Risk-based Management of Produced Water discharges in Oil and Gas operations





Produced water management requires a structured framework that involves multiple aspects and risks associated with it to select and justify the decision. To get the full picture regarding the potential risk of produced water management, in this project, environmental, technical, and economic risks are considered in the decision-making process. Minimal work has been conducted on integrated risk assessment of produced water and this work takes those risks into account during the decision-making process. Environmental risk assessment is conducted by DREAM, Failure Mode and Effects Analysis is used to estimate technical risk, and cost-benefit analysis is performed to calculate economic risk. To integrate all the risk values, acceptable risk levels are set and compared to the calculated risk values. Experts assign weighting factors by using pair-wise comparison. The sum of the multiplied weighting factors to the ratio of calculated-acceptable risk values gives the final integrated risk. This framework can help to examine and select the most suitable treatment or reuse technique or identify potential areas for improvement in a specific site. The integrated risk can be used as a basis to guide the decision-making process of produced water management. A case study on the produced water treatment in Thunder Horse Oil Field is presented to demonstrate the application of the proposed framework.