National Oilwell Varco, Inc. provides equipment and components for oil and gas drilling and production; oilfield services; and supply chain integration services to the upstream oil and gas industry worldwide. Its Rig Technology segment offers offshore and onshore drilling rigs; derricks; pipe lifting, racking, rotating, and assembly systems; rig instrumentation and turret mooring systems; blowout preventers; coiled tubing equipment and pressure pumping units; well workover rigs; wireline winches and trucks; cranes; flexible pipe; and other products for floating production, storage, and offloading vessels, and other offshore vessels and terminals. The company's Petroleum Services and Supplies segment provides consumable goods and services to drill, complete, remediate, and workover oil and gas wells; and service drill pipe, tubing, casing, flowlines; and other oilfield tubular goods. This segment also engages in the rental and sale of drill pipe, wired drill pipe, transfer pumps, solids control systems, drilling motors, drilling fluids, drill bits, reamers and other downhole tools, and mud pump consumables for drilling operations. In addition, it provides oilfield tubular services, such as inspection and internal coating services; equipment for drill pipe, line pipe, tubing, casing, and pipelines; and coiled tubing pipe and composite pipe. National Oilwell Varco, Inc.'s Distribution and Transmission segment provides pipe, maintenance, repair, and operating supplies and spare parts to drill site and production locations, pipeline operations, and processing plants; and procurement, materials management, and logistics services, as well as produces water transmission pipe, fabricated steel products, and specialized materials and products for infrastructure projects. This segment also serves waste water treatment, chemical, food and beverage, paper and pulp, mining, agriculture, and municipal markets. The company was founded in 1862 and is headquartered in Houston, Texas.