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 […]
USE OF LCM THROUGH FLOAT EQUIPMENT BEFORE CEMENTING
In some cases, losses can be seen while running the casing or circulating before cementing. This opens the alternative to pump an LCM pill as a possible mitigation to lower the losses ahead of the cement job. However, based on experience with float equipment, the following actions are recommended: Always implement the equipment manufacturer recommendation […]
Was the cement job good or bad?
Well, this is the question: was the cement job good or bad? The final answer will depend on the job objectives. Were they met? In most cases, aditional information is required, like a cement evaluation log, a pressure test or even during well completion. However, some inmediate signs can give an indication if the cement […]
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