The Application Of Isofluidity Transfer Technology In The Polymer Flooding

In order to further excavate the remaining oil,polymer flooding has been carried out in Daqing oilfield successively,three-element compound flooding,foam flooding and other oil displacement methods,all achieved better excavation results.But there is still a large flow,(O il wells see chemical agents early,chemical breakthrough time 0.06-0.1PV),the injection dosage is large(the dosage of chemical agent is between 0.57-0.72PV)and the problems of poor production effect in low permeability reservoir.This paper addresses the above issues,in order to further improve the oil recovery rate,it also reduces the channeling,reduces the cost of chemical agents,analyzes and studies the isofluidity transfer technology.The basic idea of this technique is to achieve the goal by improving the cohesion strength,slug synchronization rate and dual synergism.An efficient oil displacement technology for heterogeneous thick oil layer is studied in this paper.It according to the reservoir heterogeneity,combination optimization more viscosity fluid displacement slug injected into the reservoir,based on the fluid flow ability difference,form a drive for reservoir is high,low and medium reservoir as a whole,greatly reduce the displacement fluid channeling delay high permeability belt.This paper proposes that this method ca n improve the recovery rate by more than 30 percentage points and increase the recovery rate by more than 20 percentage points.However,due to the fact that it has not yet entered the field test,the feasibility of the transfer technology remains to be further observed.So to carry out field test after polymer flooding,explore further improve oil recovery after polymer flooding technology,such as clear mobility displacement technology of adaptability,and strive to form a set of matching tracking adjustment technology,provide support for oilfield sustainable and stable and long-term development.