Salt-free invert emulsion drilling fluids and methods of drilling boreholes
US10030189B2 · kind B2 · utility
7Cited by
7References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 4, 2012 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | Dec 20, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An invert emulsion drilling fluid, and a method for the use thereof in drilling wellbores, with good rheological properties at high temperatures and pressures. One embodiment of the drilling fluids is free of organophilic clays and lignites, free of calcium chloride, and comprises glycerol in the internal phase, and a suspension agent comprising a combination of a fatty dimer diamine and a short chain acid, such as citric acid. In one embodiment, the base oil for the emulsion is a paraffin and/or mineral oil. The drilling fluids provide good rheological properties including good suspension of drill cuttings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.