| abstract |
The invention is directed to stable interlaced water soluble expandable polymers and methods for making them. More particularly, the invention relates to a composition comprising expandable polymeric particles having stable anionic sites and interlacing and stable interlacing, the particle mixed with a fluid and a cationic interleaver that is capable of additionally interlacing the particle to degradation. of the labile interlacer and the exposure of the anionic sites to form a gel. A particularly important use is as an injection fluid in oil production, where the expandable polymer particles are injected into the target zone and when heat and / or the appropriate pH of the target zone causes degradation of the entangler labile and the particle expands, the cationic interlacer entwines the polymer to form a gel, thereby deriving water to regions of lower permeability and improving oil recovery. |