Abstract: YJB oilfield is a mature oilfield that has been put into production since the end of 1980s. Errors of borehole deviation data are relatively large due to the constraints of historical development conditions and technological conditions. As a result, the structures have not been materialized in this oilfield and development effects are not ideal. Gyroscopic survey technology is used to correct well trajectories and a geological basis is provided for highly effective production potential tapping of the remaining oil in this oilfield. Application effects are very good and it can be used as a reference for development of similar oilfields.