On 28 June 2018, the ANP approved of the transfer of 100% working interest from former operator Proen Projetos, Engenharia, Comercio e Montagem in the Rio do Carmo production concession to Phoenix Empreendimentos Ltda. Â Phoenix is now operator and holds 100% working interest in the onshore Potiguar Basin contract.Â  Proen is currently going through the Brazilian bankruptcy process.  On 23 March 2010, the ANP granted ProenEngenharia e Manutencao a 46-day extension to the appraisal phase for the 1.2 sq km Rio do Carmo production concession in the Potiguar Basin. No other details were available, though the Brazilian oilfield services company has been trying to revitalize the field since December 2006.   On 4 December 2006, the ANP granted an official award of the Rio do Carmo production concession to Proen from the 2nd ANP Marginal Fields Tender Round.
Proen Projetos tranfered 50% op. WI in the Rio do Carmo (100%) production concession to Phoenix Empreendimentos