Research On Geological Characteristics And Water Injection Development Effect Of Xinzhao Oilfield

In recent years,with the development of oilfields in the middle and late stages,early high-quality reservoirs have been mined,and low-permeability oil and gas fields that were not originally included in oilfield commercial development have gradually entered the field of vision.Xinzhao Oilfield is a typical low-permeability fractured abnormal high-pressure oil and gas field.After more than ten years of development,the development of reservoir fractures in the block has caused multi-layered multi-directional seepage of oil wells,prominent contradictions between layers and planes,and rapid production deceleration.The contradiction in the adjustment of oilfield water injection is more and more difficult.To solve the contradictions in development,control the degression and find a way out.At the same time,it also provides new and efficient development for relatively efficient development of micro-fractures in the low-and ultra-low-permeability reservoirs outside the western part of Daqing Oilfield.Ideas.For this purpose,we start with the geological characteristics of the reservoir,consult the original stratigraphic data of the Xinzhao Oilfield,and collect information on the stratigraphic profile and structural features,and combine the dynamic and static data to finely describe the Putaohua oil layer of the main oil production zone in Xinzhao Oilfield and refine the oil content in the Xinzhao Oilfield.Reservoir geology characteristics provide the theoretical basis for the next water injection development effect.Based on the passive micro-seismic test results and the analysis of dynamic and static data,the development of reservoirs in Xinzhao Oilfield was studied.The main direction of the main cracks in Xinzhao Oilfield was determined by east-west direction,through the direction of oil-well seeing water.The connection method in the Luan oilfield is a composite structure of cracks,matrix and cracks.Identify the favorable and adverse factors affecting crack development.The distribution of remaining oil in the reservoir is clearly defined,and the recoverable reserves are clarified on the dynamic and static data analysis.The development effects of the blocks in Xinzhao Oilfield over the years are compared,the reasons for differentiation are found,and the next steps are identified.In view of the development of reservoir fractures,the high-intensity waterflooding results in rapid recovery of oil wells in oilfields.We have conducted studies to determine the maximum water injection volume and the reasonable value of water injection pressure,and conducted linear waterflooding experiments for water control and well group production,including microbial injection,profile control,and pressure control.A series of experimental studies,such as splitting,have yielded the changes in the production fluid/oil recovery index,the water absorption index,and the starting pressure variation of water injection development in Xinzhao Oilfield.Finally,the main stratum and non-main strata in Xinzhao Oilfield will be used in a balanced manner to improve the oilfield development effect.