CN210659949U

CN210659949U - PDC drill bit is advanced to high efficiency of containing gravel complicated stratum

Info

Publication number: CN210659949U
Application number: CN201921030970.0U
Authority: CN
Inventors: 陈俊勇; 温贵凡; 胡家建; 刘传香
Original assignee: Sheenstone Shenzhen Oil Tools Co ltd
Current assignee: Sheenstone Shenzhen Oil Tools Co ltd
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-06-02
Anticipated expiration: 2029-07-02

Abstract

The utility model discloses a PDC drill bit for efficiently drilling gravel-containing complex stratum, which comprises a drill bit body, wherein a plurality of blades are distributed on the drill bit body and are distributed at intervals around the circumference of the central axis of the drill bit body; the blades extend downwards from the top end surface of the drill bit body to the side surface of the drill bit body and are distributed spirally; a plurality of first cutting teeth and a plurality of second cutting teeth are arranged on the blade; the first cutting teeth and the second cutting teeth are sequentially distributed at intervals from the top end to the bottom in the extending direction of the blade; the first cutting teeth and the second cutting teeth are protruded out of the surface of the blade; the height of the first cutting tooth protruding out of the surface of the blade is higher than that of the second cutting tooth protruding out of the surface of the blade; the bottom end of the blade is provided with a gauge protection block; and a third cutting tooth is arranged on the gauge block. The utility model discloses can high-speed cutting compromise bore meet hard interbedded ability, improve broken rock efficiency.

Description

PDC drill bit is advanced to high efficiency of containing gravel complicated stratum

Technical Field

The utility model relates to a drill bit technical field especially relates to a to containing high-efficient PDC drill bit that drills in gravel complicated stratum.

Background

At present, in oil drilling, a drill bit is generally adopted for drilling, along with the development of drilling towards deeper and longer stratum, the drilling is more and more in the situation of meeting gravel-containing and plastic complex stratum, meanwhile, the density and the viscosity of drilling fluid are increased, the shearing force is increased, the pressure of a fluid-bearing column of the stratum is in a cemented compaction state, the situations of increasing during drilling, accelerating abrasion and the like occur.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model aims to provide a to containing the high-efficient PDC drill bit that drills into in gravel complicated stratum, but its high-speed cutting compromise bore meet the interbedded ability of hardness, improve broken rock efficiency.

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

a PDC drill bit for efficiently drilling gravel-containing complex strata comprises a drill bit body, wherein a plurality of blades are distributed on the drill bit body and are circumferentially distributed around the central axis of the drill bit body at intervals; the blades extend downwards from the top end surface of the drill bit body to the side surface of the drill bit body and are distributed spirally; a plurality of first cutting teeth and a plurality of second cutting teeth are arranged on the blade; the first cutting teeth and the second cutting teeth are sequentially distributed at intervals from the top end to the bottom in the extending direction of the blade; the first cutting teeth and the second cutting teeth are protruded out of the surface of the blade; the height of the first cutting tooth protruding out of the surface of the blade is higher than that of the second cutting tooth protruding out of the surface of the blade; the bottom end of the blade is provided with a gauge protection block; and a third cutting tooth is arranged on the gauge block.

Preferably, the cutting angle of the first cutting tooth is 12 ° to 15 °.

Preferably, the second cutting tooth is in the shape of a needle point.

Preferably, the blade includes a cutting tooth distribution surface and two side surfaces distributed on two sides of the cutting tooth distribution surface; the cutting teeth are distributed on the cloth surface and the side surfaces extend along the extending direction of the blade; the two side surfaces and the distribution surface of the cutting teeth form an included angle; the first cutting teeth and the second cutting teeth are distributed on the cutting tooth cloth distribution surface.

Preferably, the side surfaces of two adjacent blades are arranged at intervals and enclose a chip groove.

Preferably, a nozzle is arranged in the chip groove.

Preferably, a protruding part is arranged at the center of the top end of the drill bit body; the protruding part is made of wear-resistant materials.

Preferably, the plurality of blades comprise three first blades and two second blades, and the three first blades and the two second blades are circumferentially distributed at intervals around the central axis of the drill bit body; the two second blades are respectively distributed between the two first blades; the length of the first plurality of blades is greater than the length of the second plurality of blades.

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

1. a plurality of first cutting teeth and a plurality of second cutting teeth are sequentially distributed in the extending direction of each blade, the height of the first cutting teeth protruding out of the surface of each blade is higher than the height of the second cutting teeth protruding out of the surface of each blade, the first cutting teeth higher than the surface of each blade contact the stratum first, the confining pressure of the stratum is broken, the second cutting teeth lower than the surface of each blade perform tracking cutting, and the purpose of improving the rock breaking efficiency is achieved.

2. The stability of drill bit is strengthened to the design of screw-tupe wing, and the gauge block of wing bottom is equipped with the third cutting tooth, forms the secondary cutting to the easy undergauge well section of water-absorbing stratum, further improves broken rock efficiency.

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; 11. a chip groove; 12. a nozzle; 20. a blade; 21. a first cutting tooth; 22. a second cutting tooth; 23. a side surface; 24. the cutting teeth are distributed on the cloth surface.

Detailed Description

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

as shown in fig. 1 and 2, the PDC drill bit for efficiently drilling a gravel-containing complex formation includes a bit body 10, a plurality of blades 20 are distributed on the bit body 10, the plurality of blades 20 are circumferentially distributed around a central axis of the bit body 10 at intervals, and the blades 20 extend from a top surface of the bit body 10 downward to a side surface 23 of the bit body 10 and are spirally distributed. Specifically, the blade 20 is provided with a plurality of first cutting teeth 21 and a plurality of second cutting teeth 22; the plurality of first cutting teeth 21 and the plurality of second cutting teeth 22 are sequentially distributed at intervals from the top end downwards in the extending direction of the blade 20; the first cutting tooth 21 and the second cutting tooth 22 are protruded from the surface of the blade 20; the first cutting tooth 21 protrudes from the surface of the blade 20 to a higher level than the second cutting tooth 22 protrudes from the surface of the blade 20. Further, a gauge block is provided at the bottom end of the blade 20, and third cutting teeth are provided on the gauge block.

On the basis of the structure, use the utility model discloses a to containing the high-efficient PDC drill bit that creeps into in gravel complicated stratum, because it has a plurality of first cutting teeth 21 and a plurality of second cutting teeth 22 to distribute in proper order on the extending direction of its each wing 20, first cutting teeth 21 protrusion is higher than the height of second cutting teeth 22 protrusion in wing 20 surface in the height on wing 20 surface, when the rock formation is eaten to drill bit body 10, it is located the first cutting teeth 21 that exceeds wing 20 surface on drill bit body 10 top and can touch the stratum earlier, after the stratum confined pressure is abolished, drill bit body 10 gos deep into, the second cutting teeth 22 that is low on wing 20 surface this moment can trail the cutting, steadily advance, reach the purpose that improves broken rock efficiency. In addition, because the first cutting teeth 21 with higher convex parts are all distributed at the top end of the drill bit body 10, the cutting force can be concentrated to the position of the top point of the blade 20, and the single-point rock breaking capacity is improved.

Furthermore, it should be noted that, the blade 20 on the drill bit body 10 extends downward from the top end of the drill bit body 10 to the side surface 23 thereof to be spiral, during the rotation of the drill bit body 10, the spiral structure of the blade 20 can enhance the stability of the drill bit, and the gauge block at the bottom end of the blade 20 is provided with a third cutting tooth, so as to form a secondary cutting on the water-absorbent stratum hole section which is easy to reduce, thereby further improving the rock breaking efficiency.

Preferably, the cutting angle of the first cutting tooth 21 in this embodiment is 12 ° to 15 °, the cutting angle of the first cutting tooth 21 is relatively small, the cutting tooth is more easily penetrated into the formation, and the rate of penetration is effectively increased.

Preferably, the second cutting teeth 22 are needle-point shaped, and during the drilling process of the drill bit body 10, the needle-point shaped second cutting teeth 22 can apply axial impact force to the formation, so as to impact rock breaking and improve the drilling speed.

Preferably, the blade 20 includes a cutting tooth distribution surface 24 and two side surfaces 23, the two side surfaces 23 are distributed on two sides of the cutting tooth distribution surface 24, and the cutting tooth distribution surface 24 and the side surfaces 23 extend along the extending direction of the blade 20; the two side surfaces 23 and the cutting tooth distribution surface 24 are arranged at included angles, and the first cutting teeth 21 and the second cutting teeth 22 are distributed on the cutting tooth distribution surface 24. Therefore, the blade 20 comprises a plurality of surfaces, impact force from the stratum can be effectively decomposed, the impact resistance of the blade 20 is greatly improved, and the service life of the drill bit is prolonged.

Preferably, the side surfaces 23 of two adjacent blades 20 are spaced and surround the junk slots 11, so that when the drill bit body 10 drills into a rock stratum, rock debris can be removed along the junk slots 11, the rock debris around the blades 20 can be rapidly moved, and mud pockets are prevented from being generated.

Further, a nozzle 12 is arranged in the chip groove 11, and when the drill bit is used, the nozzle 12 can introduce water flow to wash rock debris in the chip groove 11 to help the rock debris to be discharged.

Preferably, a protrusion made of a wear-resistant material may be further provided at the center of the top end of the bit body 10, so that the protrusion of the bit body 10 may form a hard fulcrum, thereby increasing wear resistance.

Preferably, the plurality of blades 20 in the present embodiment includes three first blades and two second blades, the three first blades and the two second blades are circumferentially distributed around the central axis of the bit body 10 at intervals, the three first blades can form three intervals on the bit body 10, the two second blades are respectively distributed in two intervals formed by the two first blades, and the length of the plurality of first blades is greater than that of the plurality of second blades. Thus, during drilling operation, the first blade with the longer length can cut at high speed, and the second blade with the shorter length can also realize the capability of drilling hard interlayer.

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 for efficiently drilling gravel-containing complex strata comprises a drill bit body, wherein a plurality of blades are distributed on the drill bit body and are circumferentially distributed around the central axis of the drill bit body at intervals; the drill bit is characterized in that the blades extend downwards from the top end surface of the drill bit body to the side surface of the drill bit body and are distributed spirally; a plurality of first cutting teeth and a plurality of second cutting teeth are arranged on the blade; the first cutting teeth and the second cutting teeth are sequentially distributed at intervals from the top end to the bottom in the extending direction of the blade; the first cutting teeth and the second cutting teeth are protruded out of the surface of the blade; the height of the first cutting tooth protruding out of the surface of the blade is higher than that of the second cutting tooth protruding out of the surface of the blade; the bottom end of the blade is provided with a gauge protection block; and a third cutting tooth is arranged on the gauge block.

2. A PDC bit for efficient drilling of a gravel-laden complex formation according to claim 1 wherein the first cutting teeth have a cutting angle of between 12 ° and 15 °.

3. A PDC bit for efficient drilling of a gravel-laden complex formation according to claim 1 wherein the second cutting elements are in the form of spikes.

4. A PDC bit for efficient drilling of a gravel-laden complex formation according to claim 1 wherein the blades comprise a cutter distribution face and two side faces disposed on either side of the cutter distribution face; the cutting teeth are distributed on the cloth surface and the side surfaces extend along the extending direction of the blade; the two side surfaces and the distribution surface of the cutting teeth form an included angle; the first cutting teeth and the second cutting teeth are distributed on the cutting tooth cloth distribution surface.

5. The PDC bit for efficiently drilling into a gravel-laden complex formation of claim 4, wherein the sides of two adjacent blades are spaced apart and enclose a junk slot.

6. A PDC bit for efficiently drilling into a gravel-laden complex formation according to claim 5, wherein a nozzle is provided in the junk slot.

7. The PDC bit for efficiently drilling into a gravel-laden complex formation of any one of claims 1-6, wherein the bit body is provided with a projection at a tip center; the protruding part is made of wear-resistant materials.

8. The PDC bit for efficient drilling of a gravel-laden complex formation of any one of claims 1-6, wherein the plurality of blades includes three first blades and two second blades, each of the three first blades and the two second blades circumferentially spaced about a central axis of the bit body; the two second blades are respectively distributed between the two first blades; the length of the first plurality of blades is greater than the length of the second plurality of blades.