METHOD OF PERFORMING REPAIR JOBS IN DEVELOPMENT WELL Russian patent published in 1998 - IPC

FIELD: oil producing industry in elimination of leakage of casing strings. SUBSTANCE: method includes injection into well of viscoelastic compound and cement slurry through tubing string. This injection is carried out with well annular space opened. Vibroelastic compound is located below the lower boundary of leaky part of casing string. Prior to injection of cement slurry, tubing string is lifted to position its end at the level of leaky part of casing string. After injection tubing string is also lifted above upper boundary of cement slurry. Prior to injection of cement slurry, the process is let stand. Then displacing fluid is injected with well annular space closed. Amount of this fluid equals to 1.5 volumes of part of tubing string which was immersed in cement slurry. EFFECT: higher efficiency. 3 cl, 1 dwg