A novel fluid loss control agent for reducing transition time and optimizing fluid loss and rheological properties in fresh cement slurry

Fluid loss changes the slurry's rheological and mechanical properties. Thus, fluid loss proves that the slurry cannot have proper properties. This study tests several types of FLC (fluid loss control) and a liquid dispersant on fresh cement slurries. The study examined changes in several properties. These include rheological properties, compressive strength, fluid loss control, free water, settling, mixing, and thickening time. Also, fluid migration from the pumped cement is a big issue during well cementing. Excessive fluid loss can allow gas to enter the cement slurry. So, fluid loss control additives are used to reduce gas migration. The cement slurry weight was 118 pcf used in 13 3/8″ casing and 7″ liners. Materials with different functional groups were tested: amide, ester, ether, alcohol, and carboxylic acid. Finally, an FLC was made by combining two substances. They had ester and ether functional groups. The Final decision was to mix three substances. They were FLC1, FLC2, and a liquid dispersant. To control the properties of a fresh cement slurry. The target values were 180 and 210 °F for compressive strength and 150 and 180 °F for BHCT. The designed formulation using these additives leads to a reduction in transition time. Reducing transition time helps cut gas migration into the cement slurry.