I am having a problem similar to this one. However, the only answer suggested there doesn't work for me.
Specifically I am trying to upgrade from VS2010 to VS2013. I have an oracle database project (.oradbproj file type) as part of our main solution and it isn't recognized in 2013. I have ODAC 11.2.0 installed on the computer and I also tried to fix the problem by re-installing it after I installed VS2013. So far, nothign has worked.
Any Ideas?
Edit, Additional information: I have noticed that I am also missing the "Oracle Database Project" project template. I believe this was added to VS2010 by the ODAC, but it is not appearing in VS2013.
The solution that I found is to install Oracle Developer Tools for Visual Studio v. 12c.
--Jacob