India's oilfield services and energy infrastructure sector features major domestic and multinational corporations providing advanced drilling, exploration, and production support. The premier market leaders include the state-owned Oil and Natural Gas Corporation (ONGC) subsidiary services, Schlumberger (SLB) India, Halliburton India, Baker Hughes, and prominent domestic private engineering firms such as Larsen & Toubro (L&T) Energy, Jindal Drilling & Industries, and Aban Offshore, which support massive onshore and offshore hydrocarbon recovery operations.