Thick oil huff and puff deep channel blocking system and injection method thereof

The invention provides a thick oil huff and puff deep channel blocking system and an injection method thereof. Solidification channel blocking agent composed of sodium and soil aqueous solution with the mass fraction of 4.0% to 6.0% and cement slurry with the mass fraction of 4.0% to 6.0% is adopted in a near wellbore zone, wherein the volume ratio of the two solutions is (0.8 to 1.2) : 1; temperature resistance supermolecule channel blocking agent composed of HPAM (polyacrylamide) aqueous solution with the mass fraction of 4.0% to 6.0% and phenolic resin aqueous solution with the mass fraction of 1.0% to 1.4% is adopted in a transition zone, wherein the volume ratio of the two solutions is (0.8 to 1.2) : 1; and temperature sensitive polymer aqueous solution with the mass fraction of 2.0%to 4.0% is taken as thermal thixotropic channel blocking agent in a far wellbore zone. According to the invention, steam channeling of large porous channels is blocked with the solidification channelblocking agent and the temperature resistance supermolecule channel blocking agent, and steam channeling generated by fine slits is blocked with the thermal thixotropic channel blocking agent, so that the purpose of deep channel blocking is achieved through combined blocking of the blocking agents.