Drilling fluids, drilling fluids additives and methods useful for limiting tar sands accretion on metal surfaces
US7081438B2 · kind B2 · utility
47Cited by
16References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 2003 |
| Grant date | Jul 25, 2006 |
| Priority date | — |
| Expiry date | Mar 6, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Fluids useful in oil well drilling operations are described. The fluids comprise standard viscosifying and fluid loss control additives along with phosphonates or phosphate esters of organic ligands. The addition of the phosphonates or phosphate esters at effective concentrations prevents the adherence of heavy oil and heavy oil laden drill cuttings to drill pipe strings and well bore casings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.