Now, please let me tell you more about Cement gelation Why this post? Over a month ago, someone requested some insights about gelation during primary and secondary cementing. Two or three answers were provided, which I think were enough to have a good idea of the topic. However, to be honest, I could not stop […]
Successful Well Cementing
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 models and assumptions — the path of perfection. To clarify, knowing the cement bond is just part of the “outcome” […]
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 […]
As a cementer, you are required to isolate a possible influx zone at 1600m, What can you do?
Influx zone characteristics 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. They tend to get worse with additional drill string work, such as trips, reaming or circulation. […]
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