Abstract: Aiming at the practical situation of layered water flooding recovery in twolayer reservoir,on the basis of analyzing horizontal flow,vertical flow and choke flow,as well the mechanism of nodal analysis,nodal analysis mathematic model of layered flooding recovery system of two-layer reservoir is set up with the consideration of interactions among the layers,producers and injectors,which greatly improve the reliability of nodal analysis.Meanwhile,by means of theoretical analysis and practical calculation,the layered output,injection rate and pressure are determined,which makes the injection-withdrawal system the status of balanced production,and is meaningful and valuable to the nodal analysis of layered reservoir.

Key words: nodal analysis, layered water flooding recovery, mathematical model, IWR, flow rate