Patent · US Active

Central cutting region of a drilling head assembly

US8418784B2 · kind B2 · utility

1Cited by

129References

14Claims

0Family size

Inventors

David R. Hall · Provo, US
Thomas Morris · Spanish Fork, US

Key dates

Filing date	May 11, 2010
Grant date	Apr 16, 2013
Priority date	—
Expiry date	Jun 3, 2031

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/44
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In one aspect of the invention, a drilling assembly comprises a head located on a rotational axis of the assembly and comprises at least one head element. At least one blade extends distally from the head. A plurality of blade degradation elements are rotationally supported on the blade. Each degradation element comprises an attack angle that affects the penetration rate of each degradation element and a laterally offset angle that primarily affects the rotational rate of each degradation element within their holders. The drilling assembly comprises a central cutting region. The blade degradation elements within the central cutting region form an attack angle of 15 to 20 degrees with the rotational axis of the drilling assembly.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.