Bi-center bit and drilling tools with enhanced hydraulics
US10927608B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2018 |
| Grant date | Feb 23, 2021 |
| Priority date | — |
| Expiry date | Mar 9, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling tool includes a pilot bit coupled to an eccentric reamer that has a reaming side and a stabilizing side. A fluid passageway extends between the reamer and the pilot bit, and the tool includes at least one upwardly-directed nozzle in fluid communication with the fluid passageway and positioned on the stabilizing side of the reamer. The reamer may include a plurality of angularly spaced blades on the reaming side that radially extend a first distance, the reamer blades being disposed within a first arcuate segment defined by the two most distant reamer blades. One or more stabilizing blades extend a second distance that is less than the first distance, the stabilization blades being disposed within a second arcuate segment defined by the two most distant reamer blades and that has the angular measure equal to 360 degrees minus the first arcuate segment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.