Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1992-02-05
1993-01-05
Britts, Ramon S.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175336, 175404, E21B 1004, E21B 1014
Patent
active
051762129
ABSTRACT:
A drill bit for drilling a hole in the ground, with cutting elements annular by cutting a core which, when it has reached a certain height, is continuously crushed by teeth on rolling cones. By combining these two processes, cutting and crushing, in this manner an improved drilling advancement is achieved as compared to separate use of these 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. The 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 element is improved due to the fact that the edge of the element is rounded with a small visible radius.
REFERENCES:
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Maurer et al., "High-Pressure Drilling", Journal of Petroleum Technology, Jul. 1973, pp. 851-859.
Britts Ramon S.
Tsay Frank S.
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