Numerical Simulation Of Polymer Flooding Parameters Optimization And Tracking Fitting In D6 Test Area

The test area of D6 reservoir belongs to low permeability reservoir,after 30 years of development,has entered the high water cut stage,test exists many problems,such as strong heterogeneity,high degree of recovery,high water cut and so on,resulting in waterflood development efficiency becomes worse.In order to improve the production status of test block,produce remaining oil,polymer flooding project has been designed in August 2016,the block contains 36 production well and 19 injection well.Before carry out the development of polymer flooding test,the geological model has been established using the petrel software,based on the geological model,the water flooding numerical simulation model has been established,carried out the water flooding history fitting,analysis of water flooding remaining oil distribution and tapping the main parts,the water flooding remaining oil mainly in the test area was divided into three types: the top of the thick oil layer,thin layer and Injection-production is not perfect,found more than 60% of the remaining oil in the test area is mainly concentrated in the main channel,the main sheet sand and phase transition in the river which effective thickness above 1m,permeability above 150×10-3μm2,so the remaining oil enrichment area as the main object of potential.The polymer flooding numerical simulation model is used to optimize the injection parameters of polymer flooding.The concentration of polymer is 800mg/L,the injection speed is 0.15PV/a,and the total polymer dosage is 520mg/L·PV.According to the single well production and injection method to production allocation and injection of wells in the test area,the prediction of numerical simulation show that the test area of polymer flooding recovery is 49.56%,compared with the water flooding recovery increased by 7.65%.After the D6 test block started the polymer injection,collect production dynamic data of polymer flooding stage,study on numerical simulation of polymer flooding tracking,put forward measures on tapping the potential wells,including proper adjustment of the fracturing and injection parameters of the well.