The invention provides a gas
reservoir water layer
water body mobility prediction device and method and a controller, and the device comprises a
rock core holder which is provided with a first space and a second space; the first space is used for placing a to-be-predicted
rock sample; the second space surrounds the first space; a confining pressure pump is used for applying confining pressure to the
rock sample to be predicted by injecting pressure into the second space; a high-
pressure injection pump is used for injecting the simulated
formation water in the intermediate container into the
rock core holder; a
back pressure pump is used for injecting pressure into the
rock core holder; a controller is used for controlling the high-
pressure injection pump and the back-pressure pump to pressurize the two ends of the rock core holder after the confining pressure reaches a preset confining pressure value; and when the pressure at the two ends reaches the stratum pressure set value and doesnot change, the high-
pressure injection pump is controlled to be closed, the
back pressure pump is controlled to reduce the pressure, and the water mobility is predicted according to the water yieldunder each pressure drop value. According to the scheme, quantitative prediction of the mobility of the
water body of the
water layer in the gas reservoir development process is achieved, and important guiding significance is achieved for gas reservoir development.