The invention provides a hyperbranched
polymer oil-displacing agent and a preparation method thereof. The hyperbranched
polymer oil-displacing agent is formed by a spherical parent
nucleus and a
polyacrylamide chain segment, a
sodium polyacrylate
chain segment and a poly amphoteric multi-claw
dewatering functional
chain segment which are connected in sequence, wherein, one end of the
polyacrylamide chain segment is connected to the spherical parent
nucleus, and the other end of the
polyacrylamide chain segment is connected to the
sodium polyacrylate chain segment. The poly amphoteric multi-claw
dewatering functional chain segment is formed by
polymerization of acrylic
betaine monomer or acrylic
bromine quaternary ammonium salt
monomer. The
viscosity average molecular weight of the hyperbranched
polymer oil-displacing agent is 3.5 to 10 millions, and
mass ratio of the spherical parent
nucleus to the polyacrylamide chain segment to the
sodium polyacrylate chain segment to the poly amphoteric multi-claw
dewatering functional chain segment is 1:200-350:60-85:6-14 in sequence. The hyperbranched polymer oil-displacing agent is obtained by
polymerization of a water phase radical solution, and a preparation process has mild conditions, simple steps, environment friendliness without
pollutant and can obtain products of a series of molecular weights. The obtained hyperbranched polymer oil-displacing agent has higher anti-shear capability, higher tackifying capability, well
solubility and anti-salt capability and has an oil gas field application prospect.