Abstract: In the recent three years, Operators Group Corp.has successfully conducted sidetracking operations in the ?244.5mm casing in a hole inclination of about 33°, by applying the steerable drilling technology.Despite the limited floor space and rig load, steerable drills were used for directional drilling and hole trajectory controlling.Furthermore, based on the application of such advanced tools and technologies as AUTOTRAK, MWD and LWD, the torque and friction prediction and evaluation technology for extended reach drilling was also used.Two difficult deep horizontal wells have been sidetracked successfully to date.