Strength retrogression preventer

Details Strength retrogression preventer Strength retrogression preventer

2005-08-19

2008-11-11

Marcantoni, Paul (Department: 1793)

Wells

Processes

Cementing, plugging or consolidating

C166S293000, C166S294000, C106S724000, C106S819000, C106S823000

Reexamination Certificate

active

07448449

ABSTRACT:
Cementitious slurries capable of controlling and/or preventing strength retrogression during the cementing of a formation contain a bismuth salt or derivative thereof. Bismuth trioxide is preferred. The cementitious slurry may further contain a density modifying agent and/or strength enhancer. The cementitious slurries of the invention are suitable for use over a broad temperature range of from about 45° F. to about 500° F.

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Answer 85 of 139 Chemical Abstracts on STN□□□□JP 06064953, Kawachi et al. (Mar. 8, 1994). abstract only.

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