Baker Hughes Baker-Hughes-strasse-1 29221 Celle Lower Saxony Germany;
Baker Hughes Baker-Hughes-strasse-1 29221 Celle Lower Saxony Germany;
Universidade de Lisboa Instituto Superior Técnico CeFEMA Av.Rovisco Pais 1 1049-001 Lisbon Portugal;
Air sparging; gas extraction; mechanical stirring; mud logging; vacuum;