Invert drilling fluids and methods of drilling boreholes
US7547663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2006 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | Dec 5, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Methods for drilling, running casing in, and/or cementing a borehole in a subterranean formation without significant loss of drilling fluid are disclosed, as well as compositions for use in such methods. The methods employ drilling fluids comprising fragile gels or having fragile gel behavior and providing superior oil mud rheology and overall performance. The fluids are especially advantageous for use in offshore wells because the fluids exhibit minimal differences between downhole equivalent circulating densities and surface densities notwithstanding differences in drilling or penetration rates. When an ester and isomerized olefin blend is used for the base of the fluids, the fluids make environmentally acceptable and regulatory compliant invert emulsion drilling fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.