The Evaluation Of Remaining Oil Potential And Producing Condition Of Various Reservoirs In Sazhong Area

At present, Daqing oil field pays more and more attention to the recovery of second and third type reservoirs, because they have more remaining oil and greater potential. Therefore, the strengthening of study on remaining oil potential, producing condition and distribution of various reservoirs, has important significance for the old oil field to adjust the development plan and develop measures to increase production. Throughout the current science frontier related to the research of remaining oil, research of remaining oil potential and producing condition of various reservoirs in high water cut stage, guided by development geology and reservoir engineering and integrated application of geological, seismic, drilling, logging, coring and the development dynamics information, will become an inevitable trend.In this paper, take Sazhong development area of Daqing oilfield for example, consider the factors that affect the distribution of remaining oil first. Evaluate the remaining oil potential in the typical block by using multi-grade fuzzy comprehensive evaluation principle. And then analyze the relative permeability curves characters, the formation mechanisms and characteristics of the curve shape of various reservoirs. Establish the evaluation model of remaining oil potential combining with Welge equation and the law of water displacement curve B. Give the evaluation index system and analyze the producing condition and movable oil potential of various reservoirs according to the model established. Finally, in view of the current development status, in order to better tap the remaining oil in non major reservoirs, define reasonable driving pressure gradient of existing well pattern of the second and third type reservoirs combining with numerical simulation.Through the research in this paper, explore a set of comprehensive evaluation method with both development geology and reservoir engineering aimed at the evaluation of remaining oil potential in high water cut stage. Bond the qualitative "geological static" and quantitative "development dynamic" together to provide practical experience and theoretical basis for the effective water flooding development of sandstone oil field and the research of the distribution of remaining oil in high water cut stage.