The invention discloses a non-linear associated
water soluble quadripolymer as well as a preparation method and use thereof, comprising: adding 20 parts of
acrylamide, 1-20 parts of nionic
monomer or / and cationic
monomer, 0.1-15 parts of
macromonomer, 0.05-10 parts of
hydrophobic monomer, 0.1-50 parts of surfactant and 60-1000 parts of deionized water to a three-necked reaction flask, adjusting the pH to be 3-9, adding 0.002-1 part of initiator (persulphate) at 30-75 DEG C after introducing N2 for 30min, reacting for 8-36h to obtain the quadripolymer PACH, diluting with water, and obtaining concentrated PACH solution. The
macromonomer with a
long chain and the
hydrophobic monomer with a molecular association function are simultaneously introduced in a
copolymer PACH, which can obtain the best synergistic viscosifying between rigid conformation of a molecular chain and molecular association and
salt resistance. The non-linear associated
water soluble quadripolymer is obtained. The
copolymer is prepared into
aqueous solution with the
mass concentration of 0.2-3g / l and the surfactant concentration of 0.01-2mmol / l, added to a mixing vessel with a stirring device and evenly stirred at the
room temperature to obtain a viscosified, salt-resistant and shear-resistant
polymer oil displacement agent. The PACH has dual functions of a viscosifier and a high molecular surfactant; minute amount of a low molecular surfactant is added to the PACH solution, thus improving the
apparent viscosity of the solution, reducing the
surface tension of solution and the water-oil interfacial tension, and being beneficial to improving the
crude oil recovery ratio. A
copolymer PABE is prepared into the
aqueous solution with the
mass concentration of 0.05-7% to obtain high molecular surfactant with excellent surface activity, and the high molecular surfactant is used as an emulsifier, a
demulsifier, a solubilizer and a
wetting agent.