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O crescente desenvolvimento econ?mico mundial, seguido pelo aumento da demanda energ?tica, interligado ? depend?ncia do uso de combust?veis f?sseis, tem contribu?do para o aumento da concentra??o na atmosfera de um dos gases respons?veis pelo efeito estufa: o di?xido de carbono (CO2). Nesse contexto, a t?cnica de Recupera??o Avan?ada de Metano em Camada de Carv?o (ECBM) com inje??o de CO2 surge como uma proposta promissora para amenizar essa situa??o, pois h? concomitantemente recupera??o de metano (usado para produ??o de energia) e armazenamento de di?xido de carbono (contribuindo para mitiga??o do efeito estufa). Esse processo envolve a produ??o de ?gua, a qual cont?m in?meros ?ons dissolvidos (Na+, Ca+2, Cl-, SO4 -2) e elementos tra?o. Portanto, ? necess?rio o estudo e eventual tratamento dessa ?gua antes do descarte, pois esse ? um aspecto que pode inviabilizar a aplica??o dessa tecnologia. Experimentos laboratoriais foram realizados para observar altera??es na composi??o da ?gua de produ??o gerada durante o processo de dewatering, por inje??o de CO2. Amostras de carv?o dos estados do RS, SC e PR foram analisadas. Observou-se elevada concentra??o do ?on SO4 -2 e dos elementos Fe, Zn, Al e Ni, em rela??o ? legisla??o, assim como valores elevados de SDT (mgxL-1) para a Jazida Le?o - Buti?. Concluiu-se que h? necessidade de tratamento da ?gua recuperada em um processo de CBM/ECBM, para as Jazidas analisadas, pois os limites estabelecidos pela legisla??o para os par?metros analisados s?o extrapolados. The growing global economic development, followed by increased energy demand, interconnected on the dependence of fossil fuels, has contributed to an increased concentration of greenhouse gases in the atmosphere, mainly carbon dioxide (CO2). In this context, the Enhanced Coalbed Methane (ECBM) with CO2 injection technique, emerges as a promising proposal to alleviate this situation, because as is results in methane recovery (used for energy production) and storage of carbon dioxide (contributing to mitigating the greenhouse effect). This process involves production of formation water, which may contain numerous dissolved ions (Na+, Ca+2, Cl-, SO4-2) and trace elements. Therefore, study of this water and eventually treatment is necessary, this being one aspect that could undermine the application of this technology. Laboratory experiments were conducted to observe possible changes in the composition and properties of produced water generated during dewatering process with CO2 injection. Coal samples from the states of RS, SC and PR were analyzed. There was a high concentration of SO4-2 ions and the elements Fe, Zn, Al and Ni, in accordance with legislation, as well as high values of TDS (mgxL-1) for the field Le?o - Buti?. It was concluded that there is a need for treatment of reclaimed water in a process of CBM/ECBM, for the fields analyzed because the limits established by law for the analyzed parameters are extrapolated.