Research and application of composite gel combination profile control technology
For medium and high water cut oilfield with good reservoir property,conventional gel profile control was only used for plugging the high permeability channel near the well due to its poor fluidity.Therefore,it was impossible to seal the injection well in order to extend the sweep.Although the conventional self generating profile control was easy to flow,it can not exert the maximum effect of foam because of its limited expansion capability.Therefore,starting from the self ignition in the layer,a new design idea of inner layer self gel+gel combination profile control was put forward.The purpose of enhancing oil recovery was to use gel to block underground high permeable channel,use underground foam to plug secondary high permeability layer,increase injection pressure and increase efficiency indirectly.The laboratory test and field application showed that the effect of oil production in single well was significant,which has a good effect on oil recovery in the middle and high water cut period.
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