SOLID FOAMING AGENT FOR REMOVING LIQUID FROM WELL BOTTOM Russian patent published in 2004 - IPC

FIELD: oil and gas production. SUBSTANCE: invention is intended for removal of liquid with mineral salt content up to 200 g/l and content of gas condensate in mixture up to 50% from low-temperature well bottoms, preferably during late stage of deposit development. Solid foaming agent contains, wt %: nonionic surfactant OP-10 or OP-7 34.0-40.0, anionic surfactant: sulfonol 9.8-11.6, crystalline sulfamic acid 11.0-13.0, sodium, potassium, or calcium carbonate 4.5-6.5, and powdered lignosulfonate - the balance. Content of nonionic surfactant should be related to that of sulfonol as 3.45:1. EFFECT: enhanced efficiency of foaming and ejection of high-mineralized waters in presence of gas condensate from low-temperature bottoms of gas and gas condensate wells. 2 tbl, 5 ex