FIELD: crude oil treatment.
SUBSTANCE: oil emulsion is preliminarily separated from drainage water and, after addition of demulsifier, oil desalting process is carried out by washing moving emulsion under dispersing conditions with a washing fluid in at least two steps. Volume of washing fluid added in the first desalting step is larger than that in the second step by a factor of 2.0-2.5. Washing fluid is notably 3-10% aqueous sodium nitrate solution, which is preheated before addition to at least 45°C in both desalting steps. In the first step, oil is subjected to hot settling preferably for 2 h and, in the second step, 3 h. Demulsifier utilized is based on oil-soluble surfactants added in amounts 25 to 55 g/t.
EFFECT: reduced consumption of demulsifier at higher degree of desalting, in particular for oils with high level of chlorides.
7 cl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF CLEANING APPARATUS IN COURSE OF PETROLEUM DEWATERING AND DESALTING | 0 |
|
SU653288A1 |
| METHOD OF DESALTING AND DEHYDRATING HEAVY VISCOUS CRUDE OIL AND TRAPPED PETROLEUM PRODUCT | 2002 |
|
RU2230771C2 |
| METHOD OF CRUDE OIL DESALTING | 0 |
|
SU1666520A1 |
| UNIT FOR PROCESSING RESISTANT, HIGH-VISCOSITY OIL EMULSIONS | 0 |
|
SU1761187A1 |
| 0 |
|
SU445681A1 | |
| PETROLEUM PRETREATMENT INSTALLATION | 0 |
|
SU1542565A1 |
| CRUDE OIL COLLECTION AND TREATMENT METHOD | 1999 |
|
RU2153382C1 |
| METHOD OF DEWATERING AND DEMINERALIZING HIGH-VISCOSITY CRUDE OIL | 0 |
|
SU1715824A1 |
| DEVICE FOR HIGH VISCOUS OILS PREPARING | 0 |
|
SU1761191A1 |
| CRUDE OIL TREATMENT PLANT | 2005 |
|
RU2295996C1 |
