Upstream oil regulator DGH has refused to review the commerciality of India's deepest gas discovery made by Oil and Natural Gas Corp (ONGC) on grounds that developing the find poses technological challenges.
ONGC plans to invest Rs 21,528.10 crore to develop the ultra deepsea UD-1 discovery in its Bay of Bengal block KG- DWN-98/2 (KG-D5) by 2022-23. The find would have helped double the output from the KG block.
It had earlier this year submitted to the Directorate General of Hydrocarbons (DGH) for approval a declaration of commerciality (DoC) of UD-1 find, sources with direct knowledge of the development said.
DGH, however, refused to review the DoC on grounds there was no technology available to produce gas from such water depths, they said.
ONGC plans to drill nine wells on the discovery that lies in water depths of 2,400-3,200 metres and will produce a peak output of 19 million standard cubic metres per day.
UD-1 holds some 75 billion cubic meters of in place reserves.
The official said that there are consultants who have shown to ONGC that discoveries deeper than UD-1 have been put to production in recent times, particularly in the Gulf of Mexico.
"An expression of interest (EoI) meeting we had earlier this year for developing the KG finds saw several consultants offering solutions for such water depths," he said.
ONGC is in the process of appointing a consultant who will assist in developing the UD-1 discovery.
The 7,294.6 sq km deepsea KG-D5 block, which sits next to Reliance Industries' flagging KG-D6 fields, has been broadly categorised into Northern Discovery Area (NDA - 3,800.6 sq km) and Southern Discovery Area (SDA - 3,494 sq km).
The NDA has 11 oil and gas discoveries while SDA has the nation's only ultra-deepsea gas find of UD-1. These finds have been clubbed into three groups - Cluster-1, Cluster-II and Cluster-III.
Last year, the company finalised a Rs 34,012 crore (USD 5.076.37 billion) plan for developing the Cluster-II finds by 2019-20. First gas production is envisaged by June 2019 and oil would start flowing from March 2020, he said.
From Cluster-II, a peak oil output of 77,305 barrels per day is envisaged within two years of start of production. Gas output is slated to peak to 16.56 million standard cubic metres per day by end-2021.
The official said that Cluster-1 field will be developed at an additional investment of Rs 4,259.59 crore and will produce about 3 mmscmd of gas.
Cluster-2A mainly comprises oil finds of A2, P1, M3, M1 and G-2-2 in NDA which can produce 77,305 bpd (3.86 million tonnes per annum) and 3.81 mmscmd of gas.
Cluster 2B, which is made up of four gas finds -- R1, U3, U1, and A1 in NDA -- envisages a peak output of 12.75 mmscmd of gas.
Peak output is likely to last seven years, he said.