Yousef Kazemzadeh

The cementing operations of oil and gas wells are considered one of the most important and critical stages in the drilling process, directly affecting the stability of the well and the optimal production of fluids. The selection of the appropriate type of cement and additives at this stage can significantly contribute to increasing well longevity, reducing environmental hazards, and optimizing the economic efficiency of oil and gas wells. In recent years, the use of nanoparticles has attracted much attention from researchers and industry professionals as an innovative approach to enhancing the mechanical and rheological properties of drilling cement. Nanoparticles, with their unique properties such as a high surface-to-volume ratio, can improve important characteristics such as setting time and compressive strength of the cement. Despite numerous studies examining the individual effects of nanoparticles on cement properties, there remain limited studies exploring the synergistic effects of these nanoparticles and their combinations in more complex systems . The aim of this research is to investigate the synergistic effect of silica nanoparticles, iron oxide, and gilsonite in enhancing the properties of drilling cement. Initially, the individual impact of each of these nanoparticles on the setting time and compressive strength of Class G cement was examined under standard temperature conditions of 20°C and pressure of 14.7 psi. Subsequently, using a comprehensive experimental design, 65 different scenarios of combinations of these nanoparticles with varying weight percentages were studied to determine the interaction and synergy of these materials on the properties of drilling cement. The results of this research indicated that a combination of one weight percent of nanoparticles, including 50% weight of nanosilica and 50% weight of nanogilsonite, exhibited the best performance among other combinations. This mixture significantly increased the compressive strength of