Roller cone bit having gland for full seal capture
US10494873B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2017 |
| Grant date | Dec 3, 2019 |
| Priority date | — |
| Expiry date | Mar 15, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bit for downhole use includes: a leg having a mid shirttail and a lower bearing shaft; a roller cone rotatably mounted to the bearing shaft; a row of gage cutters, a row of inner cutters, and a nose cutter, each cutter mounted to or formed on the roller cone; and a gland formed in an inner surface of the roller cone. The gland has: a face; an outer surface; a fillet connected to the outer surface; a corner connecting the face and the outer surface; and an elastomeric o-ring captured in the gland and squeezed between the outer surface and the bearing shaft. A radius of the fillet is greater than one-half of a cross-sectional diameter of the o-ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.