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Plains Marketing is a subsidiary of Plains All American Pipeline, a master limited partnership engaged in interstate and intrastate crude oil transportation. The company also gathers, markets and stores crude oil, as well as markets and stores liquefied petroleum gas and other petroleum products. Plains All American Pipeline has a 50 percent ownership in PAA/Vulcan Gas Storage, which develops and operates a variety of natural gas storage facilities. It is one of the largest independent midstream crude oil companies in North America. The company handles more than 3 million barrels per day of physical crude oil through a network of assets throughout the United States and Canada. Plains Marketing maintains a location in Houston.

Nexen Energy Holdings USA Inc is a Houston-based company that operates in the energy sector, focusing on various aspects of oil and gas exploration, production, and development. With a strategic presence in the heart of the energy industry, Nexen Energy Holdings USA Inc plays a role in the global energy market through its operations and investments. Generated from their business information

Nabors Drilling USA is one of the largest drilling contractors in the United States, with a total fleet of nearly 400 land rigs. Nabors has achieved this position through a continuous program of investment and strategic acquisition, which began more than 10 years ago. The company is a subsidiary of Nabors Industries, which owns and operates nearly 600 land drilling and 970 land workover and well servicing rigs throughout the world. Offshore, Nabors operates more than 40 platforms, 17 jack-ups and three barge rigs in the domestic and international markets. It also markets 30 marine transportation and support vessels, primarily in the Gulf of Mexico. Nabors Drilling USA has a location in Houston.