Experimental Study on the Effect of Polymer Injection Timing on Oil Displacement in Porous Media

摘要: It has been proven that polymer injection at early times is beneficial to offshore heavy oil recovery. of significant importance optimize the timing and decide residual distribution after flooding. Aiming a specific reservoir in Bohai, China, optimum investigated through laboratory experiments. The influence on displacement remaining analyzed by combining macroscopic microscopic flooding results reveal should be close water breakthrough, i.e., just before waterflooding front reaches outlet core. In addition, position analytically solved using Buckley–Leverett method verified experimental results, which supply an approach predict timing. When injected waterflood core, mobility control ability solution can reduce fraction bypassed volume waterflooding. mainly enters high permeability zone, works positively two ways. Firstly, it improves efficiency zone. Secondly, establishes flow resistance permeable zones, thus improving sweep low medium zones. However, our experiments illustrate there still large amount Therefore, necessary explore additional EOR methods recover abundant oil.