Methods of preventing well cement stress failure

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

E - Fixed Constructions

21

B

E21B 33/13 (2006.01) B01F 17/00 (2006.01) C04B 7/52 (2006.01) C04B 28/04 (2006.01) C04B 38/10 (2006.01) C09K 8/46 (2006.01)

Patent

CA 2196371

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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