Study On Distribution Law Of Remaining Oil In Γ North Γ3Γ4 Oil Tank In Zhanajoer Oilfield

Γ3Γ4oil section of north Γ in the zhanaroer oil field has entered the stage of low and medium water-cut after decades of water injection, with the characteristics of the decline of oil production rate, the high difficulty of steady production, the fast rising speed of water cut, the complicated oil-water relationship and the prediction trouble of the remaining oil distribution law. By October2012the reservoir recovery is only24.1%, and more than67.41million cubic meters of remaining recoverable reserves is not produced. So it is urgent to study the remaining oil distribution law and formulate reasonable well stimulation.In the paper, the reservoir numerical simulation model of Γ3Γ4oil section of north Γ is built up to study the production history matching, and fits these targets like the geological reserves, reservoir pressure, the total water cut, bottom hole pressure, single-well water cut, etc. At the same time, the logging interpretation results and production-injection profile test results are fully used to guild the parameters adjustment. According to remaining oil saturation and remaining oil reserves abundance from the history matching result, the paper puts forward four kinds of remaining oil type, in which the type of incomplete well pattern accounts for about32%, the type of interwell retention accounts for about38%, the type of fault barrier accounts for about9%and the type of interlayer interference accounts for21%.The influence mechanism research on remaining oil is carried out by setting up the typical well group mechanism model after the history matching. Then through the study on injection multiples, the research on quantitative characterization of micro injection multiples in the plane and the statistics of the relationship between the micro injection multiples and water saturation, oil saturation and recovery degree, it is possible to analyse the remaining oil distribution law and evaluate the water flooding development effect in microcosmic. At the same time, this paper summarizes the relationship between macro injection multiples and the recovery degree and the moisture content, and analyses its effect on reservoir production during diffirent stages of reservoir development. Based on the recovery degree and layer inflow, the multilayer producing mechanism model studies the influence of heterogeneity on remaining oil distribution, and analyses how to influence.Combined with the actual situation of the reservoir at present, two measures on increasing production are proposed through the researches of the numerical simulation and the influence mechanism to remaining oil. This paper use the reservoir numerical simulation technology to compare these development adjustment schemes and choose the best one.