CN2307904Y

CN2307904Y - Tri-cone rotary drill bit cutting structure

Info

Publication number: CN2307904Y
Application number: CN 97240941
Authority: CN
Inventors: 刘学中; 邵增元
Original assignee: Jianghan Petroleum Administration Drill Bit Factory
Current assignee: Jianghan Petroleum Administration Bureau bit Co.,Ltd.
Priority date: 1997-06-17
Filing date: 1997-06-17
Publication date: 1999-02-17
Anticipated expiration: 2007-06-17

Abstract

The utility model discloses the novel cutting structure of a roller bit. The distinction between the utility model and the traditional cutting structure of a roller bit lays in that supplementary teeth are inlaid among cardinal teeth, and at least one cone bit of an insert cone is composed of steel teeth. The utility model is characterized in that the coverage coefficient of a drill bit to rocks at the bottom of a well, the steel teeth of the cone bit avoids the phenomena that the original inserted tooth of the cone bit break and fall, and thus, the purposes of raising the mechanical penetration rate of the drill bit and reducing the cost in drilling a well are realized.

Description

A kind of novel rock bit cutting structure

The utility model relates to oil, mine and geology department drilling well insert bit, is a kind of novel rock bit cutting structure.

At present, general rock bit is made up of gear wheel, bit leg and attached finding, and gear wheel endoporus and bit leg journel constitute a supplementary bearing, and drill bit is when underground work, and not only drill bit revolution of gear wheel is also around himself axis rotation.Be furnished with at interval hard-metal insert on each conical surface of tungsten carbide insert bit gear wheel, drill bit relies on carbide button to mode fractured rocks such as the impact in shaft bottom, crushing, shearings.

There is following problem in existing rock bit cutting structure: 1, especially a gear wheel apical tooth breaks gear wheel wheel pointed tooth, to fall situation more.Reason is that after being bumped into carbide button, matrix strength further weakens because gear wheel is taken turns the restriction of sharp geometry.After the wheel pointed tooth breaks, falls, be formed centrally core in well, cause the wearing and tearing of gear wheel wheel point, rate of penetration reduces, and the carbide button of falling in the well also can cause the tooth fracture at other positions of gear wheel, causes drill bit to lose efficacy; 2, housing serious wear between cutter teeth, tooth carbide button disconnected, broken especially gear wheel master gear ring is disconnected, broken situation is more, directly causes the drill bit rate of penetration to cross low and pull out of hole, drill bit is scrapped.

The purpose of this utility model provides a kind of novel rock bit cutting structure; can not only improve coverage coefficient and the stock-removing efficiency of drill bit to the shaft bottom; can also protect carbide button and cone shell effectively, reduce disconnected, the broken and cone shell wearing and tearing of carbide button, prolong drilling life of bit.The purpose of this utility model is achieved in that and is bumped into the secondary tooth of carbide alloy between gear wheel gear ring and teeth groove, 0～90 ° of the angle degree of secondary tooth tooth top and gear wheel axis, its diameter and proud exposure are all little than main tooth, be mainly used in not fragmented rock of the main between cog of cutting, prevent its wearing and tearing cone shell, and share a part and impact, thereby reach protection carbide button and cone shell, improve the purpose of shaft bottom coverage coefficient, after being bumped into secondary tooth, the proud exposure of main tooth also can correspondingly increase, and can improve the rate of penetration of drill bit like this; It is inserted to cancel the wheel point in addition, directly gear wheel is taken turns point and mills into profile of tooth, applies the weldering high-abrasive material then, and breaking, fall tooth and taking turns sharp housing wear phenomenon of causing guarantees effective cutting at well center with regard to having avoided taking turns sharp matrix weakness like this.

Adopt such scheme, only changed the cutting structure of drill bit, and do not changed other parts of drill bit, can reach the stock-removing efficiency and the rate of penetration that improve drill bit, prolong drilling life of bit, reduce the purpose of drilling cost, practical, technology is simple, cost is low, effective.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1, be gear wheel engagement figure of the present utility model.

Fig. 2, be that the utility model shaft bottom smashes figure.

Fig. 3, be a kind of pointed tooth structure chart of taking turns of the present utility model.

Number among the figure: 1,3# gear wheel, 2, main tooth, 3, gear ring, 4, teeth groove, 5, the 1# gear wheel, 6,1# gear wheel wheel point, 7, secondary tooth, 8, the 2# gear wheel, 9,2# gear wheel wheel point, 10, bit leg, 11, the shaft bottom

1# gear wheel wheel point (6) mills into the steel-tooth (2# gear wheel wheel point (9) mill teeth figure and engagement figure, shaft bottom smash figure slightly) of Fig. 3 form among Fig. 1,1～6 of the number of teeth, apply the weldering high-abrasive material on the flank of tooth and between the gear ring (3) of each gear wheel and teeth groove (4), be bumped into secondary tooth (7), in the main tooth of every row both sides, secondary tooth (7) can be two rows, also can be a row, its diameter and proud exposure be all little than main tooth (2), and the angle of secondary tooth tooth top and gear wheel axis is 0～90 °.

Not broken protruding endless belt among Fig. 2 between the main tooth (2) is by secondary tooth (7) fragmentation.

Claims

1. a novel rock bit cutting structure is characterized in that gear wheel is bumped into the secondary tooth of a row at least, and has at least the wheel pointed tooth of an insert cone to be made up of steel-tooth.

2. a kind of novel rock bit cutting structure according to claim 1 is characterized in that secondary tooth is set between gear wheel gear ring and the teeth groove, and the angle of tooth top and gear wheel axis is 0-90 °;

3. a kind of novel rock bit cutting structure according to claim 1 is characterized in that secondary tooth diameter and proud exposure are the 20%-90% of main tooth;

4. a kind of novel rock bit cutting structure according to claim 1 is characterized in that secondary tooth made by hard-metal insert;

5. a kind of novel rock bit cutting structure according to claim 1 is characterized in that gear wheel wheel point directly mills into the steel-tooth profile of tooth, and apply high-abrasive materials such as weldering tungsten carbide or diamond on the flank of tooth;

6. a kind of novel rock bit cutting structure according to claim 1 is characterized in that it is 1-6 that gear wheel is taken turns sharp steel-tooth.