The list of oilfield service companies includes companies that provide services to the petroleum exploration and production industry but that do not typically produce petroleum themselves. Given the many mergers and acquisitions that have occurred in this sector, acquired companies are listed as sub-lists of their (current) parent companies, as nearly as articles.

• Aibel
• Aker Solutions
• Baker Hughes
• Baker International
• Bentec GmbH
• Bergen Oilfield Services
• Hughes Tool Company
• Western Atlas (renamed to Baker Atlas)
• BJ Services
• Cambridge Petroleum Software
• Calfrac Well Services
• Cameron
• Ceca specialty chemicals
• CGGVeritas
• Challenger LTD
• Clariant
• Compagnie Générale de Géophysique
• Cyntech
• Dresser Industries
• Expro Group
• Fairfield Industries
• FMC Technologies
• Fluor Corp.
• Fugro
• Frac Tech Services, Ltd.
• Fritz Industries, Inc. (formerly Fritz Chemical Company)
• Geokinetics Inc.
• Geophysical Service Incorporated
• Geosteering LLC
• Global Logistics
• Gyrodata Incorporated
• Halliburton
• Hub City Industries
• International Logging Inc. (Inter-Log)
• ION Geophysical (formerly Input/Output)
• J&L Supply Co.
• Key Energy Services
• Kodiak Coil Tubing
• Moody International Group
• Morton Electric, Inc. (435-789-6959)
• MTech Industries
• Nabors Industries (Nabors Production Services)
• Northstar Drillstem Testers (Drill stem testing services, DST)
• Nova Drilling Technologies
• OilMax Energy Pvt Ltd
• Packers Plus
• Pathfinder Security Services
• Petrotrim Services, 281-785-8897
• Petroleum Geo-Services (PGS)
• Petrolcomet Services Co.
• PetroTiger
• Phoenix Geophysics
• Plexus Ocean Systems
• Precision Drilling Corporation
• Pure Energy Services
• Qserv
• Rough Riders Services
• Rough Riders Communications
• Sander Geophysics [1]
• Sanjel Corporation
• Savanna Energy
• Schlumberger Limited
• Seaboard International
• ShawCor Ltd
• Smith International
• Superior Well Services
• T3 Energy Services
• Tangent Environmental Technologies
• Tanjung Offshore Services
• Teletec
• Tesco Corporation
• Tracerco
• TOMCO Group of Companies
• Transocean
• Trican Well Service Ltd
• Trinidad Energy Services
• Tyco Thermal Controls
• National Oilwell Varco
  • Varco
• Veco Corp
• VelcocityManager
• GE VetcoGray
• Weatherford International
• WellDynamics
• Welltec
• WesternGeco
  • Geco-Prakla
  • Western Geophysical
  • Geophysical Service Incorporated
• Wood Group
• Worleyparsons
• Zenith Oilfield Technology Limited