Ecuador's state oil company Petroecuador has extended to March 28 the deadline to submit proposals for enhanced oil recovery work in five mature fields.

Originally, Petroecuador set March 21 as a deadline for companies to deliver proposals.

The five Petroecuador oil fields--Shushufindi, Libertador, Auca, Lago Agrio and Cuyabeno--produce about 120,000 barrels of oil a day, about 26% of Ecuador's national output.

Petroecuador is seeking to boost production at its mature and older oil fields by 15% from 2012 by inviting investment.

Last year, Petroecuador said that around 10 companies are interested in the project, including Halliburton Co. (HAL), the Swiss-based Weatherford International Ltd. (WFT), Baker Hughes Inc. (BHI), Russia's Bakrie Kalila and Schlumberger Ltd. (SLB).

-By Mercedes Alvaro, Dow Jones Newswires; 5939-9728-653; mercedes.alvaro@dowjones.com
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