API RP 10B-4 2nd Edition (R2026)

Current Reaffirmation
Preparation and Testing of Foamed Cement Formulations at Atmospheric Pressure

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API RP 10B-4 2nd Edition (R2026)
API Recommended Practice 10B-4, the laboratory team prepared an unfoamed Class G base cement slurry combined with a specialized surfactant stabilizer, then blended it at atmospheric pressure using a high-shear container to incorporate air and simulate a target downhole nitrogen foam quality. Subsequent testing of the resulting foamed slurry verified that the slurry density, rheological profile, fluid loss, and atmospheric free fluid/stability met design criteria, ensuring the gas phase remained uniformly dispersed without destructive bubble coalescence or premature gas migration prior to setting.
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