The Study On Long 11 Well Area Late Stage Development Adjustment Of Qinglongtai Oilfield

Based on the formation correlation and integrative study on structure, reservoir and sedimentary features, the geological structure is accurately described. The reservoir is divided into 3 oil units, 16 sand units and 34 subunits, and the fan delta front is further divided sublaccustrine braided channel, debouch bar, interdistributary and abandoned channels and lagged channel subfacies. The reservoir is lithology-structural reservoir with light oil, the porosity and permeability is moderate with high shale content.In the paper, the development effect is evaluated. Through carrying out various work including the ultimate recovery prediction, total water cut evaluation, water consumption evaluation, water injectivity ratio analysis, water injection swept volume evaluation, oil reservoir pressure, current well pattern adaptability, injector and production active wells and reserve producing degree, it is believed that the overall water flooding in the area is in the second class development degree, and the dominant fault block zone is in the first development degree. Based on the production performance analysis, the subzone water out is studied, and several types of remaining oil distribution are summarized and adjustment plan is made for field execution.Through the study, the adjusting principles are determined in the fault block such as try to find the new area, re-develop the old area and adjust the displacement and profile and it is determined that the main producing zone I5 is the important adjusted target in the next step. In the newly found area, a total of 8 wells of different kinds are deployed, and stage recovery degree is predicted to be increased by 1.23%.