FROTH-FORMING COMPOSITION FOR LIQUID REMOVAL FROM GAS HOLES Russian patent published in 1995 - IPC

FIELD: oil and gas mining industry. SUBSTANCE: composition has, wt.-% urea 17.2-17.9; alkaline or alkaline-earth metal nitrite 48.7-50.7; Lewis acid 25.3-26.3; foam stabilizing agent 0.2-1.4; froth-forming agent 0.7-2.2, and water the rest. Composition is used as cylindric briquettes on the basis of water-soluble cross-linking agents with filled density 1,8-2,0 g/cm³ for preparing foam, foam cements, polymer foam, alleviated drilling fluids, etc. EFFECT: increased froth-forming property, intensification of high-mineralized water and gas condensate removal from the gas hole. 3 cl, 8 tbl