A Study On Variable Flow Resistance Oil Displacement Method

This paper is to study the sandstone reservoir,which is using polymer,two element composite,multivariate foam flooding and so on after water flooding.The oil displacement agent viscosity is general designed by setting value or for different injecting slug to design different viscosity value.This paper puts forward a kind of oil displacement agent viscosity which changes continuously variable seepage resistance method.It explains the principle of variable seepage resistance oil displacement method.With this method the multilayer heterogeneous reservoir can format the uniformity of oil displacement front in the process of displacement of oil.Thereby it expands plane and portrait swept volume of the reservoir,and greatly improves water flooding or polymer flooding oil recovery.By using of the numerical simulation method and Eclipse software,it have built the ideal model of which to compare with variable flow resistance flooding scheme and unsteady seepage resistance scheme.The variable flow resistance scheme can achieve swept volume greatly.In the other word relative constant seepage resistance scheme can achieve higher recovery rate.We have done the indoor experiments by using of self-developed visual plane sandpack model.The results show that displacement of variable flow resistance polymer solution which conform to the change of flow resistance method and variable seepage resistance polymer + foam scheme in the plane have more affected area.By using of a glass etching model,we have done microscopic visualization experiment,variable flow resistance of polymer flooding improves 11.18%recovery value more than the relatively constant viscosity of polymer flooding.In heterogeneous reservoir which simulate by multi-core conditions,having compared of the different alternating injection sequence on the effect of the recovery.The scheme of concentration echelon reduced can achieve the highest recovery value.