Vol 3, PW 6 (14 Apr 99) Exploration & Production

Internal notes prepared by Gaffney Cline & Associates (GCA) for ONGC suggest the reservoir consultants are not having an easy time finding a solution to the problem of declining production at the Bombay High, Indias biggest oilfield producing 230,000 barrels a day (b/d).

In its Monthly Report For February, 1999 prepared for ONGC, GCA admits that initial results have not been satisfactory in the application of a 19 layer simulation model to test the reservoir, and that more work is needed by ONGCs Institute of Reservoir Studies (IRS) at Ahmedabad. GCA adds that use of remedial technologies such as signal enhancement or increased digital sampling of input logs are not commercially available for the existing log data base forcing GCA to rely on ONGCs existing core data, with disappointing results.

What is clear is that GCA is making good use of data acquired and processed by PGS reservoir. The current ECLIPSE model of the LIII reservoir in Bombay High North is now being modified to reflect the faulting identified by PGS in its analysis of the 3D data set.

The note calls on ONGC to set up a multi-disciplinary team including representatives from Engineers India Ltd to investigate and quantify opportunities for reduction in pipeline costs. It also raises doubts as to the load bearing capacity of existing Bombay High platforms and the increasingly severe problem of corrosion failure in water injection pipelines.

The note praises the regular fortnightly meetings of ONGCs multi-disciplinary teams to discuss improvements at the Bombay High and neighbouring Heera fields but insists another ISDN line is needed to improve the quality of video-conferencing facilities between GCA and ONGC.

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