Low solubility of reservoir gases in well construction fluids is important for well control purposes. Changes in volume and density as a consequence of a gas influx can have severe consequences. The solubility of typical reservoir gases in formate brines has been shown to be very low, and significantly lower than in water-based and oil-based muds. This section of the manual presents measured solubility data for methane (CH₄) and carbon dioxide (CO₂) in a blended cesium / potassium formate brine as a function of temperature and pressure.

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