Function: In drilling operations, fluids (usually water-based or oil-based) are pumped down the well to cool the drill bit, carry rock cuttings to the surface, and maintain pressure. Low Temperature Fluid Loss Additives (LTFLAs) are added to ensure that the fluid doesn't lose too much to the formation, especially when drilling at lower temperatures or in colder regions.
Benefit: They reduce the risk of damaging the formation by minimizing fluid loss, which can lead to wellbore instability and reduced drilling efficiency.