Application case of casing subsidy Technology

Well example 1: the RTTS packer verified that the 7in casing leakage point of c-xx well in offshore oil field is between 743.8m-750.4m, the displacement is 25.3m3/h, and the pressure cannot rise. It is highly possible to judge that there is a leakage point, and the position is at the casing coupling depth of 746.62m. The casing electrical logging shows that the casing of 737-755.5m well section has ellipse, and the ellipse of 745-749.5m is the most serious. The 746-747m casing is abnormal and some azimuth signals are lost. 20Cr material is lowered with high pressure removable casing subsidy technology, φ 152mm × 5mm subsidy pipe is 13m long, subsidy position: 737.3m-750.3m, pressure test after subsidy: 17Mpa, 30min, no leakage, well completion.