The present invention provides improved foamed well cement slurries, additives and methods. The additives, which foam and stabilize a cement slurry containing fresh water or salt water, are basically comprised of a mixture of an ethoxylated alcohol ether sulfate surfactant, an alkyl or alkene amidopropyl...http://www.google.es/patents/US6063738?utm_source=gb-gplus-sharePatente US6063738 - Foamed well cement slurries, additives and methods
Foamed well cement slurries, additives and methods
