Study of Polymer Flooding in Heterogeneous Porous Media by Using Nuclear Magnetic Resonance

Polymer has been successfully used to enhance crude oil recovery at high water cut stage. However, the application of polymer flooding is limited by heterogeneity reservoir. In this work, role in heterogeneous reservoir was explored nuclear magnetic resonance (NMR) spectroscopy. Parallel core displacement experiments were carried out study formation. The results showed that area related permeability and pore connectivity. At end stage, residual not evenly distributed porous media. percent increased with increase diameter. Crude from cores larger pores higher, broke through highly permeable first. After 0.3 PV injection, mobility decreased. injection a dual effect, an effect traction effect. responsible for driving large pores, whereas small pores. 1 solution channeled rapidly. washed completely. NMR water-phase spectrum line much higher than low core. Under different porosity, peak oil-phase indicated mainly effective on > 40 μm.