Additive Type Purpose Considerations Extenders IWater, Bentonite (clays), pozzolans, amorphous silica, Sodium Silicate, etc. Reduction of hydrostatic or greater economy.Lower slurry density from less than 15.8 down to 11.5 ppg, typically.Higher slurry yield (more slurry volume per sack) Change slurry rheology (viscosity). Increase porosity and consequently thickening time.Compressive strength: delay the 50-psi value, slow development […]
Workover Cementing Techniques. (3) Plug Cementing
Continuing with these series of posts covering some of the cementing techniques applicable in workover operations, I want to talk further about plug cementing. In previous posts, I have covered extensively plug cementing. This time I am providing information regarding laboratory testing and some considerations when cement plugs intended for well abandonment. Cement Slurry Properties […]
Cement Slurry Mix Design Decision Tree
The optimal cement slurry mix design principle There is a principle that I have always come to appreciate when talking about designing cement slurries. This principle is easy to remember: ‘the simpler, the better’. In this context, this means the use of the less possible additives, in their lowest effective concentration, that can provide the […]
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