New method of water control combining oil-water simultaneous production with water shutoff in clastic bottom-water reservoirs,Tahe Oil Field

In elastic bottom-water reservoirs of the Tahe Oil Field, water invasions(water cones and break-throughs) are problems difficult to solve.A new method of water control combining oil-water simultaneousproduction with water shutoff was proposed.First,we opened the upper oil-bearing layer.Second,we perfora-ted into the bottom water layer.Oil and water were produced simultaneously,changing the direction and speedof water cones around well bore.Based on geologic characteristics and water breakthroughs,we usedplugging agent to shut water off selectively.Combining these two methods,we controlled water inva-sions and Yalsed Oil-water interface evenly and slowly.Feasibility of the new method was discussedfrom accumulation and technique aspects,and the key factors were pointed out.