Abstract: A well test interpretation model for reservoirs with dual porosity pressure-sensitive medium is developed, which takes fractural permeability decreasing exponentially with drawdown into consideration. The wellbore storage and skin factor effects are calculated using fully implicit finite-difference form. The influences of dimensionless permeability modulus and skin factor on pressure response are discussed. The results show that the dimensionless permeability modulus will cause the increases of pressure and pressure derivative rather than the skin factor. The theory is applied to Tahe oilfield and an oil well tested twice is interpreted by it. The case study indicates that the theory has a good practicability and a consistency with field conditions.

Key words: Tahe oilfield, pressure-sensitive medium, well test interpretation, application