Rotary drill bits and drilling tools having protective structures on longitudinally trailing surfaces
US8096373B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2009 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Oct 3, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/003
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary drill bit or other drilling tool for drilling or reaming through subterranean formation and comprising a body comprising a distal end and gage areas near a proximal end thereof and comprising longitudinally upward extensions of a plurality of blades or legs. A longitudinally trailing, radially inwardly extending surface is associated with at least some gage pads or legs at the longitudinally trailing ends thereof. Protective structures in the form of superabrasive elements comprising a plurality of thermally stable polycrystalline diamonds, or so-called “TSPs” (thermally stable products) are secured to a trailing surface of at least one gage pad. PDC elements may be employed in combination with the TSPs. Non-diamond structures may also be employed, in lieu of or in conjunction with diamond structures, particularly if drilling of ferrous metal casing components is contemplated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.