Recovering assisted hydrocarbon contained in geological tank, comprises injecting sweeping fluid into tank, collecting effluent comprising hydrocarbons, separating aqueous fluid from effluent, and injecting degradation agent into fluid

摘要

The method comprises injecting a sweeping fluid including a polymer into a geological tank (1) to move hydrocarbons towards a producing well (4), collecting a production effluent comprising hydrocarbons by the producing well, separating the aqueous fluid from the effluent, and injecting a polymeric degradation agent into the aqueous fluid. The injection of the degradation agent is carried out at a top of the producing well and before a primary stage of hydrocarbons/water separation. A concentration of the degradation agent in the aqueous fluid is 1-2000 parts per million. The method comprises injecting a sweeping fluid including a polymer into a geological tank (1) to move hydrocarbons towards a producing well (4), collecting a production effluent comprising hydrocarbons by the producing well, separating the aqueous fluid from the effluent, and injecting a polymeric degradation agent into the aqueous fluid. The injection of the degradation agent is carried out at a top of the producing well and before a primary stage of hydrocarbons/water separation. The degradation agent is an oxidizing compound. A concentration of the degradation agent in the aqueous fluid is 1-2000 parts per million. The polymer is natural polymers and synthetic polymers. A molar mass of the polymer is 0.5x 10 6>-30x 10 6> g/mole. The method further comprises injecting an anti-corrosion agent mixed with the degradation agent into the effluent.