Rolling torque-stable PDC bit
By installing a rolling torque stabilizer in the rear row area of the PDC drill bit cutter blade, the problem of drill bit damage caused by torque feedback vibration in complex formations is solved, achieving stable cutting and extending the service life of the drill bit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOPEC OILFIELD SERVICE CORPORATION
- Filing Date
- 2025-08-29
- Publication Date
- 2026-07-10
AI Technical Summary
Existing PDC drill bits are prone to damage due to torque feedback vibration under complex formation conditions, especially in formations with alternating soft and hard surfaces, where jamming and slippage occur, affecting directional drilling efficiency.
A rolling torque stabilizer is installed in the rear row area of the PDC drill bit's cutter blades. This converts rolling friction into sliding friction, limits the cutting depth, reduces rock-breaking torque and friction, and prevents excessive instantaneous torque.
It effectively prevents excessive instantaneous torque from being generated by changes in the environment, reduces the risk of tooth breakage, extends the service life of the drill bit, and improves the tool face stability and mechanical drilling speed in directional drilling.
Smart Images
Figure CN224478886U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil drilling technology, and more specifically, to a rolling torque-stabilizing PDC drill bit. Background Technology
[0002] In existing technologies, PDC (Polycrystalline Diamond Compact) drill bits are commonly used rock-breaking tools in drilling engineering. Due to their high hardness, high wear resistance, and self-sharpening ability, they are widely used in soft to medium-hard formations. However, PDC drill bits still face many challenges under complex formation conditions. Due to the complexity of the formation, especially when encountering formations with alternating soft and hard surfaces, the depth to which the PDC drill bit penetrates the formation changes frequently, leading to increased torque feedback vibration. In severe cases, excessive cutting depth by the PDC drill bit may cause excessive driving torque, which may momentarily fail to drive the drill bit to rotate, resulting in a "jamming-slipping" phenomenon. The severe torque fluctuations can damage the drill bit. In addition, during directional drilling operations, large torque fluctuations in PDC drill bits can lead to tool face instability, affecting the efficiency of directional drilling.
[0003] In summary, how to prevent excessive instantaneous torque from the drill bit due to changes in the drilling environment, reduce the risk of tooth breakage, and at the same time reduce the drill bit's rock-breaking torque and friction to extend its service life is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0004] In view of this, the purpose of this utility model is to provide a rolling torque-stabilizing PDC drill bit, which can prevent excessive instantaneous torque from being generated by the drill bit due to changes in the drilling environment, reduce the risk of tooth breakage, and at the same time reduce the rock-breaking torque and friction of the drill bit, thus extending the service life of the drill bit.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A rolling torque-stabilizing PDC drill bit, comprising:
[0007] The drill bit body has multiple cutter wings arranged sequentially and spaced apart at its end;
[0008] PDC cutting teeth, each of the cutting blades has multiple PDC cutting teeth in the front row area, the drill rod of the drill bit body is connected to the drive device to drive the PDC cutting teeth to break the formation and form a borehole, and each cutting blade is provided with a chip removal groove for discharging the broken formation out of the borehole;
[0009] A rolling torque stabilizer is tumblingly disposed in the rear row area of the blade, with the top of the rolling torque stabilizer being higher than the rear row area. The outer periphery of the rolling torque stabilizer is used to roll into contact with the ground layer to convert the sliding friction between the blade and the ground layer into rolling friction.
[0010] In one embodiment, the rolling torque stabilizer is fixed in the rear row area by brazing, sintering, gluing or snapping.
[0011] In one embodiment, the drill bit body comprises a steel component.
[0012] In one embodiment, the rolling torque stabilizing element is provided in the rear row region of at least two of the blades, and the blades provided with the rolling torque stabilizing element are spaced apart; or the rolling torque stabilizing element is provided in the rear row region of each blade.
[0013] In one embodiment, the rolling torque stabilizer includes a first bearing base disposed in the rear row area, a first upper end cap disposed on the first bearing base, and a cylindrical first rolling element. The first bearing base has a first receiving cavity for accommodating the first rolling element, and the first upper end cap has a first through hole aligned with and communicating with the top of the first receiving cavity. The first rolling element is rotatably disposed in the first receiving cavity through the first through hole, and the top of the first rolling element is higher than the top of the first upper end cap.
[0014] In one embodiment, the rolling torque stabilizer includes a left end base located in the rear row area, a right end base located in the rear row area, and a cylindrical second rolling element. The left end base and the right end base are connected to form a second receiving cavity for accommodating the second rolling element. The second rolling element is rotatably disposed in the second receiving cavity, and the top of the second rolling element is higher than the top of the left end base.
[0015] In one embodiment, the rolling torque stabilizer includes a second bearing base disposed in the rear row area, a bearing bush disposed on one side of the second bearing base, and a cylindrical third rolling element. The second bearing base is provided with a third receiving cavity for accommodating the bearing bush and the third rolling element.
[0016] The upper part of the bearing bush is clearance-fitted with the cylindrical surface of the third rolling element, and the lower part of the bearing bush is clearance-fitted with the inner wall of the second bearing base, so that the third rolling element is rotatably disposed in the third receiving cavity, and the top of the third rolling element is higher than the top of the second bearing base.
[0017] In one embodiment, the bearing bush is brazed or bonded to the second bearing base.
[0018] In one embodiment, the rolling torque stabilizer includes a third bearing base disposed in the rear row area, a second upper end cap disposed on the third bearing base, and a spherical fourth rolling element. The third bearing base has a fourth receiving cavity for accommodating the fourth rolling element. The second upper end cap has a second through hole aligned with and communicating with the top of the fourth receiving cavity. The fourth rolling element is rotatably disposed in the fourth receiving cavity through the second through hole, and the top of the fourth rolling element is higher than the top of the second upper end cap.
[0019] In one embodiment, a cooling and lubrication system connected to an internal channel of the drill pipe is further included, the cooling and lubrication system being used to deliver drilling fluid to the PDC cutting teeth through the internal channel.
[0020] When using the rolling torque-stabilizing PDC drill bit provided by this utility model, the end of the drill bit body is provided with multiple sequentially arranged and spaced-apart blades. The front row area of each blade (i.e., the area that first contacts the formation) is provided with multiple PDC cutting teeth, and the rear row area of the blade (i.e., the area that later contacts the formation) is provided with rolling torque-stabilizing elements. The drill rod of the drill bit body is connected to the drive device. When the drive device is running, it can drive the drill rod to rotate, thereby driving the PDC cutting teeth to break the formation and form a borehole. Moreover, each blade is provided with a chip removal groove for discharging the broken formation out of the borehole to avoid obstruction of the operation of the PDC cutting teeth in breaking the formation.
[0021] By installing rolling torque stabilizers in the rear area of the cutter blades, these stabilizers achieve rolling friction with the formation while preventing them from detaching from the rear area. Furthermore, the specific location of the rolling torque stabilizers can be flexibly arranged according to the different tooth layouts of the PDC drill bit. The rolling torque stabilizers effectively limit the cutting depth of the PDC drill bit, preventing excessive cutting contact with the formation by the PDC cutting teeth. This keeps the depth of the PDC cutting teeth within a safe threshold range, avoiding tooth breakage caused by excessive instantaneous torque due to changes in the drilling environment. It also reduces rock-breaking torque and drill bit friction, mitigating stick-slip phenomena.
[0022] Furthermore, the rolling torque stabilizer makes rolling contact with the formation. Compared to traditional fixed cutting depth limiting elements, the rolling torque stabilizer transforms the static friction between the element and the formation into dynamic friction, reducing contact resistance. The rolling characteristic of the rolling torque stabilizer allows the entire outer periphery of the element to contact the formation, thus reducing wear. Therefore, by rotating the rolling torque stabilizer in the rear row area of the cutter blade, excessive instantaneous torque can be prevented from being generated in the PDC drill bit due to changes in the drilling environment, reducing the risk of tooth breakage. At the same time, it reduces the rock-breaking torque and friction of the PDC drill bit. During directional drilling, the rolling torque stabilizer helps maintain tool face stability, improves the overall mechanical drilling rate, and extends the service life of the PDC drill bit.
[0023] In summary, the rolling torque-stabilizing PDC drill bit provided by this utility model can prevent excessive instantaneous torque from being generated by the drill bit due to changes in the drilling environment, reduce the risk of tooth breakage, and at the same time reduce the rock-breaking torque and friction of the drill bit, thus extending the service life of the drill bit. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of the rolling torque-stabilizing PDC drill bit provided by this utility model;
[0026] Figure 2 for Figure 1 Top view;
[0027] Figure 3 An exploded view of a first embodiment of the rolling torque stabilizer;
[0028] Figure 4 A schematic diagram of the structure of a first embodiment of a rolling torque stabilizer;
[0029] Figure 5 An exploded view of a second embodiment of the rolling torque stabilizer;
[0030] Figure 6 A schematic diagram of a second embodiment of a rolling torque stabilizer;
[0031] Figure 7 An exploded view of a third embodiment of the rolling torque stabilizer;
[0032] Figure 8 A schematic diagram of a third embodiment of a rolling torque stabilizer;
[0033] Figure 9 An exploded view of the fourth embodiment of the rolling torque stabilizer;
[0034] Figure 10 This is a schematic diagram of the fourth embodiment of the rolling torque stabilizer.
[0035] Figures 1-10 middle:
[0036] 1 is a rolling torque stabilizer, 2 is a PDC cutting tooth, 3 is the drill bit body, A1 is the first rolling element, A2 is the first upper end cap, A3 is the first bearing base, B1 is the second rolling element, B2 is the left end base, B3 is the right end base, C1 is the third rolling element, C2 is the bearing bush, C3 is the second bearing base, D1 is the fourth rolling element, D2 is the second upper end cap, and D3 is the third bearing base. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0038] The core of this invention is to provide a rolling torque-stabilizing PDC drill bit, which can prevent excessive instantaneous torque from being generated by the drill bit due to changes in the drilling environment, reduce the risk of tooth breakage, and at the same time reduce the rock-breaking torque and friction of the drill bit, thus extending the service life of the drill bit.
[0039] Please refer to Figure 1 and Figure 2 This specific embodiment provides a rolling torque-stabilizing PDC drill bit, comprising:
[0040] The drill bit body 3 has multiple cutter wings arranged sequentially and spaced apart at its end;
[0041] PDC cutting teeth 2, each blade has multiple PDC cutting teeth 2 in the front row area, the drill rod of the drill body 3 is connected to the drive device to drive the PDC cutting teeth 2 to break the formation and form a borehole, each blade is provided with a chip removal groove for discharging the broken formation out of the borehole.
[0042] The rolling torque stabilizer 1 is rolled in the rear row area of the blade, and the top of the rolling torque stabilizer 1 is higher than the rear row area. The outer periphery of the rolling torque stabilizer 1 is used to roll in contact with the ground to convert the sliding friction between the blade and the ground into rolling friction.
[0043] It should be noted that the drive unit and drill pipe enable the drill bit body 3 to rotate at a certain speed. The PDC cutting teeth 2, acting as cutting edges, rotate together with the drill bit body 3 and cut into the formation. The sharp edges of the PDC cutting teeth 2 scrape the formation surface, gradually breaking up hard materials such as rocks. The PDC cutting teeth 2 are responsible for directly breaking up rocks and forming the bottom of the hole. Moreover, the material of the PDC cutting teeth 2 (polycrystalline diamond composite sheet) determines its wear resistance and thermal stability, while the shape of the cutting blades, the arrangement of the cutting blade teeth (such as a double-row tooth design), and the cutting angle need to be optimized according to the formation characteristics. For example, the cutting blades can be set with a fishtail-shaped crown to reduce the risk of mud packing, or the cutting blades can be set with a short parabolic crown to improve adaptability to hard interlayers.
[0044] In practical applications, the shape, structure, size, material, number, and position of the drill bit body 3, PDC cutting teeth 2, and rolling torque stabilizer 1 can be determined according to the actual situation and needs.
[0045] When using the rolling torque-stabilizing PDC drill bit provided by this utility model, the drill bit body 3 has multiple sequentially arranged and spaced-apart blades at its end. The front row area of each blade (i.e., the area that first contacts the formation) has multiple PDC cutting teeth 2, and the rear row area of the blade (i.e., the area that later contacts the formation) has rolling torque-stabilizing elements 1. The drill rod of the drill bit body 3 is connected to the drive device. When the drive device is running, it can drive the drill rod to rotate, thereby driving the PDC cutting teeth 2 to break the formation and form a borehole. Moreover, each blade is provided with a chip removal groove for discharging the broken formation out of the borehole to avoid obstruction of the operation of the PDC cutting teeth 2 in breaking the formation.
[0046] By installing a rolling torque stabilizer 1 in the rear area of the cutter wing, the rolling torque stabilizer 1 can achieve rolling friction with the formation while ensuring that it does not fall off from the rear area of the cutter wing. Moreover, the specific position of the rolling torque stabilizer 1 can be flexibly installed and arranged according to the different tooth layout of the PDC drill bit. The rolling torque stabilizer 1 can effectively limit the cutting depth of the PDC drill bit, prevent the PDC cutting teeth 2 from excessively cutting into the formation, limit the depth of the PDC cutting teeth 2 into the formation within a safe threshold range, avoid tooth breakage caused by excessive instantaneous torque due to changes in the drilling environment, and also reduce rock breaking torque and drill bit friction, thus mitigating stick-slip phenomenon.
[0047] Furthermore, the rolling torque stabilizer 1 makes rolling contact with the formation. Compared to traditional fixed cutting depth limiting elements, the rolling torque stabilizer 1 transforms the static friction between itself and the formation into dynamic friction, reducing contact resistance. The rolling characteristic of the rolling torque stabilizer 1 allows its entire outer periphery to contact the formation, thus reducing wear. Therefore, by rotating the rolling torque stabilizer 1 in the rear row area of the cutter blade, excessive instantaneous torque generated by the PDC drill bit due to changes in the drilling environment can be prevented, reducing the risk of tooth breakage. At the same time, it reduces the rock-breaking torque and friction of the PDC drill bit. During directional drilling, the rolling torque stabilizer 1 helps maintain tool face stability, improves the overall mechanical drilling rate, and extends the service life of the PDC drill bit.
[0048] In summary, the rolling torque-stabilizing PDC drill bit provided by this utility model can prevent excessive instantaneous torque from being generated by the drill bit due to changes in the drilling environment, reduce the risk of tooth breakage, and at the same time reduce the rock-breaking torque and friction of the drill bit, thus extending the service life of the drill bit.
[0049] In one embodiment, the rolling torque stabilizer 1 is fixed to the rear row area by brazing, sintering, gluing, or snap-fitting. A slot can be provided in the rear row area of a portion of the cutter wings of the drill body 3 according to the size of the rolling torque stabilizer 1. The rolling torque stabilizer 1 can be fixed to the drill body 3 by brazing, sintering, gluing, or mechanical fixing. The specific structure of the rolling torque stabilizer 1 can also be appropriately modified according to the shape, spatial structure, and assembly method of the cutter wings, but it is necessary to ensure that the rolling torque stabilizer 1 can roll without detaching from the drill body 3.
[0050] In one embodiment, the drill bit body 3 includes steel components to ensure the structural stability and performance of the drill bit body 3.
[0051] In one embodiment, at least two blades have rolling torque stabilizing elements 1 in their rear regions, and the blades with rolling torque stabilizing elements 1 are spaced apart; or each blade has rolling torque stabilizing elements 1 in its rear region. The number and position of the rolling torque stabilizing elements 1 can be determined according to actual conditions and requirements during practical application.
[0052] In one embodiment, such as Figure 3 and Figure 4As shown, the rolling torque stabilizer 1 includes a first bearing base A3 located in the rear row area, a first upper end cap A2 located on the first bearing base A3, and a cylindrical first rolling element A1. The first bearing base A3 has a first receiving cavity for accommodating the first rolling element A1. The first upper end cap A2 has a first through hole aligned with and communicating with the top of the first receiving cavity. The first rolling element A1 is rotatably disposed within the first receiving cavity through the first through hole, and the top of the first rolling element A1 is higher than the top of the first upper end cap A2. Both the first bearing base A3 and the first upper end cap A2 are made of hard alloy material.
[0053] It should be noted that the first rolling element A1 is placed in the first bearing base A3 and fixed by brazing or other adhesive methods. For example... Figure 4 The first rolling element A1 shown can roll within the first receiving cavity during operation, resulting in uniform wear on the outer periphery of the first rolling element A1 and helping to extend its service life. Furthermore, the first upper end cap A2 effectively buffers the impact between the first rolling element A1 and the first bearing base A3. The first upper end cap A2 and the first bearing base A3 cooperate to fix the first rolling element A1. The inner end of the first bearing base A3 is a semi-cylindrical cavity or other shape that can partially enclose the first rolling element A1.
[0054] It should also be noted that the inner diameter of the semi-cylindrical cavity of the first bearing base A3 should be slightly larger than the diameter of the first rolling element A1, so that the first rolling element A1 can roll around its axis, which is located within the semi-cylindrical cavity of the first bearing base A3. The distance difference between the axis of the first rolling element A1 and the axis of the semi-cylindrical cavity is less than the difference between the diameter of the first bearing base A3 and the diameter of the first rolling element A1, so that the first rolling element A1 can be fixed in the first bearing base A3 and will not fall off. Furthermore, the inner wall of the carbide first bearing base A3 has an extended gap, the length of which is less than the diameter of the first rolling element A1, so that the first rolling element A1 is partially exposed rather than completely covered, allowing the outer periphery of the first rolling element A1 to contact the formation during drilling with the rolling torque-stabilizing PDC drill bit. When the first rolling element A1 contacts the formation and is subjected to tangential or frictional forces, the first rolling element A1 can rotate coaxially around its axis.
[0055] In one embodiment, such as Figure 5 and Figure 6As shown, the rolling torque stabilizer 1 includes a left-end base B2 located in the rear row area, a right-end base B3 located in the rear row area, and a cylindrical second rolling element B1. The left-end base B2 and the right-end base B3 are connected to form a second receiving cavity for accommodating the second rolling element B1. The second rolling element B1 is rotatably disposed within the second receiving cavity, and the top of the second rolling element B1 is higher than the top of the left-end base B2. Both the left-end base B2 and the right-end base B3 are made of hard alloy material.
[0056] It should be noted that the left base B2 and the right base B3 can be spliced and brazed to form a second receiving cavity, and the second rolling element B1 is placed in the second receiving cavity and fixed by brazing or other adhesive methods. Figure 6 As shown, the second receiving cavity formed by the left end base B2 and the right end base B3 is a semi-cylindrical or other arc-shaped structure. The inner diameter of the second receiving cavity is slightly larger than the diameter of the second rolling element B1, ensuring that the second rolling element B1 rotates coaxially around its axis within the semi-cylindrical space, and the offset between the axis of the second rolling element B1 and the axial direction of the semi-cylindrical space is less than the difference between the diameter of the second receiving cavity and the diameter of the second rolling element B1. During operation, the second rolling element B1 can roll within the second receiving cavity, achieving full circumferential wear and extending its service life. A specific gap is reserved in the second receiving cavity, allowing the top of the second rolling element B1 to protrude from the cavity. During drilling, the second rolling element B1 can reduce rock-breaking torque and drill bit friction.
[0057] In one embodiment, such as Figure 7 and Figure 8 As shown, the rolling torque stabilizer 1 includes a second bearing base C3 located in the rear row area, a bearing bush C2 located on one side of the second bearing base C3, and a cylindrical third rolling element C1. The second bearing base C3 has a third receiving cavity for accommodating the bearing bush C2 and the third rolling element C1. The upper part of the bearing bush C2 is clearance-fitted with the cylindrical surface of the third rolling element C1, and the lower part of the bearing bush C2 is clearance-fitted with the inner wall of the second bearing base C3, so that the third rolling element C1 is rotatably disposed in the third receiving cavity, and the top of the third rolling element C1 is higher than the top of the second bearing base C3. The second bearing base C3 is made of hard alloy material.
[0058] It should be noted that a semi-cylindrical cavity is provided inside the second bearing base C3, and a certain radial clearance is provided between the semi-cylindrical cavity and the third rolling element C1. This radial clearance is compensated by the bearing bush C2 to facilitate installation. Figure 8The upper part of the bearing C2 (i.e., the side of the bearing C2 that contacts the third rolling element C1) forms a clearance fit with the cylindrical surface of the PDC rolling element C1, and the lower part of the bearing C2 (i.e., the side of the bearing C2 that contacts the second bearing base C3) forms a clearance fit with the inner wall of the semi-cylindrical cavity of the second bearing base C3, realizing the coordinated control of the axial positioning and radial degree of freedom of the PDC cutting tooth 2. The third rolling element C1 is partially exposed and extends into the third receiving cavity. When the drill bit is drilling, the third rolling element C1 generates a tangential component force due to the reaction force of the formation. At this time, the bearing C2 and the second bearing base C3 rotate, allowing the third rolling element C1 to rotate coaxially around its own axis, so that the working surface of the PDC cutting tooth 2 produces adaptive rotation, effectively reducing the friction torque.
[0059] In one embodiment, the bearing bush C2 is brazed or bonded to the second bearing base C3. The fixing method of the bearing bush C2 can be determined according to the actual situation and requirements during practical application.
[0060] In one embodiment, such as Figure 9 and Figure 10 As shown, the rolling torque stabilizer 1 includes a third bearing base D3 located in the rear row area, a second upper end cap D2 located on the third bearing base D3, and a spherical fourth rolling element D1. The third bearing base D3 has a fourth receiving cavity for accommodating the fourth rolling element D1. The second upper end cap D2 has a second through hole aligned with and communicating with the top of the fourth receiving cavity. The fourth rolling element D1 is rotatably disposed within the fourth receiving cavity through the second through hole, and the top of the fourth rolling element D1 is higher than the top of the second upper end cap D2. Both the third bearing base D3 and the second upper end cap D2 are made of hard alloy material.
[0061] It should be noted that a ball-and-socket structure is provided on the top of the third bearing base D3. The inner diameter of the ball-and-socket structure forms a radial fit clearance with the outer diameter of the spherical fourth rolling element D1 (i.e., the universal ball). Simultaneously, a second upper end cap D2 is installed on the upper end of the third bearing base D3. This clearance fit fixes the position of the spherical fourth rolling element D1. Part of the fourth rolling element D1 protrudes from the third bearing base D3, and the exposed area of the fourth rolling element D1 directly contacts the formation and transmits the cutting load. During drilling, the spherical fourth rolling element D1 is subjected to contact force from the formation, simultaneously achieving rotation around its center, forming a composite adaptive rotation mode. Dynamic friction reduces contact resistance, significantly improving the stability of drill bit cutting and the tool face control accuracy under heterogeneous formation conditions.
[0062] Of course, in addition to the above four types of rolling torque stabilizer 1 assembly forms and installation methods, the structure and assembly of the rolling torque stabilizer 1 can also be determined according to the actual situation and actual needs in the actual application process. It is necessary to ensure that the rolling torque stabilizer 1 and the ground layer have rolling friction, and to ensure that the rolling torque stabilizer 1 will not fall off from the rear row area.
[0063] In one embodiment, a cooling and lubrication system connected to an internal channel of the drill pipe is also included. This system delivers drilling fluid to the PDC cutting teeth 2 through the internal channel. The cooling and lubrication system delivers drilling fluid to the PDC cutting teeth 2 through the internal channel of the drill pipe, achieving three functions: ① reducing the temperature of the PDC cutting teeth 2 to prevent overheating and failure; ② flushing away rock cuttings to avoid mud packing; and ③ lubricating the cutting interface of the PDC cutting teeth 2 to reduce wear.
[0064] It should be noted that the first bearing base A3, the second bearing base C3, the third bearing base D3, the first upper end cap A2, the second upper end cap D2, the first rolling element A1, the second rolling element B1, the third rolling element C1, the fourth rolling element D1, the first receiving cavity, the second receiving cavity, the third receiving cavity, the fourth receiving cavity, the first through hole, and the second through hole mentioned in this application are only distinguished by their different positions and do not have any order of priority.
[0065] In addition, it should be noted that the orientation or positional relationship indicated by "front and back", "left and right", etc. in this application is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the purpose of simplifying the description and making it easier to understand, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.
[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this utility model is within the protection scope of this utility model and will not be elaborated upon here.
[0067] The rolling torque-stabilizing PDC drill bit provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A rolling torque-stabilizing PDC drill bit, characterized in that, include: The drill bit body (3) has multiple cutter wings arranged sequentially and spaced apart at its end; PDC cutting teeth (2), each of the blades has multiple PDC cutting teeth (2) in the front row area, the drill rod of the drill body (3) is connected to the drive device to drive the PDC cutting teeth (2) to break the formation and form a borehole, and each blade is provided with a chip removal groove for discharging the broken formation outside the borehole; A rolling torque stabilizer (1) is rolled in the rear row area of the blade, and the top of the rolling torque stabilizer (1) is higher than the rear row area. The outer periphery of the rolling torque stabilizer (1) is used to roll in contact with the ground to convert the sliding friction between the blade and the ground into rolling friction.
2. The rolling torque-stabilizing PDC drill bit according to claim 1, characterized in that, The rolling torque stabilizer (1) is fixed in the rear row area by brazing, sintering, gluing or snap-fitting.
3. The rolling torque-stabilizing PDC drill bit according to claim 1, characterized in that, The drill bit body (3) includes steel components.
4. The rolling torque-stabilizing PDC drill bit according to claim 1, characterized in that, At least two of the blades have the rolling torque stabilizer (1) in their rear row area, and the blades with the rolling torque stabilizer (1) are spaced apart; or each of the blades has the rolling torque stabilizer (1) in its rear row area.
5. The rolling torque-stabilizing PDC drill bit according to any one of claims 1 to 4, characterized in that, The rolling torque stabilizer (1) includes a first bearing base (A3) disposed in the rear row area, a first upper end cap (A2) disposed on the first bearing base (A3), and a cylindrical first rolling element (A1). The first bearing base (A3) is provided with a first receiving cavity for accommodating the first rolling element (A1). The first upper end cap (A2) is provided with a first through hole aligned with and communicating with the top of the first receiving cavity. The first rolling element (A1) is rotatably disposed in the first receiving cavity through the first through hole, and the top of the first rolling element (A1) is higher than the top of the first upper end cap (A2).
6. The rolling torque-stabilizing PDC drill bit according to any one of claims 1 to 4, characterized in that, The rolling torque stabilizer (1) includes a left end base (B2) located in the rear row area, a right end base (B3) located in the rear row area, and a cylindrical second rolling element (B1). The left end base (B2) and the right end base (B3) are connected to form a second receiving cavity for accommodating the second rolling element (B1). The second rolling element (B1) is rotatably disposed in the second receiving cavity, and the top of the second rolling element (B1) is higher than the top of the left end base (B2).
7. The rolling torque-stabilizing PDC drill bit according to any one of claims 1 to 4, characterized in that, The rolling torque stabilizer (1) includes a second bearing base (C3) disposed in the rear row area, a bearing bush (C2) disposed on one side of the second bearing base (C3) and a cylindrical third rolling element (C1). The second bearing base (C3) is provided with a third receiving cavity for accommodating the bearing bush (C2) and the third rolling element (C1). The upper part of the bearing bush (C2) is clearance-fitted with the cylindrical surface of the third rolling element (C1), and the lower part of the bearing bush (C2) is clearance-fitted with the inner wall of the second bearing base (C3), so that the third rolling element (C1) is rotatably disposed in the third receiving cavity, and the top of the third rolling element (C1) is higher than the top of the second bearing base (C3).
8. The rolling torque-stabilizing PDC drill bit according to claim 7, characterized in that, The bearing bush (C2) is brazed or bonded to the second bearing base (C3).
9. The rolling torque-stabilizing PDC drill bit according to any one of claims 1 to 4, characterized in that, The rolling torque stabilizer (1) includes a third bearing base (D3) disposed in the rear row area, a second upper end cap (D2) disposed on the third bearing base (D3), and a spherical fourth rolling element (D1). The third bearing base (D3) is provided with a fourth receiving cavity for accommodating the fourth rolling element (D1). The second upper end cap (D2) is provided with a second through hole aligned with and communicating with the top of the fourth receiving cavity. The fourth rolling element (D1) is rotatably disposed in the fourth receiving cavity through the second through hole, and the top of the fourth rolling element (D1) is higher than the top of the second upper end cap (D2).
10. The rolling torque-stabilizing PDC drill bit according to any one of claims 1 to 4, characterized in that, It also includes a cooling and lubrication system connected to the internal channel of the drill pipe, the cooling and lubrication system being used to deliver drilling fluid to the PDC cutting teeth (2) through the internal channel.