This is a list of oilfield service companies – notable companies that provide services to the petroleum exploration and production industry but do not typically produce petroleum. In the list, notable subsidiary companies and divisions are listed as sub-lists of their current parent companies. Definition Oilfield service companies may produce, maintain, and repair equipment used in oil extraction and oil transportation. In 2019, the global oilfield services market was US $ 267.8 billion. List Companies connected with oilfield services DeepOcean International Logging Kongsberg Gruppen Rolls-Royce Holdings Teledyne Technologies Wärtsilä See also List of oil exploration and production companies List of largest oil and gas companies by revenue References Lists of energy companies