Research On Polymer Flooding Crossflow Mechanism And Preventing Technology

Water flooding is the major way in oil field of China , at present, some important field has been in high water hold, water cut has raised rapidly, this require new technology to enhance recovery. Among which methods, polymer flooding is widely applied in China, it has been accomplished through plot experiment to spread period , Daqing ,Dagang,Henan,Shengli oil field have carried out polymer flooding and obtain good effect, however after long period water flooding , reservoir parameters and fluid character all have changed, although water plugging has been done , viscous finger also occurs to polymer flooding during displace process ,this lead to polymer cross flow and affect oil displacement efficiency ,oil well polymer advance output , and then water cut rapid ascend, polymer concentration is high from oil well, so it is significant to research the polymer cross flow ,through experiment and analyze , factors are analyzed by geography and techniques, sensitivity analysis also are studied, main factors are confirmed , according to experiments , microcosmic visual and long -core test and flat model are combined to study cross flow mechanism, at last, experiments results and oil field condition are optimized, and this provide base for enhance recovery.