WELL-KILLING FLUID Russian patent published in 1999 - IPC

FIELD: oil and gas production. SUBSTANCE: fluid contains, wt %: filtration-reduction reagents 0-1.5, isopropyl alcohol production waste from crude alcohol settlement and epurate rectification stages (foam former), 0.5-1,5; lime, 10-30; sodium, magnesium, and aluminum chlorides, 5-25; water, the balance. EFFECT: kept collector properties in productive strata when they are reopened or during the major repair period, and simplified fluid preparation procedure. 1 tbl