Research On Periodic Water Injection Method Of Block 7E416-67

7E 416-67 block,located in Zhaoyuan County,Daqing,Heilongjiang Province,belongs to the oan oilfield and is located in the central depression of the northern Songliao Basin,which is the intersection of three two grade structural belts in Daqing Changyuan,the three Zhaozhao sag and gulong sag.The target development segment is the Putaohua oil layer of the lower part of the lower Cretaceous Yao Jia formation.The area has an area of 63km2,which consists of 439 wells,146 wells,an average thickness of 1.2m and an effective thickness of 0.8m,which is a fractured low permeability oil field.In view of the uneven effect of oil well in this block,the obvious directional property of water and the low output of oil wells,the cyclic water injection mode is studied in this block.In this paper,Petrel software is used to establish geological models for the fault,layer,sedimentary facies,effective thickness,porosity,permeability,saturation and fracture of the block.In view of the geological characteristics of double porosity and double porosity in the block,numerical simulation is carried out with the simulated horizon of 2 times the real horizon.Starting from the results of the geological model established by Petrel,the grid properties of the coarse-grained are simulated through Eclipse.According to the actual production situation,the reservoir parameters and dynamic data of the block are simulated,and the historical stratified water injection method,geological reserves,water content,liquid production,injection amount,accumulative oil production,and single well dynamic parameters are fitted to ensure the accuracy of the numerical simulation.By using the established number model,the optimal water injection scheme is selected and the optimal water injection scheme is determined through the three aspects of the horizontal well network combination mode,the water injection cycle and the water injection intensity,and the experiment is carried out in the field,and the input and output are 0.58 higher than that of the input and output.In this paper,the study of cyclic water injection in this block has certain guiding significance for the choice of cyclic water injection mode in fractured low-permeability oilfield.