The Chemical Flooding Further Enhances Oil Recovery Method Research After Polymer Flooding

Our　country　has　a　large　amount　of　petroleum　reserves,　but　after　the　primary　and　secondary　recovery,　most　reservoirs　entered　a　high　water　cut　period.　With　oil　well　water　rising　economy　benefit　of　oil　explortation　is　worse　.This　brings　an　insistent　demand　to　find　a　new　effective　way　in　producing　oil　which　we　now　call　"tertiary　recover　technology　",for　example　chemistry　flooding,thermal　recovery,in　situ　biological　process　etc.　After　years　of　researches,　chemical　flooding,　especially　polymer　flooding,　has　been　accepted　gradually　by　most　 reservoir　engineers　in　our　country,　and　developed　into　an　effective　tertiary　recovery　technology　which　adapts　to　our　own　situation.　Polymer　flooding　has　been　expanded　in　the　big　area　of　the　daqing　oil-field,　becoming　the　important　measure　keeping　the　oil-field　sustained　development,　and　still　extends.　After　large-scale　polymer　flooding　industrialization　application,　however,　it　follows　to　also　appear　some　problems.In　some　area　polymer　flooding　has　always　reached　the　follow-up　water　flooding　stage　.after　polymer　flooding,　how　to　further　enhance　oil　recovery　and　keep　the　oil-field　sustained　development　is　important.　Through　the　indoor　physics　imitating　experiment,　this　topic　carries　on　that　after　polymer　flooding　the　chemical　flooding　further　enhances　oil　recovery　method　research.,mainly　including　after　polymer　flooding　the　low　alkali　compound　system　flooding,　changing　wettability　of　rock　entranced　oil　recovery　and　high　elasticity　polymers　flooding　etc　methods　research.The　experiment　shows　the　low　alkali　compound　system　flooding　residual　oil　remaining　oil　after　polymer　flooding　can　acquire　the　very　good　result,　and　on　the　contridition　that　wettability　is　same　the　AOS　two　component　foam　compound　system　flooding　the　oil　result　is　the　best,　and　also　get　after　polymer　flooding　high　flexibility　branch　chain　polymer　flooding　also　can　further　entrance　oil　recovery　.　This　text　mainly　studies　after　polymer　flooding　how　to　further　entrance　oil　recovery,and　aims　to　research　beyond　and　provide　the　technique　storage　for　the　further　entranced　oil　recovery　after　polymer　flooding.It　can　have　the　great　significance　to　keep　the　daqing　oil-field.　continuted　development.