Patent ID: 9611722
Date: 2017-04-04
CPC Classifications: E21B

Claim:
1. A top down cementing method for a tubular string to be supported from an existing string at a subterranean location, comprising: positioning the tubular string relative to said existing string with a top down cementing running tool; configuring said cementing running tool with an external barrier and at least one bore internally; setting said external barrier; delivering a sealing material laterally out of said cementing running tool on a downhole side of said set external barrier to flow down toward a fluid return port; taking displaced fluid returns from said fluid return port and expelling said fluid laterally out of said cementing running tool on an uphole side of said set external barrier; releasing said external barrier; securing said tubular string to said existing string through said bore independently of said external barrier; removing said cement running tool with said external barrier from said tubular string.