Pressure controlled well test using periodically changing production and injection flow rate is experimentally being applied to geothermal reservoir characterization in Japan. Sinusoidal test is one of the standard periodical function methods. A laboratory experimental apparatus for pressure controlled well test was made, and numerical simulation for designing test rock was done. The numerical simulation was aimed for estimating the range of rock parameters effective for the experiments. Influence of permeability and porosity on amplitude attenuation and phase shift of sinusoidal pressure responses in the test rock was calculated for porous medium and MINC type fractured rock.

Numerical calculations were also done to study the pressure responses of air injection well tests, in which the feed point flow rate is not a simple function of the air injection rate. The experimental and reservoir parameter ranges for use of practical air injection tests were estimated.
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