In the past weeks, I received some requests to include cement job processes or procedures, as reference material, into the website; and I was puzzled about the best way to do that without going into too much detail. Finally, I have come up with a generic flowchart for my two favorite high-level process: 1) The […]
Cementing. Challenges across permeable zones
In previous posts, I have already talked about the effect of formation permeability on the apparent cement presence behind casing, as seen on cement logs – Excellent cement job, but with terrible results … how is this possible? – Keeping in mind that the dominant factor is the loss of filtrate to the formation, as presented in A […]
Forensic Cementing
Forensic is a term associated with “crimes.” Properly, it is the use of science to investigate a crime, but how is this applicable to Well Cementing? Notably, even if some well-cementing failures could easily be considered a “crime,” because of their effect on people, the environment, assets, and companies’ finances. The objective is to thoroughly […]
Cement Slurry design Basics
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 […]
Remedial Cementing with Coiled Tubing (animation)
Far from being an animation expert, in my training courses, I always wanted to show my students a video with the complete sequence of the CT cementing process. Now I finally had the time and “patience” to make one. This will be part of a full post on remedial cementing with Coiled Tubing, but now […]
Webinar series (III). P&A (Spanish)
I am very happy to present here a webinar series on well cementing for my Spanish-speaking readers. This time from a good friend and former colleague, an expert in well cementing from my Mexico days, now a well-known professional in the Americas. Mr. Diego Florez. This third webinar is on Plug and Abandonment Please enjoy […]
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