Desc:Well bore stability and borehole rules are the basic conditions for safe, high quality and fast drilling. Drilling fluids with good performances should be able to rely on the battlefield deactivation of liquid phase. Potassium formate drilling fluid has high ionic concentration, small free water, low water activity, and the introduction of porous Unstable Strata such as loose, crack development, easy to collapse, water expansion and spalling will greatly reduce the activity of its system, thus giving play to the anti-collapse effect.
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