| The Jurassic reservoir in the Luo 257 well area of Jiyuan Oilfield is a typical representative of low permeability reservoir,and its edge and bottom water is more developed.After years of water injection development,there are such below development problems: rapid increase in water content,flooded well to continue increasing,big loss of production capacity,low reserve use degree of water flooding,poor adaptability of well pattern and low level of formation pressure and so on.Based on the study of fine geology with the above problems,it takes a research to analyze the development dynamic of reservoir and law of water rise of production wells,and to determine the water source of high water wells combined with the production dynamic data.Also,the causes of water well are analyzed in many ways to be identified as edge water,bottom water,injected water and well pattern.The development effect of water flooding in the well area and the level of water injection and formation energy conservation are evaluated.Reservoir engineering,mine statistics,numerical simulation and other methods are used to determine a reasonable development of technical policies,including bottom water development and non-development zone of reasonable single well production,oil production speed,injection pressure system and injection-production ratio.Based on the results of numerical simulation of reservoirs and residual oil saturation and formation pressure distribution,it proposes production stabilization countermeasure at Luo 257 well area,including controlling high water cut wells and low production wells,and exchanging diamond shaped pattern of reverse nine points for the row of water injection.The results show that the countermeasures increase oil by 65,000 tons,enhance oil recovery rate of 2.3%,improve the production of well area,slow down the water cut,eventually provide decision-making basis for similar reservoir development. |
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