METHOD FOR CEMENTING CASING STRINGS Russian patent published in 1996 - IPC

FIELD: well drilling. SUBSTANCE: washing agent is removed from beyond string and in-string cavities before supplying binding mixtures. In- string space is overlapped along all cross section in nearby bottom area. Then binding mixtures are supplied in beyond string cavity by portions with each subsequent portion supplied after solidification previous portion. Binding mixtures with fillers are supplied inside absorbing strata. During all the process when binding agents are supplied in- string space is periodically filled with fluid. EFFECT: higher reliability in well development. 7 dwg