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Chemical industries are among the process industries and cause many risks. The present research aimed to analyze the health risks of a chemical warehouse of drilling rigs chemical Supply Company based on COSHH (Control of Substances Hazardous to Health), CHEM-SAM (Chemical Risk Management Self-Assessment Model), and SQRA (Subjective Quantified Risk Assessment) methods in 2021. The information was collected based on document review, MSDS of chemicals, processes, employees, and chemical exposure. Flammability, toxicity, allergy-causing, corrosivity, reactivity, LD50, and permissible thresholds of chemicals were also collected. The present research results showed that out of 59 main chemicals in the operational processes of the chemical warehouse of drilling rigs, 14 chemicals are flammable, 22 cause allergy responses, and three can cause death if inhaled. According to the results of the CHEM-SAM method, the employees and people outside the organization are at medium and low chemical risk based on the current management of the chemical warehouse, respectively. The results of the COSHH health assessment showed that chemicals had low, medium, high, and very high risk in 31, 13, 12, and 3 cases, respectively. The high-risk cases consisted of Ammonium Nitrate، Caustic Soda, and Poly.Aluminum.Chloride. Health risk assessment was also performed using the SQRA method, and results showed that chemicals have a very low, low, medium, high, and very high risk in 27, 12, 8, 9, and 3 cases, respectively. The results showed that the adverse health effects of chemical exposure in the drilling industry are alarming. Employees of different sectors of oil and gas industries are exposed to chemicals.

Background: Chemical industries are among the process industries and have many risks that can lead to catastrophic and irreparable consequences. The current research analyzed the health risk of chemicals in a company supplying chemicals to drilling rigs using WASPAS and SQRA methods in 2022. Methods: The basic information of the materials used was collected based on intuitive methods, document review, MSDS of chemicals, processes, efficiency, and exposure to chemicals. In the SQRA risk assessment, hazard rate (HR) and exposure rate (ER) factors were calculated based on information related to acute toxicity, LD50, and LC50. The developed version of WASPAS-IVIF has been used to prioritize the health risk of chemicals. 10 process safety experts were used for scoring. Risk assessment calculations were done in the Excel2016 software environment, and the data fuzzification process was in Fuzzy Toolbox in the Matbal2019a software environment. Findings: The results of the health risk assessment of chemicals using the SQRA method, out of 45 chemicals, 34 were evaluated as having no health risk potential. The health risk level for Acetone, Calcium Chloride, CITRIC ACID, Fuel Oil, and Naphthalene is low. For biocide, n-Butyl, ammonium nitrate, and xylenes are at medium level, toluene at a high level, and Benzene at a very high level. The results of the WASPAS-IVIF evaluation also show that Benzene is the most critical risk factor in the chemical storage of drilling fluids, with a coefficient of 0.828. Conclusion: This research showed that the health effects caused by exposure to chemicals used in the drilling industry are worrying.