Research on Acid Gas Pollution Control of High Density Potassium Polysulfonate Water Based Drilling Fluid in Sichuan Basin
Shale gas reservoirs in the Sichuan Basin have the characteristics of deep burial,high geothermal gradient,and high gas content.The high-density potassium polysulfonate drilling fluid system has been widely used in shale gas well drilling in the Sichuan Basin due to its unique performance and has achieved excellent results.The high-density potassium polysulfonate water-based drilling fluid system itself has a high solid content and low free water content,and the means of controlling the rheological properties of the drilling fluid are limited and difficult.Due to the presence of numerous microcracks and the abundance of acidic gases in the formation of this area,the formation is easily released and dissolved in the drilling fluid during the drilling process,resulting in a deterioration of the rheological properties of the drilling fluid,an increase in its viscosity,and even inability to flow,seriously affecting drilling safety and efficiency.
potassium polysulfonatewater based drilling fluidrheologyacidic gas
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