Ultra-low friction coatings for drill stem assemblies
US8561707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2011 |
| Grant date | Oct 22, 2013 |
| Priority date | — |
| Expiry date | Jan 31, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Provided are drill stem assemblies with ultra-low friction coatings for subterraneous drilling operations. In one form, the coated drill stem assemblies for subterraneous rotary drilling operations include a body assembly with an exposed outer surface including a drill string coupled to a bottom hole assembly, a coiled tubing coupled to a bottom hole assembly, or a casing string coupled to a bottom hole assembly and an ultra-low friction coating on at least a portion of the exposed outer surface of the body assembly, hardbanding on at least a portion of the exposed outer surface of the body assembly, an ultra-low friction coating on at least a portion of the hardbanding, wherein the ultra-low friction coating comprises one or more ultra-low friction layers, and one or more buttering layers interposed between the hardbanding and the ultra-low friction coating. The coated drill stem assemblies disclosed herein provide for reduced friction, vibration (stick-slip and torsional), abrasion, and wear during straight hole or directional drilling to allow for improved rates of penetration and enable ultra-extended reach drilling with existing top drives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.