If we consider the main variables to ensure proper mud in hole replacement with cement: stand-off, fluids rheology (friction pressure hierarchy) and placement regime (as related to pumping rate); the amount of cement left in the hole (cement coverage), if no losses, quickly reduces (leading to increase cement returns, either to surface or above the […]
Cementing. Challenges across permeable zones
This article will provide you with some actionable suggestions for cementing 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. (See: Excellent cement job, but with terrible results … how is this possible?) Keep in mind that […]
Cement Slurry design Basics
First, here is a handy table to simplify the process of cement slurry design: 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 […]
Webinar series (II). Quality Assurance in Cementing Operations (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 second webinar is about Quality Assurance in Cementing […]
Webinar series (I). Log interpretation (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. The first webinar is on Log Interpretation. Please enjoy and […]
Excellent cement job, but with terrible results … how is this possible?
We all want to achieve an excellent cement job every time, we pride ourselves in achieving this. can face a common challenge while attempting zonal isolation during primary cementing: the resulting lack of “good bond” – as measured with cement logs – across permeable zones. This is typically seen as a sudden decrease in cement […]
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