Analysis on the Influence of Bridge-Type Concentric Layered Water Injection Technology on Enhanced Oil Recovery
Through the experimental device of fluid seepage and the experimental device of oil-water interface movement,different conditions of water injection pressure and rate were set,and their effects on fluid seepage characteristics and oil-water interface movement were analyzed.In addition,the multi-layer model experimental device was used to study the impact of layered water injection on layers with different permeabilities,and the recovery factors under the traditional water injection mode and the bridge-type concentric layered water injection mode were compared through the simulation experimental device.The results showed that with the increase of water injection pressure,the initial seepage rate increases from 10 mL·min-1 at 2 MPa to 30 mL·min-1 at 10 MPa.In the layered water injection experiment,the initial seepage rate of the high-permeability layer was 100 mL·min-1,and the oil production reached 462 mL,while the oil production of the low-permeability layer was only 68 mL.The crude oil production and recovery rate of the bridge concentric layered water injection mode were significantly higher than those of the traditional water injection mode,reaching 310 mL and 31.1%respectively at the end of the experiment.By optimizing the combination of water injection pressure and rate,with water injection pressure of 15 MPa and water injection rate of 150 mL·min-1,the crude oil production reached 820 mL and the recovery rate was 82.2%.The bridge-type concentric layered water injection technology significantly improved the fluid displacement efficiency of different permeability layers,reduced excessive water injection of high permeability layers,increased the degree of utilization of medium and low permeability layers,and significantly increased the overall recovery rate.
Bridge-type concentric layered water injectionRecovery factorOilOil displacementInterfaceMeasurementPermeabilityOptimized water injection strategy
万方数据
维普
