Abstract: A novel casing mending technique,liner packing technology is developed to solve the problem of increasing casing damaged holes in the thick oil block of Huanxiling Oilfield.This technology is easy for operation,suitable for mending casing damaged holes of any depth,and is very practical for mending casings of long damaging span with multiple damaging points.Compared with such measures as conventional sidetracking,casing patching and redrilling,the liner cementing technology has wider application range and can cut down the operation cost.This technology was tested in three wells with satisfactory results achieved.