SOLID FOAMING AGENT FOR REMOVAL OF FLUID FROM GAS AND GAS-CONDENSATE WELLS Russian patent published in 1997 - IPC

FIELD: technology of operation of gas deposits; may be used in removal of formation fluid from gas and gas-condensate wells. SUBSTANCE: loaded in mixer are 1.5 g(25 wt.%) - 3.42 g(57 wt.%) of nonionic surfactant; 1.5 g(25 wt.%) - 2.88 g(48 wt.%) of complex salt of urea with acid and 1.08 g(18.%) - 1.62 g(27 wt.%) of nitrites of alkali or alkali-earth metals. In this case, taken for 1 wt.% of nitrite of alkali or alkali-earth metals is 1.4-1.8 wt.% of complex salt of urea with acid. Formed rod weights 6 g. Rod is introduced into well through lubricator. Density of foam generating agent is 1010-1030 kg/cu. m. EFFECT: higher efficiency of removal of water-condensate mixture with content of gas condensate up to 50 vol.%, sodium salts up to 8.0 wt.%; soluble salts of calcium and magnesium up to 1.4 wt.% from deep development wells having sump due to increased amount of liberating gas.