Exploration technology for fractured-vuggy condensate gas reservoirs in block 9 of the Tahe Oil Field

The Ordovician fractured-vuggy condensate gas reservoirs in block 9 of the Tahe Oil Field are characterized by complex reservoir geology and complicated seepage flow law of multi-phase fluid through porous media. The gas wells have high pressure, high paraffin content, high H₂S content and high setting points. Currently, there are few mature exploration experiences and techniques for reference.After two years' practice, several methods such as open-flow potential, binomial production equation as well as divergences comparison bet-ween gas wells are used comprehensively. The reasonable gas production rate per well in fractured-vuggy condensate gas reservoirs was determined and a depressurizing development strategy was established. Meanwhile, three anti-blocking technologies involving fluid velocity optimizing, modified paraffin removal mechanical tech-nology under high pressure and positive injection of fluid slugs were proposed. Thus, the development effect on fractured-vuggy condensate gas reservoirs has been successfully improved.