Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 55 6 2023 08 23 The effect of cementing additives on the rheological properties, thickening time, and compressive strength in drilling operation The effect of cementing additives on the rheological properties, thickening time, and compressive strength in drilling operation 1219 1236 5149 10.22060/ceej.2023.21171.7640 FA MOHSEN DEHVEDAR Petroleum Department/AUT Mohammad Mahdi Hosseini MSc. Petroleum Department/AUT Journal Article 2022 03 01 Plastic viscosity (PV), yield point (YP), fluid loss volume, thickening time, and compressive strength of cement are the main parameters that are necessary for a successful operation. In this study, 25 tests were done to design different slurries and find the effect of various additives, including extenders (bentonite and sodium silicate), accelerators (calcium chloride and sodium chloride), retarders (calcium lignosulfonate and CMHEC), and fluid loss controller (FLC). Calcium chloride provides acceptable results up to 6% of the weight of cement. For more than 6%, it provides unpredictable results. The amount of sodium chloride in high concentrations (30%) also acts as a retarder. Calcium lignosulfonate slows down thickening timeless than CMHEC, while CMHEC can retard the slurry more and increase the closing time. The slurry setting time trend increases in calcium lignosulfonate almost linearly while CMHEC increases nonlinearly. addition of FLC to cement water causes water to be retained in the slurry system and this causes the increase of this additive in the slurry to increase the setting time of cement and reduce its short-term strength (24 hours). Plastic viscosity (PV), yield point (YP), fluid loss volume, thickening time, and compressive strength of cement are the main parameters that are necessary for a successful operation. In this study, 25 tests were done to design different slurries and find the effect of various additives, including extenders (bentonite and sodium silicate), accelerators (calcium chloride and sodium chloride), retarders (calcium lignosulfonate and CMHEC), and fluid loss controller (FLC). Calcium chloride provides acceptable results up to 6% of the weight of cement. For more than 6%, it provides unpredictable results. The amount of sodium chloride in high concentrations (30%) also acts as a retarder. Calcium lignosulfonate slows down thickening timeless than CMHEC, while CMHEC can retard the slurry more and increase the closing time. The slurry setting time trend increases in calcium lignosulfonate almost linearly while CMHEC increases nonlinearly. addition of FLC to cement water causes water to be retained in the slurry system and this causes the increase of this additive in the slurry to increase the setting time of cement and reduce its short-term strength (24 hours). https://ceej.aut.ac.ir/article_5149_4a3050ae2c77da4f9c90e2e58e8e520f.pdf