CN2355094Y

CN2355094Y - Disc roller cone bits

Info

Publication number: CN2355094Y
Application number: CN 98228864
Authority: CN
Inventors: 刘清友
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 1998-05-18
Filing date: 1998-05-18
Publication date: 1999-12-22
Anticipated expiration: 2008-05-18

Abstract

The utility model relates to a disc roller bits. The utility model is composed of teeth, roller cones, a lubricating system, connecting screw threads, a nozzle and tooth claws. The utility model is characterized in that annular continuous teeth are arranged on one or more roller cones of a drill bit, and the shape of the cross section of the teeth can be triangular, semicircular, trapezoidal, wedge-shaped or other reasonable shapes. As contact pressure is enhanced and the contact pressure continuously acts to the bottom of a well, the efficiency is breaking rocks is enabled to enhance, and thus, mechanic drilling rate is raised and energy consumption in breaking the rocks is lowered; at the same time, torque on the drill bit is caused to reduced, and the service life of a bearing and the service lives of teeth surfaces are extended.

Description

The dish type rock bit

The utility model relates to the dish type rock bit that is used for oil, gas drilling or other purpose drilling well, belongs to the drilling well utensil.

In oil, gas drilling, using maximum at present is three gear wheel steel-tooths (claim not only mill teeth) and hard-metal insert (but also claiming inserted) drill bit.From the evolution of rock bit as can be seen, though the life-span of rock bit has increased significantly, but because rock bit does not have much variations on tooth-shape structure in the last thirty years, and the efficiency of breaking rock of rock bit and tooth-shape structure are closely related, thereby the rate of penetration of rock bit is difficult to improve.In order to improve rate of penetration, the drill footage of rock bit (particularly in some special formations), must seek new tooth-shape structure.Disk bit is exactly a kind of rock bit of brand-new tooth-shape structure, because profile of tooth resembles dish type, thereby is called disk bit.

A few thing, the particularly former Soviet Union had been made in the research of disk bit abroad made number of research projects, and carried out field experiment aspect the disk bit.The U.S., Britain have also made a few thing aspect the disk bit in the later stage in the sixties.The disk bit that the former Soviet Union and the U.S. developed, gear ring are all made vertical with the gear wheel bus, thereby are mainly used in the drilling well of hard formation or extremely hard formation.Use this drill bit, reached sufficiently high rate of penetration, and can keep hole diameter.The work of China aspect disk bit also is in conceptual phase, does not also have any product at present and comes into the market, and it is that prospect is preferably arranged that the exploitation disk bit is applied in the drilling well.

The purpose of this utility model is, proposes a kind of mechanical drilling depth and bit speed that can improve drill bit, can not increase the dish type rock bit of the tooth structure of processing cost again.

In order to achieve the above object, the utility model is by the following technical solutions: the dish type rock bit mainly is made up of tooth (1), gear wheel (2), lubricating system (3), connecting thread (4), nozzle (5) and tooth pawl (6), it is characterized in that, on one or more gear wheels (2) of drill bit, arranged the continuous tooth (1) of annular, the section shape of tooth can be triangle, semicircle, trapezoidal, wedge shape or other rational shape according to instructions for use.The processing of gear ring can be carried out on lathe or milling machine continuously, and processing method is simple.The arrangement of the continuous gear ring on the gear wheel (2) can be vertical with the gear wheel bus according to designing requirement, or become certain helixangle (see figure 2), to adapt to the drilling well needs of Different Strata.The structures shape of disk bit is different from conventional rock bit in the rock breaking mechanism of disc drill bit, and it has changed effect characteristics and Cracking Mechanism thereof with rock, thus the application life of having improved the bearing and the flank of tooth.

The agent structure of disk bit is similar to existing tricone bit, also is made up of gear wheel and tooth pawl.It can be that single cone, two gear wheel, three gear wheels or polydonita wheel are formed.Main feature is that its profile of tooth is different with existing rock bit, and its flank of tooth is made the continuous gear ring of annular vertical with the gear wheel bus or that have certain helical angle.Because the flank of tooth structure of disk bit is different from existing profile of tooth gear ring (steel-tooth, inserted), it has changed the effect characteristics and the Cracking Mechanism thereof of tooth and rock, Figure 1 shows that the structural representation of dish type rock bit.When the continuous gear ring of disk bit rolls rolling along sillar, form the catalase of concentric circles annular, as shown in Figure 4.These broken rings are separated into single circle annular landwaste, and its size depends on the mechanical-physical character of gear ring spacing and rock.Because the circular fragmentation in shaft bottom has just increased rate of penetration, and reduced the energy consumption in the broken rock process, thereby improve drill footage.

The utility model has the advantages that:

(1), thereby improved rate of penetration and reduced broken rock energy consumption because contact pressure increases, and continuous action is improved efficiency of breaking rock in the shaft bottom;

(2) there be not the rolling of a tooth to another tooth in disk bit in drilling process, the moment of torsion on the drill bit is reduced, and it is minimum that drill bit and the interactional dynamic load of rock are reduced to, thus the application life of having improved the bearing and the flank of tooth;

(3) because tooth adopts is continuous gear ring, cancelled the mill teeth operation when taking a lot of work, thus the manufacturing process of drill bit simplified greatly, thus reduced the manufacturing cost of drill bit;

(4) by changing tooth-shape structure and cloth tooth helical angle, can enlarge the scope of application of disk bit more conveniently.

Description of drawings:

Fig. 1. the structural representation of dish type rock bit, (1) tooth among the figure, (2) gear wheel, (3) lubricating system, (4) connecting thread, (5) nozzle, (6) tooth pawl.

Fig. 2. the schematic diagram that disk bit gear wheel and tooth are arranged.

Fig. 3. for inlaying the A-A sectional drawing of (a) or built-up welding (b) on the drill teeth among Fig. 2

Fig. 4. during the disk bit drilling well and the cuttings shape schematic diagram that obtains after the rock effect.

Below in conjunction with description of drawings enforcement example of the present utility model:

As can be seen from Figure 1, the structure of whole disk bit and existing rock bit are basic identical, mainly are made up of tooth pawl (6) and gear wheel (2), and the number of tooth pawl and gear wheel can be one, two, three or more composition according to using needs.Figure 1 shows that the disk bits that three tooth pawls and three gear wheels are formed, be furnished with continuous gear ring (tooth) on three gear wheels, the cross sectional shape of tooth (1) can be triangle, semicircle, trapezoidal, wedge shape or other rational shape.According to different formation properties and drilling well requirement, dish type tooth (1) can arrange with certain helixangle along gear wheel (2), the size of space width also will be with the difference on boring stratum difference.Continuous dish type gear ring (1) can directly be processed on lathe or milling machine and obtain.In order to improve the abrasion resistance of tooth (1), can on tooth (1), inlay or other wear-resisting material of built-up welding, shown in Fig. 3 (a) and (b).

Claims

1. a dish type rock bit mainly is made up of tooth (1), gear wheel (2), lubricating system (3), connecting thread (4), nozzle (5) and tooth pawl (6), it is characterized in that, on one or more gear wheels of drill bit, arranged the continuous tooth of annular, the cross sectional shape of tooth can be triangle, semicircle, trapezoidal, wedge shape.

2. dish type rock bit according to claim 1 is characterized in that, the continuous gear ring on gear wheel can be vertical with the gear wheel bus or becomes certain helical angle.