Due to a recent resurgence in foamed cement utilization, there is a need for an additive that can provide adequate set retardation without affecting the foam characteristics of the cement system. This paper details the development of a foamed cement retarder comprising a blend of lignosulfonate, kraft lignin and a pentose sugar. Laboratory studies have shown that the performance of this product exceeds that of conventional set retarders with regard to maintaining the stability of the foamed cement system. This set retarder can also function in non-foamed applications. Several wells have been successfully completed using this new technology and case histories will be provided.

Keywords:
cement slurry, lignosulfonate, slurry, foamed cement system, kraft lignin, foamed slurry, strength, portland cement, casing and cementing, foamed cement slurry
Subjects:
Drilling Fluids and Materials, Casing and Cementing, Cement formulation (chemistry, properties)
Copyright 2003, Society of Petroleum Engineers
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