Study On Fine Characterization And Effective Production Technology Of Single Sand Body In Ultra-low Permeability Reservoir

The Chang 8 oil reservoir in Block L of Huanjiang Oilfield has entered the mid-stage of development,and has gradually exposed prominent contradictions such as prominent injection-production contradictions,accelerated water cut,and increased low-yield and low-efficiency wells.The development potential of oil-water wells has not been fully utilized,and injection-production development policies need to be further improved.optimization.In this paper,the stratigraphic division and comparison of the Chang 8 oil reservoir were carried out,and the sedimentary microfacies characteristics of the Chang 8 oil reservoir were studied.On this basis,the superimposed relationship of the single sand body was clarified,and the fine description of the single sand body and the sand body were completed.Research on the impact of superposition relationship on water injection development;according to the analysis of development data over the years,the study of water-cut changes and the characteristics of water flooding changes,the effect of water flooding development is evaluated.Based on the fine single sand body description,the corresponding relationship between injection and production is studied.Through analysis The production dynamic characteristics of Chang 8 reservoir laid the foundation for the next step to complete the effective production technology of single sand body and finally completed the effective production technology of single sand body.Acquired the following knowledge:The vertical stacking relationship of the single sand body of Chang 8 reservoir in the L area mainly includes three types:separation,stacking and cut stacking.The stacking relationship in the lateral direction mainly includes three types:isolated,butt and side cutting.The impact of single sand body superposition relationship on water injection development is mainly reflected in the difference in the degree of water driving and the impact on the effective time of water injection.The injection-production non-corresponding wells of Chang8₁^21-2single sand body are widely distributed,and the corresponding relationship between injection-production is poor,and the injection-production correspondence of Chang 8₁^21-1is good.Through the imperfect well pattern area,injection without production,without injection with production,injection without production,and without injection without production,measures such as well compensation,hole compensation,separate injection and repeated fracturing,and acidification deblocking were implemented.Stable and increased production in the research area provides a strong guarantee.