Abstract: The thermal recovery technology by Steam stimulation has become the most effective method in the heavy oil reservoir, but the steam upswept region would not be effectively improved, so the heavy oil reservoir can be divided into two areas according to the reservoir fluid properties. For the steam stimulation thermal recovery well in heavy oil reservoir with double porosity media, owing to the difference of flow properties in steam sweeping region and upswept region, the problem of well testing must use radial fluid composite model. The heat loss of steam in cap rocks is considered, a radial fluid composite model is established, in which, heat loss is considered, the solution of Laplace space in the condition of infinite formation is gained, and the method of numerical inversion is used to figure out the corresponding type curves, which provide a new model for pressure behavior analyses about heavy oil reservoir.

Key words: heavy oil thermal recovery, double porosity media, well testing, heat loss, interpretation model