Abstract: In well test analysis, many well test physical models are often used, including homogeneous, dual-media, composite reservoir model etc. User or software development engineer used to separately solve each practical problem based on different models, but the efficiency was very low. Aiming at ternary media composite reservoir, the effective well-radius model of the ternary media, composite reservoir was established in the paper. The Laplace solution under bottom-hole pressure was obtained with the Laplace transformation, and then the well test interpretation model was unified through simplifying and decomposing. The model almost included all the models in well test interpretation (except for the horizontal well).

Key words: model, well test interpretation, bottom hole pressure