Research On Remaining Oil Characterization And Development Adjustment Technology Of Chang 8 Reservoir In L Area Of Huanjiang Oilfield

Area L of Huanjiang Oilfield is located in the Tianhuan depression area of the Ordos Basin.The main oil-producing layer is the Chang 8 oil layer of the Triassic Yanchang Formation,which is a typical low-permeability oil reservoir.The main development method is water injection.Since the reservoir was put into development in 2010,the reservoir has entered the middle of development,with a rapid decline in production and a severe situation for stable production.Therefore,it is necessary to clarify the distribution characteristics of the remaining oil in the reservoir,so as to adjust the development technical plan,which is of great significance to the subsequent development of the remaining oil in the oilfield.This thesis is mainly based on the geological data,core data,production performance data,etc.of the study area,combined with stratigraphic characteristics to classify the strata.The Chang 8 oil layer is divided into 5 small layers,and the structural analysis of each small layer is carried out,and the reservoirs are found.The layer structure has little control effect on the oil reservoir.Researching and analyzing the reservoir characteristics and sedimentary characteristics,it is found that the heterogeneity of the reservoir is strong,the degree of fracture development is high,the sedimentary type is delta front subfacies,the Chang 812 layer is the main force layer,and the thickness of the sand body Larger;through analysis and research on the reservoir pressure system,water flooding status,water cut change law,etc.,it is concluded that the current reservoir is facing development contradictions such as rapid water cut rise,difficulty in establishing a displacement system,and many low-yield and low-efficiency wells.By establishing the fine geological model and numerical simulation model of the Chang 8reservoir in the study area,the remaining oil distribution characteristics in the study area are finely portrayed and described,and the remaining oil distribution profile,distribution law and controlling factors are summarized.Finally,according to the remaining oil distribution characteristics and the main development contradictions in the study area,the reservoir engineering method and numerical simulation analysis method are used to study the development and adjustment technology of the area,including the optimization of development technology policies and single well control measures(including dynamic monitoring).,Oil and water wells refilling holes and re-drilling water injection wells,etc.)and the optimization and adjustment of the well pattern,further providing an effective basis for the subsequent development of the Chang 8 reservoir in the L area.