Optimized enhanced oil recovery method with polymer preservation through sacrificial compound addition

摘要

The invention relates to an improved enhanced recovery method using polymers, wherein these polymers are preserved from mechanical degradation by adding an additive comprising sacrificial compounds. The sacrificial compounds are preferentially degraded instead of the active polymers, thus allowing optimized recovery of the oil in the petroleum reservoir. The sacrificial compounds can be polymers of same nature as the active polymers, but of higher molecular weight, or polymers of different nature having more fragile bonds. The sacrificial compound(s) is/are selected according to a lesser resistance to mechanical degradation, in comparison with the active polymers of the solution allowing enhanced recovery.

主权项

1. An enhanced oil recovery method comprising:
injecting a solution into an oil well, said solution comprising: an active polymer; and a sacrificial polymer comprising monomers of the active polymer and having a higher molecular mass than the active polymer, the sacrificial polymer present in a sufficient proportion with respect to the active polymers to limit the mechanical degradation of the active polymers.