Recently, I was asked about Cementing Engineering training schools by an employee of a regional cementing company, aspiring a position as senior cementing engineer. This is not the first time I have received similar question, and they are becoming more frequent with the rise of local and regional companies elsewhere. Basically, these companies are taking […]
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 doing reverse cementing. There […]
Gas migration and surface casing vent flow issues and prevention
Please read and comment the following very intersting article written by my invited expert: Djilali Sahnoun – Technical & Engineering Manager. Many wells experience gas migration to surface through one of the following issues: a cemented casing string(s) with either a micro-annulus between casing and cement, a channel within the cement sheath, or a channel between the […]
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 the frequency of this problematic in our days, 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 […]
Mixing Energy or Shear Rate ? What is the effect on the Cement Slurry?
Back in 2016, I posted an article on laboratory testing for cement slurries. In this article I briefly referred to the changes in the preparation of the slurry in the laboratory to account for the additional mixing energy typical in small slurry volume jobs using batch-mixer, like in CT operations. In fact, it is common […]
As a cementer, you are required to isolate a possible influx zone at 1600m, What can you do?
These wells may show high dogleg severity in the intermediate section. Depending on the type of formation drilled across, there could be a tendency to form sort of keyseats, not only low side but also high side, that tend to get worst with additional drill string work, such as trips, reaming and/or circulation. By the […]
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