84 - An 12 Block Polymer Displacing Agent, The Flooding Mechanism And Numerical Simulation

Taking Shen84-An12 block as example and binding its geological data and formation characters, formation sensibilities including rate sensitivity, water sensitivity, salt senseitivity, acid sensitivity, alkaline sensitivity have been analysed and evaluated for the block. Based on this, eight different hyodified polymer oil displacement applying for the block have been synthesised , i.e, alkali-lignin graft acrylamide monomer, liginosulphonate graft acrylamide monomer, liginosulfonate graft polyacrylamide, AMPA-AM dibasic copolymer, hydroxymethyl-methylprone-polyacrylamide, formaldelyde crosslinked polymer, phenol formaldehyde resin prepolymer crosslinked polymer, and so on. Experimenting result of physical simulation shows that compounded modified polymer oil displacement is better than partly hydrolytic polyacrylamide in temerature resisting ability, salt resisting ability and shearing stability resisting ability. Experimenting result of core oil displacement shows that modified polyer oil displacement agents can improve oil recovery rate 2-7 percent that HPAM. By comparing experiments, it shows that taking phenol formaldehyde resin prepolymer as crosslinker ,degree of improving crosslinked polyer compounded by ther agents is bigger. Mechanism of improving oil recorery rate of modified oil displacement agents is discussed. Based on physical simulation, by soft of humerical simulation, effect of oil displacement of modified polyer oil displacement agents is being simulated by computer, it'sresult is similar to what achieved by physical simulation.