Combination drill bit

Details Combination drill bit Combination drill bit

E - Fixed Constructions

21

B

255/71

E21B 10/02 (2006.01) E21B 10/04 (2006.01) E21B 10/48 (2006.01) E21B 10/56 (2006.01) E21B 10/60 (2006.01)

Patent

CA 2008567

ABSTRACT OF THE DISCLOSURE A combination drill bit A drill bit for drilling a hole in the ground, with cutting elements annular-cutting a core which when it has reached a certain height, is continuously crushed by teeth on rolling cones. By combining said two processes, cutting and crushing, in this manner an improved drilling advancement is achieved as compared to separate use of said processes. The cutting elements show relatively small variations as to radial positioning, which renders it possible to find a common approximately optimal rotational speed of said elements. Core is weak and may be drilled out relatively easily by the aid of crushing, as compared to drilling pure holes. This is due to the fact that the core geometry causes a more efficient growth of fractures for each tooth penetration, and that the core, due to annular cutting is free from radial tensions from the surrounding rock formations. In order to increase the life of the PDC cutting element the mechanical strength of said elemen is improved due to the fact that the edge of said element is rounded with a small visible radius.

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