SU1413229A1 - Core drill - Google Patents

Abstract

The invention relates to a drilling technique and allows to increase the penetration of the bit by making supports with the maximum possible radial and axial dimensions that fit into the conical part of the roller cone (W). The chisel contains a sleeve 1 installed on it and the lap 2 welded to each other. On their cantilever trunnions 3, 4, conical Ø 5, 6 with insert carbide inserts are mounted by means of supports. Oppositely mounted W 5, 6 form a core-forming or well-forming pair of W. The supports of each pair are made according to the same bearing pattern. Drilling a bore with a chisel is dried by drilling it around its own axis and creating an axial load. 4 il.

Description

S

(L

with y

(ABOUT

QO

The invention relates to a drilling technique, namely, a rock cutting tool for drilling wells with coring during high-speed drilling.

The aim of the invention is to increase the penetration of the bit by making supports with the maximum possible radial and axial dimensions to fit into the conical part of the roller cutter.

FIG. 1 shows the core bit, obsh, iy kind; in fig. 2 is a view A of FIG. one; in fig. Figures 3 and 4 are the adjacent core bits and the ratios of the dimensions of their supports by overlapping one another.

A chisel consists of a central hub 1 and four paws 2, mounted on it, welded to each other and forming the body of the chisel. The pins 3 and 4 are equipped with roller cones 5 and 6. In one pair of cones (5), the supports are made with the maximum possible radial dimensions. In the most dangerous sections of the conical part of the body (sections with the minimum allowable thickness, a different wall) there are no insert teeth, and the overlap of the corresponding part of the bottom is dried with teeth located on the bodies of another pair of cones. In this connection, the thickness of the wall of the housing of the balls in the absence of carbide inserts is equal to the minimum allowable value h determined by other

five

0

five

characteristics of the material of the cutter body.

The other pair of cutters (6) supports are made with the maximum possible axial dimensions. The wall thickness of the housing of the cutters in the zone of the absence of carbide inserts, similar to a pair of cutters 5, is equal to the minimum allowable value / g, determined by the strength characteristics of the material of the housing of the cutter.

The well is drilled with the proposed drill bit by rotating it around its own axis and creating an axial load.

Claims (1)

Invention Formula A core bit containing a sleeve, mounted on it and welded to each other paws, on the console trunnions of which, by means of supports, are installed conical cone cutters with insert carbide teeth, characterized in that, in order to increase the penetration of the bit by making supports with the maximum possible radial and axial dimensions inscribed into the conical part of the cones, the oppositely installed cones form a core-forming or well-forming pair of cones, and the supports of each pair are made of the same c IU bearings. FIG. 2 Phage-W Fig.Ch