OPSDS: a semantic data integration and service system based on domain ontology

For the distributed, heterogeneous, relational complex data sources of petroleum engineering, we present an oil production engineering semantic-based data integration system (OPSDS). OPSDS establishes a semantic data integration and service system based on domain ontology on the premise of building a global semantic model and realizing the global semantic search. The global semantic data model applied to various oil fields is set up by ontology extraction, ontology evolution, ontology combination and semantic constraints. The domain-oriented data integration to provide the data access and shared service is realized by ontology mapping, query transformation, and data cleaning. Users and upper applications can have a direct access to underlying complex data sources in times of need through the global semantic data model, and the cleaned data can be returned in a unified format. OPSDS has been realized and got extensive use in many platforms of China National Petroleum Corporation(CNPC). It has been found that the method can not only provide the comprehensive and real-time data support for oil and gas wells, but also improve the production and recovery efficiency with good application.