Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F. 

Form 20-F ___X___ Form 40-F _______

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes _______ No___X____

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Petrobras files suit against the ANP

(Rio de Janeiro, September 14, 2007). – PETRÓLEO BRASILEIRO S/A -PETROBRAS, [Bovespa: PETR3/PETR4, NYSE: PBR/PBRA, Latibex: XPBR/XPBRA, BCBA: APBR/APBRA], a Brazilian international energy company, announces that it filed an ordinary suit against the National Petroleum Agency (ANP) today seeking to have its rights to assess and possibly develop and produce the discovery it made via well 1-BRSA-230-RJS acknowledged.

The area the discovery was made in is contained in Block C-M 273, which the ANP intends to include in the list of blocks to be offered in its 9th Round of Bidding, the public notice for which is expected to be published next September 18. The above-mentioned discoverer well started being drilled in the exploration phase for the Concession Agreement for Block BC-400, and the ANP’s technical area itself clarified to the Agency’s Collegial Board, via a Technical Note, that acknowledging the rights for the discovery’s assessment is in line with the industry’s best practices.

Therefore, the Petroleum Law, which requires the best industry practices be observed, would be severely breached if the ANP’s decision to not acknowledge Petrobras’ rights to assess the discovery prevails. Additionally, the rights to the discovery made in the well, the drilling for which was commenced in the exploration phase, are a counterpart both for the risks Petrobras incurred and for the high investments it made while undertaking the work. Therefore, Petrobras, aiming at defending its shareholders’ interests, filed the suit seeking to have its rights for the discovery that was made acknowledged.

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   www.petrobras.com.br/ri/english
Contacts: PETRÓLEO BRASILEIRO S. A. – PETROBRAS
Investor Relations Department I E-mail: petroinvest@petrobras.com.br
Av. República do Chile, 65 – 22^nd floor - 20031-912 - Rio de Janeiro, RJ I Tel.: 55 (21) 3224-1510 / 9947

This document may contain forecasts that merely reflect the expectations of the Company’s management. Such terms as “anticipate”, “believe”, “expect”, “forecast”, “intend”, “plan”, “project”, “seek”, “should”, along with similar or analogous expressions, are used to identify such forecasts. These predictions evidently involve risks and uncertainties, whether foreseen or not by the Company. Therefore, the future results of operations may differ from current expectations, and readers must not base their expectations exclusively on the information presented herein.

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This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates offuture economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.

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