Process using gellan as a filtrate reducer for water-based drilling fluids
US5744428A · kind A · utility
6Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/514
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for controlling the permeability of the walls of the geologic formations drilled. The circulating drilling fluid includes a determined amount of gellan used as a filtrate reducer. In the process, the viscosity of the fluid is mainly controlled by polymers, such as xanthan, scleroglucan or wellan. The invention further relates to a drilling fluid including gellan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.