Research On Polymer Flooding Crossflow Mechanism And Preventing Technology

WaterfloodingisthemajorwayinoilfieldofChina,at present,someimportant fieldhas been inhighwaterhold, watercut has raised rapidly,thisrequire new technology to enhance recovery. Among which methods ,polymer flooding is widely applied in China, it has been accomplishedthrough plot experiment to spread period , Daqing ,Dagang,Henan,Shenglioil fieldhave carried out polymer floodingand obtaingood effect,howeverafter long period water flooding , reservoir parameters and fluid character allhave changed, although water plugging has been done , viscous finger alsooccurs to polymer flooding during displace process ,this lead to polymercross flow and affect oil displacement efficiency ,oil well polymer advanceoutput , and then water cut rapid ascend, polymer concentration is highfrom oil well, so it is significant to research the polymer cross flow ,throughexperiment and analyze , factors are analyzed by geographyand techniques,sensitivityanalysisalsoarestudied,mainfactorsareconfirmed,accordingtoexperiments , microcosmic visual and long–core test and flat model arecombined to study cross flow mechanism, at last, experiments results andoilfieldconditionareoptimized,andthisprovidebaseforenhancerecovery.