| From geological research,the reservoirs characteristics in Hong Gang Oilfield were finely described with integrating multi-discipline research of the geology,seismic,well logging,and dynamic analysis.With the single sand-body as the basic target,the fine reservoir geological model was rebuilt and the distribution of remaining oil potential was studied through oil sand connectivity researching.The potential of oil sand-body distribution and size was clarified and quantified.The adjusting units were determined.Therefore,the final decision can be determined for profile control of geological engineering integration.With the deeply understanding and analyzing reservoir characteristics,it was maked clear the main reasons of the formation of ineffective water and the direction for the further profile control was promoted.Through the fine static and dynamic reservoir analysises,the main problems of the adjusting blocks,as well as the potential of block and the direction of profile control,were determined.They can be concluded as follows:The ineffective water circulation is mainly caused by positive rhythm characteristics and cracks formed by fracturing,the dominant sand-bodies of severe heterogeneity but still abound in remaining oil areas are seeing as the main layers of profile control.The water wells located in main channels occur the water break though and in the vertical bottom of the positive rhythm are considered as the key location of profile control.Based on the analysises of the reservoir characteristics,two major problems were solved through profile control.On one hand,according to the reservoir characteristics,both sealing the water breakthrough channel and maintaining permeable capacity should be ensured.On the other hand,the oil percolation in matrix was enhanced on the basis of low permeability of sandstone matrix in dual seepage media.The system of swelling gel,nanoparticles,polymeric flocculant and molecular film oil displacing agent were optimized based on the demand of the reservoir.According to the flooded connecting thickness in the injection-production well groups,the ellipsoidal or semi-ellipsoidal volume formulae were utilized to approximate the profile control agent volume combined with the characteristics of the profile control agent system.The various construction parameters were optimized on the basis of different development or channeling characteristics in different wells and layers.The significant results were achieved through the online profile control techniques and parameters control construction. |
