Microbial products and their use in bioremediation and to remove paraffin and other contaminating substances from oil and gas production and processing equipment
The subject invention provides microbe-based products, as well as their use in simultaneously enhancing oil recovery from an oil well while efficiently removing contaminating compositions such as biofilm, scale, paraffin, and/or asphaltenes from oil production equipment and oil-bearing formations. The subject invention can also be used to disperse paraffin and asphaltene precipitates, and to reduce the viscosity of heavy crude oil. The subject invention further provides materials and methods for bioremediation of hydrocarbon-contaminated sites.
1. A method for softening, liquefying and/or removing paraffin and/or asphaltene deposits that have accumulated on a surface within an oilfield pipeline, storage tank, or tubing, wherein said method comprises applying to the pipeline, storage tank, or tubing a composition comprising
a biosurfactant blend comprising a sophorolipid and one or both of a rhamnolipid and a mannosylerythritol lipid; and
isopropyl alcohol in an amount from 2 ml/L to 100 ml/L,
wherein the biosurfactant blend further comprises a fermentation medium in which a biosurfactant-producing microorganism was cultivated as well as residual microbial cell matter, and wherein the composition does not comprise live microbes.
2. The method of claim 1 , which comprises applying 0.005-0.1 g/L sophorolipid biosurfactant and 2-50 ml/L isopropyl alcohol.
3. The method of claim 1 , wherein the asphaltene is dissolved in 12 hours or less.