Gas reservoir irreducible water saturation determination method and device and gas reservoir movable water range determination method

• Main Authors: SU YULIANG, LI DONGSHENG, FU JINGANG, HAO YONGMAO, WANG CHENGWEI, LI LEI
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2019
• Subjects: DETECTING MASSES OR OBJECTS; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; MEASURING; PHYSICS; TESTING

The invention discloses a gas reservoir irreducible water saturation determination method and device and a gas reservoir movable water range determination method. The gas reservoir irreducible water saturation determination method comprises the steps of dividing a research area into a plurality of grids according to a preset rule and locating a target well at the center of the research area and the plurality of grids; determining the pressure, differential pressure, pressure gradient and effective stress of the grids according to distances from the grids to the target well, the current bottompressure of the target well, the original stratum pressure, the well radius and the gas drainage radius; determining a fractal dimension of capillary radius distribution, influenced by the effective stress, of the grids and a fractal dimension of capillary tortuosity, influenced by the effective stress, of the grids according to the effective stress and effective stress influence coefficients of the grids and the pore rad