For some time already, I have been receiving requests from friends and readers, mostly drilling engineers and well-site people, to provide a quick and fact-based tool to estimate the top of cement (and all cementing fluids) after a job. A tool that can also help during the design phase to identify where the cement (lead, […]
All you need to know about Bentonite in Cement Slurries
Let’s have a quick overview regarding bentonite. It is easy to find references online regarding bentonite as a cement extender, the way it works (or I should say reacts), and why additional water is required when using it as an extender. Here I will try to explain as simply as possible, for readers of all […]
Forward thinking reverse cementing
I recently participated in a discussion about opting for the best alternative between conventional and reverse primary cementing to deal with losses and frequent difficulties to reach the required TOC in an intermediate well section. The interesting thing in this discussion was that the majority of the participants had no experience in doing reverse cementing. […]
Mud Displacement, the ‘mystery’ factor in gas and fluids migration
Very often I find myself helping people having issues with fluids migrating following primary cementing. In all these cases, it is always fascinating to see the frequency of this problem nowadays. Especially with the involvement of expert services companies and the availability of state-of-the-art engineering and products solutions. I have already written here about fluid […]
Primary Cementing Checklist (Customer)
Now you are the person in charge of well construction operations. It is nighttime, and the company man is resting (contrary to ‘normal’ people, a co-man needs noise to properly rest, because noise means that ‘all is working’). As a junior or night well site leader you have done and seen this many times, but […]
Why wiper plugs don’t always bump?
Everybody knows why bumping the top plug at the end of the displacement is an essential element of each successful primary cement job. It ensures only the shoe track is left with cement, and; It allows the pressure testing of the casing. First of all, a couple of questions for you: What is the reason […]
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