Abstract: A streamline numerical well-testing interpretation model for horizontal wells is developed based on the percolation characteristics of horizontal wells, including two mathematical models, one is the percolation mathematical model for the production period and the other is streamline mathematical model for the testing period. In both of the models, the different flow shapes in wellbores of horizontal wells can be taken into consideration besides the influence of factors such as reservoir heterogeneity, production history, wateroil two-phase flow, complex well pattern and complex boundary, etc. Reservoir parameters can be obtained by solving the model with streamline method and using well test auto-matching method based on genetic algorithm. A new well test interpretation method for horizontal wells is formed suitable for medium-high water cut stage reservoirs. The pressure response characteristics of streamline numerical well-testing interpretation model for horizontal wells is achieved by calculating an ideal inverted five-spot horizontal well reservoirs model associating with the streamline distribution configuration analysis. Streamline numerical well testing interpretation software is developed. The case study indicates the practicability of the software and the model.

Key words: horizontal well, streamline, well test, pressure, genetic algorithm