Purifying treatment for effluents of mineral oil drillings
US4035289A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1975 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Nov 25, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Purification of the effluents from mineral oil drillings, carried out on land, for permitting the discharge of the residual waters into the natural surroundings. First, microorganisms are cultivated on a volume of the effluent, in order to make them capable of digesting the impurities of the effluent. The culture, thus obtained, is then developed in the mass of the effluent to be treated until the BOD is reduced to the required limit. This treatment is preferably followed by a flocculation with chemical agents in the known manner. This anti-pollution treatment permits the regulations in force to be applied in all locations where the drillings are undertaken, whatever may be the auxiliary fluids used in the drilling operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.