| The authors have established strict formulation
of mathematical equations for permeability
determination by transient pulse method and
extended the formulation to the specified
cases, i. e., the authors have applied the
transient pulse method to the hollow cylinder
specimen and extended it's application to
the case where fluid leakage from the pressure
cell is taken into account. In the hollow
cylinder specimen, fluid leakage along specimen
boundary can be easily prevented. Intrinsic permeability k was given by the following formula:  where a is the value to be determined from test data, ,k is fluid compressibility, m is fluid viscosity, R0, Ri and L are the outer radius, the inner radius and the height of the hollow cylinder specimen, respectively. V1 and V2 are capacity of the spaces communicating with the inside and the outside of the hollow cylinder specimen in the pressure cell. The authors developed a simple apparatus for permeability measurement. Pneumatic permeability tests using the apparatus were carried out and the permeability of a specimen made of limestone was determined. The permeability test takes only a few hours even for a specimen made of low-permeability rock because of low viscosity of air. |
| KEY WORDS: Mathematical Formulation, Permeability Test, Transient Pulse Method, Hollow Cylinder Specimen. Pneumatic Test |