CN210217630U

CN210217630U - PDC drill bit suitable for hard formation creeps into fast

Info

Publication number: CN210217630U
Application number: CN201921028410.1U
Authority: CN
Inventors: Zhongfeng Yang; 杨忠锋; Junyong Chen; 陈俊勇
Original assignee: SHEENSTONE (SHENZHEN) OIL TOOLS CO Ltd; Intercontinental Strait Energy Technology Co Ltd
Current assignee: SHEENSTONE (SHENZHEN) OIL TOOLS CO Ltd; Intercontinental Strait Energy Technology Co Ltd
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-03-31
Anticipated expiration: 2029-07-02

Abstract

The utility model discloses a PDC drill bit suitable for fast drilling in hard stratum, a plurality of blades are arranged on a drill bit body, each blade comprises an inner cone part, an outer shoulder part and a cutting part, and one end of the inner cone part extends to the top end surface of the drill bit body; the top end surface of the inner conical part and the top end surface of the drill bit body form an included angle; the other end of the inner cone part is connected with the outer shoulder part; one end of the outer shoulder is connected with the inner conical part and distributed on the shoulder of the drill bit body; the other end of the outer shoulder part extends to the side part of the drill bit body and is connected with the diameter cutting part; the cutting parts are distributed on the side part of the drill bit body and extend along the height direction of the drill bit body; the included angle formed by the top end surface of the inner cone part and the top end surface of the drill bit body is larger than or equal to 140 degrees, and the outer shoulder part is connected between the inner cone part and the diameter cutting part through an arc surface; the arc angle of the arc surface is larger than 180 degrees; a plurality of cutting teeth are distributed on the blade. The utility model can improve the stability and shock resistance of the drill bit drilling; and wear can be reduced.

Description

PDC drill bit suitable for hard formation creeps into fast

Technical Field

The utility model relates to a drill bit technical field especially relates to a PDC drill bit suitable for hard stratum creeps into fast.

Background

At present, in oil drilling, a drill bit is generally adopted for drilling, when the stratum is hard and the wear resistance is strong, blades on the drill bit are not easy to bite, the impact on the blades is strong, the advancing process of the drill bit is unstable, and the drill bit is easy to wear.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a PDC drill bit which is suitable for fast drilling in hard stratum, and can improve the drilling stability and the shock resistance of the drill bit; and wear can be reduced.

The purpose of the utility model is realized by adopting the following technical scheme:

a PDC drill bit suitable for fast drilling in a hard stratum is characterized in that a drill bit body is provided with a plurality of blades which are distributed at intervals around the circumference of the central axis of the drill bit body; the blade comprises an inner cone part, an outer shoulder part and a diameter cutting part, wherein one end of the inner cone part extends to the top end surface of the drill bit body; the top end surface of the inner conical part and the top end surface of the drill bit body form an included angle; the other end of the inner cone part is connected with the outer shoulder part; one end of the outer shoulder is connected with the inner conical part and distributed on the shoulder of the drill bit body; the other end of the outer shoulder part extends to the side part of the drill bit body and is connected with the diameter cutting part; the cutting parts are distributed on the side part of the drill bit body and extend along the height direction of the drill bit body; the included angle formed by the top end surface of the inner conical part and the top end surface of the drill bit body is larger than or equal to 140 degrees, and the outer shoulder part is connected between the inner conical part and the diameter cutting part through an arc surface; the arc angle of the arc surface is larger than 180 degrees; a plurality of cutting teeth are distributed on the blade.

Preferably, the blades are spirally distributed on the drill bit body.

Preferably, six blades are arranged; the distribution angles of the six blades in the circumferential direction of the drill body are respectively 0 °, 49 °, 120 °, 166 °, 237 ° and 288 °.

Preferably, the cutting teeth No. 1, No. 4, No. 7, No. 13, No. 19, No. 25 and No. 31 are distributed on the surface of the blade with the distribution angle of 0 degree from the top end downwards in sequence; 12, 18, 24 and 30 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 49 degrees from the top end downwards; no. 3, No. 6, No. 11, No. 17, No. 23 and No. 29 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 120 degrees from the top end downwards; 10, 16, 22, 28 and 34 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 166 degrees from the top end downwards; no. 2, No. 5, No. 9, No. 15, No. 21, No. 27 and No. 33 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 237 degrees from the top end downwards; no. 8, No. 14 and No. 20 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 288 degrees from the top end to the bottom.

Preferably, the No. 7, No. 9, No. 10, No. 11, No. 12, No. 13, No. 15, No. 16, No. 17, No. 18, No. 19, No. 21, No. 22, No. 23, No. 24 cutting teeth are axe-type teeth; the cutting teeth No. 1, No. 3, No. 4, No. 6, No. 9, No. 15, No. 21, No. 25, No. 26, No. 28, No. 29, No. 30, No. 31, No. 32 and No. 34 are circular teeth.

Compared with the prior art, the beneficial effects of the utility model reside in that:

(1) the inner cone angle formed by the inner cone part of the blade on the drill bit body and the drill bit body is 140 degrees, the deep inner cone design increases the drilling stability of the drill bit, simultaneously improves the coverage rate of the blade in the central area of the drill bit, and reduces the occurrence of the core grinding phenomenon of the drill bit after use.

(2) The outer shoulder part of the blade on the drill bit body adopts a large arc surface design, so that good impact resistance can be obtained, and the drill bit is suitable for being used in a hard stratum with strong abrasiveness.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of another view structure of the present invention.

In the figure: 10. a drill bit body; 20. a blade; 21. an internal taper; 22. an outer shoulder; 23. a diameter cutting part; 30. an axe-shaped tooth; 40. and (4) round teeth.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 and 2, a PDC drill bit suitable for rapid drilling in a hard formation includes a bit body 10, a plurality of blades 20 are disposed on the bit body 10, the plurality of blades 20 are circumferentially distributed around a central axis of the bit body 10 at intervals, each blade 20 includes an inner cone portion 21, an outer shoulder portion 22 and a cutting portion 23, and one end of the inner cone portion 21 extends to a top end face of the bit body 10; the top end surface of the internal cone part 21 and the top end surface of the drill bit body 10 form an included angle; the other end of the internal cone part 21 is connected with the external shoulder part 22; one end of the external shoulder 22 is connected with the internal cone 21 and distributed on the shoulder of the drill bit body 10; the other end of the outer shoulder 22 extends to the side of the bit body 10 and engages with the cut-off portion 23; the cut-off portions 23 extend in the height direction of the bit body 10, distributed on the side of the bit body 10.

Specifically, the included angle formed by the top end surface of the internal taper portion 21 and the top end surface of the bit body 10 is greater than or equal to 140 °, and the external shoulder portion 22 is connected between the internal taper portion 21 and the cut-off portion 23 by an arc surface, and the arc angle of the arc surface is greater than 180 °; a plurality of cutting teeth are distributed on the blade 20.

On the basis of the structure, use the utility model discloses a when being applicable to the PDC drill bit that hard stratum creeps into fast, a plurality of cutting teeth can be at the broken rock of drilling in-process on a plurality of blades 20 on its drill bit body 10. Because the inner taper angle formed by the inner taper part 21 of the upper blade 20 of the bit body 10 and the bit body 10 is 140 degrees, the deep inner taper design increases the drilling stability of the bit, improves the coverage rate of the blade 20 in the central area of the bit, and reduces the occurrence of the core grinding phenomenon after the bit is used. In addition, the outer shoulder 22 of the blade 20 on the bit body 10 is designed to be a large arc surface, so that the bit body can obtain good impact resistance and is suitable for being used in a hard and strong-abrasiveness stratum.

Preferably, the blades 20 are spirally distributed on the drill body 10, so that the aggressivity is relatively strong, and the spiral structure can disperse the centrifugal force during the rotation of the drill body 10, so that the rotation is relatively stable.

Preferably, six blades 20 are provided; the distribution angles of the six blades 20 in the circumferential direction of the drill bit body 10 are respectively 0 degrees, 49 degrees, 120 degrees, 166 degrees, 237 degrees and 288 degrees, and the blades 20 are distributed in such a way that the stress is more stable in the drilling process of the drill bit.

Furthermore, the cutting teeth No. 1, No. 4, No. 7, No. 13, No. 19, No. 25 and No. 31 are distributed on the surface of the blade 20 with the distribution angle of 0 degree from the top end to the bottom in sequence; 12, 18, 24 and 30 cutting teeth are sequentially distributed on the surface of the blade 20 with the distribution angle of 49 degrees from the top end downwards; the cutting teeth No. 3, No. 6, No. 11, No. 17, No. 23 and No. 29 are sequentially distributed on the surface of the blade 20 with the distribution angle of 120 degrees from the top end downwards; 10, 16, 22, 28 and 34 cutting teeth are sequentially distributed on the surface of the blade 20 with the distribution angle of 166 degrees from the top end downwards; the cutting teeth No. 2, No. 5, No. 9, No. 15, No. 21, No. 27 and No. 33 are distributed on the surface of the blade 20 with the distribution angle of 237 degrees from the top end to the bottom in sequence; the surface of the blade 20 with the distribution angle of 288 degrees is distributed with No. 8, No. 14 and No. 20 cutting teeth from the top to the bottom in sequence. The arrangement mode of the cutting teeth is better and reasonable, the bearing capacity of each blade 20 is relatively balanced, and the drill bit is more stable and efficient during drilling.

Referring specifically to fig. 2, the No. 7, No. 9, No. 10, No. 11, No. 12, No. 13, No. 15, No. 16, No. 17, No. 18, No. 19, No. 21, No. 22, No. 23, No. 24 cutting teeth are axe-shaped teeth 30; the cutting teeth No. 1, No. 3, No. 4, No. 6, No. 9, No. 15, No. 21, No. 25, No. 26, No. 28, No. 29, No. 30, No. 31, No. 32, No. 34 are round teeth 40.

On the basis of the tooth distribution structure, the drill bit adopts clockwise tooth distribution, the hatchet-shaped teeth 30 and the round teeth 40 are mixed to distribute teeth, the hatchet-shaped teeth 30 are arranged at the outer shoulder portions 22 of the blades 20, the round teeth 40 are arranged at the inner cone portions 21 and the cutting diameter portions 23 of the blades 20, the hatchet-shaped cutting teeth combine two modes of cutting rock breaking and extruding rock breaking, the rock breaking efficiency is improved, the hatchet-shaped teeth 30 increase the thickness of the blades 20, the durability of the drill bit cutting teeth is improved, and the mechanical drilling speed can be always kept within a design range in the drilling process. In addition, the hatchet-type tooth 30 requires a lower chip force, reduces torque, attenuates reactive torque ripple, and improves tool face control capability.

It should be noted that the present embodiment refers to the ax-shaped tooth 30 as a cutting tooth having the same structure as the axe in the prior art, i.e., the cutting tooth has two cutting surfaces arranged at an included angle. While the scallops 40 are referred to as conventional cylindrical cutting teeth in the prior art, having rounded cutting faces.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. A PDC drill bit suitable for fast drilling in a hard stratum comprises a drill bit body, wherein a plurality of blades are arranged on the drill bit body and are circumferentially distributed around the central axis of the drill bit body at intervals; the blade comprises an inner cone part, an outer shoulder part and a diameter cutting part, wherein one end of the inner cone part extends to the top end surface of the drill bit body; the top end surface of the inner conical part and the top end surface of the drill bit body form an included angle; the other end of the inner cone part is connected with the outer shoulder part; one end of the outer shoulder is connected with the inner conical part and distributed on the shoulder of the drill bit body; the other end of the outer shoulder part extends to the side part of the drill bit body and is connected with the diameter cutting part; the cutting parts are distributed on the side part of the drill bit body and extend along the height direction of the drill bit body; the angle formed by the top end surface of the inner cone part and the top end surface of the drill bit body is larger than or equal to 140 degrees, and the outer shoulder part is connected between the inner cone part and the diameter cutting part through an arc surface; the arc angle of the arc surface is larger than 180 degrees; a plurality of cutting teeth are distributed on the blade.

2. The PDC bit adapted for rapid drilling of hard formations according to claim 1 wherein the blades are helically distributed on the bit body.

3. The PDC bit adapted for rapid drilling of hard formations according to claim 1 wherein there are six blades; the distribution angles of the six blades in the circumferential direction of the drill body are respectively 0 degrees, 49 degrees, 120 degrees, 166 degrees, 237 degrees and 288 degrees.

4. The PDC drill bit suitable for rapid drilling in hard formations according to claim 3, wherein the blade surface with the distribution angle of 0 degrees is provided with No. 1, No. 4, No. 7, No. 13, No. 19, No. 25 and No. 31 cutting teeth in sequence from the top end downwards; 12, 18, 24 and 30 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 49 degrees from the top end downwards; no. 3, No. 6, No. 11, No. 17, No. 23 and No. 29 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 120 degrees from the top end downwards; 10, 16, 22, 28 and 34 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 166 degrees from the top end downwards; no. 2, No. 5, No. 9, No. 15, No. 21, No. 27 and No. 33 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 237 degrees from the top end downwards; no. 8, No. 14 and No. 20 cutting teeth are sequentially distributed on the surface of the blade with the distribution angle of 288 degrees from the top end to the bottom.

5. The PDC bit suitable for rapid drilling of hard formations of claim 4 wherein the 7, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 21, 22, 23, 24 cutting teeth are axe-type teeth; the cutting teeth No. 1, No. 3, No. 4, No. 6, No. 9, No. 15, No. 21, No. 25, No. 26, No. 28, No. 29, No. 30, No. 31, No. 32 and No. 34 are circular teeth.