Conclusions GreenZyme® can effectively move oil from the surface of grains of sandstone, provided that these hydrocarbons are above the point of fluidity. The mechanism of operation is a reversal of wettability, making grains strongly wet by water, thus releasing oil. The product diluted to 4% v/v showed satisfactory performance in sand contaminated with heavy oil, both paraffinic and asphaltenic. bto logo Oil and Water GreenZyme 4% GreenZyme® in the Lab.. Greenzyme EOR at Work