FROTH-FORMING COMPOSITION FOR HOLE DEVELOPMENT Russian patent published in 1995 - IPC

FIELD: oil mining industry. SUBSTANCE: froth-forming composition has, wt. -% urea 10.4-10.7; alkaline or alkaline-earth metal nitrite 59.0-60.7, Lewis acid 23.7-24.4; foam stabilizing agent 0.1-1.3; surface-active substance 0.4-0.8, and water the rest. Lewis acid promotes increase effectiveness at hole development due to its dissolving capability of carbonate and clay-containing rocks on bottom hole. Composition is prepared as cylindric briquettes on the basis of water-soluble cross-linking agents with filled density 1,8-2,0 g/cm³. EFFECT: decreased corrosion of equipment, increased effectiveness of hole development. 8 tbl