SU1348483A1 - Drill bit - Google Patents

Abstract

The invention relates to mining and allows to reduce the beam formation and improve the durability of the cone. It contains crowns with teeth placed in groups with constant spacing within groups and variables between groups. A group of teeth with a smaller pitch on one crown alternates with a group of teeth with a large pitch on the other crown along the generatrix. Moreover, the teeth on each one crown are of equal strength with the same departure or height. This makes it possible to reduce the vibration of the roller cutter and to have uniform wear of the teeth, to reduce the possibility of the jamming of the roller cones. 2 Il. C in SL CX) 4 00 WITH

Description

one

The invention relates to mining, in particular to roller cone bits used for drilling oil and gas wells.

The purpose of the invention is to reduce rectification and increase the durability of the cone.

FIG. 1 shows three crowns with two

groups of steps t

H i in

shorter t

tg DRU a group of teeth in increments

t alternates along the forming cone with groups of teeth with a pitch of t, t. and t. And in groups of teeth

A group of teeth with alternates with groups of teeth with a large pitch t, and t gih crowns.

with large steps and more robust teeth.

FIG. 2 shows two crowns with three groups of steps. Tsags meet the requirement of inequality; t t j

 t, and t. t t

Insert group

(zubkov) with a smaller pitch t alternates along the forming cone with a group of teeth with a large pitch t, the group

 with t

and the middle pitch on the first crown t; t - with the average pitch on the second crown t. Moreover, in groups of embroiderments with a large step t and t there are 30 angular forms of rock attack.

and stronger inserts than in the groin of teeth with smaller steps t and t,, t

t

groups 3 steps

..j,, Inserts in groups with /; tg more durable than in groups with steps

t and t,

A tooth with a large pitch is more durable than a tooth with a smaller pitch.

A change in the strength of the inserted teeth is achieved by changing the diameter while maintaining the departure and shape or changing the shape of the rock-breaking head 1 (if its drilled strength of the rocks corresponds) while maintaining the diameter and departure of the tooth. A change in the strength of the milled weapon is achieved by a change in the dullness

40

45

Claims (1)

Formula invented A drill bit of drill bits with teeth, placed in groups with constant steps of group and variable between, different with that, with the aim of reducing the drawdown and increasing the durable work, the group of teeth with one needle on one of the crowns alternates with the teeth the crown step along the forming ball than the teeth on each one are filled with equal strength with one flight or height. 15 A832 neither preserving the sharpening angle and height, or changing the sharpening angle, but its correspondence to the drilled rock, while maintaining the height and dullness. This will make it possible to more effectively influence the teeth of the crowns on the rock by changing the angles of its attack with a change in the shape of the tooth. Application of teeth on a crown on a tooth x or groups of teeth with a smaller pitch of smaller diameters of the inserted teeth or a smaller blunting of the teeth will increase their specific load. At the boundary of the transition of groups it is necessary to put more durable teeth (from the group with a large step), since the tooth participates in the work of groups with larger and smaller steps. ten Alternation of teeth along a forming shred or a group of teeth with a larger and smaller pitch will reduce the vibration of the cone, and the use of equal strength teeth on the crown will allow them to wear evenly, reduce the possibility of sticking cones, increase the effectiveness of the impact of weapons on the rock by increasing specific loads and various Invention Formula The bit of a drill bit, including crowns with teeth, placed in groups with constant pitch within the group and variable between the group, characterized in that with a reduction in reyko formation and increase in the durability of its work, the group of teeth with a smaller pitch one crown alternates with a group of teeth with a large pitch on the other crown along the forming cone, with the teeth on each one crown being made of equal strength with the same departure or height. Compiled by A. Khromin Editor A, Dolynich Tehred L. Serdyukova Proofreader A. Zimokosov Order 5173/31 Circulation 532 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5 Production and printing company, Uzhgorod, st. ITpoeKTHaf, 4