Patent ID: 11873712
Assignee: CHINA UNIVERSITY OF PETROLEUM—BEIJING
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 1:
2. The apparatus according to claim 1, wherein the apparatus comprises a third intermediate container, a third piston is disposed in the third intermediate container, and the third piston is configured to separate natural gas and a liquid; a gas outlet end of the third intermediate container is connected to the inlet end of the core holder, and the third intermediate container is connected to the displacement pump and the controller, respectively;
the controller is further configured to set a corresponding pressure value of the displacement pump to the initial formation pressure, so that the liquid enters the third intermediate container from a liquid inlet end of the third intermediate container to compress the natural gas inside the third intermediate container, so as to make an internal pressure of the third intermediate container reach the initial formation pressure;
the controller is further configured to control the natural gas in the third intermediate container to be injected into the core in vacuum in the core holder, and to stop the natural gas from being injected into the core saturated with the natural gas in the core holder when both a pressure at the outlet end of the core holder and a pressure at the inlet end of the core holder reach the initial formation pressure;
the controller is further configured to determine the total volume of the natural gas in the core saturated with the natural gas according to the initial formation pressure, a gas deviation factor of the natural gas, atmospheric pressure, and a pore volume of the core.