Abstract: There is still some potential to dig the remaining oils when the oil reservoir is at high water cut stage.But there are three risks in the production of remaining oil:(1) How to avoid the risk of drilling into water flooded area to produce remaining oils;(2) How to determine the landing space of horizontal well in the area with low well spacing density;(3) How to improve the penetrated rate of reservoir when the footage of horizontal well was restricted in high water cut area.The technology of PeriScope LWD has been used in order to decrease the risk in digging the potentials of remaining oils,and the sand top has been predicted successfully in remaining oil area.The horizontal well which is used to produce oils was landed successfully.It is proved that the technology of PeriScope LWD is a new method to digging the potentials of remaining oils in reservoirs with high water cut.