Four-bladed PDC bit

Abstract

The utility model belongs to the technical field of PDC drill bit, specifically provides a four cutter wing PDC drill bit, including drill bit body, four detachable mounting blocks and the fastener for realizing the detachable connection of mounting block and cutter wing. The tail of the cutter wing of drill bit body is provided with a mounting groove, the mounting block is contained in the mounting groove, the mounting block is provided with a crushing tooth, when the rock block falls, the crushing tooth can crush the rock block, and the drill is prevented from being stuck. When the PDC drill bit is worn to the extent of scrap, and the crushing tooth is still relatively new, the mounting block can be removed, and the mounting block is installed on other drill bits for continuous use. By such setting, the PDC drill bit can have the function of preventing the drill from being stuck, efficient construction is ensured, and resource waste caused by setting additional crushing teeth is avoided.

Description

Technical Field

[0001] This application belongs to the field of PDC drill bit technology, specifically a four-blade PDC drill bit. Background Technology

[0002] PDC drill bits are a commonly used type of drill bit in oil drilling operations, suitable for drilling in soft to medium-hard formations. During drilling operations, if encountering fragile, fractured, or geologically heterogeneous formations, rocks on the wellbore may break off and fall to the bottom of the well, causing the drill bit to get stuck. Stuck drill bits prevent the drill bit from being pulled out smoothly, affecting drilling efficiency.

[0003] To address the problem of stuck drill bits, existing technology includes PDC drill bits designed to prevent stuck drill bits. These bits feature PDC breakers at the tail end of the cutter blades (the upward-facing end during drilling). These breakers rotate at high speed with the drill bit, breaking up falling rock fragments and preventing stuck drill bits. However, in existing technology, the breakers, like the cutting teeth on the cutter blades, are integrally fixed to the blades. Since the probability of stuck drill bits occurring in actual operation is still relatively low, fixing the breakers integrally to the blades means that, in stable formations, the drill bit might wear down to the point of failure before stuck drill bits occur. In this case, the breakers, still relatively new, must be scrapped along with the drill bit. Since the breakers are made of high-hardness, high-wear-resistant polycrystalline diamond composite sheets, direct scrapping would be a waste of resources. On the other hand, without breakers, if a stuck drill bit occurs, ground operators would spend significantly more time and resources to resolve the problem, resulting in substantial losses.

[0004] Therefore, it is necessary to design a PDC drill bit that can prevent jamming without wasting resources. Utility Model Content

[0005] Based on the above-mentioned technical problems, this application provides a four-blade PDC drill bit that can prevent drill jamming and avoid resource waste.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a four-blade PDC drill bit, comprising: The drill bit body has four cutting wings, which extend from the crown of the drill bit body to the gauge protection portion of the drill bit body. The portion of the cutting wing located in the gauge protection portion has a mounting groove, which passes through the end of the cutting wing away from the crown along the axial direction of the drill bit body. Four mounting blocks are correspondingly disposed in the mounting slots, and each mounting block has a breaking tooth at the end opposite to the crown; and Fasteners are detachably connected between the mounting block and the blade.

[0007] In one possible implementation, the portion of the breaking tooth protruding from the mounting block is tapered.

[0008] In one possible implementation, a first mounting hole is provided on one side of the mounting block, and a second mounting hole corresponding to the first mounting hole is provided on the side wall of the mounting groove. The fastener passes through the second mounting hole and is threadedly connected to the first mounting hole.

[0009] In one possible implementation, the second mounting hole is a countersunk hole, and the fastener is accommodated in the second mounting hole.

[0010] In one possible implementation, the mounting block is provided with a plurality of the breaking teeth at intervals.

[0011] In one possible implementation, the breaking teeth are polycrystalline diamond composite sheets.

[0012] In one possible implementation, four blades are equally spaced along the circumference of the drill body, and chip removal grooves are formed between adjacent blades. A cutting block is also provided at the center of the crown of the drill body. The cutting block has four extensions, which are alternately arranged with the blades in the circumferential direction. The four extensions extend radially along the drill body to the corresponding chip removal grooves. The extensions and the blades are each provided with a plurality of cutting teeth spaced apart along their own length.

[0013] In one possible implementation, the crown of the drill bit body is provided with a plurality of water holes, which are connected to the internal flow channels of the drill bit body, and each chip removal groove has at least one water hole.

[0014] In one possible implementation, a water hole is also provided between two adjacent extensions.

[0015] In one possible implementation, the portion of the blade located in the diameter-maintaining section is provided with diameter-maintaining teeth.

[0016] Compared with the prior art, the advantages of the four-blade PDC drill bit provided in this application are: The four-blade PDC drill bit provided in this application includes a drill bit body, four detachable mounting blocks, and fasteners for detachably connecting the mounting blocks to the blades. The tail of each blade in the drill bit body has a mounting groove, within which the mounting blocks are housed. Each mounting block is equipped with rock-breaking teeth, which break the rock when it encounters falling rocks, preventing the drill from getting stuck. When the PDC drill bit is worn to the point of being unusable, but the rock-breaking teeth are still relatively new, the mounting blocks can be removed and installed on other drill bits for continued use. This design provides the PDC drill bit with anti-jamming functionality, ensuring efficient construction, without wasting resources due to the additional rock-breaking teeth. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of the PDC drill bit provided in the embodiments of this application. Figure 1 ; Figure 2 This is an exploded assembly view of the mounting block, fasteners, and drill bit body in an embodiment of this application; Figure 3 A schematic diagram of the structure of the PDC drill bit provided in the embodiments of this application. Figure 2 ; Figure 4 A schematic diagram of the structure of the PDC drill bit provided in the embodiments of this application. Figure 3 ; Figure 5 A schematic diagram of the structure of the PDC drill bit provided in the embodiments of this application. Figure 4 ; Explanation of reference numerals in the attached figures: 10. Drill bit body; 11. Cutting blade; 111. Cutting tooth; 112. Gauge protection tooth; 12. Mounting groove; 121. Second mounting hole; 13. Cutting block; 131. Extension; 14. Water hole; 20. Mounting block; 21. Breaking tooth; 22. First mounting hole; 30. Fastener. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do 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, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Please refer to the following: Figures 1 to 5 The following describes the four-blade PDC drill bit provided in the embodiments of this application.

[0025] This application provides a four-blade PDC drill bit, including a drill bit body 10, mounting blocks 20, and fasteners 30. The drill bit body 10 has four blades 11 extending from the crown of the drill bit body 10 to the gauge protection section. The portion of the blade 11 located in the gauge protection section has a mounting groove 12, which extends axially through the end of the blade 11 opposite to the crown. Four mounting blocks 20 are correspondingly disposed in the mounting grooves 12, and the end of each mounting block 20 opposite to the crown has a breaking tooth 21. The fasteners 30 are detachably connected between the mounting blocks 20 and the blades 11. The portion of the blade 11 located in the gauge protection section has a gauge protection tooth 112.

[0026] Compared with the prior art, the beneficial effects of the four-blade PDC drill bit provided in this application embodiment are: The four-blade PDC drill bit provided in this embodiment includes a drill bit body 10, four detachable mounting blocks 20, and fasteners 30 for detachably connecting the mounting blocks 20 to the blades 11. The tail of the blades 11 of the drill bit body 10 has a mounting groove 12, and the mounting blocks 20 are housed within the mounting groove 12. Each mounting block 20 is equipped with a breaking tooth 21. When encountering falling rock, the breaking tooth 21 can break the rock, preventing the drill from getting stuck. When the PDC drill bit is worn to the point of being unusable, but the breaking tooth 21 is still relatively new, the mounting block 20 can be removed and installed on another drill bit for continued use. This design enables the PDC drill bit to have an anti-jamming function, ensuring efficient construction, without wasting resources due to the additional breaking tooth 21.

[0027] Four cutting blades 11 are fixedly mounted on the drill bit body 10. Both the drill bit body 10 and the cutting blades 11 are existing technologies, and there are no specific limitations on the material, size, or structural form of the drill bit body 10 and the cutting blades 11. A mounting groove 12 is provided at the tail end of the cutting blade 11, i.e., the end facing upwards during operation. The mounting groove 12 can be obtained by milling, and a mounting block 20 is detachably mounted within the mounting groove 12. The shape and size of the mounting groove 12 should correspond to the mounting block 20 to ensure that the mounting block 20 does not easily wobble after being fixed. The cross-sectional shape of the mounting block 20 can be square, cylindrical, T-shaped, or other shapes. Specifically, the diameter of the drill bit body 10 can be 168 mm.

[0028] Mounting block 20 can be made of existing metal materials. The material of mounting block 20 can be the same as or different from that of blade 11.

[0029] In order to achieve the connection and fixation between the mounting block 20 and the blade 11, a first mounting hole 22 is provided on one side of the mounting block 20, and a second mounting hole 121 corresponding to the first mounting hole 22 is provided on the side wall of the mounting groove 12. The first mounting hole 22 is a threaded hole, and the second mounting hole 121 can be a smooth hole or a threaded hole. The fastener 30 is a bolt, which passes through the second mounting hole 121 and is threadedly connected to the first mounting hole 22.

[0030] To improve connection strength, multiple mounting holes 22, 121, and fasteners 30 can be provided. Considering that the drill body 10 will vibrate during operation, to prevent the fasteners 30 from loosening, a special thread-locking adhesive can be applied to the threaded section of the fasteners 30 during installation. Alternatively, after tightening the fasteners 30, the nut and the blade 11 can be spot-welded together, and the weld can be cut off when removal is required.

[0031] like Figure 1 and Figure 2As shown, the mounting block 20 is provided with two, three or more breaking teeth 21 at intervals. The breaking teeth 21 are fixed to the mounting block 20 by welding. The part of the breaking teeth 21 protruding from the mounting block 20 is conical. The material of the breaking teeth 21 is the same as that of the cutting teeth 111. Both are existing polycrystalline diamond composite sheets, which have the characteristics of high hardness and high wear resistance.

[0032] To prevent the nut of fastener 30 from protruding from the blade 11, the second mounting hole 121 is a countersunk hole, and the nut of fastener 30 is accommodated in the second mounting hole 121.

[0033] Considering that the number of cutter wings 11 in the four-wing PDC drill bit is less than that in the existing five-wing and six-wing drill bits, although the smaller number of cutter wings 11 results in a larger chip flute size, which helps to remove rock cuttings in time and reduce mud packing, the smaller number of cutter wings 11 also leads to poorer drill bit stability, making it more susceptible to vibration and impact.

[0034] To improve the stability of the four-blade PDC drill bit, please refer to [link / reference needed]. Figure 3 , Figure 4 and Figure 4 Four blades 11 are equally spaced along the circumference of the drill bit body 10, and chip removal grooves are formed between adjacent blades 11. A cutting block 13 is also provided at the center of the crown of the drill bit body 10. The cutting block 13 has four extensions 131. The extensions 131 and the blades 11 are alternately arranged in the circumferential direction. An appropriate distance should be maintained between the extensions 131 and the blades 11 so that rock chips can be discharged and chip accumulation can be avoided.

[0035] Four extensions 131 extend radially along the drill bit body 10 to the corresponding chip removal grooves. The extensions 131 and the blades 11 are provided with multiple cutting teeth 111 at intervals along their own length direction. The protrusion height of the cutting teeth 111 on the extensions 131 is greater than that of the cutting teeth 111 on the blades 11, so that the cutting block 13 can enter the formation first during drilling.

[0036] This application provides a cutting block 13 at the center of the four blades 11. The cutting block 13 can drill into the center of the bottom of the rock. The hole generated by the cutting block 13 plays an auxiliary centering role for the entire drill bit, thereby improving the stability of the drill bit body 10 during the drilling and cutting operation.

[0037] To facilitate chip removal, the crown of the drill bit body 10 is provided with multiple water holes 14. The water holes 14 are connected to the internal flow channels of the drill bit body 10. Each chip removal groove has at least one water hole 14. A water hole 14 is also provided between two adjacent extensions 131. A nozzle can be installed in the water hole 14 to form a high-pressure water flow, which facilitates the flushing of the cut rock chips out of the chip removal groove.

[0038] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A four-blade PDC drill bit, characterized in that, include: The drill bit body (10) has four blades (11), which extend from the crown of the drill bit body (10) to the gauge protection section. The blades (11) have a mounting groove (12) at the gauge protection section. The mounting groove (12) passes through the end of the blades (11) away from the crown along the axial direction of the drill bit body (10). Four mounting blocks (20) are respectively disposed in the mounting slots (12), and each mounting block (20) has a breaking tooth (21) at the end opposite to the crown; and Fastener (30) is detachably connected between the mounting block (20) and the blade (11).

2. The four-blade PDC drill bit according to claim 1, characterized in that, The portion of the breaking tooth (21) that protrudes from the mounting block (20) is conical.

3. The four-blade PDC drill bit according to claim 1, characterized in that, The mounting block (20) has a first mounting hole (22) on one side, and the mounting groove (12) has a second mounting hole (121) on the side wall that is coaxial with the first mounting hole (22). The fastener (30) passes through the second mounting hole (121) and is threadedly connected to the first mounting hole (22).

4. The four-blade PDC drill bit according to claim 3, characterized in that, The second mounting hole (121) is a countersunk hole, and the fastener (30) is accommodated in the second mounting hole (121).

5. The four-blade PDC drill bit according to claim 1, characterized in that, The mounting block (20) is provided with a plurality of the breaking teeth (21) at intervals.

6. The four-blade PDC drill bit according to claim 1 or 5, characterized in that, The breaking tooth (21) is a polycrystalline diamond composite sheet.

7. The four-blade PDC drill bit according to claim 1, characterized in that, The four blades (11) are equally spaced along the circumference of the drill body (10), and chip removal grooves are formed between adjacent blades (11). A cutting block (13) is also provided at the center of the crown of the drill body (10). The cutting block (13) has four extensions (131). The extensions (131) and the blades (11) are alternately arranged in the circumferential direction. The four extensions (131) extend radially along the drill body (10) to the corresponding chip removal groove. The extensions (131) and the blades (11) are respectively provided with multiple cutting teeth (111) spaced apart along their own length direction.

8. The four-blade PDC drill bit according to claim 7, characterized in that, The crown of the drill bit body (10) is provided with a plurality of water holes (14), which are connected to the internal flow channels of the drill bit body (10), and each chip removal groove has at least one water hole (14).

9. The four-blade PDC drill bit according to claim 8, characterized in that, The water hole (14) is also provided between two adjacent extensions (131).

10. The four-blade PDC drill bit according to claim 9, characterized in that, The blade (11) is provided with a diameter-protecting tooth (112) on the portion of the diameter-protecting part.

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