Effect of pH of Synthetic Solution on the Performance of the Fluid Loss Control Additive Used in Oil Well Cement.

The retarding side effect and the compatibility with other additives are the main problem to limit the field application of the fluid loss control additive (FLCA) synthesized. The effect of the pH of the synthetic solution, and the type of carboxylic acid group on the retarding side effect and the compatibility with the retarder AMPS-IA synthesized by 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and itaconic acid (IA), and the influence mechanism was studied in this paper. The pH value of the synthetic solution has a significant impact on the performance of fluid loss agents containing different carboxylic acid groups. For fluid loss control additive containing maleic acid (MA), as the pH value of the synthesized solution gradually increases, the compatibility between the fluid loss agent and the retarder gradually deteriorates, but the side effects of the retarder gradually decrease. For water loss agents containing IA, as the pH value of the synthesized solution gradually increases, the compatibility between the fluid loss agent and the retarder first improves and then gradually deteriorates. The compatibility is best at pH 7, but the side effects of the retarder gradually decrease. For fluid loss agents containing acrylic acid (AA), as the pH value of the synthesized solution gradually increases, the compatibility between the fluid loss agent and the retarder first deteriorates and then gradually improves. The compatibility is best at pH 12. Overall, the fluid loss control additive containing MA has the best compatibility with the retarder, and the side effects of the retarder are not strong, resulting in the best overall performance. [ABSTRACT FROM AUTHOR]