Characterization method of CO2 flooding relative permeability considering dissolution viscosity reduction effect

• Main Authors: YANG RENFENG, YANG XUGANG, SU YANCHUN, TIAN XIAOFENG, ZHANG LIJUN, TAN XIANHONG, SHU XIAOHAN, ZHAO LIN, WU JUNCHUAN
• Format: Patent
• Language: Chinese; English
• Published: 05.07.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ELECTRIC DIGITAL DATA PROCESSING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS

The invention discloses a CO2 flooding relative permeability characterization method considering a dissolution viscosity reduction effect. The method comprises the following steps: selecting a target oil field, preprocessing a rock core, recording related experimental parameters, and then establishing irreducible water saturation by a method of driving water with oil; after the oil displaces water, the core is subjected to water displacing oil by adopting an aqueous solution or gas displacing oil by adopting CO2 displacing; a CO2 relative permeability calculation method considering the dissolution viscosity reduction effect is obtained through an Arrhenius equation; calculating to obtain an oil-phase relative permeability curve and a gas-phase relative permeability curve respectively by measuring experimental data and the established oil-phase relative permeability model considering the dissolution viscosity reduction effect and the gas-phase relative permeability characterization model considering the dissol