Study On Controlling Factors And Adjustment Technology Of Reservoir Flow Field In Jinhu Sag

Jinghu sag is the second largest oil sag in jiangsu oilfield.From the research and analysis,the subdivision encryption potential is limited,and the next step mainly depends on the change of flow field to improve the development effect.For this project on the basis of the characteristic analysis of flow field,the master control factor on the changes of flow field are analyzed,and discussed the advantage of flow field identification method,put forward the technical countermeasures of change flow field,flow field changes provides the technical support for the next step.Through research,obtained the following understanding: high water cut reservoir flow field pay more attention to the flow field of the heterogeneity and variability,from Jinghu sag reservoir heterogeneity overall evaluation results to see all kinds of heterogeneity is stronger,and part of the unit there are fracture or microfracture,further exacerbating the reservoir heterogeneity,the whole vertical heterogeneity stronger than plane;From the point of Jinghu sag flow variability,high water cut after clay mineral content fell by around 3%,the average pore throat than doubled,overall good permeability,heterogeneity coefficient increases,the heterogeneity.From the point of factors influencing the flow field analysis,the stronger the longitudinal heterogeneity,the greater the difference of the flow field distribution,low permeability layer using the worse,plane heterogeneity are main factors of controlling the movements of oil-water plane is also the main factors that control the flow field distribution.Comprehensive evaluation of the longitudinal heterogeneity,development degree and plane heterogeneity,well pattern,well type and oil/water viscosity is larger than the effect of flow field,form,and reservoir parameters such as oil-bearing belt width,stratigraphic dip is relatively small.The identification methods for the advantage flow field of small fault block reservoirs in jinghu sag mainly include dynamic correlation method,fuzzy comprehensive evaluation method and streamline simulation method.It is suitable for the technical countermeasures of changing flow field in jinghu sag,such as vector mixing of oil and water well,changing direction of fluid flow,profile control and water plugging,unstable water injection,lifting fluid,injection-production coupling,etc.Among them,the oil and water well vector allocation and the change of liquid flow direction have the greatest potential,and the suitable reserves account for about 30% of the high water-cut reserves in jinghu sag.