Title:
ROTARY BALLING BIT FOR BALLING DEEP WELL
Document Type and Number:
Japanese Patent JPS57100288
Kind Code:
A
Abstract:
A rotary drill bit for deep-well drilling, consisting of a body member 1, a threaded pin 2, for connection to a drilling string or the like rotary drive and a head which is provided with cutting elements which extend from the base region of the head into its central region and are combined, in groups in the form of rows or strips, as cutters 3, 4 projecting beyond the outer periphery of the bit, said cutting elements comprising both cutting elements 6 which have only one plane cutting face and cutting elements 5 with a divided cutting face the component faces of the divided cutting face being at a mutual angle to one another of less than 180 DEG .
Inventors:
RAINAA YURUGENSU
Application Number:
JP16731281A
Publication Date:
June 22, 1982
Filing Date:
October 21, 1981
Export Citation:
Assignee:
CHRISTENSEN INC
International Classes:
E21B10/42; E21B10/43; E21B10/46; E21B10/56; E21B10/567; (IPC1-7): E21B10/08
Domestic Patent References:
| JPS53135802A | 1978-11-27 |
Foreign References:
| US4202419A | 1980-05-13 | |||
| US4143902A | 1979-03-13 | |||
| US4076318A | 1978-02-28 |