Testing method and testing device for water drive pore structure change of loose core

• Main Authors: TANG YONGQIANG, LANG DONGJIANG, ZHAO CHUNPENG, CUI MAOLEI, LUN ZENGMIN, LYU CHENGYUAN, XIAO PUFU
• Format: Patent
• Language: Chinese; English
• Published: 17.09.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a testing method and a testing device for water drive pore structure change of a loose core. The testing method comprises the following steps: 1, providing a loose core sample; 2, packaging the loose core sample in a core holder; 3, heating the core sample to a required experimental temperature and enabling the core sample to reach a set annular pressure, vacuumizing the core sample and enabling the core sample to be saturated with water; 4, acquiring a first nuclear magnetic resonance T2 spectrum of the pore structure of the core sample through a nuclear magnetic resonance device; 5, performing constant-speed water displacement on saturated water in the core sample through a displacement pump, and obtaining a second nuclear magnetic resonance T2 spectrum of the pore structure of the core sample through the nuclear magnetic resonance device again after the injection amount of the water to be displaced reaches a set value; and 6, calculating the change percentage of the water-driven por