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 […]
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 […]
Actions to prevent Cement Slurry Contamination in Primary Cementing (Liners)
This post provides aditional information and more detail to fluids intermixing in Liner Cementing and rheology in primary cementing What are the concecuences? Poor Cement Log Evaluation. –Cement log evaluation showing poor cement in Liner jobs (typically 7” or less) more commonly ranging 3,000 to 4,500 mts depth and/or with cement slurry volumes ranging 30 to […]
Rheology: the key to cement coverage
One of the most important things we, as cementers, must understand is rheology. In our line of business, Rheology is the key to cement coverage and zonal isolation; the solely goal of well cementing. However, as simple as this true can be, it is amazing how easily it is underestimated and sometimes totally ignored in […]
What is expected in a well cementing proposal?
Job objectives: the main aims or goals of the cement job. Background information: the major challenges and concerns. Especially any adverse experience on offset wells, best practices and lessons learned. The job method and design, e.g., 2 stage, inner string, top and bottom plug, reverse circulation, TOC, WOC, etc. How is the job method allowing […]
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