Materials and methods for recovering oil from oil sands
The present invention provides environmentally-friendly compositions and methods for recovering oil from oil sands. The present invention can also be used for reducing the viscosity and/or increasing the API gravity of oil. In specific embodiments, the invention utilizes compositions comprising biochemical-producing microorganisms and microbial growth by-products, such as biosurfactants, as well as cavitation, to enhance oil recovery.
1. A method for enhancing oil recovery from oil sands or from a formation containing oil sands, wherein the method comprises applying a composition comprising a glycolipid selected from sophorolipids, rhamnolipids and mannosylerythritol lipids, and a Starmerella bombicola culture, said Starmerella bombicola culture comprising no living microorganisms, to the oil sands or to the formation containing oil sands, wherein the application of the composition causes oil to detach from the oil sands; and
recovering the detached oil from the oil sands or from the formation.
2. The method of claim 1 , wherein the detached oil is heavy oil or bitumen.
3. The method of claim 1 , wherein the composition is contacted with oil sands that have been mined from the earth.
4. The method of claim 1 , wherein applying the composition comprises injecting the composition into a formation containing oil sands.
5. The method of claim 1 , wherein the glycolipids are selected from sophorolipids and mannosylerythritol lipids.
6. The method of claim 5 , wherein the concentration of sophorolipids and/or mannosylerythritol lipids is from 0.1% to 10.0%.
7. The method of claim 1 , wherein the oil sands are further subjected to cavitation after applying the composition.