Cairn submits field development plan for Rajasthan

Vol 9, PW 17 (01 Dec 05) Exploration & Production

Cairn Energy has submitted its long-awaited field development plan for the Saraswati, Rageshwari, Aishwarya and Mangala oilfields located on block RJ-ON-90/1 in the Rajasthan desert.

Delivered to the DGH on 5th October, the plan is under scrutiny and must be approved within 180 days from the date of submission. Details obtained by this report reveal that Cairn estimates the four fields together hold in-place reserves of 1.36bn barrels of which Saraswati holds 36.8m barrels, Rageshwari holds 41m barrels, Aishwarya holds 213m barrels and Mangala the companys jewel in the crown - holds in place reserves of 1.07bn barrels.

According to the development plan, Cairn plans CAPEX of $1.67bn to develop the four fields. Under DGH scrutiny is a proposal to drill 231 new wells in the four fields plus four exploration wells two each on Saraswati and Rageshwari.

At Saraswati, Cairn plans nine development wells - seven producers and two water injectors. At Rageshwari, it plans 15 development wells - all producers.

Aishwarya will see 51 development wells with 34 producers and 17 water injectors. Mangala will have 160 development wells - 105 producers and 55 water injectors.

Cairn expects plateau production of 1400 b/d or more at Saraswati; 1100 b/d or more at Rageshwari; 12,000b/d or more at Aishwarya; and 100,000 b/d or more at Mangala. First oil production from smaller fields Saraswati and Rageshwari is expected from the third quarter of 2006.

First production from Aishwarya and Managla is expected to begin sometime in the fourth quarter of 2007. According to the development plan, Cairn is expecting a recovery factor of approximately 10% from all the four fields.

It is expecting a recovery factor of 11.4% for Saraswati and 9 % for Rageshwari fields. For Aishwarya, Cairn is targeting a recovery factor of about 22% after water flooding and 31.9% after polymer injection.

For it biggest field Mangala, water flooding will result in a recovery factor of about 34.4% and polymer injection will lead to a recovery factor of about 4.37%.

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