Gas injection practice and well selection of carbonate fractured-vuggy reservoirs in Tahe oil field

The carbonate reservoirs in the Tahe oil field are featured by big burial depth, strong heterogeneity and obvious reservoir space variation, and are mainly of fractured-vuggy type. With the development of oil field, energy and bottom water problems gradually become the main factors influencing natural decline. As the capacity of water drive development is declining sharply, the gas injection development which could enhance oil recovery has gradually become an important means. This paper introduced the practice of gas injection in the Tahe oil field, summarized experience and rules of gas injection development for different types, and came up with some new ideas for well selection. Some ideas and methods for improving gas drive efficiency and guiding gas development for carbonate reservoirs were proposed.