To be able to install wine on Enterprise linux you will have to make use of EPEL (Extra Packages for Enterprise Linux). You can find more information on EPEL on the fedore website.
"Extra Packages for Enterprise Linux (or EPEL) is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL).
EPEL packages are usually based on their Fedora counterparts and will never conflict with or replace packages in the base Enterprise Linux distributions. EPEL uses much of the same infrastructure as Fedora, including buildsystem, bugzilla instance, updates manager, mirror manager and more."
You will have to install the EPEL rpm, update the yum repository list and then install wine. Below is a example of the steps needed. This might change depending on the version of Oracle Linux and your processor architecture however based upon the below you will have enough to get you started;
rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm yum repolist yum install wine