Shelf Drilling wins India contract May 5, 2021 8:31:am Summary The comapny will deploy the Trident XII jack-up rig for operations in Mumbai High, offshore west India. by: Shardul Sharma Posted in: Shelf Drilling wins India contract Offshore drilling contractor Shelf Drilling has been awarded a three-year contract by Indian state-run explorer ONGC, it said on May 5. Shelf will deploy the Trident XII jack-up rig for operations in Mumbai High, offshore west India. The planned start-up of operations is Q4 2021, the company said. The Mumbai High, formerly called the Bombay High, is an offshore oil and gas field 176 km off the west coast of the city of Mumbai, in the Gulf of Cambay region of India, in about 75 m of water.