METHOD OF ISOLATING LOST CIRCULATION ZONES IN DRILLED WELL

摘要

FIELD: drilling of oil and gas wells, in particular, isolation of lost circulation zones in drilled wells. SUBSTANCE: method includes successive supply to circulating drilling mud of fringes of carbonate dust and acid solution. Prior to supply of acid solution fringe supplied to drilling mud is fringe of foam-generating surfactant. In this case, fringes are supplied in the same volumes. EFFECT: higher efficiency due to increased stability of isolating gas-liquid barrier. 2 cl, 1 tblv