Abstract:

The thermal recovery technology by Steam injection has become the most effective methods for the heavy oil reservoir, after steam injection, the oil viscosity in steam sweeping region can obviously be reduced and which improves the conditions of flow through porous media around the well, but the nonswept region would not be effectively improved. Adopting the composite model in which, the inner region is regarded as heat loss and outer region as nonNewtonian PowerLaw fluid, the solution of Laplace space can be obtained in the condition of infinite formation, and the method of numerical inversion is used to figure out the corresponding type curves and the corresponding sensitive analysis made, the new type curve is different from the conventional compound reservoir's under the nonNewtonian flow influence, and the radial flow section of outside is no longer the general horizontal straightline portion, on the intersection, as a result of the condensation coefficient influence, the pressure derivative obviously falls , the bigger the condensation coefficient is, the more the pressure derivative falls seriously. These provide a new model for pressure behavior analyses of heavy oil reservoir.

Key words: heavy oil thermal recovery, Non Newtonian flow, well testing, heat loss, interpretation model