Two participants failed to fulfill reference terms and a third exceeded the budget.
The Mexican company's use of specialty chemicals on oil wells has been approved by the country's state oil firm.
Opposition congress member calls for an increase in taxes on gasoline and diesel, in addition to energy efficiency measures across the country.
Brazil's oil and gas market has been adding new small and mid-sized producers, such as Dimensional Engenharia, which has decided to include in its portfolio the Vale do Quiricó field, in the Recôncavo basin. Company director Vinicius Benevides spoke about the plans for the mature field.