The invention discloses a high-temperature and high-pressure
rock core testing device and method and application. The device comprises a
pressure control mechanism, a drainage mechanism, a heating device, an observation device and a
rock core accommodating bin, the core accommodating bin is suitable for accommodating cores; the drainage mechanism is suitable for inputting liquid into the
rock core accommodating bin; the
pressure control mechanism comprises an oil cylinder, a
hydraulic pump, a hydraulic source, an energy accumulator and a
gas cylinder; a
piston is arranged in the oil cylinder, and the
hydraulic pump can pump hydraulic oil into the oil cylinder to push the
piston to pressurize the interior of the rock core accommodating bin; an air bag is arranged in the energy accumulator, the air bag is communicated with the air
bottle, the energy accumulator is communicated with the oil cylinder, air in the air
bottle can be introduced into the air bag so that hydraulic oil in the energy accumulator can be discharged into the oil cylinder, and the air in the air bag can be discharged so that the hydraulic oil in the oil cylinder can be sucked into the energy accumulator. The device comprehensively utilizes the advantages of high
oil pressure pressurization speed and
high air pressure regulation precision, the target pressure intensity is quickly and accurately achieved, and the high-temperature and high-pressure environment where the rock core is located is efficiently simulated.