The case of unawareness Vs. understanding What are the consequences of knowing the outcome of your cement job? Most people would say, that knowing the outcome allows the connection of execution and design with job model and assumptions — the path of perfection. Just to clarify, knowing the cement bond is just part of the […]
In need of Cementing Engineering Training?
Recently, someone asked me about cementing engineering training schools by an employee of a regional cementing company. This person was aspiring towards a position as a senior cementing engineer. The rise of regional companies The interest from this cementing company employee was not the first time I have received a similar question. They are becoming […]
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. […]
Gas migration and surface casing vent flow (SCVF) issues and prevention
Please read and comment on the following fascinating article about SCVF problems written by my invited expert: Djilali Sahnoun – Technical & Engineering Manager. Many wells experience surface casing vent flow (SCVF) and subsequent gas migration to the surface through one of the following issues: a cemented casing string(s) with either a micro-annulus between casing and cement, a […]
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 […]
Mixing Energy or Shear Rate? The effect on 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 a batch-mixer. (Like in coiled tubing/CT operations). A typical use […]
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