Study on exploiting the remaining oil of thick pay zone with positive rhythm by horizontal wells

Compared with vertical wells horizontal wells has the advantages of shortening distance between wells,extending well drainage area increasing critical coning flux controlling the injection fluid and improving oil displacement efficiency.When fluid offtake is the same horizontal wells can reduce intensity of produced fluid and increase water cut rate.There is abundant remaining oil in the top of reservoir of fluvial facies,it was exploited using the technique of horizontal well and ultimate water displacement recovery increased by 14% compared with vertical wells.