Methods of preventing well cement stress failure

Details Methods of preventing well cement stress failure Methods of preventing well cement stress failure

1996-01-31

1997-12-09

Gibson, Sharon

Earth boring, well treating, and oil field chemistry

Well treating

Contains inorganic component other than water or clay

507202, 507254, 507261, 166293, E21B 3314

Patent

active

056960590

ABSTRACT:
Improved methods of cementing in a well are provided whereby stress failures in the resulting set cement are prevented or reduced. The methods basically comprise the steps of placing a foamed cement composition in a zone in the well to be cemented which when set has sufficient elastic properties to resist stress failure comprised of hydraulic cement, water, a gas present in an amount in the range of from about 5% to about 75% by volume of the cement composition and a foaming agent, and then allowing the cement composition to set across the zone.

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