NexTier Oilfield Solutions Inc (NexTier), formerly Keane Group Inc, is a provider of integrated well completion services. Its services include horizontal and vertical fracturing, engineered solutions, wireline perforation and logging, and cementing, pumping services, and other value-added services. NexTier also offers engineering software and technical guidance that help customers to optimize their wells. It provides onshore well development and stimulation operations for existing wells to oil and exploration and production companies. The company operates in major unconventional oil and natural gas basins in the US, including the Marcellus Shale/Utica Shale, Permian Basin, the Bakken Formation, and the Eagle Ford Formation. NexTier is headquartered in Houston, Texas, the US.