Drill bit for drilling

Abstract

The utility model discloses a drill bit for drilling, and belongs to the technical field of drilling tools. The drill bit comprises a drill bit body, five blades are arranged on the drill bit body, a plurality of cutting teeth are arranged on the five blades, and the circumferential angle theta c, the front rake angle alpha and the side turning angle beta of all the cutting teeth are different. The circumferential angle theta c, the front inclination angle alpha and the lateral rotation angle beta of all the cutting teeth are different, so that lateral force and bending moment borne by the drill bit in the drilling process are more balanced, the vibration or drill jamming phenomenon can be reduced, the drilling effect of the drill bit is improved, and the damage rate and the loss cost of the drill bit are reduced.

Description

Technical Field

[0001] The utility model relates to a drill bit for drilling, belonging to the technical field of drilling tools. Background Technique

[0002] In the technical field of drilling equipment, diamond drill bits have become indispensable drilling tools in the fields of geological drilling, oil and gas exploration, etc. due to their advantages such as high hardness, high wear resistance and long service life. However, with the increase of drilling depth and the complexity of geological environment, the performance requirements for diamond drill bits are also getting higher and higher.

[0003] As shown in Table 1, for the commonly used five-wing and fourteen-tooth diamond drill bit at present, the rake angle α of all fourteen cutting teeth is 20°, the side rotation angle β is 15°, and the circumferential angle θc of some cutting teeth among the fourteen cutting teeth is the same. In actual application of this drill bit, due to the complexity and inhomogeneity of the formation structure, the drill bit often encounters various complex geological conditions during drilling, such as uneven hardness, hard rock formations, well-developed fractures, rock fragmentation, etc. These geological conditions will all cause uneven stress on the drill bit, and even large vibrations or sticking of the drill bit may occur, resulting in poor drilling effect, high drill bit damage rate and large loss cost. Content of the Utility Model

[0004] To solve the above technical problems, the utility model provides a drill bit for drilling.

[0005] The utility model is realized through the following technical solutions:

[0006] A drill bit for drilling, including a drill bit body, on which five cutter wings are provided, and a plurality of cutting teeth are provided on all five cutter wings, and the circumferential angle θ c , rake angle α and side rotation angle β of all of them are different.

[0007] Water holes are opened between every two adjacent cutter wings on the drill bit body.

[0008] The diameter of the drill bit body is 94 mm.

[0009] All the cutting teeth are diamond composite inserts, and the diameter of the diamond composite insert is 13 mm and the thickness is 2 mm.

[0010] The included angle between every two adjacent cutter wings among the five cutter wings is 72°.

[0011] The five cutter wings include a first cutter wing, a second cutter wing, a third cutter wing, a fourth cutter wing and a fifth cutter wing.

[0012] The first cutter wing is successively provided with a first cutting tooth and a second cutting tooth, and the second cutting tooth is arranged closer to the central axis of the drill bit body relative to the first cutting tooth.

[0013] The second cutting blade is successively provided with a third cutting tooth, a fourth cutting tooth and a fifth cutting tooth, and the fifth cutting tooth is arranged closer to the central axis of the drill bit body relative to the fourth cutting tooth.

[0014] The third cutting blade is successively provided with a sixth cutting tooth, a seventh cutting tooth and an eighth cutting tooth, and the eighth cutting tooth is arranged closer to the central axis of the drill bit body relative to the seventh cutting tooth.

[0015] The fourth cutting blade is successively provided with a ninth cutting tooth and a tenth cutting tooth, and the tenth cutting tooth is arranged closer to the central axis of the drill bit body relative to the ninth cutting tooth.

[0016] The fifth cutting blade is successively provided with an eleventh cutting tooth, a twelfth cutting tooth, a thirteenth cutting tooth and a fourteenth cutting tooth, and the fourteenth cutting tooth is arranged closer to the central axis of the drill bit body relative to the thirteenth cutting tooth.

[0017] The circumferential angles of the first cutting tooth to the fourteenth cutting tooth are successively -3.92°, 142.67°, 212.7°, 284.65°, -1.29°, 70.18°, 212.17°, 140.51°, -0.97°, 286.15°, 67.38°, 211.02°, 141.63°, -3.74°.

[0018] The rake angles α of the first cutting tooth to the fourteenth cutting tooth are successively 19.18°, 19.11°, 21.52°, 24.4°, 20.75°, 16.89°, 15.44°, 19.15°, 24.47°, 16.03°, 23.96°, 19.07°, 19.59°, 16.03°.

[0019] The side turning angles β of the first cutting tooth to the fourteenth cutting tooth are successively 9.75°, 2.84°, 18.34°, 5.19°, 15.93°, 7°, 5.02°, 17.9°, 10.57°, 13.91°, 5.47°, 14.01°, 19.24°, 16.95°.

[0020] The beneficial effect of the present utility model lies in that: the circumferential angles θ c , rake angles α and side turning angles β of all the cutting teeth are not the same, making the lateral force and bending moment received by the drill bit during drilling more balanced, helping to reduce vibration or sticking of the drill, improving its drilling effect, and reducing the damage rate and loss cost of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 Schematic diagram of the rake angle α of the cutting teeth of the present utility model;

[0023] Figure 3 Schematic diagram of the side rotation angle β and the normal angle γ of the cutting teeth of the present utility model;

[0024] Figure 4 Coordinate diagram of the cutting teeth of the present utility model, where Rc is the distance from the center point of the cutting tooth to the central axis of the drill bit body in the radial direction of the drill bit body, and Hc is the distance from the center point of the cutting tooth to the origin in the axial direction of the drill bit body;

[0025] Figure 5 Comparison diagram of the lateral forces of the drill bits before and after optimization;

[0026] Figure 6 Comparison diagram of the bending moments of the drill bits before and after optimization.

[0027] In the figure: 1 - first blade, 2 - second blade, 3 - third blade, 4 - fourth blade, 5 - fifth blade, 6 - first cutting tooth, 7 - second cutting tooth, 8 - third cutting tooth, 9 - fourth cutting tooth, 10 - fifth cutting tooth, 11 - sixth cutting tooth, 12 - seventh cutting tooth, 13 - eighth cutting tooth, 14 - ninth cutting tooth, 15 - tenth cutting tooth, 16 - eleventh cutting tooth, 17 - twelfth cutting tooth, 18 - thirteenth cutting tooth, 19 - fourteenth cutting tooth, 20 - water hole, 21 - drill bit body. Specific implementation mode

[0028] The technical solution of the present utility model will be further described below, but the scope of protection claimed is not limited thereto.

[0029] As Figures 1 to 6 shown, a drill bit for drilling of the present utility model includes a drill bit body 21, five blades are provided on the drill bit body 21, a plurality of cutting teeth are provided on each of the five blades, and the circumferential angles θ c , rake angles α and side rotation angles β of all the cutting teeth are all different. The circumferential angles θ c , rake angles α and side rotation angles β of all the cutting teeth are all different, so that the lateral forces and bending moments received by the drill bit during drilling are more balanced, which helps to reduce vibration or sticking of the drill, improve its drilling effect, and reduce the damage rate and loss cost of the drill bit.

[0030] Water holes 20 are provided between adjacent two blades on the drill bit body 21.

[0031] The diameter of the drill bit body 21 is 94 mm.

[0032] All the cutting teeth are diamond composite inserts, and the diameter of the diamond composite insert is 13 mm and the thickness is 2 mm.

[0033] The included angle between two adjacent ones of the five cutter wings is 72°.

[0034] The five cutter wings include a first cutter wing 1, a second cutter wing 2, a third cutter wing 3, a fourth cutter wing 4 and a fifth cutter wing 5.

[0035] A first cutting tooth 6 and a second cutting tooth 7 are successively arranged on the first cutter wing 1, and the second cutting tooth 7 is arranged closer to the central axis of the drill bit body 21 than the first cutting tooth 6.

[0036] A third cutting tooth 8, a fourth cutting tooth 9 and a fifth cutting tooth 10 are successively arranged on the second cutter wing 2, and the fifth cutting tooth 10 is arranged closer to the central axis of the drill bit body 21 than the fourth cutting tooth 9.

[0037] A sixth cutting tooth 11, a seventh cutting tooth 12 and an eighth cutting tooth 13 are successively arranged on the third cutter wing 3, and the eighth cutting tooth 13 is arranged closer to the central axis of the drill bit body 21 than the seventh cutting tooth 12.

[0038] A ninth cutting tooth 14 and a tenth cutting tooth 15 are successively arranged on the fourth cutter wing 4, and the tenth cutting tooth 15 is arranged closer to the central axis of the drill bit body 21 than the ninth cutting tooth 14.

[0039] An eleventh cutting tooth 16, a twelfth cutting tooth 17, a thirteenth cutting tooth 18 and a fourteenth cutting tooth 19 are successively arranged on the fifth cutter wing 5, and the fourteenth cutting tooth 19 is arranged closer to the central axis of the drill bit body 21 than the thirteenth cutting tooth 18.

[0040] The circumferential angles of the first cutting tooth 6 to the fourteenth cutting tooth 19 are -3.92°, 142.67°, 212.7°, 284.65°, -1.29°, 70.18°, 212.17°, 140.51°, -0.97°, 286.15°, 67.38°, 211.02°, 141.63°, -3.74° in sequence.

[0041] The rake angles α of the first cutting tooth 6 to the fourteenth cutting tooth 19 are 19.18°, 19.11°, 21.52°, 24.4°, 20.75°, 16.89°, 15.44°, 19.15°, 24.47°, 16.03°, 23.96°, 19.07°, 19.59°, 16.03° in sequence.

[0042] The side rotation angles β of the first cutting tooth 6 to the fourteenth cutting tooth 19 are successively 9.75°, 2.84°, 18.34°, 5.19°, 15.93°, 7°, 5.02°, 17.9°, 10.57°, 13.91°, 5.47°, 14.01°, 19.24°, 16.95°.

[0043] Specifically, the original tooth arrangement parameters of the commonly used five-wing and fourteen-tooth diamond bit are shown in Table 1:

[0044] Table 1 Original Tooth Arrangement Parameters of the Bit

[0045]

[0046] The tooth arrangement parameters of the bit before and after optimization are shown in Table 2:

[0047] Table 2 Comparison Table of Bit Tooth Arrangement Parameters Before and After Optimization

[0048]

[0049] As Figure 5 and Figure 6 shown, compared with the commonly used five-wing and fourteen-tooth diamond bit, after optimizing the circumferential angle θ c of the fourteen cutting teeth, under the same drilling pressure, the dispersion degree of the lateral force received by the optimized bit is significantly reduced, and the average value of the lateral force decreases by 1.81 kN; at the same time, the dispersion degree of the bending moment received by the optimized bit is reduced, and the average value of the bending moment decreases by 0.163 kN·m. Thus, it can be seen that after optimizing the circumferential angle θ c of the cutting teeth, the lateral force and bending moment received by the bit during drilling are more balanced.

[0050] Compared with the commonly used five-wing and fourteen-tooth diamond bit, after optimizing the rake angle α of the fourteen cutting teeth, the cutting efficiency of the cutting teeth during drilling can be improved, the cutting resistance can be reduced, and thus the drilling speed of the bit can be increased. As Figure 5 shown, the lateral force of the optimized bit is significantly reduced, and the work required to overcome the lateral force is also correspondingly reduced, which reflects from the side that the cutting resistance of the optimized bit is reduced.

[0051] Compared with the commonly used five-wing and fourteen-tooth diamond bit, after optimizing the side rotation angle β of the fourteen cutting teeth, the chip discharge effect can be improved, the blockage and wear of the bit during drilling can be reduced, and the stability and durability of the bit can be improved.

[0052] In summary, for the circumferential angle θ of the bit cutting teeth cAfter optimizing the rake angle α and the side rotation angle β, the overall drill bit reaches the optimal parameter state, thereby improving the drilling efficiency, stability and durability of the drill bit, enabling it to meet the drilling requirements under various complex formation conditions, and reducing the drill bit damage rate and wear cost.

Claims

1. A drill bit for drilling, characterized in that: The drill bit comprises a drill body (21), wherein the drill body (21) is provided with five blades, each of the five blades is provided with a plurality of cutting teeth, and the circumferential angle θ of all the cutting teeth is c , the forward inclination angle α and the side turning angle β are all different.

2. The drill bit for drilling according to claim 1, characterized in that: The drill bit body (21) is provided with a water hole (20) between two adjacent blades.

3. The drill bit for drilling according to claim 1, characterized in that: The diameter of the drill bit body (21) is 94 mm.

4. The drill bit for drilling according to claim 1, characterized in that: All the cutting teeth are diamond composite sheets, and the diameter of the diamond composite sheet is 13 mm and the thickness is 2 mm.

5. The drill bit for drilling according to claim 1, characterized in that: The angle between two adjacent blade wings among the five blade wings is 72°.

6. The drill bit for drilling according to claim 1, characterized in that: The five blade wings include a first blade wing (1), a second blade wing (2), a third blade wing (3), a fourth blade wing (4) and a fifth blade wing (5).

7. The drill bit for drilling according to claim 6, characterized in that: The first blade wing (1) is provided with a first cutting tooth (6) and a second cutting tooth (7) in sequence, and the second cutting tooth (7) is arranged relative to the first cutting tooth (6) and close to the central axis of the drill body (21); The second blade wing (2) is provided with a third cutting tooth (8), a fourth cutting tooth (9) and a fifth cutting tooth (10) in sequence, and the fifth cutting tooth (10) is arranged relative to the fourth cutting tooth (9) and close to the central axis of the drill body (21); The third blade wing (3) is provided with a sixth cutting tooth (11), a seventh cutting tooth (12) and an eighth cutting tooth (13) in sequence, and the eighth cutting tooth (13) is arranged relative to the seventh cutting tooth (12) and close to the central axis of the drill body (21); The fourth blade (4) is provided with a ninth cutting tooth (14) and a tenth cutting tooth (15) in sequence, and the tenth cutting tooth (15) is arranged relative to the ninth cutting tooth (14) and close to the central axis of the drill body (21); The fifth blade (5) is provided with an eleventh cutting tooth (16), a twelfth cutting tooth (17), a thirteenth cutting tooth (18) and a fourteenth cutting tooth (19) in sequence, and the fourteenth cutting tooth (19) is arranged relative to the thirteenth cutting tooth (18) and close to the central axis of the drill body (21).

8. The drill bit for drilling according to claim 7, characterized in that: The circumferential angle θ of the first cutting tooth (6) to the fourteenth cutting tooth (19) is c They are -3.92°, 142.67°, 212.7°, 284.65°, -1.29°, 70.18°, 212.17°, 140.51°, -0.97°, 286.15°, 67.38°, 211.02°, 141.63°, and -3.74° respectively.

9. The drill bit for drilling according to claim 7, characterized in that: The front inclination angles α of the first cutting tooth (6) to the fourteenth cutting tooth (19) are 19.18°, 19.11°, 21.52°, 24.4°, 20.75°, 16.89°, 15.44°, 19.15°, 24.47°, 16.03°, 23.96°, 19.07°, 19.59°, and 16.03°, respectively.

10. The drill bit for drilling according to claim 7, characterized in that: The side turning angles β of the first cutting tooth (6) to the fourteenth cutting tooth (19) are 9.75°, 2.84°, 18.34°, 5.19°, 15.93°, 7°, 5.02°, 17.9°, 10.57°, 13.91°, 5.47°, 14.01°, 19.24°, and 16.95°, respectively.

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