Reinforced gauge protection type PDC (Polycrystalline Diamond Compact) drill bit

Abstract

The invention relates to the technical field of petroleum and geological drill bits, in particular to a reinforced gauge protection type polycrystalline diamond compact (PDC) drill bit which is used for solving the problems that other parts are intact and the overall service life is affected when gauge protection parts and near gauge protection parts of a drill bit are damaged. The drill bit body comprises a gauge protection part; three-edged teeth are arranged on the gauge protection assembly; the three-edged tooth has a caster angle and a roll angle; when the drill bit body rotates, the triangular teeth decompose front impact force through the caster angle and the roll angle. When the drill bit body rotates, the gauge protection assembly is located at the highest-linear-speed position of the drill bit, the instantaneous speed of the position making contact with rock is the fastest, the abrasion resistance and impact resistance of the PDC teeth at the gauge protection assembly can be improved through the triangular teeth arranged at the gauge protection assembly, and the impact force of drilling of the drill bit body can be dispersed through the caster angle and the roll angle of the triangular teeth; therefore, the overall service life of the PDC drill bit is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and geological drill bits, and particularly to a reinforced gauge-protecting PDC drill bit. Background Art

[0002] The head shape part of a PDC drill bit is divided into an inner cone, a nose, a shoulder, a near-gauge, an entrance-gauge and a gauge part. The linear velocities of each part in rotary drilling when contacting the rock vary greatly, resulting in inconsistent impact destructive forces on the composite buttons. The linear velocities of the entrance-gauge and the near-gauge are the largest, and the impact damage is the greatest. The PDC teeth in this part are easily damaged. Especially in order to improve the oil extraction efficiency, more drilling companies propose to drill with enhanced drilling parameters.

[0003] When using a high-speed screw in cooperation with the drill bit, the linear velocities of the entrance-gauge, the near-gauge and the gauge part are further increased, resulting in damage to the PDC in this part. Especially in the directional well section and the horizontal well section of a horizontal well, due to the inclined or horizontal drilling of the drill bit, affected by gravity, the near-gauge and the entrance-gauge parts will be subjected to greater forces than other parts. During high-speed cutting, it is easy to cause damage to this part. Due to the above problems, when the entrance-gauge and the near-gauge parts of the drill bit are damaged, other parts are intact, and the service lives of the PDC teeth in each part are inconsistent, affecting the overall service life. Summary of the Invention

[0004] The present invention provides a reinforced gauge-protecting PDC drill bit to solve the problem that when the entrance-gauge and the near-gauge parts of the drill bit are damaged, other parts are intact, affecting the overall service life.

[0005] In order to alleviate the above technical problems, the technical solution provided by the present invention lies in:

[0006] A reinforced gauge-protecting PDC drill bit includes a drill bit body and a sub. The drill bit body includes a gauge protection assembly. Three-edge teeth are arranged on the gauge protection assembly. The three-edge teeth have a back rake angle and a side rake angle. When the drill bit body rotates, the three-edge teeth decompose the frontal impact force through the back rake angle and the side rake angle.

[0007] Furthermore, the gauge protection assembly includes an entrance-gauge and a near-gauge. The number of the three-edge teeth is two, and the two three-edge teeth are respectively connected to the entrance-gauge and the near-gauge.

[0008] Furthermore, the back rake angle of the three-edge teeth is between 20° and 30°, and the side rake angle is between 5° and 10°.

[0009] Furthermore, the drill bit body includes cutter wings and a gauge body, and the cutter wings and the gauge body are integrally formed and connected to the drill bit body.

[0010] Furthermore, arc teeth and gauge teeth are respectively connected to the cutter wings and the gauge body.

[0011] Furthermore, the arc-shaped teeth are made of high-abrasion-resistant PDC teeth.

[0012] Furthermore, there are multiple gauge diameter teeth and arc-shaped teeth, and the multiple gauge diameter teeth and arc-shaped teeth fully cover the gauge diameter body and the blade.

[0013] Furthermore, the arc-shaped teeth are connected to the blade by brazing.

[0014] Furthermore, the gauge diameter teeth are connected to the gauge diameter body by brazing.

[0015] The beneficial effects of the present invention are analyzed as follows:

[0016] A reinforced gauge-protecting PDC bit, comprising a bit body and a sub, is characterized in that;

[0017] The bit body includes a gauge protection;

[0018] Three-edge teeth are arranged on the gauge protection;

[0019] The three-edge teeth have a back rake angle and a side rake angle;

[0020] When the bit body rotates, the three-edge teeth decompose the frontal impact force through the back rake angle and the side rake angle.

[0021] When the bit body rotates, the gauge protection assembly is at the part with the highest linear velocity of the bit. The instantaneous velocity of contact with the rock here is the fastest. The three-edge teeth arranged at the gauge protection assembly can improve the abrasion resistance and impact resistance of the PDC teeth at the gauge protection assembly part, and the back rake angle and side rake angle of the three-edge teeth can disperse the impact force during the drilling of the bit body, thereby improving the overall service life of the PDC bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the stress state during drilling of the present invention;

[0025] Figure 3 It is a schematic diagram of the PDC tooth linear velocity during rotary drilling of the present invention.

[0026] Reference Signs:

[0027] 100, Bit body; 110, Sub; 200, Gauge protection assembly; 210, Triangular teeth; 220, In-gauge protection; 230, Near-gauge protection; 300, Blade; 310, Gauge body; 311, Arc teeth; 312, Gauge teeth. Specific embodiments

[0028] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific situations.

[0031] Embodiment

[0032] As Figures 1 - 3 shown, a reinforced gauge protection type PDC bit includes a bit body 100 and a sub 110; the bit body 100 includes a gauge protection assembly 200; triangular teeth 210 are provided on the gauge protection assembly 200; the triangular teeth 210 have a back rake angle and a side rake angle; when the bit body 100 rotates, the triangular teeth 210 decompose the frontal impact force through the back rake angle and the side rake angle.

[0033] When the drill bit body 100 rotates, the gauge protection assembly 200 is at the part with the highest linear velocity of the drill bit. The instantaneous velocity of contact with the rock here is the fastest. The three-sided teeth 210 provided at the gauge protection part can improve the abrasion resistance and impact resistance of the PDC teeth at the gauge protection part. Moreover, the back rake angle and side rake angle set for the three-sided teeth 210 can disperse the impact force during the drilling of the drill bit body 100, thereby improving the overall service life of the PDC drill bit.

[0034] Regarding the structure of the gauge protection assembly 200, specifically:

[0035] The gauge protection assembly 200 includes an inlet gauge protection 220 and a near gauge protection 230. The number of the three-sided teeth 210 is two, and the two three-sided teeth 210 are respectively connected to the inlet gauge protection 220 and the near gauge protection 230.

[0036] The two three-sided teeth 210 are respectively connected to the inlet gauge protection 220 and the near gauge protection 230 to balance the impact resistance performance of each PDC tooth on the drill bit body 100. The setting of the two three-sided teeth 210 enables the inlet gauge protection 220 and the near gauge protection 230 to obtain abrasion resistance and disperse the impact force.

[0037] In an alternative embodiment of the present embodiment, preferably:

[0038] The back rake angle of the three-sided teeth 210 is between 20° and 30°, and the side rake angle is between 5° and 10°.

[0039] Experiments have confirmed that when the back rake angle of the three-sided teeth 210 is between 20° and 30° and the side rake angle is between 5° and 10°, the gauge protection assembly 200 can disperse the most impact force.

[0040] Regarding the cutter wing 300 and the gauge diameter body 310, specifically:

[0041] The drill bit body 100 includes a cutter wing 300 and a gauge diameter body 310. The cutter wing 300 and the gauge diameter body 310 are integrally formed and connected to the drill bit body 100.

[0042] The integral connection of the cutter wing 300 and the gauge diameter body 310 to the drill bit body 100 enables the drill bit body 100 to have sufficient mechanical strength.

[0043] In an alternative embodiment of the present embodiment, preferably:

[0044] An arc tooth 311 and a gauge diameter tooth 312 are respectively connected to the cutter wing 300 and the gauge diameter body 310.

[0045] The setting of the arc tooth 311 enables the cutter wing 300 to effectively perform the cutting operation. The setting of the gauge diameter tooth 312 ensures the stability and orientation of the drill bit body 100, prevents the drill bit from deflecting during drilling, and ensures the accuracy of drilling.

[0046] In an alternative embodiment of the present invention, a more preferred option is as follows:

[0047] The arc-shaped teeth 311 are made of high-abrasion-resistant PDC teeth.

[0048] Using high-abrasion-resistant PDC teeth as the material for the arc-shaped teeth 311 can improve the wear resistance of the drill bit, extend its service life, increase the drilling efficiency, and reduce the maintenance cost and replacement cost.

[0049] In an alternative embodiment of the present invention, a more preferred option is as follows:

[0050] There are multiple gauge teeth 312 and arc-shaped teeth 311, and the multiple gauge teeth 312 and arc-shaped teeth 311 completely cover the gauge body 310 and the blade 300.

[0051] The multiple gauge teeth 312 and arc-shaped teeth 311 can increase the contact area between the drill bit body 100 and the rock or other materials, thereby increasing the cutting force and friction force, improving the drilling efficiency. The combined action of multiple teeth can disperse the pressure on the drill bit body 100 and reduce the load on a single tooth, thus extending the service life of the drill bit.

[0052] In an alternative embodiment of the present invention, a more preferred option is as follows:

[0053] The arc-shaped teeth 311 are connected to the blade 300 by brazing; the gauge teeth 312 are connected to the gauge body 310 by brazing.

[0054] The components connected by brazing form an integral structure with high strength and stability, capable of withstanding large forces and stresses, ensuring the stability of the blade and the gauge during use. The components connected by brazing have good wear resistance. Due to the metallurgical bonding between the filler metal and the components, they can resist wear and corrosion. The components connected by brazing can withstand high temperatures and are suitable for working in high-temperature environments.

[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reinforced gauge-keeping PDC bit, comprising a bit body (100) and a sub (110), characterized in that ； The drill bit body (100) includes a gauge protection assembly (200); The gauge protection assembly (200) is provided with three-edge teeth (210); The three-edge teeth (210) have a back rake angle and a side rake angle; When the drill bit body (100) rotates, the three-edge teeth (210) decompose the frontal impact force through the back rake angle and the side rake angle.

2. The enhanced gauge protection type PDC drill bit according to claim 1, characterized in that; The gauge protection assembly (200) includes an inlet gauge protection (220) and a near gauge protection (230), the number of the three-edge teeth (210) is two, and the two three-edge teeth (210) are respectively connected to the inlet gauge protection (220) and the near gauge protection (230).

3. The enhanced gauge-holding PDC bit according to claim 2, Characterized in that; The back rake angle of the three-edge teeth (210) is between 20° and 30°, and the side rake angle is between 5° and 10°.

4. The enhanced gauge-holding PDC bit according to claim 3, wherein ； The drill bit body (100) includes cutter wings (300) and a gauge diameter body (310), and the cutter wings (300) and the gauge diameter body (310) are integrally formed and connected to the drill bit body (100).

5. The enhanced gauge-holding PDC bit according to claim 4, wherein ； Arc-shaped teeth (311) and gauge diameter teeth (312) are respectively connected to the cutter wings (300) and the gauge diameter body (310).

6. The enhanced gauge-preserving PDC bit according to claim 5, wherein ； The arc-shaped teeth (311) are made of high-abrasion-resistant PDC teeth.

7. The enhanced gauge protection type PDC drill bit according to claim 6, characterized in that; There are multiple gauge diameter teeth (312) and arc-shaped teeth (311), and the multiple gauge diameter teeth (312) and arc-shaped teeth (311) fully cover the gauge diameter body (310) and the cutter wings (300).

8. The enhanced gauge-holding PDC bit according to claim 5, wherein ； The arc-shaped teeth (311) are connected to the cutter wings (300) by brazing.

9. The enhanced gauge protection type PDC drill bit according to claim 5, characterized in that; The gauge diameter teeth (312) are connected to the gauge diameter body (310) by brazing.

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