Environment-friendly method for viscosity reduction and cold production of thickened oil

• Main Authors: LI SHUFENG, LI CHUAN, ZHANG SHUXIA, FANG HAIQIU, WEN PING
• Format: Patent
• Language: Chinese; English
• Published: 15.03.2022
• Subjects: ADHESIVES; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES

The invention discloses an environment-friendly thick oil viscosity reduction cold production method which comprises the following steps that S1, a hydraulic vibration source is installed in an oil well, and the installation depth of the hydraulic vibration source corresponds to the depth of an oil layer; s2, liquid carbon dioxide is injected into the oil well, and preliminary viscosity reduction is conducted on the underground thickened oil; s3, the hydraulic vibration source is started to generate continuous hydraulic oscillation pulse flow, meanwhile, a viscosity reducer is injected into the oil well, and the viscosity reducer is prepared from, by weight, 1%-6% of polymethacrylate, 40%-50% of surfactant and the balance water; and S4, the well is soaked, the hydraulic vibration source is taken out, and oil pumping operation is recovered. The viscosity reducer adopted by the method has very strong dispersing and stabilizing effects on the thickened oil, and the viscosity reduction rate of the thickened oil i