CN214532800U

CN214532800U - Disc cutter type mixed roller bit

Info

Publication number: CN214532800U
Application number: CN202023213266.4U
Authority: CN
Inventors: 郗海华; 孙增光; 高飞; 阿地力萨地尔
Original assignee: Tianjin Lilin Bit Co ltd
Current assignee: Tianjin Lilin Bit Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-29
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to a roller bit, especially a mixed roller bit of disc cutter formula. The cone is connected with the bit leg through the shaft diameter arranged at the lower part of the bit leg, is locked by filling a steel ball through a steel ball channel arranged at the back of the bit leg, and can rotate around the shaft diameter of the bit leg; the outer surface of the roller cone is provided with a plurality of rows of cutting units which are axially arranged around the central line of the roller cone, and the roller cone is characterized in that: the outer surface of each cone comprises both steel teeth and cemented carbide teeth, and the steel teeth of the outer surface of each cone are of two types; the first is the common steel tooth type, and the second is the steel tooth of the disc cutter shape. The disc cutter type hybrid roller bit combines the advantages of roller bits and has the working performance of PDC bits. The main cutting teeth of the disc cutter type hybrid roller bit comprise both steel teeth and hard alloy teeth, the excellent impact resistance of the steel teeth is fully exerted, and the high wear resistance of the hard alloy teeth is reflected.

Description

Disc cutter type mixed roller bit

Technical Field

The utility model relates to a roller bit, especially a mixed roller bit of disc cutter formula.

Background

The drill bit is a rock breaking tool used to break rock during drilling to form a wellbore. The most widely used rock breaking tools at present are mainly fixed-tooth cutting bits and non-fixed-tooth cutting bits. The most widely used of the fixed-tooth cutting drill bits is the PDC drill bit, i.e., a polycrystalline diamond compact drill bit; the non-fixed tooth cutting bit is mainly a roller bit which can be divided into two categories according to the type of teeth, wherein one category is an insert roller bit, and the other category is a steel tooth milling roller bit.

The cone bit has wide application range, is applicable to extremely soft stratum to extremely hard stratum and is an ideal rock breaking tool at present, but is difficult to deal with some complex strata along with continuous deepening of oil and gas exploration and development. Particularly, the torque and the axial vibration of the roller bit are large in the drilling process of some deep wells and ultra-deep wells, and particularly the axial vibration is large. The reasons for the axial vibration are: when the teeth of the roller cone alternately contact with the well bottom, the gravity center of the roller cone bit is changed. On one hand, the axial vibration is beneficial to breaking rocks, increasing the scale and extending the well hole; on the other hand, the cone and the bearing of the cone leg bear large axial load due to axial vibration, even the bearing fails early, so that the hard alloy teeth can be broken sometimes, and unnecessary construction problems are caused for the drilling construction of the subsequent drill bit.

SUMMERY OF THE UTILITY MODEL

The utility model provides a detachable stool backrest for effectively solving the problems in the background technology, and the specific technical proposal is as follows;

a disc cutter type mixed roller bit comprises a bit leg and a roller cone, wherein the roller cone is connected with the bit leg through the shaft diameter arranged at the lower part of the bit leg, and is locked by filling a steel ball through a steel ball channel arranged at the back of the bit leg, and can rotate around the shaft diameter of the bit leg; the outer surface of the roller cone is provided with a plurality of rows of cutting units which are axially arranged around the central line of the roller cone, and the roller cone is characterized in that: the outer surface of each cone comprises both steel teeth and cemented carbide teeth, and the steel teeth of the outer surface of each cone are of two types; the first is the common steel tooth type, and the second is the steel tooth of the disc cutter shape.

Preferably, the carbide tips on each row of cutting elements of each cone are higher than the exposed height of the steel tips.

Preferably, the carbide and steel teeth on each row of cutting elements of each cone are exposed at the same height.

Preferably, the carbide tips on each row of cutting elements of each cone are exposed at a lower height than the steel tips.

Preferably, the surface of the steel teeth on each cone is coated with a wear-resistant alloy.

Compared with the prior art, the beneficial effects of the utility model are that: 1. the disc cutter type hybrid roller bit combines the advantages of roller bits and has the working performance of PDC bits. The main cutting teeth of the disc cutter type hybrid roller bit comprise both steel teeth and hard alloy teeth, the excellent impact resistance of the steel teeth is fully exerted, and the high wear resistance of the hard alloy teeth is reflected. 2. The teeth of the disc cutter type hybrid cone bit are similar to disc cutters, the problem that single and double teeth touch the bottom alternately is solved, the axial vibration caused by the problem except for extremely individual tooth rows, for example, two rows exist at most in one cone at the tooth row of the nose part of the cone, and the position of the cone is close to the center of a well hole, so that the teeth in contact with the well bottom roll smoothly at the well bottom, the bearing vibration of the bit can be obviously reduced, and the disc cutter type hybrid bit can crush rock under the working condition similar to static load. 3. The disc cutter type hybrid roller bit has the characteristics of small working torque, high bottom coverage rate and long service life of a bearing. 4. The service life of the disc cutter type hybrid roller bit is prolonged, the total footage of the bit is naturally increased, the drilling period is shortened, and therefore the drilling cost is correspondingly reduced.

Drawings

FIG. 1 is a schematic structural view of a disc cutter type hybrid roller bit with cemented carbide teeth higher than steel teeth;

FIG. 2 is a schematic representation of a cone of a disc cutter hybrid roller bit having carbide teeth higher than steel teeth;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a schematic structural view of a disc cutter type hybrid roller bit with carbide teeth flush with steel teeth;

FIG. 5 is a schematic cone diagram of a disc cutter hybrid roller cone drill bit with carbide teeth flush with steel teeth;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a schematic structural view of a disc cutter type hybrid roller cone bit with cemented carbide teeth lower than steel teeth;

FIG. 8 is a schematic cone diagram of a disc cutter hybrid roller cone drill bit having cemented carbide teeth below steel teeth;

fig. 9 is a top view of fig. 8.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided in connection with the accompanying drawings. As shown in fig. 1, example 1:

as shown in fig. 1-3, a disc cutter type hybrid roller bit comprises a bit leg 1 and a roller cone 2, wherein the roller cone 2 is connected with the bit leg 1 through the axial diameter arranged at the lower part of the bit leg 1, and is locked by filling a steel ball through a steel ball channel arranged at the back of the bit leg 1 and can rotate around the axial diameter of the bit leg; and a plurality of rows of cutting units are arranged on the outer surface of the roller cone 2. A bit leg unit is composed of a bit leg 1 and a cone 2, and a cone bit is composed of the three bit leg units in a welding mode and connected with a drilling tool through a screw thread at the tail of the bit.

As the utility model discloses an option is that the cutting unit at 2 surfaces of gear wheel comprises

steel tooth

3, 4 and inserted tooth 5 respectively, keeps away from the similar disc cutter shape of the tooth row appearance of 2 nasal parts of gear wheel, processes the perforation and inlays carbide tooth 5 on steel tooth 4, requires carbide tooth 5 to be higher than steel tooth 4 simultaneously, exposes highly to be higher than about 2 ~ 2.5mm of steel tooth 4.

Example 2:

as shown in fig. 4 to 6, this example is substantially the same as embodiment 1 except that: the cutting units on the outer surface of the cone 2 respectively comprise

steel teeth

3 and 4 and inserts 5, the tooth row shape far away from the nose part of the cone 2 is similar to a disc cutter shape, tooth holes are machined in the steel teeth 4, the hard alloy teeth 5 are embedded in the tooth holes, and the hard alloy teeth 5 and the steel teeth 4 are required to be exposed to be level.

Example 3:

as shown in fig. 7 to 9, this example is substantially the same as embodiment 1 except that: the cutting units on the outer surface of the cone 2 are respectively composed of

steel teeth

3 and 4 and inserts 5, the tooth row shape far away from the nose part of the cone 2 is similar to a disc cutter shape, tooth holes are machined in the steel teeth 4, hard alloy teeth 5 are embedded in the steel teeth 4, meanwhile, the hard alloy teeth 5 are required to be lower than the steel teeth 4, and the exposed height is about 1-2 mm lower than the steel teeth 4.

In the above 3 embodiments, a layer of wear-resistant alloy is applied to the surfaces of the

steel teeth

3 and 4 which are not embedded with the cemented carbide teeth 5, so as to improve the wear resistance of the

steel teeth

3 and 4.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A disc cutter type mixed roller bit comprises a bit leg and a roller cone, wherein the roller cone is connected with the bit leg through the shaft diameter arranged at the lower part of the bit leg, and is locked by filling a steel ball through a steel ball channel arranged at the back of the bit leg, and can rotate around the shaft diameter of the bit leg; the outer surface of the roller cone is provided with a plurality of rows of cutting units which are axially arranged around the central line of the roller cone, and the roller cone is characterized in that: the outer surface of each cone comprises both steel teeth and cemented carbide teeth, and the steel teeth of the outer surface of each cone are of two types; the first is the common steel tooth type, and the second is the steel tooth of the disc cutter shape.

2. The disc cutter hybrid roller cone drill bit of claim 1, wherein: the carbide tips on each row of cutting elements of each cone are higher than the exposed height of the steel tips.

3. The disc cutter hybrid roller cone drill bit of claim 1, wherein: the carbide teeth and steel teeth on each row of cutting elements of each cone are exposed to the same height.

4. The disc cutter hybrid roller cone drill bit of claim 1, wherein: the carbide tips on each row of cutting elements of each cone are exposed at a lower height than the steel tips.

5. The disc cutter hybrid roller cone drill bit of claim 1, wherein: and the surface of the steel tooth on each cone is coated with wear-resistant alloy.