Pore space pressure constant system under simulated reservoir conditions

The utility model relates to the field of perforation efficiency detection devices under simulated conditions of oil gas wells, in particular to a pore space pressure constant system under simulated reservoir conditions, which comprises a reservoir core sample assembly and a high pressure stabilizing system. The reservoir core sample assembly includes three groups arranged in parallel, one ends in parallel are connected with a pressure pipeline end of a pore space, the other ends in parallel are connected with the upper end of the high pressure stabilizing system, and the upper end of the high pressure stabilizing system is connected with a pressurizing device. The pore space pressure constant system under the simulated reservoir conditions is simple in structure, reasonable in design, convenient in use and capable of having functions of expanding the pore space of a simulated reservoir, stabilizing pressure of the pore space and providing guarantee for accurate detection of efficiency of core flowability.