Method for measuring CO2 flooding relative permeability of high-temperature and high-pressure pre-saturated live oil

• Main Authors: YANG RENFENG, YANG XUGANG, SU YANCHUN, TIAN XIAOFENG, ZHANG LIJUN, TAN XIANHONG, SHU XIAOHAN, ZOU GUODONG, ZHANG WENBO
• Format: Patent
• Language: Chinese; English
• Published: 05.07.2024
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS; TESTING

The invention discloses a method for measuring CO2 flooding relative permeability of high-temperature and high-pressure pre-saturated live oil. The method comprises the following steps: preparing live oil for a target oil field, and measuring the dissolved amount of CO2 in an oil-water mixture under different pressure conditions; cO2-live oil pre-saturation is carried out, then oil displacing water is carried out, the displacement speed is gradually increased until no water is discharged, irreducible water saturation is established, 2PV oil is displaced, and the accumulated water volume displaced from a rock core is calculated as the saturated oil volume; after displacing water with oil, respectively displacing oil with water by adopting an aqueous solution and displacing oil with gas by adopting CO2; and after the displacement pressure difference curve is stable, when the water content or the gas content of the produced liquid collected within the time interval of greater than 2.0 PV is greater than 99.5%, e