State-owned Oil & Natural Gas Corp. (ONGC) is delivering two gas systems for the ultra-deepwater U-Field and R-Field in the KG-DWN 98/2 Block project, Bay of Bengal, off the east coast of India. The U-Field is now connected to ONGC's Vashishtha subsea infrastructure and is producing through the U1-B (GX-06) well.
The project is being executed in a consortium including McDermott and Larsen & Toubro Hydrocarbon Engineering (L&T HE) (OGJ Online, Oct. 2, 2018). McDermott's vessels Derrick Barge 30, Derrick Lay Vessel 2000, North Ocean 102, and Lay Vessel 105 (LV105) installed hundreds of kilometers of pipeline, 60 km of umbilicals, and 16 km of flexible pipes, including the first pipe-in-pipe flowline for production in India.
All structures for KG-DWN 98/2 Cluster II development are being manufactured at L&T HE’s modular fabrication facility at Kattupalli in Tamil Nadu (LTHE-MFFK). The U-Field gas manifold was installed in water depth of 1,400 m. LTHE-MFFK also delivered SURF structures and served as a spoolbase facility for stalk fabrication and reeling of rigid pipelines, which have been installed to facilitate gas flow from the U-Field wells to the onshore terminal at Odalarevu.
The project includes 425 km of 6-22-in. pipeline, 150 km of control umbilicals, an offshore process platform able to process 6.5 million standard cu m/day of gas, and a floating production, storage, and offloading vessel to process oil and gas. Water depths are 300-1,400 m and the FPSO will be in 413 m of water. (OGJ Online, Apr. 19, 2018).
Peak production rates are estimated at 16 million standard cu m/day of natural gas and 80,000 b/d of oil.