National Oilwell, 506 W US Highway 67, Big Lake, TX 76932, US

Nabors Well Services is a division of Nabors Industries. The Nabors companies own and operate nearly 600 land-drilling sites and 970 land-workover and well-servicing rigs worldwide. Offshore, Nabors operates 44 platforms, 17 jack-ups, and three barge rigs in the domestic and international markets. Nabors markets 30 marine transportation and support vessels, primarily in the US Gulf of Mexico. In addition, Nabors manufactures top drives and drilling instrumentation systems and provides comprehensive oilfield hauling, engineering, civil construction, logistics and facilities maintenance and project management services. Nabors participates in most of the significant oil, gas and geothermal markets in the world. With more than 750 rigs, Nabors Well Services operates one of the largest and most diversified mobile rig fleets in the United States. It also offers ancillary services, which includes a fleet of more than 250 fluid transportation trucks. The company maintains operations in Big Lake, Texas.