Effect of Viscosity of Heavy Oil(Class-A)on Oil Recovery in SP Flooding Using Lauryl Sulphate and Gum Arabic

摘要

Chemical flooding methods are used to recover residual oil left after water flooding.Several chemical flooding processes have been used to improve recovery.Alkaline-free surfactant polymer combination flooding(SP flooding)can avoid side-effects encountered in alkali-surfactant-polymer(ASP flooding) combination flooding.As part of the ongoing research on the use of Gum Arabic as a polymer in chemical flooding in Nigeria,this paper investigates the effect of heavy oil viscosity on oil recovery during SP flooding. Improved oil recovery through SP flooding was studied by conducting linear displacement experiments using engineering grade class IV glass beads.The glass beads were treated to be strongly water wet.The viscosity of oil samples used for the different experiments ranged from 3 to 140 cp.Lauryl Sulphate and Gum Arabic were used as the surfactant and polymer respectively. Result shows that oil recovery by water flooding ranges from 15%–25%and for SP 15%–35% keeping the polymer concentration constant.Thus,increasing oil recovery can be achieved as the viscosities of oil increases.The result from this study will help develop effective methods for imple-menting SP flooding using Gum Arabic that is vastly available in Nigeria in heavy oil fields.It will give the oil industry a new option for improving oil recovery from heavy oil reservoirs. SP flooding will be handy to improve oil recoveries from many marginal oil fields in Nigeria or those that face shut-down due to uneconomic operating cost,but still contain significant amount of oil.