| 摘要 |
<p>The method comprises extracting a water production flow (5) from an underground formation, separating the production flow in a hydrocarbon fraction and an aqueous fraction from water production, and reintroducing an water injection into the underground formation, where: a part of the water injection is a filtrate obtained by contacting, in a direct osmosis unit (2), both sides of an osmosis membrane of a part of the production water; and sea water has an osmotic pressure that is lower than the pressure of the production water and includes an undesirable aqueous solution. The method comprises extracting a water production flow (5) from an underground formation, separating the production flow in a hydrocarbon fraction and an aqueous fraction from water production, and reintroducing an water injection into the underground formation, where: a part of the water injection is a filtrate obtained by contacting, in a direct osmosis unit (2), both sides of an osmosis membrane of a part of the production water; and sea water has an osmotic pressure that is lower than the pressure of the production water and includes an undesirable aqueous solution. The water having the osmotic pressure that is lower than the pressure of the production water is produced from aquifers. The undesirable aqueous solution is an organic molecule to cause environmental impact in the event of injection. The method further comprises pretreating production water in a first pretreating unit (3) before introducing the production water in the direct osmosis unit, and pretreating water having the osmotic pressure that is lower than the osmotic pressure of the production water in a second preprocessing unit (4) before introducing it into the direct osmosis unit. The first and second pretreatment units are identical and comprise an ultrafiltration unit. The concentration of sulfate in production water introduced in the direct osmosis unit is 0-100 mg/l.</p> |
