抄録
It has been studied to develop a apparatus for analysis of core, in which permeability, porosity, and other physical properties could be measured under high confining pressure simulated deep reservoir condition.
In this apparatus, the confining pressure was applied to a maximum value of 500kg/cm2 and internal fluid pressure could be kept in constant to common used value of 350kg/cm2 by two pressure regulators. The pressure difference of both sides of core was measured by electrical transmitters of Rosemount Eng. Co. The flow rates of gas were measured by soap film meter.
In the results of these experiments the following relation was observed between permeability and effective stress of each core. When confining pressure was much higher than fluid pressure, the permeability reductions were propotional to the confining pressure. On the other hand, after the fluid pressures reached to a value of about 200kg/cm2 in effective stress, the permeability increased and its value might be twice compared with original one.
These results have implied that permeability was not only a function of effective strese but also depended on fluid pressure in core.
