Experimental study on constant pressure of polymer flooding in second-class reservoirs

At present, the second-class oil layer has become main polymer flooding replacement in Lamadian Oilfield. The low permeability, connectivity and serious heterogeneity. results of laboratory experiments are quite different from field effect. Polysystem design provides better guidance. Based on theoretical data analysis, this paper adopts constant pressure injection method. After experimental fluid is seepage through a 1.5m long core, core experiment carried out, that is, problem excessive rise controlled, so closer to layer. state injected system. was used establish matching relationship between system layers with which effectively guided on-site indoor generally adopt speed mode, without controlling pressure. However, due influence other factors, increases greatly, reservoir water absorption difficult, leads great difference In order make actual guide scheme, it urgent optimize improve