Two groups, one led by Schlumberger Ltd. (SLB) and the other Argentina's Tecpetrol, will begin work at the Shushufindi-Aguarico and Libertador-Atacapi mature oil fields with an aim to increase output and discover new reserves, Minister of Non Renewable Natural Resources Wilson Pastor said.

Ecuador state-run oil company Petroecuador late Tuesday signed 15-year contracts with both consortia, which will invest about $1.7 billion over the next five years.

Shushufindi-Aguarico produces 45,153 barrels of crude oil per day, while Libertador-Atacapi produces 16,200 barrels per day.

The contract for the Shushufindi-Aguarico field was awarded to Shushufindi S.A, a consortium consisting of Schlumberger, Tecpetrol and KKR Energy. The state will pay $30.62 per barrel of incremental oil output to the consortium.

The contract for the Libertador field was signed with Pardialiservices S.A., a consortium formed by Tecpetrol, Schlumberger, Canacol Energy Ltd and Ecuador's Serpetec. The consortium will receive a payment of $39.53 per barrel.

The payments are only for additional production.

In a statement Canacol said Wednesday they will drill 31 new development wells and work on 28 existing wells over the 15-year contract.

President Rafael Correa said during the signing ceremony late Tuesday that if the groups fail to increase output beyond the base curve established in the respective contracts, then they won't receive any payment.

According to Correa, if the drilling is successful, the size of oil reserves that can be discovered "can radically change the country's oil horizon."

In 2010 Petroecuador called on private companies interested in service contracts to boost production at Shushufindi, Libertador, Auca, Lago Agrio and Cuyabeno, which produce an average of 150,000 barrels of oil a day, or about 30% of Ecuador's national output.

No offers were received for Lago Agrio. Pastor said that Ecuador continues to negotiate with Halliburton Co. (HAL) for Auca and Cuyabeno, but talks are "difficult" because the company hasn't made a definitive financial commitment.

According to Pastor, negotiations will continue until mid-February, adding that he can't guarantee the signing of a contract with Halliburton for Auca and Cuyabeno.

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

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