Patent Number: 6,966,376

Title: Method and composition for downhole cementing

Abstract: Disclosed is a method to increase the bonding forces of a hydraulic cement to a subterranean pipe (such as a casing) by the addition of at least one cementitious expansive agent to increase the bulk volume of the cement plug and a latex. The method includes positioning a platform in a downhole pipe below the desired cement plug interval, positioning a plug dump bailer tool comprising a chamber for cement slurry and a valve to discharge the cement slurry on and above the platform, and discharging the cement slurry. The cement slurry includes an expansive agent and latex to increase the shear-bond between the downhole pipe and the cement plug.

Inventors: Vaeth; John F. (Slidell, LA), Duhon; Mark C. (Sugar Land, TX)

Assignee: Schlumberger Technology Corporation

International Classification: C04B 40/00 (20060101); C04B 40/06 (20060101); C04B 28/00 (20060101); C04B 28/02 (20060101); C09K 8/42 (20060101); E21B 033/134 ()

Expiration Date: 1/22/02018