Khosro Rahimi - M.Sc. Reservoir engineering, Xegate company in Switzerland
Hasan YektaParast - M.Sc. Chemical engineering, Islamic Azad University, Chemical Engineering Department

In this paper, we perform dynamic imbibition simulations on a large scale heterogeneous fractured block.The purpose is to seek optimum conditions under which maximum oil can be recovered in large-scaleextremely-heterogeneous reservoirs. In this paper, we only consider horizontal wells. However, wesimulate both continuous and slug injection scenarios. Various chemical solutions are injected. Theseinclude: water, polymer, surfactant, alkali, and different combinations of them. For convenience ofsimulation, although this is not physically correct, alkali represents the wettability modifying agent, whilethe surfactant is the agent that lowers the IFT to ultra-low values. Therefore, a simulation labeled ASindicates that the injected chemical solution lowers the IFT to ultra-low values as well as alters thewettability from mixed-wet to water-wet. On the other hand, a simulation labeled ASP does the abovetask as well as making the chemical solution viscous (polymer). The recovery curves are compared andappropriate profiles are demonstrated in order to understand the results.

Chemical-enhanced, ASP flood, Surfactant, Static, Dynamic. Imbibition Test.