Bayphase identifies FDP inaccuracies at 98/2

Vol 19, PW 9 (14 Jan 16) Exploration & Production

You would think ONGC was extremely careful when preparing its $6bn Field Development Plan (FDP) for the prestigious KG-DWN-98/2 deepwater block.

Apparently not. The DGH insisted on getting the FDP checked by external UK-based consultant Bayphase and it seems the plan is riddled with inaccuracies.

Bayphase delivered a presentation on the discrepancies to ONGC and the DGH during a series of meetings in Noida from December 8-10. Under scrutiny were the petrophysical models or procedures used to interpret wireline log data to characterise the reservoir.

Bayphase complained ONGC's porosity model for the DWN-M1 or Padmawati discovery, drilled to 1757 metres vertical depth and sidetracked from 1318 metres to 2722 metres, is too high. Bayphase also found discrepancies in the property maps of static and dynamic models for the M3 discovery at the Padmawati field.

This was resolved after ONGC presented a new petrophysical model for the well on December 10, 2015. Next the porosity for two discoveries in the Kanakadurga field, G-2-2 and G-2-P1, was found to be too high.

Well G-2-2 was drilled to 3657 metres. Bayphase pointed out shortcomings in the static models of the A2, A1, G-2-2, M1 and M3 fields which will be used for future reservoir prediction and to generate production profiles.

ONGC promised to provide a revised dynamic model for A2 and a further review of the static models for the A1 and M1 fields.