CN213775257U

CN213775257U - PDC drill bit with wide top ridge teeth

Info

Publication number: CN213775257U
Application number: CN202022094531.5U
Authority: CN
Inventors: 况雨春; 杨博; 秦超; 王勤
Original assignee: Chengdu Hairui Energy Technology Co ltd; Southwest Petroleum University
Current assignee: Chengdu Yanshi Innovation Technology Co.,Ltd.; Southwest Petroleum University
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-07-23
Anticipated expiration: 2030-09-22

Abstract

The utility model relates to a PDC drill bit with broad top bead tooth belongs to drilling equipment instrument fields such as oil and gas drilling, geological exploration, mine engineering, building foundation engineering construction. Comprises a drill body, a back row of teeth, main cutting teeth and broad top fin teeth. Wide top bead tooth comprises top and bottom, and the top comprises top surface, toper bead face and 2 at least inclined planes. The inclined surface and the conical convex edge surface are arranged at intervals around the top surface along the circumferential direction. The axis of the wide-top fin tooth and the normal of the PDC drill bit crown face form an installation elevation angle, and the auxiliary cutting function of the wide-top fin tooth is enhanced. Wide top bead tooth and PDC drill bit can strengthen cutting ability, stability and the wearability of drill bit, extension drill bit life-span.

Description

PDC drill bit with wide top ridge teeth

Technical Field

The utility model relates to a PDC drill bit with broad top bead tooth belongs to drilling equipment instrument fields such as oil and gas drilling, geological exploration, mine engineering, building foundation engineering construction.

Background

Polycrystalline diamond compacts, also known as PDC compacts (or PDC teeth), are widely used in PDC drill bits due to their high hardness and high wear resistance. Statistically, more than 90% of the worldwide oil and gas drilling footage is now done by PDC bits. Along with the development of oil and gas wells to deep wells and ultra-deep wells gradually, higher requirements are provided for PDC drill bits, designers innovate and transform the PDC drill bits in the aspects of structure, materials, cutting teeth, cutting parameters and the like, and the performance of the PDC drill bits is continuously improved. At present, PDC bits have been dominant in the fields of oil drilling and the like.

The cutting elements of conventional PDC bits are typically secured to stationary blades of a bit body. When a high-hardness and high-abrasiveness stratum works, the abrasion rate of the cutting teeth is high, so that the service life of the drill bit is short; when the drill bit works in a heterogeneous stratum or a soft and hard interlayer, due to unstable eating depth and larger impact vibration, abnormal abrasion of the cutting teeth is aggravated, the impact collapse phenomenon is increased, and the service life of the drill bit is obviously reduced. Although the auxiliary cutting teeth are used in the tooth arrangement design of the PDC drill bit at present, the conventional auxiliary cutting teeth have the same geometric characteristics with the main cutting teeth, the contact area with the rock is small, and the auxiliary cutting capacity and the function of limiting the depth of cut are limited. In addition, the conventional auxiliary cutting teeth are easy to wear and break by impact, the auxiliary cutting effect is lost in advance, the rock breaking burden of the main cutting teeth is increased, and the service life of the drill bit is shortened.

Disclosure of Invention

An object of the utility model is to solve above-mentioned problem and provide a PDC drill bit with wide top bead tooth, the cutting ability and the stability of reinforcing drill bit, extension drill bit life-span.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a PDC drill bit with wide top bead tooth, includes the cutting teeth of arranging on bit body and the bit body, at least one cutting tooth is wide top bead tooth on the bit body, wide top bead tooth comprises top and bottom and concreties on the PDC bit body through the bottom, the top of wide top convex bead tooth comprises top surface and toper bead face and 2 at least inclined planes, the inclined plane is arranged along circumference interval with toper convex bead face, the cone angle on inclined plane more than or equal to the cone angle of toper convex bead face, the bottom of wide top convex bead tooth is the cylinder.

Preferably, the bottom of the convex ridge tooth with the wide top is a cylinder.

Preferably, the taper angle of the inclined surface is 170 ° or less, and the taper angle of the tapered convex land is 160 ° or less.

Preferably, the top surface of the broad top fin tooth is planar.

Preferably, the top surface of the broad top fin tooth is a convex curved surface.

Preferably, the top surface of the broad top fin tooth is a concave curved surface.

Preferably, the inclined plane of the wide-top convex ridge tooth is a plane.

Preferably, the inclined plane of the wide-top convex ridge tooth is a convex curved surface.

As the preferred scheme, the inclined plane of the convex arris tooth with the wide top is a concave curved surface.

As the preferred scheme, the inclined plane and the conical convex edge surface are symmetrically and uniformly distributed at intervals along the circumferential direction.

The top surface of the broad-top fin teeth is made of polycrystalline diamond, impregnated diamond or cubic boron nitride material, and the bottom of the broad-top fin teeth is made of hard alloy or impregnated diamond material. The broad-top fin teeth are arranged on the rear row of blades of the PDC drill bit and used as backup teeth for assisting cutting and limiting the depth of penetration, and the included angle between the axis of the broad-top fin teeth and the normal of the crown surface of the PDC drill bit, namely the range of the installation elevation angle c is 0< c <15 degrees. The edge of the wide top rib tooth closest to the front row of teeth and the radius Rc of the position where the teeth are distributed on the circumference of the drill form an included angle in the axial projection, namely the tooth rotation angle d, and the range is-15 degrees < d <15 degrees.

According to the above technical scheme, the utility model discloses an advantage and positive effect of PDC drill bit with broad top bead tooth lie in:

when the broad-top fin tooth just starts to work, because the included angle c exists between the axis of the tooth and the normal line of the PDC drill bit crown surface, the frontmost ridge in the cutting direction can be used as a cutting edge to participate in rock breaking, so that the rock breaking burden of the main cutting tooth is shared, the abrasion of the main cutting tooth is reduced, and the service life of the drill bit is prolonged. After the frontmost edge in the cutting direction works for a period of time, the capability of being eaten into rocks is reduced due to abrasion, the function of participating in rock breaking is reduced, the eating depth of the main cutting teeth is limited, the bad phenomena of drill bit stick-slip, cutting teeth collapse and the like caused by the fact that the main cutting teeth are too deep to eat into the rocks are avoided, and the service life of the drill bit is further prolonged. On the other hand, when one ridge of the wide-top fin tooth cannot be eaten into rock due to abrasion, the wide-top fin tooth can rotate for a certain angle during maintenance, a brand-new ridge is used as a cutting edge to participate in rock breaking again, the interchangeability and the utilization rate of the tooth are enhanced, and the cost is saved.

Drawings

The various objects, features and advantages of the present invention will become more apparent from the detailed description of the invention when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention, which is not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

fig. 1 is a perspective view of the PDC drill bit with broad-top teeth of the present invention.

Fig. 2 is a schematic view of a wide-crest convex edge tooth according to embodiment 1 of the present invention.

Fig. 3 is the schematic view of the cone angle of the tapered convex surface of the broad-top convex rib teeth of the present invention.

Fig. 4 is a schematic view of the taper angle of the tooth slope of the broad-top rib of the present invention.

Fig. 5 is a schematic view of a broad-top fin tooth according to embodiment 2 of the present invention.

Fig. 6 is the installation elevation angle schematic diagram of the PDC drill bit with the wide-top convex edge teeth of the present invention.

Fig. 7 is a schematic diagram of the tooth rotation angle of the PDC drill bit with a broad-top ridge tooth of the present invention.

Wherein, 1 is a drill bit body, 2 is a rear row of teeth, 3 is a main cutting tooth, 4 is a wide-top convex prismatic tooth, 5 is a bottom, 6 is an inclined plane, 7 is a top surface, 8 is a conical convex prismatic surface, and 9 is a drill crown surface. a represents the taper angle of the conical convex edge surface, b represents the taper angle of the inclined surface, c represents the installation elevation angle, d represents the rotation angle of the tooth, and Rc represents the radius of the position of the broad-top convex edge tooth with the axis of the drill bit as the center of the circle.

Detailed Description

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, as will be apparent from or reasonably suggested by the following detailed description of embodiments of the invention, taken in conjunction with the accompanying drawings. Based on the embodiments in the present invention, all other embodiments obtained without creative work by the ordinary skilled person in the art belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the PDC drill bit with broad top teeth comprises a bit body 1, a rear row of teeth 2, main cutting teeth 3 and broad top teeth 4. The broad-top fin tooth 4 is characterized in that the broad-top fin tooth 4 is composed of a top part and a bottom part 5 as shown in figure 2, the top part of the broad-top fin tooth 4 is composed of a top surface 7, a conical convex edge surface 8 and at least two inclined surfaces 6, the inclined surfaces 6 and the conical convex edge surface 8 are arranged at intervals along the circumferential direction, and the bottom part 5 of the broad-top fin tooth 4 is a cylinder and is fixedly connected on the drill bit body 1 through the bottom part 5. The projection area of the top surface 7 in the axial direction is not too small, and is at least 0.2 times larger than the cross-sectional area of the bottom part 5. The top surface of the broad-top fin teeth 4 is made of polycrystalline diamond, impregnated diamond or cubic boron nitride material, and the bottom is made of hard alloy or impregnated diamond material.

As shown in fig. 3, the profile line of the projection of the tapered convex surface 8 of the broad-top fin tooth 4 in the radial direction forms an included angle, which is the tapered convex surface cone angle a, and the range is 0< a <160 °. As shown in fig. 4, the taper angle b formed by the tangent plane of the contour line of the slope 6 projected in the radial direction is in the range of 0< b <170 °, and the slope taper angle b is equal to or greater than the taper angle a of the tapered convex land. The top surface 7 of the wide top lug tooth 4 is a plane, a convex curved surface or a concave curved surface. The inclined plane 6 of the broad top convex rib tooth 4 is a plane, a convex curved surface or a concave curved surface. The inclined planes 6 and the conical convex edge surfaces 8 are symmetrically and uniformly distributed at intervals along the circumferential direction.

As shown in fig. 6, the broadtop lugs 4 are arranged on the back row of the bit blades. When drilling a rock, the rock is contacted and crushed by the front row of main cutting teeth 3, and the broad top fin teeth 4 perform auxiliary cutting as backup teeth, thereby reducing the wear of the main cutting teeth 3. After the broad-top fin teeth 4 assist in cutting for a period of time, the cutting edges are worn and are gradually difficult to eat into rocks, and the broad-top fin teeth can be used as buffer teeth to limit eating depth. The axis of the broad top fin tooth 4 and the normal of the PDC drill bit crown face form a certain included angle, namely an installation elevation angle c, and the range is 0-15 degrees. The edge of the broad top lug tooth 4 closest to the front row of teeth 3 forms an included angle with the radius Rc of the position where the teeth are distributed on the circumference of the drill bit in the projection of the axial direction, namely the tooth rotation angle d, and the range is-15 degrees < d <15 degrees, as shown in figure 7.

Example 1

As shown in fig. 1, 2, 6 and 7, the PDC drill bit with the broad top fin teeth consists of a drill bit body 1, a back row of teeth 2, main cutting teeth 3 and broad top fin teeth 4. The top of the broad top fin teeth 4 has two inclined surfaces 6, a top surface 7, and a conical fin surface 8. The two inclined planes 6 are convex curved surfaces, and the included angle inclined plane cone angle b of the tangent plane is 87 degrees; the top surface 7 is a convex curved surface; the conical convex land cone angle a is 40 °. The included angle between the axis of the broad-top fin tooth 4 and the normal of the PDC drill bit crown surface, namely the installation elevation angle c is 10 degrees; the edge of the broad-top rib tooth 4 closest to the front row of teeth 3 forms an included angle with the radial Rc of the position where the teeth are distributed on the circumference of the drill bit in the axial projection mode, namely the tooth rotation angle d is 5 degrees. This embodiment enables the broad-top teeth 4 to have a strong cutting-assist effect, and the design of the upper convex ramp 6 and the upper convex top surface 7 can increase the strength of the top, enabling the broad-top teeth 4 to have a certain wear resistance while maintaining a strong aggressiveness.

Example 2

As shown in fig. 1, 5, 6 and 7, the PDC drill bit with the broad top fin teeth consists of a drill bit body 1, a back row of teeth 2, main cutting teeth 3 and broad top fin teeth 4. The top of the broad top fin teeth 4 has three inclined surfaces 6, a top surface 7, and a conical fin surface 8. Two adjacent inclined planes 6 in the three inclined planes are straight planes, and the included angle inclined plane cone angle b of the tangent plane is 96 degrees; the top surface 7 is a straight surface; the conical convex land cone angle a is 40 °. The included angle between the axis of the broad-top fin tooth 4 and the normal of the PDC drill bit crown surface, namely the installation elevation angle c is 5 degrees; the edge of the broad-top rib tooth 4 closest to the front row of teeth 3 forms an included angle with the radial Rc of the position where the teeth are distributed on the circumference of the drill bit in the axial projection mode, namely the tooth rotation angle d is 5 degrees. The embodiment can enable the wide top lug teeth 4 to have larger areas of the top surfaces 7, can effectively limit the eating depth of the front row of teeth 3, and reduces the vibration of the drill bit; the smaller mounting elevation angle c can enhance the auxiliary cutting effect of the broad-top teeth 4, so that the broad-top teeth 4 have certain intrusiveness while maintaining strong wear resistance.

Some preferred embodiments of the invention have been described above with reference to the accompanying drawings. It is to be understood by one of ordinary skill in the art that the specific structures and processes shown in the detailed description are exemplary only and not limiting. Moreover, a person skilled in the art can combine the various technical features shown in the above description in various possible ways to form new technical solutions, or make other modifications, and all fall within the scope of the present invention.

Although the present invention has been disclosed with reference to embodiments, numerous variations and modifications may be made to the described embodiments without departing from the scope and ambit of the invention. It is to be understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the scope of the appended claims and their equivalents.

Claims

1. The utility model provides a PDC drill bit with broad apex fin tooth, includes the cutting teeth of arranging on bit body and the bit body, its characterized in that: the PDC bit body is characterized in that at least one cutting tooth on the bit body is a broad-top convex edge tooth, the broad-top convex edge tooth consists of a top part and a bottom part and is fixedly connected to the PDC bit body through the bottom part, the top part of the broad-top convex edge tooth consists of a top surface, a conical convex edge surface and at least 2 inclined surfaces, the inclined surfaces and the conical convex edge surface are arranged at intervals in the circumferential direction, the cone angle of each inclined surface is larger than or equal to the cone angle of the conical convex edge surface, and the bottom part of the broad-top convex edge tooth is a cylinder.

2. The PDC bit with broad crest teeth of claim 1, wherein: the bottom of the wide-top convex edge tooth is a cylinder.

3. The PDC bit with broad crest teeth of claim 1, wherein: the taper angle of the inclined plane is less than or equal to 170 degrees, and the taper angle of the conical convex edge surface is less than or equal to 160 degrees.

4. The PDC bit with broad crest teeth of claim 1, wherein: the top surface of the wide-top convex edge tooth is a plane.

5. The PDC bit with broad crest teeth of claim 1, wherein: the top surface of the wide top rib tooth is a convex curved surface.

6. The PDC bit with broad crest teeth of claim 1, wherein: the inclined plane of the convex edge tooth with the wide top is a plane.

7. The PDC bit with broad crest teeth of claim 1, wherein: the inclined plane of the wide-top convex edge tooth is a convex curved surface.

8. The PDC bit with broad crest teeth of claim 1, wherein: the inclined plane and the conical convex edge surface are symmetrically and uniformly distributed at intervals along the circumferential direction.

9. The PDC bit with broad crest teeth of claim 1, wherein: the wide top fin teeth are arranged on blades of the PDC drill bit, and the included angle between the axis of the wide top fin teeth and the normal of the crown surface of the PDC drill bit ranges from 0 degree to 15 degrees.

10. The PDC bit with broad crest teeth of claim 1, wherein: the broad-top rib teeth are arranged on the rear row of PDC drill bit blades.