The webtier utilities installer is not included in the Portal, Forms, Reports and Discoverer (PFRD) Media. The PFRD media will install Oracle HTTP Server and Web Cache for you however.
Should you really need to have a separate Webtier installation, you need to download the 'Oracle Fusion Middleware Web Tier Utilities 11g (220.127.116.11.0)' for your platform. It is included in the FMW 18.104.22.168 media pack available on the [url https://edelivery.oracle.com]Oracle Software Cloud. Also consult the [url http://docs.oracle.com/cd/E23943_01/doc.1111/e14260/toc.htm]WebTier installation documentation, should you need further help.