PetroVietnam Drilling & Well Service Corporation is a Vietnam-based provider of oil and gas drilling services. The Company's operation is organized under three segments, including Drilling Services segment, which leases oil rigs and performs drilling services on a contract basis; Trading segment, which distributes equipment and supplies for oil drilling businesses, and Other Services segment, which provides diversified related services, such as oil well surveying and mapping, mud logging, oil spill containment, human resources outsourcing and project management.