Squeeze cementing is basically a filtration process that occurs during the placement of the cement slurry into a wellbore entry point (casing leak, existing perforations, etc.) under sufficient differential pressure. The cement slurry is held in place until it cures and establishes a hydraulic seal. Look at this picture in Squeeze Cementing Principles explaining the […]
Workover Cementing Techniques. (1) The Injectivity test
This injectivity test page is the start of a series of posts covering cementing techniques applicable during workover, including specific job requirements, fluid characteristics, and testing procedures. We will cover each of the following job categories: Remedial cementing, well abandonment, and fluids control/shut-off. I am initiating this series of posts, (you can find links to […]
Cement gelation: Come on! move it! push it! … Too late, it’s gelled up! …
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 […]
Horizontal or highly deviated well section abandonment?
This is a guide for those who are facing plugging and abandonment challenges of a horizontal or deviated welI. To be honest, it is only recently that I had the opportunity to place frequent cement plugs in such conditions and for good purpose. Yes, I did those only occasionally before … However, “frequency” is important, […]
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” […]
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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