Drilling fluids having reduced sag potential and related methods
US8569213B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2013 |
| Grant date | Oct 29, 2013 |
| Priority date | — |
| Expiry date | Jan 15, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Invert emulsion drilling fluids that have extended emulsion stability and reduced sag potential can be realized through incorporation of colloidal particles therein. The invert emulsion drilling fluids can be free of organophilic clays. The organophilic clay-free drilling fluids can comprise: an oleaginous fluid continuous phase; an aqueous fluid internal phase; a surfactant; a weighting agent; and a plurality of colloidal particles, the colloidal particles comprising fibrous colloidal particles and at least one other type of colloidal particle; wherein at least a portion of the plurality of colloidal particles interact with the surfactant to form an associative supporting structure that inhibits sag of the weighting agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.