Surfactants extract embedded oil from high-salt reservoirs

With controversy surrounding advance recovery methods such as hydraulic fracturing — or fracking — Jeff Harwell, Ben Shiau and Bruce Roberts from the University of Oklahoma’s (OU) Institute for Applied Surfactant Research have formulated an environmentally sound compound that increases oil flow in previously pumped reservoirs.

By using a surfactant that decreases the surface tension, oil is released from the rock so it can move with the injected water and be pushed to the production wells.

Secondary recovery methods, such as water flooding and fracking, are used to recover oil left behind by previously pumped reservoirs. The methods drive trapped oil toward the drill hole, but when the injected water reaches the production wells, most of the oil remains trapped in the rock.

‘Our surfactants replace the crude oil within the rock with harmless compounds such as brine that maintain the integrity of the rock formation,’ Harwell said in a statement. ‘The ingredients we use are in things that people use every day to bathe, brush their teeth and wash their car. The chemicals we inject are not near the threat or hazard level of the compounds in the oil we are removing from the reservoir.’