Research and application of separate layer steam injection technology

Severe heterogeneity universally existed in shallow layer of heavy oil reservoir and the differential steam ab- sorption occurred during the process of steam stimulation lead to high producing degree of high permeahility layers and low producing degree of middle-low permeability layers,which is greatly against oilfield development.In order to solve these problems,a separate layer steam in- jection technology has been developed.This technology can realize separate layer steam injection on one trip string and has the advantage of production string and separate layer steam injection combination,reducing the running and pulling operation for team injection string,and elimi nating the heat energy loss during the operation.The ap- plication results show that the technology is able to en- hance the producing level of reservoirs and ultimate oil re- covery as well.