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This part of ISO 13503 provides consistent methodology for measuring the fluid loss of completion fluids under dynamic conditions. This part of ISO 13503 is applicable to all completion fluids except those that react with porous media. For Germany, Working Group NA 109-00-01-03 AK "Bohrspülung und Zemente - Spiegelausschuss zu ISO/TC 67/SC 3" ("Drilling and completion fluids, and well cements - Mirror Committee of ISO/TC 67/SC 3") of the Petroleum and Natural Gas Industries Standards Committee (NÖG) at DIN, the German Institute for Standardisation e. V., has participated in the preparation of this standard.