bottom, extend the life of the gear sealing area and improve the overall life of the drill bit.
Smart Images
Figure CN113389496B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil drilling tools, in particular to a long-life hybrid drill bit. Background Art
[0002] At present, the commonly used PDC (polycrystalline diamond compact) drill bits mainly achieve downhole drilling through scraping motion. When drilling encounters hard interlayers or hard formations, the main cutting elements on the nose and shoulder of the diamond drill bit are difficult to effectively eat into the bottom hole rock, and the mechanical drilling speed of the diamond drill bit will become very slow. Moreover, when the drill bit encounters a formation with many soft and hard interlayers, the cutting elements of the PDC drill bit are easily damaged by impact. The roller drill bit crushes the rock by impact crushing, which can easily cause deeper crushing tooth pits in the rock. However, due to the hard formation or the interlacing of soft and hard formations, the rock cannot be effectively crushed by volume, and the mechanical drilling speed of the roller drill bit will also be very slow.
[0003] In the related technology, there is a hybrid drill bit composed of a roller drill bit and a PDC diamond drill bit. The hybrid drill bit has strong comprehensive performance. During the drilling process, the roller drill bit pre-crushes the formation to release the formation stress, and then the fixed blade cutting teeth scrape the formation, which effectively improves the mechanical drilling speed of the drill bit. At the same time, the fixed blade cutting teeth are also effectively protected.
[0004] However, in hard formations, the formations are often highly abrasive, and the blades of the hybrid drill bit often deviate from the cone at a certain angle, causing the cone to rub against the well wall to a certain extent. The natural contraction of the well wall can easily directly wear the outer row, back cone and palm tip of the cone, ultimately leading to premature failure of the cone seal and cone loosening.
[0005] Therefore, it is necessary to design a new long-life hybrid drill bit to overcome the above problems. Summary of the invention
[0006] An embodiment of the present invention provides a long-life hybrid drill bit to solve the problem in the related art that during drilling, the cone needs to rub the well wall to a certain extent, and the natural contraction of the well wall is likely to directly wear the outer row, back cone and palm tip of the cone, ultimately leading to premature failure of the cone seal and cone loosening.
[0007] In the first aspect, a long-life hybrid drill bit is provided, which includes: a drill bit body; a tooth palm, one end of which is fixed to the drill bit body and the other end of which is equipped with a gear, and the surface of the gear is fixed with an outer row of teeth; a support structure, which is located on one side of the gear, and the outer side surface of the support structure is provided with a first cutting tooth, and the support structure and the first cutting tooth are used to protect the outer row of teeth of the gear, the back cone and the palm tip of the gear; and a wrapping structure located on the other side of the gear, the wrapping structure is used to protect the outer row of teeth of the gear, the back cone and the palm tip of the gear, and at least one of the wrapping structure or the support structure is arranged on one side of the gear.
[0008] In some embodiments, a first gap is provided between the bit palm and the drill bit body, a second gap is provided between the support structure and the cone, and the second gap is connected to the first gap.
[0009] In some embodiments, along the radial direction of the drill bit body, the thickness of the support structure gradually decreases from the outside to the inside, and the second gap gradually increases from the outside to the inside.
[0010] In some embodiments, when the drill bit body is located in a well, the distance between the first cutting tooth and the well bottom or the well side wall is 0-4 mm.
[0011] In some embodiments, a blade wing is fixedly provided at the end of the drill bit body. The blade wing is spaced apart from the support structure. Along the radial direction of the drill bit body, the gap between the blade wing and the support structure gradually decreases, and a nozzle is arranged between the blade wing and the support structure.
[0012] In some embodiments, a blade wing is fixedly provided at the end of the drill body, and the protective structure is formed by extending from one side of the blade wing toward the direction close to the cone, and the outer surface of the protective structure is coplanar with the outer surface of the blade wing.
[0013] In some embodiments, the wrapping structure has an outer side surface and a bottom surface connected to the outer side surface, and a second cutting tooth is provided at the corner where the outer side surface is connected to the bottom surface. When the drill bit body is located in the well, the distance between the second cutting tooth and the bottom of the well or the side wall of the well is 0 to 4 mm.
[0014] In some embodiments, a third cutting tooth is installed at the bottom of the blade wing, and along the axial direction of the drill bit body, the height of the bottom end of the third cutting tooth is equal to or lower than the height of the bottom end of the second cutting tooth.
[0015] In some embodiments, a third gap is formed between the protection structure and the bottom surface of the drill bit body, and a fourth gap is formed between the protection structure and the cone, and the fourth gap is connected to the third gap.
[0016] In some embodiments, the minimum distance between the wrapping structure and the supporting structure is greater than or equal to the maximum diameter of the gear.
[0017] The beneficial effects brought about by the technical solution provided by the present invention include:
[0018] An embodiment of the present invention provides a long-life hybrid drill bit. Since at least one of the wrapping structure or the supporting structure is arranged on one side of the cone, when the wrapping structure is arranged on one side of the cone, the wrapping structure can protect the outer row of teeth, back cone and palm tip of the cone. When the supporting structure is arranged on one side of the cone, the supporting structure and the first cutting tooth fixed thereto can protect the outer row of teeth, back cone and palm tip of the cone. During the drilling process, the supporting structure or the wrapping structure can support and share the force on the outer row of teeth, back cone and palm tip of the cone, thereby reducing the force on the outer row of teeth, back cone and palm tip. Therefore, it can effectively avoid direct wear of the outer row, back cone and palm tip of the cone by the well wall or bottom, and avoid premature failure of the cone seal. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0020] Figure 1 A schematic diagram of the three-dimensional structure of a long-life hybrid drill bit provided by an embodiment of the present invention when inverted;
[0021] Figure 2 A schematic diagram of the three-dimensional structure of a long-life hybrid drill bit provided by an embodiment of the present invention when it is inverted at another angle;
[0022] Figure 3 A schematic front view of a long-life hybrid drill bit provided by an embodiment of the present invention when inverted.
[0023] In the figure:
[0024] 1. Drill bit body; 2. Palm; 21. Palm tip; 3. Cone; 31. Outer row of teeth; 32. Back cone; 4. Support structure; 41. First cutting tooth; 5. First gap; 6. Second gap; 7. Blade; 71. Third cutting tooth; 8. Nozzle; 9. Wrapping structure; 91. Second cutting tooth; 92. Third gap; 93. Fourth gap; P. Circumferential area. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.
[0026] An embodiment of the present invention provides a long-life hybrid drill bit, which can solve the problem in related technologies that during drilling, the cone needs to rub the well wall to a certain extent, and the natural contraction of the well wall can easily directly wear the outer row, back cone and palm tip of the cone, eventually leading to premature failure of the cone seal and cone loosening.
[0027] See also Figure 1 and Figure 2As shown, a long-life hybrid drill bit provided by an embodiment of the present invention may include: a drill body 1. In this embodiment, the drill body 1 is cylindrical and is provided with an external thread for connecting with a drill rod. During the drilling process, the external thread is located at the upper end of the drill body 1; a tooth palm 2, one end of which may be fixed to the drill body 1. In this embodiment, the upper end of the tooth palm 2 is welded to the drill body 1 as a whole. In other embodiments, the tooth palm 2 may also be fixed to the drill body 1 by other means such as threads. A cone 3 may be installed at the other end of the tooth palm 2. In this embodiment, a journal is provided at the upper end of the tooth palm 2, and the cone 3 can be mounted on the journal and axially locked by a steel ball, so that the cone 3 can freely rotate along the circumferential direction of the journal on the tooth palm 2, and the cone 3 is divided into an inner row, an outer row, a back cone 32, a palm tip 21 and a palm back from the inside to the outside in the radial direction of the drill body 1, wherein the surface of the cone 3 can be fixedly provided with an outer row of teeth 31, that is, the outer row of teeth 31 is installed at the outer row position of the cone 3, and the outer row of teeth 31 is closer to the outer side of the cone 3 relative to the inner row; and a supporting structure 4, It can be located on one side of the cone 3, and the outer side surface of the support structure can be arranged with a first cutting tooth 41. In this embodiment, during the drilling process of the drill bit, the support structure 4 is located on the right side of the cone 3 along the circumferential direction. In other embodiments, the support structure 4 can also be arranged on both the left and right sides of the cone 3 according to actual conditions. Along the axial direction of the drill bit body 1, the free end of the support structure 4 can be roughly the same height as the outer row of teeth 31, that is, the lower end surface of the support structure 4 can be roughly the same height as the lower end of the outer row of teeth 31, and the lower end surface of the support structure 4 can also be Higher than the lower end of the outer row of teeth 31, the support structure 4 can be supported on the bottom of the well together with the cone 3 during the drilling process of the drill bit body 1, and the support structure 4 can share the force of the outer row of teeth 31 of the cone 3, reducing the possibility of broken teeth in the outer row. At the same time, the first cutting tooth 41 can be supported on the side wall of the well, thereby sharing the force of the back cone 32 and the palm tip 21 of the cone, and protecting the back cone 32 and the palm tip 21 of the cone 3. In this embodiment, the gap between the support structure 4 and the bottom of the well or the well wall is preferably 1 to 8 mm, and the cone 3 is preferably provided with 2 to 4 teeth.
[0028] See also Figure 1 and Figure 2As shown, the long-life hybrid drill bit may further include a protective structure 9, which may be arranged on the other side of the cone 3, wherein the protective structure 9 arranged may protect the outer row of teeth 31, the back cone 32 and the palm tip 21 of the cone 3. In this embodiment, at least one of the protective structure 9 or the supporting structure 4 is arranged on one side of the cone, that is, the protective structure 9 may be arranged only on the left side or the right side or both sides of the cone 3, or the supporting structure 4 may be arranged only on the left side or the right side or both sides of the cone 3, or the supporting structure 4 may be arranged on the left side of the cone 3. A supporting structure 4 is arranged, a wrapping structure 9 is arranged on the right side of the cone 3, or a supporting structure 4 is arranged on the right side of the cone 3 and a wrapping structure 9 is arranged on the left side of the cone 3, or a supporting structure 4 and a wrapping structure 9 are arranged on the left side of the cone 3 and a supporting structure 4 and a wrapping structure 9 are arranged on the right side of the cone 3; during the drilling process, the supporting structure 4 or the wrapping structure 9 can support and share the force of the outer row of teeth 31, the back cone 32 and the palm tip 21 of the cone, and effectively avoid direct wear of the outer row of teeth 3, the back cone 32 and the palm tip 21 of the cone 3 by the well wall or the well bottom.
[0029] See also Figure 1 and Figure 2 As shown, in some embodiments, there may be a first gap 5 between the tooth palm 2 and the drill bit body 1, and the first gap 5 reserves a space position between the tooth palm 2 and the drill bit body 1 to facilitate welding and fixing of the tooth palm 2. In this embodiment, the first gap 5 is arranged in an arc shape around the tooth palm 2, and there may be a second gap 6 between the support structure 4 and the cone 3, that is, the cone 3 and the drill bit body 1 are arranged at intervals, wherein the second gap 6 can be connected to the first gap 5, so that the cuttings between the cone 3 and the support structure 4 can flow upward from the second gap 6 to the first gap 5, and then flow from the side of the first gap 5 to the gap between the drill bit body 1 and the well wall, so as to facilitate the discharge of the cuttings.
[0030] See also Figure 1 and Figure 2 As shown, in some optional embodiments, along the radial direction of the drill bit body 1, the thickness of the support structure 4 can gradually decrease from the outside to the inside, that is, the closer to the well wall, the thicker the support structure 4 is, and the closer to the axis of the drill bit body 1, the thinner the support structure 4 is. Since the cone 3 is located near the outside of the drill bit body 1, and the portion of the support structure 4 near the outside is roughly the same as the movement trajectory of the outer row of teeth 31 on the cone 3, the thickness of the portion of the support structure 4 near the outside is designed to be thicker, so that the strength of this portion is better, the force that can be withstood is greater, and the role of protecting the outer row of teeth 31 is better. At the same time, the force on the support structure 4 near the inner side is smaller, and its thickness is designed to be relatively thin, so that the second gap 6 can gradually increase from the outside to the inside, which can ensure that there is a larger chip removal space around the cone 3.
[0031] See also Figure 1 and Figure 3 As shown, in some embodiments, the first cutting tooth 41 is partially located in the support structure 4 and partially exposed from the support structure 4. When the drill bit body 1 is located in the well, the distance between the first cutting tooth 41 and the side wall of the well is 0-4 mm, so that the first cutting tooth 41 located on the side is closer to the inner wall of the well, and then during drilling, the first cutting tooth 41 contacts the well wall before the back cone 32 and the palm tip 21 of the cone 3. In the process of well wall contraction and radial vibration, the first cutting tooth 41 can scrape the well wall, which can reduce the squeezing of the well wall on the back cone 32 and the palm tip 21, and protect the back cone 32 and the palm tip 21 of the cone 3 from being worn, so that the support structure 4 and the first cutting tooth 41 jointly protect the circumferential area P formed by the outer row of teeth 31, the back cone 32 and the palm tip 21 of the cone 3, thereby effectively protecting the sealing position of the cone 3. In this embodiment, the first cutting tooth 41 is preferably 1 mm away from the well wall.
[0032] See also Figure 1 and Figure 2 As shown, in some optional embodiments, a blade wing 7 can also be fixedly provided at the end of the drill bit body 1, and the blade wing 7 is spaced apart from the support structure 4. In this embodiment, at least two blade wings 7 are provided on the end face of the drill bit body 1, and each blade wing 7 is divided into an inner cone, a nose, a shoulder and a gauge section from the inside to the outside along the radial direction of the drill bit body 1. Along the radial direction of the drill bit body 1, the gap between the blade wing 7 and the support structure 4 gradually decreases. In other embodiments, the number of blade wings 7 can be set to 2 to 6. In this embodiment, the support structure 4 is located between the blade wing 7 and the cone 3, and the gap between the portion of the support structure 4 close to the outside and the blade wing 7 is larger, so that the portion of the support structure 4 close to the outside is closer to the cone 3, thereby protecting the cone 3 on one side of the cone 3, and a nozzle 8 can be provided between the blade wing 7 and the support structure 4, and the drilling fluid sprayed by the nozzle 8 facilitates the discharge of rock cuttings between the blade wing 7 and the support structure 4.
[0033] See also Figure 1 and Figure 2 As shown, in some embodiments, a protective structure 9 can be extended from one side of the blade wing 7 toward the direction close to the gear wheel 3. In this embodiment, the protective structure 9 is located on the left side of the gear wheel 3, and the protective structure 9 extends from the shoulder and the gauge section of the blade wing 7 to the right side with a width of preferably 16 mm. In other embodiments, the protective structure 9 can also be provided on both the left and right sides of the blade wing 7. The outer surface of the protective structure 9 is coplanar with the outer surface of the blade wing 7, that is, the bottom height of the protective structure 9 is the same as the bottom height of the blade wing 7, and the outer side surface of the protective structure 9 and the outer side surface of the blade wing 7 are located on the same arc surface. During the drilling process, the side surface of the protective structure 9 can increase the contact area between the drill bit and the well wall, thereby improving the stability of the drill bit.
[0034] See also Figure 1 and Figure 2As shown, in some optional embodiments, a second cutting tooth 91 may be provided at the corner where the outer side surface of the sheathing structure 9 is connected to its bottom surface. The movement trajectory of the second cutting tooth 91 located at the corner is substantially the same as the movement trajectory of the outer row of teeth 31, so that during the drilling process, the second cutting tooth 91 can further share the squeezing of the outer row of teeth 31 by the bottom of the well, and protect the outer row of teeth 31; at the same time, when the drill bit body 1 is located in the well, the distance between the second cutting tooth 91 and the bottom of the well or the side wall of the well can be 0 to 4 mm, so that the second cutting tooth 91 is closer to the inner wall of the well, and then during drilling, the side surface of the second cutting tooth 91 contacts the well wall earlier than the back cone 32 and the palm tip 21 of the gear 3. During the process of well wall contraction and radial vibration, the second cutting tooth 91 can scrape the well wall, reduce the squeezing of the well wall on the back cone 32 and the palm tip 21, and protect the back cone 32 and the palm tip 21 of the gear 3 from wear.
[0035] See also Figure 1 and Figure 2 As shown, in some embodiments, a third cutting tooth 71 may be installed at the bottom of the blade wing 7 for cutting the well wall and the bottom of the well. A plurality of third cutting teeth 71 are sequentially arranged and fixed on the inner cone, the nose, the shoulder and the gauge section, and each blade wing 7 is provided with two rows of third cutting teeth 71. Along the axial direction of the drill bit body 1, the height of the bottom end of the third cutting tooth 71 may be equal to or lower than the height of the bottom end of the second cutting tooth 91, that is, the third cutting tooth 71 is at the same height as the second cutting tooth 91 or is relatively closer to the bottom of the well. In this embodiment, a row of third cutting teeth 71 on the blade wing 7 away from the side of the sheathing structure 9 is 1.5 mm lower than the bottom end of the second cutting tooth 91. Under normal drilling conditions, the third cutting teeth 71 participate in cutting the formation and do not affect the mechanical drilling speed of the drill bit. When in a soft and hard interlayer, the drill bit is too deep, the torque fluctuates greatly, and the teeth are easily broken, the second cutting teeth 91 actively scrape the formation, thereby protecting the outer row of teeth of the cone 3 from broken and wear, protecting the sealing of the bearing, and improving the overall life of the drill bit.
[0036] See also Figure 1 and Figure 2As shown, in some optional embodiments, the protective structure 9 and the bottom surface of the drill bit body 1 may have a third gap 92, that is, in this embodiment, the side of the protective structure 9 is connected to the blade 7 as a whole, and the top surface of the protective structure 9 is spaced from the drill bit body 1, so that the third gap 92 between the protective structure 9 and the drill bit body 1 can also be used for chip removal, and the added protective structure 9 will not occupy a larger chip removal space of the drill bit, and there may be a fourth gap 93 between the protective structure 9 and the cone 3, and the fourth gap 93 can be connected with the third gap 92, so that the rock chips located on the left side of the cone 3 can enter the fourth gap 93 from the third gap 92, and then enter the gap between the drill bit body 1 and the well wall from the fourth gap 93 upward, and be discharged upward. In this embodiment, the fourth gap 93 is connected with the first gap 5, and the rock chips enter the first gap 5 through the fourth gap 93, and then are discharged upward from the side opening of the first gap 5.
[0037] See also Figure 1 and Figure 2 As shown, further, the minimum distance between the wrapping structure 9 and the supporting structure 4 can be greater than or equal to the maximum diameter of the gear 3. In this embodiment, the closer to the outside, the smaller the distance between the wrapping structure 9 and the supporting structure 4, so that the wrapping structure 9 and the supporting structure 4 are closest to the gear 3 near the outside, and at the same time, they are also closest to the outer row of teeth 31, and can share the force of the outer row of teeth 31. At the same time, it is convenient for the installation of the gear 3 and the tooth palm 2. In this embodiment, the minimum distance between the wrapping structure 9 and the gear 3 is preferably 3mm.
[0038] In this embodiment, the first cutting teeth 41, the second cutting teeth 91 and the third cutting teeth 71 can all be selected from various pointed, axe-shaped, conical, cylindrical or plow-shaped diamond composite pieces, and the outer row of teeth 31 can be selected from spoon-shaped, wedge-shaped or conical spherical cemented carbide teeth.
[0039] The principle of a long-life hybrid drill bit provided by an embodiment of the present invention is:
[0040] Since at least one of the wrapping structure 9 or the supporting structure 4 is arranged on one side of the cone 3, when the wrapping structure 9 is arranged on one side of the cone 3, the wrapping structure 9 can contact the well wall or the well bottom to protect the outer row of teeth 31, the back cone 32 and the palm tip 21 of the cone 3; when the supporting structure 4 is arranged on one side of the cone 3, the bottom surface of the supporting structure 4 can be supported on the well bottom, and bear the force together with the outer row of teeth 31 to share the squeezing of the outer row of teeth 31 by the well bottom, and the first cutting teeth 41 fixed on the supporting structure 4 can support the well wall and share the well bottom. The wall squeezes the pressure back cone 32 and the palm tip 21, protects the back cone 32 and the palm tip 21 of the cone 3, and thus reduces the stress on the outer row of teeth 31, the back cone 32 and the palm tip 21, so that the wrapping structure 9 or the supporting structure 4 can protect the circumferential area P formed by the outer row of teeth 31, the back cone 32 and the palm tip 21 of the cone 3, effectively avoiding direct wear of the outer row, back cone 32 and palm tip 21 of the cone 3 by the well wall or the well bottom, and avoiding premature failure of the seal of the cone 3, thereby improving the life of the drill bit bearing, and then improving the life of the drill bit.
[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0042] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0043] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A long-life hybrid drill bit, characterized in that: It includes: Drill bit body (1); A tooth palm (2), one end of which is fixed to the drill bit body (1), and the other end of which is provided with a cone (3), and the surface of the cone (3) is fixedly provided with an outer row of teeth (31); A support structure (4) is located on one side of the cone (3); a first cutting tooth (41) is arranged on the outer side of the support structure (4); the support structure (4) and the first cutting tooth (41) are used to protect the outer row of teeth (31) of the cone (3), the back cone (32) and the palm tip (21) of the cone (3); and a protective structure (9) located on the other side of the cone (3), the protective structure (9) being used to protect the outer row of teeth (31) of the cone (3), the back cone (32) and the palm tip (21) of the cone (3), and at least one of the protective structure (9) or the supporting structure (4) is arranged on one side of the cone (3); At least two blades (7) are fixedly provided at the end of the drill bit body (1), and the protective structure (9) is formed by extending from one side of the blade (7) toward the direction close to the cone (3), and the outer surface of the protective structure (9) is coplanar with the outer surface of the blade (7); The wrapping structure (9) has an outer side surface and a bottom surface connected to the outer side surface, and a second cutting tooth (91) is provided at a corner where the outer side surface and the bottom surface are connected, and when the drill bit body (1) is located in a well, the distance between the second cutting tooth (91) and the well bottom or well side wall is 0 to 4 mm; when drilling, the side surface of the second cutting tooth (91) contacts the well wall before the back cone (32) and the palm tip (21) of the cone (3); A third cutting tooth (71) is installed at the bottom of the blade wing (7), and along the axial direction of the drill bit body (1), the height of the bottom end of the third cutting tooth (71) is equal to or lower than the height of the bottom end of the second cutting tooth (91).
2. The long-life hybrid drill bit according to claim 1, characterized in that: A first gap (5) is provided between the tooth palm (2) and the drill bit body (1), a second gap (6) is provided between the support structure (4) and the cone (3), and the second gap (6) is connected to the first gap (5).
3. The long-life hybrid drill bit according to claim 2, characterized in that: Along the radial direction of the drill bit body (1), the thickness of the support structure (4) gradually decreases from the outside to the inside, and the second gap (6) gradually increases from the outside to the inside.
4. The long-life hybrid drill bit according to claim 1, characterized in that: When the drill bit body (1) is located in a well, the distance between the first cutting tooth (41) and the well bottom or well side wall is 0 to 4 mm.
5. The long-life hybrid drill bit according to claim 1, characterized in that: The blade wing (7) and the support structure (4) are arranged at intervals, and along the radial direction of the drill bit body (1), the gap between the blade wing (7) and the support structure (4) gradually decreases, and a nozzle (8) is arranged between the blade wing (7) and the support structure (4).
6. The long-life hybrid drill bit according to claim 1, characterized in that: A third gap (92) is provided between the sheathing structure (9) and the bottom surface of the drill bit body (1), and a fourth gap (93) is provided between the sheathing structure (9) and the cone (3), and the fourth gap (93) is connected to the third gap (92).
7. The long-life hybrid drill bit according to claim 1, characterized in that: The minimum distance between the wrapping structure (9) and the supporting structure (4) is greater than or equal to the maximum diameter of the cone (3).