Cementing subterranean zones using cement compositions containing biodegradable dispersants

US6953090B2 · kind B2 · utility

Assignees

• Halliburton Energy Services, Inc. · US
• Degussa Construction Polymers GmbH · DE

Inventors

• Jan Pieter Vijn · Leiderdorp, NL
• Christian Spindler · Günzburg, DE
• Gregor Keilhofer · Tacherting, DE
• Johann Plank · Kelheim, DE

Key dates

• Filing date: Nov 17, 2003
• Grant date: Oct 11, 2005
• Expiry date: Nov 17, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B24/32
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Methods of cementing subterranean zones using cement compositions containing biogradable dispersants are provided. The methods are basically comprised of the steps of preparing a hydraulic cement, a biodegradable dispersant comprised of polyaspartic acid containing side chains formed by reacting one or more side chain chemicals with said polyaspartic acid and sufficient water to form a pumpable slurry, placing the cement composition into a zone to be cemented and allowing the cement composition to set into an impermeable solid mass therein.