FROTH-FORMING COMPOSITION FOR HOLE DEVELOPMENT Russian patent published in 1996 - IPC

FIELD: oil and gas production industry. SUBSTANCE: froth-forming composition containing urea, alkaline or alkaline-earth metal nitrite, surface-active substance, water, foam-stabilizing agent (flotoreagent) and ammonium hydrodifluoride or hexafluorosilicate has water-soluble polymeric compounds - carboxymethycellulose or polyacrylamide as flotoreagent. Addition of water-soluble polymeric compounds to foam system improves foam property and its carrying out capability with regard to mesoimpurities, sand, asphalto-paraffin-resinous substances, corrosion products from drilling bottom hole on surface due to enhanced flotation foam forces. EFFECT: enhanced quality and property of foam.