The Research Of Numerical Simulation For Polymer Surfactant Flooding In Class Ⅲ Reservior In Xingerxi Block

The Class I reservoir of Xingerxi Block has a higher degree of development after polymer flooding,but Class II and III reservoirs mainly with water flooding,particularly the Class Ⅲreservoir,still have a lot of residual oil left in the underground,which are the potential for further increasing reserves and production.Therefore,how to quickly and efficiently develop Class Ⅲreservoir and improve recovery has become a problem for petroleum scientific and technical workers.Polymer Surfactant flooding as an effective method of tertiary oil recovery technology,recently achieves some results and recognition from field tests in Daqing oilfield.In order to research on polymer surfactant flooding development effect for Class Ⅲreservoir,the geological deposition feature,fluid property,development situation and so on are analyzed.And the fine geological model is established by using the Petrel software,which the permeability,porosity and effective thickness are calculated by using the phased interpolation.Based on the modeling results and production performance data,use numerical simulation to carry out the water flooding and polymer surfactant flooding tracking history matching,and then to study remaining oil distributing.Besides in the paper development plans about polymer flooding and polymer surfactant are made.By predicting development effects and evaluating economic benefit of each plan,finally select the best development plans of each flooding.Results show that the polymer and polymer surfactant flooding can be efficiently develop Class Ⅲreservoir,but the polymer surfactant flooding development effect is significantly better than polymer flooding.Compared with conventional water flooding,the recovery of experiment and centre wells blocks increases 13.86%and 15.25%respectively.Through this study we can see that for mid-low permeability reservoirs polymer surfactant flooding can effectively improve injection profile,increase the water absorption thickness and layers,reduce water cut,increase oil production obviously,and increase recovery more than 10%.This technology can provide practical basis to mid-low permeability reservoirs development.