Optimized On Organic Chromium Gel/Volume Expansion Particle Combinated Flooding Adjustment System And Research On Oil Displacement Efficiency

In oilfield development strategy, more than80%of our oilfield adapted water flooding,due to the heterogeneity of reservoir, the injected water flows、dashes through the highpermeability zones or porous channels, but little water goes into the formation with lowerpermeability, In order to enhance the swept volume and oil displacement efficiency, floodingadjustment system has been applied to seal the formation with lower permeability whereasimprove the seepage ability of the formation with lower permeability, so to obtain a aequilibrium entry profile and finally enhance oil recovery. The article studies the optimizationof organic chromium gel-volume expansion particle combination flooding adjustment system,and finds the flooding adjustment system which is suitable to oilfield, so to improvedevelopment effect.This research composites common organic chromium gel and volume expansion particle,which is then mingled with oil displacement agent, to form combined flooding adjustmentsystem. Finally the sealing effect and oil displacement performance have been studied. First,organic chromium gel system and volume expansion particle are screened and evaluatedrespectively, then researches have been carried out to study the factors which influence the gelforming ability and swelling effect of volume expansion particle. Second, with no influence towater absorptivity, the article studies the influence of volume expansion particle to gelforming performance of organic chromium gel system and the influence of organic chromiumgel system to the swelling ability of volume expansion particle. So the combined floodingadjustment agent suitable to Hai1Block (reservoir with water) is: Polymer is P2, P3, P4orP5, with concentration between0.2wt%~0.25wt%; organic chromium gel agent couldprimarily be NJ-5, secondarily NJ-4, with concentration between0.1wt%~0.2wt%; volumeexpansion particle of rapid swelling is TP4~TP5, slow swelling is HP1and HP2~HP4withconcentration of0.5wt%. Third, according to comprehensive evaluation of physical andchemical performance of oil displacement agent, interfacial activity of crude oil andcapability of temperature-resist, the suitable surfactants could be32#,33#,40#withconcentration between0.05wt%~0.2wt%; at last the article studies organic chromium gelflooding system, organic chromium gel-volume expansion particle combination floodingadjustment system, sealing effect of oil displacement system in physical model and oildisplacement performance.The result shows the deep flooding adjustment formula system is: pre-slug uses0.2wt%P2＋0.15wt%NJ-5＋0.3wt%TP5, total sealing efficiency is99.49%; major sluguses0.2wt%P2＋0.15wt%NJ-5, total sealing efficiency is99.96%; oil displacementslug uses0.2wt%agent with oil displacement efficiency increased by12.21%.