A Effect Evaluation Of Advance Water Injection In 30,000 Tons Test Area Of Weibei Shallow Reservoirs

Low permeability oilfield onshore proven oil reserves accounted for 26.1% of the total proven reserves,but the efficient development of low permeability reservoirs is still a world-class problem.Weibei long 3 shallow low permeability sandstone reservoir was featured with low formation pressure and strong heterogeneity and fractures.It had the characteristic of the large differences in moisture content and well productivity on a plane and faster production decline.The water injection was needed to complement formation energy for the establishment of effective displacement pressure system to enhanced oil recovery.Therefore,the depth of water injection development effect evaluation of the test area,is of great significance for the development and adjustment of the development of science and technology policy,which also had a certain significance for the efficient development of similar reservoirs.Weibei long 3 tight low permeability sandstone reservoirs water drive for the study in this paper.based on the reservoir geology and development of the situation on the fully integrated production data and using numerical simulation conducted research.The tight fractured reservoir waterflooding process of moving production features was cleared.The movement of water was described;The water injection development effect evaluation carried out to optimize the waterflood technology policy and proposed suggestion.Main results and knowledge attained are as follow:(1)An aqueous differences had a greatest impact on oil production capacity.Oil production capacity of natural fractures showed a good linear relationship when a certain moisture content.(2)According to the comprehensive water content,the establishment of well water level standards.When water containing well developed exponentially daily oil production to decline,with high and ultra-high-containing wells without the law of diminishing wells.(3)Five rectangular well filling can adapt to the changing orientation of natural fractures dense low permeability reservoir waterflood development.(4)In the area of encryption with less fracture inverted nine diamond well can better improve the degree of recovery.(5)When the number of sand within the target layer is greater than four and the total thickness of the sand layer is not less than 24 meters and poor interlayer permeability was not less than 2,the reservoir can be layered water injection.