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We introduce Wiisu, an assistant based on Large Language Models (LLMs) specifically designed for oil and gas exploration. Wiisu offers an interface that allows users to ask open-ended questions in natural language about various internal databases of an oil and gas company. Its goal is to assist managers and stakeholders in obtaining timely, well-founded, and cost-effective answers to their data inquiries. Unlike traditional models that depend solely on extensive training, Wiisu utilizes prompt engineering and database adaptation to improve its relevance and accuracy. Furthermore, we implement an agentic architecture to carry out tasks: a disambiguation agent addresses and resolves ambiguous questions, while a Structured Query Language (SQL) agent converts the clarified questions into SQL queries to extract data from relational databases. Evaluations conducted with 19 stakeholders confirmed Wiisu’s usefulness, accuracy, and effectiveness.