Impact Factors Analysis of Buildup Well Test in Low Permeability Reservoir

Abstract

With low permeability reservoir into the scale of development, well test gets further attention and application. But in the field application, well test interpretation model, interpretation methods of choice still exist more problems in low permeability and extra-low permeability reservoir. In this paper, with low permeability reservoir build-up well test process, we established mathematical model of the low permeability reservoir build-up well test, and deduce the analytical solution of the mathematical model. Using the deduced theoretical formula, analyze the impact factors. The results of the study show that: well storage coefficient, inner zone permeability and outer zone permeability are sensitive factors; skin coefficient is not sensitive factors.