CN2033045U

CN2033045U - Artificial diamond core-extracting drill bit

Info

Publication number: CN2033045U
Application number: CN 87213439
Authority: CN
Inventors: 易贵华; 席顺民; 高二虎; 杨希贤
Original assignee: DRILLING TECHNOLOGY INST XINJI
Current assignee: DRILLING TECHNOLOGY INST XINJI
Priority date: 1987-09-01
Filing date: 1987-09-01
Publication date: 1989-02-22

Abstract

The utility model discloses an artificial diamond core-extracting drill bit, which is composed of top and bottom two parts welded together. The former quincunx of the inner hole of the drill bit is changed into cylindrical form, a mud ditch is a square slot, the drill bit adopts the equal abrasion teeth distribution method, and an inner gage protecting teeth is radial teeth distribution. The penetration rate and the footage of the drill bit are both much higher than the drill bits used now, the footage of single drill bit can reach more than 100 m, and the core recovery can reach more than 98 percent.

Description

Artificial diamond core-extracting drill bit

The utility model relates to a kind of drilling well synthetic diamond core bit.

The problem that the on-the-spot at present synthetic diamond core bit that uses exists is: the drill bit rate of penetration is low, and single footage per bit is not high, and average drilling depth is lower than 40 meters, and coring recovery rate is low, processing difficulties, cost height.These problems mainly are because the defective that exists on the drill bit structure causes.The on-the-spot synthetic diamond core bit that uses is considered the chip removal problem, will cut a piece excision part, causes drill bit to produce in the cutting drilling process and impacts, and the diamond that quickens on the drill bit damages, thereby influences drilling depth and get the core effect.Cutting process cloth teeth such as drill bit employing, the actual use shows that this kind cloth tooth method is difficult to reach designing requirement.Gauge teeth is axial arranged in the drill bit, and bigger to the coring recovery rate influence, in addition, the drill bit endoporus is a blossom type, and mud ditch is round groove, and such structure difficulty of processing is bigger, thereby has increased the cost of production of drill bit.

The purpose of this utility model be to design a mechanism drilling speed and drilling depth height, coring recovery rate is good, the synthetic diamond core bit that cost is low.

The utility model is last, and two bodies are welded down, and the upper body is a cylinder mode, and an end of upper body is partly with screw thread at endoporus and cooperates with coring tool, the other end and the welding of drill bit lower body.The drill bit lower body is divided into cylinder and multiaspect cone two parts, cylindrical portions may and upper body welding, endoporus is a circular hole, the multiaspect cone generatrices is by two crossing buses of outer wimble fraction (being parallel to the cylinder bus), two crossing buses of top arc generatrix and inner cone (one parallel with cylinder endoporus bus) are formed, the polyhedral cone body portion has nine square mud ditch along the whole conical surface, conical section is divided into nine equal cutting pieces, it is the vee gutter that circular arc connects that the outer wimble fraction of each cutting piece has a top, has a mud hole to communicate with the drill bit endoporus at the top of each vee gutter.On each cutting piece, evenly be welded with the diamond cutting teeth along bus, the diamond axis is consistent with the normal orientation of cone generatrices, diamond on the Outer Taper bus straight line portion is outer gauge teeth, diamond on oblique line and the circular arc portion is a cutting teeth, diamond on the inner cone straight line portion is interior gauge teeth, and outer gauge teeth and interior gauge teeth are radial arrangement.

Advantage of the present utility model is:

(1) simple in structure, handling ease, cost is low.

(2) rate of penetration and footage per bit height, single footage per bit doubles many than the on-the-spot synthetic diamond core bit that uses at present, reach every drilling depth more than 100 meters.

(3) coring recovery rate reaches more than 98%.

Fig. 1 is a drill bit master pseudosection.

Fig. 2 is the drill bit right view.

In Fig. 1, (1) is the drill bit upper body, and (2) are the drill bit lower body, and (3) are interior gauge teeth,

(4) be cutting teeth, (5) are outer gauge teeth.

In Fig. 2, (6) are the cutting piece, and (7) are mud ditch, and (8) are the mud hole.

Claims

1, a kind of synthetic diamond core bit, the drill bit bus is made up of garden tube and multiaspect cone two parts, cone partly is divided into some cutting pieces by mud ditch, the outer wimble fraction of each cutting piece has the vee gutter that a top connects for the garden arc, the top of vee gutter has a mud hole to communicate with the drill bit endoporus, evenly be welded with the diamond cutting teeth at each cutting piece upper edge bus, it is characterized in that:

A, drill bit are welded by two bodies up and down;

B, drill bit endoporus are the hole, garden,

C, mud ditch are square groove;

Gauge teeth is a radial arrangement in d, the drill bit.