Brazilian ¨Official Passport¨

I have a Brazilian passport that expires on October 2015 and I have a travel to China to attend a conference on September 2015. I have already visited PRC using this passport and no Visa was required. My question is if I can use this passport to this time (I will stay one week in Beijing and would leave China before the expiration date of my ¨official passport¨). I also have a ¨normal Brazilian passport¨ which is valid until 2020.