Study On Polymer Flooding Of Class ? Reservoir Remaining Oil Potential And Injection Parameter Optimization Of Block B

In recent years,Daqing Oilfield conducted experiments about Low-permeability oil layer and first-class oil layer sewage mixed with salt-resistant polymer flooding,Achieved a good effect of increasing oil and precipitation,However,salt-resistant polymer flooding has not yet been carried out.In order to further improve the efficiency of polymer flooding and reduce the amount of polymer diluted in sewage,carry out salt-resistant polymer flooding in s Block B of Sazhong Development Zone,to explore the development effect of salt-resistant polymer flooding in sewage system.The design of polymer flooding in Class B reservoir in Block B,based on the enhancement of fine geological research,relying on the permeability molecular weight and concentration plates established in laboratory experiments and the results of mine research,refer to the salt-resistant polymer test and industrial polymer flooding With mature experience,the design scheme has various geological influence factors from the whole area to the single well and single layer,from the injection well to the well group to connect the oil well,optimize the overall injection parameter design,and personalize the adjustment parameters of the single well injection parameter to achieve the optimal solution compliance rate and The goal of maximizing recovery factor.Class ? reservoir injection system of Block B,Sazhong Development Zone is sewage dilution salt-resistant polymer system prepared by clean water.The main purpose of the pre-plug is to regulate the high permeability layer,using high-salt and mid-salt resistance polymers,The injection rate is 0.10?0.11PV/a,the average injection concentration is 1300mg/L?1400mg / L,the wellhead injection viscosity is 50 m Pa·s,and the injection pore volume is 0.05?0.06PV;The main purpose of displacing the slug is to expand the swept volume and displace middle and low permeability layers,useing mid-point salt-resistant polymer,The injection rate is 0.12?0.13PV/a,the average injection concentration is 1150 mg/L,and the injection viscosity at the wellhead is 40 m Pa·s.The injection volume of the whole area is expected to be 1.0PV,and the converted polymer dosage is 1200mg/L·PV.Based on dynamic changes in development and production,adjust the injection parameters of the polymer system during the polymerization process.Forecast based on class ? reservoir development indicators of Block B,Sazhong Development Zone,when 0.33 PV was injected,the water content dropped to the lowest point of 85.7%,the recovery degree in the polymer injection stage was 15.82%,the final recovery rate was 59.12%,and the recovery rate was increased by 13.15 percentage points.The article can guide the analysis of remaining oil in the second-class upper-return block,and optimize the injection parameter design of salt-resistant polymer flooding to improve the development effect of polymer flooding,increase development efficiency and final recovery factor.