Company shares, already battered by the company's various setbacks, were trading down nearly 14% Monday on Brazil's Bovespa exchange after the company said late Friday it had also failed to find oil at Murombe-1, the second of three offshore wildcats off the African nation.

HRT said it had signed an updated agreement with Erickson Air-Crane worth up to $40 million for the sale of its air logistics business, including six helicopters, in light of a "reduced work programme" in Brazil's remote Solimoes basin.

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