Abstarct: In today’s world, the oil and gas industry faces numerous challenges in optimizing processes and enhancing safety. This research examines and analyzes heavyweight cements and the role of weighting materials in improving the mechanical and rheological properties of cement slurries for oil and gas wells. The primary objective of this study is to achieve the best design and formulation of heavyweight cement slurries for high-pressure exploratory and development oil and gas wells with a density of 170 PCF under high temperature and pressure (HPHT) conditions. This work has been conducted for the first time in Iran, with experiments carried out by the author, and globally, no similar achievement has been reported. In this study, New materials referred to as Weighting Agent Super Max, were utilized. The effects of each of these materials on the properties of the cement slurry were thoroughly evaluated. Various formulations of cement slurries were designed and combined using these weighting materials. Preliminary tests were conducted to investigate the rheological and mechanical behavior of the slurries. The tests included evaluating properties such as viscosity, density, setting time, compressive strength, and static gel strength loss, which were conducted under simulated different temperatures and pressures for deep oil wells. Throughout these tests, various slurry samples were examined under actual well environment conditions. The results obtained showed that the use of Weighting Agents Super Max, especially in combination, significantly increased the density and compressive strength of the cement slurries while also improving the setting time. Additionally, field tests indicated that these combinations can maintain the stability of the slurries against high pressure and temperature, thereby reducing the risk of failure in drilling pipes. baxsed on the obtained results, heavyweight cement formulations containing Weighting Agents Super Max exhibited superior properties compared to conventional compositions, making them particularly suitable for use in oil and gas wells with a density of 170 PCF under severe temperature and pressure conditions. This research also suggests that further studies should focus on optimizing these formulations with an emphasis on new additives and reducing laboratory errors. The findings of this study could contribute to improving cementing quality and enhancing safety in oil and gas drilling operations.