Abstract: The present invention relates to the collection, storage, and management of global oil and gas well information obtained from multiple well data sources. In some embodiments, the invention relates to the assembly and use of a multi-level hierarchical database for storing well records, where each record stored in the database is categorized by one of a low level (e.g., well event), a middle level (e.g., wellbore), or a high level (e.g., well), such that a query for a record yields a single comprehensive result record comprising all of the stored records related to the query, from all hierarchical levels and from all of the well data sources.