Abstract: A drilling fluid inhibition evaluation device includes a main test member, a temperature control pressurization system, a gas source, a circulation heating system, a confining pressure pump, a central control system, a computer, an ultrasonic detector and a safety valve electrically connected through pipelines, respectively, the main test member and the temperature control pressurization system sequentially connected with the gas source; the present disclosure can pre-pressurize experimental fluid and then inject the fluid into a dilatometer, so as to prevent the fluid from generating obvious changes of phase states, eliminate pressure setting errors caused by a saturated vapor pressure of the fluid, improve accuracy of evaluation results, inspect a real expansion state of the sample and simultaneously monitor structural change characteristics of a rock sample in real time through reflection conditions of sound waves.

Abstract: The invention relates to a pressure oscillation simulation device of deep coalbed methane and a method thereof. The device includes: a box, a liquid discharge pipe arranged on a bottom portion of the box, a gas source connected to the box through a gas injection pipe, a water source connected to the box through a drainpipe that includes a branch pipe; a measuring system including a pressure measuring member and a liquidometer. The present disclosure can simulate the coalbed pressure oscillation in a coalbed gas exploitation process and be of simple structure and high reliability, and can simulate influences of the pressure oscillation on a wellbore and a stratum environment in the coalbed exploitation process to provide reliable data support for an actual coalbed exploitation; the simulation method of the present disclosure can accurately simulate the pressure oscillation of the wellbore and the stratum.