Jul 17: The timelines for completion of the projects are as under:
8Hand over and transfer of Tapti facilities: January 2016
8Installation of platforms and laying of pipelines: April 2016
8Carrying out of modifications at the Hazira Plant: January 2017
8Drilling and completion of wells: March 2019
8Start of production from first well: April 2016

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ONGC's Tapti-Daman block-I: Part of produced gas to be routed to Hazira complex for processing

ONGC is planning to monetize the gas discoveries which are coming up as part of its offshore Daman development project.
8A peak production of 8.5 mmscmd (with upside potential 10 mmscmd, if gas fromadditional development of C-24 and d B-12 fields is taken into consideration) is expected from the project. Then again, if the gas from the existing C-Series fields (C-24 Cluster) is considered, the total production is estimated to go up to around 13-14 mmscmd.
8In order to monetize the discoveries as soon as possible, the E&P major has decided to route a part of the produced gas and associated condensate from the Tapti-Daman block to its Hazira Gas Processing plant at Surat, Gujarat.
8However, this will require modifications in the existing process facilities at Hazira.
8The installed facilities at the Hazira processing complex have been designed to process 52.5 MMSCMD of gas and 12,600 Sm3/day of condensate. The complex currently processes sour gas and associated condensate from the 8South Bassein Field which is ferried through the SBHT line. Along with this, gas from the PMT fields is also processed at the Hazira facilities.
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ONGC's Tapti-Daman block-II: IOGPT roped in to suggest changes at the existing Hazira facilities

An adequacy study of the existing facilities at the Hazira Gas Processing Complex (HGPC) has been carried out by the Institute of Oil & Gas Production Technology (IOGPT) which has suggested certain modifications in the existing plant. Studies conducted at the complex suggested that receipt of black condensate from new fields is likely to disturbed the operations of various downstream units such as the Condensate Fractionation Unit (CFU) and the Kerosene Recover Unit (KRU) leading to inferior product quality.
The following changes have been suggested:
8Condensate Fractionation Unit (CFU)
--It has been proposed to install two horizontal surge vessels for water knock out followed by activated carbon and cartridge filter systems at the inlet of CFUs.
--The upgraded CFU will be able to handle 6722 m3/day of condensate. It will also ensure processing of clean condensate feed in CFUs and also for improving the quality of downstream products.
8Kerosene Recovery Unit (KRU)
--Adequacy study revealed that the required diesel quality cannot be achieved by processing the naphtha column bottom liquid in the existing kerosene column.
Accordingly, two processing options have been worked out by the IOGPT:
--Processing of the entire (4287 m3/day) natural gas liquids (NGL) generated from the CFU in the existing naphtha column of the KRU and then routing of the 920 m3/day of the naphtha column bottom liquid to a new Atmospheric Steam Distillation Column (ASDC).
--Processing of the entire NGL generated from the CFUs in the new ASDC.
8No changes have been suggested in the Gas Sweetening Unit (GSU), the Gas Dehydration Unit (GDU), the Dew Point Depression Unit (DPD) and the Liquefied Petroleum Gas (LPG) plant.


ONGC`s Tapti-Daman Block-III: E&P major to utilize Tapti JV infrastructure

While a part of the produced gas and associated condensate from the Tapti-Daman block is being planned to be taken to the Hazira Gas Processing plant for processing, ONGC has already made plans to take the remaining production (C-Series gas) to the Tapti JV facilities for processing.
8Approval for taking the gas to the Tapti JV facilities for processing is however yet to be approved by the ministry.
8Readers will recall thatONGC has decided to take over the TCPP and TPP platforms from the Tapti JV (where ONGC has a 40% stake and BG and RIL hold 30% each) so that the facilities can be used for processing the additional gas that would be produced from the company`s Tapti-Daman Block or the Daman Development project.
8As the Tapti gas fields have experienced a steep decline in their output, production is likely to cease by the third quarter of 2015, and as per Tapti PSC, the equipment and assets which are no longer required for petroleum operations need to be first offered free of cost to the government or its nominee. The facilities come free of cost as they have already been cost recovered by the JV.
8It was on DGH`s request that ONGC evaluated the option of taking over the Tapti JV facilities for production and processing of gas from its C-series discoveries and agreed to take over only the TCPP and TPP platform facilities.
8Along with the two platform facilities, the E&P major will also take over two spur lines (18" and 20") connected to the South Bassein Hazira Trunk (SBHT) lines (42" and 36") for the Daman development project, subject to the understanding that the abandonment and site restoration of balance facilities (wells, unmanned platforms and infield pipelines within the field which ONGC is not taking over) will be carried out by the PMT JV and adequate funds would be transferred to ONGC that would be required to abandon the facilities which ONGC is taking over.


ONGC's Tapti-Daman block-IV: First gas can flow by April 2016

The timelines for completion of the projects are as under:
8Hand over and transfer of Tapti facilities: January 2016
8Installation of platforms and laying of pipelines: April 2016
8Carrying out of modifications at the Hazira Plant: January 2017
8Drilling and completion of wells: March 2019
8Start of production from first well: April 2016

ONGC's Tapti-Daman block-V: Details of existing facilities at Hazira Gas Processing Complex

The website carries here, for reference purpsoes, details of facilities which are currently being used at the Hazira Gas Processing Complex.
8Gas Sweetening Unit: Installed cpacity 52.5 MMSCMD (Operating capacity 46.9 MMSCMD)
8Sulphur Recovery Unit: 1.06 MMSCMD (0.88 MMSCMD)
8Condensate Fractioning Unit: 12600 M3/day (10800 M3/day)
8Gas Dehydration Unit: 47.3 MMSCMD (41.7 MMSCMD)
8Dew Point Depression: 51.0 MMSCMD (45.5 MMSCMD)
8Liquefied Petroleum Gas Plant: 5.27 MMSCMD, 960 m3/day
8Kerosene Recovery Unit: 3972 MT/day

ONGC's Tapti-Daman block-VI: GIIP estimated at 153 BCM

In the Tapti Daman bock of Mumbai Offshore Basin several marginal gas fields are discovered. The Gas initial in place of ONGC fields in nomination blocks in Tapti Daman Block (as on April 1, 2014) are 152.6 BCM (66.72 BCM in Proved Category, 36.54 BCM in Probable Category and 49.33 BCM in Possible Category).
8The C-Series and B-12 fields are being developed in different phases. While the C- 24 Cluster Development project is on production, the C-26 Cluster Development project is currently under implementation.
8ONGC is in the process of acquiring land at Kelwa-Mahim, Palghar (Maharashtra) for setting up a new onshore terminal for processing gas from the Daman Development Project.
8Not only this, if the production from the nearby fields is taken into consideration, the total production will go much higher. The expected production potential from the nearby fields is estimated at: B-12-17 (1.5-2.0 MMSCMD), CA&SD (1.0 MMSCMD), B-9-1&3 (1.0 MMSCMD), Block MB-OSN-2005/1 (4-5 MMSCMD) and C-37, NMT and C-23 (0.5-0.6 MMSCMD).
8These fields are expected to be developed in the next phase around 2020, based on the detailed reservoir characterization.