Gas production can be increased by injecting soap into the ground. This is the conclusion of Dr ir. Dries van Nimwegen (Applied Sciences), who defended his dissertation entitled The Effect of Surfactants on Gas-Liquid Pipe Flows on 15 June. The research has not gone unnoticed. Effective immediately, the Nederlandse Aardolie Maatschappij BV (NAM) is planning to inject soap into the gas-production wells in the North Sea. They hope that this will increase production by between 5% and 15%. These wells have produced less than expected, as the pressure has decreased over the years. Injecting soap will make the water effervescent, bringing gas along with it as it rises to the surface.